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:
Jul. 27, 2010
Filed:
May. 02, 2007
Yung-tse Cheng, Hsin-Chu, TW;
Chih-wei Wang, Hsin-Chu, TW;
Hung-min Shih, Hsin-Chu, TW;
Tsung-shiun Lee, Hsin-Chu, TW;
Yung-tse Cheng, Hsin-Chu, TW;
Chih-wei Wang, Hsin-Chu, TW;
Hung-min Shih, Hsin-Chu, TW;
Tsung-shiun Lee, Hsin-Chu, TW;
AU Optronics Corp., Hsin-Chu, TW;
Abstract
A light module includes a plurality of light sources for generating light, a power controller, a bridge converter, a first piezoelectric transformer, a second piezoelectric transformer, a resonance balance circuit, and a protection circuit. The power controller is used for generating a power driving signal based on a control signal. The bridge converter is used for generating a supply voltage signal based on the power driving signal. The first piezoelectric transformer is used for transforming the supply voltage signal into a first driving voltage signal to a first end of each of the plurality of lamps. The second piezoelectric transformer is used for transforming the supply voltage signal into a second driving voltage signal to a second end of each of the plurality of lamps. The resonance balance circuit includes a primary winding coupled to the first and the second piezoelectric transformers, and a secondary winding for outputting a feedback signal in response to a current flowing through the primary winding. The protection circuit is coupled to the secondary winding of the resonance balance circuit, and is used for generating the control signal based on the feedback signal.