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:
Jan. 18, 2000
Filed:
Nov. 21, 1997
Kazuo Hasegawa, Miyagi-ken, JP;
Daisuke Takai, Miyagi-ken, JP;
Alps Electric Co., Ltd., , JP;
Abstract
An battery-driven electronic apparatus incorporating battery has a source battery, a driven circuit driven by the battery, a pair of external terminals connected to the both ends of the source battery and a capacitor provided between the source battery and the external terminals. A circuit for identifying voltage of a battery having a pair of checking terminals, a resistor, a transistor, a peak hold circuit, a multiplexor, a temperature measuring circuit, an A/D converter and an identification control circuit including an arithmetic circuit and an identification circuit is employed to identify voltage of the source battery of the electronic apparatus incorporating battery by coupling the pair of the checking terminals with the pair of the external terminals of the electronic apparatus incorporating battery, measuring voltages of the source battery repeatedly and calculating voltage differences by the arithmetic circuit for identifying whether the battery is usable or not by comparing voltage differences with predetermined values in the identification circuit without removing the source battery with minimal power consumption.