The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 14, 2009
Filed:
May. 18, 2005
Tomoyuki Ito, Kyoto, JP;
Isao Yamamoto, Kyoto, JP;
Tomoyuki Ito, Kyoto, JP;
Isao Yamamoto, Kyoto, JP;
Rohm Co., Ltd., , JP;
Abstract
A voltage comparator of a power supply apparatus detects overshoot by comparing an output voltage with a threshold voltage. The power supply apparatus is provided with three switches. Upon detection of overshoot, the boosting operation of a booster circuit is suspended and the first through third switches are turned on. While the boosting operation is being suspended, the second switch operates to lower the output voltage. Concurrently, the first and third switches operate to forcibly lower an input voltage to allow the output voltage, occurring after the boosting operation is resumed, to approach a preset voltage.