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. 18, 2008
Filed:
Jun. 29, 2004
Ya-tsung Feng, Kaohsiung, TW;
Chin-chang Wu, Kaohsiung, TW;
Hung-liang Chou, Kaohsiung, TW;
Nan-ying Shen, Kaohsiung, TW;
Kuo-fang Huang, Kaohsiung, TW;
Yao-jen Chang, Kaohsiung, TW;
Ya-Tsung Feng, Kaohsiung, TW;
Chin-Chang Wu, Kaohsiung, TW;
Hung-Liang Chou, Kaohsiung, TW;
Nan-Ying Shen, Kaohsiung, TW;
Kuo-Fang Huang, Kaohsiung, TW;
Yao-Jen Chang, Kaohsiung, TW;
UIS Abler Electronics Co., Ltd., Hsintien, Taipei Hsien, TW;
Abstract
A backup power supply system supplies power from a first ac power source in normal condition. Once the first ac power source is abnormal or fails, the system automatically turns off the first ac power source and turns on a second ac power source with null transfer time. When the first ac power source is normal, a dc/ac power inverter is controlled to supply an approximately null current such that a mechanical switch is allowed to be closed and no circulating current is generated between the first ac power source and the dc/ac power inverter. Since the mechanical switch is continuously closed, and requires no switching operation, the backup power supply system can supply the backup power with a null transfer time.