EMITTER SWITCHED THYRISTOR USING PROTECTION CIRCUIT TO IMPROVE SHORT-CIRCUIT WITHSTANDING CAPABILITY OF EST WITHOUT BEING COMPLICATED

摘要

PURPOSE: An emitter switched thyristor having a protection circuit is provided to improve the short-circuit withstanding capability of an EST(Emitter Switched Thyristor). CONSTITUTION: A protection circuit(200) prevents an emitter switched thyristor(100) from being broken due to a high voltage by dropping a gate voltage after detecting a voltage of a floating emitter. A transistor drops a voltage of a node A in case the voltage of the floating emitter increases more than a threshold voltage. A reset diode(202) drops a voltage of a node B in case the voltage of the gate electrode terminal(110) is zero. A resistance device(203) is connected between the gate electrode terminal of the emitter switched thyristor and a second gate electrode(110B).