Design of A High Power Density DC-DC Converter

This paper proposes a high-efficiency, high-power density 400/48V converter and elaborates its working principle and design method. The converter uses the traditional LLC topology and combines the third-generation wide-bandgap semiconductor device GaN FETs and planar magnetic components to meet high-performance index requirements. At the same time, it combines the control chip DSP28027 to switch control methods for different load conditions to improve the efficiency curve. It adopts an adaptive pulse control method for light load conditions, and uses PI to adjust the stable output voltage for normal load conditions. Combining circuit and magnetic circuit simulation software for system simulation of the converter, the simulation results are consistent with the theoretical analysis, verifying the rationality of the converter.