Patent ID: 6836161
Filing Date: 2004-12-28
Classification: H03K

Abstract:
A semiconductor switch driving circuit comprising:a transformer; at least one switching device, each comprising a gate terminal and an emitter terminal; a primary side area provided on a primary side of the transformer for controlling current on the primary side of the transformer according to a control signal for controlling the at least one switching device; and a secondary side area provided on a secondary side of the transformer for directly driving the at least one switching device, wherein the primary side area and the secondary side area are arranged so as to select one operation from a first operation mode in which a voltage between the gate terminal and the emitter terminal of the at least one switching device is kept either positive or negative during at least one cycle of the control signal and a second operation mode in which the voltage between the gate terminal and the emitter terminal of the at least one switching device is switched between positive and negative within one cycle of the control signal and perform the selected operation.