| 摘要 |
PURPOSE:To improve a control response and to reduce heat generation of a circuit by charging a capacitor by a current circulated each time a first switch provided between a power source and an inductive load is opened, storing predetermined charge, and then recovering the load to the power source. CONSTITUTION:When a first switch SW1 is opened, a current is circulated to a circulation circuit including an inductive load L by electric energy stored in the load L. When a second switch SW2 is inserted in series with an inductive load driving circuit, connected in parallel with the switch SW2 for opening and closing the inductive load driving circuit and opened, the switch SW2 is closed, if a voltage across a capacitor C1 charged through the circulation circuit is decided to exceed the voltage VB of the power source, the second switch is closed. If it is decided that the second switch SW2 is closed and the first switch SW1 is closed, the second switch SW2 is closed. The capacitor is charged by the circulated current, and power source is recovered after the load is charged. |
