CN111355425A

CN111355425A - Drive control circuit, drive method and device, compressor and air conditioning equipment

Info

Publication number: CN111355425A
Application number: CN202010302036.0A
Authority: CN
Inventors: 龙谭; 黄招彬; 时崎久; 文先仕; 赵鸣; 徐锦清; 曾贤杰; 张杰楠; 胡斌; 堀部美彦
Original assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Current assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Priority date: 2020-04-16
Filing date: 2020-04-16
Publication date: 2020-06-30

Abstract

The application discloses drive control circuit, drive method, device, compressor and air conditioning equipment, this circuit is used for driving the motor including opening the winding, open the winding and include first end and second end, this circuit includes: a power supply unit; a switching section including a mechanical switch; and the rectifier bridge comprises an alternating current input end and a direct current output end, the alternating current input end is connected to the second end, and the direct current output end is connected to the power supply part. The circuit can complete follow current through the rectifier bridge and eliminate current in the motor winding, so that the action of switching off the switch can be executed without waiting for the current to be reduced to zero after the power supply is powered off, the time required by the process of switching the wiring mode of the motor winding is reduced, and the switching efficiency is improved; through the circuit driving motor, the wiring mode of the motor winding can be rapidly adjusted to match the rotating speed of the motor, so that the operating efficiency of the full rotating speed frequency band of the motor is improved. But this application wide application in motor technical field.

Description

Drive control circuit, drive method and device, compressor and air conditioning equipment

Technical Field

The application relates to the technical field of motors, in particular to a drive control circuit, a drive method, a drive device, a compressor and air conditioning equipment.

Background

The variable frequency air conditioner is a common household appliance, and compared with a common fixed frequency air conditioner, the variable frequency air conditioner can refrigerate/heat more quickly, and has smaller temperature fluctuation in a stable state, so the variable frequency air conditioner is popular with wide users. In the variable frequency air conditioner, a permanent magnet motor is often used as a motor for driving a compressor, and the permanent magnet motor is a high-efficiency motor which utilizes a permanent magnet to form a magnetic field and has the advantages of small volume, high efficiency, simple structure and the like. In order to improve the operating efficiency of the permanent magnet motor, a higher main flux is often used, and if the rotating speed of the motor is increased to a high frequency, the flux weakening control in a deep degree may increase the loss of the motor and affect the stability of the system, so a mode of adjusting the connection of a motor winding is generally adopted to improve the utilization rate of the bus voltage.

In the related art, taking a three-phase motor as an example, two sets of switches are usually provided, and the motor windings are switched between delta connection and star connection through the cooperation of the two sets of switches to change the phase voltage of the motor windings, so that the motor can enter high-frequency operation without weak magnetic control. However, in the process of switching the winding connection method, the power supply needs to be stopped for a while, and after the power supply is stopped, the current still exists in the motor winding, so that the switching-off operation can be executed only after the current of the motor winding is zero after the follow current is finished, and the switching time is long.

Disclosure of Invention

The embodiment of the application provides a drive control circuit, a drive method, a drive device, a compressor and air conditioning equipment, so that the time for waiting for motor winding follow current in the process of switching the wiring mode of a motor winding can be saved, the efficiency of switching the wiring mode of the motor winding is improved, and the operating efficiency of the full-rotating-speed frequency band of a motor is improved.

According to a first aspect of embodiments of the present application, there is provided a drive control circuit for driving a motor including an open winding, the drive control circuit including:

a power supply part for providing an alternating current power supply for the open winding;

a switching section including a mechanical switch; the switching part is used for switching the open winding into a first wiring mode or a second wiring mode; wherein the open winding includes a first phase open winding and a second phase open winding, the first phase open winding includes a first terminal and a second terminal, the second phase open winding includes a third terminal and a fourth terminal, and the first terminal and the third terminal are connected to the power supply part; the first connection method is a connection method in which the second terminal and the fourth terminal are connected, and the second connection method is a connection method in which the second terminal and the fourth terminal are connected to the power supply unit;

and a rectifier bridge including an ac input terminal and a dc output terminal, the ac input terminal being connected to the second terminal and the fourth terminal, and the dc output terminal being connected to the power supply unit.

In the embodiment of the application, the rectifier bridge is arranged in the drive control circuit to continue current, so that the action of switching off the switch can be executed under the condition that the current in the motor winding does not need to be reduced to 0, the time length for stopping power supply of the power supply can be effectively reduced, and the efficiency for switching the wiring mode of the motor winding is improved.

In addition, the drive control circuit according to the above-mentioned embodiment of the present application may further have the following additional technical features:

optionally, in an embodiment of the present application, the open winding further includes a third open winding, the third open winding includes a fifth terminal and a sixth terminal, the first connection manner is a star connection manner, and the second connection manner is a delta connection manner;

the rectifier bridge is a three-phase full-wave rectifier bridge.

According to the embodiment of the application, the motor winding is in a three-phase open winding form, the three-phase open winding is more suitable for three-phase power which is commonly used at present, and the three-phase motor has the advantages of simple structure, excellent performance and balanced running load, and is suitable for driving the compressor.

Optionally, in an embodiment of the present application, the driving control circuit further includes: the first electronic switch, the first diode and the second diode;

the direct current output end comprises a direct current positive electrode output end and a direct current negative electrode output end;

one end of the first electronic switch and the direct current positive electrode output end are connected to the positive electrode of the first diode, and the negative electrode of the first diode is connected to the power supply part; the other end of the first electronic switch and the direct current negative pole output end are connected to the negative pole of the second diode, and the positive pole of the second diode is connected to the power supply part.

In the embodiment of the application, the first electronic switch can replace the on/off action of the mechanical switch through the on/off action, so that the time required by switching in and switching out of the star connection of the motor winding is reduced, and the switching efficiency is improved.

Optionally, in an embodiment of the present application, the driving control circuit further includes:

and the second electronic switch is connected with the mechanical switch in parallel and is used for conducting so that the open winding is in delta connection.

In the embodiment of the application, the second electronic switch can replace the on/off action of the mechanical switch through the on/off action, so that the time required by switching in and switching out of the delta connection of the motor winding is reduced, and the switching efficiency is improved.

Optionally, in an embodiment of the present application, the second electronic switch includes two metal oxide semiconductor field effect transistors connected in series in an opposite direction.

In the embodiment of the application, the two reverse series MOSFET tubes are used as a whole electronic switch, so that the circuit is controllable in two directions, reverse induced current generated in the power-off process of the motor winding can be prevented from flowing backwards to damage the MOSFET tubes, and the switching reliability of the drive control circuit is improved.

Optionally, in an embodiment of the present application, the mechanical switch is a single-pole double-throw switch, and the number of the single-pole double-throw switches is the same as the number of phases of the open winding.

In the embodiment of the application, the single-pole double-throw switch is adopted to complete the switching of the motor windings, the number of the required mechanical switches is small, and the cost is lower.

According to a second aspect of embodiments of the present application, there is provided a driving method for driving a motor including an open winding, the method including the steps of:

acquiring the rotating speed of the motor;

determining that the rotating speed rises to a second threshold value, and switching the open winding into a second wiring mode through a driving control circuit;

or,

determining that the rotating speed is reduced to a first threshold value, and switching the open winding into a first wiring mode through a driving control circuit;

the driving control circuit is the driving control circuit described in the above embodiment.

In the embodiment of the application, a driving method is provided based on the embodiment of the driving control circuit, and the method can be used for rapidly switching the wiring mode of the motor winding so as to enable the motor winding to be adaptive to the running rotating speed of the motor and improve the running efficiency of the motor in the full rotating speed frequency band.

In addition, according to the driving method of the above embodiment of the present application, the following additional technical features may also be provided:

optionally, in an embodiment of the present application, the first threshold is less than or equal to the second threshold.

In the embodiment of the application, the first threshold value can be set to be smaller than the second threshold value, so that the motor can execute the action of switching the winding wiring mode as less as possible, on one hand, the use time for switching the winding wiring mode is reduced, the running efficiency of the motor is improved, on the other hand, the switching times of the switch can be reduced, and the service life of the switch is prolonged.

Optionally, in an embodiment of the present application, the switching the open winding into the second connection mode by the driving control circuit or the switching the open winding into the first connection mode by the driving control circuit includes the following steps:

determining that the power supply of the open winding is stopped, and opening the mechanical switch or the second electronic switch.

In the embodiment of the application, the rectifier bridge is arranged in the drive control circuit to follow current, so that when the power supply of the open winding is stopped, the action of switching off the switch can be executed without waiting for the current in the motor winding to be reduced to 0, and the efficiency of switching the wiring mode of the motor winding can be effectively improved.

According to a third aspect of embodiments herein, there is provided an apparatus comprising:

at least one processor;

at least one memory for storing at least one program;

when executed by the at least one processor, cause the at least one processor to implement the method of the second aspect.

According to a fourth aspect of embodiments of the present application, there is provided a compressor including: an electric motor;

the motor is driven by the drive control circuit of the first aspect or by the apparatus of the third aspect.

According to a fifth aspect of embodiments of the present application, there is provided an air conditioning apparatus including the compressor of the fourth aspect.

According to the technical scheme provided by the embodiment of the application, the power supply part, the switching part and the rectifier bridge form the drive control circuit, and the drive control circuit can complete follow current through the rectifier bridge and eliminate current in the motor winding, so that the action of switching off the switch can be executed without waiting for the current to be reduced to zero after the power supply is powered off, the time required by the process of switching the wiring mode of the motor winding is reduced, and the switching efficiency is improved; the motor is driven by the drive control circuit, so that the wiring mode of a motor winding can be rapidly adjusted to match the rotating speed of the motor, and the operating efficiency of the full rotating speed frequency band of the motor is improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following description is made on the drawings of the embodiments of the present application or the related technical solutions in the prior art, and it should be understood that the drawings in the following description are only for convenience and clarity of describing some embodiments in the technical solutions of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of an air conditioning apparatus;

fig. 2 is a schematic diagram of a drive control circuit in the related art;

fig. 3 is a schematic diagram of a driving control circuit provided in an embodiment of the present application;

fig. 4 is a schematic circuit diagram of a power supply portion in a drive control circuit provided in an embodiment of the present application;

fig. 5(a) is a schematic circuit diagram of a relay switch in a driving control circuit provided in an embodiment of the present application; FIG. 5(b) is a schematic circuit diagram of a relay switch closure in a drive control circuit provided in an embodiment of the present application;

fig. 6 is a schematic diagram of another drive control circuit provided in the embodiment of the present application;

fig. 7 is a schematic diagram of another drive control circuit provided in the embodiment of the present application;

fig. 8(a) is a schematic diagram of a single-pole double-throw switch in a driving control circuit provided in an embodiment of the present application, so that a motor winding is in a star connection mode; fig. 8(b) is a schematic diagram of a single-pole double-throw switch in a driving control circuit provided in the embodiment of the present application, so that a motor winding is in a delta connection mode;

fig. 9(a) is a schematic circuit diagram of a single-pole double-throw relay switch in a drive control circuit provided in an embodiment of the present application at a lower contact point; FIG. 9(b) is a schematic circuit diagram of a single-pole double-throw relay switch at an upper contact point in a driving control circuit provided in an embodiment of the present application;

fig. 10 is a flowchart of a driving method provided in an embodiment of the present application;

FIG. 11 is a schematic diagram of a switching relationship between a motor rotation speed and a motor winding connection provided in an embodiment of the present application;

fig. 12 is a control timing chart of each switch and power supply during switching from star connection to delta connection in the first drive control circuit provided in the embodiment of the present application;

fig. 13 is a control timing chart of each switch and power supply during the switching from delta connection to star connection in the first drive control circuit provided in the embodiment of the present application;

fig. 14 is a control timing chart of each switch and power supply during switching from star connection to delta connection in the second drive control circuit provided in the embodiment of the present application;

fig. 15 is a control timing chart of each switch and power supply during switching from delta connection to star connection in the second drive control circuit provided in the embodiment of the present application;

fig. 16 is a control timing chart of each switch and power supply during switching from star connection to delta connection in the third drive control circuit provided in the embodiment of the present application;

fig. 17 is a control timing chart of each switch and power supply in the process of switching from delta connection to star connection in the third drive control circuit provided in the embodiment of the present application;

fig. 18 is a schematic view of an apparatus provided in an embodiment of the present application.

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "first," "second," "third," and "fourth," etc. in the description and claims of this application and in the accompanying drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

Referring to fig. 1, a schematic diagram of an air conditioning apparatus includes: a drive control circuit 110, a compressor 120 including a motor 1201, a four-way valve 130, a first heat exchanger 140, an expansion valve 150, and a second heat exchanger 160. Wherein the first heat exchanger 140 is disposed indoors and the second heat exchanger 160 is disposed outdoors. In the embodiment of the present application, the connection relationship and the control logic between the driving control circuit 110 of the air conditioner 100 and the motor 1201 of the compressor 120 are mainly improved, and other components may be arranged or adjusted according to conventional implementation means.

The following describes the deficiencies of the present stage drive control circuit with reference to the drawings, and referring to fig. 2, a drive control circuit of the present stage inverter air conditioner is shown by taking a motor with three-phase open windings as an example. In this circuit, a converter 220, an inverter 230, a first switching switch group 250, and a second switching switch group 260 are included. The ac power supply 210 is generally commercial power, has a voltage of 220V and a frequency of 50Hz, and the converter 220 rectifies and filters the ac power supplied by the ac power supply 210 to obtain a dc power of about 310V, and the dc power is inverted by the inverter 230 to obtain an inverter power supply for controlling the operation of the compressor, i.e., the inverter 230 converts the dc power output by the converter 220 into a three-phase ac power and supplies the three-phase ac power to the open winding 240 of the motor, thereby achieving the effect of an inverter. The driving motor used by the compressor in the variable frequency air conditioning equipment is mostly a permanent magnet motor, and in order to ensure the operating efficiency of the motor, different winding wiring modes need to be selected when the motor is operated in a medium-low rotating speed frequency band and a high rotating speed frequency band. Specifically, when the motor operates in a medium-low rotating speed frequency band, a star connection method can be adopted to improve the back electromotive force, so that the operating efficiency of the motor is higher; when the motor operates in a high-speed frequency band, the winding needs higher voltage, and at the moment, the motor winding can be switched to a delta connection method so as to improve the loading capacity of the motor.

In fig. 2, the first change-over switch group 250 corresponds to a delta connection, and the second change-over switch group 260 corresponds to a star connection, that is, when the motor is operated at a low-medium rotation speed, the switches KY1 and KY2 in the second change-over switch group 160 are closed, and the switches KD1, KD2 and KD3 in the first change-over switch group 250 are open; when the motor runs at a high-frequency rotating speed, the switches KY1 and KY2 in the second change-over switch group 260 are opened, and the switches KD1, KD2 and KD3 in the first change-over switch group 250 are closed. The specific process of switching the connection mode of the motor winding 240 is as follows: when the motor needs to be switched from low-frequency rotating speed operation to high-frequency rotating speed operation, firstly, the power supply is switched off, after the current in the motor winding 240 is reduced to 0, the switches KY1 and KY2 in the second change-over switch group 260 are switched off, the switches KD1, KD2 and KD3 in the first change-over switch group 250 are switched on, and the power supply is restarted, so that the switching from star connection to delta connection is completed; on the contrary, when the motor needs to be switched from the high-frequency rotation speed operation to the medium-low frequency rotation speed operation, the power supply is firstly disconnected, after the current in the motor winding 240 is reduced to 0, the switches KD1, KD2 and KD3 in the first change-over switch group 250 are disconnected, the switches KY1 and KY2 in the second change-over switch group 260 are closed, and the power supply is restarted, so that the switching from the delta connection to the star connection is completed once. The problems that exist here mainly include: on one hand, in order to reduce the loss, generally, the switches in the first and

second switch groups

250 and 260 are both mechanical switches, and the action time required for switching the mechanical switches is long, while if all the switches in the first and

second switch groups

250 and 260 are switched to electronic switches, although the time for switching is reduced, the electronic switches need to be kept in a conducting mode for a long time when the motor operates stably, and the loss of the circuit is greatly increased; on the other hand, in order to eliminate the current in the motor winding 240, the power supply needs to be stopped before the switch is turned off, and therefore, the time for deenergizing the motor is relatively long. Furthermore, the power-off time of the motor is long, the motor is out of order due to the fact that the power-off time of the motor is too long, and the motor may need to be stopped (the rotating speed of the motor is reduced to 0) and then started. Therefore, the driving control circuit obviously takes long time and has low efficiency when switching the wiring mode of the motor winding. It should be noted that the above is only for assisting understanding of the technical solutions in the present application, and does not represent the prior art considered to be disclosed.

Referring to fig. 3, a driving control circuit provided in an embodiment of the present application for driving a motor including three-phase open windings includes a power supply portion 310, a switching portion 330, and a rectifier bridge 340:

the power supply part 310 is used for providing alternating current power supply for the open winding 320 of the motor; for a three-phase motor, the three-phase motor includes a first phase open winding U, a second phase open winding V, and a third phase open winding W, and both ends of each phase winding have interface terminals, for example, in fig. 3, a first terminal is led out from the left end of the first phase open winding U, and a second terminal is led out from the right end; a third terminal is led out from the left end of the second open winding V, and a fourth terminal is led out from the right end of the second open winding V; and a fifth terminal is led out from the left end of the third open winding W, and a sixth terminal is led out from the right end of the third open winding W. The first, third, and fifth terminals are connected to the power supply part 310, and when the second, fourth, and sixth terminals of the open coil 320 are connected, a star connection is performed; when the second, fourth and sixth terminals of the open winding 320 are also connected to the power supply section, a delta connection is made. The three-phase alternating current power supply is a transmission form of electric energy, is called three-phase power for short, and is a power supply formed by three alternating current potentials with the same frequency, the same amplitude and the phase difference of 120 degrees in sequence. The three-phase motor has the advantages of large power generation capacity, low power transmission cost, wide popularization, simple structure, small volume and good operation characteristics. The embodiments of the present application are explained mainly on the basis of three-phase power and three-phase motors, but it should be understood that the solution in the present application is not limited to windings containing only three phases.

Specifically, referring to fig. 4, the embodiment of the present application provides a schematic diagram of a part of a power supply portion, including a dc input source 410 and an inverter 420, and optionally, the dc input source 410 may further include a capacitor C₊Capacitor C₊Can be used for stabilizing the input voltage; alternatively, the DC input source 410 mayThe dc input source 410 may be implemented by a rectifying circuit connected to the commercial power and a Power Factor Correction (PFC) circuit, or by a module or device such as a battery or a capacitor. The inverter 420 is used to convert dc power from the dc input source 410 to ac power for driving the three phase windings U, V, W of the motor. Specifically, as shown in fig. 4, the inverter 420 includes 6 electronic switching modules UH, UL, VH, VL, WH, and WL, N1, and N2 are two power supply lines of the dc input source 410, respectively, the power supply line N1 is connected to the positive electrode, the power supply line N2 is connected to the negative electrode, and the capacitor C is connected to the negative electrode₊Connected between a power supply line N1 and a power supply line N2, electronic switch assembly UH and electronic switch assembly UL being connected in series between a power supply line N1 and a power supply line N2, electronic switch assembly VH and electronic switch assembly VL being connected in series between a power supply line N1 and a power supply line N2, electronic switch assembly WH and electronic switch assembly WL being connected in series between a power supply line N1 and a power supply line N2; u-phase power supply output is led out between the electronic switch assembly UH and the electronic switch assembly UL, V-phase power supply output is led out from the electronic switch assembly VH and the electronic switch assembly VL, and W-phase power supply output is led out from the electronic switch assembly WH and the electronic switch assembly WL. In the embodiment of the application, the electronic switch assemblies UH, UL, VH, VL, WH and WL are turned on or off according to the related driving signals of the inverter, so that inversion and output of the direct-current power supply are realized. Alternatively, for a single electronic switch assembly, it may comprise one electronic switch and a diode connected in anti-parallel therewith, wherein the electronic switch may be an Insulated Gate Bipolar Transistor (IGBT). Taking the electronic switch assembly UH in fig. 4 as an example, it includes an electronic switch UHa and a diode UHb, UHa is an IGBT tube, when its base has a driving pulse input, the collector and emitter are turned on, a diode UHb is connected in anti-parallel with the IGBT tube UHa, and the diode UHb has two functions: firstly, in order to provide the passageway for alternating current side direct current side feedback reactive power, secondly in order to release the inductance voltage on the motor winding, prevent its reverse breakdown IGBT pipe UHa. Of course, it is also possible here to arrange the electronic switching components as Metal Oxide Semiconductor Field Effect Transistors (MOSFETs) with their own parasitic diodes, the other electronic switching components being arranged in a similar manner to UH, hereAnd will not be described in detail. Also, it should be understood that the structure of the actual drive control circuit, inverter 420, is not limited to the structure shown in fig. 4.

The switching part 330, specifically, in one embodiment, the switching part 330 may include two parts: a star switch sub-section 3301 corresponding to a star connection and a triangle switch sub-section 3302 corresponding to a triangle connection. Switches KY1, KY2 in star switching sub-section 3301 and switches KD1, KD2 and KD3 in triangle switching sub-section 3302 are all mechanical switches, wherein, for star switching sub-section 3301, one end of mechanical switch KY1 is connected to the second terminal of the first phase open winding U, and the other end of mechanical switch KY1 is connected to the fourth terminal of the second phase open winding V; one end of the mechanical switch KY2 is connected to the fourth terminal of the second open winding V, and the other end of the mechanical switch KY2 is connected to the sixth terminal of the third open winding W. It should be noted here that the star switching sub-section 3301 may further be provided with a mechanical switch KY3 (not shown in the figures), one end of the mechanical switch KY3 is connected to the second terminal of the first phase open winding U, and the other end of the mechanical switch KY3 is connected to the sixth terminal of the third phase open winding W, and the provision of the mechanical switch KY3 can improve the success rate of switching to the star connection method, and avoid the occurrence of switching failure due to damage and poor contact of one mechanical switch in the star switching sub-section 3301 as much as possible; and the mechanical switch KY3 is omitted, the mechanical switch KY1 and the mechanical switch KY2 are separately arranged, the star-shaped switching sub-part 3301 can also work normally, and part of the device cost can be omitted. It should be understood that the arrangement, the corresponding winding phases and the connection modes of the mechanical switch KY1, the mechanical switch KY2 and the mechanical switch KY3 are not fixed, for example, in terms of the corresponding winding phases and the connection modes, only the mechanical switch KY2 and the mechanical switch KY3 are optional embodiments.

For the triangular switching sub-section 3302, one end of the mechanical switch KD1 is connected to the first terminal of the first phase open winding U, and the other end of the mechanical switch KD1 is connected to the sixth terminal of the third phase open winding W; one end of the mechanical switch KD2 is connected with the fifth terminal of the third phase open winding W, and the other end of the mechanical switch KD2 is connected with the fourth terminal of the second phase open winding V; one end of the mechanical switch KD3 is connected to the third terminal of the second phase open winding V, and the other end of the mechanical switch KD3 is connected to the second terminal of the first phase open winding U. Similarly, the winding phases and the connection modes corresponding to the mechanical switch KD1, the mechanical switch KD2 and the mechanical switch KD3 are all not fixed, and the winding phases and the connection modes can be flexibly selected and set.

These mechanical switches in the star switching sub-section 3301 and the triangle switching sub-section 3302 are used to switch the wiring of the motor winding 320, and specifically, when the mechanical switch KY1 and the mechanical switch KY2 in the star switching sub-section 3301 are closed and the mechanical switch KD1, the mechanical switch KD2 and the mechanical switch KD3 in the triangle switching sub-section 3302 are open, the motor winding 320 is in star connection, and the voltage of each phase is equal to the bus voltage divided by the bus voltage

When the mechanical switch KY1, the mechanical switch KY2 in the star switching sub-section 3301 are open and the mechanical switch KD1, the mechanical switch KD2 and the mechanical switch KD3 of the triangle switching sub-section 3302 are closed, the motor winding 320 is in delta connection, and the voltage of each phase is equal to the bus voltage. It can be seen that, for the same bus voltage, the winding voltage of each phase in the star connection state of the motor winding 320 is different from the winding voltage of each phase in the delta connection state of the motor winding 320, and therefore, switching the winding connection mode of the motor can change the bus voltage utilization rate of the motor, thereby conveniently adjusting the rotating speed of the motor.

As an alternative embodiment, the mechanical switches in the star-shaped switching sub-section 3301 and the triangular switching sub-section 3302 may be electromagnetic relays. The advantages of the electromagnetic relay mainly include high safety and reliability, long service life, etc., and a schematic diagram of a commonly used electromagnetic relay is shown in fig. 5(a) and 5(b), the relay includes an excitation power supply 510, an excitation coil 520, an excitation switch 530 and a relay switch 540, in fig. 5(a), the excitation switch 530 of the relay is off, the excitation coil 520 is in a non-excitation state, and the relay switch 540 is also in an off state at this time, and taking a mechanical switch KY1 in fig. 3 as an example of the relay, the second terminal of the first open-phase winding U and the fourth terminal of the second open-phase winding V of the motor are in an off state at this time. In fig. 5(b), the excitation switch 530 of the relay is closed, the excitation coil 520 is in an excitation state, and at this time, the relay switch 540 is attracted under the action of magnetic force, and still taking the mechanical switch KY1 in fig. 3 as the example of the relay, the second terminal of the first-phase open winding U and the fourth terminal of the second-phase open winding V of the motor are in a closed state at this time. It will be appreciated that the mechanical switches described above may each be provided as an electromagnetic relay, with reference to the principles of figure 5.

The rectifier bridge 340, in the embodiment of the present application, corresponds to the three-phase motor winding 320 and is a three-phase full-wave rectifier bridge 340, and the three-phase full-wave rectifier bridge 340 includes 6 groups of diodes D1-D6. In the embodiment of the present application, the three-phase full-wave rectifier bridge 340 includes an ac input terminal connected to the second end of the winding 320 and a dc output terminal connected to the power supply portion 310. Specifically, with the power supply section shown in fig. 4, the positive pole of the dc output terminal of the three-phase full-wave rectifier bridge 340 is connected to the power supply line N1, and the negative pole of the dc output terminal of the three-phase full-wave rectifier bridge 340 is connected to the power supply line N2, so that, during switching, the current in the winding 320 when the power supply stops supplying power can be quickly discharged through the rectifier bridge, for example, to the capacitor C₊Therefore, the switch can be turned off without waiting for the current in the winding 320 to drop to 0, the time for the power supply to stop supplying power can be effectively reduced, and the efficiency of switching the wiring mode of the winding 320 is improved. Of course, in practical applications, the output of the three-phase full-wave rectifier bridge 340 may be connected to a capacitor or other device at another position, and is not always returned to the power supply section 310. Furthermore, as an alternative implementation manner, the diodes D1 to D6 in the three-phase full-wave rectifier bridge 340 in the embodiment of the present application may also be replaced by electronic switching tubes, specifically, the electronic switching tubes include, but are not limited to, gate turn-off thyristors (GTO), power transistors (GTR), Metal Oxide Semiconductor Field Effect Transistors (MOSFET), Insulated Gate Bipolar Transistors (IGBT), and the like.

Referring to fig. 6, as an alternative implementation, the driving control circuit in this embodiment further includes a first electronic switch QY, a first diode D7 and a second diode D8, for the three-phase full-wave rectifier bridge 340, the dc output terminal thereof includes a dc positive output terminal and a dc negative output terminal, the first electronic switch QY is connected in parallel between the dc positive output terminal and the dc negative output terminal of the three-phase full-wave rectifier bridge 340, and one end and the dc positive output terminal of the first electronic switch QY are connected to the power supply section 310 through a forward series first diode D7; the other end of the first electronic switch QY and the dc negative output terminal are connected to the power supply section 310 through an inverse series second diode D8. The circuit structure has the advantages that the first electronic switch QY can replace the mechanical switch KY1 and the mechanical switch KY2 to execute switching operation, so that the time for switching operation is greatly reduced, and the time for power failure of the motor is further shortened. Specifically, when the first electronic switch QY is turned off, the branch in which it is located is turned off, and the circuit in this case has the same effect as that in fig. 3; when the first electronic switch QY is turned on, the second terminal of the first phase open winding U is connected through the first diode D1, the first electronic switch QY, the sixth diode D6 and the sixth terminal of the third phase open winding W, and the second terminal of the first phase open winding U is also connected through the first diode D1, the first electronic switch QY, the fifth diode D5 and the fourth terminal of the second phase open winding V, in other words, the motor winding 320 is in a star connection mode at this time, so that the turning-off/on of the first electronic switch QY can achieve the same effect as the turning-off/on of the mechanical switch KY1 and the mechanical switch KY 2. The operation time of the electronic switch device is much shorter than that of the mechanical switch, so that the motor winding 320 can be switched into or out of star connection more quickly by using the first electronic switch QY, and the power failure time of the motor is further shortened.

It should be noted that the first electronic switch QY in the embodiment of the present application may employ conventional power electronic devices, including but not limited to gate turn-off thyristors (GTO), power transistors (GTR), Metal Oxide Semiconductor Field Effect Transistors (MOSFET), Insulated Gate Bipolar Transistors (IGBT), etc.

Referring to fig. 7, as an alternative implementation manner, in an embodiment of the present application, the driving control circuit further includes three second electronic switches 3501 to 3503, where the electronic switch 3501 is connected in parallel with the mechanical switch KD1, the electronic switch 3502 is connected in parallel with the mechanical switch KD2, and the electronic switch 3503 is connected in parallel with the mechanical switch KD 3. The second electronic switch is used for operating when the switching unit switches, and in the embodiment of the present application, when the electronic switch 3501, the electronic switch 3502, and the electronic switch 3503 are turned on, the motor winding 320 may be in delta connection. The electronic switch 3501, the electronic switch 3502, and the electronic switch 3503 are used to replace the mechanical switch KD1, the mechanical switch KD2, and the mechanical switch KD3 to perform switching operations when the triangular switching sub-portion 3302 is switched, so that the switching operations are greatly reduced, the motor winding 320 is switched into or out of a delta connection mode more quickly, and the power failure time of the motor can be also shortened significantly.

Similarly, it should be noted that the devices Q1-Q6 in the second electronic switch in the embodiment of the present application may be implemented by commonly-used power electronic devices, including but not limited to gate turn-off thyristors (GTO), power transistors (GTR), Metal Oxide Semiconductor Field Effect Transistors (MOSFET), Insulated Gate Bipolar Transistors (IGBT), etc. As an optional implementation manner, in the embodiment of the present application, the electronic switch 3501, the electronic switch 3502, and the electronic switch 3503 all use two MOSFET tubes connected in series in opposite directions as an integral electronic switch, which has the advantages of enabling the circuit to be bidirectionally controllable, and preventing reverse induced current generated during the power-off process of the motor winding from flowing backwards to damage the MOSFET tubes. Of course, the MOSFET tube can be replaced by an IGBT device with an antiparallel diode, and the same effect can be achieved.

In the above embodiments of the present application, the switching sections each include the star-shaped switching sub-section 3301 and the triangular switching sub-section 3302, but in practice, in order to save switching devices as much as possible, the switching sections may be provided as a set of single-pole double-throw switches. Specifically, referring to fig. 8, an embodiment of the present application in which a single-pole double-throw switch is used to form the switching unit 330 is shown. In the embodiment of the present application, for a three-phase motor, the switching unit 330 includes one single-pole double-throw switch provided corresponding to each phase, and each single-pole double-throw switch includes a fixed fulcrum, an upper contact, and a lower contact. Take single-pole double-throw switch K1 as an example: the single-pole double-throw switch K1 corresponds to the third phase open winding W, the fixed pivot of the single-pole double-throw switch K1 is connected to the sixth terminal of the third phase open winding W, the upper contact of the single-pole double-throw switch K1 is connected to the first terminal of the first phase open winding U, the lower contact of the single-pole double-throw switch K1 can be connected to the fourth terminal of the second phase open winding V through the single-pole double-throw switch K2, and the lower contact of the single-pole double-throw switch K1 can also be connected to the second terminal of the first phase open winding U through the single-pole double-throw switch K3. Three single-pole double-throw switches K1, K2, K3 form a switch group, and are commonly used for switching the wiring mode of the motor winding 320, wherein fig. 8(a) shows a schematic diagram of the switching part 330 when the motor winding 320 is in star connection, and the knife gates of the single-pole double-throw switches K1, K2, K3 are all located at the lower contact point; fig. 8(b) is a schematic diagram of the switching unit 330 when the motor winding 320 is in delta connection, and the switches of the single-pole double-throw switches K1, K2 and K3 are all located at the upper contact. It should be noted that, in the embodiment of the present application, the switching unit 330 formed by a single-pole double-throw switch may also be provided in combination with the three-phase full-wave rectifier bridge 340 in fig. 3, and only a three-phase ac output is led out from the second end of the open winding 320 and connected to the three-phase full-wave rectifier bridge 340, and a dc output of the three-phase full-wave rectifier bridge 340 is connected to the power supply unit 310; similarly, on the basis thereof, it is also possible to make settings in conjunction with the first electronic switch QY in fig. 6.

In the above embodiment of the switch section 330 with single-pole double-throw switch composition, the second electronic switches are arranged in such a manner that a to f in fig. 8 are 6 positions at which the second electronic switches can be connected, and three second electronic switches can be connected between ab, bc, and ef, respectively, in which case the second electronic switches between ab, bc, and ef can switch to the upper contact instead of the single-pole double-throw switches K1, K2, and K3, and the second electronic switches between ab, bc, and ef can be connected in parallel between the "single-pole double-throw switches only including the upper contact", and can perform the operation of switching in or out of the delta connection instead of the single-pole double-throw switches K1, K2, and K3. Since the second electronic switches between ab, bc, and ef are turned on, the same effect as that achieved by the single-pole double-throw switches K1, K2, and K3 being all at the upper contacts is achieved, the second electronic switches between ab, bc, and ef can be respectively analogous to the

electronic switches

3501, 3502, and 3503 in fig. 7.

In the embodiment of the present application, the single-pole double-throw switches K1, K2, and K3 may also adopt a relay, and the working principle of the relay of the single-pole double-throw switch is shown in fig. 9, the relay includes an excitation power supply 910, an excitation coil 920, an excitation switch 930, and a relay switch 940, and the knife contact of the relay switch 940 includes an upper contact 9401 and a lower contact 9402. In fig. 9(a), the excitation switch 930 of the relay is turned off, the excitation coil 920 is in the non-excited state, and the switch of the relay switch 940 is located at the lower contact 9402, and taking the relays in the state as an example of the single-pole double-throw switches K1, K2, and K3 in fig. 8, the second terminal of the first phase open winding U, the fourth terminal of the second phase open winding V, and the sixth terminal of the third phase open winding W of the motor are connected together, and the state is the star connection state shown in fig. 8 (a). In fig. 9(b), the excitation switch 930 of the relay is closed, the excitation coil 920 is in an excitation state, and at this time, under the action of magnetic force, the switch of the relay switch 940 is attracted and located at the upper contact 9401, taking the relays in this state as examples of the single-pole double-throw switches K1, K2, and K3 in fig. 8, then at this time, the first terminal of the first open winding U of the motor is connected to the sixth terminal of the third open winding W, the third terminal of the second open winding V is connected to the second terminal of the first open winding U, the fifth terminal of the third open winding W is connected to the fourth terminal of the second open winding V, and the motor winding is in a delta connection, that is, the state shown in fig. 8 (b).

In the above embodiments, the motor windings are explained and illustrated as three-phase windings, but it can be understood by those skilled in the art that the driving control circuit can also be adapted to winding connections of more than three phases based on the above description. In this case, if the mechanical switch is a single-pole single-throw switch, and two sets of single-pole single-throw switches are required to be matched to form the switching part, the total number of the switches is at least two times of the number of winding phases minus one; if the mechanical switch is a single pole double throw switch, the total number of switches may be the same as the number of winding phases. The principle and mode of arrangement of the rest of the power supply part, the rectifier bridge and the electronic switch are similar to those of the three-phase winding, and are not described in detail herein.

Referring to fig. 10, an embodiment of the present application further provides a driving method for driving a motor including an open winding, the method including steps S1010 and S1020:

s1010, obtaining the rotating speed of the motor;

s1020, determining that the rotating speed is increased to a second threshold value, and switching the open winding into a second wiring mode through a driving control circuit;

or,

the driving control circuit is the driving control circuit in the above embodiment.

The driving method in the embodiment of the present application is described below with reference to the above-described embodiment of the driving control circuit.

In the embodiment of the application, a driving method is provided based on the driving control circuit in the above embodiment, so that the fast switching of the wiring mode of the motor winding can be realized. Specifically, also taking a three-phase motor as an example, referring to fig. 3, for the drive control circuit shown in fig. 3, when the motor is at a low-medium rotation speed, the switches KY1 and KY2 in the star-shaped switching sub-section 3301 are closed, and the switches KD1, KD2 and KD3 in the triangular switching sub-section 3302 have relatively high operation efficiency when being opened; when the motor needs to be operated at a high-frequency rotating speed, the winding connection needs to be switched, namely, switches KY1 and KY2 in the star-shaped switching sub-part 3301 are switched off, and switches KD1, KD2 and KD3 in the triangular switching sub-part 3302 are switched on, so that the switching from the star connection to the triangular connection of the winding is completed. On the contrary, when the motor is switched from high-frequency rotation speed to middle-low frequency rotation speed, the winding connection needs to be switched, at this time, the switches KD1, KD2 and KD3 of the triangular switching sub-part 3302 are disconnected, and the switches KY1 and KY2 in the star switching sub-part 3301 are closed, so that the switching from star connection to delta connection of the winding is completed. It can be understood that when the efficiency of switching the wiring modes of the motor winding is improved, the operating efficiency of the motor in the full-rotating-speed frequency band can be effectively improved.

Of course, the above description is only an approximate result of the handover procedure and not an actual complete procedure; moreover, it should be understood that the above-mentioned low-medium frequency and high-frequency rotation speeds are relative, the low-medium frequency rotation speed and the high-frequency rotation speed which are set in different motors and different operating environments are likely to be different in value, and the specific rotation speed threshold value needs to be adjusted and set according to the actual situation. In the embodiment of the present application, the rotation speed exceeding the second threshold is a high-frequency rotation speed, and the rotation speed lower than the first threshold is a medium-low frequency rotation speed, so that the first threshold is less than or equal to the second threshold.

Alternatively, referring to fig. 11, the motor windings switch to delta connection when the motor speed rises to a second threshold and switch to star connection when the motor speed drops to a first threshold. Here, the first threshold may be set to be smaller than the second threshold, so that the motor performs the winding switching as little as possible, on one hand, when the winding is switched, the operation efficiency of the motor is improved, on the other hand, the switching frequency of the switch is reduced, and the service life of the switch is prolonged. It should of course be understood that the difference between the first threshold and the second threshold should not be too large, otherwise the switching of the windings to adapt the motor speed would be less effective, and the operating efficiency of the motor would be affected.

The following is a detailed description of a specific process of switching the wiring modes of the motor winding in the embodiment of the present application:

in the first embodiment of the present application, referring to fig. 3 and 12, fig. 12 shows the drive control circuit in fig. 3, and during the switching of the three-phase motor winding from star connection to delta connection, the on/off states of the mechanical switches KY1 to KY2 in the star switching sub-section 3301, the on/off states of the mechanical switches KD1 to KD3 in the delta switching sub-section 3302, and the power supply state of the power supply are set. In the embodiment of the present application, at time t1, it is detected that the rotation speed of the motor rises to the second threshold, at this time, the power supply to the open winding 320 is stopped, and the mechanical switches KY1 to KY2 in the star-shaped switching sub-portion 3301 are turned off; at time t2, closing the mechanical switches KD 1-KD 3 in the triangular switching sub-part 3302; at time t3, the switch is completed, the power supply is re-supplied, and the motor enters the process of running control according to the delta connection. It can be seen that, in the embodiment of the present application, the power supply is stopped at time t1, and the mechanical switches KY1 to KY2 in the star switching sub-portion 3301 can be turned off immediately, so that a period of freewheeling time that needs to be waited for in the conventional drive control circuit is eliminated. The reason is that: according to the method in the embodiment of the application, after the three-phase full-wave rectifier bridge 340 is arranged in the adopted drive control circuit, follow current can be completed through the three-phase full-wave rectifier bridge 340, and current in the motor winding 320 is eliminated, so that the action of switching off the switch can be executed without waiting for the current to be zero after the power supply is powered off, the time required by the switching process is reduced, and the switching efficiency is improved.

In the second embodiment of the present application, referring to fig. 3 and 13, fig. 13 shows the drive control circuit in fig. 3, in which the on/off states of the mechanical switches KY1 to KY2 in the star switching sub-section 3301, the on/off states of the mechanical switches KD1 to KD3 in the triangle switching sub-section 3302, and the power supply state of the power supply are switched during the switching of the three-phase motor winding from the delta connection to the star connection. In the embodiment of the present application, at time t1, it is detected that the rotation speed of the motor decreases to the first threshold, at which time the power supply to the open winding 320 is stopped, and the mechanical switches KD 1-KD 3 in the triangular switching sub-portion 3302 are turned off; at time t2, closing mechanical switches KY1 to KY2 in the star-shaped switching sub-section 3301; at time t3, the switch is completed, the power supply is re-supplied, and the motor enters the process of controlling the operation according to the star connection. It can also be seen that, in the embodiment of the present application, the power supply is stopped at time t1, and the mechanical switches KD1 to KD3 in the triangular switching sub-portion 3302 omit a period of freewheel time that needs to be waited in the conventional driving control circuit, which has similar technical effects to the first embodiment of the present application and is not described herein again.

In the third embodiment of the present application, referring to fig. 6 and 14, fig. 14 shows the drive control circuit in fig. 6, and during the switching of the three-phase motor winding from star connection to delta connection, the on/off states of the mechanical switches KY1 to KY2 in the star switching sub-section 3301, the on/off states of the mechanical switches KD1 to KD3 in the delta switching sub-section 3302, the on/off states of the first electronic switch QY, and the power supply state of the power supply. In the embodiment of the present application, at time t1, it is detected that the rotation speed of the motor rises to the second threshold, at this time, the first electronic switch QY is turned on, and the motor winding 320 is still in the star connection; at time t2, the mechanical switches KY1 to KY2 in the star switch sub-portion 3301 are turned off, and the motor winding 320 is still in star connection because the first electronic switch QY is turned on; at time t3, the power supply stops supplying power to the motor winding 320, and the first electronic switch QY is controlled to be turned off; at time t4, closing the mechanical switches KD 1-KD 3 in the triangular switching sub-part 3302; at time t5, the motor winding 320 is in delta connection, the switching is completed, the power supply supplies power again, and the motor enters the process of running control according to delta connection. As can be seen from comparison between the first embodiment of the present application and fig. 12, in the embodiment of the present application, the turn-off operation of the first electronic switch QY replaces the turn-off operation of the mechanical switches KY1 to KY2 at time t3, so that the time required for switching the motor winding 320 out of the star connection is shortened, and the switching efficiency is improved. It should be noted that, in the embodiments of the present method and the following embodiments, from the viewpoint of the operation of the motor, the time required for switching is reduced to be understood as the time for switching out or switching in a certain connection, which is reduced by the time period during which the power supply stops supplying power, rather than referring to the whole time period. For the present embodiment, the time period from t1 to t5 is not referred to, because the motor is still in the normal operation state during the time period from t1 to t 3. In addition, in the embodiment of the application, although the electronic switch is used for accelerating the switching speed, the electronic switch does not need to be conducted to drive the motor winding after the switching is completed, so that the service time of the electronic switch is very short, and the electric energy loss of the switching tube can be greatly saved. The technical effects of other parts of this embodiment are similar to those of the first embodiment of this application, and are not described herein again.

In a fourth embodiment of the present application, referring to fig. 6 and 15, fig. 15 shows the driving control circuit in fig. 6, and during the process of switching the three-phase motor winding from delta connection to star connection, the on/off states of the mechanical switches KY1 to KY2 in the star switching sub-section 3301, the on/off states of the mechanical switches KD1 to KD3 in the triangle switching sub-section 3302, the on/off states of the first electronic switch QY, and the power supply state of the power supply. In the embodiment of the present application, at time t1, it is detected that the rotation speed of the motor decreases to the first threshold, at which time the power supply to the open winding 320 is stopped, and the mechanical switches KD 1-KD 3 in the triangular switching sub-portion 3302 are turned off; at time t2, the first electronic switch QY is controlled to be turned on, and the power supply starts to supply power, and the motor winding 320 is switched to the star connection method, where the switching tube of the inverter in the power supply portion 310 and the first electronic switch QY may be turned on at the same time, and if a mechanical switch is adopted, the mechanical switch should be turned on first, and then the power supply starts to supply power, which takes longer time; at time t3, the mechanical switches KY1 to KY2 in the star-shaped switching sub-section 3301 are closed; at time t4, the motor winding 320 is already in star connection, the switching is completed, the power supply is re-supplied, and the motor enters the process of controlling the operation according to the star connection. As can be seen from comparison between the first embodiment of the present application and fig. 13, in the embodiment of the present application, the on operation of the first electronic switch QY replaces the closing operation of the mechanical switches KY1 to KY2 at time t2, so that the time required for switching the motor winding 320 into the star connection is shortened, and the switching efficiency is improved. The beneficial effects of other parts in the embodiment of the present application are the same as those in the second embodiment, and are not described herein again.

In a fifth embodiment of the present application, referring to fig. 7 and 16, fig. 16 shows the drive control circuit in fig. 7, and during the switching of the three-phase motor winding from star connection to delta connection, the on/off states of the mechanical switches KY1 to KY2 in the star switching sub-section 3301, the on/off states of the mechanical switches KD1 to KD3 in the delta switching sub-section 3302, the on/off states of the first electronic switch QY, the on/off states of the second electronic switches 3501 to 3503, and the power supply state of the power supply. In the embodiment of the present application, at time t1, it is detected that the rotation speed of the motor rises to the second threshold, and at this time, the first electronic switch QY is controlled to be turned on, and the motor winding 320 is still in the star connection; at time t2, the mechanical switches KY1 to KY2 in the star switch sub-portion 3301 are turned off, and the motor winding 320 is still in star connection because the first electronic switch QY is turned on; at time t3, the power supply stops supplying power to the motor winding 320, and the first electronic switch QY is controlled to be turned off; at the time of t4, switching tubes Q1 to Q6 in the second electronic switches 3501 to 3503 are controlled to be turned on, and at the same time, the power supply starts to supply power, and the motor winding 320 is switched to a delta connection method, where the switching tubes Q1 to Q6 of the inverter in the power supply part 310 can be simultaneously turned on, and if a mechanical switch is adopted, the mechanical switch should be closed first, and then the power supply starts to supply power, which takes a long time; at time t5, closing the mechanical switches KD 1-KD 3 in the triangular switching sub-part 3302; at time t6, the motor winding 320 is in delta connection, the switching is completed, the power supply supplies power again, and the motor enters the process of running control according to delta connection. As can be seen from comparison between the third embodiment of the present application and fig. 14, in the embodiment of the present application, the on-state action of the second electronic switches 3501 to 3503 at the time t4 replaces the on-state action of the mechanical switches KD1 to KD3, so that the time is shortened, the time required for switching the motor winding 320 into the delta connection mode is reduced, and the switching efficiency is improved. The beneficial effects of other parts in the embodiments of the present application are the same as those in the third embodiment, and are not described herein again.

In a sixth embodiment of the present application, referring to fig. 7 and 17, fig. 17 shows the drive control circuit in fig. 7, and during the process of switching the three-phase motor winding from delta connection to star connection, the on/off states of the mechanical switches KY1 to KY2 in the star switching sub-section 3301, the on/off states of the mechanical switches KD1 to KD3 in the triangle switching sub-section 3302, the on/off states of the first electronic switch QY, the on/off states of the second electronic switches 3501 to 3503, and the power supply state of the power supply. In the embodiment of the application, at the time t1, it is detected that the rotation speed of the motor decreases to the first threshold, and at this time, the switching tubes Q1 to Q6 in the second electronic switches 3501 to 3503 are controlled to be turned on, and the motor winding 320 is still in the delta connection; at the time of t2, the mechanical switches KD 1-KD 3 in the triangular switching sub-part 3302 are turned off, and the motor windings 320 are still in a triangular connection mode because the switching tubes Q1-Q6 in the second electronic switches 3501-3503 are turned on; at the time t3, the power supply stops supplying power to the motor winding 320, and meanwhile, the switch tubes Q1-Q6 in the second electronic switches 3501-3503 are controlled to be cut off; at time t4, the first electronic switch QY is controlled to be turned on, and the power supply starts to supply power, and the motor winding 320 is switched to the star connection method, where the switching tube of the inverter in the power supply portion 310 and the first electronic switch QY may be turned on at the same time, and if a mechanical switch is adopted, the mechanical switch should be turned on first, and then the power supply starts to supply power, which takes longer time; at time t5, the mechanical switches KY1 to KY2 in the star-shaped switching sub-section 3301 are closed; at time t6, the motor winding 320 is already in star connection, the switching is completed, the power supply is re-supplied, and the motor enters the process of controlling the operation according to the star connection. As can be seen from comparison between the fourth embodiment of the present application and fig. 15, in the embodiment of the present application, the turn-off action of the second electronic switches 3501 to 3503 at the time t3 replaces the turn-off action of the mechanical switch, so that the time consumption is shorter, the time required for switching the motor winding 320 out of the triangular wiring mode is reduced, and the switching efficiency is improved. The beneficial effects of other parts in the embodiments of the present application are the same as those in the fourth embodiment, and are not described herein again.

The above embodiment of the driving method may be extended to another embodiment of the driving control circuit with another structure, specifically, for a group of electronic switches functioning as a substitute for the mechanical switch, when the connection of the corresponding motor winding is to be switched when the group of electronic switches is switched on, the group of electronic switches is switched on before the switching unit starts switching, and the electronic switches are switched off during the switching of the switching unit, so as to substitute the off operation of the mechanical switch with the off operation of the electronic switches, thereby increasing the switching speed. When the corresponding motor winding is connected when the group of electronic switches are switched on, the electronic switches are switched on in the switching part, and the electronic switches are switched off after the switching part completes the switching, so that the action of closing the mechanical switches is replaced by the conduction of the electronic switches, and the switching speed is increased. Specifically, in one switching process, before the switching section starts switching refers to a time period before all the mechanical switches in the switching section have not performed a switching action; the switching part is a time period after all the mechanical switches in the switching part perform switching actions; the switching section switching refers to a state in which all mechanical switches of the switching section are open, specifically, for the switching section 330 including the star-shaped switching sub-section 3301 and the triangular switching sub-section 3302 shown in fig. 3, the switching section switching refers to a state in which the switches KY1, KY2 in the star-shaped switching sub-section 3301 have been open and the switches KD1, KD2, and KD3 of the triangular switching sub-section 3302 have not been closed, or a state in which the switches KD1, KD2, and KD3 of the triangular switching sub-section 3302 have been open and the switches KY1, KY2 in the star-shaped switching sub-section 3301 have not been closed, that is, the switches KY1, KY2, KD1, KD2, and KD3 are all in an open state; the switches K1, K2, and K3 shown in fig. 8 constituting the switching unit 330 can be understood as a state in which the knife is separated from one contact but not yet contacted with another contact, for example, a state in which the knife is separated from the upper contact and not yet contacted with the lower contact, or a state in which the knife is separated from the lower contact and not yet contacted with the upper contact. It should be understood that since the mechanical switch is operated for a much longer period of time than the electronic switch, the electronic switch can be operated for the period of time in the switching of the switching portion described above.

Referring to fig. 18, an apparatus is further provided in an embodiment of the present application, including:

at least one processor 1810;

at least one memory 1820 for storing at least one program;

when the at least one program is executed by the at least one processor 1820, the at least one processor 1820 may implement the above-described embodiments of the driving method.

The contents of the above method embodiments are all applicable to the present apparatus embodiment, the functions specifically implemented by the present apparatus embodiment are the same as those of the above method embodiments, and the advantageous effects achieved by the present apparatus embodiment are also the same as those achieved by the above method embodiments.

Embodiments of the present application also provide a computer-readable storage medium, in which processor-executable instructions are stored, and when executed by a processor, the processor-executable instructions are used to implement the above-mentioned driving method.

The contents in the above method embodiments are all applicable to the present storage medium embodiment, the functions specifically implemented by the present storage medium embodiment are the same as those in the above method embodiments, and the advantageous effects achieved by the present storage medium embodiment are also the same as those achieved by the above method embodiments.

An embodiment of the present application further provides a compressor, including: an electric motor;

the motor is driven by the drive control circuit or means in the above-described embodiment.

The embodiment of the application also provides air conditioning equipment which comprises the compressor in the embodiment.

Similarly, the contents in the embodiments of the driving control circuit and the device are all applicable to the embodiments of the compressor and the air conditioner, the functions implemented in the embodiments of the compressor and the air conditioner are the same as those in the embodiments of the driving control circuit and the device, and the beneficial effects achieved by the embodiments of the driving control circuit and the device are also the same as those achieved by the embodiments of the driving control circuit and the device.

It will be understood that all or some of the steps, systems of methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.

The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the embodiments, and various changes can be made without departing from the spirit of the present application within the knowledge of those skilled in the art.

Claims

1. A drive control circuit for driving a motor, the motor including an open winding, the drive control circuit comprising:

2. The drive control circuit according to claim 1, characterized in that: the open winding further comprises a third open winding, the third open winding comprises a fifth terminal and a sixth terminal, the first wiring mode is a star connection method, and the second wiring mode is a triangle connection method;

the rectifier bridge is a three-phase full-wave rectifier bridge.

3. The drive control circuit according to claim 2, further comprising: the first electronic switch, the first diode and the second diode;

4. The drive control circuit according to claim 3, characterized by further comprising:

5. The drive control circuit according to claim 4, characterized in that: the second electronic switch comprises two metal oxide semiconductor field effect transistors which are connected in series in an opposite direction.

6. The drive control circuit according to any one of claims 1 to 5, characterized in that: the mechanical switch is a single-pole double-throw switch, and the number of the single-pole double-throw switches is the same as the number of the phases of the open winding.

7. A driving method for driving a motor including an open winding, comprising the steps of:

acquiring the rotating speed of the motor;

or,

wherein the drive control circuit is the drive control circuit of any one of claims 1-6.

8. The method of claim 7, wherein: the first threshold is less than or equal to the second threshold.

9. The method according to any one of claims 7-8, wherein said switching the open winding into the second wiring mode by a drive control circuit or into the first wiring mode by a drive control circuit, comprises the steps of:

10. An apparatus, comprising:

at least one processor;

at least one memory for storing at least one program;

when executed by the at least one processor, cause the at least one processor to implement the method of any one of claims 7-9.

11. A compressor, comprising:

an electric motor;

the motor is driven by the drive control circuit of any one of claims 1-6 or by the apparatus of claim 10.

12. An air conditioning apparatus characterized by: comprising a compressor as claimed in claim 11.