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:
Mar. 02, 2004
Filed:
Sep. 13, 2001
Applicant:
Inventor:
Bunya Sato, Fukushima, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02H 3/08 ;
U.S. Cl.
CPC ...
H02H 3/08 ;
Abstract
An electronic device protection circuit inhibits a voltage exceeding the rated voltage of the electronic device, which may include a secondary battery, from being applied and includes a positive temperature characteristic device and a diode that are connected in series and arranged in proximity to each other. The thermal fuse, the posistor, and the zener diode are arranged to conduct heat to each other, so that applying an overvoltage greater than the rated voltage to input terminals of the electronic device causes the current resulting from the overvoltage to flow through the zener diode that causes it to generate heat that accelerates the fusion of the thermal fuse.