Patent ID: 7372315
Filing Date: 2008-05-13
Classification: H03K

Abstract:
1. A switching circuit comprising: a semiconductor switching element having an input electrode, an output electrode and a control electrode, the input electrode being connected to a voltage source, the output electrode being connected to a load circuit; a first transistor with its collector-emitter path connected between the control electrode of the semiconductor switching element and a reference potential point; a series circuit including a second transistor and a first resistor connected to a collector-emitter path of the second transistor in series and connected to the first transistor in parallel; a control signal terminal configured to be supplied with a control signal shifting between a first level and a second level; a second resistor connected between the control signal terminal and a base of the second transistor; and a differential circuit including a first capacitor and a third resistor in series and connected between the control signal terminal and a base of the first transistor, wherein the semiconductor switching element is controlled for ON/OFF in response to the control signal.