Resonant soft-switching inverter circuit, system and method

Abstract

The present invention provides a resonant soft-switching inverter circuit, system, and method, wherein a capacitor module is connected to the positive and negative electrodes of a power supply; two input terminals of an H-bridge inverter module are connected to the capacitor module; a first terminal and a second terminal of the resonant module are connected to the first and second output terminals of the H-bridge inverter module; a third terminal of the resonant module is connected to the second input terminal of the H-bridge inverter module; and a fourth terminal and a fifth terminal of the resonant module are connected to a load; the resonant module controls the charging and discharging states of the first capacitor in the resonant module, so that each switch tube is at zero voltage or zero current when turned on, and at zero voltage or zero current when turned off. The circuit can achieve, through the resonant module, that each switch tube in the H-bridge inverter module is at zero voltage or zero current when turned on, and at zero voltage or zero current when turned off, thereby fundamentally solving the problem of loss of the switch tube when turned on or off, thereby improving the efficiency, stability, and reliability of the circuit.

Description

Technical Field

[0001] The present invention relates to the technical field of power electronic circuits, and in particular to a resonant soft-switching inverter circuit, system and method. Background Art

[0002] In existing H-bridge inverter circuits, when the two pairs of bridge arms are turned on or off, the presence of MOSFET parasitic capacitance will cause the two pairs of bridge arms to be slightly conductive. For example, when the MOSFET is turned off, the voltage gradually increases and the current gradually decreases. During the time interval where the voltage and current intersect, the corresponding power can be calculated. In mild cases, this leads to increased losses and reduced efficiency. In severe cases, it may cause the MOSFET to burn out, greatly reducing the stability and reliability of the H-bridge inverter circuit. Summary of the Invention

[0003] The object of the present invention is to provide a resonant soft-switching inverter circuit, system and method to improve the efficiency, stability and reliability of the inverter circuit.

[0004] The present invention provides a resonant soft-switching inverter circuit, which includes: a capacitor module having a first end and a second end; the first end of the capacitor module is connected to the positive electrode of a power supply, and the second end of the capacitor module is connected to the negative electrode of the power supply; an H-bridge inverter module having a first input end, a second input end, a first output end, and a second output end; the first input end of the H-bridge inverter module is connected to the first end of the capacitor module, and the second input end of the H-bridge inverter module is connected to the second end of the capacitor module; a resonance module having a first end, a second end, a third end, a fourth end, and a fifth end; the first end of the resonance module is connected to the first output end of the H-bridge inverter module, the second end of the resonance module is connected to the second output end of the H-bridge inverter module, the third end of the resonance module is connected to the second input end of the H-bridge inverter module, and a load is connected between the fourth end and the fifth end of the resonance module; the resonance module is used to control the charging state and discharging state of a first capacitor in the resonance module, so that each switch tube in the H-bridge inverter module is zero-voltage on-state or zero-current on-state when turned on, and is zero-voltage off-state or zero-current off-state when turned off.

[0005] Furthermore, the resonant module includes: a first switching tube having a gate, a source and a drain, the drain of the first switching tube being connected to the first output terminal of the H-bridge inverter module; a first resistor having a first end and a second end, the first end of the first resistor being connected to the source of the first switching tube, and the second end of the first resistor being connected to the gate of the first switching tube; a second resistor having a first end and a second end, the first end of the second resistor being connected to the gate of the first switching tube, and the second end of the second resistor being connected to the first control signal; a second switching tube having a gate, a source and a drain, the drain of the second switching tube being connected to the second output terminal of the H-bridge inverter module; a third resistor having a first end and a second end, the first end of the third resistor being connected to the source of the second switching tube, and the second end of the third resistor being connected to the gate of the second switching tube; a fourth resistor having a first end and a second end, the first end of the fourth resistor being connected to the gate of the second switching tube, and the second end of the fourth resistor being connected receive a second control signal; a first diode is configured such that the anode of the first diode is connected to the second input terminal of the H-bridge inverter module, and the cathode of the first diode is connected to the first end of the first resistor; a second diode is configured such that the anode of the second diode is connected to the second input terminal of the H-bridge inverter module, and the cathode of the second diode is connected to the first end of the third resistor; a first capacitor has a first end and a second end, the first end of the first capacitor is connected to the cathode of the first diode, and the second end of the first capacitor is connected to the cathode of the second diode; a second capacitor has a first end and a second end, the first end of the second capacitor is respectively connected to the first output terminal of the H-bridge inverter module and the fourth end of the resonance module, and the second end of the second capacitor is connected to the fifth end of the resonance module; a first inductor has a first end and a second end, the first end of the first inductor is connected to the second end of the second capacitor, and the second end of the first inductor is connected to the second output terminal of the H-bridge inverter module.

[0006] Furthermore, the capacitor module includes: a third capacitor, having a first end and a second end, the first end of the third capacitor is connected to the positive pole of the power supply, and the second end of the third capacitor is connected to the negative pole of the power supply; a fourth capacitor, having a first end and a second end, the first end of the fourth capacitor is connected to the positive pole of the power supply, and the second end of the fourth capacitor is connected to the negative pole of the power supply.

[0007] Furthermore, the H-bridge inverter module includes: a third switch tube and a first drive module connected to the third switch tube; a fourth switch tube and a second drive module connected to the fourth switch tube; the fourth switch tube and the third switch tube are complementary conductive; a fifth switch tube and the third drive module connected to the fifth switch tube; a sixth switch tube and the fourth drive module connected to the sixth switch tube; the sixth switch tube and the fifth switch tube are complementary conductive; wherein, the third switch tube and the fourth switch tube are coupled in series between the positive pole and the negative pole of the power supply, the fifth switch tube and the sixth switch tube are coupled in series between the positive pole and the negative pole of the power supply, the common end of the third switch tube and the fourth switch tube constitutes the first output end of the H-bridge inverter module, and the common end of the fifth switch tube and the sixth switch tube constitutes the second output end of the H-bridge inverter module.

[0008] Furthermore, the first switching tube, the second switching tube, the third switching tube, the fourth switching tube, the fifth switching tube and the sixth switching tube all have parasitic diodes.

[0009] Furthermore, the first driving module includes: a fifth resistor having a first end and a second end, the first end of the fifth resistor being connected to the gate of the third switching tube; a sixth resistor having a first end and a second end, the first end of the sixth resistor being connected to the gate of the third switching tube; a seventh resistor having a first end and a second end, the first end of the seventh resistor being connected to the gate of the third switching tube, and the second end of the seventh resistor being connected to the source of the third switching tube; a third diode being configured such that the anode of the third diode is connected to the second end of the fifth resistor; the cathode of the third diode is connected to the second end of the sixth resistor, and the cathode of the third diode is also connected to the first driving signal;

[0010] The second driving module includes: an eighth resistor having a first end and a second end, the first end of the eighth resistor being connected to the gate of the fourth switching transistor; a ninth resistor having a first end and a second end, the first end of the ninth resistor being connected to the gate of the fourth switching transistor; a tenth resistor having a first end and a second end, the first end of the tenth resistor being connected to the gate of the fourth switching transistor, and the second end of the tenth resistor being connected to the source of the fourth switching transistor; and a fourth diode being configured such that an anode of the fourth diode is connected to the second end of the eighth resistor; a cathode of the fourth diode is connected to the second end of the ninth resistor, and the cathode of the fourth diode is further connected to the second driving signal;

[0011] The third driving module includes: an eleventh resistor having a first end and a second end, the first end of the eleventh resistor being connected to the gate of the fifth switching transistor; a twelfth resistor having a first end and a second end, the first end of the twelfth resistor being connected to the gate of the fifth switching transistor; a thirteenth resistor having a first end and a second end, the first end of the thirteenth resistor being connected to the gate of the fifth switching transistor, and the second end of the thirteenth resistor being connected to the source of the fifth switching transistor; and a fifth diode being configured such that an anode of the fifth diode is connected to the second end of the eleventh resistor; a cathode of the fifth diode is connected to the second end of the twelfth resistor, and the cathode of the fifth diode is further connected to the third driving signal;

[0012] The fourth driving module includes: a fourteenth resistor having a first end and a second end, the first end of the fourteenth resistor being connected to the gate of the sixth switching tube; a fifteenth resistor having a first end and a second end, the first end of the fifteenth resistor being connected to the gate of the sixth switching tube; a sixteenth resistor having a first end and a second end, the first end of the sixteenth resistor being connected to the gate of the sixth switching tube, and the second end of the thirteenth resistor being connected to the source of the sixth switching tube; a sixth diode being configured such that the anode of the sixth diode is connected to the second end of the fifteenth resistor; the cathode of the sixth diode is connected to the second end of the fourteenth resistor, and the cathode of the sixth diode is also connected to the fourth driving signal.

[0013] The present invention provides a resonant soft-switching inverter system, comprising: any one of the above-mentioned resonant soft-switching inverter circuits.

[0014] Furthermore, the system also includes: a first control module, a second control module, a third control module, a fourth control module, a fifth control module, and a sixth control module; the first control module, the second control module, the third control module, the fourth control module, the fifth control module, and the sixth control module are respectively connected to the resonant soft-switching inverter circuit; the first control module is used to output a first control signal for the resonant soft-switching inverter circuit; the second control module is used to output a second control signal for the resonant soft-switching inverter circuit; the third control module is used to output a first drive signal for the resonant soft-switching inverter circuit; the fourth control module is used to output a second drive signal for the resonant soft-switching inverter circuit; the fifth control module is used to output a third drive signal for the resonant soft-switching inverter circuit; and the sixth control module is used to output a fourth drive signal for the resonant soft-switching inverter circuit.

[0015] The present invention provides a control method for a resonant soft-switching inverter circuit, which is applied to any of the resonant soft-switching inverter circuits described above. The method includes: in a first control cycle, after a power supply is connected to the resonant soft-switching inverter circuit, controlling the sixth switch tube and the second switch tube in the resonant soft-switching inverter circuit to be turned on; wherein the voltage across the first capacitor in the resonant soft-switching inverter circuit is zero, so that the sixth switch tube and the second switch tube are both turned on at zero voltage; controlling the third switch tube in the resonant soft-switching inverter circuit to be turned on, wherein at the moment the third switch tube is turned on, the current flowing through the third switch tube is zero, so that the third switch tube is turned on at zero current; controlling the first switch tube in the resonant soft-switching inverter circuit to be turned on so that the first capacitor is fully charged by the power supply; controlling the third switch tube to be turned off so that the first capacitor is discharged through the first loop; wherein the voltage between the drain and source of the third switch tube is zero, so that the third switch tube is turned off at zero voltage; and A first circuit is a circuit consisting of a first capacitor, a parasitic diode of a first switching tube, a second capacitor, a first inductor, a sixth switching tube, and a second diode in a resonant soft-switching inverter circuit. When the first capacitor is completely discharged, the fourth switching tube in the resonant soft-switching inverter circuit is controlled to be turned on. The voltage between the drain and source of the fourth switching tube is zero, so that the fourth switching tube is turned on at zero voltage. The first switching tube is controlled to be turned off, and the sixth switching tube is controlled to be turned off. The voltage between the drain and source of the sixth switching tube is zero, so that the sixth switching tube is turned off at zero voltage. The first inductor charges the first capacitor through a second circuit. The second circuit is a circuit consisting of the first inductor, the second switching tube, the first capacitor, the parasitic diode of the first switching tube, and the second capacitor. After the first capacitor is fully charged, the fifth switching tube in the resonant soft-switching inverter circuit is controlled to be turned on. The voltage between the drain and source of the fifth switching tube is zero, so that the fifth switching tube is turned on at zero voltage.

[0016] Furthermore, the method also includes: in each subsequent control cycle, according to the charging state and discharging state of the first capacitor, controlling the turn-on sequence and turn-off sequence of the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube, so that the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube are turned on with zero voltage or zero current when turned on, and are turned off with zero voltage or zero current when turned off.

[0017] The present invention provides a resonant soft-switching inverter circuit, system, and method, wherein the circuit comprises: a capacitor module having a first end and a second end; the first end of the capacitor module is connected to the positive electrode of the power supply, and the second end of the capacitor module is connected to the negative electrode of the power supply; an H-bridge inverter module having a first input end, a second input end, a first output end, and a second output end; the first input end of the H-bridge inverter module is connected to the first end of the capacitor module, and the second input end of the H-bridge inverter module is connected to the second end of the capacitor module; a resonant module having a first end, a second end, a third end, and a fourth end. and the fifth end; the first end of the resonant module is connected to the first output end of the H-bridge inverter module, the second end of the resonant module is connected to the second output end of the H-bridge inverter module, the third end of the resonant module is connected to the second input end of the H-bridge inverter module, and a load is connected between the fourth end of the resonant module and the fifth end of the resonant module; the resonant module is used to control the charging state and discharging state of the first capacitor in the resonant module, so that each switch tube in the H-bridge inverter module is zero voltage on or zero current on when turned on, and zero voltage off or zero current off when turned off. This circuit can achieve zero voltage on or zero current on for each switch tube in the H-bridge inverter module through the resonant module, and zero voltage off or zero current off when turned off, thereby fundamentally solving the loss problem of the switch tube when turning on or off, thereby improving the efficiency, stability and reliability of the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A schematic diagram of a conventional inverter topology circuit in the related art;

[0020] Figure 2 A schematic structural diagram of a resonant soft-switching inverter circuit provided by an embodiment of the present invention;

[0021] Figure 3 A schematic diagram of a circuit topology structure provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] like Figure 1 The schematic diagram of a traditional inverter topology circuit in the related art shown in the figure, wherein the switch tube Q1, the switch tube Q2, the switch tube Q3 and the switch tube Q4 form a full-bridge circuit, the switch tube Q1 and the switch tube Q4 are the upper arm of the bridge, and the switch tube Q2 and the switch tube Q3 are the lower arm of the bridge; the capacitor C12 is an electrolytic capacitor, the capacitor C20 is a 0.1μF high-frequency filter capacitor, the inductor L2 and the capacitor C13 form an LC power low-pass filter circuit to make the output a smooth sinusoidal output, and the resistor R67 is the load; the resistor R14, the resistor R6, the resistor R22 and the diode D3 are switches The drive circuit for transistor Q1 includes resistors R13, R7, R21, and diode D8, which drive transistor Q2. Resistors R12, R9, R26, and diode D7 drive transistor Q3. Resistors R19, R8, R24, and diode D6 drive transistor Q4. This circuit requires the addition of an absorption circuit (not shown) for each switching transistor. This circuit structure requires a larger number of components, making the circuit structure more complex and increasing debugging complexity, which reduces the efficiency, stability, and reliability of the inverter circuit. Based on this, embodiments of the present invention provide a resonant soft-switching inverter circuit, system, and method. This technology can be applied to applications where it is necessary to reduce the turn-on and turn-off losses of the inverter circuit.

[0024] To facilitate understanding of this embodiment, a resonant soft-switching inverter circuit disclosed in an embodiment of the present invention is first introduced. Figure 2 As shown, the circuit includes: a capacitor module 20, an H-bridge inverter module 21 and a resonance module 22;

[0025] The capacitor module 20 has a first end and a second end; the first end of the capacitor module 20 is connected to the positive pole of the power supply, and the second end of the capacitor module 20 is connected to the negative pole of the power supply; in specific applications, a suitable power supply can be selected according to actual needs, for example, it can be a 330V power supply, etc.; the capacitor module can be connected in parallel with the power supply, and the capacitor module can be used to store electrical energy, smooth voltage, filter, improve circuit performance, etc.

[0026] The H-bridge inverter module 21 has a first input terminal, a second input terminal, a first output terminal, and a second output terminal; the first input terminal of the H-bridge inverter module 21 is connected to the first terminal of the capacitor module 20, and the second input terminal of the H-bridge inverter module 21 is connected to the second terminal of the capacitor module 20;

[0027] The resonance module 22 has a first end, a second end, a third end, a fourth end and a fifth end; the first end of the resonance module 22 is connected to the first output end of the H-bridge inverter module 21, the second end of the resonance module 22 is connected to the second output end of the H-bridge inverter module 21, the third end of the resonance module 22 is connected to the second input end of the H-bridge inverter module 21, and a load is connected between the fourth end of the resonance module 22 and the fifth end of the resonance module 22; the resonance module 22 is used to control the charging state and discharging state of the first capacitor in the resonance module 22, so that each switch tube in the H-bridge inverter module 21 is zero voltage on or zero current on when turned on, and zero voltage off or zero current off when turned off.

[0028] In this embodiment, the first input terminal and the second input terminal of the H-bridge inverter module 21 are respectively connected to the first terminal and the second terminal of the capacitor module 20. The H-bridge inverter module 21 is powered by the power supply and the capacitor module 20. The switch tube in the H-bridge inverter module 21 can be implemented by MOSFET, and of course, it can also be implemented by other electronic components with equivalent functions to MOSFET. The first output terminal and the second output terminal of the H-bridge inverter module 21 are respectively connected to the first terminal and the second terminal of the resonance module 22. The resonance module 22 includes a first capacitor, which can also be called a resonant capacitor. By controlling the charging state or discharging state of the first capacitor, each switch tube in the H-bridge inverter module 21 can be turned on at zero voltage or zero current when turned on, that is, the switch tube is in a zero voltage state or a zero current state when turned on; and when turned off, it is turned off at zero voltage or zero current, that is, the switch tube is in a zero voltage state or a zero current state when turned off.

[0029] The above-mentioned resonant soft-switching inverter circuit can realize, through the resonant module, that each switch tube in the H-bridge inverter module is turned on with zero voltage or zero current, and turned off with zero voltage or zero current when turned off. This fundamentally solves the loss problem of the switch tube when turning on or off, thereby improving the efficiency, stability and reliability of the circuit.

[0030] Further, such as Figure 3 A schematic diagram of a circuit topology structure shown in FIG. 1 shows a resonant module including: a first switch tube Q5, a first resistor R1, a second resistor R3, a second switch tube Q6, a third resistor R2, a fourth resistor R4, a first diode D1, a second diode D2, a first capacitor C15, a second capacitor C13, and a first inductor L2;

[0031] The first switch tube Q5 has a gate, a source, and a drain. The drain of the first switch tube Q5 is connected to the first output terminal of the H-bridge inverter module 21. The first switch tube Q5 can be implemented by an N-channel MOSFET.

[0032] The first resistor R1 has a first end and a second end. The first end of the first resistor R1 is connected to the source of the first switching tube Q5, and the second end of the first resistor R1 is connected to the gate of the first switching tube Q5. The resistance value of the first resistor R1 can be set according to actual needs. The first resistor R1 is connected between the gate and source of the first switching tube Q5.

[0033] The second resistor R3 has a first end and a second end. The first end of the second resistor R3 is connected to the gate of the first switch tube Q5, and the second end of the second resistor R3 is connected to the first control signal CTL-A. The resistance of the second resistor R3 can be set according to actual needs. One end of the second resistor R3 is connected to the gate of the first switch tube Q5, and the other end is used to receive the first control signal CTL-A. The first control signal CTL-A can be used to control the opening or closing of the first switch tube Q5.

[0034] The second switch tube Q6 has a gate, a source and a drain. The drain of the second switch tube Q6 is connected to the second output terminal of the H-bridge inverter module 21. The second switch tube Q6 can be implemented by an N-channel MOSFET.

[0035] The third resistor R2 has a first end and a second end. The first end of the third resistor R2 is connected to the source of the second switch tube Q6, and the second end of the third resistor R2 is connected to the gate of the second switch tube Q6. The resistance value of the third resistor R2 can be set according to actual needs. The third resistor R2 is connected between the gate and source of the second switch tube Q6.

[0036] The fourth resistor R4 has a first end and a second end. The first end of the fourth resistor R4 is connected to the gate of the second switch tube Q6, and the second end of the fourth resistor R4 is connected to the second control signal CTL-B. The resistance of the fourth resistor R4 can be set according to actual needs. One end of the fourth resistor R4 is connected to the gate of the second switch tube Q6, and the other end is used to receive the second control signal CTL-B. The second control signal CTL-B can be used to control the turning on or off of the second switch tube Q6.

[0037] The first diode D1 is configured such that the anode of the first diode D1 is connected to the second input terminal of the H-bridge inverter module 21 , and the cathode of the first diode D1 is connected to the first end of the first resistor R1 ;

[0038] The second diode D2 is configured such that the anode of the second diode D2 is connected to the second input terminal of the H-bridge inverter module 21 , and the cathode of the second diode D2 is connected to the first end of the third resistor R2 ;

[0039] The first capacitor C15 has a first end and a second end. The first end of the first capacitor C15 is connected to the cathode of the first diode D1, and the second end of the first capacitor C15 is connected to the cathode of the second diode D2. Specifically, the capacitance of the first capacitor C15 can be set according to actual needs. The first capacitor C15 is connected between the cathode of the first diode D1 and the cathode of the second diode D2.

[0040] The second capacitor C13 has a first end and a second end. The first end of the second capacitor C13 is connected to the first output end of the H-bridge inverter module 21 and the fourth end AC-M1 of the resonance module 22 respectively. The second end of the second capacitor C13 is connected to the fifth end AC_OUT_L of the resonance module 22.

[0041] The first inductor L2 has a first end and a second end. The first end of the first inductor L2 is connected to the second end of the second capacitor C13, and the second end of the first inductor L2 is connected to the second output terminal of the H-bridge inverter module 21. The capacitance of the second capacitor C13 and the inductance of the first inductor L2 can be set according to actual needs. The second capacitor C13 and the first inductor L2 form an LC power low-pass filter circuit, which produces a smooth sinusoidal output. A load R67 can be connected between the fourth terminal AC-M1 and the fifth terminal AC_OUT_L of the resonant module 22.

[0042] Furthermore, the capacitor module 20 includes: a third capacitor C12 and a fourth capacitor C20; the third capacitor C12 has a first end and a second end, the first end of the third capacitor C12 is connected to the positive pole of the power supply, and the second end of the third capacitor C12 is connected to the negative pole of the power supply; the fourth capacitor C20 has a first end and a second end, the first end of the fourth capacitor C20 is connected to the positive pole of the power supply, and the second end of the fourth capacitor C20 is connected to the negative pole of the power supply.

[0043] The above-mentioned third capacitor C12 can be implemented by an electrolytic capacitor, etc.; the capacitance values ​​of the third capacitor C12 and the fourth capacitor C20 can be set according to actual needs. For example, the fourth capacitor C20 can adopt a 0.1μF high-frequency filter capacitor, etc.; the third capacitor C12 and the fourth capacitor C20 are respectively connected between the positive electrode of the power supply and the negative electrode of the power supply. Through these two capacitors, the power supply can be filtered and processed, thereby storing electrical energy, smoothing voltage, filtering, improving circuit performance, etc.

[0044] Further, such as Figure 3 As shown, the H-bridge inverter module includes:

[0045] A third switch tube Q1 and a first driving module connected to the third switch tube Q1; the third switch tube Q1 can be implemented by using an N-channel MOSFET, and the first driving module can be used to control the on or off of the third switch tube Q1.

[0046] A fourth switch tube Q2 and a second drive module connected to the fourth switch tube; the fourth switch tube Q2 and the third switch tube Q1 are complementary and conductive; the fourth switch tube Q2 can be implemented using an N-channel MOSFET, and the second drive module can be used to control the opening or closing of the fourth switch tube Q2.

[0047] a fifth switch tube Q4 and a third driving module connected to the fifth switch tube Q4; the fifth switch tube Q4 may be implemented by an N-channel MOSFET, and the third driving module may be used to control the on or off of the fifth switch tube Q4.

[0048] A sixth switch tube Q3 and a fourth drive module connected to the sixth switch tube Q3; the sixth switch tube Q3 and the fifth switch tube Q4 are complementary and conductive; the sixth switch tube Q3 can be implemented using an N-channel MOSFET, and the fourth drive module can be used to control the opening or closing of the sixth switch tube Q3.

[0049] The third switch tube Q1 and the fourth switch tube Q2 are coupled in series between the positive electrode and the negative electrode of the power supply, and the fifth switch tube Q4 and the sixth switch tube Q3 are coupled in series between the positive electrode and the negative electrode of the power supply. The common end of the third switch tube Q1 and the fourth switch tube Q2 constitutes the first output end of the H-bridge inverter module, and the common end of the fifth switch tube Q4 and the sixth switch tube Q3 constitutes the second output end of the H-bridge inverter module.

[0050] In actual implementation, the drain of the third switch tube Q1 is connected to the positive pole of the power supply, the source of the third switch tube Q1 is connected to the drain of the fourth switch tube Q2, and the common end is used as the first output end of the H-bridge inverter module, and the source of the fourth switch tube Q2 is connected to the negative pole of the power supply; the drain of the fifth switch tube Q4 is connected to the positive pole of the power supply, the source of the fifth switch tube Q4 is connected to the drain of the sixth switch tube Q3, and the common end is used as the second output end of the H-bridge inverter module, and the source of the sixth switch tube Q3 is connected to the negative pole of the power supply. Figure 3 In the embodiment, the third switch tube Q1 and the sixth switch tube Q3, the fourth switch tube Q2 and the fifth switch tube Q4 form two pairs of tubes of a full bridge.

[0051] Furthermore, the first switch tube Q5, the second switch tube Q6, the third switch tube Q1, the fourth switch tube Q2, the fifth switch tube Q4, and the sixth switch tube Q3 all have parasitic diodes. In this embodiment, since the first switch tube Q5, the second switch tube Q6, the third switch tube Q1, the fourth switch tube Q2, the fifth switch tube Q4, and the sixth switch tube Q3 are all implemented using MOSFETs, due to the structural characteristics of MOSFETs, each switch tube has a parasitic diode.

[0052] Furthermore, the first driving module includes: a fifth resistor R22, a sixth resistor R6, a seventh resistor R14, and a third diode D3;

[0053] A fifth resistor R22 has a first end and a second end, the first end of which is connected to the gate of the third switching transistor Q1. A sixth resistor R6 has a first end and a second end, the first end of which is connected to the gate of the third switching transistor Q1. A seventh resistor R14 has a first end and a second end, the first end of which is connected to the gate of the third switching transistor Q1, and the second end of which is connected to the source of the third switching transistor Q1. A third diode D3 is configured such that an anode of the third diode D3 is connected to the second end of the fifth resistor R22, and a cathode of the third diode D3 is connected to the second end of the sixth resistor R6. The cathode of the third diode D3 is also connected to the first drive signal DRIVEER2_H.

[0054] In actual implementation, the resistance values ​​of the fifth resistor R22, the sixth resistor R6 and the seventh resistor R14 can be set according to actual needs. After the first driving module receives the first driving signal DRIVEER2_H, it can provide corresponding drive for the third switch tube Q1 through the fifth resistor R22, the sixth resistor R6, the seventh resistor R14 and the third diode D3 to control the third switch tube Q1 to be turned on or off.

[0055] The second driving module includes: an eighth resistor R21, a ninth resistor R7, a tenth resistor R13 and a fourth diode D8;

[0056] An eighth resistor R21 has a first end and a second end, the first end of the eighth resistor R21 being connected to the gate of the fourth switching transistor Q2. A ninth resistor R7 has a first end and a second end, the first end of the ninth resistor R7 being connected to the gate of the fourth switching transistor Q2. A tenth resistor R13 has a first end and a second end, the first end of the tenth resistor R13 being connected to the gate of the fourth switching transistor Q2, and the second end of the tenth resistor R13 being connected to the source of the fourth switching transistor Q2. A fourth diode D8 is configured such that an anode of the fourth diode D8 is connected to the second end of the eighth resistor R21, and a cathode of the fourth diode D8 is connected to the second end of the ninth resistor R7. The cathode of the fourth diode D8 is also connected to the second drive signal DRIVEER1_L.

[0057] In actual implementation, the resistance values ​​of the eighth resistor R21, the ninth resistor R7, and the tenth resistor R13 can be set according to actual needs. After the second driving module receives the second driving signal DRIVEER1_L, it can provide corresponding drive for the fourth switch tube Q2 through the eighth resistor R21, the ninth resistor R7, the tenth resistor R13 and the fourth diode D8 to control the fourth switch tube Q2 to be turned on or off.

[0058] The third driving module includes: an eleventh resistor R24, a twelfth resistor R8, a thirteenth resistor R19 and a fifth diode D6;

[0059] An eleventh resistor R24 ​​has a first end and a second end, the first end of the eleventh resistor R24 ​​being connected to the gate of the fifth switching transistor Q4. A twelfth resistor R8 has a first end and a second end, the first end of the twelfth resistor R8 being connected to the gate of the fifth switching transistor Q4. A thirteenth resistor R19 has a first end and a second end, the first end of the thirteenth resistor R19 being connected to the gate of the fifth switching transistor Q4, and the second end of the thirteenth resistor R19 being connected to the source of the fifth switching transistor Q4. A fifth diode D6 is configured such that an anode of the fifth diode D6 is connected to the second end of the eleventh resistor R24, and a cathode of the fifth diode D6 is connected to the second end of the twelfth resistor R8. The cathode of the fifth diode D6 is also connected to the third drive signal DRIVEER4_H.

[0060] In actual implementation, the resistance values ​​of the eleventh resistor R24, the twelfth resistor R8, and the thirteenth resistor R19 can be set according to actual needs. After the third driving module receives the third driving signal DRIVEER4_H, it can provide corresponding drive for the fifth switch tube Q4 through the eleventh resistor R24, the twelfth resistor R8, the thirteenth resistor R19 and the fifth diode D6 to control the fifth switch tube Q4 to be turned on or off.

[0061] The fourth driving module includes: a fourteenth resistor R9, a fifteenth resistor R26, a sixteenth resistor R12 and a sixth diode D7;

[0062] The fourteenth resistor R9 has a first end and a second end, and the first end of the fourteenth resistor R9 is connected to the gate of the sixth switching transistor Q3; the fifteenth resistor R26 has a first end and a second end, and the first end of the fifteenth resistor R26 is connected to the gate of the sixth switching transistor Q3; the sixteenth resistor R12 has a first end and a second end, and the first end of the sixteenth resistor R12 is connected to the gate of the sixth switching transistor Q3, and the second end of the sixteenth resistor R12 is connected to the source of the sixth switching transistor Q3; the sixth diode D7 is configured such that the anode of the sixth diode D7 is connected to the second end of the fifteenth resistor R26; the cathode of the sixth diode D7 is connected to the second end of the fourteenth resistor R9, and the cathode of the sixth diode D7 is also connected to the fourth drive signal DRIVEER3_L.

[0063] In actual implementation, the resistance values ​​of the fourteenth resistor R9, the fifteenth resistor R26, and the sixteenth resistor R12 can be set according to actual needs. After the fourth driving module receives the fourth driving signal DRIVEER3_L, it can provide corresponding drive for the sixth switch tube Q3 through the fourteenth resistor R9, the fifteenth resistor R26, the sixteenth resistor R12 and the sixth diode D7 to control the sixth switch tube Q3 to be turned on or off.

[0064] The resonant soft-switching inverter circuit described above discloses a topological structure for converting DC to AC energy. It is a safer, more reliable, and energy-efficient topological circuit. This circuit requires only a first capacitor to achieve lossless absorption of the four MOSFET bridge arms of the full bridge, reducing the use of components and lowering costs. In addition, this circuit can also use ordinary MOSFETs with smaller current specifications to further reduce costs. It also reduces the difficulty of power PCB wiring, is more conducive to power wiring, can greatly reduce the intensity of parasitic interference sources generated by the PCB, and greatly improve the electromagnetic environment of the power supply.

[0065] In addition, the circuit has a strong lossless absorption capability and can be freely and easily configured. Since a first capacitor is used, debugging is simpler, which can greatly reduce the difficulty of research and development and improve the efficiency of research and development.

[0066] This circuit utilizes the principle of LC resonance to effectively address the parasitic capacitance of MOSFETs, fundamentally resolving the loss issues during MOSFET on- and off-state conduction, effectively improving circuit conversion efficiency and system reliability. This higher efficiency generates less heat, requiring a smaller heat dissipation area, and effectively increasing product power density. This circuit solution is particularly effective in high-voltage inverters.

[0067] An embodiment of the present invention further provides a resonant soft-switching inverter system, comprising: any one of the above-mentioned resonant soft-switching inverter circuits.

[0068] Furthermore, the system also includes: a first control module, a second control module, a third control module, a fourth control module, a fifth control module, and a sixth control module; the first control module, the second control module, the third control module, the fourth control module, the fifth control module, and the sixth control module are respectively connected to the resonant soft-switching inverter circuit; the first control module is used to output a first control signal for the resonant soft-switching inverter circuit; the second control module is used to output a second control signal for the resonant soft-switching inverter circuit; the third control module is used to output a first drive signal for the resonant soft-switching inverter circuit; the fourth control module is used to output a second drive signal for the resonant soft-switching inverter circuit; the fifth control module is used to output a third drive signal for the resonant soft-switching inverter circuit; and the sixth control module is used to output a fourth drive signal for the resonant soft-switching inverter circuit.

[0069] In actual implementation, the output end of the first control module can be specifically connected to the second end of the second resistor R3 in the resonant soft-switching inverter circuit. The first control module can output a first control signal CTL-A at different time sequences to control the on / off switching of the first switch Q5. The output end of the second control module can be specifically connected to the second end of the fourth resistor R4 in the resonant soft-switching inverter circuit. The second control module can output a second control signal CTL-B at different time sequences to control the on / off switching of the second switch Q6. The output end of the third control module can be specifically connected to the cathode of the third diode D3 in the resonant soft-switching inverter circuit. The third control module can output a first drive signal DRIVEER2_H at different time sequences to control the on / off switching of the third switch Q1. The output end of the fourth control module can be specifically connected to the cathode of the fourth diode D8 in the resonant soft-switching inverter circuit. The fourth control module can output a second drive signal DRIVEER1_1 at different time sequences to control the on / off switching of the fourth switch Q2. The output end of the fifth control module can be specifically connected to the cathode of the fifth diode D6 in the resonant soft-switching inverter circuit. The fifth control module can output the third drive signal DRIVEER4_H in different timing sequences to control the conduction or disconnection of the fifth switch Q4. The output end of the sixth control module can be specifically connected to the cathode of the sixth diode D7 in the resonant soft-switching inverter circuit. The sixth control module can output the fourth drive signal DRIVEER3_L in different timing sequences to control the conduction or disconnection of the sixth switch Q3.

[0070] An embodiment of the present invention further provides a control method for a resonant soft-switching inverter circuit, which is applied to any of the above-mentioned resonant soft-switching inverter circuits and includes the following steps:

[0071] Step 1: In a first control cycle, after the power supply is connected to the resonant soft-switching inverter circuit, the sixth switch Q3 and the second switch Q6 in the resonant soft-switching inverter circuit are controlled to be turned on; wherein the voltage across the first capacitor C15 in the resonant soft-switching inverter circuit is zero, so that the sixth switch Q3 and the second switch Q6 are both turned on at zero voltage;

[0072] Specifically, taking the power supply of +330VBUS as an example, when +330VBUS is powered on normally, the sixth switch Q3 is controlled to be turned on, and the second switch Q6 is controlled to be turned on at the same time. Since this is the first time the switch is turned on, the voltage across the first capacitor C15 is 0V, and the VDS (drain-source voltage) of the sixth switch Q3 is also 0V. Therefore, the sixth switch Q3 is turned on at 0V, and there is no switching loss. In addition, the second switch Q6 is also turned on at zero voltage.

[0073] Step 2: Control the third switch tube Q1 in the resonant soft-switching inverter circuit to be turned on, wherein at the moment the third switch tube Q1 is turned on, the current flowing through the third switch tube Q1 is zero, so that the third switch tube Q1 is turned on with zero current;

[0074] The third switch Q1 is turned on. Since the second capacitor C13 is typically very large, the +330 VBUS voltage is applied directly to the first inductor L2, which acts as an energy storage filter. At the moment +330 VBUS is applied, the current flowing through the first inductor L2 is 0 A. This reduces the initial conduction loss of the third switch Q1. At this point, both the third switch Q1 and the sixth switch Q3 are turned on, forming a current loop: power supply - Q1 - C13 - L2 - Q3 - power supply.

[0075] Step 3: Control the first switch Q5 in the resonant soft-switching inverter circuit to be turned on so as to fully charge the first capacitor C15 through the power supply;

[0076] After controlling the third switch tube Q1 to be turned on, the first switch tube Q5 is controlled to be turned on to fully charge the first capacitor C15. The corresponding charging circuit is: power supply-Q1-Q5-C15-parasitic diode of Q6-Q3-power supply.

[0077] Step 4: Control the third switch Q1 to turn off, and discharge the first capacitor C15 through the first loop. The voltage between the drain and source of the third switch Q1 is zero, so that the third switch Q1 is turned off at zero voltage. The first loop is a loop composed of the first capacitor C15, the parasitic diode of the first switch Q5, the second capacitor C13, the first inductor L2, the sixth switch Q3, and the second diode D2 in the resonant soft-switching inverter circuit.

[0078] Step 5: After the first capacitor C15 has completed discharging, the fourth switch tube Q2 in the resonant soft-switching inverter circuit is controlled to be turned on; wherein the voltage between the drain and source of the fourth switch tube Q2 is zero, so that the fourth switch tube Q2 is turned on at zero voltage;

[0079] The third switch Q1 is controlled to be turned off. Since the first capacitor C15 is fully charged, the VDS voltage of the third switch Q1 is 0V, and the third switch Q1 is turned off at "0V". At this time, the energy in the first capacitor C15 needs to pass through the parasitic diode of the first switch Q5 and the second capacitor C13 in sequence, and is charged into the first inductor L2. At this time, the voltage of the first capacitor C15 gradually decreases. The corresponding discharge circuit is: C15-Q5's parasitic diode-C13-L2-Q3-D2. Since the current in the first inductor L2 cannot change suddenly, when the voltage of the first capacitor C15 drops to 0V, the fourth switch Q2 is turned on. The VDS voltage of Q2 is 0V, and the fourth switch Q2 is turned on at 0V.

[0080] Step 6: Control the first switch tube Q5 to turn off, and control the sixth switch tube Q3 to turn off; wherein the voltage between the drain and source of the sixth switch tube is zero, so that the sixth switch tube Q3 is turned off at zero voltage;

[0081] After the fourth switch Q2 is turned on, the first switch Q5 is turned off, and no current loop is created. The sixth switch Q3 is turned off, and since the voltage across the first capacitor C15 is 0V, the sixth switch Q3 is also turned off at "0V".

[0082] Step 7: The first inductor L2 charges the first capacitor C15 through the second loop; wherein the second loop is a loop composed of the first inductor L2, the second switch Q6, the first capacitor C15, the parasitic diode of the first switch Q5, and the second capacitor C13;

[0083] Step eight, after the first capacitor C15 is fully charged, the fifth switch tube Q4 in the resonant soft-switching inverter circuit is controlled to be turned on; wherein the voltage between the drain and source of the fifth switch tube Q4 is zero, so that the fifth switch tube is turned on at zero voltage.

[0084] After the sixth switch Q3 is turned off, the current in the first inductor L2 continues to charge the first capacitor C15, causing the voltage of the first capacitor C15 to continue to rise to +330VBUS. Excess energy returns to +330VBUS through the parasitic diode of the fifth switch Q4, thus completing the voltage clamping function of the fifth switch Q4. Since the capacitor does not lose energy during operation, lossless absorption is also achieved.

[0085] When the VDS voltage of the fifth switch Q4 is 0V, the control turns on the fifth switch Q4, completing the "0V" conduction of the fifth switch Q4. By alternately turning on and off the third and fifth switches Q1 and Q4, lossless switching alternating energy output is achieved, thereby reducing damage and improving efficiency.

[0086] The first switch tube Q5 is controlled to be turned on, and the second switch tube Q6 remains turned on, so as to fully charge the first capacitor C15 and prepare for the next repeated cycle. This completes a complete control cycle.

[0087] It should be noted that the first diode D1 and the second diode D2 can reduce the loss of the first capacitor C15 during commutation and freewheeling, provide a freewheeling channel with lower loss for the first switch tube Q5 and the second switch tube Q6, and further reduce the absorption loss.

[0088] Furthermore, the method further comprises:

[0089] In each subsequent control cycle, the turn-on sequence and turn-off sequence of the third switch tube, the fourth switch tube, the fifth switch tube, and the sixth switch tube are controlled according to the charging state and the discharging state of the first capacitor, so that the third switch tube, the fourth switch tube, the fifth switch tube, and the sixth switch tube are turned on with zero voltage or zero current when turned on, and are turned off with zero voltage or zero current when turned off.

[0090] In each subsequent control cycle, the switching sequence of the third switch Q1 and the sixth switch Q3, the fourth switch Q2 and the fifth switch Q4, and the first switch Q5 and the second switch Q6 is controlled so that the VDS of the third switch Q1 and the sixth switch Q3, and the fourth switch Q2 and the fifth switch Q4 are turned on and off at 0 V. This eliminates switching losses of the third switch Q1 and the sixth switch Q3, and the fourth switch Q2 and the fifth switch Q4, thereby improving the efficiency of the entire system.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A control method for a resonant soft-switching inverter circuit, characterized in that: The resonant soft-switching inverter circuit comprises: An H-bridge inverter module comprises a third switch tube and a fourth switch tube coupled in series between a first input terminal and a second input terminal of the H-bridge inverter module; and a fifth switch tube and a sixth switch tube coupled in series between the first input terminal and the second input terminal of the H-bridge inverter module; a common terminal of the third switch tube and the fourth switch tube constitutes a first output terminal of the H-bridge inverter module, and a common terminal of the fifth switch tube and the sixth switch tube constitutes a second output terminal of the H-bridge inverter module; the fourth switch tube and the third switch tube are complementary to each other; and the sixth switch tube and the fifth switch tube are complementary to each other. The resonant module includes: a first switch tube, a drain of which is connected to the first output terminal of the H-bridge inverter module; a second switch tube, a drain of which is connected to the second output end of the H-bridge inverter module; a first diode, an anode of which is connected to the second input terminal of the H-bridge inverter module, and a cathode of which is connected to the source of the first switch tube; a second diode, an anode of which is connected to the second input terminal of the H-bridge inverter module, and a cathode of which is connected to the source of the second switch tube; a first capacitor, a first end of which is connected to the cathode of the first diode, and a second end of which is connected to the cathode of the second diode; a second capacitor, a first end of which is connected to the first output terminal of the H-bridge inverter module and the load, respectively, and a second end of which is connected to the load; a first inductor, a first end of which is connected to the second end of the second capacitor, and a second end of which is connected to the second output end of the H-bridge inverter module; The resonance module is used to control the charging state and the discharging state of the first capacitor, so that each switch tube in the H-bridge inverter module is zero voltage on or zero current on when turned on, and zero voltage off or zero current off when turned off; The method comprises: In a first control cycle, when the power supply is turned on, the sixth switch tube and the second switch tube are controlled to be turned on; Controlling the third switch tube to be turned on; controlling the first switch tube to be turned on so as to fully charge the first capacitor through the power supply; Controlling the third switch to turn off, so that the first capacitor discharges through a first loop; wherein the first loop is a loop consisting of the first capacitor, the parasitic diode of the first switch, the second capacitor, the first inductor, the sixth switch, and the second diode; When the first capacitor is completely discharged, controlling the fourth switch to be turned on; Controlling the first switch tube and the sixth switch tube to turn off; The first inductor charges the first capacitor through a second loop; wherein the second loop is a loop consisting of the first inductor, the second switch tube, the first capacitor, the parasitic diode of the first switch tube, and the second capacitor; After the first capacitor is fully charged, the fifth switch tube is controlled to be turned on.

2. The method according to claim 1, characterized in that The H-bridge inverter module further includes: a first driving module connected to the third switching tube; a second driving module connected to the fourth switching tube; a third driving module connected to the fifth switching tube; and a fourth driving module connected to the sixth switch tube; The first driving module includes: a fifth resistor, a first end of which is connected to the gate of the third switching tube; a sixth resistor, a first end of which is connected to the gate of the third switching tube; a seventh resistor, a first end of which is connected to the gate of the third switching transistor, and a second end of which is connected to the source of the third switching transistor; a third diode, an anode of which is connected to the second end of the fifth resistor, and a cathode of which is connected to the second end of the sixth resistor and the first driving signal; The second driver module includes: an eighth resistor, a first end of which is connected to the gate of the fourth switching tube; a ninth resistor, a first end of which is connected to the gate of the fourth switching tube; a tenth resistor, a first end of which is connected to the gate of the fourth switching transistor, and a second end of which is connected to the source of the fourth switching transistor; a fourth diode, an anode of which is connected to the second end of the eighth resistor; and a cathode of which is connected to the second end of the ninth resistor and the second driving signal; The third driver module includes: an eleventh resistor, a first end of which is connected to the gate of the fifth switching tube; a twelfth resistor, a first end of which is connected to the gate of the fifth switching tube; a thirteenth resistor, a first end of which is connected to the gate of the fifth switching transistor, and a second end of which is connected to the source of the fifth switching transistor; a fifth diode, an anode of which is connected to the second end of the eleventh resistor, and a cathode of which is connected to the second end of the twelfth resistor and a third driving signal; The fourth driver module includes: a fourteenth resistor, a first end of which is connected to the gate of the sixth switching tube; a fifteenth resistor, a first end of which is connected to the gate of the sixth switching tube; a sixteenth resistor, a first end of which is connected to the gate of the sixth switch tube, and a second end of which is connected to the source of the sixth switch tube; A sixth diode has an anode connected to the second end of the fifteenth resistor, and a cathode connected to the second end of the fourteenth resistor and the fourth driving signal.

3. The method according to claim 2, characterized in that The resonance module further includes: a first resistor, a first end of which is connected to the source of the first switching transistor, and a second end of which is connected to the gate of the first switching transistor; a second resistor, a first end of which is connected to the gate of the first switch tube, and a second end of which is connected to the first control signal; a third resistor, a first end of which is connected to the source of the second switching transistor, and a second end of which is connected to the gate of the second switching transistor; A fourth resistor has a first end connected to the gate of the second switch tube, and a second end connected to the second control signal.

4. The method according to claim 1, wherein The resonant soft-switching inverter circuit further includes: A capacitor module, a first end of which is connected to the positive electrode of the power supply, and a second end of which is connected to the negative electrode of the power supply; a first input end of the H-bridge inverter module is connected to the first end of the capacitor module, and a second input end of the H-bridge inverter module is connected to the second end of the capacitor module; The capacitor module includes: a third capacitor, a first end of which is connected to the positive electrode of the power supply, and a second end of which is connected to the negative electrode of the power supply; A fourth capacitor has a first end connected to the positive electrode of the power supply, and a second end connected to the negative electrode of the power supply.

5. The method according to claim 1, wherein The first switching tube, the second switching tube, the third switching tube, the fourth switching tube, the fifth switching tube, and the sixth switching tube all have parasitic diodes.

6. The method according to claim 1, characterized in that The method further comprises: In each subsequent control cycle, the turn-on sequence and turn-off sequence of the third switch tube, the fourth switch tube, the fifth switch tube, and the sixth switch tube are controlled according to the charging state and the discharging state of the first capacitor, so that the third switch tube, the fourth switch tube, the fifth switch tube, and the sixth switch tube are turned on with zero voltage or zero current when turned on, and are turned off with zero voltage or zero current when turned off.

7. A resonant soft-switching inverter system, characterized in that: The system is used to run the control method of the resonant soft-switching inverter circuit according to claim 3.

8. The system according to claim 7, characterized in that The system further includes: a first control module, a second control module, a third control module, a fourth control module, a fifth control module, and a sixth control module; the first control module, the second control module, the third control module, the fourth control module, the fifth control module, and the sixth control module are respectively connected to the resonant soft-switching inverter circuit; The first control module is used to output the first control signal; The second control module is used to output the second control signal; The third control module is used to output the first driving signal; The fourth control module is used to output the second driving signal; The fifth control module is used to output the third driving signal; The sixth control module is configured to output the fourth driving signal.

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