How to Test IGBT( Find bad IGBT )

Introduction:

•  An insulated-gate bipolar transistor (IGBT) is a three-terminal power semiconductor device primarily used as an electronic switch which, as it was developed, came to combine high efficiency and fast switching. It is a three-terminal semiconductor device, those pin are labeled collector(C), gate(G) and emitter(E). now, i will show how to check transistor using multimeter.
• The high voltage applications like PWM, SMPS, variable speed control, AC to DC converter powered by solar and frequency converter applications which operates with a hundred’s of KHz.

method #1: using multimeter

(A)

• First turn ON digital multimeter and select continuity mode.
• Connect the test leads to the IGBT terminals. Keep test leads connected for a few seconds at like this (A) connection.
• if multimeter buzzer is ON, the IGBT is bad(damage) conditions.

(B)

• Connect the test leads to the IGBT terminals. Keep test leads connected for a few seconds at like this (B) connection. 
• if multimeter buzzer is OFF, the IGBT is good conditions.

method #2: using power supply

A

• After the connection(A) is complete, when you press the switch(LED ON Switch) - if LED is ON, the IGBT is good. else,  LED is OFF, the IGBT is bad.
• when you press the switch(LED OFF Switch) - if LED is OFF, the IGBT is good. else, the IGBT is bad.

B

• After the connection(B) is complete, when you press the switch LED is ON, the IGBT is good. else, LED is OFF, the IGBT is bad.
• when you release the switch LED is OFF, the IGBT is good. else, the IGBT is bad.