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. 29, 2000
Filed:
Feb. 13, 1998
Hiroshi Mukainakano, Chiba, JP;
Seiko Instruments Inc., , JP;
Abstract
A charge/discharge control circuit is provided which prevents an abnormally high charging voltage from damaging a secondary cell. The charge/discharge control circuit has an overcharge detecting circuit for detecting whether the secondary cell is in an overcharged state by comparing a divided output voltage of the secondary cell with a reference voltage, a delay circuit for outputting a delayed version of an output of the overcharge detecting circuit delayed by a predetermined delay time, and a high voltage detecting circuit for detecting whether the secondary cell is in a high voltage supplying state by detecting whether a voltage of the secondary cell is more than a predetermined level higher than the overcharge detecting voltage detected by the overcharge detecting circuit. The switch circuit is turned OFF to stop charging of the secondary cell when either the overcharge state or the high voltage supplying state is detected in response to outputs of the delay circuit and the high voltage detecting circuit.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile