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When mine fan is driven by power inverter, the high-power inverter maybe used to drive low-power motors, so the short-circuit protection threshold of the IGBT needs to be adjusted online. Firstly, the principle of DESAT function of IGBT driver chip is analyzed, then the detection threshold adjustment circuit is designed by using precision voltage reference and voltage comparator, and the method of real-time threshold adjustment by PWM wave with different duty ratio is designed. Experiments show that the IGBT overcurrent detection circuit can respond and act quickly and accurately, so that the IGBT can be protected in time and effectively under different overcurrent conditions.

An IGBT short-circuit protection method using variable VCE detection threshold

An IGBT short-circuit protection method using variable V_CE detection threshold