Heating circuit and heating non-combustion device

Abstract

The utility model belongs to the technical field of heat-not-burn, and provides a heating circuit and a heat-not-burn device. The heating circuit comprises a resonance module, a driving module and a first switch module, the resonance module is connected with the power supply and the first end of the heating body, the first switch module is connected with the driving module, the resonance module and the second end of the heating body, and the first switch module is further used for being grounded; the driving module is used for outputting a driving signal with a preset frequency; when the preset frequency is equal to the resonant frequency of the resonance module and the first switch module is switched on according to the driving signal, the resonance module is used for outputting a target voltage to the heating body to heat the heating body; wherein the target voltage is Q times of the voltage of the power supply, Q is the quality factor of the heating circuit, and Q is greater than square root of 2. According to the heating circuit provided by the invention, the resonance phenomenon and the parallel connection of the heating body are ingeniously utilized, so that the output power of the heating body is effectively improved, and meanwhile, the design simplicity of the heating circuit is kept.

Description

Technical Field

[0001] The present application belongs to the field of heat-without-combustion technology, and in particular relates to a heating circuit and a heat-without-combustion device. Background Art

[0002] The working principle of the current heat-not-burn device is mainly to heat the resistor-type heating element, and then use the heat of the resistor-type heating element to atomize the tobacco oil into smoke for the user to inhale. In order to increase the atomization speed of the tobacco oil, the output power of the resistor-type heating element is usually increased. At present, the common means to increase the output power of the resistor-type heating element is to add a boost circuit to the heating circuit, increase the driving voltage of the resistor-type heating element through the boost circuit, and then increase the output power of the resistor-type heating element. However, the structure of the boost circuit is relatively complex, which increases the difficulty of designing the heating circuit. Utility Model Content

[0003] The embodiments of the present application provide a heating circuit and a heating-without-combustion device, which can solve the problem that the design of the heating circuit is difficult due to the complex structure of the boost circuit.

[0004] In a first aspect, an embodiment of the present application provides a heating circuit, comprising a resonance module, a drive module, and a first switch module, wherein the resonance module is connected to a power supply and a first end of a heating element, respectively; the first switch module is connected to the drive module, the resonance module, and a second end of the heating element, respectively; and the first switch module is further configured to be grounded;

[0005] The driving module is used to output a driving signal of a preset frequency; when the preset frequency is equal to the resonant frequency of the resonant module and the first switching module is turned on according to the driving signal, the resonant module is used to output a target voltage to the heating element to heat the heating element; wherein the target voltage is Q times the voltage of the power supply, Q is the quality factor of the heating circuit, and Q is greater than √2.

[0006] In a possible implementation of the first aspect, the resonance module includes a first capacitor and a first inductor, the first end of the first capacitor is respectively connected to the first end of the first inductor, the first end of the heating element and the power supply, and the second end of the first capacitor is respectively connected to the second end of the first inductor, the second end of the heating element and the first switch module.

[0007] In a possible implementation of the first aspect, the driving module includes a signal generating unit and a driving unit, and the driving unit is connected to the signal generating unit and the first switch module respectively;

[0008] The signal generating unit is used to output a first signal of a preset frequency; and the driving unit is used to output a driving signal of a preset frequency according to the first signal of the preset frequency.

[0009] In a possible implementation manner of the first aspect, the signal generating unit includes a signal generating chip, and an output end of the signal generating chip is connected to the driving unit.

[0010] In a possible implementation of the first aspect, the driving unit includes a driving chip, an input end of the driving chip is connected to the signal generating unit, and an output end of the driving chip is connected to the first switch module.

[0011] In a possible implementation of the first aspect, the first switching module includes a first switching tube, a gate of the first switching tube is connected to the driving module, a drain of the first switching tube is respectively connected to the resonance module and the second end of the heating element, and a source of the first switching tube is used for grounding.

[0012] In a possible implementation of the first aspect, the heating circuit further includes a filter module, and the filter module is connected to the resonance module and the power supply respectively;

[0013] The filtering module is used to filter the voltage of the power supply.

[0014] In a possible implementation of the first aspect, the filtering module includes a second capacitor and a second inductor, the first end of the second capacitor is respectively connected to the first end of the second inductor and the resonance module, the second end of the second capacitor is grounded, and the second end of the second inductor is used to be connected to the power supply.

[0015] In a possible implementation of the first aspect, the heating circuit further includes a second switch module, which is connected to the filter module and the power supply respectively;

[0016] When the second switch module is turned on, the heating circuit starts to work; when the second switch module is turned off, the heating circuit stops working.

[0017] In a second aspect, an embodiment of the present application provides a heat-without-combustion device, comprising the heating circuit described in any one of the first aspects.

[0018] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0019] An embodiment of the present application provides a heating circuit, including a resonance module, a driving module and a first switch module. The resonance module is respectively connected to a power supply and a first end of a heating element. The first switch module is respectively connected to the driving module, the resonance module and a second end of the heating element. The first switch module is also used for grounding.

[0020] The driving module is used to output a driving signal of a preset frequency. When the preset frequency is equal to the resonant frequency of the resonance module and the first switch module is turned on according to the driving signal, the resonance module is used to output a target voltage (i.e., a driving voltage) to the heating element to heat the heating element. The target voltage is Q times the voltage of the power supply, where Q is the quality factor of the heating circuit, and Q is greater than

[0021] In this application, the heating element is connected in parallel at both ends of the resonant module to reduce the total impedance of the heating circuit. Since the quality factor Q of the heating circuit is inversely proportional to the total impedance of the heating circuit, when the total impedance of the heating circuit is reduced, the quality factor Q of the heating circuit will increase. At the same time, it is necessary to ensure that Q is greater than The specific principle is: when the preset frequency of the driving signal is equal to the resonant frequency of the resonant module, the voltage on the resonant module reaches the peak voltage (i.e., the target voltage), and the peak voltage is Q times the voltage of the power supply. Since the waveform generated on the resonant module is a sine wave, the effective value of the voltage applied to the heating element is the peak voltage. times, in order to ensure that the effective value of the voltage applied to the heating element is greater than the voltage of the power supply, it is necessary to ensure that Q is greater than In this way, the driving voltage of the heating element can be increased, thereby increasing the output power of the heating element. The resonance module in this application is simple and easy to implement, which not only increases the output power of the heating element, but also reduces the difficulty of designing the heating circuit.

[0022] In summary, the heating circuit provided in the present application achieves an effective improvement in the output power of the heating element by cleverly utilizing the resonance phenomenon and the parallel connection of the heating element, while maintaining the simplicity of the heating circuit design.

[0023] It can be understood that the beneficial effects of the second aspect mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0025] Figure 1This is a principle block diagram of a heating circuit provided by prior art 1;

[0026] Figure 2 This is a principle block diagram of the heating circuit provided by the second prior art;

[0027] Figure 3 This is a principle block diagram of a heating circuit provided in one embodiment of the present application;

[0028] Figure 4 is a principle block diagram of a heating circuit provided in another embodiment of the present application;

[0029] Figure 5 is a principle block diagram of a heating circuit provided in another embodiment of the present application;

[0030] Figure 6 is a principle block diagram of a heating circuit provided in another embodiment of the present application;

[0031] Figure 7 This is a circuit connection diagram of a heating circuit provided in one embodiment of the present application;

[0032] Figure 8 This is a circuit connection diagram of a heating circuit provided in another embodiment of the present application.

[0033] In the figure: 10, heating circuit; 11, resonance module; 12, driving module; 121, signal generating unit; 1211, signal generating chip; 122, driving unit; 1221, driving chip; 13, first switch module; 14, filtering module; 15, second switch module; 20, heating element; 30, power supply. DETAILED DESCRIPTION

[0034] In the following description, specific details such as specific system structures and techniques are provided for purposes of illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obscuring the description of the present application with unnecessary detail.

[0035] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections thereof.

[0036] As used in this specification and the appended claims, the term "if" can be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0037] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0038] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0039] The heating circuit provided by the prior art is as follows Figure 1 As shown, its working principle is: the power supply switch circuit is controlled to be turned on, so that the heating circuit starts to work. The drive circuit outputs a drive signal to the switch circuit. When the switch circuit is turned on according to the drive signal, the battery provides a drive voltage to the resistance type heater, and the drive voltage is equal to the battery voltage. The maximum output power of the resistance type heater is the square of the battery voltage divided by the resistance value of the resistance type heater. As can be seen from the above, the existing technology cannot increase the output power of the resistance type heater.

[0040] In order to increase the output power of the resistance type heating element, the commonly used method is to Figure 1 The Boost boost circuit is added on the basis of the heating circuit. The principle block diagram of the heating circuit after adding the Boost boost circuit is as follows Figure 2As shown, its working principle is: control the power supply switch circuit to be turned on, so that the heating circuit starts to work. The driving circuit outputs a first driving signal to the Boost boost circuit and outputs a second driving signal to the switching circuit. The Boost boost circuit boosts the battery voltage according to the first driving signal to obtain a first voltage. When the switching circuit is turned on according to the second driving signal, the Boost boost circuit outputs the first voltage to the resistive type heating element to increase the output power of the resistive type heating element. However, due to the complex structure of the boost circuit, the design of the heating circuit is more difficult.

[0041] In view of the above problems, the present invention provides a heating circuit. Figure 3 As shown, the heating circuit 10 includes a resonance module 11, a driving module 12 and a first switch module 13. The resonance module 11 is respectively connected to the power supply 30 and the first end of the heating element 20. The first switch module 13 is respectively connected to the second end of the driving module 12, the resonance module 11 and the heating element 20. The first switch module 13 is also used for grounding.

[0042] Specifically, the driving module 12 is used to output a driving signal of a preset frequency, wherein the preset frequency is f, and the value of f is relatively large to ensure that the driving signal is a high-frequency signal. When the first switch module 13 is turned on according to the driving signal, the resonance module 11 is charged according to the voltage of the power supply 30, and the heating element 20 is also heated according to the voltage of the power supply 30. When the first switch module 13 is disconnected according to the driving signal, the resonance module 11 discharges to the heating element 20. When the preset frequency is equal to the resonant frequency of the resonance module 11, and the first switch module 13 is turned on according to the driving signal, the resonance module 11 is used to output a target voltage (that is, a driving voltage) to the heating element 20 to heat the heating element 20. Among them, the target voltage is Q times the voltage of the power supply 30, Q is the quality factor of the heating circuit 10, and Q is greater than Q represents the energy loss of the circuit. The higher the Q, the lower the energy loss of the circuit at resonance and the higher the efficiency.

[0043] In this application, the heating element 20 is connected in parallel at both ends of the resonant module 11, which can reduce the total impedance of the heating circuit 10. Since the quality factor Q of the heating circuit 10 is inversely proportional to the total impedance of the heating circuit 10, when the total impedance of the heating circuit 10 is reduced, the quality factor Q of the heating circuit 10 will increase. At the same time, it is necessary to ensure that Q is greater than The specific principle is: when the preset frequency of the driving signal is equal to the resonant frequency of the resonant module 11, the voltage on the resonant module 11 reaches the peak voltage (i.e., the target voltage), and the peak voltage is Q times the voltage of the power supply 30. Since the waveform generated on the resonant module 11 is a sine wave, the effective value of the voltage applied to the heating element 20 is the peak voltage. times, in order to ensure that the effective value of the voltage applied to the heating element 20 is greater than the voltage of the power supply 30, it is necessary to ensure that Q is greater than In this way, the driving voltage of the heating element 20 can be increased, thereby increasing the output power of the heating element 20. The resonance module 11 in this application is simple and easy to implement, which not only increases the output power of the heating element 20 but also reduces the design difficulty of the heating circuit 10.

[0044] In summary, the heating circuit 10 provided in the present application achieves an effective improvement in the output power of the heating element 20 by cleverly utilizing the resonance phenomenon and the parallel connection of the heating element 20, while maintaining the simplicity of the design of the heating circuit 10.

[0045] It should be noted that the heating element 20 includes thermocouples, negative temperature coefficient thermistors, positive temperature coefficient thermistors and platinum resistors, etc. Technical personnel in this field can select a suitable heating element 20 according to the requirements of the actual application scenario. The specific type of the heating element 20 is not limited here.

[0046] It should be noted that the power supply 30 includes a battery. Those skilled in the art can select a suitable battery according to the requirements of the actual application scenario, and the specific type of battery is not limited here.

[0047] In some embodiments, as Figure 7 As shown, the resonance module 11 includes a first capacitor C1 and a first inductor L1, the first end of the first capacitor C1 is respectively connected to the first end of the first inductor L1, the first end of the heating element 20 and the power supply 30, and the second end of the first capacitor C1 is respectively connected to the second end of the first inductor L1, the second end of the heating element 20 and the first switch module 13.

[0048] Specifically, the driving module 12 is used to output a driving signal of a preset frequency, wherein the preset frequency is f, and the value of f is relatively large to ensure that the driving signal is a high-frequency signal. When the first switch module 13 is turned on according to the driving signal, the first capacitor C1 and the first inductor L1 are charged according to the voltage of the power supply 30, and the heating element 20 is also heated according to the voltage of the power supply 30. When the first switch module 13 is disconnected according to the driving signal, the first capacitor C1 and the first inductor L1 are discharged to the heating element 20 at the same time, and energy conversion is performed between the first capacitor C1 and the first inductor L1 to form resonance. When the preset frequency is equal to the resonant frequency of the resonance module 11, and the first switch module 13 is turned on according to the driving signal, the voltage on the first capacitor C1 and the first inductor L1 reaches the peak voltage, that is, the target voltage, to heat the heating element 20. It should be noted that the resonant frequency f0 of the resonance module 11 is equal to Where L is the inductance of the first inductor L1, and C is the capacitance of the first capacitor C1. As can be seen from the above, if the preset frequency f is equal to the resonant frequency f0, the value of the preset frequency f can be determined by the inductance of the first inductor L1 and the capacitance of the first capacitor C1. The quality factor Q is also determined by the inductance of the first inductor L1 and the capacitance of the first capacitor C1. Therefore, the selection of the inductance of the first inductor L1 and the capacitance of the first capacitor C1 should ensure that the quality factor Q is greater than

[0049] In some embodiments, as Figure 4 As shown, the driving module 12 includes a signal generating unit 121 and a driving unit 122 , and the driving unit 122 is connected to the signal generating unit 121 and the first switch module 13 respectively.

[0050] Specifically, the signal generating unit 121 is configured to output a first signal of a preset frequency, wherein the first signal is a PWM (Pulse Width Modulation) signal. The driving unit 122 is configured to output a driving signal of a preset frequency based on the first signal of the preset frequency. The driving unit 122 is primarily configured to amplify the first signal to increase its driving capability, thereby meeting the driving requirements of the first switching module 13.

[0051] In some embodiments, as Figure 7 As shown, the signal generating unit 121 includes a signal generating chip 1211 , and an output end of the signal generating chip 1211 is connected to the driving unit 122 .

[0052] Specifically, the signal generating chip 1211 is used to output a first signal of a preset frequency, wherein the first signal is a PWM signal. Exemplarily, the signal generating chip 1211 is a single chip microcomputer.

[0053] In some embodiments, as Figure 7 As shown, the driving unit 122 includes a driving chip 1221 , an input end of the driving chip 1221 is connected to the signal generating unit 121 , and an output end of the driving chip 1221 is connected to the first switch module 13 .

[0054] Specifically, the driver chip 1221 is used to amplify the first signal to obtain a driving signal. The driver chip 1221 is used to improve the driving capability of the first signal, thereby meeting the driving requirements of the first switch module 13. It should be noted that this application does not limit the model of the driver chip 1221.

[0055] Exemplarily, the driving unit 122 may also be an inverter or a voltage follower composed of an operational amplifier.

[0056] In some embodiments, as Figure 7As shown, the first switch module 13 includes a first switch tube K1, the gate of the first switch tube K1 is connected to the driving module 12, the drain of the first switch tube K1 is respectively connected to the second end of the resonance module 11 and the heating element 20, and the source of the first switch tube K1 is used for grounding.

[0057] Specifically, the signal generating chip 1211 is used to output a first signal of a preset frequency, wherein the first signal is a PWM signal, the preset frequency is f, and the value of f is large to ensure that the driving signal is a high-frequency signal. The driving chip 1221 is used to amplify the first signal to obtain a driving signal. When the first switch tube K1 is turned on according to the driving signal, the first capacitor C1 and the first inductor L1 are charged according to the voltage of the power supply 30, and the heating element 20 is also heated according to the voltage of the power supply 30. When the first switch tube K1 is turned off according to the driving signal, the first capacitor C1 and the first inductor L1 are discharged to the heating element 20 at the same time, and energy conversion is performed between the first capacitor C1 and the first inductor L1 to form resonance. When the preset frequency is equal to the resonant frequency of the resonance module 11, and the first switch module 13 is turned on according to the driving signal, the voltage on the first capacitor C1 and the first inductor L1 reaches the peak voltage, that is, the target voltage, to heat the heating element 20.

[0058] Exemplarily, the first switch tube K1 includes a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) or an IGBT (Insulate-Gate Bipolar Transistor).

[0059] In some embodiments, as Figure 5 As shown, the heating circuit 10 further includes a filter module 14, which is connected to the resonance module 11 and the power supply 30. Specifically, the filter module 14 is used to filter the voltage of the power supply 30 and prevent the resonance module 11 from interfering with the power supply 30 when discharging.

[0060] In some embodiments, as Figure 8 As shown, the filtering module 14 includes a second capacitor C2 and a second inductor L2, the first end of the second capacitor C2 is respectively connected to the first end of the second inductor L2 and the resonance module 11, the second end of the second capacitor C2 is grounded, and the second end of the second inductor L2 is used to connect to the power supply 30.

[0061] Specifically, the signal generating chip 1211 is used to output a first signal of a preset frequency, wherein the first signal is a PWM signal, the preset frequency is f, and the value of f is large to ensure that the driving signal is a high-frequency signal. The driving chip 1221 is used to amplify the first signal to obtain a driving signal. When the first switch tube K1 is turned on according to the driving signal, the second inductor L2 and the second capacitor C2 filter the voltage of the power supply 30, and the first capacitor C1 and the first inductor L1 are charged according to the filtered voltage of the power supply 30. At the same time, the heating element 20 is also heated according to the filtered voltage of the power supply 30. When the first switch tube K1 is turned off according to the driving signal, the first capacitor C1 and the first inductor L1 discharge to the heating element 20 at the same time, and energy conversion is performed between the first capacitor C1 and the first inductor L1 to form resonance. When the first capacitor C1 and the first inductor L1 are discharged outward, the second inductor L2 and the second capacitor C2 are also used to filter to prevent interference with the power supply 30. When the preset frequency is equal to the resonant frequency of the resonant module 11 and the first switch module 13 is turned on according to the driving signal, the voltages on the first capacitor C1 and the first inductor L1 reach a peak voltage, ie, a target voltage, to heat the heating element 20 .

[0062] In some embodiments, as Figure 6 As shown, the heating circuit 10 further includes a second switch module 15 , which is connected to the filter module 14 and the power supply 30 respectively.

[0063] Specifically, the second switch module 15 is used to control the working state of the heating circuit 10. When the second switch module 15 is turned on, the heating circuit 10 starts to work; when the second switch module 15 is turned off, the heating circuit 10 stops working.

[0064] In some embodiments, as Figure 8 As shown, the second switch module 15 includes a second switch K2 , a first end of the second switch K2 is used to be connected to the power supply 30 , and a second end of the second switch K2 is connected to the filter module 14 .

[0065] Specifically, the second switch K2 is used to control the working state of the heating circuit 10. When the second switch K2 is turned on, the heating circuit 10 starts to work; when the second switch K2 is turned off, the heating circuit 10 stops working.

[0066] Exemplarily, the second switch K2 includes an electronic switch and a mechanical switch. Those skilled in the art may select a suitable second switch K2 according to the requirements of actual application scenarios, and the specific type of the second switch K2 is not limited herein.

[0067] In summary, the heating circuit 10 provided in the embodiment of the present application connects the heating element 20 in parallel at both ends of the resonant module 11, which can reduce the total impedance of the heating circuit 10. Since the quality factor Q of the heating circuit 10 is inversely proportional to the total impedance of the heating circuit 10, when the total impedance of the heating circuit 10 is reduced, the quality factor Q of the heating circuit 10 will increase. At the same time, it is necessary to ensure that Q is greater than The specific principle is: when the preset frequency of the driving signal is equal to the resonant frequency of the resonant module 11, the voltage on the resonant module 11 reaches the peak voltage (i.e., the target voltage), and the peak voltage is Q times the voltage of the power supply 30. Since the waveform generated on the resonant module 11 is a sine wave, the effective value of the voltage applied to the heating element 20 is the peak voltage. times, in order to ensure that the effective value of the voltage applied to the heating element 20 is greater than the voltage of the power supply 30, it is necessary to ensure that Q is greater than In this way, the driving voltage of the heating element 20 can be increased, thereby increasing the output power of the heating element 20. The resonance module 11 in this application is simple and easy to implement, which not only increases the output power of the heating element 20 but also reduces the design difficulty of the heating circuit 10.

[0068] The heating circuit 10 provided in the present application achieves an effective increase in the output power of the heating element 20 by cleverly utilizing the resonance phenomenon and the parallel connection of the heating element 20, while maintaining the simplicity of the design of the heating circuit 10.

[0069] The present application also provides a heat-without-combustion device comprising the aforementioned heating circuit. Because the heat-without-combustion device provided by the present application includes the aforementioned heating circuit, the heat-without-combustion device provided by the present application not only increases the output power of the heating element but also has the advantage of a simple design, effectively saving development costs.

[0070] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A heating circuit, characterized in that: It includes a resonance module, a driving module and a first switch module, wherein the resonance module is connected to a power supply and a first end of a heating element respectively, and the first switch module is connected to the driving module, the resonance module and a second end of the heating element respectively, and the first switch module is also used for grounding; The driving module is used to output a driving signal of a preset frequency; when the preset frequency is equal to the resonant frequency of the resonant module and the first switching module is turned on according to the driving signal, the resonant module is used to output a target voltage to the heating element to heat the heating element; wherein the target voltage is Q times the voltage of the power supply, Q is the quality factor of the heating circuit, and Q is greater than √2.

2. The heating circuit according to claim 1, characterized in that: The resonance module includes a first capacitor and a first inductor, the first end of the first capacitor is respectively connected to the first end of the first inductor, the first end of the heating element and the power supply, and the second end of the first capacitor is respectively connected to the second end of the first inductor, the second end of the heating element and the first switch module.

3. The heating circuit according to claim 1, characterized in that The driving module includes a signal generating unit and a driving unit, and the driving unit is connected to the signal generating unit and the first switch module respectively; The signal generating unit is used to output a first signal of a preset frequency; and the driving unit is used to output a driving signal of a preset frequency according to the first signal of the preset frequency.

4. The heating circuit according to claim 3, characterized in that: The signal generating unit includes a signal generating chip, and an output end of the signal generating chip is connected to the driving unit.

5. The heating circuit according to claim 3, characterized in that: The driving unit includes a driving chip, an input end of the driving chip is connected to the signal generating unit, and an output end of the driving chip is connected to the first switch module.

6. The heating circuit according to claim 1, characterized in that The first switch module includes a first switch tube, a gate of the first switch tube is connected to the driving module, a drain of the first switch tube is respectively connected to the resonance module and the second end of the heating element, and a source of the first switch tube is used for grounding.

7. The heating circuit according to any one of claims 1 to 6, characterized in that: The heating circuit further includes a filter module, which is connected to the resonance module and the power supply respectively; The filtering module is used to filter the voltage of the power supply.

8. The heating circuit according to claim 7, characterized in that: The filtering module includes a second capacitor and a second inductor, the first end of the second capacitor is respectively connected to the first end of the second inductor and the resonance module, the second end of the second capacitor is grounded, and the second end of the second inductor is used to connect to the power supply.

9. The heating circuit according to claim 7, characterized in that: The heating circuit further includes a second switch module, which is connected to the filter module and the power supply respectively; When the second switch module is turned on, the heating circuit starts to work; when the second switch module is turned off, the heating circuit stops working.

10. A heat-not-burn device, characterized in that: The heating circuit comprises the heating circuit according to any one of claims 1 to 9.

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