Test and maintenance device for IGBT (Insulated Gate Bipolar Translator) driver board of traction system for subway

Abstract

The utility model discloses a subway traction system IGBT driver board test maintenance device, which comprises an upper computer, a test circuit and a load circuit which are connected in sequence, the test circuit comprises a driver board power supply circuit, a driving signal input circuit, a transition board and a driving signal acquisition circuit, the upper computer is communicated with a built-in signal generator, and the load circuit is communicated with the built-in signal generator. The load circuit comprises an IGBT and a work indicating lamp circuit. The utility model has the beneficial effects that the working state of the board card can be observed in a ground laboratory, the test is convenient, the efficiency is improved, the occurrence of potential safety hazards when the metro vehicle is stopped in a declared manner and when the working state of the board card is observed under a high-voltage state is avoided, the safety of personnel and equipment is improved, the test conditions under various working conditions are simulated, and the test efficiency is improved. The application range is wider, the device is provided with a universal interface, the universality is higher, and the cost is saved.

Description

Technical Field

[0001] The utility model relates to the field of subway traction drive boards, and particularly relates to a test and maintenance device for an IGBT drive board of a subway traction system. Background Art

[0002] 1. Generally, the positive line failure rate of the drive board of the traction inverter of subway vehicles is relatively high. Since this board is installed under the vehicle and can only work when the subway vehicle is powered on, due to safety issues, it is impossible for the staff to directly observe the true working state of the board.

[0003] 2. When analyzing the cause of the board failure, there is no test board device, so the cause of the failure cannot be analyzed.

[0004] 3. Due to the technical blockade of the manufacturer, without a test device, it is impossible to verify the authenticity of the test report given by the manufacturer, and one can only passively accept it.

[0005] 4. This board is the core product of the supplier, and the manufacturer does not provide maintenance at the board level. The entire traction module needs to be returned to the manufacturer for maintenance, which has a long maintenance cycle and the maintenance cost is tens of thousands of yuan. Content of the Utility Model

[0006] In order to overcome the problems of relatively high positive line failure rate of the drive board of the traditional subway vehicle traction inverter, inability to analyze the cause of the failure, long maintenance cycle, and high maintenance cost, etc., the utility model provides a test and maintenance device for an IGBT drive board of a subway traction system.

[0007] The technical solution adopted by the utility model to achieve the above purpose is: it includes a host computer, a test circuit, and a load circuit connected in sequence. The test circuit includes a drive board power supply circuit, a drive signal input circuit, a transition board, and a drive signal acquisition circuit. The drive board power supply circuit includes a drive board, a voltmeter, an ammeter, an anti-reverse connection circuit, and a DC15V power supply module. The drive signal input circuit includes a built-in signal generator, a signal generator, and a PWM drive signal interface component. The drive signal acquisition circuit includes an oscilloscope probe 1, an oscilloscope probe 2, an oscilloscope probe 3, an oscilloscope probe 4, and an oscilloscope probe 5. The host computer communicates with the built-in signal generator. The load circuit includes an IGBT and a working indicator light circuit. The IGBT includes an IGBT 1, an IGBT 2, a load resistor 1, a load resistor 2, a DC12V power supply module 1, and a DC12V power supply module 2. The working indicator light circuit includes a working indicator light 1 and a working indicator light 2.

[0008] The host computer is a communication software with independent programming.

[0009] The test circuit is built on a frame assembled by profiles.

[0010] The load circuit is built on a frame assembled by profiles.

[0011] 1. Host computer

[0012] The host computer is a communication software with self-programming, installed on an industrial control computer, connected to the built-in signal generator of the test platform, communicates through the RS232 serial port, sends instructions to the built-in signal generator, and the built-in signal generator sends a drive signal with adjustable frequency and duty cycle after receiving the instructions from the host computer.

[0013] 2. Test circuit

[0014] The test circuit is the core circuit of this device, including a drive board power supply circuit, a drive signal input circuit, and a drive signal acquisition circuit.

[0015] (1) Drive board power supply circuit

[0016] The drive board power supply circuit is powered by a DC15V power supply module. After the DC15V power supply module is connected in series with an anti-reverse connection circuit and an ammeter, it is connected to the drive board power supply interface, and a voltmeter is connected in parallel at the drive board power supply interface. The anti-reverse connection circuit is used to prevent the positive and negative poles of the DC15V power supply module from being connected reversely, resulting in component damage. The ammeter is used to display the real-time current when the drive board is working, and the voltmeter is used to display the real-time voltage when the drive board is working, to assist in judging whether there is abnormal power consumption when the drive board is working.

[0017] (2) Drive signal input circuit

[0018] The drive signal input circuit is divided into two parts. One part is generated by the built-in signal generator, and the other part is generated by the signal generator. The drive signals sent by the built-in signal generator and the signal generator enter the signal input end of the drive board through the PWM drive signal interface component. The PWM drive signal interface component has a signal switch. When a group of drive signal circuits is selected, the other group of signal circuits is automatically disconnected. The built-in signal generator can send a drive signal with adjustable frequency and duty cycle. At the same time, the built-in signal generator can also receive instructions from the host computer through the RS232 serial port communication. After receiving the instructions from the host computer, the built-in signal generator sends a drive signal with adjustable frequency and duty cycle.

[0019] The PWM drive signal interface component is connected to the signal input terminal interface of the drive board. The PWM signal enters the drive board through the PWM drive signal interface component. After the PWM signal enters the drive board, the drive board processes the PWM signal, and at the same time, two PWM signals are generated at signal output terminal one and signal output terminal two of the drive board respectively. This signal passes through the transition board and is applied to the G poles of IGBT one and IGBT two to control the conduction and cutoff of IGBT one and IGBT two respectively. The function of the transition board is to transmit the drive signal and control the fast conduction and fast cutoff of the IGBT to prevent the IGBT from entering the latch-up effect.

[0020] (3) Drive signal acquisition circuit

[0021] The drive signal acquisition circuit is to collect the PWM waveform at the signal input terminal of the drive board through oscilloscope probe one, oscilloscope probe two is used to collect the PWM waveform at signal output terminal one, oscilloscope probe three is used to collect the PWM waveform at the G pole of IGBT one, oscilloscope probe four is used to collect the PWM waveform at signal output terminal two of the drive board, and oscilloscope probe five is used to collect the PWM waveform at the G pole of IGBT two. Through the above oscilloscope, the amplitude, frequency and waveform of the signal can be seen during the entire transmission process of the PWM drive signal, and it can be judged whether the drive signal is normal during the entire transmission process.

[0022] 3. Load circuit

[0023] The load circuit is used to test the driving ability of the drive board under loaded conditions

[0024] In the main circuit of IGBT one, it is powered by power supply module one of DC12V. A working indicator light one and a high-power load resistor one are connected in series, and the C pole of IGBT one is connected. The E pole of IGBT one is directly connected to the negative pole of power supply module one of DC12V. Through the working indicator light one, it can be observed whether IGBT one is working, and at the same time, the driving ability of the drive board and whether the IGBT1 component is normal can be detected.

[0025] In the main circuit of IGBT two, it is powered by power supply module two of DC12V. A working indicator light two and a high-power load resistor two are connected in series, and the C pole of IGBT two is connected. The E pole of IGBT two is directly connected to the negative pole of power supply module two of DC12V. Through the working indicator light two, it can be observed whether IGBT two is working, and at the same time, the driving ability of the drive board and whether the IGBT two component is normal can be detected.

[0026] The beneficial effects of the present utility model are:

[0027] 1. Through this device, the working state of the board can be observed in the ground laboratory, which is convenient for testing, improves efficiency, and reduces the detention time of subway vehicles.

[0028] 2. By using this device, the occurrence of potential safety hazards when observing the working state of the under-vehicle board card under high-voltage conditions is avoided, improving the safety of personnel and equipment;

[0029] 3. This device can simulate test conditions under various working conditions by using a built-in signal generator or a signal generator to give signals, with a wider application range;

[0030] 4. The traction inverter drive board of the subway vehicle has a general architecture, and this device has a general interface, with stronger versatility.

[0031] 5. Master the working principle of the traction inverter drive board of the subway vehicle, facilitate observing the working state of the drive board, and have the ability to test and repair the traction inverter drive board of the subway vehicle to a certain extent.

[0032] 6. For a faulty drive board, this device can be used for detection, and the collected parameters can be compared with the normal parameters marked on the schematic diagram to lock the cause of the fault and repair the drive board, meeting the conditions for in-depth repair of the drive board.

[0033] 7. This device has been successfully applied to vehicle maintenance. So far, 2 traction inverter drive boards of Line 3 vehicles have been successfully repaired. After being installed on the vehicle, the dynamic adjustment function is normal. Currently, the vehicle has traveled a cumulative distance of 200 kilometers after being installed, saving more than 800,000 yuan.

[0034] Benefit calculation method: Since the traction power module is produced by Alstom and the drive board is not sold separately, the minimum purchase unit is the power module. According to the latest purchase price, the unit price of the power module is 410,520.00 yuan (including tax). Repairing 2 pieces saves more than 800,000 yuan. Description of the Drawings

[0035] Figure 1 It is a design principle block diagram of a test and repair device for the IGBT drive board of a subway traction system; Detailed Implementation Manner

[0036] Such as Figure 1As shown in the figure, a test and maintenance device for the IGBT drive board of a traction system for subways according to the present utility model includes a host computer, a test circuit, and a load circuit that are connected in sequence. The test circuit includes a drive board power supply circuit, a drive signal input circuit, a transition board, and a drive signal acquisition circuit. The drive board power supply circuit includes a drive board, a voltmeter, an ammeter, an anti-reverse connection circuit, and a DC15V power supply module. The drive signal input circuit includes a built-in signal generator, a signal generator, and a PWM drive signal interface component. The drive signal acquisition circuit includes an oscilloscope probe 1, an oscilloscope probe 2, an oscilloscope probe 3, an oscilloscope probe 4, and an oscilloscope probe 5. The host computer communicates with the built-in signal generator. The load circuit includes an IGBT and a working indicator light circuit. The IGBT includes an IGBT 1, an IGBT 2, a load resistor 1, a load resistor 2, a DC12V power supply module 1, and a DC12V power supply module 2. The working indicator light circuit includes a working indicator light 1 and a working indicator light 2.

[0037] The host computer is a communication software with self-programming.

[0038] The test circuit is built on a frame assembled by profiles.

[0039] The load circuit is built on a frame assembled by profiles.

[0040] 1. Host computer

[0041] The host computer is a communication software with self-programming, installed on an industrial control computer, connected to the built-in signal generator of the test platform, communicates through the RS232 serial port, sends instructions to the built-in signal generator, and the built-in signal generator sends drive signals with adjustable frequency and duty cycle after receiving the instructions from the host computer.

[0042] 2. Test circuit

[0043] The test circuit is the core circuit of this device, including a drive board power supply circuit, a drive signal input circuit, and a drive signal acquisition circuit.

[0044] (1) Drive board power supply circuit

[0045] The drive board power supply circuit is powered by a DC15V power supply module. After the DC15V power supply module is connected in series with an anti-reverse connection circuit and an ammeter, it is connected to the drive board power supply interface, and a voltmeter is connected in parallel at the drive board power supply interface. The anti-reverse connection circuit is used to prevent the positive and negative poles of the DC15V power supply module from being connected reversely, resulting in component damage. The ammeter is used to display the real-time current when the drive board is working, and the voltmeter is used to display the real-time voltage when the drive board is working, to assist in judging whether there is abnormal power consumption when the drive board is working.

[0046] (2) Drive signal input circuit

[0047] The drive signal input circuit is divided into two parts. One part is generated by the built-in signal generator, and the other part is generated by the signal generator. The drive signals sent by the built-in signal generator and the signal generator enter the signal input end of the drive board through the PWM drive signal interface component. The PWM drive signal interface component has a signal switching switch. When a group of drive signal circuits is selected, the other group of signal circuits is automatically disconnected. The built-in signal generator can send drive signals with adjustable frequency and duty cycle. At the same time, the built-in signal generator can also communicate with the upper computer through the RS232 serial port. The upper computer sends instructions to the built-in signal generator, and the built-in signal generator sends drive signals with adjustable frequency and duty cycle after receiving the instructions from the upper computer.

[0048] The PWM drive signal interface component is connected to the signal input end interface of the drive board. The PWM signal enters the drive board through the PWM drive signal interface component. After the PWM signal enters the drive board, the drive board processes the PWM signal. At the same time, two PWM signals are generated at the signal output end one and the signal output end two of the drive board respectively. These signals pass through the transition board and are applied to the G poles of IGBT one and IGBT two respectively, to control the conduction and cut-off of IGBT one and IGBT two respectively. The role of the transition board is to transmit the drive signal and control the fast conduction and fast cut-off of the IGBT, to prevent the IGBT from entering the latch-up effect.

[0049] (3) Drive signal acquisition circuit

[0050] The drive signal acquisition circuit is to collect the PWM waveform at the signal input end of the drive board through the oscilloscope probe one, the oscilloscope probe two is used to collect the PWM waveform at the signal output end one, the oscilloscope probe three is used to collect the PWM waveform at the G pole of IGBT one, the oscilloscope probe four is used to collect the PWM waveform at the signal output end two of the drive board, and the oscilloscope probe five is used to collect the PWM waveform at the G pole of IGBT two. Through the above oscilloscope, the amplitude, frequency and waveform of the signal can be seen during the whole transmission process of the PWM drive signal, to judge whether the drive signal is normal during the whole transmission process.

[0051] 3. Load circuit

[0052] The load circuit is used to test the driving ability of the drive board under loaded conditions.

[0053] In the main circuit of IGBT one, it is powered by the power supply module one of DC12V. The working indicator light one and the high-power load resistor one are connected in series, and connected to the C pole of IGBT one. The E pole of IGBT one is directly connected to the negative pole of the power supply module one of DC12V. Through the working indicator light one, it can be observed whether IGBT one works, and at the same time, the driving ability of the drive board and whether the IGBT1 component is normal can be detected.

[0054] In the IGBT two main circuits, it is powered by the DC12V power supply module two, with the working indicator light two and the high-power load resistor two connected in series, and connected to the C pole of the IGBT two. The E pole of the IGBT two is directly connected to the negative pole of the DC12V power supply module two. Through the working indicator light two, it is possible to observe whether the IGBT two is working, and at the same time detect the driving ability of the driving board and whether the IGBT two components are normal.

Claims

1. A test and maintenance device for the IGBT drive board of a traction system for subways, characterized in that: It includes a host computer, a test circuit, and a load circuit that are connected in sequence. The test circuit includes a driving board power supply circuit, a driving signal input circuit, a transition board, and a driving signal acquisition circuit. The driving board power supply circuit includes a driving board, a voltmeter, an ammeter, an anti-reverse connection circuit, and a DC15V power supply module. The driving signal input circuit includes a built-in signal generator, a signal generator, and a PWM driving signal interface component. The driving signal acquisition circuit includes oscilloscope probe 1, oscilloscope probe 2, oscilloscope probe 3, oscilloscope probe 4, and oscilloscope probe 5. The host computer communicates with the built-in signal generator. The load circuit includes an IGBT and a working indicator light circuit. The IGBT includes IGBT 1, IGBT 2, load resistor 1, load resistor 2, DC12V power supply module 1, and DC12V power supply module 2. The working indicator light circuit includes working indicator light 1 and working indicator light 2.

2. The IGBT drive board test and repair device for a subway traction system according to claim 1, characterized in that: The host computer is a communication software with self-programming.

3. The IGBT drive board test and repair device for a subway traction system according to claim 1, characterized in that: The test circuit is built on a frame assembled by profiles.

4. The IGBT drive board test and repair device for a subway traction system according to claim 1, wherein: The load circuit is built on a frame assembled by profiles.

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