Inverse conversion switching circuit, Class E fixed frequency power amplifier parallel drive system for high-frequency power supply

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 frequencies, and particularly to an inverse conversion switching circuit, an E-class fixed frequency power amplification parallel drive system for a high frequency power supply.

Background Art

[0002] A conventional push-pull type inverter parallel connection output drive circuit utilizes the fixed frequency operation characteristics of the inverse conversion drive circuit, combines with a BUS to provide a certain DC, and forms a high frequency power output with high power at a fixed frequency due to the fixed frequency characteristics of the switching transistor inverse conversion circuit and the combined characteristics that can form power amplification in parallel connection.

[0003] The upper and lower ends of the output terminal of a push-pull type inverter are generally connected to the BUS potential, but are always restricted by the element performance of the switching transistor. If the voltage withstand of the push-pull switching transistor is insufficient, transistor breakdown and explosion of electronic components are likely to occur, and the circuit will be burned out.

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 an E-class fixed frequency power amplification parallel drive system for a high frequency power supply to solve the problem that transistor breakdown, explosion of electronic components, etc. are likely to occur in a conventional push-pull type inverter.

[0005] In one aspect, the present invention is an inverse conversion switching circuit, including a transformer, a first switching transistor, a second switching transistor, a first reverse current prevention clamp module, and a second reverse current prevention clamp module, A first square wave DC power supply and a second square wave DC power supply are respectively input to the opposite polarity ends and the same polarity ends of the primary coil of the transformer. 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 and second secondary coils of the transformer are connected to the input terminals of the first and second reverse current prevention clamp modules, respectively. The output terminals of the first and second reverse current prevention clamp modules are connected to the gates of the first and second switching transistors, respectively. The drains of the first and second switching transistors are connected to form the switching signal output terminals of the inverse conversion switching circuit. A reverse conversion switching circuit is disclosed, in which the opposite polarity terminals of the first and second secondary coils are both grounded, the clamp terminals of the first and second reverse current prevention clamp modules are both grounded, and the sources of the first and second switching transistors are both grounded.

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

[0007] Furthermore, the first reverse current prevention clamp module and the second reverse current prevention clamp module have the same structure and both include a first diode, a third switching transistor, and a first 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, and the drain of the third switching transistor is connected to one end of the first resistor. The other end of the first resistor is connected to the clamp terminal of the first or second reverse current prevention clamp module, the gate of the third switching transistor is connected to the input terminal of the first or second reverse current prevention clamp module, and the source of the third switching transistor is connected to the output terminal of the first or second reverse current 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 and opposite-polarity ends of the first secondary coil. A second RC filter module is connected in parallel between the same-polarity and opposite-polarity ends of the second secondary coil.

[0009] Furthermore, the first RC filter module and the second RC filter module have the same structure and both include a second resistor and a first capacitor. 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.

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

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

[0012] In another embodiment, the present invention relates to a Class E fixed-frequency power amplifier parallel drive system for a high-frequency power supply, comprising a plurality of the above-described inverse conversion switching circuits, an output capacitor, a balance resistor, a primary LC filter, a high-frequency stabilizer, and a voltage stabilization modulator, The switching signal output terminals of each set of inverse conversion switching circuits are connected to one end of their respective balance resistors, and the other ends of all balance resistors are connected to a single common center point, forming a star-shaped structure. The switching signal output terminals of each set of inverse conversion switching circuits are further connected to the input terminals of the corresponding primary LC filters, and the output terminals of all primary LC filters are connected to form a combined output port, which is simultaneously connected to the voltage stabilizer modulator and the high-frequency stabilizer. The aforementioned merging output port is used as the high-frequency signal output terminal of the system. Further disclosure is a Class E fixed-frequency power amplifier parallel drive system for a high-frequency power supply, characterized in that the voltage stabilization modulator is used to adjust the amplitude of the voltage taken into the combined output port.

[0013] Based on the above solution, the present invention has been further improved as follows.

[0014] Furthermore, the system further includes multiple sets of output capacitors, The switching signal output terminals of each pair of inverse conversion switching circuits are further grounded after passing through their respective output capacitors.

[0015] Furthermore, the system further includes a DC block, in this case, The aforementioned merged output port is further connected to the input terminal of the DC block, and the output terminal of the DC block serves as the high-frequency signal output terminal of the system.

[0016] Furthermore, the system further includes a higher-order LC filter circuit, in this case, The aforementioned combined output port is further connected to the input terminal of a higher-order LC filter circuit, and the output terminal of the higher-order LC filter circuit becomes the high-frequency signal output terminal of the system.

[0017] Furthermore, the system further includes a higher-order LC filter circuit and a DC block, in this case, The aforementioned combined output port is further connected to the input terminal of a higher-order LC filter circuit, the output terminal of the higher-order LC filter circuit is connected to the input terminal of a DC block, and the output terminal of the DC block is used as the high-frequency signal output terminal of the system.

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

[0019] In one respect, the inverse conversion switching circuit provided by the present invention restricts the first square wave DC power supply and the second square wave DC power supply to alternately reach high levels, provides a first reverse current prevention clamp module and a second reverse current prevention clamp module at the output terminals of the first and second secondary coils of the transformer, and connects the drains of the first and second switching transistors in parallel, thereby enabling high and low level switching at the switching signal output terminal of the inverse conversion switching circuit, and allowing the inverse conversion switching circuit to maintain the switching performance of the switching transistors, thereby effectively solving the problems of dynamic nonlinearity and gain imbalance that tend to occur in conventional linear RF pulse power amplifiers. Furthermore, the first and second reverse current prevention clamp modules prevent the push-pull transistors from burning out due to instantaneous high voltage caused by coil short circuits, and also prevent the coils from burning out at high voltage due to the impact of reverse current on the coils, thereby effectively solving the problems of transistor failure and explosion of electronic components that tend to occur in conventional push-pull inverters. Furthermore, since the modulation of the output potential and output power at the switching signal output terminal of the inverse conversion switching circuit is determined by the potential change of the voltage Vbus in the DC BUS, 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 the power at a fixed frequency, thereby satisfying the requirement of adjusting power in a fixed frequency environment.

[0020] In another aspect, the Class-E fixed-frequency power amplification parallel drive system of the high-frequency power supply provided by the present invention has a simple design. On the premise that the frequency is relatively constant, a plurality of sets of inverse conversion switching circuits are combined with the resonance topology of the multi-stage filter by simple parallel connection or synthesis to form Class-E power amplification, and the purpose of raising the upper limit of power can be achieved. Further, the magnitude of the amplitude of the voltage captured by the combined output port is adjusted by a voltage stabilization modulator to ensure the stability of the output power. Further, by adopting a plurality of sets of inverse conversion switching circuits and combining them with the related resonance topology, the power of the output high-frequency signal is increased, the voltage is made constant, the power range of the high-frequency signal that can be provided by the Class-E fixed-frequency power amplification parallel drive system of the high-frequency power supply is effectively expanded, and its application scenarios are enriched.

[0021] In the present invention, the above technical solution means can be further combined with each other to realize more preferred combined solution means. Other features and advantages of the present invention are described later in the specification, and some of the advantages can be clarified from the specification or grasped by the implementation of the present invention. The object and other advantages of the present invention can be realized and obtained from the content specifically pointed out in the specification and drawings.

Brief Description of the Drawings

[0022] The drawings are only for showing specific embodiments and should not be construed as limiting the present invention. In all the drawings, the same reference numerals denote the same members. [Figure 1] It is a circuit diagram of the inverse conversion switching circuit provided by Embodiment 1 of the present invention. [Figure 2] It is a schematic diagram of the control waveforms of the first switching transistor MOS1 and the second switching transistor MOS2 in the inverse conversion switching circuit provided by Embodiment 1 of the present invention. [Figure 3] It is a circuit diagram of the Class-E fixed-frequency power amplification parallel drive system of the high-frequency power supply provided by Embodiment 2 of the present invention.

Modes for Carrying Out the Invention

[0023] Preferred embodiments of the present invention will be described below with reference to the drawings, which constitute part of this application and are intended to interpret the principles of the present invention together with the embodiments, and are not intended to limit the scope of the present invention.

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

[0025] In this embodiment, both the first switching transistor MOS1 and the second switching transistor MOS2 are switching transistors. The first reverse current prevention clamp module and the second reverse current prevention clamp module have the same structure and both include a first diode, a third switching transistor (clamp transistor), and a first resistor (clamp resistor). Here, 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, the other end of the first resistor is the clamp terminal of the first reverse current prevention clamp module or the second reverse current prevention clamp module, the gate of the third switching transistor is the input terminal of the first reverse current prevention clamp module or the second reverse current prevention clamp module, and the source of the third switching transistor is the output terminal of the first reverse current prevention clamp module or the second reverse current prevention clamp module. In Figure 1, for distinction, the first diode, the third switching transistor, and the first resistor in the first reverse current prevention clamp module are denoted by symbols D1, MOS3, and R1, respectively. In the second reverse current prevention clamp module, the first diode, the third switching transistor, and the first resistor are denoted by symbols D2, MOS4, and R4, respectively.

[0026] Preferably, the inverse conversion 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 and second RC filter modules have the same structure and both 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. In Figure 1, for distinction, the second resistor and first capacitor in the first RC filter module are denoted as R2 and C1, respectively. The second resistor and first capacitor in the second RC filter module are denoted as R3 and C2, respectively.

[0027] Preferably, in order to avoid the signals of the first square wave DC power supply and the second square wave DC power supply being excessively weak and unstable, the inverse conversion switching circuit in this embodiment further includes a first inverting circuit and a second inverting circuit, where the first inverting circuit is connected in series to the opposite polarity terminals of the primary coil of the transformer, and the first square wave DC power supply is input to the opposite polarity terminals of the primary coil of the transformer via the first inverting circuit; the second inverting circuit is connected in series to the same polarity terminals of the primary coil of the transformer, and the second square wave DC power supply is input to the same polarity terminals of the primary coil of the transformer via the second inverting circuit to perform initial in-phase stable amplification of the input signal.

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

[0029] Furthermore, in the specific implementation process, NMOS transistors are used as the first switching transistor MOS1 and the second switching transistor MOS2, and a PMOS transistor is used as the third switching transistor.

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

[0031] In the specific implementation process, it should be noted that the first square wave DC power supply and the second square wave DC power supply alternately reach high levels, and the proportion of high levels is determined according to the duty cycle. In some cases, the first square wave DC power supply and the second square wave DC power supply are strictly out of phase with each other. Also, for the sake of explanation, in Figure 1, the circuit formed by connecting the first secondary coil, the first switching transistor MOS1, the first reverse current prevention clamp module, and the first RC filter module is referred to as the first set of circuits and is denoted by reference numeral 1. The circuit formed by connecting the second secondary coil, the second switching transistor MOS2, the second reverse current prevention clamp module, and the second RC filter module is referred to as the second set of circuits and is denoted 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 since the same polarity terminals of the secondary coils are the same, the current direction in the secondary coils 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 sets of circuits, so both clamp transistors in the two sets of circuits are turned off (i.e., MOS3 and MOS4 in Figure 1 are both turned off). An effective potential is formed across both the G and S electrodes of the switching transistors in the two sets of circuits, so both switching transistors in the two sets of circuits are turned on (i.e., the first switching transistor MOS1 and the second switching transistor MOS2 are both turned on), the secondary coils of the two sets of circuits are almost equivalent to a short-circuit path, and the RC filter modules of the two sets of circuits provide buffer protection by limiting voltage and current against the turning on of the switching transistors.

[0034] When both the first switching transistor MOS1 and the second switching transistor MOS2 are turned on, the D electrodes of the first switching transistor MOS1 and the second switching transistor MOS2 are connected in parallel. In this case, the switching signal output terminal of the inverse conversion 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 terminals of the secondary coil are the same. Therefore, no effective potential is formed across the G and S electrodes of the switching transistors in both sets of circuits, and both switching transistors in both sets of circuits turn off (i.e., both the first switching transistor MOS1 and the second switching transistor MOS2 turn off). An effective potential is formed across the G and S electrodes of the clamp transistors in both sets of circuits, and both clamp transistors in both sets of circuits turn on. At the same time, the clamp resistors form current limiting protection, and the secondary coils, RC filter modules, and reverse current prevention clamp modules of the two sets of circuits 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 illustrative purposes, a schematic diagram of the control waveforms of the first switching transistor MOS1 and the second switching transistor MOS2 in an inverse conversion switching circuit is shown in Figure 2. As can be seen from Figure 2, the control waveforms of the first switching transistor MOS1 and the second switching transistor MOS2 are generally identical, with only slight variations in individual points. When both the first switching transistor MOS1 and the second switching transistor MOS2 are on, the switching signal output terminal of the inverse conversion switching circuit outputs a high-level signal. When both the first switching transistor MOS1 and the second switching transistor MOS2 are off, 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. Therefore, a fixed-frequency AC signal with a relatively stable waveform can be generated using two square-wave DC power supplies with a timing delay difference.

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

[0039] A specific embodiment 2 of the present invention discloses a Class E fixed-frequency power amplifier parallel drive system for a high-frequency power supply. The circuit diagram of the system is shown in Figure 3, and the system includes multiple sets of inverse conversion switching circuits described in Embodiment 1, balance resistors, primary LC filters, a high-frequency stabilizer, and a voltage stabilizer modulator, where the switching signal output terminal of each set of inverse conversion switching circuits is connected to one end of each balance resistor, and the other ends of all balance resistors are connected to one common center point (star), forming a star-shaped structure. The switching signal output terminal of each set of inverse conversion switching circuits is further connected to the input terminal of the corresponding primary LC filter, and the output terminals of all primary LC filters are connected to form a combined output port, which is simultaneously connected to the voltage stabilizer modulator and the high-frequency stabilizer, and the combined output port is the high-frequency signal output terminal of the system, where the voltage stabilizer modulator is used to adjust the amplitude of the voltage taken into the combined output port.

[0040] In the specific implementation process, a voltage stabilization modulator, such as a buck modulator, boost modulator, or CUK modulator, can be selected according to the requirements of voltage stabilization modulation. The voltage stabilization modulator illustrated in Figure 3 is a buck modulator. Specifically, the buck modulator includes a buck switching transistor MOS5, an inductor L, a diode D, and a capacitor C0. Here, the gate of the buck switching transistor MOS5 is used to receive the 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 the power supply Vdc. The source of the buck switching transistor MOS5 is connected to one end of the inductor L and the cathode of the diode D, respectively, the anode of the diode D is grounded, and the other end of the inductor L is connected to the merge output port. The buck modulator adjusts the amplitude of the voltage taken into the merge output port based on the duty cycle modulation signal. Furthermore, to avoid the duty cycle adjustment signal becoming excessively weak and unstable, the BUCK buck modulator may also include a third inverting circuit. In this case, the input terminal of the third inverting circuit is used to receive the duty cycle modulation signal, and the output terminal of the third inverting circuit is connected to the gate of the BUCK switching transistor. In this embodiment, the BUCK switching transistor MOS5 is an NMOS transistor. Specific forms of the BOOST boost modulator or CUK modulator can be found in reference to conventional forms, and a detailed explanation is omitted.

[0041] Preferably, in order to ensure the output quality of high-frequency signals, this embodiment further provides the following selective optimization solutions based on the above solutions.

[0042] (1) The system further includes a DC block In this case, the combined output port is further connected to the input terminal of a DC block, and the output terminal of the DC block becomes the high-frequency signal output terminal of the system. By separating the DC component in the signal with the DC block, the output quality of the high-frequency signal is optimized. Exemplarily, the DC block can be realized by a DC block capacitor C.

[0043] (2) The system further includes a higher-order LC filter circuit In this case, the combined output port is further connected to the input terminal of a higher-order LC filter circuit, and the output terminal of the higher-order LC filter circuit becomes the high-frequency signal output terminal of the system. By filtering and removing higher harmonics with the higher-order LC filter circuit, the quality of the output signal is effectively guaranteed. Exemplaryly, the higher-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 in sequence.

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

[0045] In the specific implementation process, the above-mentioned basic system design method or various other preferred system design methods can be selected according to the output requirements of high-frequency signals in actual application scenarios.

[0046] In the Class E fixed-frequency power amplifier parallel drive system for high-frequency power supplies provided by this embodiment, a combination of multiple sets of inverse switching circuits and associated resonant topologies is employed. Output capacitors and balance resistors are placed at the output terminals of each set of inverse switching circuits, and after waveform shaping and filtering by a first-order LC filter, the signals from each set are output and merged in the form of parallel connection or a combiner. This differs from existing push-pull power amplifiers in that the input point of the merged output port (i.e., DC BUS) is at the output terminal of the LC filter, does not directly act on the switching transistor, and the output terminal of any order of LC filter can be selected as the input point according to the design requirements.

[0047] Taking Figure 3 as an example, the DC bus is incorporated into the output terminal of the primary LC filter, and the entire resonant topology interacts with the output of the inverse conversion switching circuit to provide high power output. Furthermore, the waveform is optimized by secondary and even tertiary filters, and the entire power amplification topology is prevented from becoming self-excited by an RF stabilizer. In addition, the high-frequency signal output can be limited by a DC block.

[0048] Furthermore, considering that the amplitude of the DC bus directly affects the output potential and the stability of the output power, a buck modulator may be provided in the system. By controlling the duty cycle of the buck switching transistor, the amplitude of the DC bus incorporated into the power amplifier can be adjusted. In this example, the adjustable range of the DC bus amplitude is 0 to Vdc.

[0049] Furthermore, in this embodiment, the output terminals of each pair of inverse conversion switching circuits are connected to output capacitors to ensure signal stability at the output terminals. Additionally, the output terminals of each pair of inverse conversion switching circuits are connected in parallel to a primary LC filter via balance resistors, limiting the current output from the signal output terminals to the primary LC filter in a shunt configuration. Moreover, when the current at the switching signal output terminal of the inverse conversion switching circuit passes through the balance resistor, temperature changes in the component itself affect the fluctuation of the resistance value. Therefore, when connected in a star configuration, the actual balance resistors of the outputs of each pair of inverse conversion switching circuits form a dynamic adjustment. This dynamic adjustment is due to the balance between the corresponding resistance values ​​and currents of the outputs of each pair of inverse conversion switching circuits. As a result, the voltage and current at each output terminal form a stable voltage and current due to this balance, resulting in a stable power output. In the above-described Class E fixed-frequency power amplifier parallel drive system for high-frequency power supplies, the primary LC filters perform waveform shaping and filtering of the output signals of the inverse conversion switching circuits. Furthermore, the output terminals of all primary LC filters are connected in parallel or in a combiner configuration to merge the signal outputs of each pair, forming a combined output port. The output level is calibrated using an RF stabilizer, thereby obtaining the high-frequency signal output of the above system.

[0050] Those skilled in the art will understand that all or part of the process for implementing the method of the above embodiment can be completed by issuing instructions to the relevant hardware via a computer program, and that the program can be stored in a computer-readable storage medium, where the computer-readable storage medium is a magnetic disk, an optical disk, a read-only memory, or a random-access memory, etc.

[0051] The foregoing are merely preferred specific embodiments of the present invention, and the scope of protection of the present invention is not limited thereto. Any changes or substitutions that are readily conceivable to those skilled in the art within the scope of the present invention are all included within the scope of protection of the present invention.

Claims

1. A reverse conversion switching circuit comprising a transformer, a first switching transistor, a second switching transistor, a first reverse current prevention clamp module, and a second reverse current prevention clamp module, The first square wave DC power supply and the second square wave DC power supply are input to the opposite polarity terminal and the same polarity terminal of the primary coil of the transformer, respectively, and the first and second square wave DC power supplies alternately reach high levels. The same polarity ends of the first and second secondary coils of the transformer are connected to the input terminals of the first and second reverse current prevention clamp modules, respectively. The output terminals of the first and second reverse current prevention clamp modules are connected to the gates of the first and second switching transistors, respectively. The drains of the first and second switching transistors are connected to form the switching signal output terminals of the inverse conversion switching circuit. An inverse switching circuit characterized in that both opposite polarity terminals of the first and second secondary coils are grounded, both clamp terminals of the first and second reverse current prevention clamp modules are grounded, and both sources of the first and second switching transistors are grounded.

2. The first reverse current prevention clamp module and the second reverse current prevention clamp module have the same structure and both include a first diode, a third switching transistor, and a first 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, and the drain of the third switching transistor is connected to one end of the first resistor. The inverse conversion switching circuit according to claim 1, characterized in that the other end of the first resistor is the clamp terminal of the first reverse current prevention clamp module or the second reverse current prevention clamp module, the gate of the third switching transistor is the input terminal of the first reverse current prevention clamp module or the second reverse current prevention clamp module, and the source of the third switching transistor is the output terminal of the first reverse current prevention clamp module or the second reverse current prevention clamp module.

3. Further including 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. The inverse conversion switching circuit according to claim 2, characterized in that 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 both include a second resistor and a first capacitor. The inverse conversion switching circuit according to claim 3, characterized in that 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. The invention further includes a first inverting circuit and a second inverting circuit, The first inverting circuit is connected in series to the opposite polarity terminals of the transformer's primary coil, and the first square wave DC power supply is input to the opposite polarity terminals of the transformer's primary coil via the first inverting circuit. The inverse transformer switching circuit according to any one of claims 1 to 4, characterized in that the second inverting circuit is connected in series with the same polarity terminals of the primary coil of the transformer, and the second square wave DC power supply is input to the same polarity terminals of the primary coil of the transformer via the second inverting circuit.

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

7. A Class E fixed-frequency power amplifier parallel drive system for a high-frequency power supply, comprising a plurality of sets of inverse conversion switching circuits according to claim 1, an output capacitor, a balance resistor, a primary LC filter, a high-frequency stabilizer, and a voltage stabilization modulator, The switching signal output terminals of each set of inverse conversion switching circuits are connected to one end of their respective balance resistors, and the other ends of all the balance resistors are connected to a single common center point, forming a star-shaped structure. The switching signal output terminals of each set of inverse conversion switching circuits are further connected to the input terminals of the corresponding primary LC filters, and the output terminals of all primary LC filters are connected to form a combined output port, which is simultaneously connected to the voltage stabilizer modulator and the high-frequency stabilizer. The aforementioned merging output port is used as the high-frequency signal output terminal of the system. A Class E fixed-frequency power amplifier parallel drive system for a high-frequency power supply, characterized in that the voltage stabilization modulator is used to adjust the amplitude of the voltage taken into the combined output port.

8. It further includes multiple sets of output capacitors, The Class E fixed-frequency power amplifier parallel drive system for a high-frequency power supply according to claim 7, characterized in that the switching signal output terminals of each set of inverse conversion switching circuits are further grounded after passing through their respective output capacitors.

9. Further including a DC block, in this case, The Class E fixed-frequency power amplifier parallel drive system for a high-frequency power supply according to claim 7 or 8, characterized in that the merged output port is further 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.

10. The higher-order LC filter circuit further includes, in this case, The Class E fixed-frequency power amplifier parallel drive system for a high-frequency power supply according to claim 7 or 8, characterized in that the combined output port is further connected to the input terminal of a higher-order LC filter circuit, and the output terminal of the higher-order LC filter circuit is the high-frequency signal output terminal of the system.

11. The system further includes a higher-order LC filter circuit and a DC block, in which case, The Class E fixed-frequency power amplifier parallel drive system for a high-frequency power supply according to claim 7 or 8, characterized in that the combined output port is further connected to the input terminal of a higher-order LC filter circuit, the output terminal of the higher-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.

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