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. 08, 2011
Filed:
Feb. 29, 2008
Satoshi Ibori, Yachimata, JP;
Tomoya Kamezawa, Narashino, JP;
Jiangming Mao, Narashino, JP;
Masayuki Hirota, Narashino, JP;
Masahiro Hiraga, Yotsukaidou, JP;
Satoshi Ibori, Yachimata, JP;
Tomoya Kamezawa, Narashino, JP;
Jiangming Mao, Narashino, JP;
Masayuki Hirota, Narashino, JP;
Masahiro Hiraga, Yotsukaidou, JP;
Hitachi Industrial Equipment Systems Co., Ltd., Tokyo, JP;
Abstract
For applications in a facility where a power conversion apparatus is frequently started and stopped, a power conversion apparatus and a power cycle longevity estimation method are provided which improve an ease of use of the facility. The power conversion apparatus comprises power conversion circuits to supply ac power of variable voltage and variable frequency, a detection circuit to detect a temperature of the power semiconductor in the power conversion circuits, and a computation device to calculate a power cycle longevity of the power semiconductor based on a maximum temperature rise detected by the detection circuit.