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- W769189638 abstract "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 driver is composed of a coupled inductor single-ended primary inductance converter (SEPIC) with PFC mechanism and k-channel current regulators (CRs) with dimming and temperature compensation capabilities. The LED voltage drop features negative temperature coefficient characteristic and is subject to change depending on the forward current and the thermal resistivity of a given package. By regulating the LED feeding voltage continuously, a dynamic voltage regulation (DVR) control is addressed in this paper to automatically minimize the power dissipation of the CR caused by the voltage drop variation due to the LED junction temperature drift. With low implemented outlay, the studied topology of multi-string LED driver has good power conversion efficiency and low total harmonic distortion (THD). The control mechanisms and design considerations are analyzed and discussed. An 80W laboratory prototype implemented with two low-cost commercial controllers is also built and tested. Experimental results are provided to show the effectiveness and performance of the proposed scheme. KeywordsPFC; HB-LEDs; SEPIC; DVR" @default.
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- W769189638 date "2015-01-01" @default.
- W769189638 modified "2023-09-26" @default.
- W769189638 title "A Single-Stage Dimmable Multi-String HB-LED Driver with High Power Factor and Temperature Compensation" @default.
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- W769189638 doi "https://doi.org/10.2991/cisia-15.2015.263" @default.
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