Aerosol generating device

Abstract

The utility model relates to an aerosol generating device which comprises a power supply circuit used for providing a direct-current power supply; 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, 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 emit heat, and the advantages that the even-order harmonic electromagnetic heating circuit after noise reduction can work at a high working frequency and is low in power loss are utilized. 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] This utility model relates to the field of electronic cigarette heating, and in particular to an aerosol generating device. Background Technology

[0002] In smoking devices that utilize the principle of electromagnetic heating, a sensor is first embedded in the aerosol generation matrix within the cartridge. Then, a coil surrounding the cartridge chamber couples with the sensor, and under the control of the circuit system, eddy current heating is achieved on the cartridge.

[0003] Some products on the market use the smoking device circuit described in patent CN110522092A. However, its problem lies in the fact that at higher operating frequencies, it cannot construct a relatively ideal voltage waveform. This imperfect voltage waveform leads to significant power loss in the switching circuit of the heating circuit. Furthermore, parasitic resistance inevitably exists in the inductors and capacitors of this inverter circuit, and the saturation voltage, saturation resistance, and fall time of the operating current in the switching circuit are not zero. These unfavorable factors further lead to power loss. In summary, this inverter circuit is unsuitable for high operating frequencies and suffers from high power loss, which can easily damage electronic components and cause smoking device malfunctions. Utility Model Content

[0004] The technical solution adopted by this utility model to solve its technical problem is: to construct an aerosol generating device, comprising:

[0005] Power supply circuit, used to provide DC power;

[0006] The driving circuit is used to output driving signals;

[0007] An electromagnetic heating circuit includes a fundamental resonant circuit, an odd harmonic resonant circuit, a choke, a switching circuit, and a coil. The choke is connected in series between the first terminal of the switching circuit and the power supply circuit to prevent the resonant signal from passing through. The second terminal of the switching circuit is grounded. The control terminal of the switching circuit is connected to the drive signal, causing the switching circuit to alternately turn on and off according to the drive signal, so that a square wave signal is output from the first terminal of the switching circuit. One end of the fundamental resonant circuit is connected to ground through the odd harmonic resonant circuit, and the other end of the fundamental resonant circuit is connected to ground through the coil. The connection point of the fundamental resonant circuit and the odd harmonic resonant circuit is also connected to the first terminal of the switching circuit. During the alternating on and off of the switching circuit, the fundamental resonant circuit and the odd harmonic resonant circuit respectively input the fundamental signal and the odd harmonic signal to the first terminal of the switching circuit, so as to construct a square wave signal input to the first terminal of the switching circuit through the fundamental signal and the odd harmonic signal. The fundamental signal flowing through the fundamental resonant circuit also supplies power to the coil to excite the sensor to heat up.

[0008] In one embodiment, the fundamental resonant circuit includes an inductor L1 and a capacitor C1. One end of the inductor L1 is connected to the first end of the odd harmonic resonant circuit and the switching circuit, and the other end of the inductor L1 is connected to the coil via the capacitor C1.

[0009] In one embodiment, the odd harmonic resonant circuit includes a third harmonic resonant circuit, which is connected to a first terminal of the switching circuit to provide a transmission path for the third harmonic signal in the odd harmonic signal.

[0010] In one embodiment, the fundamental resonant circuit includes an inductor L1 and a capacitor C1. One end of the inductor L1 is connected to the first end of the odd harmonic resonant circuit and the switching circuit, and the other end of the inductor L1 is connected to the coil via the capacitor C1.

[0011] In one embodiment, the odd harmonic resonant circuit includes a third harmonic resonant circuit, which is connected to a first terminal of the switching circuit to provide a transmission path for the third harmonic signal in the odd harmonic signal.

[0012] 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 first end of the fundamental harmonic resonant circuit and the switching circuit, and the other end of the inductor L2 is connected to ground via the capacitor C2.

[0013] In one embodiment, the odd harmonic resonant circuit further includes a fifth high-frequency odd resonant circuit, which is connected to the first terminal of the switching circuit to provide a transmission path for the fifth harmonic signal in the odd harmonic signal, thereby preventing the fifth harmonic signal from being superimposed on the fundamental signal.

[0014] In one embodiment, the switching circuit includes an NMOS transistor.

[0015] In one embodiment, the choke includes a choke coil.

[0016] In one embodiment, the current of the DC power supply is between 0.5 amps and 5 amps.

[0017] In one embodiment, the odd harmonic resonant circuit includes (2k+1) harmonic circuits.

[0018] In one embodiment, the driving circuit includes an N-type transistor Q1 and a P-type transistor Q2; the input terminal of the N-type transistor Q1 is connected to a power supply, the output terminal of the N-type transistor Q1 is connected to the input terminal of the P-type transistor Q2, the output terminal of the P-type transistor Q2 is grounded, and the control terminals of the N-type transistor Q1 and the P-type transistor Q2 are connected to a fixed-frequency input signal, 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 fixed-frequency driving signal through the output terminal of the N-type transistor Q1.

[0019] The technical solution of this utility model has the following beneficial effects:

[0020] This invention provides DC power through a power supply circuit, outputs a drive signal through a drive circuit, and generates a high-frequency alternating magnetic field through an electromagnetic heating circuit based on the drive signal to excite the sensor in the high-frequency alternating magnetic field to heat up. Utilizing the advantages of the electromagnetic heating circuit with even-order harmonics after noise reduction, which can operate at a higher frequency and has low power loss, the heating efficiency of the electromagnetic heating circuit can be improved, which helps to reduce the energy consumption and failure risk of the smoking device. Attached Figure Description

[0021] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a circuit structure block diagram of an aerosol generating device according to an embodiment of the present invention;

[0023] Figure 2 This is a circuit schematic diagram of a driving circuit according to an embodiment of the present invention;

[0024] Figure 3 This is a circuit diagram of an electromagnetic heating circuit according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of a harmonic component supplementation application circuit according to an embodiment of this utility model;

[0026] Figure 5 This is a waveform diagram of a square wave signal according to an embodiment of the present invention;

[0027] Figure 6 This is a waveform diagram of the driving signal, the change of input current at the first terminal of the switching circuit, the voltage change between the first and second terminals of the switching circuit, and the voltage change across the equivalent resistance of the coil during the heating process of the excitation sensor, according to an embodiment of this utility model.

[0028] Figure 7 This is a waveform diagram of the Fourier decomposition of a square wave signal according to an embodiment of this utility model. Detailed Implementation

[0029] To make the objectives, features, and advantages of this utility model more apparent and understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0030] Please refer to Figure 1 In one embodiment, an aerosol generating device is provided, which includes a power supply circuit 1, a drive circuit 2, and an electromagnetic heating circuit 3.

[0031] The power supply circuit 1 provides DC power to power the electromagnetic heating circuit 3. The power supply circuit 1 can be an existing DC power source, switching power supply, battery, or linear power source, as long as it can provide a stable DC power supply; there are no restrictions on this.

[0032] In one embodiment, the output voltage range of the DC power supply can be between 3 volts and 24 volts, and the output current range of the DC power supply can be between 0.5 amperes and 5 amperes.

[0033] Among them, the driving circuit 2 is used to output the driving signal.

[0034] Please refer to Figure 2In one embodiment, the driving circuit 2 includes an N-type transistor Q1 and a P-type transistor Q2. The input terminal of the N-type transistor Q1 is connected to the power supply VCC, the output terminal of the N-type transistor Q1 is connected to the input terminal of the P-type transistor Q2, the output terminal of the P-type transistor Q2 is grounded, and the control terminals of the N-type transistor Q1 and the P-type transistor Q2 are connected to a fixed-frequency input signal. This causes the N-type transistor Q1 and the P-type transistor Q2 to turn on or off based on the input signal, so that a fixed-frequency driving signal is output through the output terminal of the N-type transistor Q1. This causes the switching circuit 31 to alternately turn on and off at a fixed frequency, thereby forming a stable square wave signal at the first terminal of the switching circuit 31.

[0035] Please refer to Figure 2 In one embodiment, the driving circuit 2 may further include a resistor R1 and a capacitor C3. One end of the resistor R1 receives the input signal, and the other end is connected to the control terminals of both the N-type transistor Q1 and the P-type transistor Q2. The capacitor C3 is connected in parallel with the resistor R1, and the capacitor C3 and the resistor R1 form a coupling circuit, which can stably transmit the high-frequency input signal to the control terminals 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.

[0036] 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 drive signal, help to control the heat generation power of the sensor more stably, and play a positive role in improving the user experience.

[0037] Please refer to Figure 2 In one embodiment, the N-type transistor Q1 is an NPN transistor. The control terminal of the N-type transistor Q1 corresponds to the base of the NPN transistor, the input terminal of the N-type transistor Q1 corresponds to the collector of the NPN transistor, and the output terminal 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.

[0038] Please refer to Figure 2 In one embodiment, the P-type transistor Q2 is a PNP transistor. The control terminal of the P-type transistor Q2 corresponds to the base of the PNP transistor, the input terminal of the P-type transistor Q2 corresponds to the emitter of the PNP transistor, and the output terminal 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.

[0039] In one embodiment, the frequency range of the high-frequency alternating magnetic field is from 1 MHz to 40 MHz. Considering matching factors such as the shape and size of the 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.

[0040] The electromagnetic heating circuit 3 is connected to the power supply circuit 1 to obtain electrical energy; the electromagnetic heating circuit 3 is also connected to the driving circuit 2 to generate a high-frequency alternating magnetic field according to the driving signal, so as to excite the sensor in the high-frequency alternating magnetic field to heat up.

[0041] Please refer to Figure 3 In one embodiment, the electromagnetic heating circuit includes a switching circuit 31, a choke 32, a coil 33, a fundamental resonant circuit 34, and an odd harmonic resonant circuit 35. The choke 32 is connected in series between the first terminal of the switching circuit and the power supply circuit to prevent the resonant signal from passing through. The second terminal of the switching circuit is grounded. A drive signal is connected to the control terminal of the switching circuit, causing the switching circuit to alternately turn on and off according to the drive signal, so that a square wave signal is output from the first terminal of the switching circuit. One end of the fundamental resonant circuit is connected to ground via the odd harmonic resonant circuit, and the other end of the fundamental resonant circuit is connected to ground via the coil. The connection point between the fundamental resonant circuit and the odd harmonic resonant circuit is also connected to the first terminal of the switching circuit. During the alternating on and off process of the switching circuit, the fundamental signal and the odd harmonic signal are respectively input to the first terminal of the switching circuit through the fundamental resonant circuit and the odd harmonic resonant circuit, so as to construct a square wave signal input to the first terminal of the switching circuit through the fundamental signal and the odd harmonic signal. Furthermore, the fundamental signal flowing through the fundamental resonant circuit supplies power to the coil to excite the sensor to heat up.

[0042] refer to Figure 4 Based on the mathematical principle of decomposing periodic functions into a sum of simple oscillating functions using Fourier series expansion, this paper describes the Fourier decomposition of the RF circuit in the smoking device of this invention, thereby explaining the application logic of this invention and the selection idea for filtering harmonics.

[0043] Any periodic waveform can be decomposed into a DC component and higher harmonic components (including odd and even harmonics). Here, a square wave can be expanded into a fundamental wave of a specific frequency and higher harmonics such as 2k+1 (k = 1, 3, 5...) through a Fourier series.

[0044] Specifically, the Fourier series expansion formula is as follows: Where ω = 2π / T, is called the fundamental frequency, T is the period; a0 is a constant (often called the DC component); a n or b nLet n be the amplitude of the nth harmonic. The magnitude of the amplitude is determined by expression (1), which is expressed as:

[0045]

[0046] Assume the square wave signal input to the first terminal of the switching circuit 11 is as follows: Figure 4 As shown, the square wave signal can be represented 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 obtain that a0 = 0, a n =0, Furthermore, let a0 = 0, a n =0, Substituting into the Fourier series expansion formula, we get expression (3), which can be expressed as: As can be seen from expression (3), a square wave signal can be constructed from a fundamental wave signal and odd harmonic signals.

[0047] Please refer to Figure 5 V GS Indicates the voltage change of the drive signal; i D This represents the change in current input to the first terminal of the switching circuit 11; V DS This represents the voltage change between the first and second terminals of the switching circuit 11; V RL This represents the voltage change across the equivalent resistance of coil 13 during the heating process of the excitation sensor, i.e., the fundamental signal.

[0048] Please refer to Figure 3 and Figure 5 In an ideal circuit model, when V GS When the voltage level is high, the switching circuit 11 is turned on. The impedance between the first and second terminals of the switching circuit 11 is low due to the connection, causing the DC power supply VI to flow to ground through the choke 12 and the switching circuit 11. This results in a large current i input to the first terminal of the switching circuit 11. D The current i surges, and because the on-resistance of the switching circuit 11 is small and stable, the current i increases during the conduction process of the switching circuit 11. D Keep it at a certain constant value i DM , and V DS Then it is 0V, when V GS When the voltage level is low, the switch circuit 11 is turned off, and the impedance between the first and second terminals of the switch circuit 11 is high, causing the current i flowing into the first terminal of the switch circuit 11 to be low. D The current drops to 0A, so the current signals at the first and second terminals of the switching circuit 11 will be square waves.

[0049] Furthermore, when the switching circuit 11 is turned off, the DC power supply VI begins to be input to the fundamental resonant circuit 14 and the odd harmonic resonant circuit 15 via the choke 12, causing the fundamental resonant circuit 14 and the odd harmonic resonant circuit 15 to resonate, thus making V DS It is in the form of a half-sine wave. When the next conduction cycle of the switching circuit 11 arrives, the impedance between the first and second terminals of the switching circuit 11 is in a low-resistance state. The harmonic signals flowing through the fundamental resonant circuit 14 and the odd harmonic resonant circuit 15 will be superimposed at the first terminal of the switching circuit 11. Because the choke 12 generates a high impedance to high-frequency signals, it will prevent high-frequency resonant signals (such as the fundamental signal and odd harmonic signals) from flowing into the power supply circuit and the high-frequency resonant signals output by the power supply circuit from flowing into the first terminal of the switching circuit 11. As a result, the harmonic signals flowing through the fundamental resonant circuit 14 and the odd harmonic resonant circuit 15 can only flow into the ground through the first and second terminals of the switching circuit 11.

[0050] Since the square wave signal at the first terminal of the switching circuit 11 can be composed of the fundamental wave signal and odd harmonic signals, and the current at the first terminal of the switching circuit 11 is square wave shaped, as long as the fundamental resonant circuit 14 is configured to produce a high impedance to high-frequency resonant signals (such as odd harmonic signals of the third order and above) and a very low impedance to the fundamental wave signal, the current flowing through the fundamental resonant circuit 14 is the fundamental wave signal. The waveform of the fundamental wave signal can be referenced as follows: Figure 5 V in RL The waveform diagram shows that the first terminal of the switching circuit 11 can not only obtain the fundamental wave signal constituting the square wave signal from the fundamental resonant circuit 14, but also the fundamental wave signal flows through the coil 13 while flowing through the fundamental resonant circuit 14, supplying power to the coil. Then, the odd harmonic resonant circuit 15 is set to generate a very low impedance to the high-frequency resonant signal and a very high impedance to the fundamental wave signal. In this way, the odd harmonic signal constituting the square wave signal can be obtained from the odd harmonic resonant circuit 15. Under the action of the odd harmonic resonant circuit 15, the odd harmonic signal will preferentially be transmitted through the odd harmonic resonant circuit 15 and will not flow into the fundamental resonant circuit 14. This can avoid superimposing high-frequency harmonics on the power supply signal to the coil 13, so that the fundamental wave signal remains a standard sine wave. Understandably, in this embodiment, by controlling the switching circuit 11 to alternately turn on and off, the current input to the first terminal of the switching circuit 11 is kept as a square wave signal. At the same time, with the cooperation of the choke 12, the fundamental resonant circuit 14 and the odd harmonic resonant circuit 15, the current flowing through the fundamental resonant circuit 14 and supplying power to the coil 13 is kept as a fundamental signal, thus achieving the effect of driving the coil 13 with the fundamental signal. Since the fundamental signal does not have harmonics of other frequencies superimposed, it has the advantages of low noise and stable waveform, which facilitates temperature regulation control (such as PID control) and reduces interference in the circuit. This helps the circuit system to achieve accurate heating, temperature measurement and temperature control.

[0051] In one embodiment, the choke 12 may include a choke coil, which has high impedance to high-frequency harmonics. Figure 3 In the embodiment, the choke coil acts as a biasing element, which can isolate the influence of high-frequency harmonics on the DC bias, thereby preventing the harmonics output by the fundamental resonant circuit 14 and the odd harmonic resonant circuit 15 from flowing through the choke coil.

[0052] Please refer to Figure 3 In one embodiment, the fundamental resonant circuit 14 includes an inductor L1 and a capacitor C1. One end of the inductor L1 is connected to the first terminal of the odd harmonic resonant circuit 15 and the switching 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 constitute a resonant circuit with high impedance to high-frequency resonant signals and low impedance to the fundamental signal, enabling the resonant circuit to provide a stable fundamental signal to the coil 13. In this embodiment, the resonant frequency of the fundamental resonant circuit 14 can be controlled by adjusting the parameters of the inductor L1 and the capacitor C1.

[0053] Please refer to Figure 3 In one embodiment, the odd-order harmonic resonant circuit 15 includes a third-order harmonic resonant circuit 151, which is connected to the first terminal of the switching circuit to provide a transmission path for the third-order harmonic signal in the odd-order harmonic signal, thus preventing the third-order harmonic signal from being superimposed on the fundamental signal. Specifically, as can be seen from expression (3), the amplitude of the odd-order harmonic signal is determined by... Therefore, the higher the order of the odd harmonic signal (i.e., the larger n is), the smaller the amplitude of the odd harmonic signal, and this can be referenced. Figure 6 It is known that the influence of odd harmonic signals on square wave signals decreases as the amplitude of odd harmonic signals decreases. Although the most ideal square wave signal can be synthesized by superimposing the fundamental signal with multiple odd harmonic signals without limitation, considering the number of components and the size of the control circuit, this embodiment only considers building a third harmonic resonant circuit 151 to limit the third harmonic signal, which has the greatest influence among the odd harmonic signals, 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 thus powering the coil 13 with a more stable and less noisy fundamental signal.

[0054] Because multiple (2k+1) odd harmonic cancellation circuits were constructed, the calculation method for the current square wave to generate heating using only even harmonic components is as follows:

[0055]

[0056] According to the above formula and corresponding to Figure 5 It is evident that this is beneficial for generating square circuit waveforms and reducing the noise impact of odd-order waveforms.

[0057] Please refer to Figure 3 In 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 first terminal of the fundamental harmonic resonant circuit and the switching circuit, and the other end of the inductor L2 is connected to ground via the capacitor C2. The inductor L2 and the capacitor C2 constitute 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.

[0058] In one embodiment, in Figure 3 Based on the illustrated embodiment, the odd harmonic resonant circuit 15 further includes a fifth-order high-frequency odd-order resonant circuit. This fifth-order high-frequency odd-order resonant circuit is connected to the first terminal of the switching circuit to provide a transmission path for the fifth-order harmonic signal within the odd harmonic signal, preventing the fifth-order harmonic signal from being superimposed on the fundamental signal. Specifically, this embodiment also constructs a fifth-order harmonic resonant circuit with low impedance to the fifth-order harmonic signal, further preventing the fifth-order harmonic signal component from being superimposed on the fundamental signal and improving the stability of the fundamental signal.

[0059] Of course, if the number of components and the size of the device in the control circuit are not considered, in one embodiment, the odd harmonic resonant circuit 15 may include N high-frequency odd harmonic resonant circuits; wherein the N high-frequency odd harmonic resonant circuits include: 2M+1 harmonic resonant circuit, 3M+1 harmonic resonant circuit, ..., (N+1)*M+1 harmonic resonant circuit, each high-frequency odd harmonic resonant circuit is connected to the first terminal of the switching circuit 11 to provide a corresponding transmission path for the related harmonic signals in the odd harmonic signal, so as to avoid the high-frequency odd harmonic resonant signal being superimposed on the fundamental 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, the more high-frequency odd-order resonant circuits are included in the odd-order harmonic resonant circuit 15. For example, when N is 3, the N high-frequency odd-order resonant circuits include the third harmonic resonant circuit, the fifth harmonic resonant circuit, and the seventh harmonic resonant circuit. It can be understood that the larger N is, the higher the stability of the fundamental wave signal. The value of N can be determined based on factors such as product cost and volume, and is not limited here. It should be noted that the more high-frequency odd-order resonant circuits there are, the more conducive it is to constructing an ideal square wave signal, and the higher the efficiency of the electromagnetic heating circuit.

[0060] Furthermore, a third harmonic resonant circuit refers to a harmonic resonant circuit with low impedance to the third resonant signal. Similarly, a fifth harmonic resonant circuit refers to a harmonic resonant circuit with low impedance to the fifth resonant signal. The third harmonic signal is a harmonic signal with a frequency three times that of the fundamental signal, while the fifth harmonic signal is a harmonic signal with a frequency five times that of the fundamental signal. Additionally, all high-frequency odd-order resonant circuits can be composed of inductors and capacitors, and their resonant frequencies can be achieved by adjusting the parameters of the inductors and capacitors as needed; no restrictions are placed here.

[0061] Please refer to Figure 3 In one embodiment, the switching circuit 11 includes an NMOS transistor. The first terminal of the switching circuit 11 corresponds to the drain of the NMOS transistor, the second terminal of the switching circuit 11 corresponds to the source of the NMOS transistor, and the control terminal of the switching circuit 11 corresponds to the gate of the NMOS transistor. Of course, other types of switching transistors can also be used instead of the NMOS transistor.

[0062] In one embodiment, the choke is an existing choke coil, which can generate a high impedance to high-frequency signals, thereby preventing harmonic signals at the first terminal of the switching circuit 11 from flowing in or out through the choke coil.

[0063] Understandably, the electromagnetic heating circuit of this invention has the advantages of operating at a higher frequency and having 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.

[0064] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Those skilled in the art can understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present utility model are still within the scope of the utility model.

Claims

1. An aerosol generating device, characterized in that, include: Power supply circuit, used to provide DC power; The driving circuit is used to output driving signals; An electromagnetic heating circuit includes a fundamental resonant circuit, an odd harmonic resonant circuit, a choke, a switching circuit, and a coil. The choke is connected in series between the first terminal of the switching circuit and the power supply circuit to prevent the resonant signal from passing through. The second terminal of the switching circuit is grounded. The control terminal of the switching circuit is connected to the drive signal, causing the switching circuit to alternately turn on and off according to the drive signal, so that a square wave signal is output from the first terminal of the switching circuit. One end of the fundamental resonant circuit is connected to ground through the odd harmonic resonant circuit, and the other end of the fundamental resonant circuit is connected to ground through the coil. The connection point between the fundamental resonant circuit and the odd harmonic resonant circuit is also connected to the first terminal of the switching circuit. During the alternating on and off of the switching circuit, the fundamental resonant circuit and the odd harmonic resonant circuit respectively input the fundamental signal and the odd harmonic signal to the first terminal of the switching circuit, so as to construct a square wave signal input to the first terminal of the switching circuit through the fundamental signal and the odd harmonic resonant circuit, and also to supply power to the coil through the fundamental signal flowing through the fundamental resonant circuit.

2. The aerosol generating apparatus according to claim 1, characterized in that, The fundamental resonant circuit includes an inductor L1 and a capacitor C1. One end of the inductor L1 is connected to the first end of the odd harmonic resonant circuit and the switching circuit, and the other end of the inductor L1 is connected to the coil via the capacitor C1.

3. The aerosol generating apparatus according to claim 1, characterized in that, The odd harmonic resonant circuit includes a third harmonic resonant circuit, which is connected to the first terminal of the switching circuit to provide a transmission path for the third harmonic signal in the odd harmonic signal.

4. The aerosol generating apparatus according to claim 3, 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 first end of the fundamental harmonic resonant circuit and the switching circuit, and the other end of the inductor L2 is connected to ground via the capacitor C2.

5. The aerosol generating apparatus according to claim 1, characterized in that, The odd harmonic resonant circuit further includes a fifth high-frequency odd resonant circuit, which is connected to the first terminal of the switching circuit to provide a transmission path for the fifth harmonic signal in the odd harmonic signal, thereby preventing the fifth harmonic signal from being superimposed on the fundamental signal.

6. The aerosol generating apparatus according to claim 1, characterized in that, The DC power supply has a current between 0.5 amps and 5 amps.

7. The aerosol generating apparatus according to claim 1, characterized in that, The driving circuit includes an N-type transistor Q1 and a P-type transistor Q2. The input terminal of the N-type transistor Q1 is connected to a power supply, the output terminal of the N-type transistor Q1 is connected to the input terminal of the P-type transistor Q2, the output terminal of the P-type transistor Q2 is grounded, and the control terminals of the N-type transistor Q1 and the P-type transistor Q2 are connected to a fixed-frequency input signal, 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 fixed-frequency driving signal through the output terminal of the N-type transistor Q1.

8. The aerosol generating apparatus according to claim 7, characterized in that, The odd harmonic resonant circuit includes (2k+1) harmonic circuits.

9. The aerosol generating apparatus according to claim 1, characterized in that, The switching circuit includes an NMOS transistor.

10. The aerosol generating apparatus according to claim 1, characterized in that, The choke includes a choke coil.

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