High efficiency single-stage electrolytic-capacitor-less flicker-free boost LED driver

Abstract

To solve the problems of short lifespan and double-line-frequency current ripple caused by LED driver, and reduce the number of energy processing times, a high-efficiency single-stage electrolytic-capacitor-less flicker-free Boost LED driver based on the traditional Boost circuit is proposed. The driver introduces a ripple cancellation circuit, which outputs an AC ripple cancellation voltage to offset the total voltage ripple and achieve a flicker-free LED driver. Ceramic capacitors are used instead of electrolytic capacitors to extend the life of the LED driver. 96% of the power of the LED driver is converted once, the ripple coefficient of the output voltage is less than 2%, and output capacitor Co1 and output capacitor Co2 are 100μF and 47μF ceramic capacitors respectively. Finally, an 80W experimental prototype was built to verify the feasibility of the scheme.