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:
Aug. 11, 2009
Filed:
Aug. 26, 2005
Nobuyuki Ohtaka, Osaka, JP;
Nobuyuki Ohtaka, Osaka, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
A power voltage of a battery (including a secondary battery) mounted on a portable device drops with use or the like of the portable device. Therefore, a step-up switching voltage regulator circuit is mounted on the portable device. On the other hand, the power voltage of the battery exceeds a voltage necessary for driving the portable device sometimes when the battery is fully charged. In this case, when the step-up switching voltage regulator circuit is driven, the power is consumed in vain, and a burden is imposed on the battery. The step-up switching voltage regulator circuit of the present embodiment switches an output in accordance with the power voltage, that is, raises the power voltage supplied from the battery to a predetermined output voltage, and outputs the output voltage, when the power voltage supplied from the battery is smaller than the predetermined output voltage; on the other hand, the step-up switching voltage regulator circuit outputs the power voltage supplied from the battery as the output voltage, when the power voltage supplied from the battery is larger than the predetermined output voltage; and consequently, in the step-up switching voltage regulator circuit, the burden on the battery mounted on the portable device can be reduced.