Patent ID: 7777437

Claim:
A switching control system comprising: a first MOS transistor and a second MOS transistor connected in series between a first power source and a second power source for sequentially passing a current through one of a single-phase inductive load and a plural-phase inductive load; an on control circuit for turning on the first MOS transistor; a resistor connected between an output terminal of the on control circuit and a gate terminal of the first MOS transistor; and a clip circuit for clipping a voltage of the output terminal of the on control circuit with respect to a voltage of a source terminal of the first MOS transistor when a voltage between the gate terminal and source terminal of the first MOS transistor is smoothed, wherein for a turn-on operation of the first MOS transistor, a current input to the gate terminal of the first MOS transistor is determined by: a clip voltage determined by the first clip circuit; a voltage between the gate terminal and source terminal of the first MOS transistor; and the resistor connected between the output terminal of the on control circuit and the gate terminal of the first MOS transistor.