High-precision constant current controller for primary-side feedback LED drivers
Authors:
- 1 May 2013
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- No. 21635137,p. 1-5
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
This publication has 3 references indexed in Scilit:
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- Elimination of an Electrolytic Capacitor in AC/DC Light-Emitting Diode (LED) Driver With High Input Power Factor and Constant Output CurrentIEEE Transactions on Power Electronics, 2012
- Off-line constant current LEDs driver using the HVLED primary controller2010