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:
Oct. 27, 2009
Filed:
Mar. 10, 2005
Applicants:
Takaaki Karikomi, Sagamihara, JP;
Ken Ito, Machida, JP;
Inventors:
Takaaki Karikomi, Sagamihara, JP;
Ken Ito, Machida, JP;
Assignee:
Nissan Motor Co., Ltd., Yokohama-shi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02H 3/00 (2006.01); G01K 7/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
Heating value P[W] generated at an IGBT is calculated, and a temperature difference ΔT'[° C.] between a temperature T[° C.] of cooling water circulating in a cooling system and a temperature T[° C.] of an IGBT is calculated based on thermal resistance R [° C./W] of the cooling system. A temperature rise ΔT[° C.] with transient influences eliminated is then calculated based on the calculated temperature difference ΔT′[° C.], and the temperature T[° C.] (=T[° C.]+ΔT[° C.]) of the IGBT is calculated.