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:
Sep. 08, 2009
Filed:
Oct. 23, 2007
Tsuneo Maebara, Nagoya, JP;
Ryousuke Inoshita, Aichi-ken, JP;
Kenichi Oohama, Ichinomiya, JP;
Daisuke Ishiura, Kariya, JP;
Tsuneo Maebara, Nagoya, JP;
Ryousuke Inoshita, Aichi-ken, JP;
Kenichi Oohama, Ichinomiya, JP;
Daisuke Ishiura, Kariya, JP;
DENSO Corporation, Kariya, JP;
Abstract
A circuit for detecting excessive current flow through a switching element derives an electrical quantity relating to a condition of the switching element and correlated with the current level, and compares the magnitude of that electrical condition quantity with a threshold value corresponding to the maximum allowable level of current. A temperature detection signal indicative of the switching element temperature is converted to a compensation signal having a temperature characteristic which is modified from that of the temperature detection signal, and which is utilized to compensate the magnitude comparison operation against inaccuracy caused by a temperature dependency of the electrical condition quantity.