WO2024240178A1 - Electronic atomization apparatus and control method - Google Patents

Abstract

Provided are an electronic atomization apparatus and a control method. The electronic atomization apparatus comprises: a susceptor (30) for heating an aerosol generating substrate to generate an aerosol; an LC oscillator (222) comprising an induction coil (260) and a capacitor, the LC oscillator (222) being configured to guide a changed current to flow through the induction coil (260) and thereby to drive the induction coil (260) to provide energy to the susceptor (30) so that the susceptor (30) heats the aerosol generating substrate; and a controller (221) configured to drive the LC oscillator (222) with an intermittent PWM signal to form a current flowing through the induction coil (260) and control a pulse density of the PWM signal within a predetermined time so that an energy value provided to the susceptor (30) is maintained at a preset energy value. The electronic atomization apparatus controls the pulse density of the PWM signal within a smoking duration of a user, so that the energy value provided to the susceptor (30) is maintained at the preset energy value, thereby maintaining the aerosol generation or smoking taste within the smoking duration stable.

Description

Electronic atomization device and control method

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to a Chinese patent application filed with the China Patent Office on May 25, 2023, with application number 202310605151.9 and entitled “Electronic Atomization Device and Control Method,” the entire contents of which are incorporated by reference into this application.

Technical Field

The embodiments of the present application relate to the field of electronic atomization technology, and in particular to an electronic atomization device and a control method.

Background Art

Smoking articles (eg, cigarettes, cigars, etc.) burn tobacco during use to produce tobacco smoke. People have attempted to replace these tobacco-burning articles by creating products that release compounds without combustion.

An example of such a product is a heating device that releases compounds by heating rather than burning a material. For example, the material may be tobacco or other non-tobacco products that may or may not contain nicotine. As another example, there are aerosol providing products, such as so-called electronic atomization devices. These devices typically contain a liquid that is heated to vaporize it, thereby producing an inhalable aerosol. Known electronic atomization devices sense the user's puffing action through an airflow sensor, and when the airflow sensor senses the user's puffing, the induction coil is controlled to generate a changing magnetic field to induce the receptor to heat up, thereby heating the liquid to produce an aerosol; in existing electronic atomization devices, the induction coil generates a changing magnetic field in response to a trigger signal from the airflow sensor. Further, when the electronic atomization device uses a symmetrical LC oscillating circuit with a fixed resonant frequency to invert the induction coil to generate a changing magnetic field, since the resonant frequency of the LC oscillating circuit and the 50% duty cycle of the PWM control signal are set to be constant and non-adjustable, the temperature of the receptor presents a continuous rise in the form of Figure 1 during the puffing time, which is prone to overheating or affecting the taste.

Application Contents

An embodiment of the present application provides an electronic atomization device, comprising:

a susceptor for heating the aerosol-generating substrate to generate an aerosol;

An LC oscillator, comprising an induction coil and a capacitor; the LC oscillator is configured to guide a changing current to flow through the induction coil, thereby driving the induction coil to provide energy to the receptor so that the receptor heats the aerosol generating substrate;

The controller is configured to drive the LC oscillator with an intermittent PWM signal to form a current flowing through the induction coil, and control the pulse density of the PWM signal within a predetermined time so that the energy value provided to the susceptor within the predetermined time is maintained at a preset energy value.

The above “pulse density” is an electrical term, which refers to the number of signal pulses per unit time, or the ratio of the number of signal pulses to time.

In some embodiments, the above predetermined time may be a program execution cycle set by the MCU controller, such as 300ms or 500ms or 1s, etc.; or, the above predetermined time may be the time of the entire heating process, such as 3s/4s, etc.

In some embodiments, it also includes:

An airflow sensor for sensing the user's puffing action;

The controller is configured to drive the LC oscillator with the PWM signal to form a current flowing through the induction coil during the duration of the user's puff action.

In some embodiments, the LC oscillator has a resonant frequency; the frequency of the PWM signal is the same as the resonant frequency of the LC oscillator. Alternatively, the frequency of the PWM signal is constant during the duration of the user's puffing action.

The frequency of the above PWM signal is an electrical term, which refers to the derivative of the period of the PWM pulse signal.

In some embodiments, or during the duration of the user's puffing action, the duty cycle of the PWM signal is constant; specifically, the duty cycle of the PWM signal is fixedly set to 50%.

In some embodiments, within the duration of a single puff action of a user, the predetermined time includes at least a first predetermined time and a second predetermined time that are sequentially advanced; the pulse density of the PWM signal within the second predetermined time is less than the pulse density within the first predetermined time. Alternatively, the duration of a single puff action of a user is divided into a plurality of the predetermined times. A predetermined time; and, along the advancement of the duration of a single puff action of the user, the pulse density of the PWM signal within the predetermined time is reduced.

In some embodiments, it also includes:

Voltage regulator, used to generate a constant voltage;

The controller is configured to control the constant voltage to be provided to the LC oscillator by the PWM signal, thereby driving the LC oscillator to form a current flowing through the induction coil.

In some embodiments, the controller is configured to calculate an amount of energy provided to the susceptor based on a duration for which the constant voltage is provided to the LC oscillator.

In some embodiments, it also includes:

Battery cells, used for power supply;

A first switching tube and a second switching tube;

The capacitor includes a first capacitor and a second capacitor;

The first end of the first capacitor is connected to the positive electrode of the battery cell, and the second end is connected to the first end of the second capacitor; the second end of the second capacitor is connected to the negative electrode of the battery cell; the first end of the induction coil is connected to the second end of the first capacitor, and the second end is connected to the positive electrode of the battery cell through the first switch tube, and is connected to the negative electrode of the battery cell through the second switch tube;

The controller is configured to control the first switch tube with a first PWM signal, and control the second switch tube with a second PWM signal to be alternately turned on and off, so that the LC oscillator guides a varying current to flow through the induction coil.

Another embodiment of the present application further provides an electronic atomization device, comprising:

a susceptor for heating a liquid aerosol-generating substrate to generate an aerosol;

An LC oscillator, comprising an induction coil and a capacitor; the LC oscillator is configured to guide a changing current to flow through the induction coil, thereby driving the induction coil to induce the susceptor to heat the liquid aerosol generating substrate;

An airflow sensor for sensing the user's puffing action;

A controller is configured to drive the LC oscillator with an intermittent PWM signal to form a current flowing through the induction coil during the duration of the user's puff action, and control the The pulse density of the PWM signal is such that the heating temperature of the susceptor is substantially constant.

Another embodiment of the present application further provides a control method for an electronic atomization device, the electronic atomization device comprising:

a susceptor for heating the aerosol-generating substrate to generate an aerosol;

An LC oscillator, comprising an induction coil and a capacitor; the LC oscillator is configured to guide a changing current to flow through the induction coil, thereby driving the induction coil to provide energy to the receptor so that the receptor heats the aerosol generating substrate;

The method comprises:

The LC oscillator is driven by an intermittent PWM signal to form a current flowing through the induction coil, and the pulse density of the PWM signal within a predetermined time is controlled so that the energy value provided to the receptor within the predetermined time is maintained at a preset energy value.

The above electronic atomization device controls the pulse density of the PWM signal during the user's puffing time so that the energy value provided to the receptor is maintained at a preset energy value, thereby maintaining a stable aerosol generation or puffing taste during the puffing time.

BRIEF DESCRIPTION OF THE DRAWINGS

One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

FIG1 is a temperature change curve of a sensor when a magnetic field is generated to induce heating of the sensor in response to the triggering of an existing airflow sensor;

FIG2 is a schematic diagram of an electronic atomization device according to an embodiment;

FIG3 is a schematic diagram of the structure of an embodiment of the circuit in FIG2 ;

FIG4 is a schematic diagram of basic components of one embodiment of the circuit in FIG3 ;

FIG5 is a schematic diagram of a PWM control signal sent by an MCU controller in one embodiment;

FIG6 is a temperature variation curve of a sensor in an embodiment;

FIG. 7 is a schematic diagram of basic components of a circuit in yet another embodiment.

DETAILED DESCRIPTION

In order to facilitate the understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific implementation methods.

One embodiment of the present application provides an electronic atomization device for atomizing an aerosol-forming substrate to generate an aerosol. In some embodiments, the electronic atomization device may include two or more parts that are separated or replaced from each other, which, when combined, form a complete combined use state of the electronic atomization device and can generate an aerosol in response to a user's operation.

In some embodiments, the electronic atomization device can generate an aerosol by heating a liquid aerosol-forming substrate; in some embodiments, the liquid aerosol-forming substrate includes at least one of propylene glycol, glycerin, and the like.

Or in some other embodiments, the electronic atomization device can form an aerosol for inhalation by heating a solid aerosol-forming substrate to volatilize or release at least one component of the solid aerosol-forming substrate. In some implementations, the solid aerosol-forming substrate is preferably a solid substrate, which may include one or more of powder, particles, fragments, strips, or flakes of one or more of herb leaves, dried flowers, herbal crops with volatile aromas, tobacco leaves, homogenized tobacco, and expanded tobacco; or, the solid substrate may contain additional tobacco or non-tobacco volatile aroma compounds to be released when the substrate is heated.

FIG2 shows a schematic diagram of an electronic atomization device according to an embodiment. In this embodiment, the electronic atomization device comprises: an atomizer 100 for atomizing a liquid aerosol-forming substrate to generate an aerosol, and a power supply mechanism 200 for supplying power to the atomizer.

Further, as shown in FIG. 2 , the power supply mechanism 200 includes:

The proximal end 2110 and the distal end 2120 are separated from each other in the longitudinal direction; in use, the proximal end 2110 is the end for receiving the nebulizer 100.

As shown in FIG2 , the power supply mechanism 200 further includes:

The receiving chamber 270 is arranged adjacent to the proximal end 2110 and is arranged along the longitudinal extension of the power supply mechanism 200; and the receiving chamber 270 has an opening along the longitudinal direction toward or located at the proximal end 2110; in use, the atomizer 100 can be received in the receiving chamber 270 through the opening, or removed from the receiving chamber 270.

As shown in FIG2 , the power supply mechanism 200 further includes:

The rechargeable battery cell 210 is used to output power; and the battery cell 210 is close to the distal end 2120 arranged;

The charging interface 240 is used to charge the rechargeable battery cell 210 ; and the charging interface 240 is arranged between the battery cell 210 and the distal end 2120 .

In one embodiment, the DC supply voltage provided by the battery cell 210 is in the range of about 2.5V to about 9.0V, and the amperage of the DC current provided by the battery cell 210 is in the range of about 2.5A to about 20A. In a specific embodiment, the DC supply voltage provided by the battery cell 210 is 3.2V to 4.2V.

As shown in FIG2 , the power supply mechanism 200 further includes:

The circuit 220 is integrated or arranged on a circuit board such as a PCB board, and is used to control the operation of the power supply mechanism 200, and in particular, the circuit 220 controls the power output by the battery cell 210. In FIG. 2 , the circuit 220 is located between the battery cell 210 and the receiving cavity 270.

As shown in FIG2 , the power supply mechanism 200 further includes:

The airflow sensor 250, such as a microphone/MEMS sensor, is used to sense the airflow flowing through the atomizer 100 when the user inhales the atomizer 100; and the circuit 220 controls the battery 210 to output power according to the sensing result of the airflow sensor 250. In the embodiment shown in FIG2, the airflow sensor 250 is arranged to be located between the battery 210 and the receiving cavity 270. And in some other variant embodiments, the airflow sensor 250 can also be assembled, fastened or combined with a circuit board on which the circuit 220 is arranged. Or in some other variant embodiments, the airflow sensor 250 is supported and fixed in the power supply mechanism 200 by an independent supporting element such as a plastic bracket.

In some embodiments, the power supply mechanism 200 induces the nebulizer 100 to heat the atomized liquid aerosol-forming matrix by generating a changing magnetic field passing through the receiving cavity 270; specifically, an induction heating element may be arranged in the nebulizer 100, and when the nebulizer 100 is received in the receiving cavity 270, the changing magnetic field can penetrate and generate heat to heat the liquid aerosol-forming matrix to generate an aerosol.

As shown in FIG2 , the power supply mechanism 200 further includes:

The induction coil 260 is arranged around the receiving cavity 270;

The circuit 220 drives the induction coil 260 at a predetermined frequency to generate an alternating current, thereby causing the induction coil 260 to generate a changing magnetic field that can penetrate the receiving cavity 270. In some embodiments, the frequency of the alternating current supplied by the circuit 220 to the induction coil 260 is between 80KHz～2000KHz; more specifically, the frequency may be in the range of about 600KHz to 1500KHz.

And in some embodiments, the induction coil 260 is wound with a wire material with low resistivity, such as copper wire, silver wire, etc. And in some other embodiments, the induction coil 260 is wound with a Litz wire; Litz wire with multiple strands or multiple bundles of wires is more advantageous for carrying alternating current.

FIG2 shows a schematic diagram of an atomizer 100 according to an embodiment, wherein the atomizer 100 according to the embodiment comprises:

Main housing 10;

The partition wall 11 extends in the main housing 10 along the longitudinal direction of the atomizer 100; and the partition wall 11 and the main housing 10 are integrally molded, for example, molded from a polymer, ceramic or other material; and the partition wall 11 extends to or terminates at the air outlet 111. And a liquid storage chamber 12 is defined between the partition wall 11 and the main housing 10 for storing a liquid aerosol-forming matrix. And, the partition wall 11 surrounds and defines an aerosol output channel located in the main housing 10 for outputting the aerosol to the air outlet 111 during inhalation.

The atomizer 100 further comprises:

The atomization component is used to atomize the liquid aerosol-forming matrix to generate an aerosol; in FIG2 , the atomization component includes a liquid-conducting element 20 for absorbing and storing the liquid aerosol-forming matrix, and a sensor 30 coupled to the liquid-conducting element 20 and used to heat the liquid aerosol-forming matrix to generate an aerosol.

In the embodiment shown in FIG. 2 , the liquid-conducting element 20 is configured to be located inside the partition wall 11; and the liquid-conducting element 20 is configured to be a hollow cylinder extending in the longitudinal direction. In some embodiments, the liquid-conducting element 20 is made of a capillary material or a porous material, such as a sponge, cotton fiber, or a porous body such as a porous ceramic body. The outer surface of the liquid-conducting element 20 is configured as a liquid-absorbing surface for absorbing liquid aerosol from the liquid storage chamber 12 to form a matrix; in some specific embodiments, the partition wall 11 is provided with a plurality of perforations, and the outer surface of the liquid-conducting element 20 absorbs the liquid aerosol in the liquid storage chamber 12 through the perforations to form a matrix. The inner surface of the liquid-conducting element 20 is configured as an atomizing surface; the receptor 30 is combined with the inner surface of the liquid-conducting element 20 to heat at least part of the liquid aerosol in the liquid-conducting element 20 to form a matrix to generate an aerosol.

In some other embodiments, the liquid-conducting element 20 may also be configured to have various regular or irregular shapes, and partially be in fluid communication with the liquid storage chamber 12 to receive the liquid aerosol-forming substrate. Alternatively, in other variations, the liquid-conducting element 20 may have more regular or irregular shapes, such as a polygonal block, a groove shape with grooves on the surface, or an arch shape with a hollow channel inside.

Or in some other variations, the susceptor 30 may be combined with the liquid-conducting element 20 by printing, deposition, sintering or physical assembly. In some other variations, the liquid-conducting element 20 may have a plane or a curved surface for supporting the susceptor 30, and the susceptor 30 is formed on the plane or the curved surface of the liquid-conducting element 20 of the porous body by mounting, printing, deposition or the like.

In the embodiment shown in FIG. 2 , the susceptor 30 is an induction heating element that can be penetrated by a changing magnetic field and generate heat. The susceptor 30 is made of a metal or alloy having sensitivity. For example, the susceptor 30 can be made of stainless steel of grade 430 (SS430), and can also be made of stainless steel of grade 420 (SS420), and alloy materials containing iron and nickel (such as permalloy). In some specific embodiments, the susceptor 30 has a length of 2 mm to 10 mm; and the susceptor 30 has an inner diameter of 1.5 mm to 8 mm; and the wall thickness of the susceptor 30 is between 0.05 mm and 0.2 mm. For example, in some specific embodiments, the susceptor 30 has a length of 4 mm to 8 mm. As shown in FIG. 2 , the susceptor 30 is a tubular shape that is closed in the circumferential direction; and the susceptor 30 is a mesh structure, and the susceptor 30 has a plurality of holes arranged in an array for releasing aerosols.

Or in some other variations, the sensor 30 may be configured in a solenoid shape, or a more cylindrical shape.

In the embodiment shown in FIG. 2 , the extension length of the induction coil 260 is 6 to 15 mm; and the induction coil 260 has approximately 6 to 12 turns; the length of the susceptor 30 is less than the length of the induction coil 260; and when the atomizer 100 is received in the receiving chamber 270, the susceptor 30 is substantially completely located in the induction coil 260.

FIG3 shows a schematic diagram of the structure of a circuit 220 according to an embodiment. In this embodiment, the circuit 220 includes:

MCU controller 221;

An LC oscillator 222 composed of an induction coil 260 and a capacitor; in some embodiments, the LC oscillator 222 may be an asymmetric LC oscillator 222 composed of a capacitor and the induction coil 260 and having only one oscillation bridge arm; or in some other embodiments, the LC oscillator 222 may be a symmetric LC oscillator 222 composed of two capacitors and the induction coil 260 and having two symmetric oscillation bridge arms;

The half bridge 224 (a basic term in the electrical field) includes two switch tubes and is located between the battery cell 210 and the LC oscillator 222;

In use, when the airflow sensor 250 senses the user's inhalation, the MCU controller 221 controls the on/off of the switch tube in the half bridge 224 according to the sensing of the airflow sensor 250, so that the LC oscillator 222 oscillates, thereby forming an alternating current flowing through the induction coil 260 and generating a magnetic field to induce heating of the receptor 30.

FIG. 4 is a schematic diagram showing basic components of a specific embodiment of the circuit 220 in FIG. 3 ; as shown in FIG. 4 , the circuit 220 includes:

The symmetrical LC oscillator 222 includes an induction coil 260 and capacitors C1 and C2; and the capacitors C1 and C2 respectively form symmetrical bridge arms with the induction coil 260;

The half bridge 224 includes a switch tube Q1 and a switch tube Q2. Specifically, in this embodiment, the connection mode of the half bridge 224 and the symmetrical LC oscillator 222 is:

The first end of capacitor C1 is connected to the positive electrode of battery cell 210, and the second end is connected to the first end of capacitor C2; the second end of capacitor C2 is connected to the negative electrode of battery cell 210; the first end of induction coil 260 is connected to the second end of capacitor C1, and the second end is connected to the positive electrode of battery cell 210 through switch tube Q1, and is connected to the negative electrode of battery cell 210 through switch tube Q2.

The switch tube Q1 is turned on and off by a first PWM control signal sent by the MCU controller 221 , and the switch tube Q2 is turned on and off by a second PWM control signal sent by the MCU controller 221 .

In some embodiments, for such electronic atomization devices that need to respond to the user's puffing action to generate aerosol as quickly as possible, the frequency of the PWM control signal is usually adapted to the inherent resonant frequency of the symmetrical LC oscillator 222, so that the LC oscillator 222 oscillates basically at the maximum resonant efficiency and generates aerosol as quickly as possible. In the embodiment, for such symmetrical LC oscillator 222, the frequency of the PWM control signal issued by the MCU controller 221 is to prevent the LC oscillator 222 from being unable to resonate and unable to provide aerosol when the frequency of the PWM control signal does not match the inherent resonant frequency of the LC oscillator 222.

In some embodiments, in the control of the half-bridge inverter, the switch tube Q1 and the switch tube Q2 are alternately turned on and off; then the first PWM control signal sent by the MCU controller 221 to the switch tube Q1 and the second PWM control signal sent to the switch tube Q2 usually have complementary duty cycles. Furthermore, for such a symmetrical LC oscillator 222, in the oscillation control process, since it is necessary to make the oscillation process (usually including the positive process and the negative process) symmetrical; then the duty cycle of the PWM control signal sent by the MCU controller 221 to the switch tube Q1 and the PWM control signal sent to the switch tube Q2 are both fixedly set to 50%, and are basically constant.

For example, FIG. 5 shows a schematic diagram of a first PWM control signal for controlling the switch tube Q1 to be turned on and off and a second PWM control signal for controlling the switch tube Q2 to be turned on and off, which is sent by the MCU controller 221 in one embodiment.

As shown in FIG5 , the first PWM control signal and the second PWM control signal are both pulsed square waves. The high/low level in the first PWM control signal is opposite to the high/low level in the second PWM control signal. Also, the first PWM control signal and the second PWM control signal are simultaneous. Also, the duty cycle of the first PWM control signal and the duty cycle of the second PWM control signal are the same, both 50%. Also, the periods of the first PWM control signal and the second PWM control signal are the same, both T1. Also, the frequencies of the first PWM control signal and the second PWM control signal are the same.

In some embodiments, when the airflow sensor 250 senses the user's puffing action and is triggered, the MCU controller 221 controls the issuance of the first PWM control signal and the second PWM control signal according to the trigger signal of the airflow sensor 250 .

In the embodiment of FIG. 5 , the MCU controller 221 controls the pulse density (the ratio of the number of pulses to time, i.e., the ratio of the number of pulses to the puff duration t100) of the first PWM control signal and the second PWM control signal according to the PDM (pulse density modulation) modulation mode within the puff duration t100 of the user sensed by the airflow sensor 250; and the pulse density of the first PWM control signal and the second PWM control signal is determined by the MCU controller 221 based on the pulse density modulation mode. The preset energy value required to be provided to the receptor 30 is modulated in a PDM modulation manner.

For example, in some specific embodiments, the preset energy value provided to the receptor 30 set in the MCU controller 221 is 35J/3s. That is, when the puffing time t100 of a normal user is 3s, the energy required to be provided to the receptor 30 is 35J to output the control signal.

Or in some other descriptions, the MCU controller 221 modulates the pulse density of the PWM control signal according to the preset energy value provided to the receptor 30 per unit time, wherein the energy provided to the receptor 30 per unit time is 35 J/3 s=11.66667 J/s.

In this embodiment, when the duty cycle and frequency of the PWM control signal need to remain unchanged, the pulse density modulation of the first PWM control signal and the second PWM control signal is performed based on the preset energy value provided to the susceptor 30, so as to make the energy provided to the susceptor 30 substantially uniform within the puffing time t100. When the energy provided to the susceptor 30 is substantially uniform, the temperature curve of the susceptor 30 heated by the eddy current effect is in the form shown in FIG6 ; in FIG6 , due to the temperature sensitivity of the eddy current heating, the temperature of the susceptor 30 rises from room temperature to temperature T0 instantly, and then substantially remains constant near temperature T0 to generate aerosol. Thus, within a single puffing time or a single heating cycle, the aerosol generation efficiency is substantially uniform at a substantially constant temperature, so that the aerosol has a better taste than the existing gradually increasing temperature in FIG1 .

In the specific embodiment shown in FIG5 , the MCU controller 221 modulates the interval time between the PWM control signals by PDM modulation to change the pulse density of the PWM control signals. For example, specifically, the interval time between adjacent PWM control signals, such as the interval time t11 and the interval time t21 shown in FIG5 , is modulated by PDM to change the pulse density of the PWM control signals.

In some embodiments, the pulse density of the PWM control signal is substantially constant during a plurality of predetermined times (eg, 1 second) within the puff duration t100 (eg, 3 seconds) sensed by the airflow sensor 250 .

Or in some other embodiments, during a plurality of predetermined times (e.g., 1 second) of a single puff duration t100 (e.g., 3 seconds) sensed by the airflow sensor 250, the pulse density of the PWM control signal is gradually reduced. The purpose of this setting is that at the beginning of a single puff, for example, at the 1st second, since the receptor 30 is at a normal temperature (or cold state), the pulse density of the PWM control signal is gradually reduced. It may require relatively more energy to rise to the temperature T0, but relatively less energy is required to maintain the corresponding temperature immediately at the 2nd or 3rd second because the susceptor 30 has reached a considerable temperature (or hot state). As a result, as the duration of the puff progresses, the pulse density of the PWM control signal in the 2nd or 3rd second is less than that in the 1st second, so that it is favorable for the susceptor 30 to present the temperature curve of FIG. 6 .

As shown in FIG4 , the circuit 220 further includes:

The voltage regulator 223 is, for example, a commonly used boost chip or buck voltage regulator chip; the voltage regulator 223 is connected between the positive electrode of the battery cell 210 and the half bridge 224, and the purpose is to provide a constant driving voltage to the LC oscillator 222. In use, as the battery cell 210 is continuously discharged, the output voltage of the positive electrode of the battery cell 210 gradually decreases, for example, the output voltage of the positive electrode of the battery cell 210 is 4.2V when fully charged, and the output voltage is as low as 3.2V when the battery cell 210 is at low power; the voltage regulator 223 can output a constant driving voltage to the LC oscillator 222, such as 4.0V, 4.5V or 6.0V. After the constant output voltage is formed by the voltage regulator 223, it is beneficial for the MCU controller 221 to calculate and provide balanced energy to the sensor 30.

Since the energy value provided to the receptor 30 by the induction coil 260 in the LC oscillator 222 through the magnetic field is related to the duration of the constant voltage output to the LC oscillator 222 by the voltage regulator 223, and is basically positively correlated, in the embodiment, when the voltage regulator 223 outputs a stable driving voltage such as 4.0V, 4.5V or 6.0V, the MCU controller 221 can calculate the energy value provided to the receptor 30 only by the sum of the conduction time of the switch tube Q1 and the switch tube Q2 in the half bridge 224. However, when there is no voltage regulator 223 to provide a stable driving voltage, it is difficult to calculate the energy value provided to the receptor 30 based on the positive voltage with large fluctuations output by the battery cell 210.

Specifically in FIG5 , the voltage regulator 223 uses a commonly used boost chip, and the main electronic components include:

Boost inductor L1, providing boost;

Filter capacitor C3 is used to filter and output the boosted voltage;

A voltage divider resistor R21 and a resistor R22 connected in series;

Switch tube Q3 and switch tube Q4; in use, the MCU controller 221 determines the boosted voltage value by monitoring the voltage divided by the resistor R22, and then controls the switch tube Q3 The on/off control of the switch tube Q4 keeps the boosted voltage value at the desired preset value, such as 4.0V, 4.5V or 6.0V.

Alternatively, FIG. 7 shows a schematic diagram of basic components of a circuit 220 of yet another embodiment; in the embodiment shown in FIG. 7 , the circuit 220 includes:

The asymmetric LC oscillator 222a has only one bridge arm, which is composed of a capacitor C2 and an induction coil 260a connected in series;

The half bridge 224a includes a switch tube Q1 and a switch tube Q2;

A voltage regulator 223a, electrically connected between the half bridge 224a and the positive electrode of the battery cell 210;

The MCU controller 221a controls the on/off state of the switch tube Q1 by sending a first PWM control signal to the switch tube Q1, and controls the on/off state of the switch tube Q2 by sending a second PWM control signal to the switch tube Q2.

In the embodiment of Figure 7, the MCU controller 221a can use the method shown in Figure 5 to emit a first PWM control signal and a second PWM control signal with a constant frequency of the inherent resonant frequency and a constant duty cycle of 50%; and, the MCU controller 221a can modulate the pulse density of the first PWM control signal and/or the second PWM control signal based on a preset energy value required to be provided to the receptor 30 within the triggering duration of the airflow sensor 250.

In the above embodiment, the circuit 220 drives the oscillation of the LC oscillator 222 / 222 a through the half bridge 224 / 224 a including the switch tube Q1 and the switch tube Q2 .

Or in some other embodiments, the circuit 220 drives the oscillation of the LC oscillator 222/222a through a symmetrical full bridge or H bridge. The full bridge or H bridge is a basic term in the field of electricity. Its shape resembles the letter H, so it is named "H bridge". Specifically, it includes four switch tubes forming the four vertical legs of H, and the series-connected LC oscillator 222a load is the horizontal bar in the H bridge; thus forming a full bridge drive or H bridge drive. And the oscillation of the LC oscillator 222/222a driven by the full bridge or H bridge is also symmetrical.

And in a similar embodiment, the MCU controller 221a can modulate the pulse density of the PWM control signal based on the preset energy value required to be provided to the sensor 30 within the triggering duration of the airflow sensor 250, and then control the conduction and disconnection of the four switching tubes in the full bridge or H bridge to control the oscillation of the LC oscillator 222a.

It should be noted that the preferred embodiments of the present application are given in the specification and drawings of the present application, but are not limited to the embodiments described in the specification. Furthermore, it is possible for a person of ordinary skill in the art to make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the claims attached to the present application.

Claims (10)

An electronic atomization device, characterized by comprising: a susceptor for heating the aerosol-generating substrate to generate an aerosol; An LC oscillator, comprising an induction coil and a capacitor; the LC oscillator is configured to guide a changing current to flow through the induction coil, thereby driving the induction coil to provide energy to the receptor so that the receptor heats the aerosol generating substrate; The controller is configured to drive the LC oscillator with an intermittent PWM signal to form a current flowing through the induction coil, and control the pulse density of the PWM signal within a predetermined time so that the energy value provided to the susceptor within the predetermined time is maintained at a preset energy value. The electronic atomization device according to claim 1, further comprising: An airflow sensor for sensing the user's puffing action; The controller is configured to drive the LC oscillator with the PWM signal to form a current flowing through the induction coil during the duration of the user's puff action. The electronic atomization device as described in claim 1 or 2 is characterized in that the LC oscillator has a resonant frequency; the frequency of the PWM signal is the same as the resonant frequency of the LC oscillator. The electronic atomization device as described in claim 1 or 2 is characterized in that the duty cycle of the PWM signal is 50%. The electronic atomization device as described in claim 2 is characterized in that, within the duration of a single puff action of the user, the predetermined time at least includes a first predetermined time and a second predetermined time that advance in sequence; and the pulse density of the PWM signal in the second predetermined time is less than the pulse density in the first predetermined time. The electronic atomization device according to claim 1 or 2, further comprising: Voltage regulator, used to generate a constant voltage; The controller is configured to control the constant voltage to be provided to the LC oscillator by the PWM signal, thereby driving the LC oscillator to form a current flowing through the induction coil. The electronic atomization device as described in claim 6 is characterized in that the controller is configured to calculate the energy value provided to the receptor based on the length of time that the constant voltage is provided to the LC oscillator. The electronic atomization device according to claim 1 or 2, further comprising: Battery cells, used for power supply; A first switching tube and a second switching tube; The capacitor includes a first capacitor and a second capacitor; The first end of the first capacitor is connected to the positive electrode of the battery cell, and the second end is connected to the first end of the second capacitor; the second end of the second capacitor is connected to the negative electrode of the battery cell; the first end of the induction coil is connected to the second end of the first capacitor, and the second end is connected to the positive electrode of the battery cell through the first switch tube, and is connected to the negative electrode of the battery cell through the second switch tube; The controller is configured to control the first switch tube with a first PWM signal, and control the second switch tube with a second PWM signal to be alternately turned on and off, so that the LC oscillator guides a varying current to flow through the induction coil. An electronic atomization device, characterized by comprising: a susceptor for heating a liquid aerosol-generating substrate to generate an aerosol; An LC oscillator, comprising an induction coil and a capacitor; the LC oscillator is configured to guide a changing current to flow through the induction coil, thereby driving the induction coil to induce the susceptor to heat the liquid aerosol generating substrate; An airflow sensor for sensing the user's puffing action; The controller is configured to drive the LC oscillator with an intermittent PWM signal to form a current flowing through the induction coil during the duration of the user's puffing action, and control the pulse density of the PWM signal to keep the heating temperature of the susceptor substantially constant. A control method for an electronic atomization device, the electronic atomization device comprising: a susceptor for heating the aerosol-generating substrate to generate an aerosol; An LC oscillator comprises an induction coil and a capacitor; the LC oscillator is configured to guide a changing current to flow through the induction coil, thereby driving the induction coil to the induction coil. The device provides energy to enable the receptor to heat the aerosol generating substrate; Characterized in that the method comprises: The LC oscillator is driven by an intermittent PWM signal to form a current flowing through the induction coil, and the pulse density of the PWM signal within a predetermined time is controlled so that the energy value provided to the receptor within the predetermined time is maintained at a preset energy value.