A kind of insulated gate bipolar transistor inspection equipment specially used for container terminals
Through the boost and automatic shutdown module of the special insulated gate bipolar transistor inspection equipment for container terminals, combined with the trigger operation and display module, the problem of the failure of the existing technology to detect circuit breakers and degraded insulation performance is solved, and the insulated gate bipolar transistor is realized Accurate fault judgment and performance evaluation.
Patent Information
- Application Number
- CN202110414972.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-04-17
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2041-04-17
AI Technical Summary
Existing detection methods cannot accurately determine the circuit breaking and insulation performance of insulated gate bipolar transistors, and can only detect short-circuit faults.
A special insulated gate bipolar transistor inspection equipment for container terminals was designed, using a boost module, a DC voltage supply module and an automatic shutdown module. By gradually increasing the DC voltage until the insulated gate bipolar transistor to be broken down, the breakdown voltage is demonstrated. , and combine the trigger operation module, the trigger current display module and the trigger voltage display module to achieve accurate detection of insulated gate bipolar transistors.
It can accurately judge the insulation degree and fault type of insulated gate bipolar transistors, avoid misjudgment, provide more detailed performance evaluation, and ensure the accuracy and reliability of detection.
Smart Images
Figure CN113176486B_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of detection circuits, and in particular to an insulated gate bipolar transistor inspection device dedicated to container terminals. Background Art
[0002] Gantry cranes, Zhenhua bridge cranes and rail cranes are common lifting equipment at docks. These automated equipment contain a large number of insulated gate bipolar transistors of various brands and specifications.
[0003] As the equipment ages and frequency of use increase, the bipolar transistors in the gantry crane are prone to aging. Failures of insulated gate bipolar transistors often occur in the form of short circuits, open circuits, or hidden failures of the device due to reduced insulation performance. The existing detection method uses an ohmmeter to measure the resistance between the source and drain of the insulated gate bipolar transistor when the equipment is powered off to determine whether it is damaged.
[0004] Regarding the above-mentioned related technologies, since the process of turning off the insulated gate bipolar transistor is equivalent to a short circuit, the existing method of using an ammeter to detect can only detect whether there is a short circuit between the source and the drain of the insulated gate bipolar transistor, and cannot judge the situation of short circuit and reduced insulation performance. Summary of the invention
[0005] In order to more accurately inspect faults of insulated gate bipolar transistors inside a driver, the present application provides an insulated gate bipolar transistor inspection device dedicated to a container terminal.
[0006] The present application provides a container terminal dedicated insulated gate bipolar transistor inspection device that adopts the following technical solution.
[0007] A container terminal dedicated insulated gate bipolar transistor inspection equipment, comprising:
[0008] A power conversion module, whose input terminal is used to connect to the mains to output a DC drive power supply;
[0009] A DC voltage supply module is coupled to the power conversion module, and has a rated voltage detection terminal between the positive phase output terminal and the negative phase output terminal for coupling to the insulated gate bipolar transistor to be tested;
[0010] A boost module, coupled to the DC voltage supply module, for gradually increasing the output voltage of the DC voltage supply module;
[0011] An automatic shut-off module, coupled to the DC voltage supply module and the boost module, to shut down and reset the boost module after the insulated gate bipolar transistor to be tested breaks down so that the DC voltage supply module stops outputting voltage;
[0012] and a voltage detection and display module, coupled to the DC voltage supply module, to display the breakdown voltage of the insulated gate bipolar transistor to be tested to personnel.
[0013] By adopting the above technical solution, the voltage of the DC voltage supply module is continuously increased through the boost module until it reaches the rated voltage of the insulated gate bipolar transistor to be tested to break down the insulated gate bipolar transistor to be tested. By detecting the breakdown voltage, personnel can obtain the rated voltage value of the insulated gate bipolar transistor to be tested and know the insulation degree of the insulated gate bipolar transistor to be tested. By comparing the value of the rated voltage with the factory parameters, it can be determined whether there is an open circuit or short circuit fault, and the insulated gate bipolar transistor can be accurately detected.
[0014] Preferably, it also includes:
[0015] A trigger operation module is coupled to the power conversion module, and an output end of the trigger operation detection port is connected to the insulated gate bipolar transistor to be tested, so as to trigger the insulated gate bipolar transistor to be tested to be turned on;
[0016] And a trigger current display module is coupled to the trigger operation module and is used to display the gate current of the insulated gate bipolar transistor to be tested when it is triggered to be turned on to personnel.
[0017] By adopting the above technical solution, the trigger current display module and the trigger operation module are set to detect the trigger current of the insulated gate bipolar transistor to be tested, so as to determine the performance of the insulated gate bipolar transistor to be tested after being triggered.
[0018] Preferably, it also includes:
[0019] The trigger voltage display module is coupled to the trigger operation module, detects the gate-source voltage of the insulated gate bipolar transistor to be tested and displays it to personnel.
[0020] By adopting the above technical solution and detecting the gate-source voltage of the insulated gate bipolar transistor to be tested, the resistance value of the insulated gate bipolar transistor to be tested after being triggered to be turned on can be understood through calculation, and the performance of the insulated gate bipolar transistor to be tested can be understood.
[0021] Preferably, the trigger operation module is coupled to a sound reminder module, and the sound reminder module is used to start after the insulated gate bipolar transistor to be tested is triggered and turned on.
[0022] By adopting the above technical solution and setting the sound reminder module, personnel can be reminded after the insulated gate bipolar transistor to be tested is triggered and turned on.
[0023] Preferably, the power conversion module includes:
[0024] A DC main power supply module, coupled to the boost module, for supplying voltage to the boost module;
[0025] and a DC auxiliary power supply module, coupled to the trigger operation module and connected in parallel with the DC main power supply module, for supplying voltage to the trigger operation module.
[0026] By adopting the above technical solution, the mainstream main power supply module and the DC auxiliary power supply module respectively supply voltage to the boost module and the trigger operation module, so that the power supplies are independent of each other, preventing the trigger current display module, the trigger voltage display module, and the voltage detection display module from interfering with each other due to reasons such as the common ground of the power supplies, and avoiding large errors in the data displayed by the digital display or unstable data display.
[0027] Preferably, the DC main power supply module is coupled to a voltage stabilizing module, and the voltage stabilizing module is used to keep the output voltage of the DC main power supply module stable.
[0028] By adopting the above technical solution, the setting of the voltage stabilizing module makes the voltage output by the DC main power supply module more stable.
[0029] Preferably, the output end of the DC main power supply module is coupled to a controllable precision voltage regulator TL431 to keep its own output voltage stable.
[0030] By adopting the above technical solution, when the output voltage increases, the output voltage increases, resulting in an increase in the voltage sampled by the TL431 output. At this time, the internal circuit will adjust to reduce the output voltage to achieve voltage regulation. The voltage regulation is applicable to 2.5V~36V, which is compatible with the circuit voltage in this device.
[0031] Preferably, the boost module is coupled to a start indication module, and the start indication module is used to give a light indication to personnel after the boost module is started.
[0032] By adopting the above technical solution and starting the setting of the indication module, a light indication can be issued to remind personnel, so that personnel can understand that the boost module has been started.
[0033] Preferably, the voltage detection display module includes:
[0034] A voltage collection unit, coupled to the DC voltage supply module, for collecting the voltage across the DC voltage supply module and outputting a rated voltage signal;
[0035] And a rated voltage displayer is coupled to the voltage acquisition unit, has an electronic display screen, receives the rated voltage signal, and responds by displaying the rated voltage value on the electronic display screen.
[0036] By adopting the above technical solution, when the insulated gate bipolar transistor to be tested is broken down by the rated voltage, the voltage of the DC voltage supply module is collected by the voltage collection unit to obtain the rated voltage signal, and then the rated voltage displayer converts the rated voltage signal into digital information and displays it on the electronic display screen for people to watch.
[0037] In summary, the present application includes at least one of the following beneficial technical effects:
[0038] By setting up a boost module, a DC voltage supply module and an automatic shut-off module, the device can more accurately check the faults in the insulated gate bipolar transistor inside the driver;
[0039] By setting up a trigger operation module, a trigger current display module and a trigger voltage display module, personnel can detect the voltage and current of the insulated gate bipolar transistor after triggering when the power is off, and further judge the performance of the insulated gate bipolar transistor.
[0040] By providing a DC auxiliary power supply module and a DC main power supply module, the trigger detection of the insulated gate bipolar transistor and the detection of the rated voltage are not easily interfered with each other. BRIEF DESCRIPTION OF THE DRAWINGS
[0041] Figure 1 is a circuit diagram of a power conversion module according to an embodiment of the present application.
[0042] Figure 2 It is a circuit diagram of a boost module and a DC voltage supply module according to an embodiment of the present application.
[0043] Figure 3 It is a circuit diagram of the trigger operation module of an embodiment of the present application.
[0044] Explanation of the accompanying drawings: 1. Power conversion module; 11. DC main power supply module; 12. DC auxiliary power supply module; 121. Power supply circuit; 13. Transformer module one; 14. Transformer module two; 15. Voltage stabilizing module; 2. Boost module; 21. Start indication module; 3. DC voltage supply module; 4. Automatic shutdown module; 5. Start module; 6. Voltage detection and display module; 61. Voltage acquisition unit; 62. Rated voltage display; 7. Trigger operation module; 8. Trigger current display module; 9. Trigger voltage display module; 10. Sound reminder module. DETAILED DESCRIPTION
[0045] The following is combined with Figure 1-3 This application is described in further detail.
[0046] The embodiment of the present application discloses an insulated gate bipolar transistor inspection device dedicated to a container terminal.
[0047] Reference Figure 1 , an insulated gate bipolar transistor inspection device dedicated to a container terminal, comprising a power conversion module 1, a boost module 2, a DC voltage supply module 3, an automatic shutdown module 4, a start module 5, a voltage detection display module 6, a trigger operation module 7, a trigger current display module 8 and a trigger voltage display module 9.
[0048] The power conversion module 1 includes a DC main power module 11 and a DC auxiliary power module 12, and its input end is used to connect to the mains to output a DC driving power supply;
[0049] The DC main power supply module 11 includes a full-bridge rectifier and a transformer CT. The transformer CT is a three-winding coil transformer. The first pin of the full-bridge rectifier is coupled to an inductor L1, the other end of the inductor L1 is coupled to a resistor R0, the other end of the resistor R0 is connected to a live wire, a switch S1 is connected in series between the resistor R0 and the live wire, the third pin of the full-bridge rectifier is coupled to an inductor L2, the other end of the inductor L2 is connected to a neutral wire, the connection point between the inductor L1 and the resistor R0 is coupled to a capacitor C1, and the other end of the capacitor C1 is coupled to the neutral wire.
[0050] The second pin of the full-bridge rectifier is coupled with a thermistor RT, the other end of the thermistor RT is connected to the primary winding coil of the transformer CT, the connection point between the thermistor RT and the primary winding coil of the transformer CT is coupled with a polar capacitor C2, the negative electrode of the polar capacitor C2 is coupled to the fourth pin of the full-bridge rectifier, the other connection point between the thermistor RT and the primary winding coil of the transformer CT is coupled with a diode D1, the anode of the diode D1 is coupled to the thermistor RT, the diode D1 is coupled to a diode D2, the cathode of the diode D2 is coupled to the cathode of the diode D1, the anode of the diode D2 is coupled to the other end of the primary winding coil of the transformer CT, and the anode of the diode D2 is also coupled to a voltage stabilizing module 15.
[0051] The voltage stabilizing module 15 includes a TOP223Y integrated circuit, a capacitor C3, a diode D3, and a photocoupler IC1. The anode of the diode D2 is coupled to the drain of the TOP223Y integrated circuit, and the drain of the TOP223Y integrated circuit is also coupled to the capacitor C3. The other end of the capacitor C3 is coupled to the third pin of the photocoupler IC1. The fourth pin of the photocoupler IC1 is coupled to a resistor R1. The middle electrical connection point between the resistor R1 and the photocoupler IC1 is coupled to the control end of the TOP223Y integrated circuit. The other end of the resistor R1 is coupled to a polarity capacitor C4. The cathode of the polarity capacitor C4 is coupled to the cathode of the polarity capacitor C2. The second pin of the photocoupler IC1 is grounded. The first pin of the photocoupler IC1 is coupled to a resistor R2. The other end of the resistor R2 is coupled to a Schottky barrier rectifier diode D4. The anode of the Schottky barrier rectifier diode D4 is coupled to the secondary winding coil of the transformer CT, and the cathode is coupled to the secondary winding coil of the transformer CT. The cathode of the Schottky barrier rectifier diode D4 is also coupled with an inductor L3. The other end of the inductor L3 is an output end, which outputs a 12V DC power supply. The output end of the inductor L3 is coupled with a resistor R3. The other end of the resistor R3 is coupled with a controllable precision voltage regulator TL431. The control end of the controllable precision voltage regulator TL431 is coupled with the resistor R3, the anode is coupled with a polar capacitor C4, and the cathode is grounded. The anode of the polar capacitor C4 is coupled to the connection point between the inductor L3 and the Schottky barrier rectifier diode D4, the electrical connection point between the cathode of the polar capacitor C4 and the anode of the controllable precision voltage regulator TL431 is coupled to the other end of the secondary winding coil of the transformer CT, the polar capacitor C4 is connected in parallel with a capacitor C5, the connection point between the control end of the controllable precision voltage regulator TL431 and the resistor R3 is coupled with a resistor R4 and a capacitor C6, the other end of the resistor R4 is coupled with the capacitor C5, and the other end of the capacitor C6 is grounded.
[0052] The output end of the inductor L3 is also coupled to a resistor R5 , the other end of the resistor R5 is grounded, and the resistor R5 is connected in parallel with polar capacitors C7 , C8 , C9 and C10 . The output end of the inductor L3 is the positive output end of the DC main power module 11 .
[0053] The voltage stabilizing module 15 uses the TOP223Y integrated circuit three-terminal offline pulse width modulation switch device as the core component. The TOP223Y integrated circuit has multiple protection functions such as overload current limiting and undervoltage lockout, and is more suitable. After the secondary power supply is started, oscillated, and excited, it is output from the secondary of the switching transformer, and a stable +12V DC voltage is output through diode rectification and capacitor filtering as the power supply for the automatic voltage adjustment circuit.
[0054] After the DC main power supply module 11 works, as the load size changes, the system DC power supply output voltage also changes at the same time. When the load becomes lighter, the output voltage and current of the DC main power supply module 11 become larger, and are fed back to the tertiary winding coil of the transformer CT. After rectification, filtering, and current limiting, they are sent to the control end of the TOP223Y integrated circuit, so that the current of the control end increases. Under the control of the oscillation circuit, the TOP223Y integrated circuit performs closed-loop adjustment inside, and controls the output duty cycle of the MOSFET through PWM, so that its duty cycle is linearly reduced, thereby reducing the output voltage, and finally achieving dynamic balance, maintaining a stable output of +12V DC voltage. Conversely, when the load becomes larger, the same applies. In addition, at the output end of the secondary coil of the transformer CT, the high-frequency square wave voltage of the secondary of the high-frequency transformer is rectified through the Schottky barrier rectifier diode D4, and then filtered by an electrolytic capacitor and controlled by the controllable precision voltage regulator TL431 feedback control voltage regulation, so that the output voltage can be more stable.
[0055] The positive output end of the DC main power supply module 11 is coupled to the transformer module 13, and the transformer module 13 includes an IC2 chip. The IC2 chip adopts L7805CV. The positive output end of the DC main power supply module 11 is coupled to the input end of the IC2 chip. The ground end of the IC2 chip is grounded. The output end of the IC2 chip outputs a 5V DC voltage. The input end of the IC2 chip is coupled to a capacitor C11, and the other end of the capacitor C11 is grounded. The output end of the IC2 chip is coupled to a capacitor C12, and the other end of the capacitor C12 is grounded. The output end of the IC2 chip is also coupled to a polarity capacitor C13, and the positive pole of the polarity capacitor C13 is coupled to the output end of the IC2 chip, and the negative pole of the polarity capacitor C13 is grounded.
[0056] The positive output end of the DC main power supply module 11 is coupled with the transformer module 2 14, and the transformer module 2 14 includes an IC3 chip. The IC3 chip adopts L7809CV. The positive output end of the DC main power supply module 11 is coupled with the input end of the IC3 chip. The ground end of the IC3 chip is grounded. The output end of the IC3 chip outputs a 9V DC voltage. The input end of the IC3 chip is coupled with a capacitor C14, and the other end of the capacitor C14 is grounded. The output end of the IC3 chip is coupled with a capacitor C15, and the other end of the capacitor C15 is grounded. The output end of the IC3 chip is also coupled with a polarity capacitor C16, and the positive pole of the polarity capacitor C16 is coupled with the output end of the IC3 chip, and the negative pole of the polarity capacitor C16 is grounded.
[0057] The DC auxiliary power supply module 12 includes two parallel 5V power supply circuits 121. The two power supply circuits 121 have the same structure. The power supply circuit 121 includes a transformer T1, a diode D5 and an IC4 chip. The IC4 chip adopts an L7805CV chip. One end of the primary coil of the transformer T1 is coupled to the connection point between the inductor L1 and the full-bridge positive rectifier, and the other end is coupled to the connection point between the inductor L2 and the full-bridge positive rectifier. One end of the secondary coil of the transformer T1 is coupled to the anode of the diode D5, and the other end is grounded. The diode D5 The cathode is coupled to the input end of the IC4 chip, the ground end of the IC4 chip is grounded, the input end of the IC4 chip is coupled with capacitor C18, the other end of capacitor C18 is grounded, the input end of the IC4 chip is also coupled with polarity capacitor C17, the positive electrode of polarity capacitor C17 is coupled to the output end of the IC4 chip, the negative electrode of polarity capacitor C17 is grounded, the output end of the IC4 chip is also coupled with polarity capacitor C19, the positive electrode of polarity capacitor C19 is coupled to the output end of the IC4 chip, the negative electrode of polarity capacitor C19 is grounded, and the output end of the IC4 chip is used to output 5V DC.
[0058] Reference Figure 2 The boost module 2 includes an IC6 chip and a MOSFET tube Q1. The IC6 chip adopts an UC3845 integrated chip. The output end of the DC main power supply module 11 is coupled to the seventh pin of the IC6 chip. The fifth pin of the IC6 chip is grounded, and its eighth pin is connected to a capacitor C28. The other end of the capacitor C28 is grounded. The fourth pin of the IC6 chip is coupled to a capacitor C27. The other end of the capacitor C27 is grounded. The connection point between the capacitor C28 and the eighth pin of the IC6 chip is coupled to a resistor R22. The other end of the resistor R22 is coupled to the connection point between the capacitor C27 and the fourth pin of the IC6 chip.
[0059] The sixth pin of IC6 chip is coupled with resistor R25, the other end of resistor R25 is coupled with the gate of MOSFET tube Q1, the connection point between resistor R2 and the gate of MOSFET tube Q1 is coupled with resistor R26, the other end of resistor R26 is grounded, and the drain of MOSFET tube Q1 is coupled with DC voltage supply module 3. The source of MOSFET tube Q1 is coupled with resistor R27 and diode D10 with very small resistance, the other end of resistor R27 is grounded, the anode of diode D10 is grounded, and the cathode is coupled with the source of MOSFET tube Q1, the connection point between resistor R27 and the source of MOSFET tube Q1 is coupled with resistor R23, the other end of resistor R23 is coupled with the third pin of IC6 chip, and capacitor C26 is connected in series between the third pin of IC6 chip and the ground line. The third pin of IC6 chip is coupled with diode D9, the cathode of diode D9 is connected with the third pin of IC6 chip, and the anode is coupled with resistor R24, and the other end of resistor R24 is coupled with the seventh pin of IC6 chip.
[0060] The DC voltage supply module 3 includes a diode D6 and a transformer T3. One end of the primary coil of the transformer T3 is coupled to the connection point between the resistor R24 and the seventh pin of the IC6 chip, and the other end is coupled to the drain of the MOSFET tube Q1. One end of the secondary coil of the transformer T3 is coupled to the anode of the diode D6, and the other end is grounded. The cathode of the diode D6 is coupled to a resistor R15. The other end of the resistor R15 is a rated voltage detection end. The rated voltage detection end is used to couple the drain of the insulated gate bipolar transistor to be tested. The gate and source of the insulated gate bipolar transistor to be tested are short-circuited. The connection point between the two is coupled with a series resistor R21. The other end of the resistor R21 is grounded. The resistor R21 is also connected in parallel with a capacitor C25.
[0061] The cathode of diode D6 is also coupled to resistor R16, which is connected in parallel with capacitor C20. The other end of capacitor C20 is coupled to capacitor C21, and the other end of capacitor C21 is grounded. The other end of resistor R16 is coupled to the first pin of IC6 chip. The other end of resistor R16 is also coupled to resistor R18, and the other end of resistor R18 is coupled to the second pin of IC6 chip. Resistor R18 is connected in parallel with resistor R17 and capacitor C23. The second pin of IC6 chip is coupled to capacitor C22, and the other end of capacitor C22 is grounded. Resistor R16 and resistor R17 are both large resistors with a resistance of 10M.
[0062] The automatic shut-off module 4 includes a diode D8 and a voltage-stabilizing diode D7. The anode of the diode D8 is coupled to the gate of the insulated gate bipolar transistor to be tested, the cathode of the diode D8 is coupled to the cathode of the voltage-stabilizing diode D7, and the anode of the voltage-stabilizing diode D7 is grounded. The connection point between the diode D8 and the voltage-stabilizing diode D7 is coupled to the second pin of the IC6 chip. The connection point between the diode D8 and the voltage-stabilizing diode D7 is also coupled to an adjustable resistor R19. The other end of the adjustable resistor R19 is connected in series with a resistor R20 and then grounded.
[0063] UC3845 is a high-performance fixed-frequency current mode controller designed for offline and DC-to-DC converter applications. It has an internal oscillator that can perform precise duty cycle control. After the boost module 2 is powered on, it automatically adjusts the voltage. The circuit directly drives the gate of the MOSFET tube Q1 through the IC6 chip output pin (the sixth pin). The peak current of up to 1.OA is pulled and poured through this pin, and the output switching frequency is half the oscillator frequency. After the excitation oscillation is amplified, the voltage on the primary coil and the secondary coil of the transformer rises continuously, and a maximum DC voltage of about 1500V can be generated to break down the insulated gate bipolar transistor to be tested.
[0064] Due to the setting of the automatic shut-off module 4, after the voltage between the source and the drain of the insulated gate bipolar transistor to be tested rises to the rated voltage and breaks down the insulated gate bipolar transistor to be tested, the voltage between the voltage stabilizing diode D7 and the diode D6 rises to a state higher than 2.5V, the IC6 chip stops outputting voltage, the DC voltage supply module 3 stops running after losing the voltage supply output by the boost module 2, and the insulated gate bipolar transistor to be tested is no longer turned on, so the boost module 2 restarts, and the cycle is repeated. Since each cycle is executed, it stops when it reaches the breakdown voltage (rated voltage) of the source of the insulated gate bipolar transistor to be tested, and such a dynamic balance shows that a fixed voltage is output. Incidentally, there are many types of insulated gate bipolar transistors, and their rated voltages are different. By continuously increasing the voltage at the end of the insulated gate bipolar transistor to reach the actual breakdown voltage of the insulated gate bipolar transistor to be tested, and by detecting the specific value of the breakdown voltage, the actual rated voltage of each insulated gate bipolar transistor to be tested can be obtained.
[0065] The voltage detection and display module 6 includes a voltage acquisition unit 61 and a rated voltage display 62 .
[0066] The specific voltage acquisition unit 61 includes a resistor R11, a resistor R12, an adjustable resistor R13 and a resistor R14, wherein the resistor R12 is coupled to the drain connection of the insulated gate bipolar transistor to be measured, the other end of the resistor R12 is coupled to the resistor R11, the other end of the resistor R11 is coupled to the adjustable resistor R13, the other end of the adjustable resistor R13 is coupled to the resistor R14, the resistor R14 is grounded, the adjustment end of the adjustable resistor R13 is coupled to a capacitor C24, the other end of the capacitor C24 is grounded, wherein the resistor R12 and the resistor R11 are both large resistors with a resistance of 10M;
[0067] The rated voltage display 62 adopts an intelligent processor, which has a CPU. The rated voltage display 62 has a display screen. The rated voltage display 62 is powered by the transformer module 13. The signal input end of the rated voltage display 62 is coupled to the adjustment end of the adjustable resistor R13 to receive the detected rated voltage signal, and then obtains the rated voltage of the insulated gate bipolar transistor to be tested through analog-to-digital conversion and calculation, and displays it on the display screen.
[0068] The startup module 5 is coupled to the boost module 2 and is used to control the opening and closing of the boost module 2. Specifically, the startup module 5 includes a photocoupler IC5, a double-throw switch S2, and a transistor Q1. The double-throw switch S2 has an input end, a first output end, and a second output end. The input end of the double-throw switch S2 is coupled to the output end of the DC main power supply module 11, and the first output end thereof is coupled to a resistor R6. The other end of the resistor R6 is coupled to the first pin of the photocoupler IC5, and the second pin of the photocoupler IC5 is grounded. The photocoupler IC5 The third pin of is coupled to the connection point between the resistor R24 and the diode D9, the fourth pin of the photocoupler IC5 is grounded, the second output end of the double-throw switch S2 is coupled to the resistor R7, the other end of the resistor R7 is coupled to the resistor R9, the other end of the resistor R9 is grounded, the connection point between the resistor R7 and the resistor R9 is coupled to the base of the transistor Q1, the collector of the transistor Q1 is coupled to the resistor R10, the other end of the resistor R10 is coupled to the drain of the insulated gate bipolar transistor to be tested, and the emitter of the transistor Q1 is grounded.
[0069] When the double-throw switch S2 is biased to the first output end, the photocoupler IC5 is turned on, the third pin of the IC6 chip is grounded, and the voltage of the third pin of the IC6 chip is set to zero, so that the IC6 chip can work normally. When the double-throw switch S2 is biased to the second output end, the photocoupler IC5 is in a high-resistance state, so that the voltage of the third pin of the IC6 chip is greater than 1V, the output of the IC6 chip is turned off, the MOSFET tube Q1 is turned off, so that the DC voltage supply module 3 is turned off, and the transistor Q2 is turned on, the voltage acquisition unit 61 is short-circuited, so that there is no current in the resistor R13, and there is no number on the display screen of the rated voltage display 62. Personnel can start or shut down the boost module 2 by pressing the double-throw switch S2.
[0070] The indication start module 5 includes a resistor R8 and an LED 1. One end of the resistor R8 is coupled to the connection point between the first output end of the double-throw switch S2 and the resistor R6. The other end of the resistor R8 is coupled to the anode of the LED 1. The cathode of the LED 1 is grounded. When the LED 1 lights up, it means that the double-throw switch S2 is biased to the first output end. At this time, the DC voltage supply module 3 is in a normal working state.
[0071] Reference Figure 3, triggering operation module 7, including resistor R28, capacitor C29 and resistor R29, the output end of transformer module 2 14 is coupled with switch S3, the other end of switch S3 is coupled with the drain of the insulated gate bipolar transistor to be tested, the source of the insulated gate bipolar transistor to be tested is grounded, resistor R28 is also coupled with the output end of transformer module 2 14, the other end of resistor R28 is coupled with switch S4, switch S3 and switch S4 are linked mechanical switches, the other end of switch S4 is coupled with the gate of the insulated gate bipolar transistor to be tested, resistor R29 is coupled to the connection point between the gate of the insulated gate bipolar transistor to be tested and resistor R28, the other end of resistor R29 is grounded, capacitor C29 is connected in parallel with resistor R29. The connection point between switch S4 and the gate of the insulated gate bipolar transistor to be tested is coupled with resistor R30, the other end of resistor R30 is coupled with LED2, and the cathode of LED2 is grounded. When switch S4 is closed, LED2 will light up, indicating that the insulated gate bipolar transistor to be tested has started to be tested.
[0072] The trigger operation module 7 is coupled to a sound reminder module 10, which includes an electric bell, one end of which is coupled to the source of the insulated gate bipolar transistor to be tested and the other end is grounded. When the insulated gate bipolar transistor to be tested is turned on, the electric bell will emit a sound reminder to indicate to the person that the insulated gate bipolar transistor to be tested is turned on.
[0073] The trigger current display module 8 adopts a current digital display meter, which is powered by the power supply circuit 121 and is connected in series between the switch S3 and the insulated gate bipolar transistor to be tested to detect the current passing through the insulated gate bipolar transistor to be tested. The trigger voltage display module 9 has a digital display screen to digitally display the trigger current for people to watch.
[0074] The trigger voltage display module 9 adopts a voltage digital display meter and is powered by a power supply circuit 121. Its first input terminal is coupled to the drain of the insulated gate bipolar transistor to be tested, and its second input terminal is coupled to the source of the insulated gate bipolar transistor to be tested, so as to detect the voltage between the source and the drain of the insulated gate bipolar transistor to be tested. The trigger voltage display module 9 has a digital display screen to display the trigger voltage for people to watch.
[0075] Personnel can evaluate the performance of the insulated gate bipolar transistor based on the detected current and voltage after the insulated gate bipolar transistor is turned on. Generally speaking, the smaller the tube voltage drop and current value of the insulated gate bipolar transistor, the better the performance.
[0076] The implementation principle of the insulated gate bipolar transistor inspection device for container terminals in the embodiment of the present application is as follows: the circuit composed of UC3845 is used to generate an automatic adjustment voltage. The circuit directly drives the gate of the MOSFET tube Q1 through the output pin of UC3845. The peak current of up to 1.0A is pulled and poured through this pin, and the output switching frequency is half of the oscillator frequency. The excitation oscillation is generated after amplification, and the maximum can automatically rise to about 1500V DC voltage. The positive electrode of the voltage is connected to the drain of the insulated gate bipolar transistor, and the negative electrode is connected to the source of the insulated gate bipolar transistor. The double-throw switch S2 is pressed to make UC3845 work, and the rated voltage of the insulated gate bipolar transistor is checked. According to the difference in the actual rated voltage of each insulated gate bipolar transistor, the feedback voltage is automatically adjusted, and it is converted into a voltage signal and displayed on the voltage digital display. Then, according to the comparison of the inspection data with the factory parameters of the insulated gate bipolar transistor, it is possible to intuitively distinguish whether the insulated gate bipolar transistor is qualified. In general, the highest rated voltage borne is higher than the factory parameters for qualified, and lower than the factory parameters for unqualified, thereby judging the insulation of the insulated gate bipolar transistor.
[0077] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A container terminal dedicated insulated gate bipolar transistor inspection equipment, characterized in that: include: A power conversion module (1), the input end of which is used to connect to the mains to output a DC driving power supply; A DC voltage supply module (3) is coupled to the power conversion module (1), and has a rated voltage detection terminal between its positive phase output terminal and its negative phase output terminal for coupling to the insulated gate bipolar transistor to be tested; A boost module (2), coupled to the DC voltage supply module (3), and used to gradually increase the output voltage of the DC voltage supply module (3); An automatic shut-off module (4) is coupled to the DC voltage supply module (3) and the boost module (2) so as to shut down and reset the boost module (2) after the insulated gate bipolar transistor to be tested breaks down, so that the DC voltage supply module (3) stops outputting voltage; and a voltage detection display module (6), coupled to the DC voltage supply module (3), for displaying the breakdown voltage of the insulated gate bipolar transistor to be tested to personnel; A trigger operation module (7) is coupled to the power conversion module (1), and an output end thereof has a trigger operation detection port for accessing the insulated gate bipolar transistor to be tested, so as to trigger the insulated gate bipolar transistor to be tested to be turned on; and a trigger current display module (8), coupled to the trigger operation module (7), for displaying to personnel the gate current of the insulated gate bipolar transistor to be tested when it is triggered to conduct; The power conversion module (1) comprises a DC main power module (11), coupled to the boost module (2) and used to supply voltage to the boost module (2); and a DC auxiliary power module (12), coupled to the trigger operation module (7) and connected in parallel with the DC main power module (11) and used to supply voltage to the trigger operation module (7); The boost module (2) comprises an IC6 chip and a MOSFET tube Q1; The DC voltage supply module (3) comprises a diode D6 and a transformer T3, one end of the primary coil of the transformer T3 is coupled to the pin connection point of the IC6 chip, and the other end is coupled to the drain of the MOSFET tube Q1, one end of the secondary coil of the transformer T3 is coupled to the anode of the diode D6, and the other end is grounded, and the cathode of the diode D6 is coupled to a resistor R15; The automatic shutoff module (4) comprises a diode D8 and a voltage regulator diode D7, wherein the anode of the diode D8 is coupled to the gate of the insulated gate bipolar transistor to be tested, the cathode of the diode D8 is coupled to the cathode of the voltage regulator diode D7, and the anode of the voltage regulator diode D7 is grounded.
2. The insulated gate bipolar transistor inspection equipment for container terminals according to claim 1, characterized in that: Also includes: The trigger voltage display module (9) is coupled to the trigger operation module (7), detects the gate-source voltage of the insulated gate bipolar transistor to be tested and displays it to personnel.
3. The insulated gate bipolar transistor inspection equipment for container terminals according to claim 1, characterized in that: The trigger operation module (7) is coupled to a sound reminder module (10), and the sound reminder module (10) is used to be turned on after the insulated gate bipolar transistor to be tested is triggered and turned on.
4. The insulated gate bipolar transistor inspection equipment for container terminals according to claim 1, characterized in that: The DC main power supply module (11) is coupled to a voltage stabilizing module (15), and the voltage stabilizing module (15) is used to keep the output voltage of the DC main power supply module (11) stable.
5. The insulated gate bipolar transistor inspection equipment for container terminals according to claim 1, characterized in that: The output end of the DC main power supply module (11) is coupled to a controllable precision voltage stabilizing source TL431, so that its output voltage remains stable.
6. The insulated gate bipolar transistor inspection equipment for container terminals according to claim 1, characterized in that: The boost module (2) is coupled to a start indication module (21), and the start indication module (21) is used to provide a light indication to personnel after the boost module (2) is started.
7. The insulated gate bipolar transistor inspection equipment for container terminals according to claim 1, characterized in that: The voltage detection display module (6) comprises: A voltage collection unit (61), coupled to the DC voltage supply module (3), used for collecting the voltage at both ends of the DC voltage supply module (3) and outputting a rated voltage signal; And a rated voltage display device (62) is coupled to the voltage collection unit (61), has an electronic display screen, receives the rated voltage signal, and responds by displaying the rated voltage value on the electronic display screen.