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:
Nov. 06, 2012
Filed:
Aug. 23, 2010
Kazuki Morita, Osaka, JP;
Yohsuke Mitani, Osaka, JP;
Kazuki Morita, Osaka, JP;
Yohsuke Mitani, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
In an energy storage device, a charging circuit is electrically coupled to the energy storage section. A first comparator is electrically coupled to an energy storage section, and its output is inverted when voltage Vc of the energy storage section reaches first predetermined voltage Vc. A second comparator is electrically coupled to the energy storage section, and its output is inverted when voltage Vc of the energy storage section reaches second predetermined voltage Vc. A control circuit is electrically coupled to the first comparator and the second comparator. The control circuit obtains period tm from inversion of the output of the first comparator to the output of the second comparator. Capacitance C of the energy storage section is calculated based on this period tm and voltage change width ΔVc between the first predetermined voltage Vcand the second predetermined voltage Vc