A Single-stage LED Driver based on Resonant Converter with Low-voltage Stress

This paper presents a novel integrated-stage LED driver based on Flyback and resonant converters. The Flyback converter realizes power factor correction in the discontinuous conduction mode. The resonant converter is operated as a DC-DC converter to support the LED loads. Moreover, the resonant converter can clearly decrease the drain-source voltage of the active switch and exhibits zero-voltage-switch characteristics. Therefore, a cost-effective MOSFET can be chosen as the main control component that can decrease the cost of the whole system. Compared to a single active switch converter (such as Class-E converter), the number of passive components in the resonant converter can be limited to four. Therefore, the power density of the system can be improved drastically. In this paper, a 100 W prototype is presented under the experimental condition to validate the proposed integrated-stage LED driver.