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. 04, 2003
Filed:
Jan. 24, 2002
Yuji Yamanaka, Atsugi, JP;
Kenichi Miki, Atsugi, JP;
Mitsumi Electric Co., Ltd., Tokyo, JP;
Abstract
An overcharge protection circuit includes an overcharge detection section for detecting whether or not a secondary battery is put into an overcharge condition, and for producing an overcharge detected signal on detection of the overcharge condition. An overcharge blind time setting circuit produces, in response to the overcharge detected signal, an OFF control signal for turning a charge control switch off after a lapse of a predetermined overcharge detection blind time interval defined by a capacitance value of a capacitor. An excessive current detection resistor detects whether or not the charging current is an excessive current. When the excessive current is detected by the excessive current detection resistor, a forcibly discharged arrangement forcibly and immediately discharges electrical charges accumulated in the capacitor, thereby immediately turning the charge control switch off upon detection of the excessive current without waiting for the lapse of the predetermined overcharge detection blind time interval.