Residual power zero clearing and short circuit protection device for power module function detection

Abstract

The invention relates to a residual electricity zero clearing and short circuit protection device for power module function detection. The residual electricity zero clearing and short circuit protection device comprises a detected power module, a test device connected with the detected power module and used for performing function detection on the detected power module, a power supply, a voltage detection device, a logic protection device and a load output device, the testing device comprises a testing mainboard, a short circuit protection circuit and a discharging circuit, and the short circuit protection circuit is connected with the testing mainboard and the tested power module at the same time and used for protecting the testing mainboard from current impact generated by short circuit of the tested power module; and the discharge circuit is connected with the test mainboard and the tested power module at the same time and is used for quickly consuming residual charges in the test mainboard and the tested power module so as to realize residual electricity zero clearing. The residual electricity zero clearing and short circuit protection device provided by the invention not only improves the detection efficiency of the tested power module, but also saves the discharge time of the test mainboard, and can effectively protect the test mainboard from being burnt out.

Description

Technical Field

[0001] The invention belongs to the technical field of electronic module testing, and in particular relates to a residual power clearing and short-circuit protection device for power module function detection. Background Art

[0002] The power module (Intelligent Power Module, IPM) is a power drive product that combines power electronics and integrated circuit technology. It will be subjected to functional testing during the development process or mass production process, mainly to verify the functional integrity of the module, also known as FCT testing. By writing an automated test program and using software to simulate various input signals, the output responsiveness of the main control board and the transmission quality of digital and analog signals are automatically detected, such as: signal amplitude, frequency, rise time, fall time and other parameters.

[0003] However, the following problems exist when performing functional tests on existing power modules: after the functional test of the power module under test is completed, it is necessary to wait for a discharge time of 5-8 seconds to remove the residual power of the test mainboard before the module under test can be removed. This long discharge time significantly prolongs the test cycle and reduces the overall test efficiency; at the same time, during the test process, if the power module itself has internal circuit problems such as process defects and chip cracks, due to the lack of effective protection devices, when such defective products are directly tested on the test equipment, the high-voltage power supply terminal and the ground terminal of the test circuit will be directly short-circuited, and a huge amount of energy will be generated instantly. This energy impact will not only cause the test mainboard to burn out, but also seriously affect the test efficiency, so that the test mainboard needs to be replaced frequently, which greatly increases the maintenance cost and brings many inconveniences and economic burdens to the production and operation of the enterprise.

[0004] Therefore, the present invention provides a residual power clearing and short-circuit protection device for power module function detection to solve the above technical problems. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to provide a residual power clearing and short-circuit protection device for power module function detection, which not only improves the detection efficiency of the power module under test, but also saves the discharge time of the test mainboard, and can effectively protect the test mainboard from being burned out.

[0006] The present invention provides a residual power clearing and short circuit protection device for power module function detection, which comprises:

[0007] The power module under test;

[0008] A test device, which is connected to the power module under test and is used to perform a functional test on the power module under test; the test device comprises the test mainboard, a short-circuit protection circuit and a discharge circuit, the short-circuit protection circuit is connected to the test mainboard and the power module under test at the same time, and is used to protect the test mainboard from the current shock caused by the short circuit of the power module under test; the discharge circuit is connected to the test mainboard and the power module under test at the same time, and is used to quickly consume the residual charge in the test mainboard and the power module under test to achieve residual charge clearing;

[0009] A power supply, which is connected to the test mainboard, the short-circuit protection circuit and the discharge circuit, and is used to convert the input alternating current into direct current to supply power to the test mainboard, the short-circuit protection circuit and the discharge circuit;

[0010] A voltage detection device, connected to the power module under test, for detecting a voltage value of the power module under test;

[0011] A logic protection device, connected to the voltage detection device, for controlling the on / off of the power supply and the test mainboard, the short-circuit protection circuit and the discharge circuit according to the voltage value of the power module under test;

[0012] A load output device is connected to the power module under test.

[0013] Preferably, the power module under test includes a power module body connected to the voltage detection device, the short-circuit protection circuit, the discharge circuit and the load output device, a power module short-circuit protection device, a bootstrap circuit, an upper bridge arm drive circuit, a single-chip circuit, a fault feedback circuit, a lower bridge arm drive circuit, an overcurrent signal detection circuit, a phase current detection circuit, a power module power supply circuit, a power module motor control circuit, a bus P+ terminal and a bus N- terminal; the power module body has a V B(U) Port, V B(V) Port, V B(W) Port, V S(U) Port, V S(V) Port, V S(W) Port, IN (UH) Port, IN (VH) Port, IN (WH) Port, IN (UL) Port, IN (VL) Port, IN (WL) Port, V F0 port, CSC port, U / V / W three-phase terminal, N U / N V / N WThe first end of the power module short-circuit protection device is connected to the P end of the power module body, the second end of the power module short-circuit protection device is connected to the positive end of the power module power supply circuit and then connected to the bus P+ end, the first end of the phase current detection circuit is connected to the N+ end of the power module body U / N V / N W The three-phase terminals are connected, the second end of the phase current detection circuit is connected to the negative terminal of the power module power supply circuit and then connected to the bus N-terminal, the power module motor control circuit is connected to the U / V / W three-phase terminals, and the first end of the bootstrap circuit is simultaneously connected to the V B(U) Port, V B(V) Port, V B(W) Port, V S(U) Port, V S(V) Port and V S(W) The upper bridge arm drive circuit is connected to the IN port of the power module body at the same time. (UH) Port, IN (VH) Ports and IN (WH) The first end of the fault feedback circuit is connected to the V F0 The first end of the lower bridge arm driving circuit is connected to the IN of the power module body. (UL) Port, IN (VL) Ports and IN (WL) The first end of the overcurrent signal detection circuit is connected to the CSC port of the power module body, and the single-chip microcomputer circuit is simultaneously connected to the second end of the upper bridge arm drive circuit, the second end of the fault feedback circuit, the second end of the lower bridge arm drive circuit and the second end of the overcurrent signal detection circuit.

[0014] Preferably, the power supply includes a conversion circuit for converting input AC power into DC power, a power switch K, a high-voltage DC power supply DC1 and a power supply terminal VCC; the discharge circuit includes a high-voltage electrolytic capacitor CX, a relay RS with S1-S5 ports and a high-voltage light bulb PX; the voltage detection device includes a resistor R8, a resistor R2, a comparator PA and a clamping circuit; the logic protection device includes a light-emitting diode D4, a resistor R7, a negative gate, an NMOS tube Q2, a PMOS tube Q4, a buzzer SPK1 and a resistor R9; the first end of the power switch is connected to the first output end of the conversion circuit, and the second end of the power switch is simultaneously connected to the positive end of the high-voltage DC power supply DC1, the first end of the high-voltage electrolytic capacitor CX, the S3 port of the relay RS, the first end of the short-circuit protection circuit and the first end of the load output device, and then connected to the bus P+ end, and the negative end of the high-voltage DC power supply DC1 is simultaneously connected to the second output end of the conversion circuit, the second end of the high-voltage electrolytic capacitor CX, the first end of the high-voltage light bulb PX, the The first end of the resistor R7, the first end of the resistor R9, the first end of the power module body and the first end of the load output device are connected to the bus N-end, the S5 port of the relay RS is connected to the second end of the high-voltage light bulb PX, the S4 port of the relay RS is connected to the first end of the resistor R8, the second end of the resistor R8 is connected to the positive input end of the comparator PA, the negative input end of the comparator PA is connected to the first end of the resistor R2, the first output end of the comparator PA is simultaneously connected to the first end of the clamp circuit and the second end of the resistor R2, the second output end of the comparator PA is connected to the power supply end VCC, the third output end of the comparator PA is grounded, the second end of the clamp circuit is simultaneously connected to the input end of the yes-no gate, the positive end of the light-emitting diode and the gate of the PMOS tube Q4, the negative end of the light-emitting diode is connected to the second end of the resistor R7, the output end of the yes-no gate is connected to the gate of the NMOS tube Q2, and the collector of the NMOS tube Q2 is connected to the V F0 The emitter of the NMOS tube Q2 is grounded, the collector of the PMOS tube Q4 is connected to the power supply terminal VCC, the emitter of the PMOS tube Q4 is connected to the first end of the buzzer, the second end of the buzzer is connected to the second end of the resistor R9, and the second end of the short-circuit protection circuit is connected to the second end of the power module body.

[0015] Preferably, the conversion circuit is composed of a rectifier bridge BR, an inductor element, a diode element and a transistor element; the clamping circuit includes a second diode D2 and a third diode D3, the positive terminal of the second diode D2 is simultaneously connected to the first output terminal of the comparator PA and the negative terminal of the third diode D3, the positive terminal of the third diode D3 is grounded, and the negative terminal of the second diode D2 is connected to the power supply terminal VCC.

[0016] Preferably, the high-voltage light bulb PX is a high-voltage ordinary discharge light bulb, and the rated voltage of the high-voltage ordinary discharge light bulb is 350V, and the rated power of the high-voltage ordinary discharge light bulb is 200W; the high-voltage direct current power supply DC1 provides 12V voltage and / or 24V voltage.

[0017] Preferably, the short-circuit protection circuit is a detachable fuse circuit.

[0018] Compared with the related art, the present invention provides a residual power clearing and short-circuit protection device for power module function detection, which includes a power module under test, a test device connected to the power module under test for performing function detection on the power module under test, a power supply, a voltage detection device, a logic protection device and a load output device; the test device includes a test mainboard, a short-circuit protection circuit and a discharge circuit, the short-circuit protection circuit is connected to the test mainboard and the power module under test at the same time, and is used to protect the test mainboard from current shocks caused by short circuits in the power module under test; the discharge circuit is connected to the test mainboard and the power module under test at the same time, and is used to quickly consume the residual charge in the test mainboard and the power module under test to achieve residual power clearing. By setting a short-circuit protection circuit at the P+ end of the bus, when the functional module under test is a defective product such as a short circuit, it will cause excessive short-circuit energy to be generated between the P+ end of the bus and the N- end of the bus. At this time, the fuse of the short-circuit protection circuit will quickly blow to protect the test mainboard from being burned out, thereby reducing maintenance costs; by setting a high-efficiency discharge circuit at the P+ end of the bus and the N- end of the bus, and connecting a load output device, when the power is cut off, the residual electric energy of the test mainboard and the power module under test can be quickly absorbed, thereby achieving a discharge clearing effect and saving the discharge time of the test mainboard and the power module under test. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural block diagram of the residual power clearing and short-circuit protection device for power module function detection of the present invention;

[0020] Figure 2 A circuit diagram of a residual power clearing and short-circuit protection device for power module function detection of the present invention;

[0021] Figure 3 It is a structural schematic diagram of the power module under test of the present invention;

[0022] Figure 4 It is a partial three-dimensional structural schematic diagram of the testing device of the present invention. DETAILED DESCRIPTION

[0023] The present invention provides a residual power clearing and short-circuit protection device for power module function detection, aiming to solve the problems of low detection efficiency and high maintenance cost of existing detection devices.

[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] Please refer to the attached Figure 1-3 As shown, the present invention provides a residual power clearing and short circuit protection device for power module function detection, which includes:

[0026] Power module under test 1;

[0027] A test device 2, which is connected to the power module under test 1 and is used to perform a functional test on the power module under test 1; the test device 2 includes the test mainboard 21, a short-circuit protection circuit 22 and a discharge circuit 23, wherein the short-circuit protection circuit 22 is connected to the test mainboard 21 and the power module under test 1 at the same time, and is used to protect the test mainboard 21 from the current shock caused by the short circuit of the power module under test 1; the discharge circuit 23 is connected to the test mainboard 21 and the power module under test 1 at the same time, and is used to quickly consume the residual charge in the test mainboard 21 and the power module under test 1 to achieve residual charge clearing;

[0028] A power supply 3, which is connected to the test mainboard 21, the short-circuit protection circuit 22 and the discharge circuit 23, and is used to convert the input alternating current into direct current to supply power to the test mainboard 21, the short-circuit protection circuit 22 and the discharge circuit 23;

[0029] A voltage detection device 4, connected to the power module 1 under test, and used to detect the voltage value of the power module 1 under test;

[0030] A logic protection device 5, which is connected to the voltage detection device 4 and is used to control the on / off of the power supply 3 and the test mainboard 21, the short-circuit protection circuit 22 and the discharge circuit 23 according to the voltage value of the power module 1 under test;

[0031] A load output device 6 is connected to the power module 1 under test.

[0032] Specifically, the test main board 21 is specifically composed of an EMI circuit, a DC to DC circuit, a DC to AC circuit, a switching power supply circuit, a sampling circuit, a digital circuit, an analog circuit, etc. When the test main control board 21 receives the power signal of the power supply 3 and turns on the interconnection of each sub-circuit, the test main board 21 sends a control signal and outputs a drive signal to the power module 1 under test, thereby performing a functional detection process.

[0033] In this embodiment, the power module 1 under test includes a power module body 501 connected to the voltage detection device 4, the short-circuit protection circuit 22 and the discharge circuit 23, a power module short-circuit protection device 500, a bootstrap circuit 502, an upper bridge arm drive circuit 503, a single-chip circuit 504, a fault feedback circuit 505, a lower bridge arm drive circuit 506, an overcurrent signal detection circuit 507, a phase current detection circuit 508, a power module power supply circuit 509, a power module motor control circuit 510, a bus P+ terminal and a bus N- terminal; the power module body 501 has a V B(U) Port, V B(V) Port, V B(W) Port, V S(U) Port, V S(V) Port, V S(W) Port, IN (UH) Port, IN (VH) Port, IN (WH) Port, IN (UL) Port, IN (VL) Port, IN (WL) Port, V F0 port, CSC port, U / V / W three-phase terminal, N U / N V / N W The first end of the power module short-circuit protection device 500 is connected to the P end of the power module body 501, the second end of the power module short-circuit protection device 500 is connected to the positive end of the power module power supply circuit 509 and then connected to the bus P+ end, the first end of the phase current detection circuit 508 is connected to the N+ end of the power module body 501 U / N V / N W The three-phase terminals are connected, the second end of the phase current detection circuit 508 is connected to the negative terminal of the power module power supply circuit 509 and then connected to the bus N-terminal, the power module motor control circuit 510 is connected to the U / V / W three-phase terminals of the power module body 501, and the first end of the bootstrap circuit 502 is simultaneously connected to the V B(U) Port, V B(V) Port, V B(W) Port, V S(U) Port, VS(V) Port and V S(W) The upper bridge arm driving circuit 503 is connected to the IN port of the power module body 501 at the same time. (UH) Port, IN (VH) Ports and IN (WH) The first end of the fault feedback circuit 505 is connected to the V F0 The first end of the lower bridge arm driving circuit 506 is connected to the IN port of the power module body 501. (UL) Port, IN (VL) Ports and IN (WL) The first end of the overcurrent signal detection circuit 507 is connected to the CSC port of the power module body 501, and the single-chip computer circuit 504 is simultaneously connected to the second end of the upper bridge arm drive circuit 503, the second end of the fault feedback circuit 505, the second end of the lower bridge arm drive circuit 506 and the second end of the overcurrent signal detection circuit 507.

[0034] In the above structure, the power module short-circuit protection device 500 is a fuse short-circuit protection circuit. Through the setting of the power module short-circuit protection device 500, when a short-circuit fault occurs in the circuit of the power module 1 under test, the current will increase sharply instantly. The fuse in the fuse short-circuit protection circuit will be quickly blown in a short time, cutting off the path of the fault current, which can prevent excessive current from continuously flowing through the circuit and avoid causing serious damage to other components in the circuit, such as burning wires and damaging electronic components. Through the setting of the bootstrap circuit 502, a high-voltage driving power supply is provided for the high-side switch device of the power module 1 under test, and the capacitor is charged when the low-side switch is turned on, and the required high-voltage driving power supply is provided when the high-side switch needs to be turned on. Through the setting of the upper bridge arm driving circuit 503, its function is to allow low-frequency signals to pass through and suppress high-frequency signals. In the power module power supply circuit 509, in order to remove the high-frequency noise interference in the power module power supply circuit 509, a stable signal source is output. The single-chip microcomputer circuit 504 is used to communicate with the power module 1 under test, and exchanges data and communicates with the power module 1 under test through the serial port to realize the monitoring and control of various systems of the power module 1 under test; the fault feedback circuit 505 is mainly used to indicate the fault state or abnormal situation of the power module 1 under test. If the input voltage or output voltage of the power module 1 under test exceeds the allowable range, V f0 For example, in a power supply system, a sudden increase in input voltage may cause the power module 1 under test to not work properly. f0The port will feedback overvoltage fault information. The lower bridge arm driving circuit 506 is used to allow low-frequency signals to pass through and suppress high-frequency signals. In the power module power supply circuit 509, in order to remove the high-frequency noise interference in the power module power supply circuit 509, a stable signal source is output. The overcurrent signal detection circuit 507 mainly plays the role of overcurrent monitoring and triggering protection. The CSC port is output as a fault signal to the external control system, and can be processed accordingly according to the preset program, such as stopping the operation of the equipment, issuing an alarm prompt, performing fault diagnosis and recording, etc., so that the user can understand and handle the fault situation in time. The phase current detection circuit 508 can detect abnormal current conditions such as overcurrent and overload in time. When the current exceeds the set safety threshold, the voltage change on the sampling resistor will be recognized by the control system, triggering the corresponding protection mechanism, such as cutting off the circuit, issuing an alarm signal, etc., to prevent the measured power module and load from being damaged due to excessive current. The power module power supply circuit 509 needs to have sufficient power capacity to meet the working requirements of the measured power module. At the same time, in order to improve efficiency and reliability, the power module power supply circuit 509 should also have a high conversion efficiency to reduce energy loss and heat. The power module motor control circuit 510, in a three-phase motor control system, can accurately adjust the voltage and current output to the load by controlling the on and off of the power switching device (such as IGBT, etc.) inside the power module 1 under test, thereby achieving control of operating parameters such as load speed and torque.

[0035] Furthermore, the power supply 3 includes a conversion circuit 31 for converting input AC power into DC power, a power switch K, a high-voltage DC power supply DC1 and a power supply terminal VCC; the discharge circuit 23 includes a high-voltage electrolytic capacitor CX, a relay RS with S1-S5 ports and a high-voltage light bulb PX; the voltage detection device 4 includes a resistor R8, a resistor R2, a comparator 407 and a clamping circuit 41; the logic protection device 5 includes a light-emitting diode D4, a resistor R7, a non-gate 408, an NMOS tube Q2, a PMOS tube Q4, a buzzer SPK1 and a resistor R 9; the first end of the power switch K is connected to the first output end of the conversion circuit 31, the second end of the power switch K is simultaneously connected to the positive end of the high-voltage DC power supply DC1, the first end of the high-voltage electrolytic capacitor CX, the S3 port of the relay RS, the first end of the short-circuit protection circuit 22 and the first end of the load output device 6, and then connected to the bus P+ end, the negative end of the high-voltage DC power supply DC1 is simultaneously connected to the second output end of the conversion circuit 31, the second end of the high-voltage electrolytic capacitor CX, the first end of the high-voltage light bulb PX, the resistor The first end of R7, the first end of the resistor R9, the first end of the power module body 51 and the first end of the load output device 6 are connected to the busbar N-end, the S5 port of the relay RS is connected to the second end of the high-voltage light bulb PX, the S4 port of the relay RS is connected to the first end of the resistor R8, the second end of the resistor R8 is connected to the positive input end of the comparator 407, the negative input end of the comparator 407 is connected to the first end of the resistor R2, and the first output end of the comparator 407 is connected to the first end of the clamp circuit 41. The second end of the comparator 407 is connected to the power supply terminal VCC, the third output end of the comparator 407 is grounded, the second end of the clamp circuit 41 is simultaneously connected to the input end of the yes-no gate 408, the positive end of the light-emitting diode D4 and the gate of the PMOS tube Q4, the negative end of the light-emitting diode D4 is connected to the second end of the resistor R7, the output end of the yes-no gate 408 is connected to the gate of the NMOS tube Q2, the collector of the NMOS tube Q2 is connected to the V F0 The ports are connected, the emitter of the NMOS tube Q2 is grounded, the collector of the PMOS tube Q4 is connected to the power supply terminal VCC, the emitter of the PMOS tube Q4 is connected to the first end of the buzzer SPK1, the second end of the buzzer SPK1 is connected to the second end of the resistor R9, and the second end of the short-circuit protection circuit 22 is connected to the second end of the power module body 501.

[0036] In this embodiment, the conversion circuit 31 is composed of a rectifier bridge BR, an inductor element, a diode element and a transistor element; the clamping circuit 41 includes a second diode D2 and a third diode D3, the positive terminal of the second diode D2 is connected to the first output terminal of the comparator PA and the negative terminal of the third diode D3 at the same time, the positive terminal of the third diode D3 is grounded, and the negative terminal of the second diode D2 is connected to the power supply terminal VCC.

[0037] In this embodiment, the short-circuit protection circuit 22 is a detachable fuse circuit. By adding a detachable fuse circuit to the busbar P+ end of the power module 1 under test, the busbar is disconnected, and fuse bases are added at both ends of the notch. The fuse is placed on the base to form a path. When the test mainboard 21 works normally, the fuse does not affect the normal test work. When the power module under test is a defective product such as a short circuit, it will cause excessive short-circuit energy to be generated between the busbar P+ end and the busbar N- end of the power module under test 1. At this time, the fuse will quickly blow to protect the test mainboard 21. The load output device 6 is a brushless DC three-phase motor. Through the different switching frequencies of the power module 1 under test, the three-phase switching speed can be controlled to achieve high and low speed rotation.

[0038] In the above structure, the setting of the discharge circuit 23 is that when the power switch K is closed, the test mainboard 21 is powered on and works, the power supply 3 supplies power to the relay RS and starts working. Under the action of electromagnetic support, the internal contact point of the relay RS is switched from the S5 port to the S4 port, and the discharge circuit 23 is in an open circuit state. At this time, the discharge circuit 23 and the test mainboard 21 do not form a loop and have no discharge function; when the power switch K is opened, the test mainboard 21 is powered off and does not work, the relay RS disconnects the power supply 3, and the internal contact point of the relay RS is switched from S4 to S5, and the discharge circuit 23 is in a connected state, forming a loop with the test mainboard 21, and the electrical signal flows through the relay RS and the high-voltage light bulb PX. The high-voltage light bulb PX emits light and absorbs the residual electricity of the test mainboard 21, which can quickly consume the test mainboard 21 and the capacitor charge, thereby protecting the test mainboard 21.

[0039] The voltage detection device 4 is set up such that when the test mainboard 21 is powered on, the power supply 3 supplies power to the relay RS. When the power switch K is closed, the positive terminal voltage PA of the comparator 407 is higher than the negative terminal voltage Ref of the comparator 407. The first output terminal Vout of the comparator 407 is at a high level and is clamped by the clamping circuit 41. At this time, the first output terminal Vout of the comparator 407 = the power terminal VCC + 0.7V, and the light-emitting diode D4 emits light, which serves as a reminder to inform the operator that they are currently working and pay attention to safety. When the high level of the first output terminal Vout of the comparator 407 passes through the non-gate 408, it is converted into a low level. At this time, the NMOS tube Q2 is not turned on, and the fault port V of the power module 1 under test is turned off. FO The port is a high-level signal, and the power module 1 under test is in a normal working state. When the power switch K is opened, the positive terminal voltage PA of the comparator 407 is lower than the negative terminal voltage Ref of the comparator 407, and the first output terminal Vout of the comparator 407 is a low level, which is clamped by the clamping circuit 41. At this time, the first output terminal Vout of the comparator 407 is GND, and the light-emitting diode D4 is not working. When the low level output by the first output terminal Vout of the comparator 407 passes through the non-gate 408, it is converted into a high level. At this time, the NMOS tube Q2 is turned on, and the fault port VFO of the power module 1 under test is a low-level signal. The power module 1 under test is in a stop protection state. At this time, the PMOS tube Q4 is turned on, and the buzzer SPK1 alarms, warning the staff that the current state is in the discharge process, and pay attention to safety.

[0040] The protection logic mechanism circuit 5 is set up such that when the first output terminal Vout of the comparator 407 outputs a high level, the light-emitting diode D4 emits light, the PMOS tube Q4 is turned off, the buzzer SPK1 does not work, and after passing through the yes-no gate 408, the NMOS tube Q2 is also turned off, the VFO port of the power module 1 under test is at a high level, and the circuit works normally; when the first output terminal Vout of the comparator 407 outputs a low level, the light-emitting diode D4 does not work, the PMOS tube Q4 is turned on, the buzzer SPK1 works, and after passing through the yes-no gate 408, the NMOS tube Q2 is also turned on, the VFO port of the power module 1 under test is at a low level, the circuit stops working, and enters the discharge process.

[0041] In this embodiment, the high-voltage electric bulb PX is a high-voltage ordinary discharge bulb, and the rated voltage of the high-voltage ordinary discharge bulb is 350V, and the rated power of the high-voltage ordinary discharge bulb is 200W; the high-voltage DC power supply DC1 is used to provide 12V voltage and / or 24V voltage. Compared with the high-voltage gas discharge bulb, the high-voltage ordinary discharge bulb has low cost and high reliability; the contact point form of the relay RS is normally open, which has the advantages of fast action, stable operation, small size, and low leakage.

[0042] It is worth mentioning that please refer to the attached Figure 4 As shown, the present invention also provides a test device, which includes a test mainboard box 310 and a screw column 312, a gold finger test pin 314, a support frame 315 and the above-mentioned residual power clearing and short circuit protection device for power module function detection. The test mainboard box 310 is embedded with a test mainboard 21, the screw column 312 is used to fix the power module 1 under test to prevent poor contact of the power module 1 under test, and the gold finger test pin 314 is used to make the test mainboard 21 and the power module 1 under test form a test loop. The test equipment performs functional testing on the power module 1 under test in the following operation flow: 1. Fix the power module 1 under test on the test mainboard box 310 first; 2. Press the power switch K. After the test mainboard 21 is powered on, the power module 1 under test starts functional testing. When the test is completed, manually press the power switch K to cut off the power supply 3. At this time, the test box mainboard 310 and the discharge circuit 23 form a loop and start the discharge process. The residual electricity of the test mainboard 21 will pass through the discharge circuit 23 and flow through the high-voltage light bulb PX. The high-voltage light bulb PX lights up. The high-voltage light bulb PX lights up first and then goes out to determine whether the discharge is completed.

[0043] Compared with the related art, the present invention provides a residual power clearing and short-circuit protection device for power module function detection, which includes a power module under test, a test device connected to the power module under test for performing function detection on the power module under test, a power supply, a voltage detection device, a logic protection device and a load output device; the test device includes a test mainboard, a short-circuit protection circuit and a discharge circuit, the short-circuit protection circuit is connected to the test mainboard and the power module under test at the same time, and is used to protect the test mainboard from current shocks caused by short circuits in the power module under test; the discharge circuit is connected to the test mainboard and the power module under test at the same time, and is used to quickly consume the residual charge in the test mainboard and the power module under test to achieve residual power clearing. By setting a short-circuit protection circuit at the P+ end of the bus, when the functional module under test is a defective product such as a short circuit, it will cause excessive short-circuit energy to be generated between the P+ end of the bus and the N- end of the bus. At this time, the fuse of the short-circuit protection circuit will quickly blow to protect the test mainboard from being burned out, thereby reducing maintenance costs; by setting a high-efficiency discharge circuit at the P+ end of the bus and the N- end of the bus, and connecting a load output device, when the power is cut off, the residual electric energy of the test mainboard and the power module under test can be quickly absorbed, thereby achieving a discharge clearing effect and saving the discharge time of the test mainboard and the power module under test.

[0044] The above-described embodiments should be understood as illustrative rather than limiting the scope of protection of the present invention, which is subject to the claims. For those skilled in the art, some non-essential improvements and adjustments made to the present invention still fall within the scope of protection of the present invention without departing from the essence and scope of the present invention.

Claims

1. A residual power clearing and short circuit protection device for power module function detection, characterized in that: The residual power clearing and short circuit protection device comprises: The power module under test; A test device, which is connected to the power module under test and is used to perform a functional test on the power module under test; the test device comprises the test mainboard, a short-circuit protection circuit and a discharge circuit, the short-circuit protection circuit is connected to the test mainboard and the power module under test at the same time, and is used to protect the test mainboard from the current shock caused by the short circuit of the power module under test; the discharge circuit is connected to the test mainboard and the power module under test at the same time, and is used to quickly consume the residual charge in the test mainboard and the power module under test to achieve residual charge clearing; A power supply, which is connected to the test mainboard, the short-circuit protection circuit and the discharge circuit, and is used to convert the input alternating current into direct current to supply power to the test mainboard, the short-circuit protection circuit and the discharge circuit; A voltage detection device, connected to the power module under test, for detecting a voltage value of the power module under test; A logic protection device, connected to the voltage detection device, for controlling the on / off of the power supply and the test mainboard, the short-circuit protection circuit and the discharge circuit according to the voltage value of the power module under test; A load output device is connected to the power module under test.

2. A residual power clearing and short circuit protection device for power module function detection according to claim 1, characterized in that: The power module under test comprises a power module body connected to the voltage detection device, the short-circuit protection circuit, the discharge circuit and the load output device, a power module short-circuit protection device, a bootstrap circuit, an upper bridge arm drive circuit, a single-chip circuit, a fault feedback circuit, a lower bridge arm drive circuit, an overcurrent signal detection circuit, a phase current detection circuit, a power module power supply circuit, a power module motor control circuit, a bus P+ terminal and a bus N- terminal; the power module body has a V B(U) Port, V B(V) Port, V B(W) Port, V S(U) Port, V S(V) Port, V S(W) Port, IN (UH) Port, IN (VH) Port, IN (WH) Port, IN (UL) Port, IN (VL) Port, IN (WL) Port, V F0 port, CSC port, U / V / W three-phase terminal, N U / N V / N W The first end of the power module short-circuit protection device is connected to the P end of the power module body, the second end of the power module short-circuit protection device is connected to the positive end of the power module power supply circuit and then connected to the bus P+ end, the first end of the phase current detection circuit is connected to the N+ end of the power module body U / N V / N W The three-phase terminals are connected, the second end of the phase current detection circuit is connected to the negative terminal of the power module power supply circuit and then connected to the bus N-terminal, the power module motor control circuit is connected to the U / V / W three-phase terminals of the power module body, and the first end of the bootstrap circuit is simultaneously connected to the V B(U) port, the V B(V) port, the V B(W) port, the V S(U) port, the V S(V) port and the V S(W) The upper bridge arm driving circuit is connected to the IN port of the power module body at the same time. (UH) port, the IN (VH) port and the IN (WH) The first end of the fault feedback circuit is connected to the V F0 The first end of the lower bridge arm driving circuit is connected to the IN port of the power module body. (UL) port, the IN (VL) port and the IN (WL) The first end of the overcurrent signal detection circuit is connected to the CSC port of the power module body, and the single-chip microcomputer circuit is simultaneously connected to the second end of the upper bridge arm drive circuit, the second end of the fault feedback circuit, the second end of the lower bridge arm drive circuit and the second end of the overcurrent signal detection circuit.

3. A residual power clearing and short circuit protection device for power module function detection according to claim 2, characterized in that: The power supply includes a conversion circuit for converting input AC power into DC power, a power switch K, a high-voltage DC power supply DC1 and a power supply terminal VCC; the discharge circuit includes a high-voltage electrolytic capacitor CX, a relay RS with S1-S5 ports and a high-voltage light bulb PX; the voltage detection device includes a resistor R8, a resistor R2, a comparator PA and a clamping circuit; the logic protection device includes a light-emitting diode D4, a resistor R7, a negative gate, an NMOS tube Q2, a PMOS tube Q4, a buzzer SPK1 and a resistor R9; the first end of the power switch K is connected to the first output end of the conversion circuit, the second end of the power switch K is simultaneously connected to the positive end of the high-voltage DC power supply DC1, the first end of the high-voltage electrolytic capacitor CX, the S3 port of the relay RS, the first end of the short-circuit protection circuit and the first end of the load output device, and then connected to the bus P+ end, the negative end of the high-voltage DC power supply DC1 is simultaneously connected to the second output end of the conversion circuit, the second end of the high-voltage electrolytic capacitor CX, the first end of the high-voltage light bulb PX, the resistor The first end of R7, the first end of the resistor R9, the first end of the power module body and the first end of the load output device are connected to the bus N-end, the S5 port of the relay RS is connected to the second end of the high-voltage light bulb PX, the S4 port of the relay RS is connected to the first end of the resistor R8, the second end of the resistor R8 is connected to the positive input end of the comparator PA, the negative input end of the comparator PA is connected to the first end of the resistor R2, the first output end of the comparator PA is simultaneously connected to the first end of the clamp circuit and the second end of the resistor R2, the second output end of the comparator PA is connected to the power supply end VCC, the third output end of the comparator PA is grounded, the second end of the clamp circuit is simultaneously connected to the input end of the yes-no gate, the positive end of the light-emitting diode and the gate of the PMOS tube Q4, the negative end of the light-emitting diode is connected to the second end of the resistor R7, the output end of the yes-no gate is connected to the gate of the NMOS tube Q2, and the collector of the NMOS tube Q2 is connected to the V F0 The emitter of the NMOS tube Q2 is grounded, the collector of the PMOS tube Q4 is connected to the power supply terminal VCC, the emitter of the PMOS tube Q4 is connected to the first end of the buzzer, the second end of the buzzer is connected to the second end of the resistor R9, and the second end of the short-circuit protection circuit is connected to the second end of the power module body.

4. A residual power clearing and short circuit protection device for power module function detection according to claim 3, characterized in that: The conversion circuit is composed of a rectifier bridge BR, an inductor element, a diode element and a transistor element; the clamping circuit includes a second diode D2 and a third diode D3, the positive terminal of the second diode D2 is connected to the first output terminal of the comparator PA and the negative terminal of the third diode D3 at the same time, the positive terminal of the third diode D3 is grounded, and the negative terminal of the second diode D2 is connected to the power supply terminal VCC.

5. The residual power clearing and short circuit protection device for power module function detection according to claim 3, characterized in that: The high-voltage light bulb PX is a high-voltage ordinary discharge light bulb, and the rated voltage of the high-voltage ordinary discharge light bulb is 350V, and the rated power of the high-voltage ordinary discharge light bulb is 200W; the high-voltage direct current power supply DC1 is used to provide 12V voltage and / or 24V voltage.

6. The residual power clearing and short circuit protection device for power module function detection according to claim 3, characterized in that: The short-circuit protection circuit is a detachable fuse circuit.

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