An IGBT full-bridge series inverter power supply control system

Abstract

The present invention discloses an IGBT full-bridge series inverter power supply control system, which relates to the technical field of inverter power supplies. The system includes an inverter output module that converts the DC electrical energy connected by the power supply module. When the detected electrical energy is greater than the first voltage threshold or less than the second voltage threshold, the intelligent control module controls the soft-switching module to perform zero-voltage and zero-current soft-switching processing on the unturned-on switching elements in the inverter output module, reducing the rate of change of the terminal voltage of the switching elements in the off state and performing zero-voltage soft-turn-off. When the detected electrical energy is less than the first voltage threshold or the second voltage threshold, the soft-switching module cooperates with the auxiliary capacitor module to perform half-bridge inversion and output compensation or increase the output voltage range through the series compensation module with the electrical energy output by the inverter control module. The IGBT full-bridge series inverter power supply control system of the present invention can reduce switching losses, improve the conversion efficiency and power supply accuracy of electrical energy, and increase the power supply voltage range.

Description

Technical Field

[0001] The present invention relates to the technical field of inverter power supplies, and specifically to an IGBT full-bridge series inverter power supply control system. Background Art

[0002] The IGBT full-bridge series inverter power supply is a topology of a power electronic converter, mainly used to convert a DC power supply into an AC power supply. It is based on the H-bridge circuit structure and consists of four IGBT switching elements, capacitors, inductors and other components. In the prior art, when the IGBT full-bridge series inverter power supply is subject to external interferences such as electromagnetic interference and radio frequency interference, it is easy to increase the IGBT switching loss, resulting in a reduction in the power conversion efficiency. And because the voltage withstand capacity of the IGBT switching element is certain, there is a maximum supply voltage for the IGBT full-bridge series inverter power supply. When the required voltage exceeds this maximum supply voltage, the power supply demand cannot be met. Therefore, it needs to be improved. Summary of the Invention

[0003] An embodiment of the present invention provides an IGBT full-bridge series inverter power supply control system to solve the problems raised in the above background art.

[0004] According to the embodiment of the present invention, an IGBT full-bridge series inverter power supply control system is provided, including:

[0005] A detection module, connected to the power supply module and the inverter output module, for performing voltage sampling on the DC electrical energy accessed by the power supply module and comparing the voltage with a first voltage threshold, and performing voltage sampling on the inverter output module and comparing the voltage with a second voltage threshold;

[0006] An intelligent control module, connected to the detection module and the inverter output module, for controlling the inverter output module to perform inverter operation. When the voltage is greater than the first voltage threshold or less than the second voltage threshold, controlling the soft-switching module to adjust the switching voltage and current of the inverter output module. When the voltage is less than the first voltage threshold or the second voltage threshold, controlling the power transmission state of the soft-switching module;

[0007] An inverter output module, connected to the power supply module, for performing inverter processing on the DC electrical energy, filtering the inverted electrical energy or the superimposed electrical energy and outputting it;

[0008] A soft-switching module, connected to the power supply module, the inverter output module and the intelligent control module, for transmitting electrical energy, reducing the rate of change of the terminal voltage and current of the non-conducting switching elements in the inverter output module and performing zero-voltage soft turn-on and zero-current soft turn-on, and reducing the rate of change of the terminal voltage of the switching elements during turn-off and performing zero-voltage soft turn-off.

[0009] As a further aspect of the present invention: The IGBT full-bridge series inverter power supply control system further includes an auxiliary switch module, an auxiliary capacitor module, and a series compensation module; The detection module includes an input detection sub-module and an output detection sub-module;

[0010] Preferably, the input detection sub-module is connected to the power supply module and is used for voltage sampling of the DC electrical energy accessed by the power supply module and comparing the voltage with a first voltage threshold;

[0011] The output detection sub-module is connected to the inverter output module and is used for voltage sampling of the inverter output module and comparing the voltage with a second voltage threshold;

[0012] The auxiliary switch module is connected to the output detection sub-module, the soft-switching module, and the input detection sub-module, and is used for controlling the power transmission state of the soft-switching module and the inverter output module. When the voltage is less than the first voltage threshold or the second voltage threshold, it controls the soft-switching module to stop working;

[0013] The auxiliary capacitor module is connected to the power supply module and the intelligent control module, and is used for receiving and storing DC electrical energy and releasing the stored electrical energy, and cooperating with the series compensation module to perform half-bridge inversion work;

[0014] The series compensation module is connected to the auxiliary capacitor module, the inverter output module, and the soft-switching module, and is used for superimposing the released electrical energy and the electrical energy transmitted by the soft-switching module and outputting the superimposed electrical energy to the inverter output module.

[0015] As a further aspect of the present invention: The power supply module includes a power supply interface and a first capacitor; The inverter output module includes a third power transistor, a fourth power transistor, a fifth power transistor, a sixth power transistor, a second capacitor, a second inductor, and an output port; The intelligent control module includes a first controller;

[0016] Preferably, the first end of the power supply interface is connected to the first end of the first capacitor, the collector of the third power transistor, and the collector of the fifth power transistor. The emitter of the third power transistor is connected to the collector of the fourth power transistor and is sequentially connected to the first end of the output port through the second capacitor and the second inductor. The emitter of the fifth power transistor is connected to the collector of the sixth power transistor. The second end of the output port is connected to the series compensation module. The emitter of the fourth power transistor is connected to the emitter of the sixth power transistor, the other end of the first capacitor, and the second end of the power supply interface. The gates of the third power transistor, the fourth power transistor, the fifth power transistor, and the sixth power transistor are respectively connected to the IO3 terminal, the IO4 terminal, the IO5 terminal, and the IO6 terminal of the first controller.

[0017] As a further aspect of the present invention: The soft-switching module includes a third thyristor and a fourth thyristor;

[0018] Preferably, the first end of the third thyristor is connected to the emitter of the third power transistor, the first end of the fourth thyristor is connected to the emitter of the fifth power transistor, the second end of the third thyristor is connected to the second end of the fourth thyristor, and the control ends of the third thyristor and the fourth thyristor are connected to the auxiliary switch module.

[0019] As a further aspect of the present invention: The soft-switching module further includes a first power transistor, a first diode, a third diode, a fourth diode, a second diode, a second power transistor, and a first inductor;

[0020] Preferably, the collector of the first power transistor is connected to the cathode of the third diode and the first end of the power supply interface, the emitter of the first power transistor is connected to the anode of the second diode and the cathode of the first diode, the anode of the third diode is connected to the cathode of the fourth diode and the collector of the second power transistor, the anode of the fourth diode is connected to the cathode of the second diode and the first end of the first inductor, the second end of the first inductor is connected to the second end of the third thyristor and the series compensation module, the anode of the first diode is connected to the emitter of the second power transistor and the second end of the power supply interface, and the gates of the first power transistor and the second power transistor are respectively connected to the IO1 terminal and the IO2 terminal of the first controller.

[0021] As a further aspect of the present invention: The soft-switching module further includes a second thyristor and a first thyristor;

[0022] Preferably, the anode of the second thyristor is connected to the second anode of the third diode and the cathode of the first thyristor, the cathode of the second thyristor is connected to the emitter of the first power transistor and the anode of the first thyristor, and the control end of the first thyristor is connected to the control end of the second thyristor and the IO8 terminal of the first controller.

[0023] As a further aspect of the present invention: The auxiliary capacitor module includes a fifth thyristor, a third capacitor, a fourth capacitor, and a sixth thyristor;

[0024] Preferably, one end of the fifth thyristor is connected to the first end of the power supply interface, the other end of the fifth thyristor is connected to the first end of the fourth capacitor and the series compensation module through the third capacitor, the second end of the fourth capacitor is connected to one end of the sixth thyristor, the other end of the sixth thyristor is connected to the second end of the power supply interface, and the control end of the fifth thyristor is connected to the control end of the sixth thyristor and the IO8 terminal of the first controller.

[0025] As a further aspect of the present invention: The series compensation module includes a first transformer;

[0026] Preferably, the first end and the second end of the primary side of the first transformer are respectively connected to the first end of the fourth capacitor and the second end of the first inductor, and the first end and the second end of the secondary side of the first transformer are respectively connected to the emitter of the fifth power transistor and the second end of the output port.

[0027] As a further solution of the present invention: the input detection sub-module includes a first resistor, a second resistor, a third resistor, a first potentiometer, a fourth resistor, a first comparator and a first power supply;

[0028] Preferably, the inverting input terminal of the first comparator is connected to one end of the second resistor and connected to the first end of the power supply interface through the first resistor, the other end of the second resistor is connected to the second end of the power supply interface, the non-inverting input terminal of the first comparator is connected to the sliding contact terminal of the first potentiometer, one end of the first potentiometer is connected to the first power supply through the third resistor, the other end of the first potentiometer is grounded through the fourth resistor, and the output terminal of the first comparator is connected to the IO9 terminal of the first controller and the auxiliary switch module.

[0029] As a further solution of the present invention: the output detection sub-module includes a voltage transformer, a signal processing device, a second power supply, a fifth resistor, a sixth resistor, a second potentiometer and a second comparator;

[0030] Preferably, the first end and the second end of the voltage transformer are respectively connected to the first end and the second end of the output port, the third end and the fourth end of the voltage transformer are respectively connected to the first input terminal and the second input terminal of the signal processing device, the output terminal of the signal processing device is connected to the inverting input terminal of the second comparator, the non-inverting input terminal of the second comparator is connected to the sliding contact terminal of the second potentiometer, one end of the second potentiometer is connected to the second power supply through the fifth resistor, the other end of the second potentiometer is grounded through the sixth resistor, and the output terminal of the second comparator is connected to the IO7 terminal of the first controller and the auxiliary switch module.

[0031] As a further solution of the present invention: the auxiliary switch module includes a fifth diode, a sixth diode, a first switching tube, a second switching tube, a seventh diode and an eighth diode;

[0032] Preferably, the anodes of the fifth diode and the sixth diode are respectively connected to the IO5 terminal and the IO6 terminal of the first controller, the cathode of the fifth diode is connected to the control terminal of the fourth thyristor and the collector of the first switching tube, the cathode of the sixth diode is connected to the control terminal of the third thyristor and the collector of the second switching tube, the emitter of the first switching tube is connected to the emitter of the second switching tube and the ground terminal, the base of the first switching tube is connected to the base of the second switching tube, the cathode of the seventh diode and the cathode of the eighth diode, and the anodes of the seventh diode and the eighth diode are respectively connected to the output terminal of the first comparator and the output terminal of the second comparator.

[0033] Compared with the prior art, the beneficial effects of the present invention are as follows: The IGBT full-bridge series inverter power supply control system of the present invention can invert the DC electrical energy connected to the power supply module by the inverter output module. When the DC electrical energy is greater than the set first voltage threshold or the electrical energy input to the output module is lower than the set second voltage threshold, the intelligent control module will control the soft-switching module to perform zero-voltage soft turn-on and zero-current soft turn-on processing on the unturned-on switching elements in the inverter output module, reduce the rate of change of the terminal voltage of the switching elements in the off state, perform zero-voltage soft turn-off processing, reduce the switching loss of the switching elements in the inverter output module, improve the conversion efficiency of electrical energy. When the DC electrical energy is greater than the first voltage threshold or the output voltage is less than the second voltage threshold, the soft-switching module cooperates with the auxiliary capacitor module to perform half-bridge inversion processing and superimpose the electrical energy output by the series compensation module and the inverter control module to compensate the output electrical energy or increase the output voltage range, improve the power supply accuracy and increase the power supply voltage range. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0035] Figure 1 It is a schematic block diagram of the principle of an IGBT full-bridge series inverter power supply control system provided by an embodiment of the present invention.

[0036] Figure 2 It is a circuit diagram of an IGBT full-bridge series inverter power supply control system provided by an embodiment of the present invention.

[0037] Figure 3 It is a circuit diagram of the auxiliary capacitor module provided by an embodiment of the present invention.

[0038] Figure 4 It is a circuit diagram of the series compensation module provided by an embodiment of the present invention.

[0039] Figure 5 It is a circuit diagram of the input detection sub-module provided by an embodiment of the present invention.

[0040] Figure 6 It is a circuit diagram of the output detection sub-module provided by an embodiment of the present invention.

[0041] Figure 7 It is a circuit diagram of the auxiliary switch module provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0043] In one embodiment, please refer to Figure 1 , an IGBT full-bridge series inverter power supply control system includes:

[0044] A detection module, connected to the power supply module 1 and the inverter output module 4, is used to perform voltage sampling on the DC electric energy accessed by the power supply module 1 and compare the voltage with a first voltage threshold, and perform voltage sampling on the inverter output module 4 and compare the voltage with a second voltage threshold;

[0045] An intelligent control module 3, connected to the detection module and the inverter output module 4, is used to control the inverter output module 4 to perform inverter operation. When the voltage is greater than the first voltage threshold or less than the second voltage threshold, it controls the soft-switching module 6 to adjust the switching voltage and current of the inverter output module 4. When the voltage is less than the first voltage threshold or the second voltage threshold, it controls the power transmission state of the soft-switching module 6;

[0046] An inverter output module 4, connected to the power supply module 1, is used to perform inverter processing on the DC electric energy, filter the inverted electric energy or the superimposed electric energy and output it;

[0047] A soft-switching module 6, connected to the power supply module 1, the inverter output module 4 and the intelligent control module 3, is used to transmit electric energy, reduce the voltage and current change rates at the terminals of the non-conducting switching elements in the inverter output module 4 and perform zero-voltage soft turn-on and zero-current soft turn-on, and reduce the voltage change rate of the switching elements during turn-off and perform zero-voltage soft turn-off.

[0048] Further, the IGBT full-bridge series inverter power supply control system further includes an auxiliary switch module 7, an auxiliary capacitor module 8 and a series compensation module 9; the detection module includes an input detection sub-module 2 and an output detection sub-module 5;

[0049] Specifically, the input detection sub-module 2, connected to the power supply module 1, is used to perform voltage sampling on the DC electric energy accessed by the power supply module 1 and compare the voltage with a first voltage threshold;

[0050] The output detection sub-module 5, connected to the inverter output module 4, is used to perform voltage sampling on the inverter output module 4 and compare the voltage with a second voltage threshold;

[0051] The auxiliary switch module 7, connected to the output detection sub-module 5, the soft-switching module 6, and the input detection sub-module 2, is used to control the power transmission state of the soft-switching module 6 and the inverter output module 4. When the voltage is less than the first voltage threshold or the second voltage threshold, it controls the soft-switching module 6 to stop working;

[0052] The auxiliary capacitor module 8, connected to the power supply module 1 and the intelligent control module 3, is used to receive and store DC power and release the stored power, and cooperate with the series compensation module 9 to perform half-bridge inversion work;

[0053] The series compensation module 9, connected to the auxiliary capacitor module 8, the inverter output module 4, and the soft-switching module 6, is used to superimpose the released power and the power transmitted by the soft-switching module 6 and output it, and transmit the superimposed power to the inverter output module 4.

[0054] More specifically, it is manifested as:

[0055] The power supply module 1 is used to access DC power;

[0056] The input detection sub-module 2 is used to sample the voltage of the DC power and output a first detection signal when the sampled signal is less than the set first voltage threshold;

[0057] The intelligent control module 3 is used to output a first inversion signal and a second inversion signal. When it does not receive the first detection signal or the second detection signal output by the output detection sub-module 5, it outputs a first pulse signal. When it receives the first detection signal or the second detection signal, it outputs a first control signal and stops outputting the first pulse signal;

[0058] The inverter output module 4 is used to perform inversion processing on the DC power and output a first AC power when it receives the first inversion signal or the second inversion signal, superimpose the second AC power output by the series compensation module 9 and the first AC power and output a third AC power, and perform filtering processing and output on the first AC power or the third AC power;

[0059] The output detection sub-module 5 is used to sample the voltage of the first AC power, perform amplification filtering and rectification processing on the sampled signal, and output a second detection signal when the processed signal is less than the set second voltage threshold;

[0060] The soft-switching module 6 is configured to receive DC electrical energy. When receiving the first pulse signal and the second control signal or the third control signal output by the auxiliary switch module 7, it reduces the terminal voltage of the unturned-on switching element of the inverter output module 4 to zero and reduces the current change rate of the unturned-on switching element, performs zero-voltage soft turn-on and zero-current soft turn-on processing on the unturned-on switching element. When the switching element of the inverter output module 4 is turned off, it reduces the terminal voltage change rate of the turning-off switching element and performs zero-voltage soft turn-off processing. When receiving the first control signal, it performs electrical energy transmission control and provides the first electrical energy;

[0061] The auxiliary switch module 7 is configured to output the second control signal when receiving the first inverter signal, output the third control signal when receiving the second inverter signal, and stop outputting the second control signal and the third control signal when receiving the first detection signal or the second detection signal;

[0062] The auxiliary capacitor module 8 is configured to receive DC electrical energy, store energy and discharge and provide the second electrical energy when receiving the first control signal;

[0063] The series compensation module 9 is configured to receive the first electrical energy and the second electrical energy and isolate and output the second AC electrical energy.

[0064] In a specific embodiment, the above-mentioned power supply module 1 may adopt a power supply circuit composed of a power supply interface and a capacitor, which can access DC electric energy and perform filtering; the above-mentioned input detection sub-module 2 may adopt an input detection circuit composed of a resistor, a comparator, a potentiometer, etc., which can sample the voltage of the DC electric energy and compare the magnitude of the sampled signal with a set first voltage threshold, and the first voltage threshold is the required input voltage; the above-mentioned intelligent control module 3 may adopt an intelligent control circuit composed of a single-chip microcomputer, which integrates many components such as an arithmetic unit, a controller, a memory, and an input / output device, and realizes functions such as signal processing, data storage, module control, and timing control; the above-mentioned inverter output module 4 may adopt an inverter output circuit composed of four groups of IGBTs, capacitors, inductors, and output ports, which can perform inversion adjustment and electric energy filtering processing on the input DC electric energy and output electric energy; the above-mentioned output detection sub-module 5 may adopt an output detection circuit composed of a voltage transformer, a signal processing device, a comparator, etc., which can sample the voltage of the electric energy output by the inverter output module 4, and perform amplification filtering and rectification processing on the sampled signal, and compare the magnitude of the processed signal with a set second voltage threshold, and the second voltage threshold is the required output voltage; the above-mentioned soft-switching module 6 may adopt a soft-switching circuit composed of IGBTs, diodes, thyristors, inductors, etc., which can reduce the terminal voltage of the switch element that is not turned on in the inverter output module 4 and reduce the current change rate of the switch element that is not turned on. When the switch element in the inverter output module 4 is turned off, it can reduce the voltage change rate of the switch element during turn-off; the above-mentioned auxiliary switch module 7 may adopt an auxiliary switch circuit composed of a triode and a diode, which can control the conduction states of the soft-switching module 6 and the inverter output module 4 according to the first inversion signal and the second inversion signal output by the intelligent control module 3, and stop the operation of the soft-switching module 6 when receiving the signal output by the input detection sub-module 2 or the output detection sub-module 5; the above-mentioned auxiliary capacitor module 8 may adopt an auxiliary capacitor circuit composed of a thyristor and a capacitor, which can store and discharge energy, and cooperate with the series compensation module 9 and the soft-switching module 6 to perform half-bridge inversion processing; the above-mentioned series compensation module 9 may adopt a series compensation circuit composed of a coupling transformer, which can superimpose the electric energy output by the half-bridge inversion and the electric energy output by the inverter output module 4, and then realize electric energy compensation and expand the voltage range.

[0065] In another embodiment, please refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 4 , the power supply module 1 includes a power supply interface and a first capacitor C1; the inverter output module 4 includes a third power transistor Q3, a fourth power transistor Q4, a fifth power transistor Q5, a sixth power transistor Q6, a second capacitor C2, a second inductor L2, and an output port; the intelligent control module 3 includes a first controller U1;

[0066] Specifically, the first end of the power interface is connected to the first end of the first capacitor C1, the collector of the third power transistor Q3, and the collector of the fifth power transistor Q5. The emitter of the third power transistor Q3 is connected to the collector of the fourth power transistor Q4 and is sequentially connected to the first end of the output port through the second capacitor C2 and the second inductor L2. The emitter of the fifth power transistor Q5 is connected to the collector of the sixth power transistor Q6. The second end of the output port is connected to the series compensation module 9. The emitter of the fourth power transistor Q4 is connected to the emitter of the sixth power transistor Q6, the other end of the first capacitor C1, and the second end of the power interface. The gates of the third power transistor Q3, the fourth power transistor Q4, the fifth power transistor Q5, and the sixth power transistor Q6 are respectively connected to the IO3 terminal, the IO4 terminal, the IO5 terminal, and the IO6 terminal of the first controller U1.

[0067] In a specific embodiment, the above-mentioned third power transistor Q3, fourth power transistor Q4, fifth power transistor Q5, and sixth power transistor Q6 can all be selected as N-channel field effect transistors with capacitors and parasitic diodes; the above-mentioned first controller U1 can be selected as an STM32 single-chip microcomputer.

[0068] Further, the soft-switching module 6 includes a third thyristor S3 and a fourth thyristor S4;

[0069] Specifically, the first end of the third thyristor S3 is connected to the emitter of the third power transistor Q3, the first end of the fourth thyristor S4 is connected to the emitter of the fifth power transistor Q5, the second end of the third thyristor S3 is connected to the second end of the fourth thyristor S4, and the control ends of the third thyristor S3 and the fourth thyristor S4 are connected to the auxiliary switch module 7.

[0070] In a specific embodiment, the above-mentioned third thyristor S3 and fourth thyristor S4 can both be selected as bidirectional thyristors.

[0071] Further, the soft-switching module 6 further includes a first power transistor Q1, a first diode D1, a third diode D3, a fourth diode D4, a second diode D2, a second power transistor Q2, and a first inductor L1;

[0072] Specifically, the collector of the first power transistor Q1 is connected to the cathode of the third diode D3 and the first end of the power interface. The emitter of the first power transistor Q1 is connected to the anode of the second diode D2 and the cathode of the first diode D1. The anode of the third diode D3 is connected to the cathode of the fourth diode D4 and the collector of the second power transistor Q2. The anode of the fourth diode D4 is connected to the cathode of the second diode D2 and the first end of the first inductor L1. The second end of the first inductor L1 is connected to the second end of the third thyristor S3 and the series compensation module 9. The anode of the first diode D1 is connected to the emitter of the second power transistor Q2 and the second end of the power interface. The gates of the first power transistor Q1 and the second power transistor Q2 are respectively connected to the IO1 terminal and the IO2 terminal of the first controller U1.

[0073] In a specific embodiment, the above-mentioned first power transistor Q1 and second power transistor Q2 can both be N-channel field effect transistors with parasitic diodes.

[0074] Furthermore, the soft-switching module 6 further includes a second thyristor S2 and a first thyristor S1;

[0075] Specifically, the anode of the second thyristor S2 is connected to the anode of the third diode D3 and the cathode of the first thyristor S1, the cathode of the second thyristor S2 is connected to the emitter of the first power transistor Q1 and the anode of the first thyristor S1, and the control terminal of the first thyristor S1 is connected to the control terminal of the second thyristor S2 and the IO8 terminal of the first controller U1.

[0076] In a specific embodiment, the above-mentioned first thyristor S1 and second thyristor S2 can both be one-way thyristors.

[0077] Furthermore, the auxiliary capacitor module 8 includes a fifth thyristor S5, a third capacitor C3, a fourth capacitor C4, and a sixth thyristor S6;

[0078] Specifically, one end of the fifth thyristor S5 is connected to the first end of the power supply interface, the other end of the fifth thyristor S5 is connected to the first end of the fourth capacitor C4 and the series compensation module 9 through the third capacitor C3, the second end of the fourth capacitor C4 is connected to one end of the sixth thyristor S6, the other end of the sixth thyristor S6 is connected to the second end of the power supply interface, and the control terminal of the fifth thyristor S5 is connected to the control terminal of the sixth thyristor S6 and the IO8 terminal of the first controller U1.

[0079] In a specific embodiment, the above-mentioned fifth thyristor S5 and sixth thyristor S6 can both be bidirectional thyristors; the above-mentioned third capacitor C3 and fourth capacitor C4 can both be energy storage capacitors.

[0080] Furthermore, the series compensation module 9 includes a first transformer B1;

[0081] Specifically, the first end and the second end of the primary side of the first transformer B1 are respectively connected to the first end of the fourth capacitor C4 and the second end of the first inductor L1, and the first end and the second end of the secondary side of the first transformer B1 are respectively connected to the emitter of the fifth power transistor Q5 and the second end of the output port.

[0082] In a specific embodiment, the above-mentioned first transformer B1 can be a coupling transformer.

[0083] In another embodiment, please refer to Figure 1 , Figure 2 , Figure 5 , Figure 6 and Figure 7, the input detection sub-module 2 includes a first resistor R1, a second resistor R2, a third resistor R3, a first potentiometer RP1, a fourth resistor R4, a first comparator A1, and a first power supply VCC1;

[0084] Specifically, the inverting input terminal of the first comparator A1 is connected to one end of the second resistor R2 and connected to the first end of the power supply interface through the first resistor R1. The other end of the second resistor R2 is connected to the second end of the power supply interface. The non-inverting input terminal of the first comparator A1 is connected to the sliding contact terminal of the first potentiometer RP1. One end of the first potentiometer RP1 is connected to the first power supply VCC1 through the third resistor R3, and the other end of the first potentiometer RP1 is grounded through the fourth resistor R4. The output terminal of the first comparator A1 is connected to the IO9 terminal of the first controller U1 and the auxiliary switch module 7.

[0085] In a specific embodiment, the above-mentioned first resistor R1 and second resistor R2 perform voltage sampling; the above-mentioned first power supply VCC1, third resistor R3, first potentiometer RP1, and fourth resistor R4 set a first voltage threshold; the above-mentioned first comparator A1 can be an LM358 comparator.

[0086] Further, the output detection sub-module 5 includes a voltage transformer, a signal processing device, a second power supply VCC2, a fifth resistor R5, a sixth resistor R6, a second potentiometer RP2, and a second comparator A2;

[0087] Specifically, the first end and the second end of the voltage transformer are respectively connected to the first end and the second end of the output port. The third end and the fourth end of the voltage transformer are respectively connected to the first input terminal and the second input terminal of the signal processing device. The output terminal of the signal processing device is connected to the inverting input terminal of the second comparator A2. The non-inverting input terminal of the second comparator A2 is connected to the sliding contact terminal of the second potentiometer RP2. One end of the second potentiometer RP2 is connected to the second power supply VCC2 through the fifth resistor R5, and the other end of the second potentiometer RP2 is grounded through the sixth resistor R6. The output terminal of the second comparator A2 is connected to the IO7 terminal of the first controller U1 and the auxiliary switch module 7.

[0088] In a specific embodiment, the above-mentioned signal processing device can be composed of a signal amplification and filtering circuit and a rectifier composed of an operational amplifier, a capacitor, and a resistor; the above-mentioned fifth resistor R5, second potentiometer RP2, sixth resistor R6, and second power supply VCC2 set a second voltage threshold; the above-mentioned second comparator A2 can be an LM358 comparator.

[0089] Further, the auxiliary switch module 7 includes a fifth diode D5, a sixth diode D6, a first switching transistor V1, a second switching transistor V2, a seventh diode D7, and an eighth diode D8;

[0090] Specifically, the anodes of the fifth diode D5 and the sixth diode D6 are respectively connected to the IO5 terminal and the IO6 terminal of the first controller U1. The cathode of the fifth diode D5 is connected to the control terminal of the fourth thyristor S4 and the collector of the first switching transistor V1. The cathode of the sixth diode D6 is connected to the control terminal of the third thyristor S3 and the collector of the second switching transistor V2. The emitter of the first switching transistor V1 is connected to the emitter of the second switching transistor V2 and the ground terminal. The base of the first switching transistor V1 is connected to the base of the second switching transistor V2, the cathode of the seventh diode D7, and the cathode of the eighth diode D8. The anodes of the seventh diode D7 and the eighth diode D8 are respectively connected to the output terminal of the first comparator A1 and the output terminal of the second comparator A2.

[0091] In a specific embodiment, both the first switching transistor V1 and the second switching transistor V2 can be selected as NPN-type triodes.

[0092] In a control system of an IGBT full-bridge series inverter power supply in this embodiment, DC electrical energy is accessed through a power interface, and the first capacitor C1 performs filtering. The first resistor R1 and the second resistor R2 sample the voltage of the DC electrical energy. When the sampled signal is less than the first voltage threshold set by the first power supply VCC1, the third resistor R3, the first potentiometer RP1, and the fourth resistor R4, the first comparator A1 outputs a low level. The IO3 terminal and the IO6 terminal of the first controller U1 simultaneously output the first inverter signal, and the IO4 terminal and the IO5 terminal simultaneously output the second inverter signal, thereby controlling the third power transistor Q3, the sixth power transistor Q6, the fourth power transistor Q4, and the fifth power transistor Q5 to perform inverter operation and output the first AC electrical energy. The voltage transformer and the signal processing device perform voltage sampling, signal amplification filtering, and rectification processing on the first AC electrical energy. When the processed signal is less than the second voltage threshold set by the second power supply VCC2, the fifth resistor R5, the second potentiometer RP2, and the sixth resistor R6, the second comparator A2 outputs a low level. At this time, when the third power transistor Q3 is controlled to conduct at the IO3 terminal of the first inverter, the third thyristor S3 conducts, and the IO2 terminal of the first controller U1 outputs a first pulse signal to control the second power transistor Q2 to conduct, cooperating with the first inductor L1 and the fourth diode D4 to pull down the conduction voltage of the fourth power transistor Q4 and reduce the terminal voltage of the fourth power transistor Q4 to zero, reducing the current change rate of the fourth power transistor Q4, and then performing zero-voltage soft turn-on and zero-current soft turn-on processing on the fourth power transistor Q4. When the first controller U1 controls the fifth power transistor Q5 and the fourth power transistor Q4 to conduct, the fourth thyristor S4 conducts, and the IO1 terminal of the first controller U1 outputs a first pulse signal to control the conduction of the first power transistor Q1, cooperating with the second diode D2 and the first inductor L1 to reduce the terminal voltage change rate of the sixth power transistor Q6 in the off state and perform zero-voltage soft turn-off processing, thereby reducing the switching loss of the inverter output module 4 and improving the power conversion efficiency. If the sampled DC electrical energy is less than the first voltage threshold, it means that the input electrical energy cannot meet the requirements, or the output first AC electrical energy is lower than the second voltage threshold, which means that the output electrical energy cannot meet the demand. The first comparator A1 outputs a high level, that is, the first detection signal, and the second comparator A2 outputs a high level, that is, the second detection signal, both of which will control the second thyristor S2, the first thyristor S1, the fifth thyristor S5, the sixth thyristor S6, the first switching transistor V1, and the second switching transistor V2 to conduct, and the third thyristor S3 and the fourth thyristor S4 to cut off, so that the first pulse signal output by the first controller U1 controls the first power transistor Q1 and the second power transistor Q2 to cooperate with the third capacitor C3 and the fourth capacitor C4 to perform half-bridge inverter operation and output the second AC electrical energy. The second AC electrical energy is superimposed on the first AC electrical energy through the first transformer B1 and outputs the third AC electrical energy, or the voltage of the first AC electrical energy is compensated by adjusting the voltage of the second AC electrical energy. After filtering through the second capacitor C2 and the second inductor L2, it is transmitted to the output port.

[0093] It is obvious to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims concerned.

[0094] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An IGBT full-bridge series inverter power supply control system, characterized in that: The system includes: A detection module is connected to the power module and the inverter output module, and is used to perform voltage sampling on the DC power connected to the power module and compare the voltage with a first voltage threshold, and perform voltage sampling on the inverter output module and compare the voltage with a second voltage threshold; an intelligent control module connected to the detection module and the inverter output module, and used to control the inverter output module to perform an inverter operation, and when the detection module samples the voltage of the power module and the output voltage is greater than a first voltage threshold or when the voltage of the inverter output module is sampled and the output voltage is less than a second voltage threshold, control the soft switch module to adjust the switch voltage and current of the inverter output module, and when the detection module samples the voltage of the power module and the output voltage is less than the first voltage threshold or when the voltage of the inverter output module is sampled and the output voltage is less than the second voltage threshold, control the power transmission state of the soft switch module; The inverter output module is connected to the power module and is used to invert the DC power, filter the inverted power or the superimposed power and output it; The soft switch module is connected to the power module, the inverter output module and the intelligent control module, and is used to transmit electric energy, reduce the terminal voltage and current change rate of the unopened switch elements in the inverter output module and perform zero-voltage soft opening and zero-current soft opening, reduce the terminal voltage change rate of the switch elements in the shutdown state and perform zero-voltage soft shutdown.

2. An IGBT full-bridge series inverter power supply control system according to claim 1, characterized in that: The IGBT full-bridge series inverter power supply control system also includes an auxiliary switch module, an auxiliary capacitor module and a series compensation module; the detection module includes an input detection submodule and an output detection submodule; An input detection submodule, connected to the power module, for sampling the voltage of the DC power connected to the power module and performing a voltage comparison with a first voltage threshold; An output detection submodule, connected to the inverter output module, for sampling the voltage of the inverter output module and performing a voltage comparison with a second voltage threshold; The auxiliary switch module is connected to the output detection submodule, the soft switch module and the input detection submodule, and is used to control the power transmission state of the soft switch module and the inverter output module, and control the soft switch module to stop working when the voltage is less than the first voltage threshold or the second voltage threshold; The auxiliary capacitor module is connected to the power module and the intelligent control module, and is used to receive and store DC power and release the stored power, and cooperate with the series compensation module to perform half-bridge inverter work; The series compensation module is connected to the auxiliary capacitor module, the inverter output module and the soft switch module, and is used to superimpose and output the released electric energy with the electric energy transmitted by the soft switch module, and transmit the superimposed electric energy to the inverter output module.

3. An IGBT full-bridge series inverter power supply control system according to claim 2, characterized in that: The power module includes a power interface and a first capacitor; the inverter output module includes a third power tube, a fourth power tube, a fifth power tube, a sixth power tube, a second capacitor, a second inductor and an output port; the intelligent control module includes a first controller; The first end of the power interface is connected to the first end of the first capacitor, the collector of the third power tube and the collector of the fifth power tube, the emitter of the third power tube is connected to the collector of the fourth power tube and is connected to the first end of the output port through the second capacitor and the second inductor in sequence, the emitter of the fifth power tube is connected to the collector of the sixth power tube, the second end of the output port is connected to the series compensation module, the emitter of the fourth power tube is connected to the emitter of the sixth power tube, the other end of the first capacitor and the second end of the power interface, and the gate of the third power tube, the gate of the fourth power tube, the gate of the fifth power tube and the gate of the sixth power tube are respectively connected to the IO3 end, IO4 end, IO5 end and IO6 end of the first controller.

4. The IGBT full-bridge series inverter power supply control system according to claim 3, characterized in that: The soft switch module includes a third thyristor and a fourth thyristor; The first end of the third thyristor is connected to the emitter of the third power tube, the first end of the fourth thyristor is connected to the emitter of the fifth power tube, the second end of the third thyristor is connected to the second end of the fourth thyristor, and the control end of the third thyristor and the control end of the fourth thyristor are connected to the auxiliary switch module.

5. The IGBT full-bridge series inverter power supply control system according to claim 4, characterized in that: The soft switch module also includes a first power tube, a first diode, a third diode, a fourth diode, a second diode, a second power tube and a first inductor; The collector of the first power tube is connected to the cathode of the third diode and the first end of the power interface, the emitter of the first power tube is connected to the anode of the second diode and the cathode of the first diode, the anode of the third diode is connected to the cathode of the fourth diode and the collector of the second power tube, the anode of the fourth diode is connected to the cathode of the second diode and the first end of the first inductor, the second end of the first inductor is connected to the second end of the third thyristor and the series compensation module, the anode of the first diode is connected to the emitter of the second power tube and the second end of the power interface, and the gate of the first power tube and the gate of the second power tube are respectively connected to the IO1 end and IO2 end of the first controller.

6. The IGBT full-bridge series inverter power supply control system according to claim 5, characterized in that: The soft switch module also includes a second thyristor and a first thyristor; The anode of the second thyristor is connected to the second anode of the third diode and the cathode of the first thyristor, the cathode of the second thyristor is connected to the emitter of the first power tube and the anode of the first thyristor, and the control end of the first thyristor is connected to the control end of the second thyristor and the IO8 end of the first controller.

7. The IGBT full-bridge series inverter power supply control system according to claim 5, characterized in that: The auxiliary capacitor module includes a fifth thyristor, a third capacitor, a fourth capacitor and a sixth thyristor; One end of the fifth thyristor is connected to the first end of the power interface, the other end of the fifth thyristor is connected to the first end of the fourth capacitor and the series compensation module through the third capacitor, the second end of the fourth capacitor is connected to one end of the sixth thyristor, the other end of the sixth thyristor is connected to the second end of the power interface, and the control end of the fifth thyristor is connected to the control end of the sixth thyristor and the IO8 end of the first controller.

8. An IGBT full-bridge series inverter power supply control system according to claim 7, characterized in that: The series compensation module includes a first transformer; The first end and the second end of the primary side of the first transformer are respectively connected to the first end of the fourth capacitor and the second end of the first inductor, and the first end and the second end of the secondary side of the first transformer are respectively connected to the emitter of the fifth power tube and the second end of the output port.

9. The IGBT full-bridge series inverter power supply control system according to claim 6, characterized in that: The output detection submodule includes a voltage transformer, a signal processing device, a second power supply, a fifth resistor, a sixth resistor, a second potentiometer and a second comparator; The first end and the second end of the voltage transformer are connected to the first end and the second end of the output port respectively, the third end and the fourth end of the voltage transformer are connected to the first input end and the second input end of the signal processing device respectively, the output end of the signal processing device is connected to the inverting end of the second comparator, the non-inverting end of the second comparator is connected to the slider end of the second potentiometer, one end of the second potentiometer is connected to the second power supply through the fifth resistor, the other end of the second potentiometer is grounded through the sixth resistor, and the output end of the second comparator is connected to the IO7 end of the first controller and the auxiliary switch module.

10. An IGBT full-bridge series inverter power supply control system according to claim 9, characterized in that: The auxiliary switch module includes a fifth diode, a sixth diode, a first switch tube, a second switch tube, a seventh diode and an eighth diode; The anode of the fifth diode and the anode of the sixth diode are respectively connected to the IO5 terminal and the IO6 terminal of the first controller, the cathode of the fifth diode is connected to the control end of the fourth thyristor and the collector of the first switch tube, the cathode of the sixth diode is connected to the control end of the third thyristor and the collector of the second switch tube, the emitter of the first switch tube is connected to the emitter of the second switch tube and the ground terminal, the base of the first switch tube is connected to the base of the second switch tube, the cathode of the seventh diode and the cathode of the eighth diode, and the anode of the seventh diode and the anode of the eighth diode are respectively connected to the output end of the first comparator and the output end of the second comparator.

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