A field effect tube safety self-check control circuit

Abstract

The present invention discloses a field effect tube safety self-check control circuit, which relates to the technical field of field effect tubes, and includes a power supply control module for power supply, voltage reduction and electric energy path switching; an intelligent control module for signal reception and module control; a drive control module for improving the driving ability of the signal and controlling the signal transmission state; an inverter output module for inverter regulation; a short circuit detection module connected to the inverter output module for short circuit detection; a self-check control module connected to the intelligent control module and the inverter output module for forming a loop with the inverter output module and controlling the transmission state of electric energy; a fault judgment module for detecting the forward conduction voltage drop state of the inverter output module. The field effect tube safety self-check control circuit of the present invention can perform short circuit detection on two groups of field effect tubes connected in series in the inverter output module, can detect the forward conduction voltage drop state of the inverter output module, and judge whether the body diode of the field effect tube is faulty.

Description

Technical Field

[0001] The invention relates to the technical field of field effect tubes, in particular to a field effect tube safety self-checking control circuit. Background Art

[0002] Field effect transistor is a semiconductor device that uses the electric field effect of the control input loop to control the output loop current. It is widely used in high voltage, high temperature and high operating frequency occasions such as motors, inverters and generators due to its advantages such as high operating temperature, high switching frequency and low conduction loss. In order to ensure the safe working state of the field effect tube, short circuit detection will be performed when it is working. However, the inverter can be composed of two groups, four groups, six groups and other groups of field effect tubes. In order to ensure the safe operation of the field effect tube, each group of field effect tubes will be short-circuit detected separately, which leads to a more complex and costly detection circuit. In addition, the existing field effect tubes generally perform short circuit detection when they are in working state, and cannot automatically perform detection in advance, and cannot automatically determine the working state of the body diode of the field effect tube. There are certain safety hazards when using field effect tubes, so it needs to be improved. Summary of the invention

[0003] The embodiment of the present invention provides a field effect transistor safety self-check control circuit to solve the problems raised in the above background technology.

[0004] According to an embodiment of the present invention, a field effect tube safety self-check control circuit is provided, comprising: a power supply control module, an intelligent control module, a drive control module, an inverter output module, a short circuit detection module, a self-check control module and a fault judgment module;

[0005] A power control module, connected to the inverter output module, the intelligent control module and the self-checking control module, for receiving direct current power and transmitting the direct current power to the inverter output module, and upon receiving the first detection signal output by the intelligent control module, performing voltage reduction processing on the direct current power and providing the first power to the self-checking control module;

[0006] an intelligent control module, connected to the fault judgment module and the short-circuit detection module, and configured to output a first pulse signal, a second pulse signal, a third pulse signal, and a fourth pulse signal; when the first pulse signal, the second pulse signal, the third pulse signal, and the fourth pulse signal are not output, output a first detection signal, and during the period of outputting the first detection signal, cyclically output a first control signal and a second control signal; and receive a first fault signal output by the fault judgment module and a second fault signal output by the short-circuit detection module;

[0007] A drive control module, together with the intelligent control module, the inverter output module, the fault judgment module and the short-circuit detection module, is used to transmit signals and improve the driving capabilities of the first pulse signal, the second pulse signal, the third pulse signal and the fourth pulse signal and control the inverter output module to perform an inverter operation, and stops the signal transmission operation when receiving the first fault signal output by the fault judgment module or the second fault signal output by the short-circuit detection module;

[0008] An inverter output module, used for receiving the first pulse signal, the second pulse signal, the third pulse signal and the fourth pulse signal transmitted by the drive control module and performing inversion processing on the DC power to supply power to the connected electrical equipment;

[0009] A short-circuit detection module is connected to the inverter output module and is used to set a short-circuit threshold value, and when receiving the first pulse signal or the third pulse signal, performs electric energy sampling on the inverter output module and outputs a second fault signal when the sampled signal is greater than the short-circuit threshold value;

[0010] A self-checking control module, connected to the intelligent control module and the inverter output module, for receiving the first electric energy and connecting the inverter output module to the self-checking load, and transmitting the first electric energy to the inverter output module and then transmitting the first electric energy to the self-checking load through the inverter output module when receiving the first control signal or the second control signal;

[0011] A fault judgment module is connected to the self-test control module and the inverter output module, and is used to perform voltage drop processing on the first electric energy transmitted by the self-test control module and output a first fault signal when the electric energy after the voltage drop processing is greater than the first electric energy transmitted by the inverter output module to the self-test load.

[0012] As a further solution of the present invention: the power control module includes a power interface, a first capacitor, a first resistor, a first power tube, a first switch tube, a second power tube, a first diode, a second capacitor, a second diode and a first inductor; the intelligent control module includes a first controller;

[0013] Preferably, the first end of the power interface is connected to the drain of the first power tube, the drain of the second power tube and one end of the first capacitor, and is connected to the gate of the first power tube and the collector of the first switching tube through a first resistor, the base of the first switching tube is connected to the cathode of the first diode and is connected to the emitter of the first switching tube, the anode of the second diode, the other end of the first capacitor, the second end of the power interface and the ground through a second capacitor, the source of the first power tube is connected to the inverter output module, the gate of the second power tube is connected to the anode of the first diode and the IO6 end of the first controller, the source of the second power tube is connected to the cathode of the second diode and the first end of the first inductor, and the second end of the first inductor is connected to the self-test control module.

[0014] As a further solution of the present invention: the inverter output module includes a third power tube, a fourth power tube, a fifth power tube, a sixth power tube, a second inductor, a third inductor and an output port;

[0015] Preferably, the drain of the third power tube is connected to the drain of the sixth power tube and the source of the first power tube, the source of the third power tube is connected to one end of the output port and the drain of the fifth power tube, the source of the fourth power tube is connected to one end of the third inductor, the source of the fifth power tube is connected to the self-test control module and the short-circuit detection module and is connected to the other end of the third inductor and the ground through the second inductor, the sixth power tube is connected to the other end of the output port and the drain of the fourth power tube, 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 all connected to the drive control module.

[0016] As a further solution of the present invention: the drive control module includes a first driver, a second driver, a first analog switch and a first trigger;

[0017] Preferably, the first end, the third end, the eighth end and the tenth end of the first analog switch are respectively connected to the IO1 end, the IO2 end, the IO3 end and the IO4 end of the first controller, the second end and the fourth end of the first analog switch are respectively connected to the first input end and the second input end of the first driver, the ninth end and the eleventh end of the first analog switch are respectively connected to the first input end and the second input end of the second driver, the first output end and the second output end of the first driver are respectively connected to the gate of the third power tube and the gate of the fourth power tube, the first output end and the second output end of the second driver are respectively connected to the gate of the sixth power tube and the gate of the fifth power tube, the twelfth end, the thirteenth end, the fifth end and the sixth end of the first analog switch are all connected to the Q1 end of the first trigger, the D end of the first trigger is grounded, and the CLK end of the first trigger is connected to the short circuit detection module and the fault judgment module.

[0018] As a further solution of the present invention: the short circuit detection module includes a first thyristor, a second thyristor, a second resistor, a third resistor, a third diode, a fourth resistor, a fifth resistor, a first comparator, a threshold device and an eleventh diode;

[0019] Preferably, the anode of the first thyristor is connected to the source of the fifth power tube, the anode of the second thyristor is connected to the source of the fourth power tube, the cathode of the first thyristor is connected to the cathode of the second thyristor and is connected to one end of the third resistor, the cathode of the third diode and one end of the fourth resistor through the second resistor, the other end of the fourth resistor is connected to the in-phase end of the first comparator and is connected to the anode of the third diode, the other end of the third resistor and the ground through the fifth resistor, the inverting end of the first comparator is connected to the threshold device, the output end of the first comparator is connected to the anode of the eleventh diode and the IO9 end of the first controller, the cathode of the eleventh diode is connected to the CLK end of the first trigger, and the control end of the first thyristor and the control end of the second thyristor are respectively connected to the IO3 end and IO1 end of the first controller.

[0020] As a further solution of the present invention: the self-check control module includes a third thyristor, a fourth thyristor, a fourth diode, a fifth diode, a seventh power tube and a first load;

[0021] Preferably, the anode of the third thyristor is connected to the anode of the fourth thyristor and the second end of the first inductor, the cathode of the fourth thyristor is connected to the fault judgment module and the source of the fourth power tube, the cathode of the third thyristor is connected to the source of the fifth power tube, the control end of the third thyristor is connected to the anode of the fourth diode and the IO7 end of the first controller, the control end of the fourth thyristor is connected to the anode of the fifth diode and the IO8 end of the first controller, the cathode of the fourth diode is connected to the cathode of the fifth diode and the gate of the seventh power tube, the source of the seventh power tube is grounded through the first load, and the drain of the seventh power tube is connected to the drain of the third power tube.

[0022] As a further solution of the present invention: the fault judgment module includes a seventh diode, an eighth diode, a ninth diode, a second comparator and a tenth diode;

[0023] Preferably, the anode of the seventh diode is connected to the cathode of the fourth thyristor, the anode of the eighth diode is connected to the cathode of the third thyristor, the cathode of the seventh diode is connected to the cathode of the eighth diode and the anode of the ninth diode, the cathode of the ninth diode is connected to the in-phase terminal of the second comparator, the inverting terminal of the second comparator is connected to the drain of the third power tube, the output terminal of the second comparator is connected to the IO5 terminal of the first controller and the anode of the tenth diode, and the cathode of the tenth diode is connected to the CLK terminal of the first trigger.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows: the field effect tube safety self-check control circuit of the present invention performs short-circuit detection switching in the inverter output module according to the inverter state of the inverter output module by the short-circuit detection module, so as to realize short-circuit detection of two groups of field effect tubes connected in series in the inverter output module, and disconnect the driving work of the drive control module in case of short circuit, and then stop the work of the inverter output module; when the inverter output module is not working, the power supply control module can cooperate with the self-check control module to detect the forward conduction state of the inverter output module, and judge the voltage drop state of the body diode of the field effect tube in the inverter output module according to the fault judgment module, and then judge whether the body diode of the field effect tube is faulty, thereby improving the use safety of the field effect tube in the inverter output module. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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.

[0026] Figure 1 A schematic block diagram of a field effect transistor safety self-check control circuit provided by an embodiment of the present invention.

[0027] Figure 2 A circuit diagram of a field effect transistor safety self-check control circuit provided by an embodiment of the present invention.

[0028] Figure 3 A circuit diagram of a self-check control module provided in an embodiment of the present invention.

[0029] Figure 4 A circuit diagram of a fault judgment module provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] 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.

[0031] In one embodiment, see Figure 1 , a field effect tube safety self-check control circuit, comprising: a power control module 1, an intelligent control module 2, a drive control module 3, an inverter output module 4, a short circuit detection module 5, a self-check control module 6 and a fault judgment module 7;

[0032] Specifically, the power control module 1 is connected to the inverter output module 4, the intelligent control module 2 and the self-checking control module 6, and is used to access the DC power and transmit the DC power to the inverter output module 4, and when receiving the first detection signal output by the intelligent control module 2, it steps down the DC power and provides the first power to the self-checking control module 6;

[0033] The intelligent control module 2 is connected to the fault judgment module 7 and the short-circuit detection module 5, and is used to output a first pulse signal, a second pulse signal, a third pulse signal and a fourth pulse signal. When the first pulse signal, the second pulse signal, the third pulse signal and the fourth pulse signal are not output, the intelligent control module 2 outputs a first detection signal and cyclically outputs a first control signal and a second control signal during the period of outputting the first detection signal, and receives a first fault signal output by the fault judgment module 7 and a second fault signal output by the short-circuit detection module 5;

[0034] The drive control module 3, together with the intelligent control module 2, the inverter output module 4, the fault judgment module 7 and the short-circuit detection module 5, is used to transmit signals and improve the driving capabilities of the first pulse signal, the second pulse signal, the third pulse signal and the fourth pulse signal and control the inverter output module 4 to perform the inverter operation, and when receiving the first fault signal output by the fault judgment module 7 or the second fault signal output by the short-circuit detection module 5, the signal transmission operation is stopped;

[0035] The inverter output module 4 is used to receive the first pulse signal, the second pulse signal, the third pulse signal and the fourth pulse signal transmitted by the drive control module 3 and perform inversion processing on the DC power to supply power to the connected electrical equipment;

[0036] The short-circuit detection module 5 is connected to the inverter output module 4 and is used to set a short-circuit threshold value, and when receiving the first pulse signal or the third pulse signal, performs electric energy sampling on the inverter output module 4 and outputs a second fault signal when the sampled signal is greater than the short-circuit threshold value;

[0037] A self-test control module 6, connected to the intelligent control module 2 and the inverter output module 4, for receiving the first electric energy and connecting the inverter output module 4 to the self-test load, and transmitting the first electric energy to the inverter output module 4 and then transmitting the first electric energy to the self-test load through the inverter output module 4 when receiving the first control signal or the second control signal;

[0038] The fault judgment module 7 is connected to the self-test control module 6 and the inverter output module 4, and is used to perform voltage drop processing on the first electric energy transmitted by the self-test control module 6 and output a first fault signal when the electric energy after the voltage drop processing is greater than the first electric energy transmitted by the inverter output module 4 to the self-test load.

[0039] In a specific embodiment, the power control module 1 can adopt a power control circuit composed of a power interface, a field effect transistor, a triode, an inductor, etc., which can be connected to DC power and supply power, and perform voltage reduction when controlled by the intelligent control module 2 and the power supply is switched; the intelligent control module 2 can 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 and output device to realize signal processing, data storage, module control, timing control and other functions; the drive control module 3 can adopt a drive control circuit composed of a field effect transistor driver, an analog switch and a D trigger, which can improve the driving ability of the pulse signal output by the intelligent control module 2, and drive the inverter output module 4 to work, and stop the driving work in the event of a short circuit fault or a forward conduction voltage drop fault; the inverter output module 4 can adopt an inverter output circuit composed of four groups of field effect transistors, an inductor and an output port, which can input The DC power is inverted and the inverted power is transmitted to the connected electrical equipment through the output port; the short-circuit detection module 5 can adopt a short-circuit detection circuit composed of a thyristor, a resistor, a comparator, etc., and a short-circuit threshold can be set. The short-circuit threshold is the breakdown voltage of the field effect tube. When the inverter output module 4 is working, the field effect tubes in series are sampled for power and short-circuit judgment is processed; the self-check control module 6 can adopt a self-check control circuit composed of a diode, a thyristor, a power tube, and a load. When the self-check is working, it can form a power supply circuit with the inverter output module 4, and then forward power is supplied to the body diode of the field effect tube in the inverter output module 4; the fault judgment module 7 can adopt a fault judgment circuit composed of a diode and a comparator, and can perform voltage drop processing on the power transmitted by the self-check control module 6, and then judge whether the voltage drop of the body diode of the series field effect tube is not equal to the normal voltage drop range when the inverter output module 4 is not in the inversion state.

[0040] In another embodiment, see Figure 1 , Figure 2 , Figure 3 and Figure 4 The power control module 1 includes a power interface, a first capacitor C1, a first resistor R1, a first power tube Q1, a first switch tube V1, a second power tube Q2, a first diode D1, a second capacitor C2, a second diode D2 and a first inductor L1; the intelligent control module 2 includes a first controller U1;

[0041] Specifically, the first end of the power interface is connected to the drain of the first power tube Q1, the drain of the second power tube Q2 and one end of the first capacitor C1, and is connected to the gate of the first power tube Q1 and the collector of the first switch tube V1 through the first resistor R1. The base of the first switch tube V1 is connected to the cathode of the first diode D1 and is connected to the emitter of the first switch tube V1, the anode of the second diode D2, the other end of the first capacitor C1, the second end of the power interface and the ground through the second capacitor C2. The source of the first power tube Q1 is connected to the inverter output module 4, the gate of the second power tube Q2 is connected to the anode of the first diode D1 and the IO6 end of the first controller U1, the source of the second power tube Q2 is connected to the cathode of the second diode D2 and the first end of the first inductor L1, and the second end of the first inductor L1 is connected to the self-test control module 6.

[0042] In a specific embodiment, both the first power tube Q1 and the second power tube Q2 can be N-channel field effect tubes. The first power tube Q1 supplies power to the inverter output module 4, and the second power tube Q2 cooperates with the second diode D2 and the first inductor L1 to perform voltage reduction. The first switch tube V1 can be an NPN transistor. The first controller U1 can be an STM32 microcontroller.

[0043] Further, 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 inductor L2, a third inductor L3 and an output port;

[0044] Specifically, the drain of the third power tube Q3 is connected to the drain of the sixth power tube Q6 and the source of the first power tube Q1, the source of the third power tube Q3 is connected to one end of the output port and the drain of the fifth power tube Q5, the source of the fourth power tube Q4 is connected to one end of the third inductor L3, the source of the fifth power tube Q5 is connected to the self-test control module 6 and the short-circuit detection module 5 and is connected to the other end of the third inductor L3 and the ground through the second inductor L2, the sixth power tube Q6 is connected to the other end of the output port and the drain of the fourth power tube Q4, 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 all connected to the drive control module 3.

[0045] 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 for inverter operation. During inverter operation, the third power tube Q3 and the fourth power tube Q4 are connected in series, and the sixth power tube Q6 and the fifth power tube Q5 are connected in series. When inverter operation is not performed, the third power tube Q3 and the fifth power tube Q5 are connected in series, and the sixth power tube Q6 and the fourth power tube Q4 are connected in series.

[0046] Furthermore, the driving control module 3 includes a first driver, a second driver, a first analog switch IC1 and a first trigger U2;

[0047] Specifically, the first end, the third end, the eighth end and the tenth end of the first analog switch IC1 are respectively connected to the IO1 end, the IO2 end, the IO3 end and the IO4 end of the first controller U1, the second end and the fourth end of the first analog switch IC1 are respectively connected to the first input end and the second input end of the first driver, the ninth end and the eleventh end of the first analog switch IC1 are respectively connected to the first input end and the second input end of the second driver, the first output end and the second output end of the first driver are respectively connected to the gate of the third power tube Q3 and the gate of the fourth power tube Q4, the first output end and the second output end of the second driver are respectively connected to the gate of the sixth power tube Q6 and the gate of the fifth power tube Q5, the twelfth end, the thirteenth end, the fifth end and the sixth end of the first analog switch IC1 are all connected to the Q1 end of the first trigger U2, the D end of the first trigger U2 is grounded, and the CLK end of the first trigger U2 is connected to the short circuit detection module 5 and the fault judgment module 7.

[0048] In a specific embodiment, the first driver and the second driver can both use IR2110 driver; the first analog switch IC1 can use CD4066 chip; the first trigger U2 can use D trigger.

[0049] Further, the short circuit detection module 5 includes a first thyristor S1, a second thyristor S2, a second resistor R2, a third resistor R3, a third diode D3, a fourth resistor R4, a fifth resistor R5, a first comparator A1, a threshold device and an eleventh diode D11;

[0050] Specifically, the anode of the first thyristor S1 is connected to the source of the fifth power tube Q5, the anode of the second thyristor S2 is connected to the source of the fourth power tube Q4, the cathode of the first thyristor S1 is connected to the cathode of the second thyristor S2 and connected to one end of the third resistor R3, the cathode of the third diode D3 and one end of the fourth resistor R4 through the second resistor R2, the other end of the fourth resistor R4 is connected to the in-phase end of the first comparator A1 and connected to the anode of the third diode D3, the other end of the third resistor R3 and the ground through the fifth resistor R5, the inverting end of the first comparator A1 is connected to the threshold device, the output end of the first comparator A1 is connected to the anode of the eleventh diode D11 and the IO9 end of the first controller U1, the cathode of the eleventh diode D11 is connected to the CLK end of the first trigger U2, and the control end of the first thyristor S1 and the control end of the second thyristor S2 are respectively connected to the IO3 end and the IO1 end of the first controller U1.

[0051] In a specific embodiment, the first thyristor S1 and the second thyristor S2 can both be unidirectional thyristors; the threshold device can be composed of a reference power supply to provide a short-circuit threshold; the first comparator A1 can be a LM358 comparator.

[0052] Further, the self-check control module 6 includes a third thyristor S3, a fourth thyristor D4, a fourth diode D4, a fifth diode D5, a seventh power tube Q7 and a first load RL1;

[0053] Specifically, the anode of the third thyristor S3 is connected to the anode of the fourth thyristor D4 and the second end of the first inductor L1, the cathode of the fourth thyristor D4 is connected to the fault judgment module 7 and the source of the fourth power tube Q4, the cathode of the third thyristor S3 is connected to the source of the fifth power tube Q5, the control end of the third thyristor S3 is connected to the anode of the fourth diode D4 and the IO7 end of the first controller U1, the control end of the fourth thyristor D4 is connected to the anode of the fifth diode D5 and the IO8 end of the first controller U1, the cathode of the fourth diode D4 is connected to the cathode of the fifth diode D5 and the gate of the seventh power tube Q7, the source of the seventh power tube Q7 is grounded through the first load RL1, and the drain of the seventh power tube Q7 is connected to the drain of the third power tube Q3.

[0054] In a specific embodiment, the third thyristor S3 and the fourth thyristor D4 can be unidirectional thyristors; the seventh power tube Q7 can be an N-channel field effect tube.

[0055] Further, the fault judgment module 7 includes a seventh diode D7, an eighth diode D8, a ninth diode D9, a second comparator A2 and a tenth diode D10;

[0056] Specifically, the anode of the seventh diode D7 is connected to the cathode of the fourth thyristor D4, the anode of the eighth diode D8 is connected to the cathode of the third thyristor S3, the cathode of the seventh diode D7 is connected to the cathode of the eighth diode D8 and the anode of the ninth diode D9, the cathode of the ninth diode D9 is connected to the in-phase terminal of the second comparator A2, the inverting terminal of the second comparator A2 is connected to the drain of the third power tube Q3, the output terminal of the second comparator A2 is connected to the IO5 terminal of the first controller U1 and the anode of the tenth diode D10, and the cathode of the tenth diode D10 is connected to the CLK terminal of the first trigger U2.

[0057] In a specific embodiment, the seventh diode D7 and the ninth resistor perform a voltage drop processing on the input electric energy, the eighth diode D8 and the ninth diode D9 perform a voltage drop processing on the input electric energy, and the voltage after the voltage drop is equal to the voltage after the body diode voltage drop of the two groups of field effect transistors under normal conditions; the second comparator A2 can select an LM358 comparator.

[0058] In a field effect tube safety self-check control circuit of the present embodiment, direct current power is connected by a power interface, a first capacitor C1 performs filtering, a first resistor R1 triggers the first power tube Q1 to turn on, and supplies power to the inverter output module 4, and at the same time, the IO1 terminal, IO2 terminal, IO3 terminal and IO4 terminal of the first controller U1 respectively provide a first pulse signal, a second pulse signal, a third pulse signal and a fourth pulse signal. Since the CLK terminal of the first trigger U2 is at a low level, the Q1 terminal of the first trigger U2 outputs a high level, triggering the first analog switch IC1 to transmit a signal. After the first pulse signal and the second pulse signal are processed by the first driver, they drive the conduction state of the third power tube Q3 and the fourth power tube Q4 respectively. Similarly, the third pulse signal After being processed, the fourth pulse signal drives the conduction state of the sixth power tube Q6 and the fifth power tube Q5 respectively, and then performs the inverter work. At the same time, when the first controller U1 outputs the first pulse signal, the second thyristor S2 is turned on, and cooperates with the third inductor L3, the second resistor R2, the third resistor R3, the third diode D3, the fourth resistor R4 and the fifth resistor R5 to sample the electric energy when the third power tube Q3, the output port and the fourth power tube Q4 are connected in series. When the sampling signal is greater than the short-circuit threshold provided by the threshold device, the first comparator A1 outputs a high level, and then the Q1 end of the first trigger U2 outputs a low level, and the first analog switch IC1 stops signal transmission. Similarly, when the first controller U1 outputs the third pulse signal, the first thyristor S 1 is turned on, and a short-circuit detection is performed on the electric energy when the sixth power tube Q6, the output port and the fifth power tube Q5 are connected in series. When a short circuit occurs, the inverter operation is stopped. When the first pulse signal, the second pulse signal, the third pulse signal and the fourth pulse signal are not output, the IO6 end of the first controller U1 can control the first switch tube V1 to be turned on, control the second power tube Q2 to be turned on and cooperate with the first inductor L1 and the second diode D2 to perform a voltage reduction process. At the same time, the IO7 end and the IO8 end of the first controller U1 cyclically output the first control signal and the second control signal, and then cyclically control the third thyristor S3 and the seventh power tube Q7 to be turned on together, the fourth thyristor D4 and the seventh power tube Q7 to be turned on together, and the first load RL1 is connected with the third power tube Q3 and the sixth power tube Q7. The third thyristor S3 is connected to the fifth power tube Q5, the third power tube Q3, the seventh power tube Q7 and the first load RL1. The electric energy after the voltage reduction passes through the body diode of the fifth power tube Q5, the body diode of the third power tube Q3, the seventh power tube Q7 and the first load RL1 in sequence. The electric energy transmitted by the third thyristor S3 is compared by the second comparator A2 after the voltage reduction passes through the eighth diode D8 and the ninth diode D9. When the second comparator A2 outputs a high level, it indicates that the voltage drop of the body diode of the fifth power tube Q5 or the body diode of the third power tube Q3 increases. At this time, the body diode of the fifth power tube Q5 or the body diode of the third power tube Q3 fails. The second comparator A2 controls the Q1 end of the first trigger U2 to become a low level, so that the first analog switch IC1 cannot transmit signals.Prevent the first controller U1 from driving the inverter output module 4 to work. Similarly, when the fourth thyristor D4 is turned on, the first load RL1 is connected to determine whether the body diode of the fourth power tube Q4 and the body diode of the sixth power tube Q6 are abnormal. If they are abnormal, the signal transmission work of the first analog switch IC1 is stopped.

[0059] 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.

[0060] 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. A field effect transistor safety self-check control circuit, characterized in that: The field effect tube safety self-check control circuit includes: a power control module, an intelligent control module, a drive control module, an inverter output module, a short circuit detection module, a self-check control module and a fault judgment module; The power control module is connected to the inverter output module, the intelligent control module and the self-checking control module, and is used to receive direct current power and transmit the direct current power to the inverter output module, and when receiving the first detection signal output by the intelligent control module, it performs voltage reduction processing on the direct current power and provides the first power to the self-checking control module; The intelligent control module is connected to the fault judgment module and the short-circuit detection module, and is used to output a first pulse signal, a second pulse signal, a third pulse signal, and a fourth pulse signal. When the first pulse signal, the second pulse signal, the third pulse signal, and the fourth pulse signal are not output, the intelligent control module outputs a first detection signal and cyclically outputs a first control signal and a second control signal during the period of outputting the first detection signal, and receives a first fault signal output by the fault judgment module and a second fault signal output by the short-circuit detection module; The drive control module, together with the intelligent control module, the inverter output module, the fault judgment module and the short-circuit detection module, is used to transmit signals and improve the driving capabilities of the first pulse signal, the second pulse signal, the third pulse signal and the fourth pulse signal and control the inverter output module to perform the inverter operation, and stops the signal transmission operation when receiving the first fault signal output by the fault judgment module or the second fault signal output by the short-circuit detection module; The inverter output module is used to receive the first pulse signal, the second pulse signal, the third pulse signal and the fourth pulse signal transmitted by the drive control module and perform inversion processing on the DC power to supply power to the connected electrical equipment; The short-circuit detection module is connected to the inverter output module, and is used to set a short-circuit threshold, and when receiving the first pulse signal or the third pulse signal, performs electric energy sampling on the inverter output module and outputs a second fault signal when the sampled signal is greater than the short-circuit threshold; The self-test control module is connected to the intelligent control module and the inverter output module, and is used to receive the first electric energy and connect the inverter output module to the self-test load, and when receiving the first control signal or the second control signal, transmit the first electric energy to the inverter output module and transmit the first electric energy to the self-test load through the inverter output module; The fault judgment module is connected to the self-test control module and the inverter output module, and is used to perform voltage drop processing on the first electric energy transmitted by the self-test control module and output a first fault signal when the electric energy after the voltage drop processing is greater than the first electric energy transmitted by the inverter output module to the self-test load.

2. A field effect transistor safety self-check control circuit according to claim 1, characterized in that: The power control module includes a power interface, a first capacitor, a first resistor, a first power tube, a first switch tube, a second power tube, a first diode, a second capacitor, a second diode and a first inductor; the intelligent control module includes a first controller; The first end of the power interface is connected to the drain of the first power tube, the drain of the second power tube and one end of the first capacitor, and is connected to the gate of the first power tube and the collector of the first switch tube through the first resistor. The base of the first switch tube is connected to the cathode of the first diode and is connected to the emitter of the first switch tube, the anode of the second diode, the other end of the first capacitor, the second end of the power interface and the ground through the second capacitor. The source of the first power tube is connected to the inverter output module, the gate of the second power tube is connected to the anode of the first diode and the IO6 end of the first controller, the source of the second power tube is connected to the cathode of the second diode and the first end of the first inductor, and the second end of the first inductor is connected to the self-test control module.

3. A field effect transistor safety self-check control circuit according to claim 2, characterized in that: The inverter output module includes a third power tube, a fourth power tube, a fifth power tube, a sixth power tube, a second inductor, a third inductor and an output port; The drain of the third power tube is connected to the drain of the sixth power tube and the source of the first power tube, the source of the third power tube is connected to one end of the output port and the drain of the fifth power tube, the source of the fourth power tube is connected to one end of the third inductor, the source of the fifth power tube is connected to the self-check control module and the short-circuit detection module and is connected to the other end of the third inductor and the ground through the second inductor, the sixth power tube is connected to the other end of the output port and the drain of the fourth power tube, and the gates of the third power tube, the fourth power tube, the fifth power tube and the sixth power tube are all connected to the drive control module.

4. A field effect transistor safety self-check control circuit according to claim 3, characterized in that: The drive control module includes a first driver, a second driver, a first analog switch and a first trigger; The first end, the third end, the eighth end and the tenth end of the first analog switch are respectively connected to the IO1 end, the IO2 end, the IO3 end and the IO4 end of the first controller, the second end and the fourth end of the first analog switch are respectively connected to the first input end and the second input end of the first driver, the ninth end and the eleventh end of the first analog switch are respectively connected to the first input end and the second input end of the second driver, the first output end and the second output end of the first driver are respectively connected to the gate of the third power tube and the gate of the fourth power tube, the first output end and the second output end of the second driver are respectively connected to the gate of the sixth power tube and the gate of the fifth power tube, the twelfth end, the thirteenth end, the fifth end and the sixth end of the first analog switch are all connected to the Q1 end of the first trigger, the D end of the first trigger is grounded, and the CLK end of the first trigger is connected to the short circuit detection module and the fault judgment module.

5. A field effect transistor safety self-check control circuit according to claim 4, characterized in that: The short circuit detection module includes a first thyristor, a second thyristor, a second resistor, a third resistor, a third diode, a fourth resistor, a fifth resistor, a first comparator, a threshold device and an eleventh diode; The anode of the first thyristor is connected to the source of the fifth power tube, the anode of the second thyristor is connected to the source of the fourth power tube, the cathode of the first thyristor is connected to the cathode of the second thyristor and connected to one end of the third resistor, the cathode of the third diode and one end of the fourth resistor through the second resistor, the other end of the fourth resistor is connected to the in-phase end of the first comparator and connected to the anode of the third diode, the other end of the third resistor and the ground through the fifth resistor, the inverting end of the first comparator is connected to the threshold device, the output end of the first comparator is connected to the anode of the eleventh diode and the IO9 end of the first controller, the cathode of the eleventh diode is connected to the CLK end of the first trigger, the control end of the first thyristor and the control end of the second thyristor are respectively connected to the IO3 end and IO1 end of the first controller.

6. A field effect transistor safety self-check control circuit according to claim 4, characterized in that: The self-check control module includes a third thyristor, a fourth thyristor, a fourth diode, a fifth diode, a seventh power tube and a first load; The anode of the third thyristor is connected to the anode of the fourth thyristor and the second end of the first inductor, the cathode of the fourth thyristor is connected to the fault judgment module and the source of the fourth power tube, the cathode of the third thyristor is connected to the source of the fifth power tube, the control end of the third thyristor is connected to the anode of the fourth diode and the IO7 end of the first controller, the control end of the fourth thyristor is connected to the anode of the fifth diode and the IO8 end of the first controller, the cathode of the fourth diode is connected to the cathode of the fifth diode and the gate of the seventh power tube, the source of the seventh power tube is grounded through the first load, and the drain of the seventh power tube is connected to the drain of the third power tube.

7. A field effect transistor safety self-check control circuit according to claim 6, characterized in that: The fault judgment module includes a seventh diode, an eighth diode, a ninth diode, a second comparator and a tenth diode; The anode of the seventh diode is connected to the cathode of the fourth thyristor, the anode of the eighth diode is connected to the cathode of the third thyristor, the cathode of the seventh diode is connected to the cathode of the eighth diode and the anode of the ninth diode, the cathode of the ninth diode is connected to the in-phase end of the second comparator, the inverting end of the second comparator is connected to the drain of the third power tube, the output end of the second comparator is connected to the IO5 end of the first controller and the anode of the tenth diode, and the cathode of the tenth diode is connected to the CLK end of the first trigger.

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