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:
Feb. 02, 2010
Filed:
May. 08, 2006
Kazuyuki Sakakibara, Anjo Achi, JP;
Kazuyuki Sakakibara, Anjo Achi, JP;
Makita Corporation, Anjo-shi Aichi, JP;
Abstract
Object of the invention is to provide an improved technique of suitably charging a battery assembly irrespective of the kind of the battery assembly. The representative battery chargerincludes a power supply section, a detecting sectionthat detects voltage that represents a temperature index of the battery assemblya reference voltage that is compared with the detected temperature-representing voltage of the battery assembly. The battery chargerstops supplying the charging current when the temperature-representing voltage of the battery assembly reaches or exceeds the reference voltage. The reference voltage varies according to the charging voltage of the battery assembly and thus, the threshold temperature to complete the charge can be varied according to the charging voltage of the battery assembly. As a result, an overload state for the battery assembly with high charging voltage and high temperature can effectively be prevented.