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:
Oct. 08, 2002
Filed:
Mar. 09, 2001
Other;
Abstract
A battery power source device is composed of a plurality of battery modules, in which each battery module includes a number of serially connected cells. A voltage detection circuit is associated with each battery module. Each voltage detection circuit includes a differential amplifier that detects a voltage across end terminals of the associated battery module, and the detected voltage is digitized and output through a photo-coupler to a controller. The differential amplifier is connected to the battery module through photo-relays, which are closed in response to an open/close control signal only during a voltage detection operation, so that leak currents are eliminated. The differential amplifier and an associated A/D converter are provided with operating power obtained by transforming the voltage of the battery module with regulators, whereby noise effects are eliminated.