WO2025135642A1 - Electrode device and control method therefor - Google Patents

Abstract

This electronic device comprises: a memory for storing a minimum duty ratio; an inverter for converting a direct current power source into an alternating current power source; a motor; and at least one processor for transmitting the converted alternating current power source to a motor, wherein the at least one processor identifies a duty ratio of a pulse width modulation (PWM) signal for controlling the inverter, and, when the duty ratio of the PWM signal is less than or equal to the minimum duty ratio, controls, to be in an off state, a switch corresponding to the PWM signal from among a plurality of switches included in the inverter.

Description

Electronic device and method of controlling the same

The present disclosure relates to an electronic device and a control method thereof, and more particularly, to an electronic device for controlling a switch of an inverter that converts DC power into AC power and a control method thereof.

A PWM (Pulse Width Modulation) signal may be provided to an inverter that converts DC power into AC power. The inverter may provide a set AC power using the PWM signal. The pulse width of the PWM signal provided to the inverter may be limited. The minimum pulse width of the PWM signal may be determined for the stability of the circuit.

There is a problem that motor noise occurs when the minimum pulse width is determined. Despite the circuit stability, if motor noise occurs, the durability of electronic devices may be weakened due to vibration. If motor noise occurs, it may cause failure of some hardware components. If motor noise occurs, consumer satisfaction may decrease.

The present disclosure is designed to improve the above-described problem, and an object of the present disclosure is to provide an electronic device and a control method thereof for controlling a switch by considering the duty ratio of a pulse signal supplied to an inverter.

According to one embodiment, an electronic device includes a memory storing a minimum duty ratio, an inverter converting direct current power into alternating current power, a motor, and at least one processor transmitting the converted alternating current power to the motor, wherein the at least one processor identifies a duty ratio of a PWM (Pulse Width Modulation) signal for controlling the inverter, and if the duty ratio of the PWM signal is less than or equal to the minimum duty ratio, controls a switch corresponding to the PWM signal among a plurality of switches included in the inverter to be turned off.

The at least one processor can obtain a target time during which the duty ratio of the PWM signal is less than or equal to the minimum duty ratio, and control the switch to an OFF state during the target time.

The at least one processor can identify a first point in time when the duty ratio of the PWM signal becomes the minimum duty ratio while the duty ratio of the PWM signal is greater than the minimum duty ratio, identify a second point in time when the duty ratio of the PWM signal becomes the minimum duty ratio while the duty ratio of the PWM signal is less than the minimum duty ratio, and control the switch to be in an OFF state during the target time representing from the first point in time to the second point in time.

The at least one processor can change the switch from an ON state to an OFF state at the first time point, maintain the switch in the OFF state from the first time point to the second time point, and change the switch from the OFF state to an ON state at the second time point.

The at least one processor can obtain a maximum duty ratio by subtracting the minimum duty ratio from a duty ratio of 100%, and if the duty ratio of the PWM signal is greater than or equal to the maximum duty ratio, control the switch corresponding to the PWM signal to be in an ON state.

The target time is a first target time, and the at least one processor can obtain a second target time in which a duty ratio of the PWM signal is greater than or equal to the maximum duty ratio, and control the switch to be in an ON state during the second target time.

The at least one processor can identify a third point in time at which the duty ratio of the PWM signal becomes the maximum duty ratio while the duty ratio of the PWM signal is less than the maximum duty ratio, identify a fourth point in time at which the duty ratio of the PWM signal becomes the maximum duty ratio while the duty ratio of the PWM signal is greater than the maximum duty ratio, and control the switch to be in an ON state during the second target time representing from the third point in time to the fourth point in time.

The inverter is a three-phase inverter, the plurality of switches include a first switch, a second switch, a third switch, a fourth switch, a fifth switch, and a sixth switch, and the at least one processor can provide a first PWM signal corresponding to a first phase based on the first switch and the fourth switch, provide a second PWM signal corresponding to a second phase based on the second switch and the fifth switch, and provide a third PWM signal corresponding to a third phase based on the third switch and the sixth switch.

The at least one processor can control the fourth switch to be ON when the first switch is OFF, control the fifth switch to be ON when the second switch is OFF, and control the sixth switch to be ON when the third switch is OFF.

The above inverter may be a three-phase inverter using three DPWM (Discontinuous DPWM) signals spaced 120 degrees apart.

According to one embodiment, a control method of an electronic device including a memory storing a minimum duty ratio, an inverter converting direct current power into alternating current power, and a motor, wherein the electronic device transmits the converted alternating current power to the motor, the control method includes a step of identifying a duty ratio of a PWM (Pulse Width Modulation) signal for controlling the inverter, and a step of controlling a switch corresponding to the PWM signal among a plurality of switches included in the inverter to an OFF state if the duty ratio of the PWM signal is less than or equal to the minimum duty ratio.

The above control method further includes a step of obtaining a target time during which the duty ratio of the PWM signal is less than or equal to the minimum duty ratio, and the step of controlling the switch to an OFF state can control the switch to an OFF state during the target time.

The step of controlling the switch to an OFF state may include identifying a first point in time when the duty ratio of the PWM signal becomes the minimum duty ratio while the duty ratio of the PWM signal is greater than the minimum duty ratio, identifying a second point in time when the duty ratio of the PWM signal becomes the minimum duty ratio while the duty ratio of the PWM signal is less than the minimum duty ratio, and controlling the switch to an OFF state during the target time representing from the first point in time to the second point in time.

The step of controlling the switch to an OFF state may include changing the switch from an ON state to an OFF state at the first time point, maintaining the switch in the OFF state from the first time point to the second time point, and changing the switch from the OFF state to an ON state at the second time point.

The above control method may include a step of obtaining a maximum duty ratio by subtracting the minimum duty ratio from a duty ratio of 100%, and a step of controlling the switch corresponding to the PWM signal to an ON state if the duty ratio of the PWM signal is greater than or equal to the maximum duty ratio.

The target time is a first target time, the control method further includes a step of obtaining a second target time in which a duty ratio of the PWM signal is greater than or equal to the maximum duty ratio, and the step of controlling the switch to an ON state can control the switch to an ON state during the second target time.

The step of controlling the switch to an ON state may include identifying a third point in time at which the duty ratio of the PWM signal becomes the maximum duty ratio while the duty ratio of the PWM signal is less than the maximum duty ratio, identifying a fourth point in time at which the duty ratio of the PWM signal becomes the maximum duty ratio while the duty ratio of the PWM signal is greater than the maximum duty ratio, and controlling the switch to an ON state during the second target time representing from the third point in time to the fourth point in time.

The above inverter is a three-phase inverter, the plurality of switches include a first switch, a second switch, a third switch, a fourth switch, a fifth switch, and a sixth switch, and the control method may further include a step of providing a first PWM signal corresponding to a first phase based on the first switch and the fourth switch, a step of providing a second PWM signal corresponding to a second phase based on the second switch and the fifth switch, and a step of providing a third PWM signal corresponding to a third phase based on the third switch and the sixth switch.

The above control method may further include a step of controlling the fourth switch to an ON state if the first switch is in an OFF state, a step of controlling the fifth switch to an ON state if the second switch is in an OFF state, and a step of controlling the sixth switch to an ON state if the third switch is in an OFF state.

The above inverter may be a three-phase inverter using three DPWM (Discontinuous DPWM) signals spaced 120 degrees apart.

FIG. 1 is a drawing for explaining an operation of supplying power to a motor according to one embodiment.

FIG. 2 is a block diagram illustrating an electronic device according to one embodiment.

FIG. 3 is a block diagram illustrating a specific configuration of the electronic device of FIG. 2, according to one embodiment.

FIG. 4 is a drawing for explaining an operation of converting power through an inverter according to one embodiment.

FIG. 5 is a diagram for explaining an operation of generating a PWM (Pulse Width Modulation) signal according to one embodiment.

FIG. 6 is a diagram for explaining a Space Vector Pulse Width Modulation (SVPWM) control operation according to one embodiment.

FIG. 7 is a diagram for explaining SVPWM control operation according to one embodiment.

FIG. 8 is a diagram for explaining a DPWM (Discontinuous Pulse Width Modulation) control operation according to one embodiment.

FIG. 9 is a diagram for explaining a DPWM control operation according to one embodiment.

FIG. 10 is a diagram for explaining an operation of controlling DPWM without a minimum pulse width limitation according to one embodiment.

FIG. 11 is a diagram for explaining an operation of identifying a target time according to a minimum pulse width limitation, according to one embodiment.

FIG. 12 is a diagram for explaining an operation of controlling DPWM by applying a minimum pulse width limitation according to one embodiment.

FIG. 13 is a diagram for explaining an operation of controlling DPWM using minimum pulse width limitation and switching control according to one embodiment.

FIG. 14 is a diagram for explaining an operation of controlling DPWM using minimum pulse width limitation and switching control according to one embodiment.

FIG. 15 is a drawing for explaining an operation of controlling a switch using a minimum duty ratio according to one embodiment.

FIG. 16 is a drawing for explaining an operation of controlling a switch using a minimum duty ratio according to one embodiment.

FIG. 17 is a drawing for explaining an operation of controlling a switch using a minimum duty ratio according to one embodiment.

FIG. 18 is a drawing for explaining an operation of controlling a switch using a maximum duty ratio according to one embodiment.

FIG. 19 is a drawing for explaining an operation of controlling a switch using a maximum duty ratio according to one embodiment.

FIG. 20 is a drawing for explaining a method for controlling an electronic device according to one embodiment.

It should be understood that the various embodiments of this document and the terminology used herein are not intended to limit the technical features described in this document to specific embodiments, but rather to encompass various modifications, equivalents, or alternatives of the embodiments.

In connection with the description of the drawings, similar reference numerals may be used for similar or related components.

The singular form of a noun corresponding to an item may include one or more of said items, unless the context clearly indicates otherwise.

In this document, each of the phrases "A or B", "at least one of A and B", "at least one of A or B", "A, B, or C", "at least one of A, B, and C", and "at least one of A, B, or C" can include any one of the items listed together in that phrase, or all possible combinations of them.

The term “and/or” includes any combination of multiple related described elements or any one of multiple related described elements.

Terms such as "first", "second", or "first" or "second" may be used merely to distinguish one component from another, and do not limit the components in any other respect (e.g., importance or order).

When a component (e.g., a first component) is referred to as being “coupled” or “connected” to another component (e.g., a second component), with or without the terms “functionally” or “communicatively,” it means that the component can be connected to the other component directly (e.g., wired), wirelessly, or through a third component.

The terms “include” or “have” are intended to specify the presence of a feature, number, step, operation, component, part, or combination thereof described in this document, but do not exclude the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

When a component is said to be “connected,” “coupled,” “supported,” or “in contact with” another component, this includes not only cases where the components are directly connected, coupled, supported, or in contact, but also cases where the components are indirectly connected, coupled, supported, or in contact through a third component.

When we say that a component is “on” another component, this includes not only cases where the component is in contact with the other component, but also cases where there is another component between the two components.

Washing machines according to various embodiments can perform washing, rinsing, dehydration, and drying processes. Washing machines are an example of clothes treatment devices, and clothes treatment devices are a concept encompassing devices that wash clothes (laundry items, drying items), devices that dry clothes, and devices that can perform both washing and drying of clothes.

Washing machines according to various embodiments may include top-loading washing machines in which a laundry inlet for putting in or taking out laundry is provided to face upward, or front-loading washing machines in which a laundry inlet is provided to face forward. Washing machines according to various embodiments may include washing machines of other loading methods other than top-loading washing machines and front-loading washing machines.

In the case of a top-loading washing machine, laundry can be washed using a water current generated by a rotating body such as a pulsator. In the case of a front-loading washing machine, laundry can be washed by rotating a drum to repeatedly raise and lower the laundry. The front-loading washing machine may include a washing machine with a dryer capable of drying laundry accommodated inside the drum. The washing machine with a dryer may include a hot air supply device for supplying high-temperature air into the drum and a condensing device for removing moisture from air discharged from the drum. As an example, the washing machine with a dryer may include a heat pump device. The washing machine according to various embodiments may include a washing machine with a washing method other than the washing method described above.

A washing machine according to various embodiments may include a housing that accommodates various components therein. The housing may be provided in the form of a box with a laundry inlet formed on one side.

The washing machine may include a door for opening and closing the laundry compartment. The door may be rotatably mounted to the housing by a hinge. At least a portion of the door may be transparent or translucent to allow the interior of the housing to be seen.

The washing machine may include a tub provided inside the housing to store water. The tub may be provided in a generally cylindrical shape with a tub opening formed on one side, and may be arranged inside the housing so that the tub opening corresponds to the laundry inlet.

The tub may be connected to the housing by a damper. The damper may absorb vibrations generated when the drum rotates, thereby attenuating vibrations transmitted to the housing.

A washing machine may include a drum configured to accommodate laundry.

The drum can be positioned inside the tub so that the drum opening provided on one side corresponds to the laundry inlet and the tub opening. Laundry can be accommodated in the drum or taken out from the drum by passing through the laundry inlet, the tub opening, and the drum opening in sequence.

The drum can perform each operation of washing, rinsing, and/or dehydration while rotating inside the tub. A plurality of holes are formed in the cylindrical wall of the drum so that water stored in the tub can flow into the inside of the drum or flow out of the outside of the drum.

The washing machine may include a driving device configured to rotate the drum. The driving device may include a driving motor and a rotating shaft for transmitting driving force generated by the driving motor to the drum. The rotating shaft may be connected to the drum by passing through the tub.

The drive device can rotate the drum forward or backward to perform each operation according to the washing, rinsing, and/or dehydration, or drying cycle.

The washing machine may include a water supply device configured to supply water to the tub. The water supply device may include a water supply pipe and a water supply valve provided on the water supply pipe. The water supply pipe may be connected to an external water source. The water supply pipe may extend from the external water source to the detergent supply device and/or the tub. Water may be supplied to the tub via the detergent supply device. Water may be supplied to the tub without passing through the detergent supply device.

The water supply valve can open or close the water supply line in response to an electrical signal from the control unit. The water supply valve can allow or block the supply of water to the tub from an external water source. The water supply valve can include, for example, a solenoid valve that opens and closes in response to an electrical signal.

The washing machine may include a detergent supply device configured to supply detergent to the tub. The detergent supply device may include a manual detergent supply device that requires a user to insert detergent to be used for each wash, and an automatic detergent supply device that stores a large amount of detergent and automatically inserts a predetermined amount of detergent during the wash. The detergent supply device may include a detergent box for storing detergent. The detergent supply device may be configured to supply detergent into the tub during a water supply process. Water supplied through a water supply pipe may be mixed with detergent via the detergent supply device. The water mixed with detergent may be supplied into the tub. Detergent is used as a term encompassing a pre-wash detergent, a main wash detergent, a fabric softener, a bleach, etc., and the detergent box may be divided into a pre-wash detergent storage area, a main wash detergent storage area, a fabric softener storage area, and a bleach storage area.

The washing machine may include a drain device configured to discharge water contained in the tub to the outside. The drain device may include a drain pipe extending from the bottom of the tub to the outside of the housing, a drain valve provided on the drain pipe to open and close the drain pipe, and a pump provided on the drain pipe. The pump may pump water in the drain pipe to the outside of the housing.

The washing machine may include a control panel disposed on one side of the housing. The control panel may provide a user interface for a user to interact with the washing machine. The user interface may include at least one input interface and at least one output interface.

At least one input interface can convert sensory information received from a user into an electrical signal.

The at least one input interface may include a power button, an operation button, a course selection dial (or a course selection button), and a wash/rinse/spin setting button. The at least one input interface may include, for example, a tact switch, a push switch, a slide switch, a toggle switch, a micro switch, a touch switch, a touch pad, a touch screen, a jog dial, and/or a microphone.

At least one output interface can visually or audibly convey information related to the operation of the washing machine to the user.

For example, at least one output interface can convey information related to a washing course and operating time of the washing machine, washing settings/rinsing settings/spin settings to the user. Information related to the operation of the washing machine can be output by a screen, an indicator, voice, etc. At least one output interface can include, for example, a liquid crystal display (LCD) panel, a light emitting diode (LED) panel, a speaker, etc.

The washing machine may include a communication module for communicating with external devices via wired and/or wireless means.

The communication module may include at least one of a short-range communication module or a long-range communication module.

The communication module can transmit data to an external device (e.g., a server, a user device, and/or a home appliance), or receive data from an external device. For example, the communication module can establish communication with a server and/or a user device and/or a home appliance, and transmit and receive various data.

To this end, the communication module can support establishment of a direct (e.g., wired) communication channel or a wireless communication channel between external devices, and performance of communication through the established communication channel. According to one embodiment, the communication module can include a wireless communication module (e.g., a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module) or a wired communication module (e.g., a local area network (LAN) communication module, or a power line communication module). Any of these communication modules can communicate with the external device through a first network (e.g., a short-range communication network such as Bluetooth, wireless fidelity (WiFi) direct, or infrared data association (IrDA)) or a second network (e.g., a long-range communication network such as a legacy cellular network, a 5G network, a next-generation communication network, the Internet, or a computer network (e.g., a LAN or WAN)). These various types of communication modules can be integrated into a single component (e.g., a single chip) or implemented as a plurality of separate components (e.g., multiple chips).

A short-range wireless communication module may include, but is not limited to, a Bluetooth communication module, a BLE (Bluetooth Low Energy) communication module, a Near Field Communication module, a WLAN (Wi-Fi) communication module, a Zigbee communication module, an infrared (IrDA, infrared Data Association) communication module, a WFD (Wi-Fi Direct) communication module, a UWB (ultrawideband) communication module, an Ant+ communication module, a microwave (uWave) communication module, etc.

The long-distance communication module may include a communication module that performs various types of long-distance communication and may include a mobile communication unit. The mobile communication unit transmits and receives a wireless signal with at least one of a base station, an external terminal, and a server on a mobile communication network.

In one embodiment, the communication module can communicate with external devices such as a server, a user device, and other home appliances through a peripheral access point (AP). The access point (AP) can connect a local area network (LAN) to which the washing machine or the user device is connected to a wide area network (WAN) to which the server is connected. The washing machine or the user device can be connected to the server through the wide area network (WAN). The control unit can control various components of the washing machine (e.g., a drive motor, a water inlet valve). The control unit can control various components of the washing machine to perform at least one cycle including water supply, washing, rinsing, and/or spin-drying according to a user input. For example, the control unit can control the drive motor to adjust the rotation speed of the drum, or control the water inlet valve of the water supply device to supply water to the tub.

The control unit may include hardware such as a CPU or a memory, and software such as a control program. For example, the control unit may include an algorithm for controlling the operation of components in the washing machine, at least one memory storing data in the form of a program, and at least one processor performing the above-described operation using data stored in the at least one memory. The memory and the processor may each be implemented as separate chips. The processor may include one or more processor chips or one or more processing cores. The memory may include one or more memory chips or one or more memory blocks. In addition, the memory and the processor may be implemented as a single chip.

FIG. 1 is a drawing for explaining an operation of supplying power to a motor according to one embodiment.

FIG. 1 shows an electronic device (100) that may include at least one of a PWM control unit (131), a converter (171), an inverter (172), and a motor (173).

The electronic device (100) may be a device that supplies power using a PWM signal. The electronic device (100) may supply power to a motor (173). The electronic device (100) may supply power to a motor (173) using a PWM signal. For example, the electronic device (100) may be implemented as a washing machine, a dryer, an air conditioner, an air purifier, a hair dryer, a dehumidifier, a vacuum cleaner, a robot, etc. The electronic device (100) may be described as a home appliance or an electronic device for home appliances.

The PWM control unit (131) can perform a control operation related to a PWM signal. The PWM control unit (131) can generate a PWM signal and perform an operation of converting the generated PWM signal.

The PWM control unit (131) can control at least one of the converter (171) or the inverter (172). The PWM control unit (131) can control at least one of the converter (171) or the inverter (172) using a control signal.

PWM signals can be classified according to two criteria.

PWM signals can be divided into carrier-based PWM and space vector-based PWM depending on the implementation method. Carrier-based PWM is described in Fig. 5. Space vector-based PWM is described in Figs. 6 and 7.

PWM signals can be classified into continuous PWM and discontinuous PWM depending on the modulated (converted) power form. Discontinuous PWM (DPWM) is described in Figs. 8 and 9.

The converter (171) can convert AC power into DC power. The converter (171) can receive AC power provided from a power supply. The converter (171) can convert the received AC power into DC power.

The inverter (172) can convert DC power into AC power. The inverter (172) can determine at least one of the strength (or size) and frequency of the AC power supplied to the motor based on a preset conversion method. The inverter (172) can convert the DC power into AC power based on at least one of the strength or frequency of the power.

The inverter (172) can transmit the converted AC power to the motor (173).

FIG. 2 is a block diagram illustrating an electronic device according to one embodiment.

The electronic device (100) may include at least one of a memory (140), an inverter (172), a motor (173), and at least one processor (130).

The memory (140) can store the minimum duty ratio (d_min).

An inverter (172) can convert direct current power into alternating current power.

The motor (173) can transmit physical force to the electronic device (100). The electronic device (100) can be driven based on the physical force transmitted from the motor (173).

At least one processor (130) can transmit the converted AC power to the motor (173). At least one processor (130) can include the PWM control unit (131) of FIG. 1.

The inverter (172) and the motor (173) may be included in the driving unit (170) of Fig. 3.

At least one processor (130) can identify the duty ratio of a PWM (Pulse Width Modulation) signal for controlling an inverter (172).

At least one processor (130) can control a switch corresponding to a PWM signal among a plurality of switches included in an inverter (172) to an OFF state if the duty ratio of the PWM signal is less than or equal to a minimum duty ratio (d_min).

At least one processor (130) can generate a PWM signal to control an inverter (172). The inverter (172) can convert (or change) direct current power into alternating current power. The inverter (172) can use the PWM signal to set the size of the alternating current power or the frequency of the alternating current power.

At least one processor (130) can generate a PWM signal based on a preset method.

According to various embodiments, the PWM signal may be generated from a hardware configuration other than at least one processor (130). As an example, the PWM signal may be generated directly from a PWM signal generation unit included in the electronic device (100). As an example, the PWM signal may be generated directly from an inverter (172).

At least one processor (130) can identify (or obtain) a duty ratio of a generated PWM signal. At least one processor (130) can analyze the duty ratio of the PWM signal in real time. At least one processor (130) can analyze a repetitive waveform of the PWM signal. At least one processor (130) can control a switch corresponding to the PWM signal using the duty ratio of the waveform of the PWM signal.

The inverter (172) may include a plurality of switches. A description related to an inverter (172) including a plurality of switches is described in FIG. 4.

At least one processor (130) can identify a switch among a plurality of switches included in the inverter (172) that corresponds to a PWM signal.

For example, if the PWM signal corresponds to the first phase (a), at least one processor (130) can identify the first switch (401) corresponding to the first phase (a).

For example, if the PWM signal corresponds to the second phase (b), at least one processor (130) can identify the second switch (402) corresponding to the second phase (b).

For example, if the PWM signal corresponds to the third phase (c), at least one processor (130) can identify the third switch (403) corresponding to the third phase (c).

At least one processor (130) can control a switch corresponding to the PWM signal by comparing the duty ratio of the PWM signal with the minimum duty ratio (d_min). The duty ratio of the PWM signal can represent the ratio of the time that the pulse remains High (or 1) in a unit time. The duty ratio of the PWM signal can be described as a PWM duty ratio, a measurement duty ratio, a pulse duty ratio, etc.

At least one processor (130) can obtain minimum pulse width information. The minimum pulse width information can include information for limiting the pulse width for each pulse to a specific value in relation to a PWM signal. The minimum pulse width information can include a minimum duty ratio (d_min). When the minimum pulse width is used, the stability of the circuit can be improved. At least one processor (130) can generate a PWM signal using the minimum duty ratio (d_min).

At least one processor (130) can control the inverter (172) so that the duty ratio does not become lower than the minimum duty ratio (d_min). At least one processor (130) can control a switch corresponding to the PWM signal so that a PWM signal having a duty ratio lower than the minimum duty ratio (d_min) is not provided to the inverter (172).

The minimum duty ratio (d_min) may be described as the critical duty ratio, the first duty ratio, the first critical duty ratio, etc.

According to various embodiments, the minimum pulse width information may include a minimum time of the pulse width. The minimum time of the pulse width may mean an absolute time concept. For example, the minimum time may be 0.7us. At least one processor (130) may provide a PWM signal having a pulse width greater than the minimum time to the inverter (172). The pulse width may represent the time for which the PWM signal remains High (or 1) in one cycle of the waveform.

At least one processor (130) can compare the duty ratio of the PWM signal with the minimum duty ratio (d_min) and control the switch corresponding to the PWM signal to the OFF state.

At least one processor (130) can control a switch corresponding to a PWM signal among a plurality of switches included in an inverter (172) to an OFF state if the duty ratio of the PWM signal is less than or equal to a minimum duty ratio (d_min).

For example, if the duty ratio of the PWM signal (Van) for the first phase (a) is less than or equal to the minimum duty ratio (d_min), at least one processor (130) can control the first switch (401) corresponding to the first phase (a) to the OFF state.

For example, if the duty ratio of the PWM signal (Vbn) for the second phase (b) is less than or equal to the minimum duty ratio (d_min), at least one processor (130) can control the second switch (402) corresponding to the second phase (b) to the OFF state.

For example, if the duty ratio of the PWM signal (Vcn) for the third phase (c) is less than or equal to the minimum duty ratio (d_min), at least one processor (130) can control the third switch (403) corresponding to the third phase (c) to the OFF state.

At least one processor (130) can obtain a target time in which the duty ratio of the PWM signal is less than or equal to the minimum duty ratio (d_min), and control the switch to be in the OFF state during the target time.

At least one processor (130) can identify whether the duty ratio of the PWM signal is less than or equal to the minimum duty ratio (d_min). At least one processor (130) can determine a time when the duty ratio of the PWM signal is less than or equal to the minimum duty ratio (d_min) as a target time. At least one processor (130) can control a switch corresponding to the PWM signal to an OFF state during the target time.

For example, at least one processor (130) can obtain a target time (ta12) in which the duty ratio of the PWM signal (Van) for the first phase (a) is less than or equal to the minimum duty ratio (d_min). At least one processor (130) can control the first switch (401) to be OFF during the target time (ta12).

For example, at least one processor (130) can obtain a target time (tb12) in which the duty ratio of the PWM signal (Vbn) for the second phase (b) is less than or equal to the minimum duty ratio (d_min). At least one processor (130) can control the second switch (402) to be OFF during the target time (tb12).

For example, at least one processor (130) can obtain a target time (tc12) in which the duty ratio of the PWM signal (Vcn) for the third phase (c) is less than or equal to the minimum duty ratio (d_min). At least one processor (130) can control the third switch (403) to be OFF during the target time (tc12).

A detailed description of calculating the target time in three phases is described in Fig. 16.

At least one processor (130) can identify a first time point (ta1) at which the duty ratio of the PWM signal becomes the minimum duty ratio (d_min) while the duty ratio of the PWM signal is greater than the minimum duty ratio (d_min).

At least one processor (130) can identify a second time point (ta2) at which the duty ratio of the PWM signal becomes the minimum duty ratio (d_min) while the duty ratio of the PWM signal is less than the minimum duty ratio (d_min).

At least one processor (130) can control the switch to be OFF during a target time representing a first time point (ta1) to a second time point (ta2).

At least one processor (130) can change a switch from an ON state to an OFF state at a first time point (ta1).

At least one processor (130) can keep the switch in an OFF state from a first time point (ta1) to a second time point (ta2).

At least one processor (130) can change the switch from an OFF state to an ON state at a second time point (ta2).

The second time point (ta2) may be a time point after the first time point (ta1).

A detailed description of calculating each point in phase 3 is described in Figure 17.

At least one processor (130) can obtain the maximum duty ratio (d_max) by subtracting the minimum duty ratio (d_min) from the duty ratio of 100%.

At least one processor (130) can control a switch corresponding to a PWM signal to be in an ON state if the duty ratio of the PWM signal is greater than or equal to the maximum duty ratio (d_max).

The maximum duty ratio (d_max) may be a value used to limit the duty ratio of the PWM signal to the maximum. At least one processor (130) may not generate a PWM signal greater than the maximum duty ratio (d_max). An operation using the maximum duty ratio (d_max) may not be essential. In order not to provide a PWM signal with a duty ratio greater than the maximum duty ratio (d_max), at least one processor (130) may identify whether the duty ratio of the PWM signal is greater than the maximum duty ratio (d_max).

At least one processor (130) can determine (or identify) the value obtained by subtracting the minimum duty ratio (d_min) from the duty ratio of 100% as the minimum duty ratio (d_min).

When the duty ratio of the PWM signal is greater than or equal to the maximum duty ratio (d_max), at least one processor (130) can control a switch corresponding to the PWM signal to be in the ON state.

At least one processor (130) can continuously control a switch corresponding to a PWM signal to be in an ON state for a time period in which the duty ratio of the PWM signal is greater than or equal to the maximum duty ratio (d_max).

At least one processor (130) can obtain (or identify) a target time identified using a minimum duty cycle (d_min) as a first target time. The first target time can be described as a first type of target time.

At least one processor (130) can obtain (or identify) the identified target time using the maximum duty ratio (d_max) as a second target time. The second target time can be described as a second type of target time.

At least one processor (130) can obtain a second target time during which the duty ratio of the PWM signal is predicted (or identified) to be greater than the maximum duty ratio (d_max). At least one processor (130) can control the switch to be in an ON state during the second target time.

A specific explanation of using the maximum duty ratio (d_max) in three phases is described in Fig. 18.

At least one processor (130) can identify a third time point (ta3) at which the duty ratio of the PWM signal becomes the maximum duty ratio (d_max) while the duty ratio of the PWM signal is less than the maximum duty ratio (d_max).

At least one processor (130) can identify a fourth time point (ta4) at which the duty ratio of the PWM signal becomes the maximum duty ratio (d_max) while the duty ratio of the PWM signal is greater than the maximum duty ratio (d_max).

At least one processor (130) can control the switch to be in an ON state during a second target time period representing a third time point (ta3) to a fourth time point (ta4).

The fourth time point (ta4) may be a time point after the third time point (ta3).

The operation of calculating the point in time of each of the three phases is described in Fig. 19.

The inverter (172) may be a three-phase inverter (172). A description of the three-phase inverter (172) is given in FIGS. 4 to 9.

The plurality of switches may include a first switch (401), a second switch (402), a third switch (403), a fourth switch (404), a fifth switch (405), and a sixth switch (406).

At least one processor (130) can provide a first PWM signal corresponding to the first phase (a) based on the first switch (401) and the fourth switch (404).

At least one processor (130) can provide a second PWM signal corresponding to the second phase (b) based on the second switch (402) and the fifth switch (405).

At least one processor (130) can provide a third PWM signal corresponding to the third phase (c) based on the third switch (403) and the sixth switch (406).

A description of the multiple switches is given in Fig. 4.

The first group of switches corresponding to the first phase (a) may include a first switch (401) and a fourth switch (404). The on/off state of the first switch (401) and the on/off state of the fourth switch (404) may be opposite.

The second group of switches corresponding to the second phase (b) may include a second switch (402) and a fifth switch (405). The on/off state of the second switch (402) and the on/off state of the fifth switch (405) may be opposite.

The third group of switches corresponding to the third phase (c) may include a third switch (403) and a sixth switch (406). The on/off state of the third switch (403) and the on/off state of the sixth switch (406) may be opposite.

When the first switch (401) is in the OFF state, at least one processor (130) can control the fourth switch (404) to the ON state. When the first switch (401) is in the ON state, at least one processor (130) can control the fourth switch (404) to the OFF state.

When the second switch (402) is in the OFF state, at least one processor (130) can control the fifth switch (405) to the ON state. When the second switch (402) is in the ON state, at least one processor (130) can control the fifth switch (405) to the OFF state.

When the third switch (403) is in the OFF state, at least one processor (130) can control the sixth switch (406) to the ON state. When the third switch (403) is in the ON state, at least one processor (130) can control the sixth switch (406) to the OFF state.

The inverter (172) may be a three-phase inverter using three DPWM (Discontinuous DPWM) signals spaced 120 degrees apart.

Specific descriptions related to DPWM are described in Figs. 8 and 9.

Descriptions related to the duty ratio and pulse width of DPWM are described in Figs. 10 and 11.

The operation of applying minimum pulse width information to DPWM is described in Fig. 12.

The operation for controlling the on/off of the switch for DPWM is described in Fig. 13.

Despite providing a 120 degree DPWM signal, at least one processor (130) may keep two switches OFF simultaneously during some periods.

For example, referring to FIG. 13, at least one processor (130) can control the first switch (401) and the third switch (403) to be OFF from time point (ta1) to time point (tc2).

For example, referring to FIG. 13, at least one processor (130) can control the first switch (401) and the second switch (402) to be OFF from a time point (tb1) to a time point (ta2).

For example, referring to FIG. 13, at least one processor (130) can control the second switch (402) and the third switch (403) to be OFF from a time point (tc1) to a time point (tb2).

The ordinal numbers, such as first, second, etc., described above may be changed depending on the embodiment.

FIG. 3 is a block diagram illustrating a specific configuration of the electronic device of FIG. 2, according to one embodiment.

Referring to FIG. 3, the electronic device (100) may include at least one of a display (110), a communication interface (120), a processor (130), a memory (140), a user interface (150), a speaker (160), a driving unit (170), a detergent supply unit (181), a water supply unit (182), or a drain unit (183).

The display (110) may be implemented as various types of displays, such as an LCD (Liquid Crystal Display), an OLED (Organic Light Emitting Diodes) display, and a PDP (Plasma Display Panel). The display (110) may also include a driving circuit, a backlight unit, and the like, which may be implemented as types, such as an a-si TFT (amorphous silicon thin film transistor), an LTPS (low temperature poly silicon) TFT, and an OTFT (organic TFT). The display (110) may be implemented as a touch screen combined with a touch sensor, a flexible display, a three-dimensional display (3D display, three-dimensional dispaly), and the like. According to an embodiment of the present disclosure, the display (110) may include not only a display panel that outputs an image, but also a bezel that houses the display panel. In particular, according to an embodiment of the present disclosure, the bezel may include a touch sensor for detecting user interaction.

The communication interface (120) is a configuration that performs communication with various types of external devices according to various types of communication methods. The communication interface (120) may include a wireless communication module or a wired communication module. Each communication module may be implemented in the form of at least one hardware chip.

The wireless communication module may be a module that communicates wirelessly with an external device. For example, the wireless communication module may include at least one of a Wi-Fi module, a Bluetooth module, an infrared communication module, or other communication modules.

The Wi-Fi module and Bluetooth module can communicate in the Wi-Fi and Bluetooth modes, respectively. When using the Wi-Fi module or Bluetooth module, various connection information such as the SSID (service set identifier) and session key are first sent and received, and then communication is established using this, and various information can be sent and received.

Infrared communication modules perform communication based on infrared communication (IrDA, infrared Data Association) technology, which transmits data wirelessly over short distances using infrared light, which is between visible light and millimeter waves.

Other communication modules may include at least one communication chip that performs communication according to various wireless communication standards, such as zigbee, 3G (3rd Generation), 3GPP (3rd Generation Partnership Project), LTE (Long Term Evolution), LTE-A (LTE Advanced), 4G (4th Generation), and 5G (5th Generation), in addition to the above-described communication methods.

The wired communication module may be a module that communicates with an external device via a wire. For example, the wired communication module may include at least one of a Local Area Network (LAN) module, an Ethernet module, a pair cable, a coaxial cable, a fiber optic cable, or an Ultra Wide-Band (UWB) module.

According to various embodiments, the communication interface (120) may utilize the same communication module (e.g., a Wi-Fi module) to communicate with an external device such as a remote control device and an external server.

According to various embodiments, the communication interface (120) may utilize different communication modules to communicate with external devices such as a remote control device and an external server. For example, the communication interface (120) may utilize at least one of an Ethernet module or a Wi-Fi module to communicate with an external server, and may utilize a Bluetooth module to communicate with an external device such as a remote control device. However, this is only one embodiment, and the communication interface (120) may utilize at least one of various communication modules when communicating with multiple external devices or external servers.

At least one processor (130) may be implemented as a digital signal processor (DSP), a microprocessor, or a time controller (TCON) that processes digital signals. However, the present invention is not limited thereto, and may include one or more of a central processing unit (CPU), a micro controller unit (MCU), a micro processing unit (MPU), a controller, an application processor (AP), a graphics-processing unit (GPU), a communication processor (CP), or an advanced reduced instruction set computer (RISC) machines (ARM) processors, or may be defined by the relevant terms. At least one processor (130) may be implemented as a system on chip (SoC) having a processing algorithm built-in, a large scale integration (LSI), or may be implemented in the form of a field programmable gate array (FPGA). At least one processor (130) may perform various functions by executing computer executable instructions stored in a memory.

The memory (140) may be implemented as an internal memory such as a ROM (for example, an electrically erasable programmable read-only memory (EEPROM)), a RAM, etc. included in at least one processor (120), or may be implemented as a separate memory from at least one processor (120). The memory (140) may be implemented as a memory embedded in the electronic device (100) or as a memory that can be attached or detached from the electronic device (100) depending on the purpose of data storage. For example, data for operating the electronic device (100) may be stored in a memory embedded in the electronic device (100), and data for expanding functions of the electronic device (100) may be stored in a memory that can be attached or detached from the electronic device (100).

In the case of memory embedded in the electronic device (100), it may be implemented as at least one of volatile memory (e.g., dynamic RAM (DRAM), static RAM (SRAM), or synchronous dynamic RAM (SDRAM)), non-volatile memory (e.g., one time programmable ROM (OTPROM), programmable ROM (PROM), erasable and programmable ROM (EPROM), electrically erasable and programmable ROM (EEPROM), mask ROM, flash ROM, flash memory (e.g., NAND flash or NOR flash), a hard drive, or a solid state drive (SSD)), and in the case of memory that can be detachably attached to the electronic device (100), it may be implemented in the form of a memory card (e.g., compact flash (CF), secure digital (SD), micro secure digital (Micro-SD), mini secure digital (Mini-SD), extreme digital (xD), multi-media card (MMC)), external memory that can be connected to a USB port (e.g., USB memory).

The memory (140) can store at least one instruction. Based on the instruction stored in the memory (140), at least one processor (120) can perform various operations.

The operation interface (150) may be implemented as a device such as a button, a touch pad, a mouse, and a keyboard, or may be implemented as a touch screen capable of performing the display function and operation input function described above. The button may be a mechanical button, a touch pad, a wheel, or various other types of buttons formed on any area of the front, side, or back of the main body of the electronic device (100).

The speaker (160) may be a component that outputs various audio data processed in the input/output interface as well as various notification sounds or voice messages.

The driving unit (170) may include a driving motor. The driving unit (170) rotates the drum containing laundry. Specifically, the driving unit (170) may drive the driving motor to rotate the drum containing laundry. The driving motor of the driving unit (170) receives power and generates driving force, and the driving unit (170) may transmit the generated driving force to the pulsator alone or simultaneously to the drum and the pulsator. In addition, the driving unit (170) may receive a driving control signal generated by the processor (130) and drive the detergent supply unit (181) so that the detergent contained in the detergent supply unit (181) is supplied to the drum containing laundry. In addition, the driving unit (170) can receive a driving control signal generated by the processor (130) to drive the water supply unit (182) to supply washing water into the drum or drive the drain unit (183) to discharge washing water contained in the drum out of the electronic device (100).

The detergent supply unit (181) can supply detergent stored in the detergent storage unit to the drum containing laundry according to the driving of the driving unit (170). The detergent supply unit (181) can be connected to a detergent pipe. When the water supply valve of the water supply unit (182) is opened and water is supplied to the water supply pipe, the detergent supplied from the detergent supply unit (181) can be mixed in the water and dissolved. Then, the water mixed with the dissolved detergent can be supplied to the drum containing laundry through the water supply pipe.

The water supply unit (182) may include a water supply pipe connected to an external water source and a water supply valve for opening and closing the water supply pipe. When the water supply valve is opened, water can be supplied from the external water source through the water supply pipe.

The drainage unit (183) may include a pump, a first drain pipe, and a second drain pipe. The pump may suck water from the drum. One end of the first drain pipe may be connected to the bottom of the drum, and the other end may be connected to the pump to move water from the drum to the pump. One end of the second drain pipe may be connected to the pump, and the other end may extend to the outside of the main body of the electronic device (100) to allow water from the drum to be discharged to the outside. Accordingly, when the pump operates, water from the drum may be discharged to the outside of the electronic device (100) through the first drain pipe and the second drain pipe.

According to various embodiments, the electronic device (100) may additionally include a drying unit. The drying unit may include a heater and a blower fan. In addition, the drying unit may apply heat to the drum at a predefined temperature using the heater and the blower fan and dry the laundry. However, the drying unit is not an essential component of the electronic device (100), and depending on the implementation example, the drying unit may not be included in the electronic device (100).

According to various embodiments, the electronic device (100) may include a microphone. The microphone is a configuration for receiving a user's voice or other sounds and converting them into audio data. The microphone may receive the user's voice in an activated state. For example, the microphone may be formed integrally on the upper side, the front side, the side side, etc. of the electronic device (100). The microphone may include various configurations such as a microphone for collecting an analog user's voice, an amplifier circuit for amplifying the collected user's voice, an A/D conversion circuit for sampling the amplified user's voice and converting it into a digital signal, and a filter circuit for removing a noise component from the converted digital signal.

According to various embodiments, the electronic device (100) may include a camera. The camera is a configuration for capturing a subject to generate a captured image, and the captured image is a concept that includes both a moving image and a still image. The camera can acquire an image for at least one external device, and may be implemented as a camera, a lens, an infrared sensor, etc.

The camera may include a lens and an image sensor. The types of lenses include general-purpose lenses, wide-angle lenses, zoom lenses, etc., and may be determined according to the type, characteristics, and usage environment of the electronic device (100). The image sensor may include a complementary metal oxide semiconductor (CMOS) and a charge coupled device (CCD).

FIG. 4 is a drawing for explaining an operation of converting power through an inverter according to one embodiment.

Referring to FIG. 4, the inverter (172) may include a plurality of switches (401, 402, 403, 404, 405, 406). The inverter (172) may supply three-phase power. The inverter (172) supplying three-phase power may include six switches. Each switch may be implemented as a MOSFET or an IGBT, etc. The six switches may be divided into an upper switch and a lower switch.

The inverter (172) may include an Intelligent Power Module (IPM). The IPM may convert DC to AC and deliver power to the motor (173). The IPM may include multiple switches.

There may be three upper switches (401, 402, 403) and three lower switches (404, 405, 406). The inverter (172) can control each phase of the three-phase power supply using one upper switch and one lower switch.

For example, the inverter (172) can control power supplied to the first phase (a) using the first switch (401) and the fourth switch (404). The first switch (401) and the fourth switch (404) can be classified into one first group.

For example, the inverter (172) can control power supplied to the second phase (b) using the second switch (402) and the fifth switch (405). The second switch (402) and the fifth switch (405) can be classified into one second group.

For example, the inverter (172) can control power supplied to the third phase (c) using the third switch (403) and the sixth switch (406). The third switch (403) and the sixth switch (406) can be classified into one third group.

The inverter (172) can supply power for each phase to the motor (173). The inverter (172) can supply three-phase power to the motor (173) using six switches (401, 402, 403, 404, 405, 406). The motor (173) can be a PMSM (Permanent Magnet Synchronous Motor). The PMSM can be a motor that uses AC power that is controlled based on a magnetic field generated using a permanent magnet.

FIG. 5 is a diagram for explaining an operation of generating a PWM (Pulse Width Modulation) signal according to one embodiment.

Example (500) of Fig. 5 shows an operation in which a PWM control unit (131) generates a PWM signal. The PWM control unit (131) can use a carrier wave (510) and a reference wave (520) when supplying power.

The carrier wave (510) may be described as a carrier signal, a carrier wave, a carrier signal, a first type wave, etc. The carrier wave (510) may be a triangular carrier wave.

The reference wave (520) may be described as a reference signal, a reference wave, a reference signal, a reference wave, a reference signal, a second type of wave, etc. The reference wave (520) may be a waveform used to generate a PWM signal that matches the output desired by the user. The reference wave (520) may be an input signal.

The PWM control unit (131) can generate a PWM signal by comparing the size of the carrier wave (510) and the size of the reference wave (510).

The PWM control unit (131) can generate a PWM signal so that the size becomes 1 (or high) when the size of the reference wave (520) is greater than or equal to the size of the carrier wave (510). The size of the PWM signal can be defined between 0 and 1.

The PWM control unit (131) can generate a PWM signal so that the size of the reference wave (520) becomes 0 (or low) when the size of the carrier wave (510) is smaller.

The inverter (172) may include a DC power supply and a plurality of switches (401, 402, 403, 404, 405, 406).

One end (i0) of the DC power supply can be connected to one end (i1) of the first switch (401), one end (i2) of the second switch (402), and one end (i3) of the third switch (403) via the node (n1).

The other terminal (o0) of the DC power supply can be connected to the other terminal (o4) of the fourth switch (404), the other terminal (o5) of the fifth switch (405), and the other terminal (o6) of the sixth switch (406) via the node (n2).

The first phase of the motor (173) can be connected to the other end (o1) of the first switch (401) and one end (i4) of the fourth switch (404) via the node (a).

The second phase of the motor (173) can be connected to the other end (o2) of the second switch (402) and one end (i5) of the fifth switch (405) via the node (b).

The third phase of the motor (173) can be connected to the other end (o3) of the third switch (403) and one end (i6) of the sixth switch (406) via the node (c).

Controlling the switch to an on state may include controlling the switch to a shorted state. Controlling the switch to an off state may include controlling the switch to an open state.

The first switch (401) and the fourth switch (404) can be classified into the first group connected to the first phase of the motor (173).

The second switch (402) and the fifth switch (405) can be classified into a second group connected to the second phase of the motor (173).

The third switch (403) and the sixth switch (406) can be classified into the third group connected to the third phase of the motor (173).

The first switch (401), the second switch (402), and the third switch (403) can be classified as upper switches of the inverter (172).

The fourth switch (404), the fifth switch (405), and the fifth switch (405) can be classified as lower switches of the inverter (172).

The ON/OFF state of each of the upper switches (401, 402, 403) may be opposite to the ON/OFF state of each of the lower switches (404, 405, 406).

For example, if the first switch (401) is in the ON state, the fourth switch (404) may be in the OFF state. If the first switch (401) is in the OFF state, the fourth switch (404) may be in the ON state.

For example, if the second switch (402) is in the ON state, the fifth switch (405) may be in the OFF state. If the second switch (402) is in the OFF state, the fifth switch (405) may be in the ON state.

For example, if the third switch (403) is in the ON state, the sixth switch (406) may be in the OFF state. If the third switch (403) is in the OFF state, the sixth switch (406) may be in the ON state.

The electronic device (100) can control the first switch (401) to the ON state when transmitting a HIGH (or 1) signal of PWM to the first phase of the motor (173). The electronic device (100) can control the fourth switch (404) to the OFF state when transmitting a LOW (or 0) signal of PWM to the first phase of the motor (173).

The electronic device (100) can control the second switch (402) to the ON state when transmitting a HIGH (or 1) signal of PWM to the second phase of the motor (173). The electronic device (100) can control the fifth switch (405) to the OFF state when transmitting a LOW (or 0) signal of PWM to the first phase of the motor (173).

The electronic device (100) can control the third switch (403) to the ON state when transmitting a HIGH (or 1) signal of PWM to the third phase of the motor (173). The electronic device (100) can control the fifth switch (405) to the OFF state when transmitting a LOW (or 0) signal of PWM to the first phase of the motor (173).

FIG. 6 is a diagram for explaining a Space Vector Pulse Width Modulation (SVPWM) control operation according to one embodiment.

The embodiment (610) of Fig. 6 can represent a process of determining the size of a PWM signal using a space vector. The PWM control unit (131) can determine vectors (V1, V2, V3, V4, V5, V6) at 60-degree intervals based on V0 and V7. The PWM control unit (131) can generate a PWM signal corresponding to the space vector using V0 to V6. The PWM control unit (131) can control a PWM signal supplied to three phases using a space vector. The PWM control unit (131) can determine the pulse width of the PWM signal supplied to three phases according to each vector.

The numbers (x, y, z) described in each vector can represent the on/off state of each of the first switch (401), the second switch (402), and the third switch (403).

For example, V0(0,0,0) may indicate that the first switch (401), the second switch (402), and the third switch (403) are all turned off.

For example, V1(1,0,0) may indicate that the first switch (401) is in an ON state and the second switch (402) and the third switch (403) are in an OFF state.

For example, V2(1,1,0) may indicate that the first switch (401) and the second switch (402) are in an ON state and the third switch (403) is in an OFF state.

For example, V3(0,1,0) may indicate that the second switch (402) is in an ON state and the first switch (401) and the third switch (403) are in an OFF state.

For example, V4(0,1,1) may indicate that the second switch (402) and the third switch (403) are in an ON state and the first switch (401) is in an OFF state.

For example, V5(0,0,1) may indicate that the third switch (403) is in an ON state and the first switch (401) and the second switch (402) are in an OFF state.

For example, V6(1,0,1) may indicate that the first switch (401) and the third switch (403) are in an ON state, and the second switch (402) is in an OFF state.

For example, V7(1,1,1) may indicate that the first switch (401), the second switch (402), and the third switch (403) are in an ON state.

The embodiment (620) of Fig. 6 can represent a PWM signal supplied to three phases using a space vector. The first pulse width of the PWM signal supplied to the first phase (a) can be greater than the second pulse width of the PWM signal supplied to the second phase (b). The second pulse width of the PWM signal supplied to the second phase (b) can be greater than the third pulse width of the PWM signal supplied to the third phase (c).

FIG. 7 is a diagram for explaining SVPWM control operation according to one embodiment.

The embodiment (700) of Fig. 7 can represent various waveforms related to SVPWM.

The waveform (710) may include a sine wave component.

The waveform (720) may include a common mode component. The common mode component may represent noise generated in the PWM control unit (131).

Waveform (730) may represent THIPWM (Third Harmonic Injection Pulse Width Modulation). THIPWM may represent a PWM signal generated by injecting a harmonic frequency that is three times the fundamental frequency.

SVPWM can generate heat due to increased switching loss. To solve the heat generation problem of SVPWM, the electronic device (100) can control the inverter (172) using a DPWM method that reduces switching loss and improves energy efficiency.

FIG. 8 is a diagram for explaining a DPWM (Discontinuous Pulse Width Modulation) control operation according to one embodiment.

The embodiment (810) of Fig. 8 can represent a process of determining the size of a PWM signal using a space vector. The PWM control unit (131) can determine vectors (V1, V2, V3, V4, V5, V6) at 60-degree intervals based on V0. The PWM control unit (131) can generate a PWM signal corresponding to the space vector using V0 to V6. The PWM control unit (131) can control a PWM signal supplied to three phases using the space vector. The PWM control unit (131) can determine the pulse width of the PWM signal supplied to three phases according to each vector.

The embodiment (820) of Fig. 8 can represent a PWM signal supplied to three phases using a space vector. The first pulse width of the PWM signal supplied to the first phase (a) can be greater than the second pulse width of the PWM signal supplied to the second phase (b). The PWM signal supplied to the third phase (c) can be supplied with a constant size (e.g., -Vdc). According to an implementation example, the size of the PWM signal supplied to the third phase (c) can be 0.

FIG. 9 is a diagram for explaining a DPWM control operation according to one embodiment.

Embodiment (900) of Fig. 9 may represent 120 degree DPWM. 120 degree DPWM may represent a method of maintaining a PWM signal for one of three phases at Low (or a specific value).

Waveform (910) may represent a PWM signal for the first phase (a). Waveform (920) may represent a PWM signal for the second phase (b). Waveform (930) may represent a PWM signal for the third phase (c). Discontinuity of the PWM signal may occur depending on load changes, component characteristics, frequency changes, and implementation methods of the control system.

When the minimum pulse width limit is applied in relation to the DPWM control operation, discontinuity may occur and abnormal noise may be output. Abnormal noise is caused by harmonics that are applied when the minimum pulse width is limited. Harmonics may be generated based on harmonics other than the fundamental wave component. It is necessary to minimize harmonic components in order to reduce noise. If the minimum pulse width is forcibly limited, abnormal noise may be additionally measured.

FIG. 10 is a diagram for explaining an operation of controlling DPWM without a minimum pulse width limitation according to one embodiment.

Embodiment (1010) of Fig. 10 can represent the duty ratio of 120 degree DPWM. Each waveform expressed in embodiment (1010) can represent the waveform of a reference signal in three phases. A smaller duty ratio can mean a smaller supplied voltage.

The time point (t1) may be the time point at which the duty ratio of the PWM signal (Van) for the first phase (a) exceeds 0% and becomes 0%. The time point (t1) may be the time point at which the duty ratio of the PWM signal (Van) for the first phase (a) decreases and becomes 0%.

Time point (t2) may be a time point when the duty ratio of the PWM signal (Vbn) for the second phase (b) exceeds 0% and becomes 0%. Time point (t2) may be a time point when the duty ratio of the PWM signal (Vbn) for the second phase (b) decreases and becomes 0%.

Time point (t3) may be a time point when the duty ratio of the PWM signal (Vcn) for the third phase (c) exceeds 0% and becomes 0%. Time point (t3) may be a time point when the duty ratio of the PWM signal (Vcn) for the third phase (c) decreases and becomes 0%.

The duty ratio of the PWM signal (Van) for the first phase (a) can decrease up to time point (t1). The duty ratio of the PWM signal (Van) at time point (0) can be greater than the duty ratio of the PWM signal (Van) at time point (t1).

The duty ratio of the PWM signal (Van) for the first phase (a) can be maintained from time point (t1) to time point (t2). The duty ratio of the PWM signal (Van) for the first phase (a) can be 0% from time point (t1) to time point (t2).

The duty ratio of the PWM signal (Van) for the first phase (a) may increase from time point (t2). The duty ratio of the PWM signal (Van) at time point (t2) may be smaller than the duty ratio of the PWM signal (Van) at time point (t3).

The duty ratio of the PWM signal (Vbn) for the second phase (b) can decrease until time point (t2). The duty ratio of the PWM signal (Vbn) at time point (t1) can be greater than the duty ratio of the PWM signal (Vbn) at time point (t2).

The duty ratio of the PWM signal (Vbn) for the second phase (b) can be maintained from time point (t2) to time point (t3). The duty ratio of the PWM signal (Vbn) for the second phase (b) can be 0% from time point (t2) to time point (t3).

The duty ratio of the PWM signal (Vbn) for the second phase (b) can increase from time point (t3).

The duty ratio of the PWM signal (Vcn) for the third phase (c) can decrease up to time point (t3). The duty ratio of the PWM signal (Vcn) at time point (t2) can be greater than the duty ratio of the PWM signal (Vcn) at time point (t3).

The duty ratio of the PWM signal (Vcn) for the third phase (c) can be maintained from time point (t3). The duty ratio of the PWM signal (Vcn) for the third phase (c) can be 0% from time point (t3).

The duty ratio of the PWM signal (Vcn) for the third phase (c) can increase from time point (t1). The duty ratio of the PWM signal (Vcn) at time point (t1) can be smaller than the duty ratio of the PWM signal (Vcn) at time point (t2).

A description of the area (1011) related to time point (t1) is described in Fig. 11.

Embodiment (1020) of Fig. 10 can represent PWM signals for each of the three phases corresponding to embodiment (1010).

The duty ratio of the PWM signal (Van) for phase 1 (a) can be 0% from time point (t1) to time point (t2).

The duty ratio of the PWM signal (Vbn) for the second phase (b) can be 0% from time point (t2) to time point (t3).

The duty ratio of the PWM signal (Vcn) for the third phase (c) can be 0% from time point (t3).

FIG. 11 is a diagram for explaining an operation of identifying a target time according to a minimum pulse width limitation, according to one embodiment.

Embodiments (1110, 1120, 1130) of FIG. 11 can represent an operation of obtaining a target time based on a PWM signal for each phase.

The electronic device (100) can obtain minimum pulse width information. According to one embodiment, the minimum pulse width information can include a minimum duty ratio for the minimum pulse width. The electronic device (100) can obtain a minimum duty ratio (d_min) included in the minimum pulse width information. The minimum duty ratio (d_min) can be described as a threshold duty ratio, a first duty ratio, a first threshold duty ratio, etc. The electronic device (100) can identify a time when the PWM signal is less than or equal to the minimum duty ratio (d_min). The time can be described as a time interval, a time domain, etc.

Referring to embodiment (1110), the electronic device (100) can identify a target time (ta12) at which the PWM signal (Van) for the first phase (a) becomes less than or equal to the minimum duty ratio (d_min).

The electronic device (100) can identify the point in time (ta1, ta2) at which the PWM signal (Van) for the first phase (a) reaches the minimum duty ratio (d_min).

The time point (ta1) may be the start time of the target time (ta12). The time point (ta1) may be the time point at which the duty ratio of the PWM signal (Van) for the first phase (a) is greater than the minimum duty ratio (d_min) and changes to the minimum duty ratio (d_min). The electronic device (100) may identify the time point (ta1) at which the duty ratio of the PWM signal (Van) for the first phase (a) becomes the minimum duty ratio (d_min) while the duty ratio of the PWM signal (Van) for the first phase (a) decreases.

The time point (ta2) may be the end time point of the target time (ta12). The time point (ta2) may be the time point at which the duty ratio of the PWM signal (Van) for the first phase (a) changes from being less than the minimum duty ratio (d_min) to the minimum duty ratio (d_min). The electronic device (100) may identify the time point (ta2) at which the duty ratio of the PWM signal (Van) for the first phase (a) becomes the minimum duty ratio (d_min) while the duty ratio of the PWM signal (Van) for the first phase (a) increases.

The electronic device (100) can identify the time from time point (ta1) to time point (ta2) as the target time (ta12).

Referring to embodiment (1120), the electronic device (100) can identify a target time (tb12) at which the PWM signal (Vbn) for the second phase (b) becomes less than or equal to the minimum duty ratio (d_min).

The electronic device (100) can identify the point in time (tb1, tb2) at which the PWM signal (Vbn) for the second phase (b) reaches the minimum duty ratio (d_min).

The time point (tb1) may be the start time of the target time (tb12). The time point (tb1) may be the time point at which the duty ratio of the PWM signal (Vbn) for the second phase (b) is greater than the minimum duty ratio (d_min) and changes to the minimum duty ratio (d_min). The electronic device (100) may identify the time point (tb1) at which the duty ratio of the PWM signal (Vbn) for the second phase (b) becomes the minimum duty ratio (d_min) while the duty ratio of the PWM signal (Vbn) for the second phase (b) decreases.

The time point (tb2) may be the end time point of the target time (tb12). The time point (tb2) may be the time point at which the duty ratio of the PWM signal (Vbn) for the second phase (b) changes from being less than the minimum duty ratio (d_min) to the minimum duty ratio (d_min). The electronic device (100) may identify the time point (tb2) at which the duty ratio of the PWM signal (Vbn) for the second phase (b) becomes the minimum duty ratio (d_min) while the duty ratio of the PWM signal (Vbn) for the second phase (b) increases.

The electronic device (100) can identify the time from time (tb1) to time (tb2) as the target time (tb12).

Referring to embodiment (1130), the electronic device (100) can identify a target time (tc12) at which the PWM signal (Vcn) for the third phase (c) becomes less than or equal to the minimum duty ratio (d_min).

The electronic device (100) can identify the time point (tc1, tc2) at which the PWM signal (Vcn) for the third phase (c) reaches the minimum duty ratio (d_min).

The time point (tc1) may be the start time of the target time (tc12). The time point (tc1) may be the time point at which the duty ratio of the PWM signal (Vcn) for the third phase (c) changes from being greater than the minimum duty ratio (d_min) to the minimum duty ratio (d_min). The electronic device (100) may identify the time point (tc1) at which the duty ratio of the PWM signal (Vcn) for the third phase (c) becomes the minimum duty ratio (d_min) while the duty ratio of the PWM signal (Vcn) for the third phase (c) decreases.

The time point (tc2) may be the end time point of the target time (tc12). The time point (tc2) may be the time point at which the duty ratio of the PWM signal (Vcn) for the third phase (c) changes from being less than the minimum duty ratio (d_min) to the minimum duty ratio (d_min). The electronic device (100) may identify the time point (tc2) at which the duty ratio of the PWM signal (Vcn) for the third phase (c) becomes the minimum duty ratio (d_min) while the duty ratio of the PWM signal (Vcn) for the third phase (c) increases.

The electronic device (100) can identify the time from time (tc1) to time (tc2) as the target time (tc12).

In embodiment (1130), time point (tc2) is described as being faster than time point (tc1), but this is only described as a one-cycle waveform. In practice, time point (tc2) may be slower than time point (tc1).

FIG. 12 is a diagram for explaining an operation of controlling DPWM by applying a minimum pulse width limitation according to one embodiment.

Embodiment (1210) of Fig. 12 can represent the duty ratio of 120 degree DPWM. In this regard, it can correspond to embodiment (1010) of Fig. 10 and embodiments (1110, 1120, 1130) of Fig. 11. Duplicate explanation is omitted.

Embodiment (1210) of Fig. 12 may apply a minimum pulse width limitation. The minimum pulse width limitation may indicate that the minimum duty ratio of the PWM signal is limited so as not to fall within a critical range. The minimum pulse width limitation may be necessary to secure the stability of the circuit. This is because if the pulse width is too small, it is difficult for the switch to operate normally.

For example, if the duty ratio for the PWM signal is greater than 0% and less than or equal to the minimum duty ratio (d_min), the electronic device (100) can maintain the duty ratio for the PWM signal at the minimum duty ratio (d_min). The minimum pulse width limitation may not limit the duty ratio to 0%.

Embodiment (1220) of Fig. 12 can represent PWM signals for each of the three phases corresponding to embodiment (1210).

In FIG. 10, the electronic device (100) can generate a PWM signal to which a minimum pulse width limitation is not applied.

In FIG. 12, the electronic device (100) can generate a PWM signal with a minimum pulse width limitation applied.

The electronic device (100) can maintain the duty ratio of the PWM signal (Van) for the first phase (a) at the minimum duty ratio (d_min) from time point (ta1) to time point (t1).

The electronic device (100) can maintain the duty ratio of the PWM signal (Van) for the first phase (a) at 0% from time point (t1) to time point (t2).

The electronic device (100) can maintain the duty ratio of the PWM signal (Van) for the first phase (a) at the minimum duty ratio (d_min) from time point (t2) to time point (ta2).

The electronic device (100) can maintain the duty ratio of the PWM signal (Vbn) for the second phase (b) at the minimum duty ratio (d_min) from time point (tb1) to time point (t2).

The electronic device (100) can maintain the duty ratio of the PWM signal (Vbn) for the second phase (b) at 0% from time point (t2) to time point (t3).

The electronic device (100) can maintain the duty ratio of the PWM signal (Vbn) for the second phase (b) at the minimum duty ratio (d_min) from time point (t3) to time point (tb2).

The electronic device (100) can maintain the duty ratio of the PWM signal (Vcn) for the third phase (c) at the minimum duty ratio (d_min) from time point (tc1) to time point (t3).

The electronic device (100) can maintain the duty ratio of the PWM signal (Vcn) for the third phase (c) at 0% from time point (t3) to time point (t1).

The electronic device (100) can maintain the duty ratio of the PWM signal (Vcn) for the third phase (c) at the minimum duty ratio (d_min) from time point (t1) to time point (tc2).

FIG. 13 is a diagram for explaining an operation of controlling DPWM using minimum pulse width limitation and switching control according to one embodiment.

Embodiment (1310) of Fig. 13 can represent a duty ratio of 120 degree DPWM. In this regard, it can correspond to embodiment (1010) of Fig. 10 and embodiments (1110, 1120, 1130) of Fig. 11. Duplicate explanation is omitted.

The embodiment (1310) of Fig. 13 may apply a minimum pulse width limitation. The minimum pulse width limitation may indicate that the minimum duty ratio of the PWM signal is limited so as not to fall within a critical range. For example, when the duty ratio for the PWM signal is greater than 0% and less than or equal to the minimum duty ratio (d_min), the electronic device (100) may control the switch for the PWM signal to be in an off state. The minimum pulse width limitation may not limit the duty ratio to be 0%.

Embodiment (1320) of Fig. 13 can represent PWM signals for each of the three phases corresponding to embodiment (1310).

The electronic device (100) can control the switch corresponding to the identified duty ratio to be in the off state if the identified duty ratio is less than or equal to the minimum duty ratio (d_min).

The electronic device (100) can control the first switch (S1, 401) corresponding to the first phase (a) to be in the OFF state from the time point (ta1) to the time point (ta2). The electronic device (100) can control the first switch (S1, 401) to be in the OFF state during the target time (ta12).

The electronic device (100) can control the second switch (S2, 402) corresponding to the second phase (b) to be in the OFF state from the time point (tb1) to the time point (tb2). The electronic device (100) can control the second switch (S2, 402) to be in the OFF state during the target time (tb12).

The electronic device (100) can control the third switch (S3, 403) corresponding to the third phase (c) to be in the OFF state from the time point (tc1) to the time point (tc2). The electronic device (100) can control the third switch (S3, 403) to be in the OFF state during the target time (tc12).

FIG. 14 is a diagram for explaining an operation of controlling DPWM using minimum pulse width limitation and switching control according to one embodiment.

Embodiment (1410) of Fig. 14 can represent the duty ratio of 120 degree DPWM. In this regard, it can correspond to embodiment (1310) of Fig. 13 and embodiments (1110, 1120, 1130) of Fig. 11. Duplicate explanation is omitted.

Unlike the embodiment (1310) of Fig. 13, the embodiment (1410) of Fig. 14 may apply a maximum duty ratio (d_max). The maximum duty ratio (d_max) may be described as a threshold duty ratio, a second duty ratio, a second threshold duty ratio, etc. The electronic device (100) may obtain the maximum duty ratio (d_max) by subtracting the minimum duty ratio (d_min) from the duty ratio of 100%. For example, if the minimum duty ratio (d_min) is 10%, the maximum duty ratio (d_max) may be 90%.

The electronic device (100) can control the switch corresponding to the identified duty ratio to be turned on if the identified duty ratio is greater than or equal to the maximum duty ratio (d_max).

The electronic device (100) can control the first switch (S1, 401) corresponding to the first phase (a) to be turned on from a time point (ta3) to a time point (ta4). The electronic device (100) can control the first switch (S1, 401) corresponding to the first phase (a) to be turned on from a time point (ta5) to a time point (ta6). The electronic device (100) can control the first switch (S1, 401) to be turned on during a target time (ta34) and a target time (ta56).

The electronic device (100) can control the second switch (S2, 402) corresponding to the second phase (b) to be turned on from the time point (tb3) to the time point (tb4). The electronic device (100) can control the second switch (S2, 402) corresponding to the second phase (b) to be turned on from the time point (tb5) to the time point (tb6). The electronic device (100) can control the second switch (S2, 402) to be turned on during the target time (tb34) and the target time (tb56).

The electronic device (100) can control the third switch (S3, 403) corresponding to the third phase (c) to be turned on from the time point (tc3) to the time point (tc4). The electronic device (100) can control the second switch (S2, 402) corresponding to the third phase (c) to be turned on from the time point (tc5) to the time point (tc6). The electronic device (100) can control the third switch (S3, 403) to be turned on during the target time (tc34) and the target time (tc56).

FIG. 15 is a drawing for explaining an operation of controlling a switch using a minimum duty ratio according to one embodiment.

Referring to FIG. 15, the electronic device (100) can obtain the PWM duty ratio of the PWM signal supplied to the motor (173) (S1510). The PWM duty ratio can be described as duty ratio.

The electronic device (100) can receive minimum pulse width information. The electronic device (100) can obtain a minimum duty ratio based on the minimum pulse width information (S1520).

The electronic device (100) can obtain a target time at which a PWM duty ratio is output below a minimum duty ratio (S1530). The electronic device (100) can analyze the PWM duty ratio and identify the duty ratio in real time. The electronic device (100) can compare the identified PWM duty ratio with the minimum duty ratio. The electronic device (100) can determine the time at which the PWM duty ratio is below the minimum duty ratio as the target time.

The electronic device (100) can control the switch based on the target time (S1540). The operation of controlling the switch can include an operation of controlling the switch to an OFF state during the target time.

FIG. 16 is a drawing for explaining an operation of controlling a switch using a minimum duty ratio according to one embodiment.

Steps S1610, S1620, S1630, and S1640 of Fig. 16 may correspond to steps S1510, S1520, S1530, and S1540 of Fig. 15. Duplicate description is omitted.

The electronic device (100) can obtain minimum pulse width information (S1605). The electronic device (100) can generate a PWM signal by maintaining the minimum pulse width. To maintain the minimum pulse width, the electronic device (100) can use the minimum pulse width information. The minimum pulse width information can be changed according to user settings, etc.

The electronic device (100) can obtain a PWM duty ratio corresponding to the first phase (S1610).

The electronic device (100) can obtain the minimum duty ratio (d_min) based on the minimum pulse width information (S1620). The electronic device (100) can identify the first target time (ta12) in which the PWM duty ratio of the first phase is less than or equal to the minimum duty ratio (d_min) (S1630). The electronic device (100) can obtain the PWM duty ratio of the first phase in real time. The electronic device (100) can identify the time in which the PWM duty ratio of the first phase is less than or equal to the minimum duty ratio (d_min) as the target time (ta12). There can be a plurality of target times.

The electronic device (100) can control the first switch (401) corresponding to the first phase to be OFF during the first target time (ta12). The electronic device (100) can control the first switch (401) to be open. The electronic device (100) can control the fourth switch (404) corresponding to the first phase to be ON during the first target time (ta12).

The above-described operation can be equally applied to the second and third phases.

For example, the electronic device (100) can identify a second target time (tb12) in which the PWM duty ratio of the second phase is less than or equal to the minimum duty ratio (d_min). The electronic device (100) can control the second switch (402) corresponding to the second phase to an OFF state during the second target time (tb12). The electronic device (100) can control the fifth switch (405) corresponding to the second phase to an ON state during the second target time (tb12).

For example, the electronic device (100) can identify a third target time (tc12) in which the PWM duty ratio of the third phase is less than or equal to the minimum duty ratio (d_min). The electronic device (100) can control the third switch (403) corresponding to the third phase to an OFF state during the third target time (tc12). The electronic device (100) can control the sixth switch (406) corresponding to the third phase to an ON state during the third target time (tc12).

FIG. 17 is a drawing for explaining an operation of controlling a switch using a minimum duty ratio according to one embodiment.

Steps S1710 and S1720 of Fig. 17 may correspond to steps S1610 and S1620 of Fig. 16. Duplicate description is omitted.

The electronic device (100) can obtain minimum pulse width information (S1705). The electronic device (100) obtains minimum pulse width information based on user input. The electronic device (100) can store preset minimum pulse width information in the memory (140).

The electronic device (100) can obtain a PWM duty ratio corresponding to the first phase (S1710). The electronic device (100) can obtain a minimum duty ratio (d_min) based on minimum pulse width information (S1720).

The electronic device (100) can identify a first point in time (ta1) at which the PWM duty ratio of the first phase changes to the minimum duty ratio (d_min) while the PWM duty ratio of the first phase is greater than the minimum duty ratio (d_min) (S1731). The electronic device (100) can determine the point in time at which the PWM duty ratio of the first phase decreases and becomes the minimum duty ratio (d_min) as the first point in time (ta1).

The electronic device (100) can identify a second time point (ta2) at which the PWM duty ratio of the first phase changes to the minimum duty ratio (d_min) when the PWM duty ratio of the first phase is smaller than the minimum duty ratio (d_min) (S1732). The electronic device (100) can determine the time point at which the PWM duty ratio of the first phase increases and becomes the minimum duty ratio (d_min) as the second time point (ta2).

The electronic device (100) can determine the period from the first time point (ta1) to the second time point (ta2) as the first target time (ta12). The electronic device (100) can control the first switch (401) corresponding to the first phase to the OFF state during the first target time (ta12).

The electronic device (100) can change the first switch (401) corresponding to the first phase from the ON state to the OFF state at the first time point (ta1) (S1741). The electronic device (100) can change the fourth switch (404) corresponding to the first phase from the OFF state to the ON state at the first time point (ta1).

The electronic device (100) can keep the first switch (401) corresponding to the first phase in the OFF state from the first time point (ta1) to the second time point (ta2) (S1742). The electronic device (100) can keep the fourth switch (404) corresponding to the first phase in the ON state from the first time point (ta1) to the second time point (ta2).

The electronic device (100) can change the first switch (401) corresponding to the first phase from the OFF state to the ON state at the second time point (ta2) (S1743). The electronic device (100) can change the fourth switch (404) corresponding to the first phase from the ON state to the OFF state at the second time point (ta2).

The above-described operation can be equally applied to the second phase.

The electronic device (100) can identify a third time point (tb1) at which the PWM duty ratio of the second phase changes to the minimum duty ratio (d_min) while the PWM duty ratio of the second phase is greater than the minimum duty ratio (d_min).

The electronic device (100) can identify a fourth time point (tb2) at which the PWM duty ratio of the second phase changes to the minimum duty ratio (d_min) while the PWM duty ratio of the second phase is less than the minimum duty ratio (d_min).

The electronic device (100) can change the second switch (402) corresponding to the second phase from the ON state to the OFF state at the third time point (tb1). The electronic device (100) can change the fifth switch (405) corresponding to the second phase from the OFF state to the ON state at the third time point (tb1).

The electronic device (100) can keep the second switch (402) corresponding to the second phase in the OFF state from the third time point (tb1) to the fourth time point (tb2). The electronic device (100) can keep the fifth switch (405) corresponding to the second phase in the ON state from the third time point (tb1) to the fourth time point (tb2).

The electronic device (100) can change the second switch (402) corresponding to the second phase from the OFF state to the ON state at the fourth time point (tb2). The electronic device (100) can change the fifth switch (405) corresponding to the second phase from the ON state to the OFF state at the fourth time point (tb2).

The above-described operation can be equally applied to the third phase.

The electronic device (100) can identify a fifth time point (tc1) at which the PWM duty ratio of the third phase changes to the minimum duty ratio (d_min) while the PWM duty ratio of the third phase is greater than the minimum duty ratio (d_min).

The electronic device (100) can identify a sixth time point (tc2) at which the PWM duty ratio of the third phase changes to the minimum duty ratio (d_min) when the PWM duty ratio of the third phase is less than the minimum duty ratio (d_min).

The electronic device (100) can change the third switch (403) corresponding to the third phase from the ON state to the OFF state at the fifth time point (tc1). The electronic device (100) can change the sixth switch (406) corresponding to the third phase from the OFF state to the ON state at the fifth time point (tc1).

The electronic device (100) can keep the third switch (403) corresponding to the third phase in the OFF state from the fifth time point (tc1) to the sixth time point (tc2). The electronic device (100) can keep the sixth switch (406) corresponding to the third phase in the ON state from the fifth time point (tc1) to the sixth time point (tc2).

The electronic device (100) can change the third switch (403) corresponding to the third phase from the OFF state to the ON state at the sixth time point (tc2). The electronic device (100) can change the sixth switch (406) corresponding to the third phase from the ON state to the OFF state at the sixth time point (tc2).

FIG. 18 is a drawing for explaining an operation of controlling a switch using a maximum duty ratio according to one embodiment.

Steps S1805, S1810, S1820, S1830, and S1840 of FIG. 18 may correspond to steps S1605, S1610, S1620, S1630, and S1640 of FIG. 16.

The electronic device (100) can control the switch using the maximum duty ratio (d_max) separately from the operation of controlling the first switch (401) corresponding to the first phase to the off state during the first target time (ta12).

The electronic device (100) can obtain the maximum duty ratio (d_max) by subtracting the minimum duty ratio (d_min) from the PWM duty ratio of 100% (S1850). The minimum duty ratio (d_min) may be described as a first threshold duty ratio, a first duty ratio, etc. The maximum duty ratio (d_max) may be described as a second threshold duty ratio, a second duty ratio, etc. The minimum duty ratio (d_min) may be smaller than the maximum duty ratio (d_max). The first threshold duty ratio may be smaller than the second threshold duty ratio.

The electronic device (100) can identify a fourth target time (ta34) in which the PWM duty ratio of the first phase is greater than or equal to the maximum duty ratio (d_max) (S1860). The electronic device (100) can obtain the PWM duty ratio of the first phase in real time. The electronic device (100) can identify a time in which the PWM duty ratio of the first phase is greater than or equal to the maximum duty ratio (d_max) as the fourth target time (ta34). There can be a plurality of target times.

The electronic device (100) can control the first switch (401) corresponding to the first phase to the ON state during the fourth target time (ta34) (S1870). The electronic device (100) can control the fourth switch (404) corresponding to the first phase to the OFF state during the fourth target time (ta34).

The above-described operation can be equally applied to the second and third phases.

For example, the electronic device (100) can identify a fifth target time (tb34) during which the PWM duty ratio of the second phase is greater than or equal to the maximum duty ratio (d_max). The electronic device (100) can control the second switch (402) corresponding to the second phase to be in an ON state during the fifth target time (tb34). The electronic device (100) can control the fifth switch (405) corresponding to the second phase to be in an OFF state during the fifth target time (tb34).

For example, the electronic device (100) can identify a sixth target time (tc34) at which the PWM duty ratio of the third phase is greater than or equal to the maximum duty ratio (d_max). The electronic device (100) can control the third switch (403) corresponding to the third phase to be in an ON state during the sixth target time (tc34). The electronic device (100) can control the sixth switch (406) corresponding to the third phase to be in an OFF state during the sixth target time (tc34).

The operation of calculating the target time using the maximum duty ratio (d_max) is described in Fig. 14.

FIG. 19 is a drawing for explaining an operation of controlling a switch using a maximum duty ratio according to one embodiment.

Referring to FIG. 19, an operation utilizing the maximum duty ratio (d_max) may be additionally performed separately from steps S1705, S1710, S1720, S1731, S1732, S1741, S1742, and S1743 of FIG. 17.

The electronic device (100) can obtain the maximum duty ratio (d_max) by subtracting the minimum duty ratio (d_min) from the PWM duty ratio of 100% (S1950).

The electronic device (100) can identify a seventh time point (ta3) at which the PWM duty ratio of the first phase changes from a state where the PWM duty ratio of the first phase is smaller than the maximum duty ratio (d_max) to the maximum duty ratio (d_max) (S1961). The electronic device (100) can determine a time point at which the PWM duty ratio of the first phase increases and becomes the maximum duty ratio (d_max) as the seventh time point (ta3).

The electronic device (100) can identify the eighth time point (ta4) at which the PWM duty ratio of the first phase changes to the maximum duty ratio (d_max) while the PWM duty ratio of the first phase is greater than the maximum duty ratio (d_max) (S1962). The electronic device (100) can determine the time point at which the PWM duty ratio of the first phase decreases and becomes the maximum duty ratio (d_max) as the eighth time point (ta4).

The electronic device (100) can determine the period from the seventh time point (ta3) to the eighth time point (ta4) as the fourth target time (ta34). The electronic device (100) can control the first switch (401) corresponding to the first phase to the ON state during the fourth target time (ta34).

The electronic device (100) can change the first switch (401) corresponding to the first phase from the OFF state to the ON state at the seventh time point (ta3) (S1971). The electronic device (100) can change the fourth switch (404) corresponding to the first phase from the ON state to the OFF state at the seventh time point (ta3).

The electronic device (100) can keep the first switch (401) corresponding to the first phase in the ON state from the seventh time point (ta3) to the eighth time point (ta4) (S1972). The electronic device (100) can keep the fourth switch (404) corresponding to the first phase in the OFF state from the seventh time point (ta3) to the eighth time point (ta4).

The electronic device (100) can change the first switch (401) corresponding to the first phase from the ON state to the OFF state at the eighth time point (ta4) (S1973). The electronic device (100) can change the fourth switch (404) corresponding to the first phase from the OFF state to the ON state at the eighth time point (ta4).

According to various embodiments, at the seventh time point (ta3), the first switch (401) may be in the ON state instead of the OFF state. If the first switch (401) is in the ON state at the seventh time point (ta3), the electronic device (100) may maintain the first switch (401) in the ON state.

According to various embodiments, the first switch (401) may be controlled to the ON state after the eighth time point (ta4). When the first switch (401) is controlled to the ON state after the eighth time point (ta4), the electronic device (100) may maintain the first switch (401) in the ON state.

In various embodiments, steps S1971 and S1973 may be omitted.

The above-described operation can be equally applied to the second phase.

The electronic device (100) can identify a ninth point in time (tb3) at which the PWM duty ratio of the second phase changes from a state in which the PWM duty ratio of the second phase is less than the maximum duty ratio (d_max) to the maximum duty ratio (d_max).

The electronic device (100) can identify a tenth point in time (tb4) at which the PWM duty ratio of the second phase changes from a state in which the PWM duty ratio of the second phase is greater than the maximum duty ratio (d_max) to the maximum duty ratio (d_max).

The electronic device (100) can change the second switch (402) corresponding to the second phase from the ON state to the OFF state at the ninth time point (tb3). The electronic device (100) can change the fifth switch (405) corresponding to the second phase from the OFF state to the ON state at the ninth time point (tb3).

The electronic device (100) can keep the second switch (402) corresponding to the second phase in the OFF state from the ninth time point (tb3) to the tenth time point (tb4). The electronic device (100) can keep the fifth switch (405) corresponding to the second phase in the ON state from the ninth time point (tb3) to the tenth time point (tb4).

The electronic device (100) can change the second switch (402) corresponding to the second phase from the OFF state to the ON state at the 10th time point (tb4). The electronic device (100) can change the fifth switch (405) corresponding to the second phase from the ON state to the OFF state at the 10th time point (tb4).

The above-described operation can be equally applied to the third phase.

The electronic device (100) can identify an 11th point in time (tc3) at which the PWM duty ratio of the third phase changes from a state in which the PWM duty ratio of the third phase is less than the maximum duty ratio (d_max) to the maximum duty ratio (d_max).

The electronic device (100) can identify the 12th point in time (tc4) at which the PWM duty ratio of the third phase changes to the maximum duty ratio (d_max) while the PWM duty ratio of the third phase is greater than the maximum duty ratio (d_max).

The electronic device (100) can change the third switch (403) corresponding to the third phase from the ON state to the OFF state at the 11th time point (tc3). The electronic device (100) can change the sixth switch (406) corresponding to the third phase from the OFF state to the ON state at the 11th time point (tc3).

The electronic device (100) can keep the third switch (403) corresponding to the third phase in the OFF state from the 11th time point (tc3) to the 12th time point (tc4). The electronic device (100) can keep the sixth switch (406) corresponding to the third phase in the ON state from the 11th time point (tc3) to the 12th time point (tc4).

The electronic device (100) can change the third switch (403) corresponding to the third phase from the OFF state to the ON state at the 12th time point (tc4). The electronic device (100) can change the sixth switch (406) corresponding to the third phase from the ON state to the OFF state at the 12th time point (tc4).

FIG. 20 is a drawing for explaining a method for controlling an electronic device according to one embodiment.

Referring to FIG. 20, a control method of an electronic device (100) including a memory (140) storing a minimum duty ratio, an inverter (172) converting direct current power into alternating current power, and a motor (173), and transmitting the converted alternating current power to the motor (173) includes a step (S2010) of identifying a duty ratio of a PWM (Pulse Width Modulation) signal for controlling the inverter (172), and a step (S2020) of controlling a switch corresponding to the PWM signal among a plurality of switches included in the inverter (172) to an OFF state if the duty ratio of the PWM signal is less than or equal to the minimum duty ratio.

The control method further includes a step of obtaining a target time during which the duty ratio of the PWM signal is less than or equal to a minimum duty ratio, and the step of controlling the switch to an OFF state can control the switch to an OFF state during the target time.

The step of controlling the switch to an OFF state may include identifying a first point in time when the duty ratio of the PWM signal becomes the minimum duty ratio while the duty ratio of the PWM signal is greater than the minimum duty ratio, identifying a second point in time when the duty ratio of the PWM signal becomes the minimum duty ratio while the duty ratio of the PWM signal is less than the minimum duty ratio, and controlling the switch to an OFF state during a target time representing from the first point in time to the second point in time.

The step of controlling the switch to the OFF state can include changing the switch from the ON state to the OFF state at a first time point, maintaining the switch in the OFF state from the first time point to the second time point, and changing the switch from the OFF state to the ON state at the second time point.

The control method may include a step of obtaining a maximum duty ratio by subtracting a minimum duty ratio from a duty ratio of 100%, and a step of controlling a switch corresponding to the PWM signal to an ON state if the duty ratio of the PWM signal is greater than or equal to the maximum duty ratio.

The target time is a first target time, the control method further includes a step of obtaining a second target time in which a duty ratio of a PWM signal is greater than or equal to a maximum duty ratio, and the step of controlling the switch to an ON state can control the switch to an ON state during the second target time.

The step of controlling the switch to the ON state may include identifying a third point in time when the duty ratio of the PWM signal becomes the maximum duty ratio while the duty ratio of the PWM signal is smaller than the maximum duty ratio, identifying a fourth point in time when the duty ratio of the PWM signal becomes the maximum duty ratio while the duty ratio of the PWM signal is greater than the maximum duty ratio, and controlling the switch to the ON state during a second target time representing the third point in time to the fourth point in time.

The inverter (172) is a three-phase inverter (172), and the plurality of switches include a first switch (401), a second switch (402), a third switch (403), a fourth switch (404), a fifth switch (405), and a sixth switch (406), and the control method may further include a step of providing a first PWM signal corresponding to a first phase based on the first switch (401) and the fourth switch (404), a step of providing a second PWM signal corresponding to a second phase based on the second switch (402) and the fifth switch (405), and a step of providing a third PWM signal corresponding to a third phase based on the third switch (403) and the sixth switch (406).

The control method may further include a step of controlling the fourth switch (404) to an ON state when the first switch (401) is in an OFF state, a step of controlling the fifth switch (405) to an ON state when the second switch (402) is in an OFF state, and a step of controlling the sixth switch (406) to an ON state when the third switch (403) is in an OFF state.

The inverter (172) may be a three-phase inverter (172) that uses three DPWM (Discontinuous DPWM) signals spaced 120 degrees apart.

The methods according to various embodiments of the present disclosure described above can be implemented in the form of applications that can be installed on existing electronic devices.

The methods according to various embodiments of the present disclosure described above can be implemented only with a software upgrade or a hardware upgrade for an existing electronic device.

The various embodiments of the present disclosure described above may also be performed through an embedded server provided in an electronic device, or an external server of at least one of the electronic device and the display device.

According to an exemplary embodiment of the present disclosure, the various embodiments described above may be implemented as software including instructions stored in a machine-readable storage medium that can be read by a machine (e.g., a computer). The device may include an electronic device according to the disclosed embodiments, which is a device that calls instructions stored from the storage medium and can operate according to the called instructions. When the instructions are executed by the processor, the processor may perform a function corresponding to the instructions directly or by using other components under the control of the processor. The instructions may include codes generated or executed by a compiler or an interpreter. The machine-readable storage medium may be provided in the form of a non-transitory storage medium. Here, 'non-transitory' means that the storage medium does not include a signal and is tangible, and does not distinguish between data being stored semi-permanently or temporarily in the storage medium.

According to one embodiment of the present disclosure, the method according to the various embodiments described above may be provided as included in a computer program product. The computer program product may be traded between sellers and buyers as a commodity. The computer program product may be distributed in the form of a machine-readable storage medium (e.g., compact disc read only memory (CD-ROM)) or online through an application store (e.g., Play StoreTM). In the case of online distribution, at least a part of the computer program product may be temporarily stored or temporarily generated in a storage medium such as a memory of a manufacturer's server, a server of an application store, or a relay server.

Each of the components (e.g., modules or programs) according to the various embodiments described above may be composed of a single or multiple entities, and some of the corresponding sub-components described above may be omitted, or other sub-components may be further included in various embodiments. Alternatively or additionally, some of the components (e.g., modules or programs) may be integrated into a single entity, which may perform the same or similar functions performed by each of the corresponding components prior to integration. Operations performed by modules, programs or other components according to various embodiments may be executed sequentially, in parallel, iteratively or heuristically, or at least some of the operations may be executed in a different order, omitted, or other operations may be added.

Although the preferred embodiments of the present disclosure have been illustrated and described above, the present disclosure is not limited to the specific embodiments described above, and various modifications may be made by a person skilled in the art to which the present disclosure pertains without departing from the gist of the present disclosure as claimed in the claims, and such modifications should not be understood individually from the technical idea of the present disclosure.

Claims (15)

In electronic devices, Memory that stores the minimum duty cycle; An inverter that converts direct current into alternating current; motor; and At least one processor for transmitting the converted AC power to the motor; At least one processor of the above, Identify the duty ratio of the PWM (Pulse Width Modulation) signal for controlling the above inverter, An electronic device that controls a switch corresponding to the PWM signal among a plurality of switches included in the inverter to an OFF state when the duty ratio of the PWM signal is less than or equal to the minimum duty ratio. In the first paragraph, At least one processor of the above, Obtain a target time in which the duty ratio of the above PWM signal is less than or equal to the minimum duty ratio, An electronic device that controls the switch to be OFF during the target time. In the second paragraph, At least one processor of the above, Identifying a first point in time when the duty ratio of the PWM signal becomes the minimum duty ratio while the duty ratio of the PWM signal is greater than the minimum duty ratio, Identifying a second point in time when the duty ratio of the PWM signal becomes the minimum duty ratio while the duty ratio of the PWM signal is less than the minimum duty ratio, An electronic device that controls the switch to be OFF during the target time representing from the first time point to the second time point. In the third paragraph, At least one processor of the above, At the first point in time, change the switch from On to Off, Keep the switch in the OFF state from the first point in time to the second point in time, An electronic device that changes the switch from an OFF state to an ON state at the second point in time. In the first paragraph, At least one processor of the above, The maximum duty ratio is obtained by subtracting the minimum duty ratio from the duty ratio of 100%. An electronic device that controls the switch corresponding to the PWM signal to be in the ON state when the duty ratio of the PWM signal is greater than or equal to the maximum duty ratio. In paragraph 5, At least one processor of the above, Obtain a target time in which the duty ratio of the above PWM signal is greater than or equal to the maximum duty ratio, An electronic device that controls the switch to be ON during the target time. In Article 6, At least one processor of the above, Identifying a third point in time when the duty ratio of the PWM signal becomes the maximum duty ratio while the duty ratio of the PWM signal is less than the maximum duty ratio, Identifying a fourth point in time when the duty ratio of the PWM signal becomes the maximum duty ratio while the duty ratio of the PWM signal is greater than the maximum duty ratio, An electronic device that controls the switch to be ON during the target time representing from the third time point to the fourth time point. In the first paragraph, The above inverter, It is a 3-phase inverter, The above multiple switches are, including a first switch, a second switch, a third switch, a fourth switch, a fifth switch and a sixth switch, At least one processor of the above, Provide a first PWM signal corresponding to the first phase based on the first switch and the fourth switch, Provide a second PWM signal corresponding to the second phase based on the second switch and the fifth switch, An electronic device providing a third PWM signal corresponding to a third phase based on the third switch and the sixth switch. In Article 8, At least one processor of the above, When the above first switch is in the OFF state, the fourth switch is controlled to the ON state, When the second switch is in the OFF state, the fifth switch is controlled to the ON state, An electronic device that controls the sixth switch to be in an ON state when the third switch is in an OFF state. In the first paragraph, The above inverter, An electronic device that is a three-phase inverter using three DPWM (Discontinuous DPWM) signals spaced 120 degrees apart. A method for controlling an electronic device, comprising a memory storing a minimum duty ratio, an inverter converting direct current into alternating current, and a motor, and transmitting the converted alternating current to the motor, A step of identifying the duty ratio of a PWM (Pulse Width Modulation) signal for controlling the above inverter; and A control method, comprising: a step of controlling a switch corresponding to the PWM signal among a plurality of switches included in the inverter to an OFF state if the duty ratio of the PWM signal is less than or equal to the minimum duty ratio. In Article 11, The above control method is, A step of obtaining a target time in which the duty ratio of the PWM signal is less than or equal to the minimum duty ratio; further comprising; The step of controlling the above switch to the OFF state is: A control method for controlling the switch to be OFF during the target time. In Article 12, The step of controlling the above switch to the OFF state is: Identifying a first point in time when the duty ratio of the PWM signal becomes the minimum duty ratio while the duty ratio of the PWM signal is greater than the minimum duty ratio, Identifying a second point in time when the duty ratio of the PWM signal becomes the minimum duty ratio while the duty ratio of the PWM signal is less than the minimum duty ratio, A control method for controlling the switch to be OFF during the target time representing from the first time point to the second time point. In Article 13, The step of controlling the above switch to the OFF state is: At the first point in time, change the switch from On to Off, Keep the switch in the OFF state from the first point in time to the second point in time, A control method for changing the switch from OFF to ON at the second point in time. In Article 11, The above control method is, A step of obtaining the maximum duty ratio by subtracting the minimum duty ratio from the duty ratio of 100%; and A control method, comprising: a step of controlling the switch corresponding to the PWM signal to an ON state if the duty ratio of the PWM signal is greater than or equal to the maximum duty ratio.

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