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:
Nov. 27, 2007
Filed:
Jul. 11, 2005
Chin-chang Wu, Kaohsiung, TW;
Hung-liang Chou, Kaohsiung, TW;
Ya-tsung Feng, Kaohsiung, TW;
Wen-pin Hsu, Kaohsiung, TW;
Yao-jen Chang, Kaohsiung, TW;
Chin-Chang Wu, Kaohsiung, TW;
Hung-Liang Chou, Kaohsiung, TW;
Ya-Tsung Feng, Kaohsiung, TW;
Wen-Pin Hsu, Kaohsiung, TW;
Yao-Jen Chang, Kaohsiung, TW;
UIS Abler Electronics Co., ltd., Taipei Hsien, TW;
Abstract
An active type harmonic suppression apparatus, connected in parallel to a power feeder, supplies a compensation current for injecting into the power feeder such that a utility current of a power source is approached to a sinusoidal wave. The control circuit retrieves a load current, a utility current, an output current of the power converter, a power source voltage and a voltage of the dc power capacitor for calculating and sending a reference signal of compensation voltage to a pulse-width-modulation circuit which generates switching signals for the power converter. Furthermore, the harmonic suppression apparatus can provide a fixed or variable reactive power.