基于GaN器件LLC谐振变换器的平面变压器优化设计

Optimization Design of Planar Transformer in GaN-based LLC Resonant Converter

现代开关电源的发展呈现高效率和高功率密度的趋势。基于GaN器件LLC谐振变换器,采用同步整流技术,通过平面变压器的设计和结构优化大大减小了变换器的高度和体积,同时也减少损耗,提高了系统的功率密度和效率。搭建了1 MHz/120 W同步整流LLC谐振变换器硬件电路,对设计进行了实验验证。样机的功率密度达到了262 W/in^3,最高效率达到了94.9%。

High efficiency and high power density is the development trend in modern switching power supply. In this paper, an enhancement-mode Gallium Nitride（e GaN） is designed based LLC resonant converter with synchronous rectifica-tionts decreased the height, volume and loss of converter through the design and structural optimization of planar transformer, which improved the power density and efficiency of the system. A LLC resonant converter of 1 MHz with synchronous rectification prototype rated at 120 W is built to verify the design. The power density of the design is262 W/in3 and the highest efficiency ofthe prototype achieves 94.9%.