Soft switched LED driver for multiple lighting system with independent control

Abstract

In this paper, a half-bridge series resonant converter based LED driver is proposed. ADC method is employed for regulating LED current. Here two LED loads are driven using two half-bridge converters. ZVS is achieved in the proposed converter using series LC resonance. Therefore switching losses are reduced which increases the converter efficiency. Ripple current is reduced using filter inductor thereby eliminating electrolytic capacitor. Thus lifespan of LED driver increases. Dimming is achieved in the proposed converter. Proposed converter also regulates LED current against input voltage variations. The detailed description, circuit analysis and simulation results of the proposed converter are presented.