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. 12, 1996
Filed:
Aug. 24, 1994
Michihiro Furuta, Kobe, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
An active filter device simple in construction and low in price in which higher harmonic components can be stably suppressed without requiring a passive filter even when a load to be compensated includes a capacitative load. Such an active filter device includes: a current transformer for detecting a load current; a frequency detection circuit for detecting higher harmonic components contained in the load current; a first three-phase/two-phase conversion circuit for determining a reference compensation current for compensating for the current with respect to a first frequency among the higher harmonic components; a first filter circuit; a first two-phase/three-phase conversion circuit; a first phase compensation circuit; an n-th three-phase/two-phase conversion circuit for determining a reference compensation current for compensating for the current with respect to an n-th frequency; an n-th filter circuit; an n-th two-phase/three-phase conversion circuit; an n-th phase compensation circuit; an adder for synthesizing the respective reference compensation currents with respect to the first frequency and the n-th frequency; an inverter circuit for outputting a resultant compensation current based on the output from the adder; and an inverter transformer.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile