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. 27, 2013
Filed:
Jun. 05, 2009
Hiroyuki Watanabe, Tokyo, JP;
Hiromichi Itoh, Tokyo, JP;
Yoshitaka Sakai, Tokyo, JP;
Meidensha Corporation, Tokyo, JP;
Abstract
In an instantaneous voltage drop compensating device, when an instantaneous drop occurs, an electric power transformer () performs an inverter action so that the electric power of a side-by-side placed capacitor () is DC/AC-converted and fed to a load (). At this time, a capacitor's remaining lifetime diagnosing unit () introduces the DC voltage value, the DC current value, and the temperature value of the side-by-side placed capacitor () thereinto, and uses a prestored program for computing a remaining lifetime, thereby diagnosing the remaining lifetime, for which the side-by-side placed capacitor () can be used under the state where a capacitor discharge time period exceeds a rated compensation time period. As a result, the remaining lifetime, for which the side-by-side placed capacitor () can be used, can be diagnosed under the situations where the discharge time period for the side-by-side placed capacitor () to discharge while outputting the rated electric power exceeds the rated compensation time period required as the time period for which an electric power compensating device has to output the rated electric power.