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:
May. 27, 1997
Filed:
Nov. 21, 1994
Applicant:
Inventors:
Takumi Kimura, Tokyo, JP;
Katsunori Akaba, Tokyo, JP;
Fumihiko Hiratsuka, Tokyo, JP;
Takaaki Sato, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02H / ;
U.S. Cl.
CPC ...
363 50 ; 307 86 ; 363 37 ;
Abstract
A failure-free power source device memorizes the history of errors of a commercially available power source, monitors the stability of the power source on the basis of the history, directly outputs, when the power source remains stable for more than a predetermined period of time, an AC input as an AC output, and releases, when an error occurs in the power source, energy stored in an accumulator until a predetermined period of time expires to thereby output it as an AC output via an inverter.