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:
Mar. 20, 2007
Filed:
May. 01, 2003
Tamiji Nagai, Kanagawa, JP;
Kazuo Yamazaki, Kanagawa, JP;
Tamon Ikeda, Tokyo, JP;
Sony Corporation, , JP;
Abstract
When an output voltage of a secondary battery cell Eis obtained, only SWand SWare turned on. As a result, a capacitor Cis charged by a secondary battery cell E. With a delay of a time period ÄT, SWand SWare turned off. SWand SWare turned on. As a result, electric charges of the capacitor Care moved to a capacitor C. Those operations are repeated until the potential of the capacitor Cbecomes almost equal to the output voltage of the secondary battery cell E. When the potential of the capacitor Cbecomes almost equal to the output voltage of the capacitor C, the potential of the capacitor Cis detected by the voltage detector. A first terminal of the capacitor Cis connected to a ground potential. As a result, the voltage of the secondary battery cell Ecan be stably detected. When the secondary battery cell Eis detected, only SWis turned on. As a result, the capacitor Cis charged by the secondary battery cell E. The potential of the capacitor Cis detected by the voltage detector. The voltage detectoris used in common with the secondary battery cells Eand E. As a result, fluctuations of detected results can be prevented. In addition, using that method, a circuit power can be supplied by the capacitor C