Patent ID: 8514541

Claim:
An injector drive circuit comprising: an input side capacitor to which a voltage of a battery is applied; a boost coil having one end coupled to a positive pole of the input side capacitor; a first switch element coupled to the other end of the boost coil; a rectifying element coupled to the other end of the boost coil; an output side capacitor coupled to the rectifying element; a second switch element coupled to a positive pole of the output side capacitor; an injection valve coupled to the second switch element; a third switch element coupled between a negative pole of the output side capacitor and the positive pole of the input side capacitor; a fourth switch element coupled between the negative pole of the output side capacitor and a negative pole of the input side capacitor; a first opening/closing command signal generating unit for supplying an opening/closing command signal to the first switch element, the third switch element and the fourth switch element; and a second opening/closing command signal generating unit for supplying an opening/closing command signal to the second switch element, the first opening/closing command signal generating unit bringing the third switch element to a closed state and the fourth switch element to an open state during a period in which the second switch element is held in a closed state, the first opening/closing command signal generating unit bringing the third switch element to an open state and the fourth switch element to a closed state during at least part of a boost period of the output side capacitor.