A Novel Co-operational Control Method for LED Driver with Parallel-connected Flyback Converter

Abstract

This paper proposes a novel co-operational control method of LED driver, consisting of voltage and current sourced flyback converters. In the proposed method, both the flyback converters are controlled by the LED reference current to obtain wide range variable light control from 10 % to 100 %. Digital computer simulation is implemented to confirm the validity of the proposed method and demonstrate that the minimum on time of the MOSFET is longer than 1 μs even under the operation of 10 % of the LED rated current.