Control circuit for adjusting quiescent current of power amplifier and microwave heating aerosol generating device

Abstract

The utility model relates to the technical field of electronic circuits, and discloses a control circuit for adjusting the quiescent current of a power amplifier and a microwave heating aerosol generating device, the control circuit comprises a voltage source and an adjustable resistor, the first end of the adjustable resistor is connected with the voltage source, the second end is grounded, and the adjusting end is connected with the control end of the power amplifier; and the actual static current value of the power amplifier is equal to the preset current value by adjusting the adjustable resistor. The control circuit for adjusting the quiescent current of the power amplifier provided by the embodiment of the utility model adopts a pure hardware mode, only a fixed voltage value needs to be given by the voltage source, and the output voltage value loaded to the control end of the power amplifier is controlled by adjusting the adjustable resistor, so that the adjustment of the quiescent current of the power amplifier is completed, the adaptability is strong, and the cost is low. The device is suitable for adjustment of power amplifiers of the same model and power amplifiers of different models; the circuit is simple in implementation scheme, low in cost, implemented in a pure hardware circuit mode and high in reliability.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic circuits, in particular to a control circuit for adjusting the static current of a power amplifier and a microwave heating aerosol generating device. Background Art

[0002] With the development of technology, electronic devices have gradually become an indispensable part of our lives. From early speakers, stereos, radios to current mobile phones, Bluetooth and other devices, they have become indispensable devices in our lives. In these electronic devices, radio is used.

[0003] In the circuit of a radio device, the power amplifier is a very important component of these radio devices, and its performance directly affects the working performance of the device.

[0004] The power amplifier plays a role in amplifying and enhancing the radio signal in the link, so that the signal strength of the device is stronger and more stable, and its working performance is more reliable.

[0005] However, in the production process of the power amplifier, it will be affected by many factors such as materials, temperature, humidity, light, technology, etc., which will cause certain differences in the power amplifier. Even for power amplifiers of the same model and produced in the same batch, there will be certain differences. This difference will cause different static currents to be generated under the same gate voltage loading of the power amplifier. Different static currents will cause the deviation during the operation of the power amplifier to be amplified, thus increasing the differences between devices and making the operation less stable.

[0006] Exemplarily, applying a certain gate voltage Vg to power amplifier A, the static current output by power amplifier A meets the target value. However, when the same gate voltage Vg is applied to power amplifier B, the output static current is very likely to deviate from the target value. If this deviation is not corrected, the consistency of the power amplifier will be affected, and further affect the stability of the power amplifier during operation.

[0007] To address this problem, the current mainstream solution is to adopt a working mode combining software and hardware. The gate voltage value is sampled through a hardware circuit, then A / D conversion is performed through an AD chip, the converted value is transmitted to the memory, and then input is assigned through a software algorithm. So that the power amplifier gate voltage outputs an expected value, and then the power amplifier outputs a suitable static current value. In this way, the debugging of the power amplifier gate voltage is completed, and thus the adjustment of the power amplifier static current is realized. However, such solutions have high costs, long development cycles, and require the cooperation of software and hardware to complete. Summary of the Utility Model

[0008] In view of this, the present utility model provides a control circuit for adjusting the static current of a power amplifier and a microwave heating aerosol generating device, so as to solve the problems of high cost and long development cycle in the prior art for the software and hardware combination method of adjusting the static current for different models of power amplifiers.

[0009] In a first aspect, the present utility model provides a control circuit for adjusting the static current of a power amplifier. The control circuit includes: a voltage source and a variable resistor. Wherein, the first end of the variable resistor is connected to the voltage source, the second end is grounded, and the adjustment end is connected to the control end of the power amplifier; by adjusting the variable resistor, the actual static current value of the power amplifier is made equal to a predetermined current value.

[0010] The control circuit for adjusting the static current of the power amplifier provided by the embodiment of the present utility model adopts a pure hardware method. Only a fixed voltage value needs to be given by the voltage source, and the output voltage value applied to the control end of the power amplifier is controlled by adjusting the variable resistor, so as to complete the adjustment of the static current of the power amplifier. It has strong adaptability and is suitable for not only adjusting the same model of power amplifier, but also different models of power amplifiers; the implementation scheme of this circuit is simple, the cost is low, and it is realized by a pure hardware circuit method, with high reliability.

[0011] In an optional implementation manner, the control circuit for adjusting the static current of the power amplifier further includes: a voltage dividing circuit. The voltage dividing circuit includes: a first resistor and a second resistor connected in parallel. One end of the voltage dividing circuit is connected to the adjustment end of the variable resistor, and the other end is connected to the control end of the power amplifier.

[0012] The present utility model further improves the stability and reliability of the entire circuit by setting a voltage dividing circuit to apply a control voltage to the power amplifier, and avoids damaging the power amplifier due to improper adjustment of the resistance value of the variable resistor.

[0013] In an optional implementation manner, the control circuit for adjusting the static current of the power amplifier further includes: a filtering circuit. The filtering circuit includes at least one filtering capacitor. One end of the filtering capacitor is connected to the adjustment end of the variable resistor, and the other end is grounded.

[0014] The present utility model further ensures the stability and reliability of the voltage applied to the power amplifier by setting a filtering circuit to filter out the voltage interference applied to the power amplifier.

[0015] In an optional implementation manner, the control circuit for adjusting the static current of the power amplifier further includes: a current acquisition circuit and a control circuit. The input end of the current acquisition circuit is connected to the output end of the power amplifier, and the output end is connected to the current acquisition port of the control circuit, and is used for acquiring the actual static current value of the power amplifier and sending it to the control circuit;

[0016] The output end of the control circuit is connected to the adjustable resistor. The control circuit adjusts the resistance value of the adjustable resistor by comparing the magnitudes of the actual static current value and the predetermined current value.

[0017] The utility model realizes the automatic adjustment of the static current of the power amplifier by setting up a current acquisition circuit and a control circuit, improving the adjustment efficiency and the user experience.

[0018] In an optional embodiment, the control circuit includes: a comparator and a controller. The first input end of the comparator is externally connected to the predetermined current value, the second input end is connected to the output end of the current acquisition circuit, the output end is connected to the input end of the controller, and the output end of the controller is connected to the adjustable resistor.

[0019] The control circuit composed of a comparator and a controller in the utility model has low circuit cost and high reliability.

[0020] In an optional embodiment, the controller is an MCU.

[0021] The utility model uses an MCU as the controller, which has low cost and high reliability, further reducing the cost of the entire circuit.

[0022] In an optional embodiment, the power amplifier is a triode, and the source electrode of the triode is respectively connected to an external power supply and the input end of the current acquisition circuit.

[0023] The utility model uses a triode as the power amplifier, which has low cost and good power amplification effect.

[0024] In a second aspect, an embodiment of the utility model provides a microwave heating aerosol generating device, including: at least one microwave power amplifier, and the microwave power amplifier includes: a power amplifier and a control circuit for adjusting the static current of the power amplifier as described in the first aspect and any of its optional embodiments.

[0025] The utility model uses a microwave power amplifier composed of a control circuit for adjusting the static current of the power amplifier and a power amplifier provided in another embodiment of the invention as an important part of the microwave heating aerosol generating device. In a pure hardware manner, only a fixed voltage value needs to be given by a voltage source, and the output voltage value loaded on the control end of the power amplifier is controlled by adjusting the adjustable resistor, thereby completing the adjustment of the static current of the power amplifier. It has strong adaptability and can adapt not only to the adjustment of the same model of power amplifier but also to different models of power amplifiers; the circuit implementation scheme is simple, the cost is low, and it is realized by a pure hardware circuit method, with high reliability. The stability of the static current of the power amplifier further ensures the stability of the performance of the microwave heating aerosol generating device, improving the user experience.

[0026] In an alternative embodiment, the microwave heating aerosol generating device further includes: a microwave signal generator, a matching circuit, and a resonant cavity. The microwave signal generator is connected to the control terminal of the power amplifier in the microwave power amplifier for inputting a microwave signal to the power amplifier. The output terminal of the power amplifier is connected to the resonant cavity through the matching circuit.

[0027] The present utility model ensures the atomization effect of the aerosol generation matrix of the microwave heating aerosol generating device by using a microwave signal generator, a matching circuit, and a resonant cavity, thereby enhancing the user experience.

[0028] In an alternative embodiment, the microwave heating aerosol generating device further includes: a protection circuit, a power supply module, a detection circuit, and a control unit. The input terminals of the protection circuit and the detection circuit are respectively connected to the microwave power amplifier, and the output terminals are respectively connected to the input terminal of the control unit. The output terminal of the control unit is respectively connected to the power supply module and the control terminal of the microwave signal generator, and the output terminal of the power supply module is connected to the microwave power amplifier.

[0029] The present utility model realizes the automatic detection and control of the microwave heating aerosol generating device by setting a protection circuit, a detection circuit, and a control unit, further ensuring the stability of the microwave heating aerosol generating device and enhancing the user experience. Description of the Drawings

[0030] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 is a schematic structural diagram of a control circuit for adjusting the static current of a power amplifier according to an embodiment of the present utility model;

[0032] Figure 2 is a schematic diagram of the principle of power amplifier current regulation according to an embodiment of the present utility model;

[0033] Figure 3 is a schematic structural diagram of a microwave heating aerosol generating device according to an embodiment of the present utility model. Detailed Embodiments

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0035] During the production of power amplifiers, they are affected by many factors such as materials, temperature, humidity, light, and processes, which will cause certain differences in power amplifiers. Even for power amplifiers of the same model and produced in the same batch, there will be certain differences. This difference will cause different static currents to be generated when the same gate voltage is applied to the power amplifier. Different static currents will cause the deviation during the operation of the power amplifier to be amplified, thereby increasing the differences between devices and making the operation less stable.

[0036] Exemplarily, when a certain gate voltage value Vg is applied to power amplifier A, the static current output by power amplifier A meets the target value. However, when the same gate voltage value Vg is applied to power amplifier B, the output static current is very likely to deviate from the target value. If this deviation is not corrected, the consistency of the power amplifier will be affected, and further affect the stability of the power amplifier during operation.

[0037] To address this problem, the current mainstream solution is to adopt a working mode combining software and hardware. The gate voltage value is sampled through a hardware circuit, then A / D conversion is performed through an AD chip, the converted value is transmitted to the memory, and then input is assigned through a software algorithm. This enables the power amplifier to output a desired gate voltage value, and further enables the power amplifier to output a suitable static current value. In this way, the debugging of the gate voltage of the power amplifier is completed, thereby achieving the adjustment of the static current of the power amplifier. However, such solutions have high costs and long development cycles, and require the cooperation of software and hardware to complete.

[0038] Based on the above problems, the embodiments of the present utility model provide a control circuit for adjusting the static current of a power amplifier. Figure 1 It is a schematic structural diagram of the control circuit for adjusting the static current of a power amplifier according to the embodiments of the present utility model. As Figure 1 shown, the control circuit for adjusting the static current of a power amplifier includes: a voltage source 101 and a variable resistor R3. Among them, the first end of the variable resistor R3 is connected to the voltage source 101, the second end is grounded, and the adjustment end R3 is connected to the control end of the power amplifier U2; by adjusting the variable resistor R3, the actual static current value of the power amplifier U2 is made equal to the predetermined current value.

[0039] Specifically, the voltage source 101 is used to provide a fixed voltage value, and the specific value of this voltage can be adaptively set and adjusted according to the model of the specific power amplifier U2. The present invention is not limited thereto. The adjustable resistor R3 can be an adjustable resistor such as a slide rheostat for manually adjusting the resistance value, or an automatically adjustable resistor. Specifically, it can be flexibly selected according to the requirements of the actual control circuit and the hardware cost. The present invention is not limited thereto.

[0040] Exemplarily, as Figure 1 shown, in the embodiment of the present invention, the power amplifier U2 is taken as a triode for illustration. The source electrode of the triode is respectively connected to the external power supply and the input end of the current acquisition circuit. By using the triode as the power amplifier U2 in the present invention, the cost is low and the effect of the power amplifier U2 is good.

[0041] The control circuit for adjusting the static current of the power amplifier provided by the embodiment of the present invention adopts a pure hardware method. Only a fixed voltage value needs to be given by the voltage source, and the output voltage value applied to the control end of the power amplifier is controlled by adjusting the adjustable resistor, so as to complete the adjustment of the static current of the power amplifier. It has strong adaptability and is suitable for adjusting not only the same model of power amplifier but also different models of power amplifiers; the implementation scheme of this circuit is simple, the cost is low, and it is realized by a pure hardware circuit method, with high reliability.

[0042] In some alternative embodiments, the control circuit for adjusting the static current of the power amplifier further includes: a voltage dividing circuit 102. The voltage dividing circuit 102 includes: a first resistor R4 and a second resistor R5 connected in parallel. One end of the voltage dividing circuit 102 is connected to the adjusting end of the adjustable resistor R3, and the other end is connected to the control end of the power amplifier U2.

[0043] Among them, the specific values of the first resistor R4 and the second resistor R5 can be flexibly set according to the voltage requirements of the control end of the power amplifier U2 and the requirements for the safe operation of the circuit. The present invention is not limited thereto.

[0044] Specifically, as Figure 1 shown, the voltage Vg after the voltage source 101 passes through the adjustable resistor R3 is applied to the control end of the power amplifier U2 through the first resistor R4 and the second resistor R5 of the voltage dividing circuit 102. By setting the voltage dividing circuit to apply a control voltage to the power amplifier in the present invention, the stability and reliability of the entire circuit are further improved, and the power amplifier is prevented from being damaged due to improper adjustment of the resistance value of the adjustable resistor.

[0045] In some alternative embodiments, the control circuit for adjusting the static current of the power amplifier further includes: a filtering circuit 103. The filtering circuit 103 includes at least one filtering capacitor. One end of the filtering capacitor is connected to the adjusting end of the adjustable resistor R3, and the other end is grounded.

[0046] Exemplarily, as Figure 1As shown, the embodiments of the present utility model are described by taking three filter capacitors connected in parallel as an example. In practical applications, the number of filter capacitors provided in the filter circuit 103 can be flexibly adjusted according to the circuit design requirements, such as being set as two filter capacitors connected in parallel, etc. The present utility model is not limited thereto. The present utility model filters out the voltage interference applied to the power amplifier U2 by providing a filter circuit, further ensuring the stability and reliability of the voltage applied to the power amplifier U2.

[0047] In some alternative embodiments, the control circuit for adjusting the static current of the power amplifier further includes: a current acquisition circuit and a control circuit. The input end of the current acquisition circuit is connected to the output end of the power amplifier U2, and the output end is connected to the current acquisition port of the control circuit, and is used for acquiring the actual static current value of the power amplifier U2 and sending it to the control circuit;

[0048] The output end of the control circuit is connected to the adjustable resistor. The control circuit adjusts the resistance value of the adjustable resistor by comparing the magnitudes of the actual static current value and the predetermined current value.

[0049] Specifically, the current acquisition circuit is composed of a current sensor, and can also be implemented by using other circuit structures with specific current detection functions in the prior art, as long as the circuit detection function can be realized. The present utility model is not limited thereto. The present utility model realizes the automatic adjustment of the static current of the power amplifier U2 by providing a current acquisition circuit and a control circuit, improving the adjustment efficiency and the user experience.

[0050] In some alternative embodiments, the control circuit includes: a comparator and a controller. The first input end of the comparator is externally connected to the predetermined current value, the second input end is connected to the output end of the current acquisition circuit, the output end is connected to the input end of the controller, and the output end of the controller is connected to the adjustable resistor.

[0051] Wherein, the predetermined current value is the static current value of the power amplifier U2 set in advance according to the application scenario requirements of the power amplifier U2. The comparator outputs a first level signal when the actual static current value collected by the current acquisition circuit is less than the predetermined current value, and outputs a second level signal when the actual static current value is greater than the predetermined current value. The controller increases or decreases the resistance value of the adjustment resistor connected to the circuit based on the first level signal or the second level signal, thereby realizing the automatic adjustment of the static current value at the output end of the power amplifier U2. It should be noted that the controller adjusts the resistance value of the adjustment resistor based on different level signals output by the comparator, which is a function that can be realized by the hardware structure of the controller itself. The specific adjustment principle and adjustment process can refer to the working principles and working processes of existing controls such as MCU chips, and will not be elaborated herein.

[0052] The control circuit composed of a comparator and a controller in the present utility model has low circuit cost and high reliability.

[0053] In some alternative embodiments, the controller is an MCU. By using an MCU as the controller, the present utility model has low cost and high reliability, and further reduces the cost of the entire circuit. In practical applications, the controller can be implemented by using an inherent controller in the circuit where the power amplifier U2 is located, such as an MCU, without adding other controllers additionally, so as to further reduce the hardware cost of the circuit.

[0054] In addition, in practical applications, the adjustable resistor R3 can also be deleted, and the controller directly applies a voltage value to the control terminal of the power amplifier U2. The controller can adopt a pre-stored value method to store some values required for the grid voltage of the power amplifier. Then, in the initial state, the controller directly assigns a typical preset grid voltage value to the power amplifier U2, and then compares the output current value on the power amplifier U2 with the target predetermined current value. According to a certain algorithm, a suitable grid voltage value is selected from the pre-stored grid voltage values and assigned to the power amplifier U2 to obtain a suitable grid voltage value, thereby realizing the adjustment of the static current of the power amplifier in a pure software manner.

[0055] Next, the working principle and working process of the control circuit for adjusting the static current of the power amplifier provided by the embodiments of the present utility model will be described in detail in combination with specific application examples.

[0056] Exemplarily, as Figure 1 shown, in the figure, R3 is an adjustable resistor, U2 is a power amplifier, the input is the input port of the wireless signal, and the output is the output port of the wireless signal. Vg is the voltage value output by the external fixed voltage value port of the voltage source to adjust the voltage value divided by the adjustable resistor R3. The voltage value of Vg is loaded onto the gate of the power amplifier U2 through R4 and R5 to complete the gate voltage loading of the power amplifier U2. VD is input to the drain of the power amplifier U2 through an external power supply, so that U2 can normally amplify the input wireless signal.

[0057] As Figure 1 and Figure 2 shown, the present utility model applies a fixed voltage value to the external fixed voltage value port through the power supply module, i.e., the voltage source 101. This value is determined according to the model of the power amplifier U2 used, and this fixed voltage value can be completed and matched through the design of the power supply (voltage source). Then, by dynamically adjusting the adjustable resistor R3, the output value of the gate voltage Vg is adjusted. When the gate voltage Vg makes the static state of the power amplifier U2 reach the predetermined current value, the gate voltage modulation is completed, thereby realizing the adjustment of the static current value of the power amplifier U2.

[0058] The control circuit for adjusting the static current of the power amplifier provided by the embodiment of the present utility model adopts a pure hardware method. Only a fixed voltage value needs to be given by a voltage source, and the output voltage value loaded to the control end of the power amplifier is controlled by adjusting the adjustable resistor, so as to complete the adjustment of the static current of the power amplifier. It has strong adaptability and is suitable for not only adjusting power amplifiers of the same model but also different models; the implementation scheme of this circuit is simple, the cost is low, and it is realized by a pure hardware circuit method, with high reliability. The embodiment of the present utility model also provides a microwave heating aerosol generating device, including: at least one microwave power amplifier 301, and the microwave power amplifier 301 includes: a power amplifier U2 and as Figure 1 shown in the control circuit for adjusting the static current of the power amplifier. Exemplarily, in Figure 3 two cascaded microwave power amplifiers 301 are taken as an example for illustration. In actual applications, the number of microwave power amplifiers can be flexibly set according to the actual needs of the microwave heating aerosol generating device, and the present utility model is not limited thereto.

[0059] By using the microwave power amplifier composed of the control circuit for adjusting the static current of the power amplifier and the power amplifier provided by another embodiment of the present invention as an important part of the microwave heating aerosol generating device, adopting a pure hardware method, only a fixed voltage value needs to be given by a voltage source, and the output voltage value loaded to the control end of the power amplifier is controlled by adjusting the adjustable resistor, so as to complete the adjustment of the static current of the power amplifier. It has strong adaptability and is suitable for not only adjusting power amplifiers of the same model but also different models; the implementation scheme of this circuit is simple, the cost is low, and it is realized by a pure hardware circuit method, with high reliability. The stability of the static current of the power amplifier further guarantees the stability of the performance of the microwave heating aerosol generating device and improves the user experience.

[0060] In some optional implementation manners, as Figure 3 shown, the microwave heating aerosol generating device further includes: a microwave signal generator 302, a matching circuit 303 and a resonant cavity 304. The microwave signal generator 302 is connected to the control end of the power amplifier U2 in the microwave power amplifier 301 for inputting a microwave signal to the power amplifier U2, and the output end of the power amplifier U2 is connected to the resonant cavity 304 through the matching circuit 303.

[0061] Specifically, the specific circuit structures of the above microwave signal generator 302, matching circuit 303 and resonant cavity 304 are the conventional circuit structures of existing microwave heating aerosol generating devices, and their working principles and specific working processes are prior art. For details, reference can be made to the relevant descriptions of the prior art, and no further elaboration will be given here.

[0062] The present utility model guarantees the atomization effect of the aerosol generation matrix of the microwave heating aerosol generating device by using a microwave signal generator, a matching circuit and a resonant cavity, and improves the user experience.

[0063] In some alternative embodiments, the microwave heating aerosol generating device further includes: a protection circuit 305, a power supply module 306, a detection circuit 307, and a control unit 308. The input ends of the protection circuit 305 and the detection circuit 307 are respectively connected to the microwave power amplifier 301, and the output ends are respectively connected to the input end of the control unit 308. The output end of the control unit 308 is respectively connected to the control ends of the power supply module 306 and the microwave signal generator 302, and the output end of the power supply module 306 is connected to the microwave power amplifier 301.

[0064] Among them, the protection circuit 305 is used to implement circuit protection functions such as overvoltage protection and overcurrent protection of the microwave heating aerosol generating device. The power supply module 306 includes the voltage source of the control circuit for adjusting the static current of the power amplifier and other power supplies required for the entire circuit of the microwave heating aerosol generating device, and supplies power to each component of the microwave heating aerosol generating device. The detection circuit 307 may include the above-mentioned current acquisition circuit, and may also include other detection function circuits, which are specifically set flexibly according to the circuit function requirements of the microwave heating aerosol generating device, and the present invention is not limited thereto.

[0065] Specifically, the specific circuit structures of the above-mentioned protection circuit 305, power supply module 306, detection circuit 307, and control unit 308 are the conventional circuit structures of existing microwave heating aerosol generating devices. Their working principles and specific working processes are prior art, and specific references can be made to the relevant descriptions of the prior art, and will not be elaborated here. It should be noted that in practical applications, the control unit 308 can be implemented by using the same controller as the controller of the above-mentioned power amplifier U2 and the controller of the control circuit for adjusting the static current of the power amplifier, such as an MCU chip, to improve the integration of the circuit structure of the entire microwave heating aerosol generating device and reduce the circuit hardware cost.

[0066] The present invention realizes the automatic detection and control of the microwave heating aerosol generating device by setting up a protection circuit, a detection circuit, and a control unit, further ensuring the stability of the microwave heating aerosol generating device and improving the user experience.

[0067] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A control circuit for adjusting the quiescent current of a power amplifier, characterized in that: include: A voltage source and an adjustable resistor, where The first end of the adjustable resistor is connected to the voltage source, the second end is grounded, and the adjustment end is connected to the control end of the power amplifier; The adjustable resistor is adjusted so that the actual static current value of the power amplifier is equal to the predetermined current value.

2. The control circuit for adjusting the quiescent current of a power amplifier according to claim 1, characterized in that: Also includes: A voltage divider circuit, the voltage divider circuit comprises: a first resistor and a second resistor connected in parallel, one end of the voltage divider circuit is connected to the adjustment end of the adjustable resistor, and the other end is connected to the control end of the power amplifier.

3. The control circuit for adjusting the quiescent current of a power amplifier according to claim 1, characterized in that: Also includes: The filter circuit comprises at least one filter capacitor, one end of the filter capacitor is connected to the adjustment end of the adjustable resistor, and the other end is grounded.

4. The control circuit for adjusting the quiescent current of a power amplifier according to any one of claims 1 to 3, characterized in that: Also includes: A current collection circuit and a control circuit, wherein the input end of the current collection circuit is connected to the output end of the power amplifier, and the output end is connected to the current collection port of the control circuit, and is used to collect the actual static current value of the power amplifier and send it to the control circuit; The output end of the control circuit is connected to the adjustable resistor, and the control circuit adjusts the resistance value of the adjustable resistor by comparing the actual static current value with the predetermined current value.

5. The control circuit for adjusting the quiescent current of a power amplifier according to claim 4, characterized in that: The control circuit includes: a comparator and a controller, wherein the first input terminal of the comparator is externally connected to the predetermined current value, the second input terminal is connected to the output terminal of the current acquisition circuit, the output terminal is connected to the input terminal of the controller, and the output terminal of the controller is connected to the adjustable resistor.

6. The control circuit for adjusting the quiescent current of a power amplifier according to claim 5, characterized in that: The controller is MCU.

7. The control circuit for adjusting the quiescent current of a power amplifier according to claim 4, characterized in that: The power amplifier is a triode, and the source of the triode is respectively connected to an external power supply and an input end of the current collection circuit.

8. A microwave-heated aerosol generating device, characterized in that: include: At least one microwave power amplifier, the microwave power amplifier comprising: a power amplifier and a control circuit for adjusting a quiescent current of the power amplifier as described in any one of claims 1-7.

9. The microwave-heated aerosol generating device according to claim 8, characterized in that: Also includes: A microwave signal generator, a matching circuit and a resonant cavity, wherein the microwave signal generator is connected to the control end of the power amplifier in the microwave power amplifier and is used to input a microwave signal to the power amplifier, and the output end of the power amplifier is connected to the resonant cavity through the matching circuit.

10. The microwave-heated aerosol generating device according to claim 9, characterized in that: Also includes: A protection circuit, a power module, a detection circuit and a control unit, wherein the input ends of the protection circuit and the detection circuit are respectively connected to the microwave power amplifier, and the output ends are respectively connected to the input end of the control unit, the output end of the control unit is respectively connected to the power module and the control end of the microwave signal generator, and the output end of the power module is connected to the microwave power amplifier.

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