IGBT full-bridge series inverter power supply control system

Abstract

The invention discloses an IGBT full-bridge series inverter power supply control system, which relates to the technical field of inverter power supplies and comprises an inverter output module, the inverter output module inverts direct-current electric energy accessed by a power supply module, and when the detected electric energy is larger than a first voltage threshold value or smaller than a second voltage threshold value, the inverter output module outputs the inverted electric energy. The intelligent control module controls the soft switching module to carry out zero-voltage and zero-current soft switching-on processing on a switching element which is not switched on in the inversion output module, the terminal voltage change rate of the switching element in a switched-off state is reduced, zero-voltage soft switching-off is carried out, and when the detected electric energy is smaller than a first voltage threshold value or a second voltage threshold value, the soft switching-off is carried out. The soft switch module cooperates with the auxiliary capacitor module to carry out half-bridge inversion and carries out output compensation or enlarges the output voltage range through the electric energy output by the series compensation module and the inversion control module. According to the IGBT full-bridge series inverter power supply control system, the switching loss can be reduced, the electric energy conversion efficiency and the power supply precision are improved, and the power supply voltage range is enlarged.

Description

Technical Field

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

[0002] The IGBT full-bridge series inverter is a power electronic converter topology, which is mainly used to convert DC power into AC power. It is based on the H-bridge circuit structure and consists of four IGBT switching elements, capacitors, inductors and other elements. The IGBT full-bridge series inverter in the prior art is prone to increase IGBT switching losses when subjected to external interference such as electromagnetic interference and radio frequency interference, resulting in reduced power conversion efficiency. In addition, since the IGBT switching element has a certain voltage-bearing capacity, the IGBT full-bridge series inverter has a maximum supply voltage. When the required voltage exceeds the maximum supply voltage, it will not be able to meet the power supply requirements, so it needs to be improved. Summary of the invention

[0003] The 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 technology.

[0004] According to an embodiment of the present invention, an IGBT full-bridge series inverter power supply control system is provided, comprising: 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 voltage is greater than a first voltage threshold or 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 voltage is less than the first voltage threshold or 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.

[0005] As a further solution 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 submodule and an output detection submodule; Preferably, the input detection submodule is connected to the power module and is used to perform voltage sampling on the DC power connected to the power module and perform voltage comparison with the 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.

[0006] As a further solution of the present invention: 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; Preferably, 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.

[0007] As a further solution of the present invention: the soft switch module includes a third thyristor and a fourth thyristor; Preferably, 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.

[0008] As a further solution of the present invention: the soft switch module further 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; Preferably, 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.

[0009] As a further solution of the present invention: the soft switch module further includes a second thyristor and a first thyristor; 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 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.

[0010] As a further solution of the present invention: the auxiliary capacitor module includes a fifth thyristor, a third capacitor, a fourth capacitor and a sixth thyristor; Preferably, 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.

[0011] As a further solution of the present invention: the series compensation module includes a first transformer; 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 tube and the second end of the output port.

[0012] As a further solution of the present invention: the input detection submodule includes a first resistor, a second resistor, a third resistor, a first potentiometer, a fourth resistor, a first comparator and a first power supply; Preferably, the inverting end of the first comparator is connected to one end of the second resistor and connected to the first end of the power interface through the first resistor, the other end of the second resistor is connected to the second end of the power interface, the same phase end of the first comparator is connected to the slider end 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 end of the first comparator is connected to the IO9 end of the first controller and the auxiliary switch module.

[0013] As a further solution of the present invention: 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; 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 end and the second input end of the signal processing device, 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.

[0014] As a further solution of the present invention: 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; Preferably, the anode of the fifth diode and the anode of the sixth diode are respectively connected to the IO5 terminal and 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.

[0015] 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 perform inversion processing on the DC power connected to the power supply module by the inverter output module, and when the DC power is greater than the set first voltage threshold or the power input to the output module is lower than the set second voltage threshold, the intelligent control module will control the soft switch module to perform zero voltage soft opening and zero current soft opening processing on the switch elements that are not turned on in the inverter output module, reduce the terminal voltage change rate of the switch elements in the off state, perform zero voltage soft shutdown processing, reduce the switching loss of the switch elements in the inverter output module, and improve the conversion efficiency of the power. When the DC power is greater than the first voltage threshold or the output voltage is less than the second voltage threshold, the soft switch module cooperates with the auxiliary capacitor module to perform half-bridge inversion processing and superimpose the power output by the series compensation module and the inverter control module, compensate the output power or increase the output voltage range, improve the power supply accuracy and increase the power supply voltage range. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0017] Figure 1 A schematic block diagram of an IGBT full-bridge series inverter power supply control system provided by an embodiment of the present invention.

[0018] Figure 2 A circuit diagram of an IGBT full-bridge series inverter power supply control system provided by an embodiment of the present invention.

[0019] Figure 3 A circuit diagram of an auxiliary capacitor module provided in an embodiment of the present invention.

[0020] Figure 4 A circuit diagram of a series compensation module provided in an embodiment of the present invention.

[0021] Figure 5 A circuit diagram of an input detection submodule provided in an embodiment of the present invention.

[0022] Figure 6 A circuit diagram of an output detection submodule provided in an embodiment of the present invention.

[0023] Figure 7 A circuit diagram of an auxiliary switch module provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In one embodiment, see Figure 1 , an IGBT full-bridge series inverter power supply control system, comprising: A detection module, connected to the power module 1 and the inverter output module 4, for sampling the voltage of the DC power connected to the power module 1 and comparing the voltage with a first voltage threshold, and sampling the voltage of the inverter output module 4 and comparing the voltage with a second voltage threshold; The intelligent control module 3 is connected to the detection module and the inverter output module 4, and is used to control the inverter output module 4 to perform an inverter operation, and when the voltage is greater than a first voltage threshold or less than a second voltage threshold, control the soft switch module 6 to adjust the switch voltage and current of the inverter output module 4, and when the voltage is less than the first voltage threshold or the second voltage threshold, control the power transmission state of the soft switch module 6; The inverter output module 4 is connected to the power module 1 and is used to invert the DC power, filter the inverted power or the superimposed power and output it; The soft switch module 6 is connected to the power module 1, the inverter output module 4 and the intelligent control module 3, and is used to transmit electric energy, reduce the terminal voltage and current change rate of the switching elements that are not turned on in the inverter output module 4 and perform zero-voltage soft turning on and zero-current soft turning on, reduce the terminal voltage change rate of the switching elements that are turned off and perform zero-voltage soft turning off.

[0026] Furthermore, 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 submodule 2 and an output detection submodule 5; Specifically, the input detection submodule 2 is connected to the power module 1 and is used to perform voltage sampling on the DC power connected to the power module 1 and perform voltage comparison with the first voltage threshold; An output detection submodule 5, connected to the inverter output module 4, for sampling the voltage of the inverter output module 4 and performing a voltage comparison with a second voltage threshold; The auxiliary switch module 7 is connected to the output detection submodule 5, the soft switch module 6 and the input detection submodule 2, and is used to control the power transmission state of the soft switch module 6 and the inverter output module 4, and control the soft switch module 6 to stop working when the voltage is less than the first voltage threshold or the second voltage threshold; The auxiliary capacitor module 8 is connected to the power module 1 and the intelligent control module 3, and 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 inverter work; The series compensation module 9 is connected to the auxiliary capacitor module 8 , the inverter output module 4 and the soft switch module 6 , and is used to superimpose and output the released electric energy with the electric energy transmitted by the soft switch module 6 , and transmit the superimposed electric energy to the inverter output module 4 .

[0027] Further performance is: Power module 1, used for receiving direct current power; An input detection submodule 2 is used to perform voltage sampling on the DC power and output a first detection signal when the sampling signal is less than a set first voltage threshold; The intelligent control module 3 is used to output a first inverter signal and a second inverter signal, and output a first pulse signal when the first detection signal is not received or the second detection signal output by the output detection submodule 5 is not received, and output a first control signal and stop outputting the first pulse signal when the first detection signal or the second detection signal is received; The inverter output module 4 is used to invert the DC power and output the first AC power when receiving the first inverter signal or the second inverter signal, superimpose the second AC power output by the series compensation module 9 with the first AC power and output the third AC power, and filter and output the first AC power or the third AC power; The output detection submodule 5 is used to perform voltage sampling on the first AC power and amplify, filter and rectify the sampled signal, and output a second detection signal when the processed signal is less than a set second voltage threshold; The soft switch module 6 is used to receive direct current power. When receiving the first pulse signal and the second control signal or the third control signal output by the auxiliary switch module 7, the terminal voltage of the switch element that is not turned on of the inverter output module 4 is reduced to zero and the current change rate of the switch element that is not turned on is reduced, and the switch element that is not turned on is processed with zero voltage soft switching and zero current soft switching. When the switch element of the inverter output module 4 is turned off, the terminal voltage change rate of the switch element that is turned off is reduced, and a zero voltage soft switching process is performed. When receiving the first control signal, power transmission control is performed and the first power is provided; The auxiliary switch module 7 is used to output the second control signal when receiving the first inversion signal, output the third control signal when receiving the second inversion signal, and stop outputting the second control signal and the third control signal when receiving the first detection signal or the second detection signal; The auxiliary capacitor module 8 is used to receive direct current power, store and discharge the power and provide the second power when receiving the first control signal; The series compensation module 9 is used to receive the first electric energy and the second electric energy and to output the second AC electric energy in isolation.

[0028] In a specific embodiment, the power supply module 1 can adopt a power supply circuit composed of a power supply interface and a capacitor, which can be connected to DC power and filter; the input detection submodule 2 can adopt an input detection circuit composed of a resistor, a comparator, a potentiometer, etc., which can sample the voltage of the DC power and compare the sampled signal with the voltage of the set first voltage threshold, which is the required input voltage; the intelligent control module 3 can adopt an intelligent control circuit composed of a single-chip microcomputer, which integrates many components such as an operator, a controller, a memory, and an input and output device to realize signal processing, data storage, module control, timing control and other functions; the inverter output module 4 can adopt an inverter output circuit composed of four groups of IGBTs, capacitors, inductors and output ports, which can perform inverter regulation and power filtering processing on the input DC power and output power; the output detection submodule 5 can adopt an output detection circuit composed of a voltage transformer, a signal processing device, a comparator, etc., which can sample the voltage of the power output of the inverter output module 4, amplify, filter and rectify the sampled signal, compare the processed signal with the voltage of the set second voltage threshold, The second voltage threshold is the required output voltage; the soft switch module 6 can adopt a soft switch circuit composed of IGBT, diode, thyristor, inductor, 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 of the inverter output module 4 is turned off, the terminal voltage change rate of the switch element that is turned off is reduced; the auxiliary switch module 7 can adopt an auxiliary switch circuit composed of a transistor and a diode, and can control the soft switch module according to the first inverter signal and the second inverter signal output by the intelligent control module 3. 6 and the conduction state of the inverter output module 4, and when receiving the signal output by the input detection submodule 2 or the output detection submodule 5, the soft switch module 6 stops working; the auxiliary capacitor module 8 can adopt an auxiliary capacitor circuit composed of thyristors and capacitors, which can store and discharge energy, and cooperate with the series compensation module 9 and the soft switch module 6 to perform half-bridge inverter processing; the series compensation module 9 can adopt a series compensation circuit composed of a coupling transformer, which can superimpose the electric energy output by the half-bridge inverter with the electric energy output by the inverter output module 4, thereby realizing electric energy compensation and expanding the voltage range.

[0029] In another embodiment, see Figure 1 , Figure 2 , Figure 3 and Figure 4 The power module 1 includes a power interface and a first capacitor C1; the inverter output module 4 includes a third power tube Q3, a fourth power tube Q4, a fifth power tube Q5, a sixth power tube Q6, a second capacitor C2, a second inductor L2 and an output port; the intelligent control module 3 includes a first controller U1; 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 tube Q3 and the collector of the fifth power tube Q5, the emitter of the third power tube Q3 is connected to the collector of the fourth power tube Q4 and is connected to the first end of the output port through the second capacitor C2 and the second inductor L2 in sequence, the emitter of the fifth power tube Q5 is connected to the collector of the sixth power tube Q6, the second end of the output port is connected to the series compensation module 9, the emitter of the fourth power tube Q4 is connected to the emitter of the sixth power tube Q6, the other end of the first capacitor C1 and the second end of the power interface, and the gate of the third power tube Q3, the gate of the fourth power tube Q4, the gate of the fifth power tube Q5 and the gate of the sixth power tube Q6 are respectively connected to the IO3 end, IO4 end, IO5 end and IO6 end of the first controller U1.

[0030] In a specific embodiment, the third power tube Q3, the fourth power tube Q4, the fifth power tube Q5 and the sixth power tube Q6 can all be N-channel field effect tubes with capacitors and parasitic diodes; the first controller U1 can be an STM32 single-chip microcomputer.

[0031] Further, the soft switch module 6 includes a third thyristor S3 and a fourth thyristor S4; Specifically, the first end of the third thyristor S3 is connected to the emitter of the third power tube Q3, the first end of the fourth thyristor S4 is connected to the emitter of the fifth power tube Q5, the second end of the third thyristor S3 is connected to the second end of the fourth thyristor S4, and the control end of the third thyristor S3 and the control end of the fourth thyristor S4 are connected to the auxiliary switch module 7.

[0032] In a specific embodiment, the third thyristor S3 and the fourth thyristor S4 can both be bidirectional thyristors.

[0033] Furthermore, the soft switch module 6 also includes a first power tube Q1, a first diode D1, a third diode D3, a fourth diode D4, a second diode D2, a second power tube Q2 and a first inductor L1; Specifically, the collector of the first power tube 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 tube 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 tube 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 tube Q2 and the second end of the power interface, and the gate of the first power tube Q1 and the gate of the second power tube Q2 are respectively connected to the IO1 end and IO2 end of the first controller U1.

[0034] In a specific embodiment, both the first power tube Q1 and the second power tube Q2 can be N-channel field effect tubes with parasitic diodes.

[0035] Furthermore, the soft switch module 6 also includes a second thyristor S2 and a first thyristor S1; Specifically, the anode of the second thyristor S2 is connected to the second 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 tube Q1 and the anode of the first thyristor S1, and the control end of the first thyristor S1 is connected to the control end of the second thyristor S2 and the IO8 end of the first controller U1.

[0036] In a specific embodiment, both the first thyristor S1 and the second thyristor S2 can be unidirectional thyristors.

[0037] Further, the auxiliary capacitor module 8 includes a fifth thyristor S5, a third capacitor C3, a fourth capacitor C4 and a sixth thyristor S6; Specifically, one end of the fifth thyristor S5 is connected to the first end of the power 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 interface, and the control end of the fifth thyristor S5 is connected to the control end of the sixth thyristor S6 and the IO8 end of the first controller U1.

[0038] In a specific embodiment, the fifth thyristor S5 and the sixth thyristor S6 can both be bidirectional thyristors; the third capacitor C3 and the fourth capacitor C4 can both be energy storage capacitors.

[0039] Further, the series compensation module 9 includes a first transformer B1; Specifically, the first and second ends 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 and second ends of the secondary side of the first transformer B1 are respectively connected to the emitter of the fifth power tube Q5 and the second end of the output port.

[0040] In a specific embodiment, the first transformer B1 may be a coupling transformer.

[0041] In another embodiment, see Figure 1 , Figure 2 , Figure 5 , Figure 6 and Figure 7 , the input detection submodule 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; Specifically, the inverting end of the first comparator A1 is connected to one end of the second resistor R2 and is connected to the first end of the power interface through the first resistor R1, the other end of the second resistor R2 is connected to the second end of the power interface, the inverting end of the first comparator A1 is connected to the slider end 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, the other end of the first potentiometer RP1 is grounded through the fourth resistor R4, and the output end of the first comparator A1 is connected to the IO9 end of the first controller U1 and the auxiliary switch module 7.

[0042] In a specific embodiment, the first resistor R1 and the second resistor R2 perform voltage sampling; the first power supply VCC1, the third resistor R3, the first potentiometer RP1 and the fourth resistor R4 set the first voltage threshold; the first comparator A1 can use an LM358 comparator.

[0043] Further, the output detection submodule 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; 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 end and the second input end of the signal processing device, the output end of the signal processing device is connected to the inverting end of the second comparator A2, the non-inverting end of the second comparator A2 is connected to the slider end 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, the other end of the second potentiometer RP2 is grounded through the sixth resistor R6, and the output end of the second comparator A2 is connected to the IO7 end of the first controller U1 and the auxiliary switch module 7.

[0044] In a specific embodiment, the signal processing device may be composed of a signal amplification and filtering circuit and a rectifier composed of an operational amplifier, a capacitor and a resistor; the fifth resistor R5, the second potentiometer RP2, the sixth resistor R6 and the second power supply VCC2 set the second voltage threshold; the second comparator A2 may use an LM358 comparator.

[0045] Further, the auxiliary switch module 7 includes a fifth diode D5, a sixth diode D6, a first switch tube V1, a second switch tube V2, a seventh diode D7 and an eighth diode D8; Specifically, the anode of the fifth diode D5 and the anode of 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 end of the fourth thyristor S4 and the collector of the first switch tube V1, the cathode of the sixth diode D6 is connected to the control end of the third thyristor S3 and the collector of the second switch tube V2, the emitter of the first switch tube V1 is connected to the emitter of the second switch tube V2 and the ground terminal, the base of the first switch tube V1 is connected to the base of the second switch tube V2, the cathode of the seventh diode D7 and the cathode of the eighth diode D8, and the anode of the seventh diode D7 and the anode of the eighth diode D8 are respectively connected to the output end of the first comparator A1 and the output end of the second comparator A2.

[0046] In a specific embodiment, both the first switch tube V1 and the second switch tube V2 can be selected from NPN transistors.

[0047] In an IGBT full-bridge series inverter power supply control system of the present embodiment, DC power is connected by a power supply interface, a first capacitor C1 performs filtering processing, a first resistor R1 and a second resistor R2 perform voltage sampling on the DC power, when the sampled signal is less than a 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 and IO6 terminals of the first controller U1 simultaneously output a first inverter signal, the IO4 and IO5 terminals simultaneously output a second inverter signal, and then the third power tube Q3, the sixth power tube Q6, the fourth power tube Q4 and the fifth power tube Q5 are controlled to perform inverter work and output the first AC power, the voltage transformer and the signal processing device The first AC electric energy is subjected to voltage sampling, signal amplification, filtering and rectification processing. 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 tube Q3 is controlled to be turned on at the IO3 end of the first inverter, the third thyristor S3 is turned on, and the IO2 end of the first controller U1 outputs a first pulse signal to control the second power tube Q2 to be turned on, and cooperates with the first inductor L1 and the fourth diode D4 to lower the turn-on voltage of the fourth power tube Q4, and reduces the terminal voltage of the fourth power tube Q4 to zero, reduces the current change rate of the fourth power tube Q4, and then performs zero voltage soft opening and zero current soft opening on the fourth power tube Q4. When the first controller U1 controls the fifth power tube Q5 and the fourth power tube Q4 to be turned on, the fourth thyristor S4 is turned on, and the IO1 terminal of the first controller U1 outputs a first pulse signal to control the conduction of the first power tube Q1, and cooperates with the second diode D2 and the first inductor L1 to reduce the terminal voltage change rate of the sixth power tube Q6 in the shutdown state, and performs zero voltage soft shutdown processing, thereby reducing the switching loss of the inverter output module 4 and improving the power conversion efficiency. If the sampled DC power is less than the first voltage threshold, it means that the input power cannot meet the requirements, or the output first AC power is lower than the second voltage threshold, it means that the output power cannot meet the requirements, the first comparator A1 outputs a high level, that is, the first detection signal, and the second comparator A2 outputs a high level. The second detection signal, that is, the second thyristor S2, the first thyristor S1, the fifth thyristor S5, the sixth thyristor S6, the first switch tube V1 and the second switch tube V2 are turned on, and the third thyristor S3 and the fourth thyristor S4 are turned off, so that the first pulse signal output by the first controller U1 controls the first power tube Q1 and the second power tube Q2 to cooperate with the third capacitor C3 and the fourth capacitor C4 to perform half-bridge inverter work and output the second AC power. The second AC power is superimposed with the first AC power through the first transformer B1 and outputs the third AC power, or the voltage of the second AC power is adjusted to achieve voltage compensation processing for the first AC power, and is filtered by the second capacitor C2 and the second inductor L2 before being transmitted to the output port.

[0048] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0049] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes 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 voltage is greater than a first voltage threshold or 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 voltage is less than the first voltage threshold or 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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