A Single-Stage Dimmable Multi-String HB-LED Driver with High Power Factor and Temperature Compensation
作者： Y.H Chiu , Y.H Liu , Y.L. Chen , S.C Wang
DOI: 10.2991/CISIA-15.2015.263
关键词:
摘要: This paper proposes a single-stage constant-current driver with power factor correction (PFC) and temperature rise compensation for igniting multi-string high-brightness light-emitting diodes (HB-LEDs) in parallel connection. The devised dimmable LED is composed of coupled inductor single-ended primary inductance converter (SEPIC) PFC mechanism k-channel current regulators (CRs) dimming capabilities. voltage drop features negative coefficient characteristic subject to change depending on the forward thermal resistivity given package. By regulating feeding continuously, dynamic regulation (DVR) control addressed this automatically minimize dissipation CR caused by variation due junction drift. With low implemented outlay, studied topology has good conversion efficiency total harmonic distortion (THD). mechanisms design considerations are analyzed discussed. An 80W laboratory prototype two low-cost commercial controllers also built tested. Experimental results provided show effectiveness performance proposed scheme. KeywordsPFC; HB-LEDs; SEPIC; DVR
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