Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/15570
Title: Elimination of electrolytic capacitor in LED power supplies by two-phase driving approach
Authors: Wong, CS
Lai, YM
Loo, KH 
Tse, CK 
Keywords: Interleaved converters
Lighting
Multiphase drive
Power factor correction
Issue Date: 2014
Publisher: Institute of Electrical and Electronics Engineers Inc.
Source: 2014 16th European Conference on Power Electronics and Applications, EPE-ECCE Europe 2014, 2014, 6910829 How to cite?
Journal: 2014 16th European Conference on Power Electronics and Applications, EPE-ECCE Europe 2014 
Abstract: A two-phase driving approach for light-emitting-diode (LED) applications is proposed in this paper. In the approach, two rectangular AC sources are employed so that the output current ripple can be significantly reduced. It leads to the elimination of electrolytic capacitor from the driver circuit. The approach is realised by a dual asymmetrical half-bridge converter with LEDs as the load. Considering the mandatory lighting standard for an AC/DC LED driver, the half-bridges are preceded by a valley-fill circuit for meeting the input power factor (PF) and current harmonic distortion requirements. Unlike other existing interleaved LED drivers that can only obtain low current ripples in certain operating points, the proposed approach can maintain a constant output current at all times even under large duty cycle dynamics due to the use of a valley-fill circuit. To validate the feasibility of the proposed approach, a 13 W prototype is built and tested experimentally.
Description: 2014 16th European Conference on Power Electronics and Applications, EPE-ECCE Europe 2014, Finland, 26-28 August 2014
URI: http://hdl.handle.net/10397/15570
ISBN: 9.78E+12
DOI: 10.1109/EPE.2014.6910829
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