An Optimization Control Method for Instantaneous Current Suppression of Dual Buck LED Driver

In this paper, a dual-Buck circuit is adopted as LED driver, which has simple structure with high utilization rate of the switch. At the same time, the switching frequency is increased to reduce the volume of the converter. An optimized control method with gradually increased duty cycle is proposed to solve the problem of the large peak current, ensuring the output power of the system while suppressing the current stress. Besides, an optimized planar magnetic component design method is adopted to reduce magnetic component losses effectively by using the variable width winding. The topology principle and the optimization process are analyzed in detail. Finally, combined with gallium nitride devices, a prototype with 1MHz switching frequency, 60W output power, and 94.1% full load efficiency is built to verify the accuracy of theoretical analysis.