Detecting device for detecting IGBT

Abstract

The invention relates to a detecting device for detecting IGBT, comprising a shell and a testing circuit internally installed in the shell. The testing circuit consists of a power board, an I / O board, a central processing unit, a driver module, a micro breaker, an automatic coupling voltage regulator, a rectifying circuit, a filter circuit and an inverter circuit. A single-phase 220V, 50Hz alternating current power supply source is connected with the original edge of the automatic coupling voltage regulator in series; the secondary edge of the automatic coupling voltage regulator is connected with an AC voltmeter in parallel and inputs alternating voltage into a diode rectifier bridge module; the positive end of the automatic coupling voltage regulator is connected with a limit resistor in series, is connected with a filter capacitor, a equalizing resistor and a DC voltmeter in parallel, and is connected with a fuse in series; +P and -N bus is connected with an inverse bridge formed by an IGBT module in parallel; the output end of the inverse bridge is connected with an output resistor; and the other end of the output resistor is connected with the middle connecting point of the equalizing resistor. By detecting the PWM waveform of the output resistor, the detecting device can ensure the condition of the IGBT. The measuring method is simple and easy, time saving and labor saving, and is applicable to various IGBT detections.

Description

technical field [0001] The invention belongs to the field of testing devices for power electronic devices, and relates to a testing device for detecting IGBTs, which is suitable for testing IGBTs of power electronic devices, the main power device of frequency conversion speed control devices and inverters, and determines the quality of IGBTs through testing. and bad. Background technique [0002] With the development of power electronics technology, frequency conversion speed control devices and inverters composed of IGBTs have been widely used. However, in the process of producing frequency conversion speed control devices and inverters, how to detect whether the IGBT is good or bad has become a key process in production. To measure various technical parameters of IGBT, it is necessary to purchase a complete set of test instruments and test benches from abroad, and to build a special test room. The investment is large, the cycle is long, and professional test personnel nee...

AI Technical Summary

Problems solved by technology

To measure various technical parameters of IGBT, it is necessary to purchase a complete set of test instruments and test benches from abroad, and to build a special test room. The investment is large, the cycle is long, and professional test personnel need to be trained. General enterprises cannot afford huge capital investment. However, there is no simple and easy way to measure whether the IGBT is good or bad in actual production.

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