Patent ID: 8427225

Claim:
A gate driving circuit for performing switching control on a power semiconductor element which has a gate, said gate driving circuit comprising: a constant current driving circuit which is connected to a positive power source for charging said gate to let said power semiconductor element be turned on; a gate terminal connected to said gate, which is connected to an output terminal of said constant current driving circuit; an auxiliary current supply circuit which is connected to the output terminal of said constant current driving circuit or connected to said gate terminal; a first switch which is provided in said constant current driving circuit, wherein said constant current driving circuit comprises a plurality of resistors connected in series and said first switch is connected in parallel to one of said plurality of resistors, or provided outside of said constant current driving circuit, wherein a first terminal of said first switch is connected to said positive power source and a second terminal of said first switch is connected to said gate terminal; a second switch for turning on and off said auxiliary current supply circuit; and a driving control section that outputs signals for turning on and off said first switch and said second switch.