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:
Apr. 05, 2005
Filed:
Nov. 28, 2003
Yung-chun Wu, Kaohsiung, TW;
Yu-kai Chen, Taipei, TW;
Tsai-fu Wu, Chiai, TW;
Chin-hsiung Chang, Taichung, TW;
Yung-Chun Wu, Kaohsiung, TW;
Yu-Kai Chen, Taipei, TW;
Tsai-Fu Wu, Chiai, TW;
Chin-Hsiung Chang, Taichung, TW;
Fego Precision Industrial CO, Ltd., Taichung, TW;
Abstract
An electronic ballast system with emergency lighting features is presented. Especially, the electronic ballast system is relative to a single-stage converter configuration. The electronic ballast system serves as a regular ballast, a regular/emergency ballast, a battery charger or discharger and a power failure detector, fulfilling emergency lighting features. The single-stage converter used in the ballast is an integration of a bi-directional flyback converter and two half-bridge series-resonant parallel-loaded inverters. Unlike conventional approaches, the rectified and filtered input voltage is directly added to a set of battery voltages in the proposed system, so as to reduce the fabrication cost by simplifying the circuit configuration and the number of active switching elements.