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:
Dec. 13, 2011
Filed:
Aug. 19, 2008
Chin-chang Wu, Kaohsiung, TW;
Hung-liang Chou, Kaohsiung, TW;
Yu-hsiu Lin, Kaohsiung, TW;
Wen-jie Hou, Kaohsiung, TW;
Han-sheng Wei, Kaohsiung, TW;
Chin-Chang Wu, Kaohsiung, TW;
Hung-Liang Chou, Kaohsiung, TW;
Yu-Hsiu Lin, Kaohsiung, TW;
Wen-Jie Hou, Kaohsiung, TW;
Han-Sheng Wei, Kaohsiung, TW;
Ablerex Electronics Co., Ltd., Taipei Hsien, TW;
Abstract
A UPS system includes one or more UPS units with identical or different capacities. A control circuit, used to control a DC/AC inverter of the UPS unit, includes a voltage feedback control circuit and a current feedforward control circuit. The voltage feedback control circuit is used to control the amplitude and the waveform of load voltage. The current feedforward control circuit is used to operate the DC/AC inverter of the UPS unit as a virtual fundamental resistor and a virtual harmonic resistor which are serially connected to an output terminal of the DC/AC inverter such that each UPS unit can be distributed to provide an output current according to the capacity ratio of the UPS system.