Patent ID: 7847604
Filing Date: 2010-12-07
Classification: H02M,H03K

Abstract:
1. A driving circuit of a semiconductor element for power, comprising a second semiconductor element which is connected in series with and forms a pair with a first semiconductor element which is to be driven, wherein the first semiconductor element and the second semiconductor element are driven by supplying a power supply voltage Vb to the first semiconductor element and the second semiconductor element, the driving circuit comprising: a controlling circuit which controls, in a switching manner, at least one of a gate resistance, an applied voltage on a gate, and a gate input capacitance of the first semiconductor element during an OFF operation of the first semiconductor element; and a detecting circuit which detects a voltage Vak of the second semiconductor element, wherein the controlling circuit controls, in a switching manner, at least one of the gate resistance, the applied voltage on the gate, and the gate input capacitance at a point in time when a first predetermined time has elapsed from a time when the voltage Vak detected by the detecting circuit reaches a first predetermined voltage ΔV