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:
May. 01, 2012
Filed:
Aug. 21, 2009
Che-min Lin, Taoyuan County, TW;
Yi-chun Yeh, Taoyuan County, TW;
Che-Min Lin, Taoyuan County, TW;
Yi-Chun Yeh, Taoyuan County, TW;
FSP Technology Inc., Taoyuan, Taoyuan County, TW;
Abstract
A passive current balance driving apparatus including first and second drivers is provided. The first driver includes a first balance-capacitor having a first terminal coupled to a first terminal of an AC signal source and a second terminal providing a first balance AC-voltage; and a first rectification unit rectifying the first balance AC-voltage to output a first DC-voltage to drive a first LED string with multi-LEDs connected in series. The second driver includes a second balance-capacitor having a first terminal coupled to a first terminal of the AC signal source and a second terminal providing a second balance AC-voltage; and a second rectification unit rectifying the second balance AC-voltage to output a second DC-voltage to drive a second LED string with multi-LEDs connected in series. The capacitive reactances of these two balance-capacitors are the same and respectively greater than the total internal resistances of the first and second LED strings.