Patent ID: 8625249

Claim:
A control apparatus for an electromagnetic inductive load, the control apparatus being a circuit in which a switching element that is PWM-controlled and the electromagnetic inductive load are connected together in series between a DC power supply and a ground, and comprising: a current sensing unit which senses a regenerative current in an OFF time in a PWM driving operation of the switching element; a current detecting unit which outputs a current detection signal when a sense current sensed by the current sensing unit becomes smaller than a target current amount; a PWM signal generating unit which receives a clock signal of a given frequency and the current detection signal output from the current detecting unit, and which generates a PWM signal that is at a high level or a low level during a period from an output of a signal indicating a sense that the current detection signal becomes smaller than the target current amount, to rising or falling of the clock signal; and a driving unit which is disposed between the PWM signal generating unit and the switching element, and which controls to drive the switching element.