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:
Oct. 20, 2009
Filed:
Sep. 06, 2007
Masakazu Ushijima, Tokyo, JP;
Ting-cheng Lai, Taichung, TW;
Wan-lu Lin, Taichung, TW;
Te-min Liu, Taichung, TW;
Chien-fu Ho, Taichung, TW;
Masakazu Ushijima, Tokyo, JP;
Ting-Cheng Lai, Taichung, TW;
Wan-Lu Lin, Taichung, TW;
Te-Min Liu, Taichung, TW;
Chien-Fu Ho, Taichung, TW;
Greatchip Technology Co., Ltd., Taichung, TW;
Abstract
A current balancing circuit for first and second lamp sets includes a step-up transformer and a current balancer. The step-up transformer is adapted to be coupled to a power supply for receiving an alternating-current source power, and for generating a drive signal by varying magnitude of the alternating-current source power. The step-up transformer is further adapted to be coupled to the first and second lamp sets for providing the drive signal thereto. The current balancer includes first and second shunt transformers. Each of the first and second shunt transformers includes primary and secondary windings that correspond to each other in number of turns thereof. The first and second shunt transformers are adapted to be coupled to corresponding discharge lamps of the first lamp set. The current balancer is adapted to mirror current flowing through the first and second shunt transformers to the second lamp set.