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:
Aug. 14, 2012
Filed:
Jul. 13, 2009
Ikuo Fukami, Kanagawa, JP;
Ikuo Fukami, Kanagawa, JP;
Renesas Electronics Corporation, Kanagawa, JP;
Abstract
A semiconductor switch control device includes a current detecting unit that detects a current that flows in a semiconductor switch, a voltage detecting unit that detects a voltage, and a temperature detecting unit that detects a temperature. A transient thermal resistance value providing unit provides a transient thermal resistance value Zin accordance with an elapsed time from reception of an excess voltage signal to a computing unit. A temperature detecting unit detects an initial temperature Twhen an excess voltage is produced. The computing unit calculates a temperature of the semiconductor switch by a following expression when a detected current value is represented by I, and a detected voltage value is represented by V: (expression): temperature of the semiconductor switch T=I×V×Z+T.