Title :
High-precision constant current controller for primary-side feedback LED drivers
Author :
Wang, Yulin ; Jiang, Junmin ; He, Lenian
Author_Institution :
Institute of VLSI Design, Zhejiang University, Hangzhou 310027, China
Abstract :
This paper presents a novel constant current LED controller with primary-side feedback control method for flyback topology. The method is proposed based on sampling input peak current and secondary-side electric information detected by an extra auxiliary winding. Eliminating opto-isolator, the controller can still regulated the output current precisely by designing special sample circuit and compensating signal propagation delay. A prototype with 7 LEDs has been built to verify the control method. The experiment´s results meet the design requirements of 3% current regulation in a wide range of input ac voltage from 85 V to 265 V.
Keywords :
Current control; Inductance; Light emitting diodes; Propagation delay; Pulse width modulation; Switches; Voltage control; Constant current; Flyback; High precision; Primary-side feedback;
Conference_Titel :
Industrial Electronics (ISIE), 2013 IEEE International Symposium on
Conference_Location :
Taipei, Taiwan
Print_ISBN :
978-1-4673-5194-2
DOI :
10.1109/ISIE.2013.6563609
