Aerosol generating device

Abstract

The invention relates to an aerosol generating device, comprising: a power supply circuit for providing a DC power source; the driving circuit is used for outputting a driving signal; and the electromagnetic heating circuit is connected with the power supply circuit, is connected with a power supply, is connected with the driving circuit, and is used for generating a high-frequency alternating magnetic field according to the driving signal so as to excite a receptor in the high-frequency alternating magnetic field to heat. A direct-current power supply is provided through the power supply circuit, a driving signal is output through the driving circuit, and a high-frequency alternating magnetic field is generated through the electromagnetic heating circuit according to the driving signal so as to excite a receptor in the high-frequency alternating magnetic field to heat. By utilizing the advantages that the even-order harmonic electromagnetic heating circuit after noise reduction can work at a relatively high working frequency and is low in power loss, the heating efficiency of the electromagnetic heating circuit can be improved, and the energy consumption and the fault risk of the smoking set can be reduced.

Description

Technical Field

[0001] The present invention relates to the field of electronic cigarette heating, and in particular to an aerosol generating device. Background Art

[0002] In smoking devices that utilize the principle of electromagnetic heating, the receptor is first embedded in the aerosol-generating matrix in the cigarette cartridge, and then a coil surrounding the outside of the cigarette cartridge chamber is coupled with the receptor to achieve eddy current heating of the cigarette cartridge under the control of the circuit system.

[0003] Some products on the market use the smoking device circuit described in patent CN110522092A, but the problem is that when the operating frequency is high, it will not be possible to construct a relatively ideal voltage waveform, and the unsatisfactory voltage waveform will cause the switch circuit in the heating circuit to form a large power loss. In addition, there must be parasitic resistance in the inductance and capacitance of the inverter circuit, and the saturation voltage, saturation resistance and operating current drop time of the switch circuit are not zero. These unfavorable factors will lead to further power loss of the circuit. In general, the inverter circuit is not suitable for working at a higher operating frequency and has the defect of high power loss, which can easily damage electronic devices and cause smoking device failure. Summary of the invention

[0004] The technical solution adopted by the present invention to solve the technical problem is: construct an aerosol generating device, comprising:

[0005] A power supply circuit, used for providing a DC power supply;

[0006] A driving circuit, used for outputting a driving signal;

[0007] The electromagnetic heating circuit is connected to the power supply circuit and the driving circuit, and generates a high-frequency alternating magnetic field according to the driving signal to stimulate the receptor in the high-frequency alternating magnetic field to generate heat.

[0008] In one embodiment, the high frequency of the high frequency alternating magnetic field is 1 MHz to 40 MHz.

[0009] In one embodiment, the electromagnetic heating circuit includes a fundamental wave resonant circuit, an odd wave resonant circuit, a choke, a switch circuit, and a coil;

[0010] The choke is connected in series between the first end of the switch circuit and the power supply circuit to prevent the resonant signal from passing through, the second end of the switch circuit is grounded, and the control end of the switch circuit is connected to the drive signal, so that the switch circuit is alternately turned on and off according to the drive signal, so that the first end input to the switch circuit outputs a square wave signal;

[0011] One end of the fundamental resonance circuit is connected to the ground via the odd-wave resonance circuit, and the other end of the fundamental resonance circuit is connected to the ground via the coil, and the connection point between the fundamental resonance circuit and the odd-wave resonance circuit is also connected to the first end of the switch circuit, so that when the switch circuit is alternately turned on and off, a fundamental signal and an odd-harmonic signal are respectively input to the first end of the switch circuit through the fundamental resonance circuit and the odd-wave resonance circuit, so that a square wave signal input to the first end of the switch circuit is constructed through the fundamental signal and the odd-harmonic signal, and the coil is powered by the fundamental signal flowing through the fundamental resonance circuit to excite the receptor to generate heat.

[0012] In one embodiment, the fundamental resonance circuit includes an inductor L1 and a capacitor C1, one end of the inductor L1 is connected to the odd harmonic resonance circuit and the first end of the switch circuit, and the other end of the inductor L1 is connected to the coil via the capacitor C1.

[0013] In one of the embodiments, the odd harmonic resonant circuit includes a third harmonic resonant circuit, and the third harmonic resonant circuit is connected to the first end of the switch circuit to provide a transmission path for the third harmonic signal in the odd harmonic signal.

[0014] In one embodiment, the third harmonic resonant circuit includes an inductor L2 and a capacitor C2, one end of the inductor L2 is connected to the fundamental harmonic resonant circuit and the first end of the switch circuit, and the other end of the inductor L2 is connected to the ground via the capacitor C2.

[0015] In one embodiment, the odd harmonic resonant circuit also includes a fifth high-frequency odd resonant circuit, which is connected to the first end of the switching circuit to provide a transmission path for the fifth harmonic signal in the odd harmonic signal to avoid the fifth harmonic signal being superimposed on the fundamental signal.

[0016] In one embodiment, the switch circuit includes an NMOS transistor.

[0017] In one embodiment, the choke comprises a choke coil.

[0018] In one embodiment, the generated square wave signal utilizes even harmonics to achieve heating.

[0019] In one embodiment, the output current i D Between 0.5 amps and 5 amps.

[0020] In one embodiment, the driving circuit includes an N-type transistor Q1 and a P-type transistor Q2; the input end of the N-type transistor Q1 is used to access a power supply, the output end of the N-type transistor Q1 is connected to the input end of the P-type transistor Q2, the output end of the P-type transistor Q2 is grounded, and the control ends of the N-type transistor Q1 and the P-type transistor Q2 are used to access an input signal with a fixed frequency, so that the N-type transistor Q1 and the P-type transistor Q2 are turned on or off based on the input signal, so as to output a driving signal with a fixed frequency through the output end of the N-type transistor Q1.

[0021] Implementing the technical solution of the present invention has the following beneficial effects:

[0022] The present invention provides a DC power supply through a power supply circuit, outputs a driving signal through a driving circuit, and generates a high-frequency alternating magnetic field through an electromagnetic heating circuit according to the driving signal to stimulate a receptor in the high-frequency alternating magnetic field to generate heat. The electromagnetic heating circuit with even harmonics after noise reduction can operate at a higher operating frequency and has the advantages of low power loss, which can improve the heating efficiency of the electromagnetic heating circuit and help reduce the energy consumption and failure risk of the smoking device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0024] Figure 1 is a circuit structure block diagram of an aerosol generating device according to an embodiment of the present invention;

[0025] Figure 2 is a circuit schematic diagram of a driving circuit according to an embodiment of the present invention;

[0026] Figure 3 is a circuit schematic diagram of an electromagnetic heating circuit according to an embodiment of the present invention;

[0027] Figure 4 is a schematic diagram of a harmonic component supplementation application circuit according to an embodiment of the present invention;

[0028] Figure 5 is a waveform diagram of a square wave signal according to an embodiment of the present invention;

[0029] Figure 6 It is a waveform diagram of a driving signal, a change in input current at a first end of a switch circuit, a change in voltage between a first end and a second end of the switch circuit, and a change in voltage across an equivalent resistance of a coil during a process of exciting a receptor to generate heat according to an embodiment of the present invention;

[0030] Figure 7 It is a waveform diagram of Fourier decomposition of a square wave signal according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Please refer to Figure 1 In one embodiment, an aerosol generating device is provided, which includes a power supply circuit 1, a driving circuit 2 and an electromagnetic heating circuit 3.

[0033] The power supply circuit 1 is used to provide a DC power supply to the electromagnetic heating circuit 3. The power supply circuit 1 can be an existing DC source, a switching power supply, a battery or a linear power supply, as long as it can provide a stable DC source, and is not limited here.

[0034] In one embodiment, the output voltage range of the DC power supply may be between 3 volts and 24 volts, and the output current range of the DC power supply may be between 0.5 amperes and 5 amperes.

[0035] The driving circuit 2 is used to output a driving signal.

[0036] Please refer to Figure 2 In one embodiment, the driving circuit 2 includes an N-type transistor Q1 and a P-type transistor Q2; the input end of the N-type transistor Q1 is used to access the power supply VCC, the output end of the N-type transistor Q1 is connected to the input end of the P-type transistor Q2, the output end of the P-type transistor Q2 is grounded, and the control end of the N-type transistor Q1 and the control end of the P-type transistor Q2 are used to access the input signal with a fixed frequency, so that the N-type transistor Q1 and the P-type transistor Q2 are turned on or off based on the input signal, so as to output a driving signal with a fixed frequency through the output end of the N-type transistor Q1, so that the switch circuit 31 is alternately turned on and off at a fixed frequency, thereby forming a stable square wave signal at the first end of the switch circuit 31.

[0037] Please refer to Figure 2In one embodiment, the driving circuit 2 may further include a resistor R1 and a capacitor C3. One end of the resistor R1 is input with the input signal, and the other end is connected to the control end of the N-type transistor Q1 and the control end of the P-type transistor Q2. The capacitor C3 is connected in parallel with the resistor R1. The capacitor C3 and the resistor R1 form a coupling circuit, which can stably transmit the high-frequency input signal to the control end of the N-type transistor Q1 and the P-type transistor Q2, which helps to stabilize the driving signal at a fixed frequency and improve the stability of the driving signal.

[0038] In some embodiments, the input signal can be provided by an existing crystal oscillator circuit or a high-frequency crystal oscillator, and the error range of the input signal can be controlled within 100ppm. This can improve the stability of the driving signal, help to more stably control the heating power of the sensor, and play a positive role in improving user experience.

[0039] Please refer to Figure 2 In one embodiment, the N-type transistor Q1 is an NPN transistor, the control end of the N-type transistor Q1 corresponds to the base of the NPN transistor, the input end of the N-type transistor Q1 corresponds to the collector of the NPN transistor, and the output end of the N-type transistor Q1 corresponds to the emitter of the NPN transistor. Of course, the N-type transistor Q1 can also be replaced by other types of switching transistors, such as NMOS transistors.

[0040] Please refer to Figure 2 In one embodiment, the P-type transistor Q2 is a PNP transistor, the control end of the P-type transistor Q2 corresponds to the base of the PNP transistor, the input end of the P-type transistor Q2 corresponds to the emitter of the PNP transistor, and the output end of the P-type transistor Q2 corresponds to the collector of the PNP transistor. Of course, the P-type transistor Q2 can also be replaced by other types of switching transistors, such as PMOS transistors.

[0041] In one embodiment, the frequency range of the high-frequency alternating magnetic field is 1 MHz to 40 MHz. Considering the matching factors such as the shape and size of the cigarette cartridge, the coil inductance and the resonant capacitor configuration, the frequency range of the high-frequency alternating magnetic field is preferably between 3 MHz and 15 MHz.

[0042] Among them, the electromagnetic heating circuit 3 is connected to the power supply circuit 1 to obtain electric energy; the electromagnetic heating circuit 3 is also connected to the drive circuit 2 to generate a high-frequency alternating magnetic field according to the drive signal to stimulate the receptors in the high-frequency alternating magnetic field to generate heat.

[0043] Please refer to Figure 3In one embodiment, the electromagnetic heating circuit includes a switch circuit 31, a choke 32, a coil 33, a fundamental wave resonant circuit 34 and an odd harmonic resonant circuit 35. The choke 12 is connected in series between the first end of the switch circuit and the power supply circuit to prevent the resonant signal from passing through. The second end of the switch circuit is grounded. The control end of the switch circuit is connected to the drive signal, so that the switch circuit is alternately turned on and off according to the drive signal, so that the first end input to the switch circuit outputs a square wave signal; one end of the fundamental wave resonant circuit is connected to the ground through the odd wave resonant circuit, and the other end of the fundamental wave resonant circuit is connected to the ground through the coil. The connection point of the fundamental wave resonant circuit and the odd wave resonant circuit is also connected to the first end of the switch circuit, so that during the process of the switch circuit being alternately turned on and off, the fundamental wave signal and the odd harmonic signal are respectively input to the first end of the switch circuit through the fundamental wave resonant circuit and the odd wave resonant circuit, so that the square wave signal input to the first end of the switch circuit is constructed through the fundamental wave signal and the odd harmonic signal, and the coil is also powered by the fundamental wave signal flowing through the fundamental wave resonant circuit to stimulate the sensor to heat up.

[0044] refer to Figure 4 , combined with the mathematical principle of decomposing a periodic function into the sum of simple oscillation functions by using Fourier series expansion, a description is made of the Fourier decomposition of the RF circuit in the smoking device of the present invention, thereby explaining the application logic of the present invention and the selection ideas for filtering harmonics.

[0045] Any periodic waveform can be decomposed into a DC component and higher harmonic components (including odd and even orders). Here, the square wave can be expanded into a fundamental wave of a specific frequency and 2k+1 (k=1, 3, 5...) higher harmonics through Fourier series.

[0046] Specifically, the Fourier series expansion formula is: Among them, ω = 2π / T, called the fundamental frequency, T is the period; a0 is a constant (often called the DC component); a n or b n is the amplitude of the nth harmonic, and the amplitude is determined by expression (1), which is expressed as:

[0047]

[0048] Assume that the square wave signal input to the first terminal of the switch circuit 11 is as follows: Figure 4 As shown, the square wave signal can be expressed by expression (2), which is: Where -h is the valley value of the square wave signal, and h is the peak value of the square wave signal. Based on expressions (1) and (2), we can get that a0=0, a n =0, Furthermore, a0=0, an =0, Substituting into the Fourier series expansion formula, we can get expression (3), which is expressed as: From expression (3), we can see that the square wave signal can be constructed from the fundamental signal and the odd harmonic signal.

[0049] Please refer to Figure 5 , V GS Indicates the voltage change of the driving signal; i D represents the current change input to the first end of the switch circuit 11; V DS represents the voltage change between the first terminal and the second terminal of the switch circuit 11; V RL It represents the voltage change across the equivalent resistance of the coil 13 during the process of exciting the receptor to generate heat, that is, the fundamental wave signal.

[0050] Please refer to Figure 3 and Figure 5 , in the ideal circuit model, when V GS When the level is high, the switch circuit 11 is turned on, and the impedance between the first end and the second end of the switch circuit 11 is in a low resistance state due to the connection, causing the DC power supply VI to flow to the ground through the choke 12 and the switch circuit 11, which will cause the large current i input to the first end of the switch circuit 11 to D surge, and because the on-resistance of the switch circuit 11 is small and stable, during the on-state of the switch circuit 11, the current i D Keep a constant value i DM , while V DS Then it is 0V, when V GS When the level is low, the switch circuit 11 is turned off, and the impedance between the first end and the second end of the switch circuit 11 is in a high impedance state, so that the current i flowing into the first end of the switch circuit 11 is D The voltage drops to 0A, so the current signals at the first end and the second end of the switch circuit 11 are in a square wave shape.

[0051] When the switch circuit 11 is turned off, the DC power supply VI starts to be input into the fundamental resonance circuit 14 and the odd harmonic resonance circuit 15 through the choke 12, so that the fundamental resonance circuit 14 and the odd harmonic resonance circuit 15 resonate, so that V DSIt is in the shape of a half-sine wave. When the next conduction cycle of the switch circuit 11 arrives, the impedance between the first end and the second end of the switch circuit 11 is in a low-resistance state, and the harmonic signals flowing through the fundamental resonance circuit 14 and the odd harmonic resonance circuit 15 will be superimposed at the first end of the switch circuit 11. Because the choke 12 produces a very high impedance to the high-frequency signal, it will prevent the high-frequency resonance signal (such as the fundamental signal and the odd harmonic signal) from flowing into the power supply circuit and the high-frequency resonance signal output by the power supply circuit from flowing into the first end of the switch circuit 11, resulting in the harmonic signal flowing through the fundamental resonance circuit 14 and the odd harmonic resonance circuit 15 can only flow into the ground through the first end and the second end of the switch circuit 11.

[0052] Since the square wave signal at the first end of the switch circuit 11 can be composed of a fundamental wave signal and an odd harmonic signal, and the current at the first end of the switch circuit 11 is in a square wave shape, as long as the fundamental wave resonant circuit 14 is set to generate a very high impedance to high-frequency resonant signals (such as third and above odd harmonic signals) and a very low impedance to fundamental wave signals, the current flowing through the fundamental wave resonant circuit 14 is a fundamental wave signal, and the waveform of the fundamental wave signal can be referred to as follows. Figure 5 V RL Waveform diagram, in this way, the first end of the switch circuit 11 can not only obtain the fundamental signal constituting the square wave signal from the fundamental resonance circuit 14, but also the fundamental signal will flow through the coil 13 while flowing through the fundamental resonance circuit 14 to power the coil; then the odd harmonic resonance circuit 15 is set to a resonance circuit that produces very low impedance to the high-frequency resonance signal and very high impedance to the fundamental signal, so that the odd harmonic signal constituting the square wave signal can be obtained from the odd harmonic resonance circuit 15. Under the action of the odd harmonic resonance circuit 15, the odd harmonic signal will be preferentially transmitted through the odd harmonic resonance circuit 15, and will not flow into the fundamental resonance circuit 14, so that the power supply signal of the coil 13 can be prevented from being superimposed with high-frequency harmonics, so that the fundamental signal remains a standard sine wave. It can be understood that this embodiment controls the switch circuit 11 to be alternately turned on and off so that the current input to the first end of the switch circuit 11 remains as a square wave signal. At the same time, with the cooperation of the choke 12, the fundamental resonance circuit 14 and the odd harmonic resonance circuit 15, the current flowing through the fundamental resonance circuit 14 and supplying power to the coil 13 remains as a fundamental signal, thereby achieving the effect of driving the coil 13 with the fundamental signal. Since the fundamental signal has no superimposed harmonics of other frequencies, it has the advantages of less noise and stable waveform, which facilitates temperature regulation control (such as PID control) and reduces interference in the circuit, which helps the circuit system to achieve accurate heating, temperature measurement and temperature control.

[0053] In one embodiment, the choke 12 may include a choke coil, which may have a large impedance to high frequency harmonics. Figure 3In the embodiment, the choke acts as a bias to isolate the influence of high-frequency harmonics on the DC bias, that is, to prevent the harmonics output by the fundamental resonance circuit 14 and the odd harmonic resonance circuit 15 from flowing through the choke.

[0054] Please refer to Figure 3 In one embodiment, the fundamental wave resonant circuit 14 includes an inductor L1 and a capacitor C1, one end of the inductor L1 is connected to the odd harmonic resonant circuit 15 and the first end of the switch circuit, and the other end of the inductor L1 is connected to the coil 13 via the capacitor C1. The inductor L1 and the capacitor C1 form a resonant circuit with high impedance to high-frequency resonant signals and low impedance to fundamental wave signals, so that the resonant circuit can provide a stable fundamental wave signal to the coil 13. In this embodiment, the resonant frequency of the fundamental wave resonant circuit 14 can be controlled by adjusting the parameters of the inductor L1 and the capacitor C1.

[0055] Please refer to Figure 3 In one embodiment, the odd harmonic resonant circuit 15 includes a third harmonic resonant circuit 151, which is connected to the first end of the switch circuit to provide a transmission path for the third harmonic signal in the odd harmonic signal to avoid the third harmonic signal being superimposed on the fundamental signal. Specifically, it can be seen from expression (3) that the amplitude of the odd harmonic signal is given by Therefore, the higher the order of the odd harmonic signal (that is, the larger n is), the smaller the amplitude of the odd harmonic signal is, and it can be referred to Figure 6 It can be seen that the influence of odd harmonic signals on square wave signals will also decrease as the amplitude of odd harmonic signals decreases. Although the fundamental signal and multiple odd harmonic signals can be superimposed without restriction to synthesize the most ideal square wave signal, considering the number of components of the control circuit and the volume of the equipment, this embodiment only considers the formation of a third harmonic resonant circuit 151 to limit the third harmonic signal with the greatest influence in the odd harmonic signal to be transmitted in the third harmonic resonant circuit 151, so as to avoid the third harmonic signal component being superimposed on the fundamental signal, and then the coil 13 is powered by a relatively stable fundamental signal with less noise.

[0056] Because multiple (2k+1) odd harmonic elimination circuits are constructed, in order to generate heating using only even harmonic components, the current square wave is calculated as follows:

[0057]

[0058] According to the above formula and corresponding to Figure 5 It can be seen that it is beneficial to generate square circuit waveforms and reduce the noise impact of odd waveforms.

[0059] Please refer to Figure 3In one embodiment, the third harmonic resonant circuit 151 includes an inductor L2 and a capacitor C2, one end of the inductor L2 is connected to the fundamental harmonic resonant circuit and the first end of the switch circuit, and the other end of the inductor L2 is connected to the ground via the capacitor C2. The inductor L2 and the capacitor C2 form a resonant circuit with low impedance to the third harmonic signal and high impedance to the fundamental signal, so that the third harmonic signal in the square wave signal is preferentially transmitted through the third harmonic resonant circuit 151. In this embodiment, the resonant frequency of the third harmonic resonant circuit 151 can be controlled by adjusting the parameters of the inductor L2 and the capacitor C2.

[0060] In one embodiment, Figure 3 On the basis of the embodiment shown, the odd harmonic resonant circuit 15 also includes a fifth high frequency odd resonant circuit, which is connected to the first end of the switch circuit to provide a transmission path for the fifth harmonic signal in the odd harmonic signal to avoid the fifth harmonic signal being superimposed on the fundamental signal. Specifically, the present embodiment also forms a fifth harmonic resonant circuit with low impedance to the fifth harmonic signal to avoid the fifth harmonic signal component being superimposed on the fundamental signal, thereby further improving the stability of the fundamental signal.

[0061] Of course, if the number of components and the volume of the equipment in the control circuit are not considered, in one embodiment, the odd harmonic resonant circuit 15 may include N high-frequency odd resonant circuits; wherein the N high-frequency odd resonant circuits include: 2M+1 subharmonic resonant circuit, 3M+1 subharmonic resonant circuit, ..., (N+1)*M+1 subharmonic resonant circuit, and each high-frequency odd resonant circuit is respectively connected to the first end of the switching circuit 11 to provide a corresponding transmission path for the relevant harmonic signal in the odd harmonic signal to avoid the high-frequency odd resonant signal from being superimposed on the basic signal, thereby obtaining the most ideal fundamental signal, which can maximize the stability of the fundamental signal; wherein, M=(1,2,3, ..., N), and N is a natural number. In this embodiment, the larger the value of N is, the greater the number of high-frequency odd-order resonant circuits included in the odd-order harmonic resonant circuit 15. For example, when N is 3, the N high-frequency odd-order resonant circuits include a third-order harmonic resonant circuit, a fifth-order harmonic resonant circuit and a seventh-order harmonic resonant circuit. It can be understood that the larger the value of N is, the higher the stability of the fundamental signal. As for the value of N, it can be considered based on factors such as product cost and volume, and is not limited here. It should be noted that the greater the number of high-frequency odd-order resonant circuits, the more conducive it is to constructing an ideal square wave signal, so the efficiency of the electromagnetic heating circuit is higher.

[0062] In addition, the third harmonic resonant circuit refers to a harmonic resonant circuit with low impedance to the third harmonic signal. Similarly, the fifth harmonic resonant circuit refers to a harmonic resonant circuit with low impedance to the fifth harmonic signal. The third harmonic signal refers to a harmonic signal with a frequency three times the fundamental signal frequency, and the fifth harmonic signal refers to a harmonic signal with a frequency five times the fundamental signal frequency. In addition, each high-frequency odd-order resonant circuit can be composed of an inductor and a capacitor, and its resonant frequency is achieved by adjusting the parameters of the inductor and the capacitor according to the needs, and is not limited here.

[0063] Please refer to Figure 3 In one embodiment, the switch circuit 11 includes an NMOS transistor, the first end of the switch circuit 11 corresponds to the drain of the NMOS transistor, the second end of the switch circuit 11 corresponds to the source of the NMOS transistor, and the control end of the switch circuit 11 corresponds to the gate of the NMOS transistor. Of course, the NMOS transistor can also be replaced by other types of switch transistors.

[0064] In one embodiment, the choke is an existing choke coil, which can generate very high impedance to high-frequency signals, thereby preventing the harmonic signal at the first end of the switch circuit 11 from flowing into or out of the choke coil.

[0065] It can be understood that the electromagnetic heating circuit of the present invention can operate at a higher operating frequency and has the advantages of low power loss, which can improve the heating efficiency of the electromagnetic heating circuit and help reduce the energy consumption and failure risk of the smoking device.

[0066] What is disclosed above is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. A person skilled in the art can understand that all or part of the processes of the above embodiments and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. An aerosol generating device, characterized in that: include: A power supply circuit, used for providing a DC power supply; A driving circuit, used for outputting a driving signal; The electromagnetic heating circuit is connected to the power supply circuit and the driving circuit, and generates a high-frequency alternating magnetic field according to the driving signal to stimulate the receptor in the high-frequency alternating magnetic field to generate heat.

2. The aerosol generating device according to claim 1, characterized in that: The electromagnetic heating circuit includes a fundamental wave resonant circuit, an odd wave resonant circuit, a choke, a switch circuit, and a coil; The choke is connected in series between the first end of the switch circuit and the power supply circuit to prevent the resonant signal from passing through, the second end of the switch circuit is grounded, and the control end of the switch circuit is connected to the drive signal, so that the switch circuit is alternately turned on and off according to the drive signal, so that the first end input to the switch circuit outputs a square wave signal; One end of the fundamental resonance circuit is connected to the ground via the odd-wave resonance circuit, and the other end of the fundamental resonance circuit is connected to the ground via the coil, and the connection point between the fundamental resonance circuit and the odd-wave resonance circuit is also connected to the first end of the switch circuit, so that when the switch circuit is alternately turned on and off, a fundamental signal and an odd-harmonic signal are respectively input to the first end of the switch circuit through the fundamental resonance circuit and the odd-wave resonance circuit, so that a square wave signal input to the first end of the switch circuit is constructed through the fundamental signal and the odd-harmonic signal, and the coil is powered by the fundamental signal flowing through the fundamental resonance circuit to excite the receptor to generate heat.

3. The aerosol generating device according to claim 2, characterized in that: The fundamental wave resonant circuit includes an inductor L1 and a capacitor C1, one end of the inductor L1 is connected to the odd harmonic resonant circuit and the first end of the switch circuit, and the other end of the inductor L1 is connected to the coil via the capacitor C1.

4. The aerosol generating device according to claim 2, characterized in that: The odd harmonic resonance circuit includes a third harmonic resonance circuit, and the third harmonic resonance circuit is connected to the first end of the switch circuit to provide a transmission path for the third harmonic signal in the odd harmonic signal.

5. The aerosol generating device according to claim 4, characterized in that: The third harmonic resonant circuit includes an inductor L2 and a capacitor C2, one end of the inductor L2 is connected to the fundamental harmonic resonant circuit and the first end of the switch circuit, and the other end of the inductor L2 is connected to the ground via the capacitor C2.

6. The aerosol generating device according to claim 4, characterized in that: The odd harmonic resonant circuit also includes a fifth high-frequency odd resonant circuit, which is connected to the first end of the switching circuit to provide a transmission path for the fifth harmonic signal in the odd harmonic signal to avoid the fifth harmonic signal being superimposed on the fundamental signal.

7. The aerosol generating device according to claim 2, characterized in that: The square wave signal input to the first end of the switch circuit is constructed by the fundamental wave signal and the odd harmonic signal, and the current calculation method is:

8. The aerosol generating device according to claim 7, characterized in that: The generated square wave signal utilizes even harmonics to achieve heating.

9. The aerosol generating device according to claim 7, characterized in that: Output current i D Between 0.5 amps and 5 amps.

10. The aerosol generating device according to claim 1, characterized in that The driving circuit includes an N-type transistor Q1 and a P-type transistor Q2; the input end of the N-type transistor Q1 is used to access a power supply, the output end of the N-type transistor Q1 is connected to the input end of the P-type transistor Q2, the output end of the P-type transistor Q2 is grounded, and the control ends of the N-type transistor Q1 and the P-type transistor Q2 are used to access an input signal with a fixed frequency, so that the N-type transistor Q1 and the P-type transistor Q2 are turned on or off based on the input signal, so as to output a driving signal with a fixed frequency through the output end of the N-type transistor Q1.

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