CN113985086A

CN113985086A - Modular dipulse experiment platform

Info

Publication number: CN113985086A
Application number: CN202110367468.4A
Authority: CN
Inventors: 裘鹏; 丁超
Original assignee: Electric Power Research Institute of State Grid Zhejiang Electric Power Co Ltd
Current assignee: Electric Power Research Institute of State Grid Zhejiang Electric Power Co Ltd
Priority date: 2021-04-06
Filing date: 2021-04-06
Publication date: 2022-01-28

Abstract

The invention provides a modularized double-pulse experimental platform which comprises a power supply system, a double-pulse control board, a reactor and measuring equipment. The power supply system comprises a circuit breaker, a voltage regulator, a rectifying circuit and a switching power supply. The double-pulse control panel comprises an FPGA circuit, a key and a display screen. The reactor is mainly used as a load. The measuring equipment comprises an oscilloscope and a universal meter. The power supply system mainly provides power direct current and a low-voltage digital power supply required by the experimental platform. The input end of the circuit breaker is connected with three-phase commercial power, and the output end of the circuit breaker is connected with the voltage regulator and the switching power supply. The output end of the voltage regulator is connected with the rectifying circuit. The output end of the switch power supply is connected with the double-pulse control panel to provide digital power supply required by work for the double-pulse control panel. The output of the rectifying circuit is connected with the input of the tested device, and the output of the tested device is connected with the reactor. The oscilloscope in the measuring equipment mainly records waveform data of the equipment to be measured, and the multimeter in the measuring equipment mainly measures voltage output by the rectifying circuit.

Description

Modular dipulse experiment platform

Technical Field

The invention relates to the field of power electronics, in particular to the application field of power electronic devices such as IGBT (insulated gate bipolar transistor) and Mosfet.

Background

Generally, the knowledge of a certain IGBT/Mosfet is mainly to read a corresponding data manual to acquire the using electrical condition and the environmental condition of the IGBT/Mosfet. In practice, however, the parameters described in the data sheet are tested based on the external parameters already given, and the external parameters in practical use are personalized, so that some of the parameters cannot be directly used. We need to understand the more realistic performance of IGBT/Mosfet in specific applications, and the most effective method is: "double pulse test method". The function and performance of the IGBT driving board can be evaluated through a double-pulse test; acquiring main parameters of the IGBT in the switching-on and switching-off processes; acquiring whether improper oscillation exists in the switching-on and switching-off processes; evaluating the reverse recovery behavior and the safety margin of the diode; evaluating the current sharing characteristic of the parallel connection of the IGBTs; and judging whether the voltage spike is proper when the IGBT is turned off and whether improper oscillation exists after the IGBT is turned off.

Disclosure of Invention

In order to solve the technical problem, a modularized double-pulse experimental platform is provided, which is convenient for detecting the performance of the power electronic device and obtaining relevant electrical parameters under a specific application environment.

A modularized double-pulse experimental platform comprises a power supply system, a double-pulse control board, a reactor and measuring equipment. The power supply system comprises a circuit breaker, a voltage regulator, a rectifying circuit and a switching power supply. The input end of the circuit breaker is connected with three-phase commercial power, and the output end of the circuit breaker is connected with the voltage regulator and the switching power supply. The output end of the voltage regulator is connected with the rectifying circuit. The output end of the switch power supply is connected with the double-pulse control panel to provide digital power supply required by work for the double-pulse control panel. The output of the rectifying circuit is connected with the input of the device under test. The double-pulse control panel comprises an FPGA circuit, a key and a display screen. The reactor is mainly used as a load. The measuring equipment comprises an oscilloscope and a universal meter.

Preferably, the power supply system mainly provides power direct current and low-voltage digital power supply required by the experiment platform. The input end of the power supply system is connected with the mains supply, and the output end of the power supply system is connected with the tested equipment and the double-pulse control board.

Preferably, the double-pulse control board comprises an FPGA circuit, a key and a display screen, a working power supply required by the double-pulse control board is provided by a power supply system, and a double-pulse signal generated by the double-pulse control board is transmitted to a receiving end of the tested equipment through an optical fiber.

Preferably, the reactor is mainly used as a load, and the reactor has various ranges of 0.1 mH-0.5 mH. And the input end of the reactor is connected with the output end of the tested device.

Preferably, the measuring device comprises an oscilloscope and a multimeter. The oscilloscope in the measuring equipment mainly records waveform data of the equipment to be measured, and the multimeter in the measuring equipment mainly measures voltage output by the rectifying circuit.

Preferably, the thin film capacitor C in the rectifying circuit is further provided with a load relief circuit, when the experiment is completed, the air switch K1 is closed, and the electric quantity stored in the thin film capacitor C is consumed through the resistor R1.

Preferably, the thin film capacitor C in the rectifying circuit is further provided with a pre-charging circuit, and when an experiment is performed, in order to avoid generating a large current surge, the switch K2 is opened, the thin film capacitor C is pre-charged through the pre-charging circuit, and the switch K2 is closed when the voltage rises to a certain value.

Compared with the prior art, the invention has the beneficial effects that: 1. the modular design idea is convenient for maintenance and management of the system, and when a certain module breaks down, the module can be replaced, so that the maintenance is convenient; 2. the voltage regulator is mainly used for carrying out voltage-reducing transformation on three-phase mains supply, so that a wide-range voltage is output after passing through the rectifying circuit, and the requirements of voltage tests required by different tested equipment are met; 3. the keys in the double-pulse control panel are matched with the display screen to operate, so that the duration time of the double-pulse high level and the duration time of the double-pulse low level can be set.

Drawings

FIG. 1 is a system block diagram of the present invention;

FIG. 2 is a rectifier circuit;

FIG. 3 is a dual pulse control board;

FIG. 4 is an H half bridge;

FIG. 5 is a pre-charge bleed circuit;

in the drawings, the reference numbers: the device comprises a circuit breaker 1, a switching power supply 2, a double-pulse control board 3, a power frequency voltage regulator 4, a rectifying circuit 5, a universal meter 6, an oscilloscope 7, a reactor 8, a power supply system 9, a measuring device 10, an FPGA control circuit 11, a key 12 and a display screen 13.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

A modularized double-pulse experimental platform is shown in figures 1-5 and comprises a power supply system 9, a measuring device 10, a double-pulse control board 3 and a reactor 8. The power supply system 9 comprises a circuit breaker 1, a switching power supply 2, a power frequency voltage regulator 4 and a rectifying circuit 5. The measuring device 10 comprises a multimeter 6, an oscilloscope 7. The input end of the circuit breaker 1 is connected with three-phase commercial power, and one output end of the circuit breaker is connected with the voltage regulator 4 and the other output end is connected with the switching power supply 2. The output end of the voltage regulator 4 is connected with the rectifying circuit 5. The output end of the switch power supply 2 is connected with the double-pulse control panel 3 to provide digital power supply required by work for the double-pulse control panel 3. The output of the rectifying circuit 5 is connected to the input of the device under test, the output of which is connected to the reactance 8. The oscilloscope 7 in the measuring device 10 mainly records waveform data of the device to be measured, and the multimeter 6 in the measuring device 10 mainly measures voltage output by the rectifying circuit.

The rectifying circuit 5 comprises a rectifying bridge composed of 6 diodes and a thin film capacitor C, as shown in fig. 2. The film capacitor C filters the sine pulsating voltage rectified by the diode, so that the voltage is in a stable state. The thin film capacitor C is also provided with a charge discharging circuit, as shown in fig. 5, when the experiment is completed, the air switch K1 is closed, and the stored electric quantity in the thin film capacitor C is consumed through the resistor R1.

As shown in fig. 5, in order to avoid large current impact during an experiment, the switch K2 is opened, the thin film capacitor C is precharged through the precharge circuit, and the switch K2 is closed when the voltage rises to a certain value.

The double-pulse control board 3 comprises an FPGA control circuit 12, a key 11 and a display screen 13, as shown in FIG. 3. The required time period of the double pulse is set through the keys, and the currently set value can be displayed on the display screen in real time.

The present invention is described by taking an H half bridge as an example, and a circuit diagram of the H half bridge is shown in fig. 4. The test is performed by using the diodes of the switch tube S2 and the switch tube S1 as the objects to be tested. The inductance Ls is the stray inductance of the line. The inductor L is a reactor 8 and is used as a load. The dc power supply for the H half bridge is from the rectifier circuit. The switch tube S1 is always in the off state during the test. The double-pulse signal required by the switch tube S2 comes from the double-pulse control board 3, wherein the time of T1, T2 and T3 can be set manually according to the requirement through the keys and the display screen in the double-pulse control board 3. The oscilloscope 7 high voltage probe and current probe in the measuring device 10 respectively measure the terminal voltage Vds of S2 and the current Ic in the circuit.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a modular dipulse experiment platform, a serial communication port, including electrical power generating system, the dipulse control panel, the reactor, measuring equipment, electrical power generating system's the external three-phase commercial power of input, equipment under test and dipulse control panel are connected to the output, the dipulse control panel output pulse signal transmits for equipment under test through optic fibre, equipment under test's output is connected with the reactor, oscilloscope mainly takes notes equipment under test's waveform data among the measuring equipment, universal meter mainly measures the voltage of rectifier circuit output among the measuring equipment.

2. The double-pulse experimental platform of claim 1, wherein the power supply system comprises a circuit breaker, a voltage regulator, a rectifying circuit and a switching power supply. The input end of the circuit breaker is connected with a three-phase commercial power, the output end of the circuit breaker is connected with the voltage regulator, the other end of the circuit breaker is connected with the switching power supply, the output end of the voltage regulator is connected with the rectifying circuit, and the output of the rectifying circuit is connected with the input of the tested equipment. The output end of the switch power supply is connected with the double-pulse control panel.

3. The dipulse experimental platform of claim 1, wherein the dipulse control board comprises an FPGA circuit, a key and a display screen, and the key is matched with the display screen and connected with the FPGA circuit.

4. The double-pulse experimental platform of claim 1, wherein the reactor is a multi-range reactor, and a suitable inductance wiring can be selected according to requirements, and the reactor is mainly used as a load.

5. The double-pulse experimental platform of claim 1, wherein said measuring equipment comprises an oscilloscope and a multimeter.

6. The dipulse experimental platform of claim 2, wherein the voltage regulator is configured to perform buck-boost conversion on a three-phase mains supply, so that a wide range of voltages is output after passing through the rectifying circuit, and requirements of different voltage tests required by different devices to be tested are met.

7. The double-pulse experimental platform of claim 2, wherein the rectifying circuit comprises a rectifying bridge and a capacitor plate, and an output of the rectifying bridge is connected with the capacitor plate.

8. The double-pulse experimental platform of claim 5, wherein the probes of the oscilloscope are high-voltage differential probes and high-precision current probes.