Push-pull inverter circuit and high-frequency power supply device

Abstract

This invention provides a push-pull inverter circuit and a high-frequency power supply device. The push-pull inverter circuit includes an input interface and a transformer module. The transformer module includes a primary winding and a secondary winding. A first switching module is connected between the input interface and a first end of the primary winding, and its control terminal is used to input a first control signal. A second switching module is connected between the first end of the primary winding and a ground terminal, and its control terminal is used to input a second control signal. A voltage divider network is connected between the input interface and the ground terminal, and the voltage divider output terminal of the voltage divider network is connected to the second end of the primary winding. An inductor module is connected between the secondary winding and the target load, forming a resonant network. The resonant network is used to adjust the soft switching of the first switching module according to the first control signal and to adjust the soft switching of the second switching module according to the second control signal. The technical solution provided by this invention reduces the system cost of the push-pull inverter circuit.

Description

Technical Field

[0001] This utility model relates to the field of circuit technology, and in particular to a push-pull inverter circuit and a high-frequency power supply device. Background Technology

[0002] High-frequency inverter circuits are widely used in information technology, industrial automation, medical equipment, aerospace, and other fields. Existing push-pull inverter circuits typically require switching transistors with voltages greater than three times the input voltage, necessitating high voltage withstand capabilities and resulting in high transistor costs. Furthermore, the transformer design in existing push-pull inverter circuits is relatively complex, leading to high transformer costs. Therefore, existing push-pull inverter circuits suffer from a high cost problem. Utility Model Content

[0003] This utility model provides a push-pull inverter circuit and a high-frequency power supply device to solve the problem of high cost of push-pull inverter circuits.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] This utility model embodiment provides a push-pull inverter circuit, including:

[0006] Input interface, used for inputting DC signals;

[0007] A transformer module, the transformer module comprising a primary winding and a secondary winding;

[0008] A first switch module is connected between the input interface and the first end of the primary coil, and the control terminal of the first switch module is used to input a first control signal;

[0009] The second switch module is connected between the first end of the primary coil and the ground end, and the control end of the second switch module is used to input the second control signal;

[0010] A voltage divider network is connected between the input interface and the ground terminal, and the voltage divider output terminal of the voltage divider network is connected to the second terminal of the primary coil.

[0011] An inductor module is connected between the secondary coil and the target load. The inductor module and the target load form a resonant network. The resonant network is used to adjust the soft switching of the first switching module according to the first control signal and to adjust the soft switching of the second switching module according to the second control signal.

[0012] Optionally, the turns ratio of the primary coil to the secondary coil of the transformer module is 1:1.

[0013] Optionally, the voltage divider network includes a first capacitor and a second capacitor. A first terminal of the first capacitor is connected to the input interface, and a second terminal of the first capacitor is connected to the first terminal of the second capacitor, serving as the voltage divider output terminal of the voltage divider network. The second terminal of the second capacitor is connected to the ground terminal.

[0014] Optionally, the first switching module includes a first gallium nitride switching transistor;

[0015] The second switching module includes a second gallium nitride switch.

[0016] Optionally, the inductor module includes a first inductor;

[0017] The target load includes a capacitive load, and the push-pull inverter circuit outputs an AC signal to the target load.

[0018] Optionally, the push-pull inverter circuit further includes:

[0019] An input capacitor is connected between the input interface and the ground terminal.

[0020] Optionally, the switching frequency of the first switching module is adjustable, and the switching frequency of the second switching module is adjustable; the adjustment range of the switching frequency includes 4.1MHz-4.4MHz;

[0021] The peak-to-peak value range of the target load is adjustable, and the voltage adjustment range of the peak-to-peak value of the target load includes ±16.8V to ±29.7V.

[0022] Optionally, the transformer module includes a transformer;

[0023] The transformer includes a first circuit board and a second circuit board, which at least partially overlap; the primary winding is disposed on the first circuit board, and the secondary winding is disposed on the second circuit board.

[0024] Optionally, when the target load is connected to the inductor module, the switching stress of the first switch module is 1 times the voltage of the input interface; the switching stress of the second switch module is 1 times the voltage of the input interface.

[0025] When the target load is disconnected from the inductor module, the stress of the first switch module and / or the second switch module is less than or equal to the rated safe voltage.

[0026] Secondly, this embodiment provides a high-frequency power supply device, characterized in that it includes: a push-pull inverter circuit provided in any of the items in the first aspect.

[0027] The push-pull inverter circuit provided in this embodiment of the invention features a transformer module comprising a primary winding and a secondary winding, along with a voltage divider module. This results in a simple transformer module structure and lower voltage withstand requirements for both the first and second switching modules, thus reducing the cost of both the transformer module and the first and second switching modules. Furthermore, by forming a resonant network between the inductor module and the target load, the first switching module can be adjusted to achieve soft switching based on a first control signal, reducing its switching losses. Similarly, the second switching module can be adjusted to achieve soft switching based on a second control signal, further reducing its switching losses. This configuration, through the resonant network formed by the target load and the inductor module, effectively reduces the number of components in the push-pull inverter circuit, further lowering its cost. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments 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 the content of the embodiments of this utility model and these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of a push-pull inverter circuit provided in an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of another push-pull inverter circuit provided in this embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of another push-pull inverter circuit provided in this embodiment of the utility model;

[0032] Figure 4 This is a schematic diagram of the voltage waveform of the target load in a push-pull inverter circuit provided in this embodiment of the present invention;

[0033] Figure 5 This is a waveform diagram of a first or second switching module of a push-pull inverter circuit implementing soft switching, provided by an embodiment of this utility model.

[0034] Figure 6 This is a waveform diagram of the voltage range of the target load corresponding to the frequency adjustment of a push-pull inverter circuit provided in this embodiment of the utility model;

[0035] Figure 7 This is a schematic diagram of the first layer circuit board of a transformer module of a push-pull inverter circuit provided in this embodiment of the present invention;

[0036] Figure 8This is a schematic diagram of the second-layer circuit board of a transformer module of a push-pull inverter circuit provided in this embodiment of the present invention;

[0037] Figure 9 This is a schematic diagram of the soft-switching characteristics of a push-pull inverter circuit provided in an embodiment of this utility model;

[0038] Figure 10 This is a schematic diagram of the withstand voltage waveform of the switch when the target load of a push-pull inverter circuit is lost, according to an embodiment of this utility model. Detailed Implementation

[0039] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0040] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0041] Based on the above-mentioned technical problems, this embodiment proposes the following solutions:

[0042] Figure 1 This is a schematic diagram of a push-pull inverter circuit provided in an embodiment of this utility model. See also... Figure 1The push-pull inverter circuit provided in this embodiment includes an input interface IN for inputting a DC signal; a transformer module 3, which includes a primary coil n1 and a secondary coil n2; a first switch module 1 connected between the input interface IN and a first end of the primary coil n1, the control terminal of the first switch module 1 being used to input a first control signal; a second switch module 2 connected between the first end of the primary coil n1 and a ground terminal, the control terminal of the second switch module 2 being used to input a second control signal; a voltage divider network 4 connected between the input interface IN and the ground terminal, the voltage divider output terminal of the voltage divider network 4 being connected to the second end of the primary coil n1; and an inductor module 5 connected between the secondary coil n2 and a target load Z1, the inductor module 5 and the target load Z1 forming a resonant network 10, the resonant network being used to adjust the soft switching of the first switch module 1 according to the first control signal, and to adjust the soft switching of the second switch module 2 according to the second control signal.

[0043] Specifically, the input interface IN refers to the DC voltage input terminal of the push-pull circuit. It is provided by a battery, DC power supply, or other DC power source. For example, the DC voltage V provided by the input interface IN... DC It can be 12V, 24V or 48V, etc.

[0044] Transformer module 3 refers to the device used to adjust and convert voltage in a push-pull inverter circuit. Primary coil n1 is the coil located at the input terminal of transformer module 3, used to receive the input voltage and generate a magnetic field. Secondary coil n2 is the coil in transformer module 3 opposite to the primary coil n1, responsible for inducing voltage from the magnetic field and outputting it to the target load Z1.

[0045] The first switching module 1 refers to the DC circuit section of the push-pull inverter circuit, which is a switching device used to control the flow of current. The second switching module 2 refers to the DC circuit section of the push-pull inverter circuit, which is another switching device used to control the flow of current. The function of the first switching module 1 and the second switching module 2 is to adjust the output voltage and frequency of the circuit through rapid switching operations, thereby achieving efficient power conversion and output control. For example, the first switching module 1 can be a MOSFET or an IGBT, etc.

[0046] The first control signal and the second control signal can be PWM control signals. For example, when the first control signal is high and the second control signal is low, the first control module is turned on and the second control module is turned off; when the first control signal is low and the second control signal is high, the first control module is turned off and the second control module is turned on.

[0047] The voltage divider output terminal of the voltage divider module is connected to the second terminal of the primary coil n1, so that the voltages at both ends of the first switch module 1 and the second switch module 2 are divided by the voltage divider module, which effectively avoids the voltages at both ends of the first switch module 1 and the second switch module 2 being too high, thereby reducing the voltage rating selection cost of the first switch module 1 and the second switch module 2.

[0048] By configuring the primary coil n1 and the secondary coil n2, the two ends of the first switch module 1 and the second switch module 2 are made to have only one times the DC voltage V of the input interface IN. DC This can reduce the structural complexity and cost of transformer module 3, and also reduce the withstand voltage at both ends of the first switch module 1 and the second switch module 2, further reducing the device cost of the first switch module 1 and the second switch module 2.

[0049] The target load Z1 can be a capacitive load. The inductor module 5 is an inductive element. By setting the inductor module 5 and the target load Z1 to form a resonant network 10, the resonant network is used to adjust the first switching module 1 to achieve soft switching according to the first control signal, thereby reducing the switching loss of the first switching module 1; and to adjust the second switching module 2 to achieve soft switching according to the second control signal, thereby reducing the switching loss of the second switching module 2.

[0050] The push-pull inverter circuit provided in this embodiment of the invention features a transformer module 3 comprising a primary coil n1 and a secondary coil n2, along with a voltage divider module. This results in a simple transformer module 3 structure and lower voltage withstand requirements for the first and second switching modules 1 and 2, thus reducing the cost of both the transformer module 3 and the first and second switching modules 1 and 2. Furthermore, by forming a resonant network between the inductor module 5 and the target load Z1, the first switching module 1 can be adjusted to achieve soft switching based on a first control signal, reducing its switching losses. Similarly, the second switching module 2 can be adjusted to achieve soft switching based on a second control signal, reducing its switching losses. This configuration, through the resonant network formed by the target load Z1 and the inductor module 5, effectively reduces the number of components in the push-pull inverter circuit, further lowering its cost.

[0051] Optionally, based on the above embodiments, see also... Figure 1 The turns ratio of the primary coil n1 and the secondary coil n2 of the transformer module 3 is 1:1.

[0052] Specifically, compared to transformers with intermediate taps in related technologies, the primary winding n1 and secondary winding n2 of the transformer module 3 provided in this embodiment each consist of only a single coil. This configuration ensures that when the first switch module 1 or the second switch module 2 is turned on, the voltage across either the turned-on module 1 or the turned-on module 2 is only one times the DC voltage V of the input interface IN.DC This configuration reduces the voltage across the first switch module 1 and the second switch module 2, allowing the selection of components with lower voltage withstand capability for the first switch module 1 and the second switch module 2. This effectively reduces the component costs of the first switch module 1 and the second switch module 2 and increases their lifespan.

[0053] Optional, Figure 2 This is a schematic diagram of another push-pull inverter circuit provided in an embodiment of the present invention. Based on the above embodiments, and in conjunction with… Figure 1 and Figure 2 The voltage divider network 4 includes a first capacitor C1 and a second capacitor C2. The first end of the first capacitor C1 is connected to the input interface IN, and the second end of the first capacitor C1 is connected to the first end of the second capacitor C2, serving as the voltage divider output terminal of the voltage divider network 4. The second end of the second capacitor C2 is connected to the ground terminal.

[0054] Specifically, the first capacitor C1 and the second capacitor C2 act as a voltage divider. By setting the first capacitor C1 and the second capacitor C2, the voltage across the first switch module 1 and the second switch module 2 is further reduced. This allows the selection of the first switch module 1 and the second switch module 2 with weaker voltage withstand capability, thereby reducing the device cost of the first switch module 1 and the second switch module 2.

[0055] In one optional implementation, the capacitive reactance values ​​of the first capacitor C1 and the second capacitor C2 can be set to be equal, so that the voltage divisions across the first switching module 1 and the second switching module 2 are equal, thereby making the peak values ​​of the voltages induced by the positive current and the negative current equal.

[0056] Optionally, based on the above embodiments, further combinations can be made... Figure 1 and Figure 2 The first switching module 1 includes a first gallium nitride switch; the second switching module 2 includes a second gallium nitride switch.

[0057] Specifically, a gallium nitride (GaN) switch is a semiconductor switching device made of gallium nitride material, used for efficient power conversion and signal processing. Compared with traditional silicon switches, GaN switches have higher electron mobility, lower on-resistance, and higher voltage withstand capability. This embodiment, by setting the first switching module 1 to include a first GaN switch and the second switching module 2 to include a second GaN switch, enables both the first and second GaN switches to be suitable for high-frequency, high-power applications, such as in beauty devices like atomizers, achieving rapid switching operation. This allows the push-pull inverter circuit provided in this embodiment to be applied in ultra-high frequency scenarios exceeding 4MHz.

[0058] Optionally, based on the above embodiments, further combinations can be made... Figure 1 and Figure 2 The inductor module 5 includes a first inductor L1; the target load Z1 includes a capacitive load; and the push-pull inverter circuit outputs an AC signal to the target load Z1.

[0059] Specifically, the first inductor L1 and the capacitive load Z1 of the target load form a resonant network. This resonant network enables the switching module 1 and the second switching module 2 to be turned on when the voltage between their drains and sources is zero or close to zero, thereby achieving soft turn-on of the first and second switching modules and reducing their switching losses. Furthermore, this embodiment only requires the first inductor L1, cleverly utilizing the capacitive load to form a resonant network with it, eliminating the need for capacitors to form the resonant network. This simplifies the structure of the push-pull inverter circuit and further reduces its cost.

[0060] Optional, Figure 3 This is a schematic diagram of another push-pull inverter circuit provided in this embodiment of the present invention. Based on the above embodiments, and in conjunction with… Figures 1 to 3 The push-pull inverter circuit further includes an input capacitor Cin, which is connected between the input interface IN and the ground terminal.

[0061] Specifically, the input capacitor Cin serves as a voltage regulator. By placing the input capacitor Cin between the input interface IN and the ground terminal, the DC voltage V of the input interface IN can be regulated through the input capacitor Cin. DC Voltage regulation is performed to improve the stability of the AC voltage output of the push-pull inverter circuit, thereby improving the stability and applicability of the push-pull inverter circuit.

[0062] Optional, Figure 4 This is a schematic diagram of the voltage waveform of the target load Z1 in a push-pull inverter circuit provided in this embodiment of the present invention. Figure 5 This is a waveform diagram illustrating the soft switching implementation of the first switching module 1 or the second switching module 2 in a push-pull inverter circuit provided by an embodiment of this utility model. Figure 6 This is a waveform diagram illustrating the voltage range of the target load Z1 corresponding to the frequency regulation of a push-pull inverter circuit according to an embodiment of this utility model. Based on the above embodiments, and combined with... Figures 1 to 6 The switching frequency of the first switching module 1 is adjustable, and the switching frequency of the second switching module 2 is adjustable; the adjustment range of the switching frequency includes 4.1MHz-4.4MHz; the peak-to-peak range of the target load Z1 is adjustable, and the voltage adjustment range of the peak-to-peak value of the target load Z1 includes ±16.8V-±29.7V.

[0063] Specifically, a first control signal and a second control signal can be generated by an external control device. This external control device can be, for example, a microcontroller or a single-chip microcomputer. By adjusting the switching frequencies of the first and second control signals, the peak-to-peak value range of the output AC voltage can be adjusted. The duty cycle and frequency of the first and second control signals can be the same. The switching periods of the first and second control signals are different, thus allowing the first switching module 1 and the second switching module 2 to conduct alternately. The higher the switching frequency of the first switching module 1 and the second switching module 2, the lower the peak-to-peak value amplitude of the AC voltage output to the target load Z1. This configuration, without changing the circuit structure of the push-pull inverter circuit, achieves adjustable peak-to-peak value of the output AC voltage, improving the application range of the push-pull inverter circuit and reducing hardware upgrade costs.

[0064] It should be noted that, Figure 4 The example shown is a waveform of the AC voltage output by a push-pull inverter circuit, where V(Z1) is an example. Figure 5 An exemplary diagram shows the waveform of the voltage between the source and drain of the first gallium nitride switch, V(Vsw1). The waveform of the voltage between the gate and source of the first gallium nitride switch is also shown. Figure 6 The example shows the waveform of the AC voltage output by a push-pull inverter circuit. Figure 6 The blue waveform represents the peak-to-peak AC voltage output of the push-pull inverter circuit at a frequency of ±29.7V when the switching frequency of the first switching module 1 and the second switching module 2 is 4.1MHz. Figure 6 The red waveform in the middle represents the AC voltage peak-to-peak value of the push-pull inverter circuit output when the switching frequency of the first switch module 1 and the second switch module 2 is 4.4MHz, and no limitations are made here.

[0065] Optional, Figure 7 This is a schematic diagram of the first layer circuit board of the transformer module 3 of a push-pull inverter circuit provided in this embodiment of the present invention. Figure 8 This is a schematic diagram of the second-layer circuit board of the transformer module 3 of a push-pull inverter circuit provided in an embodiment of this utility model. Based on the above embodiments, and combined with... Figures 1 to 8 The transformer module 3 includes a transformer; the transformer includes a first circuit board M1 and a second circuit board M2, the first circuit board and the second circuit board at least partially overlap; the primary coil n1 is disposed on the first circuit board, and the secondary coil n2 is disposed on the second circuit board.

[0066] Specifically, since the transformer consists of only one primary winding n1 and one secondary winding n2, it can be configured as a simple two-layer circuit board, resulting in a smaller structure and lower cost. Preferably, the first and second circuit boards are stacked along the thickness direction, which further reduces the transformer's size and the cost of the push-pull inverter circuit.

[0067] Optional, Figure 9 This is a schematic diagram of the soft-switching characteristics of a push-pull inverter circuit provided in an embodiment of this utility model. Figure 10 This is a schematic diagram of the withstand voltage waveform of the switch when the target load Z1 of a push-pull inverter circuit is disconnected, according to an embodiment of this utility model. Based on the above embodiments, further combining... Figures 1 to 10 When the target load Z1 is connected to the inductor module 5, the switching stress of the first switch module 1 is 1 times the voltage of the input interface IN; the switching stress of the second switch module 2 is 1 times the voltage of the input interface IN; when the target load Z1 is disconnected from the inductor module 5, the stress of the first switch module 1 and / or the second switch module 2 is less than or equal to the rated safe voltage.

[0068] Specifically, when the target load Z1 is connected to the inductor module 5, since the first inductor L1 and the target load Z1 form a resonant network, the switching stress of the first switch module 1 is equal to the voltage of the input interface IN. The switching stress of the second switch module 2 is also equal to the voltage of the input interface IN. Figure 9 The example illustrates a scenario where, when the input interface IN voltage is 12V and the target load Z1 is connected to the inductor module 5, the voltage V(sw1) between the source and drain of the first gallium nitride switch SW1 is 12V. This means the stress on the first switching module 1 is equal to the input interface IN voltage. In the case where the voltage V(vgs1) between the gate and source of the first gallium nitride switch SW1 is 5V, and V(vgs1) and V(sw1) have no overlapping region, the first gallium nitride switch SW1 achieves soft switching.

[0069] When the target load Z1 is disconnected from the inductor module 5, that is, when the target load Z1 is disconnected from the output terminal of the push-pull inverter circuit, the stress of the first switch module 1 and / or the second switch module 2 is less than or equal to the rated safe voltage. This setting further improves the safety of the first switch module 1 and the second switch module 2, and further improves the service life of the push-pull inverter circuit. Figure 10The example illustrates a scenario where, when the input interface IN voltage is 12V and the target load Z1 is disconnected from the inductor module 5, the voltage V(sw1) between the source and drain of the first gallium nitride switch SW1 is 12V. This means the stress on the first switch module 1 is equal to the input interface IN voltage, which is within the calibrated safe voltage range. In the case where the voltage V(vgs1) between the gate and source of the first gallium nitride switch SW1 is 5V, and V(vgs1) and V(sw1) overlap, the first gallium nitride switch SW1 performs a hard switch when the target load Z1 is disconnected from the inductor module 5.

[0070] Based on the same inventive concept, this embodiment provides a high-frequency power supply device. The high-frequency power supply device provided in this embodiment includes the push-pull inverter circuit provided in any of the above embodiments, and has the beneficial effects of the push-pull inverter circuit provided in any of the above embodiments, which will not be repeated here.

[0071] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A push-pull inverter circuit, characterized in that, include: Input interface, used for inputting DC signals; A transformer module, the transformer module comprising a primary winding and a secondary winding; A first switch module is connected between the input interface and the first end of the primary coil, and the control terminal of the first switch module is used to input a first control signal; The second switch module is connected between the first end of the primary coil and the ground end, and the control end of the second switch module is used to input the second control signal; A voltage divider network is connected between the input interface and the ground terminal, and the voltage divider output terminal of the voltage divider network is connected to the second terminal of the primary coil. An inductor module is connected between the secondary coil and the target load. The inductor module and the target load form a resonant network. The resonant network is used to adjust the soft switching of the first switching module according to the first control signal and to adjust the soft switching of the second switching module according to the second control signal.

2. The push-pull inverter circuit according to claim 1, characterized in that, The turns ratio of the primary coil to the secondary coil of the transformer module is 1:

1.

3. The push-pull inverter circuit according to claim 1, characterized in that, The voltage divider network includes a first capacitor and a second capacitor. The first end of the first capacitor is connected to the input interface, and the second end of the first capacitor is connected to the first end of the second capacitor, serving as the voltage divider output terminal of the voltage divider network. The second end of the second capacitor is connected to the ground terminal.

4. The push-pull inverter circuit according to claim 1, characterized in that, The first switching module includes a first gallium nitride switching transistor; The second switching module includes a second gallium nitride switch.

5. The push-pull inverter circuit according to claim 1, characterized in that, The inductor module includes a first inductor; The target load includes a capacitive load, and the push-pull inverter circuit outputs an AC signal to the target load.

6. The push-pull inverter circuit according to claim 1, characterized in that, The push-pull inverter circuit also includes: An input capacitor is connected between the input interface and the ground terminal.

7. The push-pull inverter circuit according to claim 1, characterized in that, The switching frequency of the first switching module is adjustable, and the switching frequency of the second switching module is adjustable; the adjustment range of the switching frequency includes 4.1MHz-4.4MHz; The peak-to-peak value range of the target load is adjustable, and the voltage adjustment range of the peak-to-peak value of the target load includes ±16.8V to ±29.7V.

8. The push-pull inverter circuit according to claim 1, characterized in that, The transformer module includes a transformer; The transformer includes a first circuit board and a second circuit board, which at least partially overlap; the primary winding is disposed on the first circuit board, and the secondary winding is disposed on the second circuit board.

9. The push-pull inverter circuit according to claim 1, characterized in that, When the target load is connected to the inductor module, the switching stress of the first switch module is 1 times the voltage of the input interface; the switching stress of the second switch module is 1 times the voltage of the input interface. When the target load is disconnected from the inductor module, the stress of the first switch module and / or the second switch module is less than or equal to the rated safe voltage.

10. A high-frequency power supply device, characterized in that, include: The push-pull inverter circuit according to any one of claims 1 to 9.

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