Design and Optimization of a 380V-12V High-Frequency, High-Current LLC Converter with GaN Devices and Planar Matrix Transformers

作者：Mingkai Mu, Fred C. Lee · 发表于：IEEE Journal of Emerging and Selected Topics in Power Electronics · 年份：2016 · DOI：10.1109/jestpe.2016.2586964 · 被引用次数：193 · 研究领域：Advanced DC-DC Converters、Silicon Carbide Semiconductor Technologies、GaN-based semiconductor devices and materials

Data centers demand high-current, high-efficiency, and low-cost power solutions. The high-voltage dc distribution power architecture has been drawing attention due to its lower conduction loss on cables and harnesses. In this structure, the 380-12 V high output current isolated converter is the key stage. This paper presents a 1-MHz 1-kW LLC resonant converter using GaN devices and planar matrix transformers that are designed and optimized for this application. The transformer design and the optimization of the output capacitor termination are performed and verified. Finally, this cost-effective converter achieves above 97% peak efficiency and 700-W/in3power density.