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:
Sep. 03, 2013
Filed:
Apr. 10, 2009
Masakazu Muneshima, Tokyo, JP;
Kazunobu Oi, Tokyo, JP;
Issei Hirayama, Tokyo, JP;
Meidensha Corporation, Tokyo, JP;
Abstract
A control unit of a system stabilization device uses a fluctuation detection block () to determine fluctuation components included in the active component and reactive component currents of a system current and fluctuation components included in the frequency signal and the amplitude signal of a system voltage. The high frequency cut-off of the fluctuation detection block () is set to be f; the low frequency cut-off is set to be f. The fluctuation detection block () is composed of a low-pass filter () with a time constant of T, a low-pass filter () with a time constant of T, a subtracter () which outputs the difference, between the output signals of the filter () and the filter (), and a feedback circuit () which provides feedback on the output of the subtracter () to the filters (). Thus, stability is ensured without using a current detector.