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:
Jun. 07, 2011
Filed:
May. 09, 2007
Shigefumi Odaohara, Yamato, JP;
Shigefumi Odaohara, Yamato, JP;
Lenovo (Singapore) Pte. Ltd., Singapore, SG;
Abstract
There is provided a power supply capable of reducing switching elements. In a power supply, an AC/DC adaptersupplies electric power to a loadand a battery charger. The battery charger comprises a high side FETand a low side FETwhich operate according to a synchronous rectification method, and charges batteriesand. When a commercial power supply fails, a power outage detection circuit provided in the battery charger detects the power outage, and outputs a power outage signal. The battery charger which has received the power outage signal sets the high side FET to be ON KEEP. A discharge current from the battery flows via a discharge path. This enables a reduction in the number of FETs in comparison with other power supplies.