Patent ID: 8823347

Claim:
A voltage boosting/lowering circuit comprising: an output voltage generation circuit comprising a first switch element connected between an input terminal and one end of a choke coil, and a second switch element connected between another end of the choke coil and a ground terminal, the output voltage generation circuit being configured to generate an output voltage by switching the first and second switch elements between an on-state and an off-state and thereby boosting or lowering an input voltage input to the input terminal; a first switch control unit that outputs a first pulse signal to the first switch element, the first pulse signal being used to switch the first switch element between an on-state and an off-state; a duty detection circuit that detects a duty of the first pulse signal; and a second switch control unit that outputs a second pulse signal to the second switch element, the second pulse signal being used to switch the second switch element between an on-state and an off-state according to the detected duty.