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. 11, 2003
Filed:
Oct. 30, 2001
Brian Thomas, San Francisco, CA (US);
Jean-Marc Beaufils, Mountain View, CA (US);
Adrian Cogan, Redwood City, CA (US);
Bernard Dallemange, Osny, FR;
Gilles Gozlan, Le Mesnil Theribus, FR;
Jiyuan Luan, Fremont, CA (US);
Neill Thornton, Turlock, CA (US);
James Toth, San Carlos, CA (US);
Tyco Electronics Corporation, Middletown, PA (US);
Abstract
A protection circuit for use with a charger and a chargeable element, such as a rechargeable lithium ion battery, comprises a shunt regulator having a threshold ON voltage coupled in parallel across the chargeable element, and a temperature-dependent resistor, e.g., a positive temperature coefficient device, coupled in series between the charger and the chargeable element. The temperature dependent resistor is thermally and electrically coupled to the shunt regulator, wherein the first variable resistor limits current flowing through the shunt regulator if the current reaches a predetermined level less than that which would cause failure of the regulator, due to ohmic heating of the regulator.