Patent ID: 8502572

Claim:
A gate driver for driving a gate of a switching element, comprising: a first transistor and a second transistor that are connected in a manner of totem pole to both ends of a first DC power source and have control terminals to which a pulse signal is applied; a third transistor and a fourth transistor that are connected in a manner of totem pole to both ends of a second DC power source and have first main terminals connected to the gate of the switching element; and a transformer having a primary winding and a secondary winding, the primary winding being connected to a second main terminal of one of the first and second transistors, and through a capacitor, first main terminals of the first and second transistors, and the second winding being connected to control terminals of the third and fourth transistors and the first main terminals of the third and fourth transistors, wherein a maximum duty cycle of the pulse signal is determined according to a primary winding voltage of the transformer and a forward control-terminal voltage of the third and fourth transistors.