Patent ID: 6018263
Filing Date: 2000-01-25
Classification: H03K

Abstract:
A trigger circuit for a field-effect-controlled power semiconductor transistor, comprising:a conducting-state MOSFET having a gate terminal, an input terminal, and an output terminal for delivering a trigger signal to a gate terminal of the field-effect-controlled power semiconductor transistor when said conducting-state MOSFET is conducting;a guard circuit operatively connected between a drain and a source of the power semiconductor transistor for generating a control signal to the gate terminal of the power semiconductor transistor and said qate terminal of said conducting-state MOSFET;said conducting-state MOSFET having a gate-to-source capacitor charged upon turn-on for switching the power semiconductor transistor into conduction, the gate-to-source capacitor remaining charged until the control signal blocks said conducting-state MOSFET; anda series circuit of a diode and a resistor, said series circuit being connected between said input terminal and said gate terminal of said conducting-state MOSFET and charging the gate-to-source capacitor.