CN112731190A - Universal tester and method applied to subway train inverter module - Google Patents
Universal tester and method applied to subway train inverter module Download PDFInfo
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Abstract
The invention discloses a universal tester and a universal testing method applied to a subway train inverter module, wherein the universal tester comprises the following steps: the device comprises an interface unit, a load unit, a control unit, a communication unit, a power supply unit and a display unit; the tester is connected into a test loop of the inverter module to be tested, the type of the test module and the position of the IGBT to be tested are selected through the liquid crystal touch screen, then the trigger pulse parameters are set, and finally the trigger switch is controlled to carry out testing. The invention can be used for the double-pulse test of the main inverter module, the auxiliary inverter module and the charger module of the subway train, and the performance of the semiconductor device IGBT in the module and the quality of the driving plate of the semiconductor device IGBT are checked.
Description
Technical Field
The invention belongs to the technical field of subway train inverters, and particularly relates to a universal tester and a universal testing method applied to a subway train inverter module.
Background
At present, urban rail transit in China has been developed from single subway to systems including subway, light rail, single rail, urban area fast rail, magnetic suspension, modern tram, passenger express system and the like, but subway still is the most main urban rail transit system. Because of the advantages of no road occupation, rapidness, safety, large passenger capacity, high speed, small interference, low energy consumption and the like, the subway becomes the main artery of the modern city, is popular in all cities, and the city meeting the requirements is also planned.
The inverter module is a core electromechanical product of a subway train, generally comprises a traction main inverter module, an auxiliary inverter module, a charger inverter module and the like, the core technology of the inverter module is still mastered by foreign manufacturers, the operation maintenance is monopolized by foreign countries for a long time, the maintenance period is long, the cost is high, the safety and the economy of subway operation are influenced, the manufacturers for carrying out the traction module maintenance in China are few, and the test equipment for the subway train inverter module is few.
In order to check the quality of module maintenance, a double-pulse test is usually performed before a high-voltage high-current test to determine the quality of a driving loop, an IGBT (insulated gate bipolar translator) and the matching between the driving loop and the IGBT, and for different inverter modules, the wiring mode and the polarity of a trigger pulse of a test loop need to be determined according to the structure of a main circuit and a test phase in the double-pulse test, so that the wiring of the test main circuit, the trigger loop and a measurement loop is frequently changed in the test process, the workload is increased, and the test efficiency is reduced. In the double-pulse test of the inverter module, high-voltage equipment, a trigger circuit, a load circuit and a measurement circuit are independent parts, although the high-voltage equipment is protected, the high-voltage equipment cannot realize targeted protection on different inverter modules, and the pulse cannot be blocked in time when the load fails, so that the test module is often damaged.
With the rapid development of the subway industry and the entering of more subway trains in the overhaul period, a double-pulse tester which can be widely applied to various inverter modules of the subway trains is urgently needed for safely, reliably and rapidly checking the maintenance quality of the inverter modules and the matching between a driving plate and an IGBT.
Disclosure of Invention
In view of the above-mentioned deficiencies of the prior art, an object of the present invention is to provide a universal tester and a method for testing an inverter module of a subway train, so as to solve the technical deficiencies of the conventional double pulse test of the inverter module of the subway train. The invention is used for safely, reliably and quickly checking the maintenance quality of the inverter module and the matching between the driving plate and the IGBT.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention relates to a universal tester applied to a subway train inverter module, which comprises: the device comprises an interface unit, a load unit, a control unit, a communication unit, a power supply unit and a display unit;
the load unit is used for simulating the load of the inverter module and acquiring test voltage and current to the control unit;
the control unit is used for controlling the closing of the contactor contacts in the load unit, generating trigger pulse signals, receiving sampling signals of the sensors, generating test data and sending the test data to the display unit;
the communication unit is used for communicating with an external computer, uploading test data and waveforms, and receiving external parameter setting values to the control unit;
the power supply unit is used for generating required voltages of various grades and providing working power supply for the inverter module driving board to be tested according to the set parameters;
the interface unit is connected with the inverter module drive board, and is used for sending a drive board working power supply generated by the power supply unit and a trigger pulse electrical signal/optical signal generated by the control unit to the inverter module drive board and receiving a feedback signal of the inverter module drive board according to the definition of an interface of the inverter module drive board to be tested;
and the display unit is used for selecting and displaying the test parameters and displaying the state of the tester in the test process.
Further, the load unit includes: the device comprises an inductor L, a voltage sensor PT, a current sensor CT, contactors K1-K6 and a wiring port; wherein the content of the first and second substances,
the voltage sensor PT is used for collecting voltage at two ends of the inductor L, and the current sensor CT is used for collecting current flowing through the inductor L;
the contactor K1-K6 is used for being closed according to control signals sent by the control unit and combining the control signals into a double-pulse test main loop with different modules in different phases;
the wiring ports comprise a port A, a port B, a port C, a port COM, a port + and a port-, and are connected with the input end and the output end of the inverter module to form a test main loop.
Further, the communication unit includes: RJ-45 Ethernet interface and RS232 serial port communication interface.
Further, the power supply unit includes: a step-down transformer loop, a rectifier bridge loop, a DC-DC loop;
the step-down transformer loop is used for stepping down the power frequency alternating current to the alternating current with the required amplitude;
the rectifier bridge loop is used for rectifying the alternating current after voltage reduction into direct current and providing power for the contactor coil, the voltage sensor PT, the current sensor CT and the display unit;
and the DC-DC loop is used for converting the rectified direct current into direct current voltage required by the control unit, the communication unit and the inverter module driving board.
Further, the control unit includes: the device comprises a sampling signal adjusting module, a trigger pulse generating module, a contactor control module, a protection module and a data processing module;
the sampling signal adjusting module is used for filtering and adjusting voltage and current sensor measured values and inverter module drive plate feedback signals received by the interface unit to generate digital signals and sending the digital signals to the data processing module;
the trigger pulse generating module is used for generating an electric signal and an optical signal of trigger pulses with corresponding polarities according to the type of the inverter module, the phase position of the IGBT, the width of the trigger pulses and the time interval parameter between the two pulses and sending the electric signal and the optical signal to the interface unit;
the contactor control module is used for generating a contactor control signal according to the selected inverter type and the IGBT phase position and sending the contactor control signal to the load unit to control the contactor to be closed;
the protection module is used for protecting a test main loop and an inverter module drive board in real time, and comprises load short circuit protection, overvoltage protection and inverter module drive board fault feedback protection, when protection is performed, the trigger pulse generation module stops generating trigger pulses, the fault indicator lamp is turned on, and the test is continued by resetting after faults are eliminated;
and the data processing module is used for processing the received various types of data, including sampling data, trigger pulse data, communication data and voltage data, and sending the processed data to the display unit.
Further, the control unit sets the width of the trigger pulse and the time interval between two pulses by a trigger pulse width D adjusting switch and a trigger pulse interval T adjusting switch.
Further, the trigger pulse generation module uses a full comparison unit of the TMS320F240 chip event manager module to generate a trigger pulse with accurate control, converts a first trigger pulse width time value into a count value, gives the count value to a full comparison register CMPR1, starts counting by a counter T1CNT, and when the count value of the counter T1CNT is equal to the value of a full comparison register CMPR1, the level of a PWM pin is inverted; and converting the trigger pulse interval time into a count value, assigning the count value to a full comparison register CMPR1, counting and comparing again until the level is turned over, finally converting the second pulse trigger pulse width time value into a count value, assigning the count value to a full comparison register CMPR1, starting counting by a counter T1CNT until the level is turned over so as to generate the required double pulses, and automatically determining by program judgment according to the type of the test module and the test phase when the high level/low level of the pulses are effective.
Furthermore, the data processing module converts the sampling value into a positive value through negation operation when the sampling voltage and the sampling current are negative values, so that the problem of negative sampling values caused by polarity reasons of voltage and current sensors in a part of test loops is solved; acquiring the highest value of the sampling voltage through operation, comparing the highest value with the overvoltage protection value, and sending a protection instruction to a protection unit if the highest value exceeds a set threshold value; obtaining the maximum value of the sampling current through operation, comparing the maximum value with a short-circuit current protection threshold value, sending a protection instruction to a protection unit if the maximum value exceeds the short-circuit current protection threshold value, and simultaneously calculating the rising rate and the average value of the sampling current; and storing the sampled voltage value, the current value and the trigger pulse waveform value according to the same time coordinate according to the rising edge/falling edge of the first trigger pulse, and sending the values to a display unit.
Further, the display unit includes: the liquid crystal touch screen is used for setting parameters and displaying data and waveforms sent by the data processing module; the fault indicator lamp is used for indicating whether the test loop is in fault.
Further, the interface unit includes: and the interface DRI is used for providing the trigger pulse electrical signal/optical signal and the driving plate working power supply to the inverter module driving plate and receiving a feedback signal of the driving plate.
The invention also provides a test method applied to the subway train inverter module, which is based on the tester and comprises the following steps:
the method comprises the following steps: acquiring configuration information of the tester through a display unit or a communication unit;
step two: generating a contactor control signal by a control unit according to the configuration information;
step three: the load unit closes the corresponding normally open node of the contactor according to the contactor control signal;
step four: generating a trigger pulse signal according to the configuration information control unit;
step five: the interface unit sends the pulse signal to the driving plate;
step six: a sensor in the load unit collects voltage and current signals;
step seven: the control unit converts the sampled electric signal into a digital signal;
step eight: the control unit processes the received digital signal to generate a test result;
step nine: the control unit judges whether the protection acts according to the protection instruction in the test result;
step ten: the display unit displays the test waveform and the measured value;
step eleven: the communication unit uploads the test result to an external computer.
The invention has the beneficial effects that:
the invention is developed aiming at the practical situation of the double-pulse test of the subway train inverter module, and solves the problems of the double-pulse test universality, complicated test wiring and low efficiency of different inverter modules of a train; the inverter module maintenance quality and the matching between the driving plate and the IGBT are guaranteed, the inverter module has multiple protection functions, the trigger pulse can be blocked in real time, and the inverter module maintenance system is safe and reliable.
Drawings
FIG. 1 is a schematic structural diagram of a general tester applied to an inverter module of a subway train according to the present invention;
FIG. 2 is an electrical schematic of the load cell of the present invention;
FIG. 3 is a schematic diagram of a test method of the present invention;
fig. 4 is a schematic diagram of a main inverter module a1 phase double pulse test connection applied to a subway train according to the present invention;
fig. 5 is a schematic diagram of a phase a1 double-pulse test connection of the auxiliary inverter module of the subway train according to the present invention;
fig. 6 is a schematic diagram of a phase a1 double pulse test connection applied to a subway train charger inverter module according to the present invention.
Detailed Description
In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention.
Referring to fig. 1, the general tester applied to the subway train inverter module of the invention comprises: the device comprises an interface unit, a load unit, a control unit, a communication unit, a power supply unit and a display unit;
the load unit is used for simulating the load of the inverter module and acquiring test voltage and current to the control unit;
referring to fig. 2, which is an electrical schematic diagram of a load unit of the present invention, the load unit includes an inductor L, a voltage sensor PT, a current sensor CT, contactors K1-K6, and a wiring port; one ends of the contactors K1 to K6 are respectively connected with the wiring ports A, B, C, COM, plus and minus, the other ends of the contactors K1 to K4 are connected with the anode of the voltage sensor PT and the anode of the inductor L after being in short circuit, and the other ends of the contactors K5 and K6 are connected with the cathode of the voltage sensor PT and the cathode of the load after being in short circuit. After the load unit receives the control signal, the corresponding contactor coil is electrified, and the normally open node is closed to form a test main loop.
The control unit is used for controlling the closing of the contactor contacts in the load unit, generating trigger pulse signals, receiving sampling signals of all the sensors, generating test data and sending the test data to the display unit;
the control unit sets the width of a trigger pulse and the time interval between two pulses through a trigger pulse width D regulating switch and a trigger pulse interval T regulating switch;
the control unit includes: the device comprises a sampling signal adjusting module, a trigger pulse generating module, a contactor control module, a protection module and a data processing module;
the sampling signal adjusting module is used for filtering and adjusting voltage and current sensor measured values and inverter module drive plate feedback signals received by the interface unit to generate digital signals and sending the digital signals to the data processing module;
the trigger pulse generating module is used for generating an electric signal and an optical signal of trigger pulses with corresponding polarities according to the type of the inverter module, the phase position of the IGBT, the width of the trigger pulses and the time interval parameter between the two pulses and sending the electric signal and the optical signal to the interface unit;
the contactor control module is used for generating a contactor control signal according to the selected inverter type and the IGBT phase position and sending the contactor control signal to the load unit to control the contactor to be closed;
the protection module is used for protecting a test main loop and a drive plate of the inverter module in real time, and comprises load short circuit protection, overvoltage protection and drive plate fault feedback protection, when in protection action, the trigger pulse generation module stops generating trigger pulses, the fault indicator lamp is lightened, and the test is continued by resetting after faults are eliminated;
and the data processing module is used for processing the received various types of data, including sampling data, trigger pulse data, communication data and voltage data, and sending the processed data to the display unit.
The trigger pulse generation module uses a full comparison unit of the TMS320F240 chip event manager module to generate a trigger pulse with accurate control, converts a first trigger pulse width time value into a count value, gives the count value to a full comparison register CMPR1, a counter T1CNT starts counting, and when the count value of the counter T1CNT is equal to the value of the full comparison register CMPR1, the PWM pin level is turned over; and converting the trigger pulse interval time into a count value, assigning the count value to a full comparison register CMPR1, counting and comparing again until the level is turned over, finally converting the second pulse trigger pulse width time value into a count value, assigning the count value to a full comparison register CMPR1, starting counting by a counter T1CNT until the level is turned over so as to generate the required double pulses, and automatically determining by program judgment according to the type of the test module and the test phase when the high level/low level of the pulses are effective.
The data processing module converts the sampling value into a positive value through negation operation when the sampling voltage and the sampling current are negative values, and solves the problem of negative sampling values caused by polarity reasons of voltage and current sensors under partial test loops; acquiring the highest value of the sampling voltage through operation, comparing the highest value with the overvoltage protection value, and sending a protection instruction to a protection unit if the highest value exceeds a set threshold value; obtaining the maximum value of the sampling current through operation, comparing the maximum value with a short-circuit current protection threshold value, sending a protection instruction to a protection unit if the maximum value exceeds the short-circuit current protection threshold value, and simultaneously calculating the rising rate and the average value of the sampling current; and storing the sampled voltage value, the current value and the trigger pulse waveform value according to the same time coordinate according to the rising edge/falling edge of the first trigger pulse, and sending the values to a display unit.
The communication unit is used for communicating with an external computer, uploading test data and waveforms, and receiving external parameter setting values to the control unit; the communication unit includes: RJ-45 Ethernet interface and RS232 serial port communication interface.
The power supply unit is used for generating voltages of various levels required by the tester and providing working power supply for the tested inverter module driving board according to the set parameters;
the power supply unit includes: a step-down transformer loop, a rectifier bridge loop, a DC-DC loop;
the step-down transformer loop is used for stepping down the power frequency alternating current to the alternating current with the required amplitude;
the rectifier bridge loop is used for rectifying the alternating current after voltage reduction into direct current and providing power for the contactor coil, the voltage sensor PT, the current sensor CT and the display unit;
and the DC-DC loop is used for converting the rectified direct current into direct current voltage required by the control unit, the communication unit and the inverter module driving board.
The interface unit is connected with the inverter module drive board, and is used for transmitting a drive board working power supply generated by the power supply unit and a trigger pulse electrical signal/optical signal generated by the control unit to the drive board and receiving a drive board feedback signal according to the definition of an inverter module drive board interface;
the interface unit includes: and the interface DRI is used for providing the trigger pulse electrical signal/optical signal and the driving plate working power supply to the inverter module driving plate and receiving a feedback signal of the driving plate.
The display unit is used for selecting and displaying test parameters and displaying the state of the tester in the test process;
the display unit includes: the liquid crystal touch screen is used for setting parameters and displaying data and waveforms sent by the data processing module; the fault indicator lamp is used for indicating whether the test loop is in fault.
The tester is connected with an AC220V single-phase power supply, becomes 18V alternating-current voltage through a step-down transformer loop, outputs stable 24V direct-current voltage through a diode bridge rectifier circuit and a filter capacitor, and is used for supplying power voltages to a contactor coil, a voltage sensor, a current sensor and a display unit; the direct current voltage obtained after rectification is subjected to stable 15V, 5V and 3.3V voltage obtained by a UA78L series voltage stabilizer to supply power for the control unit, the communication unit and the inverter module driving board.
In the liquid crystal touch screen, the types of the inverter modules to be tested, namely the main inverter module, the auxiliary inverter module and the charging and inverter module, can be selected through the main interface, after the types of the inverter modules are selected, all testing phases of the modules are displayed on the interface, and the testing phases can be selected by clicking icons.
Based on the selected inverter type and IGBT phase position, the contactor control module consults an internal data table (i.e., the programmed tables of tables 2, 3, and 4) to generate contactor control signals that are sent to the load unit.
The control unit sets the width of the trigger pulse and the time interval between two pulses through a trigger pulse width D regulating switch and a trigger pulse interval T regulating switch. According to the type of the inverter module, the rated current and rated voltage parameters of the IGBT of the module can be known, and the inductance value of the load unit inductor is known, so that the width of each trigger pulse can be reasonably set according to the following formula:
in the formula: d1 is the width of the first trigger pulse, D2 is the width of the second trigger pulse, I is the rated current of the IGBT under test, U is the rated voltage of the IGBT under test, L is the inductance of the load cell inductor, and the trigger pulse interval T is typically set to 20us-200 us.
Embodiment 1, for different inverter module types, wiring with a tester in a manner shown in table 1, selecting a test module type and a specific phase to be tested through a liquid crystal touch screen after wiring is finished, setting a trigger pulse parameter after confirmation, pressing a pulse trigger button to test after the test is ready, and observing a waveform and a voltage and current measurement value displayed on a screen; table 1 is as follows:
TABLE 1
Referring to fig. 4, a schematic diagram of a bi-pulse test connection of a1 phase (an upper bridge arm of the a phase) of the main inverter module is shown, in which positive and negative terminals of a high voltage device are connected to + HV and-HV of the main inverter module, and then to + HV and-HV of the tester, ends "a", "B", "C" and "RH" of the main inverter module are connected to ends "a", "B", "C" and "COM" of the tester, respectively, and a drive board of the a1 phase is connected to an end "DRI" of the tester; the liquid crystal touch screen selects the type of the test module as a main inverter module, the test phase is A1 phase, the contactor control module generates a contactor control signal, the contactor control signal is sent to the load unit to control the contactors K1 and K6 to be in a closed state, and K2 to K5 are in a closed state, so that a power supply "+ HV" → A1 → "A" → K1 → load L → K6 → power supply "—" HV "test loop is formed; the trigger pulse generating module generates a negative trigger pulse electrical signal and a corresponding optical signal according to the trigger pulse width and the time interval parameter between two pulses, and sends the negative trigger pulse electrical signal and the corresponding optical signal to the interface unit; and starting triggering is carried out, the IGBT of the A1 phase is conducted, the voltage sensor collects the voltage at two ends of the inductor, the current sensor collects the current flowing through the inductor, the collected signal is sent to the sampling signal adjusting module, the processed digital signal is sent to the data processing module, and finally the liquid crystal touch screen displays the waveform and the voltage and current measured value.
The high-voltage equipment comprises: the high-voltage direct-current power supply can be provided for the tested inverter module, the highest voltage reaches 1800V, the output voltage value can be adjusted through the knob, the voltage adjusting precision is smaller than 1V, the instantaneous current value generated in the double-pulse testing process can be borne, and the current value is not lower than 1600A.
The testing of other phases of the main inverter module only needs to select a corresponding testing phase in the tester, and the state of the contactor of the load unit can be seen in table 2 as follows:
TABLE 2
Example 2
Referring to fig. 5, for a schematic diagram of a connection of a 1-phase (a-phase upper bridge arm) double-pulse test of the auxiliary inverter module, positive and negative terminals of a high-voltage device are connected to + HV and-HV of the auxiliary inverter module, and then connected to + HV and-HV of a tester, ends "a", "B", "C" and "RH" of the auxiliary inverter module are connected to ends "a", "B", "C" and "COM" of the tester, respectively, and a drive board of a 1-phase is connected to an end "DRI" of the tester; the liquid crystal touch screen selects the type of the test module as an auxiliary inverter module, the test phase is A1 phase, the contactor control module generates a contactor control signal, the contactor control signals are sent to the load unit to control the contactors K1 and K6 to be in a closed state, and the contactors K2 and K5 are in a closed state, so that a power supply "+ HV" → A1 → "A" → K1 → load L → K6 → power supply "—" HV "test loop is formed; the trigger pulse generating module generates a negative trigger pulse electrical signal and a corresponding optical signal according to the trigger pulse width and the time interval parameter between two pulses, and sends the negative trigger pulse electrical signal and the corresponding optical signal to the interface unit; and starting triggering is carried out, the IGBT of the A1 phase is conducted, the voltage sensor collects the voltage at two ends of the inductor, the current sensor collects the current flowing through the inductor, the collected signal is sent to the sampling signal adjusting module, the processed digital signal is sent to the data processing module, and finally the liquid crystal touch screen displays the waveform and the voltage and current measured value.
The test of other phases of the inverter module is assisted, only a corresponding test phase needs to be selected in the tester, and the state of the contactor of the load unit can be referred to table 3;
TABLE 3
Example 3
Referring to fig. 6, a schematic diagram of a double-pulse test connection of a phase a1 (upper bridge arm of a phase a) of a charger inverter module is shown, in which positive and negative terminals of a high-voltage device are connected to + HV and HV of the charger inverter module, and then connected to + HV and-HV of a tester, an "ALT" end of the charger inverter module is connected to a "COM" end of the tester, and a drive board of a phase a1 is connected to a "DRI" end of the tester; the liquid crystal touch screen selection test module is a charger inverter module, the test phase is A1 phase, the contactor control module generates a contactor control signal, the contactor control signal is sent to the load unit to control the contactors K4 and K6 to be in a closed state, and K1 to K3 and K5 are in a separated state, so that a power supply "+ HV" → A1 → "ALT" → K4 → load L → K6 → power supply "-HV" test loop is formed; the trigger pulse generating module generates a positive polarity trigger pulse electrical signal and a corresponding optical signal according to the trigger pulse width and the time interval parameter between two pulses, and sends the positive polarity trigger pulse electrical signal and the corresponding optical signal to the interface unit; and starting triggering is carried out, the IGBT of the A1 phase is conducted, the voltage sensor collects the voltage at two ends of the inductor, the current sensor collects the current flowing through the inductor, the collected signal is sent to the sampling signal adjusting module, the processed digital signal is sent to the data processing module, and finally the liquid crystal touch screen displays the waveform and the voltage and current measured value.
Testing other phases of the charger inverter module only needs to select a corresponding testing phase in the tester, and the state of the load unit contactor can be referred to table 4;
TABLE 4
Referring to fig. 3, the testing method applied to the subway train inverter module of the invention is based on the tester and comprises the following steps:
the testing method comprises the steps that configuration information of a tester is obtained through a liquid crystal touch screen or a communication unit of a display unit, a contactor control module generates a contactor control signal according to the configuration information, a load unit closes a corresponding contactor normally open node according to the contactor control signal, a trigger pulse signal is generated according to the configuration information trigger pulse generation module, an interface unit sends the trigger pulse signal to a drive board, a testing phase IGBT action sensor collects voltage and current signals, a sampling signal adjusting module converts the sampled electrical signals into digital signals, a data processing module processes the received digital signals to generate testing results, a protection module judges whether protection acts or not according to protection instructions in the testing results, the liquid crystal touch screen displays testing waveforms and measuring values, and finally the communication unit uploads the testing results to an external computer.
While the invention has been described in terms of its preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (8)
1. The utility model provides a be applied to subway train inverter module's general tester which characterized in that includes: the device comprises an interface unit, a load unit, a control unit, a communication unit, a power supply unit and a display unit;
the load unit is used for simulating the load of the inverter module and acquiring test voltage and current to the control unit;
the control unit is used for controlling the closing of the contactor contacts in the load unit, generating trigger pulse signals, receiving sampling signals of the sensors, generating test data and sending the test data to the display unit;
the communication unit is used for communicating with an external computer, uploading test data and waveforms, and receiving external parameter setting values to the control unit;
the power supply unit is used for generating required voltages of various grades and providing working power supply for the inverter module driving board to be tested according to the set parameters;
the interface unit is connected with the inverter module drive board, and is used for sending a drive board working power supply generated by the power supply unit and a trigger pulse electrical signal/optical signal generated by the control unit to the inverter module drive board and receiving a feedback signal of the inverter module drive board according to the definition of an interface of the inverter module drive board to be tested;
and the display unit is used for selecting and displaying the test parameters and displaying the state of the tester in the test process.
2. The universal tester applied to the subway train inverter module as claimed in claim 1, wherein said load unit comprises: the device comprises an inductor L, a voltage sensor PT, a current sensor CT, contactors K1-K6 and a wiring port;
the voltage sensor PT is used for collecting voltage at two ends of the inductor L, and the current sensor CT is used for collecting current flowing through the inductor L;
the contactor K1-K6 is used for being closed according to control signals sent by the control unit and combining the control signals into a double-pulse test main loop with different modules in different phases;
the wiring ports comprise a port A, a port B, a port C, a port COM, a port + and a port-, and are connected with the input end and the output end of the inverter module to form a test main loop.
3. The universal tester applied to the subway train inverter module as claimed in claim 1, wherein said power supply unit comprises: a step-down transformer loop, a rectifier bridge loop, a DC-DC loop;
the step-down transformer loop is used for stepping down the power frequency alternating current to the alternating current with the required amplitude;
the rectifier bridge loop is used for rectifying the alternating current after voltage reduction into direct current and providing power for the contactor coil, the voltage sensor PT, the current sensor CT and the display unit;
and the DC-DC loop is used for converting the rectified direct current into direct current voltage required by the control unit, the communication unit and the inverter module driving board.
4. The universal tester applied to the subway train inverter module as claimed in claim 1, wherein said control unit comprises: the device comprises a sampling signal adjusting module, a trigger pulse generating module, a contactor control module, a protection module and a data processing module;
the sampling signal adjusting module is used for filtering and adjusting voltage and current sensor measured values and inverter module drive plate feedback signals received by the interface unit to generate digital signals and sending the digital signals to the data processing module;
the trigger pulse generating module is used for generating an electric signal and an optical signal of trigger pulses with corresponding polarities according to the type of the inverter module, the phase position of the IGBT, the width of the trigger pulses and the time interval parameter between the two pulses and sending the electric signal and the optical signal to the interface unit;
the contactor control module is used for generating a contactor control signal according to the selected inverter type and the IGBT phase position and sending the contactor control signal to the load unit to control the contactor to be closed;
the protection module is used for protecting a test main loop and an inverter module drive board in real time, and comprises load short circuit protection, overvoltage protection and inverter module drive board fault feedback protection, the trigger pulse generation module stops generating trigger pulses during protection action, and the test is continued by resetting after faults are eliminated;
and the data processing module is used for processing the received various types of data, including sampling data, trigger pulse data, communication data and voltage data, and sending the processed data to the display unit.
5. The universal tester applied to the subway train inverter module as claimed in claim 4, wherein said trigger pulse generating module generates a trigger pulse with accurate control by using a full comparison unit of the TMS320F240 chip event manager module, converts a first trigger pulse width time value into a count value, gives the count value to a full comparison register CMPR1, the counter T1CNT starts counting, and when the count value of the counter T1CNT is equal to the value of the full comparison register CMPR1, the PWM pin level is inverted; and converting the trigger pulse interval time into a count value, assigning the count value to a full comparison register CMPR1, counting and comparing again until the level is turned over, finally converting the second pulse trigger pulse width time value into a count value, assigning the count value to a full comparison register CMPR1, starting counting by a counter T1CNT until the level is turned over so as to generate the required double pulses, and automatically determining by program judgment according to the type of the test module and the test phase when the high level/low level of the pulses are effective.
6. The universal tester applied to the subway train inverter module as claimed in claim 4, wherein said data processing module converts the sampling value into a positive value by taking the inverse operation when the sampling voltage and current are negative values, so as to solve the problem of negative sampling values caused by the polarity of the voltage and current sensors in part of the test loop; acquiring the highest value of the sampling voltage through operation, comparing the highest value with the overvoltage protection value, and sending a protection instruction to a protection unit if the highest value exceeds a set threshold value; obtaining the maximum value of the sampling current through operation, comparing the maximum value with a short-circuit current protection threshold value, sending a protection instruction to a protection unit if the maximum value exceeds the short-circuit current protection threshold value, and simultaneously calculating the rising rate and the average value of the sampling current; and storing the sampled voltage value, the current value and the trigger pulse waveform value according to the same time coordinate according to the rising edge/falling edge of the first trigger pulse, and sending the values to a display unit.
7. The universal tester applied to the subway train inverter module as claimed in claim 1, wherein said interface unit comprises: and the interface DRI is used for providing the trigger pulse electrical signal/optical signal and the driving plate working power supply to the inverter module driving plate and receiving a feedback signal of the driving plate.
8. A testing method applied to a subway train inverter module is based on the tester of any one of claims 1-7, and is characterized by comprising the following steps:
the method comprises the following steps: acquiring configuration information of the tester through a display unit or a communication unit;
step two: generating a contactor control signal by a control unit according to the configuration information;
step three: the load unit closes the corresponding normally open node of the contactor according to the contactor control signal;
step four: generating a trigger pulse signal according to the configuration information control unit;
step five: the interface unit sends the pulse signal to the driving plate;
step six: a sensor in the load unit collects voltage and current signals;
step seven: the control unit converts the sampled electric signal into a digital signal;
step eight: the control unit processes the received digital signal to generate a test result;
step nine: the control unit judges whether the protection acts according to the protection instruction in the test result;
step ten: the display unit displays the test waveform and the measured value;
step eleven: the communication unit uploads the test result to an external computer.
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