Inverse conversion switching circuit, high frequency power supply E class fixed frequency power amplifier parallel drive system

Abstract

The present invention relates to a power inversion switching circuit and a class E fixed frequency power amplifier parallel drive system for high frequency power supplies, which belongs to the high frequency technical field and solves problems such as transistor breakdown in push-pull inverters. In this circuit, first and second square wave DC power supplies are input to the opposite polarity end and the same polarity end of a primary coil of a transformer, respectively, the first and second square wave DC power supplies alternately go high level, the same polarity end of the first and second secondary coils of the transformer are connected to the input ends of a first backflow prevention clamp module and a second backflow prevention clamp module, the output ends of the first backflow prevention clamp module and the second backflow prevention clamp module are connected to the gates of a first switching transistor and a second switching transistor, respectively, the drains of the first switching transistor and the second switching transistor are connected to the switching signal output end of the power inversion switching circuit, the opposite polarity end of the first and second secondary coils are grounded, the clamp ends of the first backflow prevention clamp module and the second backflow prevention clamp module are grounded, and the sources of the first switching transistor and the second switching transistor are grounded.

Description

[Technical Field]

[0001] The present invention relates to the technical field of high frequency, and in particular to an inverse conversion switching circuit and a class E fixed frequency power amplifier parallel drive system for high frequency power supplies. [Background technology]

[0002] The conventional push-pull inverter parallel connection output drive circuit utilizes the fixed frequency operating characteristics of the inverter drive circuit and combines with a bus to provide a constant DC, and utilizes the fixed frequency characteristics of the switching transistor inverter circuit and the combined characteristics that can be connected in parallel to form a power amplifier to provide a fixed frequency, high-power high-frequency power output.

[0003] The potential points at the upper and lower ends of the output terminal of a push-pull inverter are generally connected to the bus potential, but this is always limited by the element performance of the switching transistor. If the withstand voltage of the push-pull switching transistor is insufficient, it is likely to cause transistor breakdown, electronic component explosion, and circuit burnout. Summary of the Invention

[0004] In view of the above analysis, an embodiment of the present invention aims to provide an inverse conversion switching circuit and a high frequency power supply class E fixed frequency power amplifier parallel drive system to solve the problem that conventional push-pull inverters are prone to transistor breakdown, electronic component explosion, etc.

[0005] In one aspect, the present invention provides an inverter switching circuit, including a transformer, a first switching transistor, a second switching transistor, a first backflow prevention clamp module, and a second backflow prevention clamp module; The first square wave DC power supply and the second square wave DC power supply are respectively input to the opposite polarity end and the same polarity end of the primary coil of the transformer, and the first square wave DC power supply and the second square wave DC power supply alternately become high level, The same polarity ends of the first secondary coil and the second secondary coil of the transformer are respectively connected to the input ends of the first backflow prevention clamp module and the second backflow prevention clamp module, the output ends of the first backflow prevention clamp module and the second backflow prevention clamp module are respectively connected to the gates of the first switching transistor and the second switching transistor, and the drains of the first switching transistor and the second switching transistor are connected to form a switching signal output end of the inverter switching circuit; The present invention discloses an inverter switching circuit in which the opposite polarity ends of the first secondary coil and the second secondary coil are both grounded, the clamp ends of the first backflow prevention clamp module and the second backflow prevention clamp module are both grounded, and the sources of the first switching transistor and the second switching transistor are both grounded.

[0006] Based on the above-mentioned solution, the present invention has been further improved as follows.

[0007] Furthermore, the first backflow prevention clamp module and the second backflow prevention clamp module have the same structure, and each includes a first diode, a third switching transistor, and a first resistor; a gate of the third switching transistor connected to the anode of the first diode, a source of the third switching transistor connected to the cathode of the first diode, and a drain of the third switching transistor connected to one end of the first resistor; The other end of the first resistor is the clamp end of the first backflow prevention clamp module or the second backflow prevention clamp module, the gate of the third switching transistor is the input end of the first backflow prevention clamp module or the second backflow prevention clamp module, and the source of the third switching transistor is the output end of the first backflow prevention clamp module or the second backflow prevention clamp module.

[0008] Furthermore, the inverse conversion switching circuit further includes a first RC filter module and a second RC filter module; a first RC filter module is connected in parallel between the same polarity end and the opposite polarity end of the first secondary coil; A second RC filter module is connected in parallel between the same polarity end and the opposite polarity end of the second secondary coil.

[0009] Furthermore, the first RC filter module and the second RC filter module have the same structure, and each includes a second resistor and a first capacitor; The same polarity end of the first secondary coil or the second secondary coil is connected to one end of the first capacitor, the other end of the first capacitor is connected to one end of the second resistor, and the other end of the second resistor is connected to the opposite polarity end of the first secondary coil or the second secondary coil.

[0010] Furthermore, the inverse conversion switching circuit further includes a first inversion circuit and a second inversion circuit; The first inverter circuit is connected in series with the opposite polarity end of the primary coil of the transformer, and the first square wave DC power supply is input to the opposite polarity end of the primary coil of the transformer through the first inverter circuit; The second inverter circuit is connected in series to the same polarity end of the primary coil of the transformer, and the second square wave DC power supply is input to the same polarity end of the primary coil of the transformer via the second inverter circuit.

[0011] Furthermore, the inverter switching circuit further includes a second capacitor, which is connected in series between the same polarity end of the primary coil of the transformer and the second inversion circuit, or between the opposite polarity end of the primary coil and the first inversion circuit.

[0012] In another aspect, the present invention provides a class E fixed frequency power amplifier parallel driving system for a high frequency power supply, comprising: a plurality of sets of the above-mentioned inverter switching circuits, an output capacitor, a balancing resistor, a first-order LC filter, a high frequency stabilizer, and a voltage stabilizing modulator; The switching signal output terminal of each pair of inverter switching circuits is connected to one end of each balancing resistor, and the other ends of all the balancing resistors are connected to a common center point, forming a star structure; The switching signal output terminal of each group of inverse conversion switching circuits is further connected to the input terminal of a corresponding first-order LC filter, and the output terminals of all the first-order LC filters are connected to form a combined output port, which is simultaneously connected to the voltage stabilization modulator and the high frequency stabilizer; The combined output port is a high-frequency signal output terminal of the system; The present invention further discloses a class E fixed frequency power amplifier parallel driving system for high frequency power supplies, characterized in that the voltage stabilization modulator is used to adjust the magnitude of the amplitude of the voltage input to the combined output port.

[0013] Based on the above-mentioned solution, the present invention further proposes the following improvements.

[0014] Additionally, the system further includes a plurality of sets of output capacitors; The switching signal output terminal of each set of inverse conversion switching circuits is further connected to ground after passing through the respective output capacitors.

[0015] Additionally, the system further includes a DC block, where: The combined output port is also connected to the input terminal of a DC block, and the output terminal of the DC block serves as the high-frequency signal output terminal of the system.

[0016] Additionally, the system further includes a high-order LC filter circuit, where: The combined output port is also connected to the input terminal of a high-order LC filter circuit, and the output terminal of the high-order LC filter circuit serves as the high-frequency signal output terminal of the system.

[0017] Additionally, the system further includes a high order LC filter circuit and a DC block, where: The combined output port is further connected to the input terminal of a high-order LC filter circuit, the output terminal of the high-order LC filter circuit is connected to the input terminal of a DC block, and the output terminal of the DC block is the high-frequency signal output terminal of the system.

[0018] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0019] In one aspect, the inverter switching circuit provided by the present invention limits the first and second square-wave DC power sources to alternately high levels, and includes a first backflow prevention clamp module and a second backflow prevention clamp module at the output ends of the first and second secondary coils of the transformer, and the drains of the first and second switching transistors are connected in parallel to enable high- and low-level switching at the switching signal output end of the inverter switching circuit, allowing the inverter switching circuit to maintain the switching performance of the switching transistors, thereby solving the problems of dynamic nonlinearity and gain imbalance that are common in conventional linear RF pulse power amplifiers. Furthermore, the first and second backflow prevention clamp modules prevent the push-pull transistor from burning out due to momentary high voltage caused by a coil short circuit, and prevent the coil from burning out due to high voltage caused by a reverse current impact on the coil, thereby solving the problems of transistor damage and electronic component explosion that are common in conventional push-pull inverters. In addition, the output potential and output power modulation of the switching signal output terminal of the inverse conversion switching circuit are determined by the potential change of the voltage Vbus on the DC BUS. Therefore, as long as the frequencies of the two input signals are stable, the frequency of the output AC signal will also be relatively stable, achieving the effect of modulating power at a fixed frequency, thereby meeting the requirement of adjusting power in a fixed frequency environment.

[0020] In another aspect, the class E fixed frequency power amplifier parallel drive system for high frequency power supply provided by the present invention is simple in design and, under the premise that the frequency is relatively constant, can be simply parallel-connected or combined to form a class E power amplifier by combining multiple sets of inverter switching circuits with a multi-order filter resonant topology to achieve the goal of increasing the power limit. Furthermore, the amplitude of the voltage input to the combined output port is adjusted by a voltage stabilization modulator to ensure the stability of the output power. Furthermore, by employing multiple sets of inverter switching circuits and combining them with the associated resonant topology, the output high frequency signal power is increased and the voltage is stabilized, effectively expanding the power range of the high frequency signal that can be provided by the class E fixed frequency power amplifier parallel drive system for high frequency power supply, thereby enriching its application scenarios.

[0021] In the present invention, the above technical solutions can be further combined with each other to realize more preferred combined solutions. Additional features and advantages of the present invention will be set forth hereinafter in the specification, and in part will be apparent from the specification or may be learned by practice of the invention. The objectives and other advantages of the present invention may be realized and obtained by means of the particular points pointed out in the specification and drawings. [Brief explanation of the drawings]

[0022] The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, and like reference numerals refer to like elements in all drawings. [Figure 1] 1 is a circuit diagram of an inverse conversion switching circuit provided by a first embodiment of the present invention; [Figure 2] 3 is a schematic diagram of control waveforms of a first switching transistor MOS1 and a second switching transistor MOS2 in the inverse conversion switching circuit provided by Example 1 of the present invention; FIG. [Figure 3] FIG. 2 is a circuit diagram of a class E fixed frequency power amplifier parallel driving system for high frequency power supply provided by embodiment 2 of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0023] Preferred embodiments of the present invention will now be described in detail with reference to the drawings, which constitute a part of this application and are intended to explain the principles of the present invention together with the embodiments of the present invention, but are not intended to limit the scope of the present invention.

[0024] A first specific embodiment of the present invention discloses a reverse conversion switching circuit, the circuit diagram of which is shown in FIG. 1 . The reverse conversion switching circuit includes a transformer, a first switching transistor MOS1, a second switching transistor MOS2, a first backflow prevention clamp module, and a second backflow prevention clamp module. The first square-wave DC power supply and the second square-wave DC power supply are respectively input to the opposite polarity end and the same polarity end of the primary coil of the transformer. The first square-wave DC power supply and the second square-wave DC power supply are alternately high level. The first secondary coil and the same polarity end of the second secondary coil of the transformer are respectively connected to the input terminals of the first backflow prevention clamp module and the second backflow prevention clamp module. The output terminals of the first backflow prevention clamp module and the second backflow prevention clamp module are respectively connected to the gates of the first switching transistor MOS1 and the second switching transistor MOS2, the drains of the first switching transistor MOS1 and the second switching transistor MOS2 are connected to form the switching signal output terminal of the inverter switching circuit, the opposite polarity terminals of the first secondary coil and the second secondary coil are both grounded, the clamp terminals of the first backflow prevention clamp module and the second backflow prevention clamp module are both grounded, and the sources of the first switching transistor MOS1 and the second switching transistor MOS2 are both grounded.

[0025] In this embodiment, the first switching transistor MOS1 and the second switching transistor MOS2 are both switching transistors. The first backflow prevention clamp module and the second backflow prevention clamp module have the same structure and each include a first diode, a third switching transistor (clamp transistor), and a first resistor (clamp resistor). The gate of the third switching transistor is connected to the anode of the first diode, the source of the third switching transistor is connected to the cathode of the first diode, the drain of the third switching transistor is connected to one end of the first resistor, and the other end of the first resistor is the clamp terminal of the first backflow prevention clamp module or the second backflow prevention clamp module. The gate of the third switching transistor is the input terminal of the first backflow prevention clamp module or the second backflow prevention clamp module, and the source of the third switching transistor is the output terminal of the first backflow prevention clamp module or the second backflow prevention clamp module. In FIG. 1, for the sake of distinction, the first diode, the third switching transistor, and the first resistor in the first backflow prevention clamp module are designated D1, MOS3, and R1, respectively. The first diode, the third switching transistor, and the first resistor in the second backflow prevention clamp module are denoted by D2, MOS4, and R4, respectively.

[0026] Preferably, the inverter switching circuit in this embodiment further includes a first RC filter module and a second RC filter module, where the first RC filter module is connected in parallel between the same-polarity and opposite-polarity ends of the first secondary coil, and the second RC filter module is connected in parallel between the same-polarity and opposite-polarity ends of the second secondary coil. Specifically, the first RC filter module and the second RC filter module have the same structure and each include a second resistor and a first capacitor, where the same-polarity end of the first or second secondary coil is connected to one end of the first capacitor, the other end of the first capacitor is connected to one end of the second resistor, and the other end of the second resistor is connected to the opposite-polarity end of the first or second secondary coil. For clarity, in FIG. 1, the second resistor and the first capacitor in the first RC filter module are designated R2 and C1, respectively. The second resistor and the first capacitor in the second RC filter module are designated R3 and C2, respectively.

[0027] Preferably, in order to prevent the signals of the first square-wave DC power source and the second square-wave DC power source from being too weak and unstable, the inverter switching circuit in this embodiment further includes a first inverter circuit and a second inverter circuit, wherein the first inverter circuit is connected in series with opposite polarity ends of the primary coil of the transformer, the first square-wave DC power source is input to the opposite polarity end of the primary coil of the transformer through the first inverter circuit, the second inverter circuit is connected in series with the same polarity end of the primary coil of the transformer, and the second square-wave DC power source is input to the same polarity end of the primary coil of the transformer through the second inverter circuit, so as to perform the initial same-phase stable amplification of the input signal.

[0028] Preferably, the inverter switching circuit in this embodiment further includes a second capacitor C3, which is connected in series between the same polarity end of the primary coil of the transformer and the second inverter circuit, or between the opposite polarity end of the primary coil and the first inverter circuit, thereby absorbing part of the energy of voltage fluctuations and making the voltage input to the primary winding of the transformer more stable.

[0029] In a specific implementation, the first switching transistor MOS1 and the second switching transistor MOS2 are NMOS transistors, and the third switching transistor is a PMOS transistor.

[0030] The operation process of the inverse conversion switching circuit provided in this embodiment will be described below.

[0031] In a specific implementation, the first and second square-wave DC power sources alternately go high, and the high-level ratio is determined according to the duty cycle. In some cases, the first and second square-wave DC power sources are strictly out of phase with each other. For convenience of explanation, in FIG. 1, the circuit formed by connecting the first secondary coil, the first switching transistor MOS1, the first backflow prevention clamp module, and the first RC filter module is referred to as a first set of circuits and is designated by reference numeral 1. The circuit formed by connecting the second secondary coil, the second switching transistor MOS2, the second backflow prevention clamp module, and the second RC filter module is referred to as a second set of circuits and is designated by reference numeral 2.

[0032] (1) The first square wave DC power supply is at a low level, and the second square wave DC power supply is at a high level. In this case, the current in the primary coil is 2->1, and the same polarity end of the secondary coil is the same, so the current direction in the secondary coil of the two sets of circuits is the same as that of the primary coil.

[0033] No effective potential is formed between the G and S electrodes of the clamp transistors in the two circuits, and both clamp transistors in the two circuits are turned off (i.e., MOS3 and MOS4 in FIG. 1 are both turned off). Effective potentials are formed across the G and S electrodes of the switching transistors in the two circuits, and both switching transistors in the two circuits are turned on (i.e., the first switching transistor MOS1 and the second switching transistor MOS2 are both turned on), so the secondary coils of the two circuits are approximately short-circuited, and the RC filter modules of the two circuits provide voltage-limiting and current-limiting buffer protection for the switching transistors when they are turned on.

[0034] When the first switching transistor MOS1 and the second switching transistor MOS2 are both turned on, the D electrodes of the first switching transistor MOS1 and the second switching transistor MOS2 are connected in parallel, so that in this case, the switching signal output terminal of the inverter switching circuit outputs a high-level signal.

[0035] (2) The first square wave DC power supply is at a high level, and the second square wave DC power supply is at a low level. In this case, the current in the primary coil is 1->2, and the same polarity end of the secondary coil is the same, so no effective potential is formed across the G and S electrodes of the switching transistors in both circuits, and both switching transistors in both circuits are off (i.e., the first switching transistor MOS1 and the second switching transistor MOS2 are both off). Effective potentials are formed across the G and S electrodes of the clamp transistors in both circuits, and both clamp transistors in both circuits are on. At the same time, the clamp resistors form current limiting protection, and the secondary coils of both circuits, the RC filter module, and the backflow prevention clamp module form an internal circulation circuit that does not interfere with the output.

[0036] In this case, the potential at the switching signal output terminal of the inverse conversion switching circuit corresponds to ground, zero potential, or a relatively low level signal.

[0037] For example, FIG. 2 shows a schematic diagram of the control waveforms of the first switching transistor MOS1 and the second switching transistor MOS2 in the inverter switching circuit. As can be seen from FIG. 2, the control waveforms of the first switching transistor MOS1 and the second switching transistor MOS2 are generally consistent except for slight variations at individual points. When the first switching transistor MOS1 and the second switching transistor MOS2 are both turned on, the switching signal output terminal of the inverter switching circuit outputs a high-level signal. When the first switching transistor MOS1 and the second switching transistor MOS2 are both turned off, the potential of the switching signal output terminal of the inverter switching circuit corresponds to ground, zero potential, or a relatively low-level signal. Therefore, two square-wave DC power sources with timing delay differences can generate a fixed-frequency AC signal with a relatively stable waveform.

[0038] In the circuit provided by this embodiment, the output potential and output power of the signal output terminal are modulated by the potential change of the voltage Vbus (see Figure 3) on the DC BUS. As long as the frequencies of the two input signals (the first square wave DC power supply and the second square wave DC power supply) are stable, the frequency of the output AC signal will also be relatively stable, thereby modulating the power at a fixed frequency.

[0039] A second specific embodiment of the present invention discloses a class E fixed frequency power amplifier parallel drive system for high frequency power supply, the circuit diagram of which is shown in Figure 3, and includes a plurality of inverter switching circuits according to the first embodiment, a balancing resistor, a first-order LC filter, a high frequency stabilizer, and a voltage stabilizing modulator, wherein the switching signal output terminal of each inverter switching circuit is connected to one end of each balancing resistor, and the other ends of all the balancing resistors are connected to a common center point (star) to form a star structure, the switching signal output terminal of each inverter switching circuit is also connected to the input terminal of the corresponding first-order LC filter, and the output terminals of all the first-order LC filters are connected to a combined output port, which is simultaneously connected to the voltage stabilizing modulator and the high frequency stabilizer, and which serves as the high frequency signal output terminal of the system, and the voltage stabilizing modulator is used to adjust the amplitude of the voltage input to the combined output port.

[0040] In a specific implementation, a corresponding voltage stabilization modulator, such as a buck buck modulator, a boost modulator, or a CUK modulator, can be selected according to the requirements of voltage stabilization modulation. The voltage stabilization modulator illustrated in Figure 3 is a buck buck modulator. Specifically, the buck buck modulator includes a buck switching transistor MOS5, an inductor L, a diode D, and a capacitor C0. The gate of the buck switching transistor MOS5 receives a duty cycle modulation signal, the drain of the buck switching transistor MOS5 is grounded via the capacitor C0, and the drain of the buck switching transistor MOS5 is also connected to a power supply Vdc. The source of the buck switching transistor MOS5 is respectively connected to one end of the inductor L and the cathode of the diode D, the anode of which is grounded, and the other end of the inductor L is connected to the combined output port. The buck buck modulator adjusts the amplitude of the voltage input to the combined output port according to the duty cycle modulation signal. In order to prevent the duty cycle adjustment signal from being too weak and unstable, the BUCK step-down modulator may further include a third inverter circuit. In this case, the input terminal of the third inverter circuit is used to receive the duty cycle modulation signal, and the output terminal of the third inverter circuit is connected to the gate of the BUCK switching transistor. In this embodiment, the BUCK switching transistor MOS5 is an NMOS transistor. The specific configuration of the BOOST step-up modulator or the CUK modulator may refer to the conventional configuration, and detailed description will be omitted.

[0041] Preferably, in order to ensure the output quality of the high frequency signal, this embodiment further provides the following optional optimization solution based on the above solution.

[0042] (1) The system also includes a DC block. In this case, the combined output port is also connected to the input terminal of a DC block, and the output terminal of the DC block is the high-frequency signal output terminal of the system. The DC component in the signal is separated by the DC block, optimizing the output quality of the high-frequency signal. For example, the DC block can be realized by a DC blocking capacitor C.

[0043] (2) The system further includes a high-order LC filter circuit. In this case, the combined output port is further connected to the input terminal of a high-order LC filter circuit, and the output terminal of the high-order LC filter circuit serves as the high-frequency signal output terminal of the system. The high-order LC filter circuit filters out high-order harmonics, effectively ensuring the quality of the output signal. For example, the high-order LC filter circuit is a second-order LC filter, or a second-order LC filter and a third-order LC filter connected in series.

[0044] (3) The system further includes a high-order LC filter circuit and a DC block. In this case, the combined output port is also connected to the input terminal of a high-order LC filter circuit, the output terminal of the high-order LC filter circuit is connected to the input terminal of a DC block, and the output terminal of the DC block is the high-frequency signal output terminal of the system. By combining the high-order LC filter circuit and the DC block, it is possible to filter out high-order harmonics in the signal and separate the DC component in the signal, thereby optimizing the output quality of the high-frequency signal.

[0045] In the specific implementation process, the above basic system design method or various preferred system design methods can be selected according to the high frequency signal output requirements of the actual application scenario.

[0046] The high-frequency power supply Class E fixed-frequency power amplifier parallel drive system provided by this embodiment employs a combination of multiple sets of inverter switching circuits and associated resonant topologies. An output capacitor and a balancing resistor are arranged at the output end of each inverter switching circuit, and after waveform shaping and filtering by a first-order LC filter, the signals of each set are output and combined in parallel or in the form of a combiner. This differs from existing push-pull power amplifiers in that the input point of the combined output port (i.e., the DC bus) is at the output end of the LC filter, which does not directly affect the switching transistor, and the output end of any order LC filter can be selected as the input point according to design requirements.

[0047] Taking Figure 3 as an example, the DC bus is taken into the output terminal of the first-order LC filtering, and the entire resonant topology works with the output of the inverse conversion switching circuit to provide high power output, and second-order and even third-order filters are used to optimize the waveform, and an RF stabilizer is used to prevent self-excitation of the entire power amplifier topology, and a DC block can also be used to limit the high-frequency signal output.

[0048] Furthermore, considering that the amplitude of the DC BUS directly affects the level of the output potential and the stability of the output power, a buck step-down modulator may be provided in the system, and by controlling the duty ratio of the buck switching transistor, the amplitude of the DC BUS taken into the power amplifier can be adjusted. In this example, the adjustable range of the DC BUS amplitude is 0 to Vdc.

[0049] In this embodiment, the output terminal of each inverter switching circuit is connected to an output capacitor to ensure signal stability at the output terminal. The output terminal of each inverter switching circuit is connected in parallel to a primary LC filter via a balancing resistor, limiting the current output from the signal output terminal to the primary LC filter in a shunt configuration. When the current from the switching signal output terminal of the inverter switching circuit passes through the balancing resistor, the resistance value fluctuates due to changes in the temperature of the component itself. Therefore, when connected in a star configuration, the actual balancing resistor at the output of each inverter switching circuit is dynamically adjusted. This dynamic adjustment is achieved by balancing the corresponding resistance value and current of each inverter switching circuit output, thereby achieving stable voltage and current at each output terminal and producing stable power output. In the above-mentioned high-frequency power supply class E fixed-frequency power amplifier parallel-drive system, a primary LC filter is used to shape and filter the output signal of the inverter switching circuit. The output terminals of all primary LC filters are connected in parallel or in the form of a combiner to combine the signal outputs of each group to form a combined output port. An RF stabilizer is used to calibrate the output level, thereby providing the high frequency signal output of the system.

[0050] It is understood by those skilled in the art that all or part of the processes for implementing the methods of the above embodiments can be completed by issuing instructions to relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium, such as a magnetic disk, an optical disk, a read-only memory, or a random-access memory.

[0051] The above are merely preferred specific embodiments of the present invention, and the protection scope of the present invention is not limited thereto. Any changes or replacements that are easily thought of by those skilled in the art within the technical scope described in the present invention are all included in the protection scope of the present invention.

Claims

1. a power inversion switching circuit, the power inversion switching circuit including: a transformer; a first switching transistor; a second switching transistor; a first backflow prevention clamp module; and a second backflow prevention clamp module; The first square wave DC power supply and the second square wave DC power supply are respectively input to the opposite polarity end and the same polarity end of the primary coil of the transformer, and the first square wave DC power supply and the second square wave DC power supply alternately become high level; the same polarity ends of the first secondary coil and the second secondary coil of the transformer are respectively connected to the input ends of the first backflow prevention clamp module and the second backflow prevention clamp module, the output ends of the first backflow prevention clamp module and the second backflow prevention clamp module are respectively connected to the gates of the first switching transistor and the second switching transistor, and the drains of the first switching transistor and the second switching transistor are connected to form a switching signal output end of the inverter switching circuit; an inverter switching circuit, characterized in that opposite polarity ends of the first secondary coil and the second secondary coil are both grounded, clamp ends of the first backflow prevention clamp module and the second backflow prevention clamp module are both grounded, and sources of the first switching transistor and the second switching transistor are both grounded.

2. the first backflow prevention clamp module and the second backflow prevention clamp module have the same structure, and each includes a first diode, a third switching transistor, and a first resistor; a gate of the third switching transistor connected to the anode of the first diode, a source of the third switching transistor connected to the cathode of the first diode, and a drain of the third switching transistor connected to one end of the first resistor; 2. The inverter switching circuit according to claim 1, wherein the other end of the first resistor is a clamp end of the first backflow prevention clamp module or the second backflow prevention clamp module, the gate of the third switching transistor is an input end of the first backflow prevention clamp module or the second backflow prevention clamp module, and the source of the third switching transistor is an output end of the first backflow prevention clamp module or the second backflow prevention clamp module.

3. further comprising a first RC filter module and a second RC filter module; a first RC filter module is connected in parallel between the same polarity end and the opposite polarity end of the first secondary coil; 3. The inverter switching circuit according to claim 2, wherein a second RC filter module is connected in parallel between the same polarity end and the opposite polarity end of the second secondary coil.

4. The first RC filter module and the second RC filter module have the same structure, and each includes a second resistor and a first capacitor; 4. The inverse conversion switching circuit of claim 3, wherein the same polarity end of the first secondary coil or the second secondary coil is connected to one end of the first capacitor, the other end of the first capacitor is connected to one end of the second resistor, and the other end of the second resistor is connected to the opposite polarity end of the first secondary coil or the second secondary coil.

5. further comprising a first inverting circuit and a second inverting circuit; The first inverter circuit is connected in series to the opposite polarity end of the primary coil of the transformer, and the first square wave DC power supply is input to the opposite polarity end of the primary coil of the transformer through the first inverter circuit; 5. The inverter switching circuit according to claim 1, wherein the second inverter circuit is connected in series to the same polarity end of the primary coil of the transformer, and the second square-wave DC power supply is input to the same polarity end of the primary coil of the transformer via the second inverter circuit.

6. 6. The inverter switching circuit according to claim 5, further comprising a second capacitor, the second capacitor being connected in series between the same polarity end of the primary coil of the transformer and the second inverting circuit, or the opposite polarity end of the primary coil and the first inverting circuit.

7. A class E fixed frequency power amplifier parallel driving system for a high frequency power supply, comprising: a plurality of sets of inverter switching circuits according to any one of claims 1 to 6; an output capacitor; a balancing resistor; a first-order LC filter; a high frequency stabilizer; and a voltage stabilizing modulator; The switching signal output terminal of each pair of inverter switching circuits is connected to one end of each of the balancing resistors, and the other ends of all the balancing resistors are connected to a common center point, forming a star structure; The switching signal output terminal of each group of inverse conversion switching circuits is further connected to the input terminal of a corresponding first-order LC filter, and the output terminals of all the first-order LC filters are connected to form a combined output port, which is simultaneously connected to the voltage stabilization modulator and the high frequency stabilizer; The combined output port is a high-frequency signal output terminal of the system; 10. A class E fixed frequency power amplifier parallel drive system for high frequency power sources, wherein the voltage stabilization modulator is used to adjust the magnitude of the amplitude of the voltage input to the combined output port.

8. further comprising a plurality of sets of output capacitors; 8. The high frequency power supply class E fixed frequency power amplifier parallel driving system according to claim 7, wherein the switching signal output terminal of each set of inverter switching circuits is further connected to ground after passing through each output capacitor.

9. Further comprising a DC block, where:

9. The high frequency power supply class E fixed frequency power amplifier parallel drive system according to claim 7 or 8, characterized in that the combined output port is also connected to the input end of the DC block, and the output end of the DC block is the high frequency signal output end of the system.

10. Further comprising a high order LC filter circuit, wherein:

9. The high frequency power supply class E fixed frequency power amplifier parallel drive system according to claim 7 or 8, characterized in that the combined output port is further connected to the input end of a high-order LC filter circuit, and the output end of the high-order LC filter circuit is the high frequency signal output end of the system.

11. Further comprising a high order LC filter circuit and a DC block, where:

9. The high frequency power supply class E fixed frequency power amplifier parallel drive system according to claim 7 or 8, characterized in that the combined output port is further connected to the input end of a high-order LC filter circuit, the output end of the high-order LC filter circuit is connected to the input end of a DC block, and the output end of the DC block is the high frequency signal output end of the system.

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