超高频功率变换技术可实现电力电子变换器的小型化与轻量化，在消费电子、航空航天、军事国防等领域中具有广泛的应用前景与迫切的现实需求，但现有超高频功率变换器只能高效工作在单一负载点或极窄的负载范围内。为解决上述问题，本项目面向宽负载范围条件下的超高频功率变换系统，首先开展宽负载范围阻抗压缩网络结构及其调控方法研究，减小等效阻抗变化范围；其次开展超高频功率变换器谐振电路参数设计及其高效运行区间分析，提升压缩区间内的系统效率；最后开展超高频功率变换器磁性元件优化设计及系统优化布局研究，减小寄生参数对压缩特性及系统效率影响。本项目将为超高频电力电子变换器高效工作范围拓展提供理论指导与技术支撑，对于推动宽负载范围高效率超高频电力电子变换器发展具有重要意义。

Very High Frequency (VHF) power conversion technology can realize miniaturized and lightweight power electronic converters, which owns broad application prospects and urgent needs in consumer electronics, aerospace, military defense and other fields. However, the operating range of existing VHF power converter is very narrow, it can only operate efficiently at single load or very narrow load range. To solve above problem, this project is oriented to VHF power conversion system for wide load range. Firstly, the impedance compression network structure and control method for wide load range is researched, which can narrow the variation range of equivalent impedance; Secondly, the resonant circuit parameter design and its high-efficiency operating range analysis is researched, which can improve the efficiency within compressed impedance range; Finally, magnetic component optimized design and system optimized layout of VHF power converter is researched, which can reduce the influence of parasitic parameters on compression characteristics and system efficiency. This project will provide theoretical guidance and technical support for expanding the high-efficiency operating range of VHF power electronic converters. The research is of great significance to promote the development of wide-load-range high-efficiency VHF power electronic systems.