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:
Nov. 17, 2015
Filed:
Jan. 15, 2013
Applicant:
Littelfuse, Inc., Chicago, IL (US);
Inventors:
Assignee:
LITTELFUSE, INC., Chicago, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02H 5/00 (2006.01); H02H 5/04 (2006.01); H01C 7/02 (2006.01); H01H 85/041 (2006.01); H01H 85/046 (2006.01); H01H 85/048 (2006.01); H03K 17/687 (2006.01); H03K 17/72 (2006.01); H03K 17/74 (2006.01);
U.S. Cl.
CPC ...
H02H 5/048 (2013.01); H01C 7/02 (2013.01); H01H 85/046 (2013.01); H01H 85/048 (2013.01); H01H 85/0418 (2013.01); H01H 2085/0414 (2013.01); H01H 2085/0483 (2013.01); H03K 17/687 (2013.01); H03K 17/72 (2013.01); H03K 17/74 (2013.01);
Abstract
A circuit protection device includes a fuse element placed in parallel with a PTC thermistor layer. The element and PTC thermistor layer are provided on one or more insulating substrate, such as an FR-4 or polyimide substrate. First and second conductors connect the fuse element and PTC thermistor layer electrically in parallel, such that current (i) initially under normal flows mainly through the fuse element and PTC thermistor layer at a lower drop in voltage and (ii) after an opening of the fuse element flows under normal operation through the PTC thermistor layer at a higher drop in voltage.