Reduced Ripple Current Three phase Parallel Loaded Resonant Converter for LED Lighting

Abstract

In this paper, a three phase full-bridge parallel loaded LC resonance converter based DC-DC LED driver is proposed for LED lighting applications. This converter reduces the ripple content to a very low value such that filter capacitor can be eliminated. This increases the lifespan of the LED driver. The filter inductor used is very small as the ripple content is reduced and ripple frequency is increased. ZVS is achieved in the proposed converter using parallel loaded LC resonance by which switching losses are minimized and efficiency of the converter is increased. Dimming is also employed in the proposed converter. LED current is controlled by varying switching frequency of the converter for supply voltage variations. The detailed description, circuit analysis and simulation results of the proposed converter are presented.