Patent ID: 6271708
Filing Date: 2001-08-07
Classification: H03K

Abstract:
A gate circuit having a turn-off gate circuit which comprising:a first OFF gate power source of which one terminal that becomes the power source when a semiconductor switching element turns off is connected to an emitter of the semiconductor switching element;a first switch that connects the other terminal of said first OFF gate power source and a gate of said semiconductor switching element via a first resistor;a second OFF gate power source, of which one terminal that has a greater absolute value than said first OFF gate power source is connected to an emitter of said semiconductor switching element; anda second switch for connecting the other terminal of said second OFF gate power source and said gate of said semiconductor switching element,wherein said second switch is connected to said gate of said semiconductor switching element via a second resistor that has a smaller resistance than said first resistor, and said second switch is closed at a specified time interval after said first switch has been closed.