基于矩阵变压器的1 MHz GaN LLC谐振变换器

现代工业生产越来越重视节约能源和降低成本,促使高效率和高功率密度成为分布式电源系统发展的主要方向。随着信息技术、计算机系统和电动汽车等领域的发展,对具有高效率、高功率密度的隔离电源的需求显著增加。本文针对数据中心服务器电源对高效率、高功率密度的需求,通过提升开关频率到1 MHz来提高变换器的功率密度;并对传统LLC变换器进行研究,阐述其工作原理及相对其他变换器的优势。在此基础上,应用GaN器件、矩阵变压器和同步整流来进一步优化传统LLC谐振变换器;最后设计并制作了一台1kW,380V输入、12V输出实验样机,功率密度达到300W/in3,验证了理论分析的正确性。

1 MHz GaN LLC Resonant Converter with Matrix Transformer

Energy saving and cost reduction are becoming more and more important for today''s industry, causing efficiency and power density to become major driving forces in modern power delivery systems. With the development of information technology, computing systems, electric vehicles and other fields, the demand for isolated power supplies with high efficiency and high power density grows significantly. In order to meet the requirements of high efficiency, high power density for data center server power supplies, the switching frequency is increased to 1 MHz. The investigation of traditional LLC converters is carried out to explain the operation principle, as well as the advantages compared with other converters. The GaN MOSFETs, matrix transformer and synchronous rectifier are applied to further optimize the traditional LLC resonant converter. Finally, a 1 kW, 380 V input, 12 V output experimental prototype with power-density of 300 W/in³ is built to verify the theoretical analysis.