Analysis and Design of the Active Clamp Forward Converter as a Color LED Driver

Chien Hsuan Chang; Hung Liang Cheng; Chun An Cheng; En Chih Chang

doi:10.4028/www.scientific.net/AMM.284-287.2472

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 284-287Analysis and Design of the Active Clamp Forward...

Analysis and Design of the Active Clamp Forward Converter as a Color LED Driver

Abstract:

Light emitting diodes (LEDs) have substituted for incandescent bulbs and fluorescent lamps gradually in the residential, industrial and commercial lighting applications. This paper proposes an active clamp forward converter with the sequential color display (SCD) control to drive red, green and blue (RGB) LED arrays. Both of the main switch and the auxiliary switch can turn on under zero voltage switching (ZVS), resulting in high system efficiency. RGB LED arrays are sequentially driven by the same converter, which can save components and reduce cost significantly. Besides, the pulse-width modulation (PWM) control is applied to achieve a large chromaticity variation. The operation principles of the proposed LED driver are addressed. Experimental results of a 100W laboratory prototype are used to verify the feasibility and validity of the theoretical predictions.