Patent ID: 8890581

Claim:
A driving circuit for driving an insulated gate semiconductor device based on a voltage of an externally-inputted gate signal, the insulated gate semiconductor device having a source, a drain and a gate, a parasitic capacitor existing between the drain and the gate, the driving circuit comprising: a gate voltage controlling semiconductor device disposed between, and connecting, the gate and the source of the insulated gate semiconductor device, the gate voltage controlling semiconductor device having a source, a drain and a gate, and being driven by a current that charges the parasitic capacitor; and a depletion mode MOSFET (Metal Oxide Semiconductor Field Effect Transistor) disposed between and directly connecting the gate and the drain of the gate voltage controlling semiconductor device, the depletion mode MOSFET being configured to raise a gate voltage of the gate voltage controlling semiconductor device, so as to turn on the gate voltage controlling semiconductor device to pull-out the current at a turning-on operation of the insulated gate semiconductor device.