宽增益范围有源整流式隔离升降压变换方法及关键技术

宽电压范围隔离功率变换在航天器、电动汽车、可再生能源等电源系统中具有广泛的应用需求。拟提出并研究基于有源升压整流单元的宽电压增益范围隔离升降压变换器，以解决传统降压型或升压型隔离变换器在宽增益范围场合应用时存在的应力高、损耗大、难以实现全范围高效变换等问题。①研究如何将各类非隔离升压电路与高频二极管整流电路集成，形成具有内在升压能力的有源升压整流单元，并以此构造宽电压/负载范围软开关且单级变换的隔离升降压变换器；②提出有源升压整流单元串并联优化生成组合单元的方法及相应的变换器拓扑，以扩展增益范围、降低应力并提高效率，适应较大功率应用；③研究以软开关、高效率为目标的控制策略和参数优化设计准则等关键技术，发明并实现高性能宽增益范围隔离升降压变换器拓扑族。研究结果将形成一类宽增益范围高效隔离变换的系统理论、拓扑优化方法和应用关键技术，为航天供电等先进功率变换系统提供可选解决方案和关键技术支撑。

Wide voltage range isolated power conversion is widely desired in aerocraft, electric vehicle and renewable power systems. The conventional step-down and step-up isolated power converters suffer from high voltage stesses and power losses, and cann’t achieve high conversion efficiency in the whole voltage range. This work will study the wide-range voltage gain isolated step-up/step-down DC-DC converters based on the active-boost-rectifier (ABR) proposed to achieve high efficiency power conversion in a wide voltage/load range. ① Study how to integrate the non-isolated step-up circuits into the high frequency diode-rectifiers to build novel ABRs with intrinsic voltage step-up capability. Then construct wide voltage/load range soft-switching and single-stage power conversion high-efficiency isolated step-up/step-down DC-DC converters. ② To extend the range of voltage gain, decrease the stresses on devices and increase conversion efficiency, research on the method for series-parallel combination and optimization of multiple ABRs and build novel wide-range voltage gain isolated step-up/step-down DC-DC converters for high power applications. ③ Aiming to improve conversion efficiency and achieve soft-switching, research on the optimized modulation strategies and parameters design method for the proposed ABR-based isolated DC-DC converters. Invent and implement a family of high performance ABR-based wide-range voltage gain isolated step-up/step-down DC-DC converters. This work will come to a systematical theory and technology for ABR-based wide-range voltage gain isolated DC-DC converters with high efficiency power conversion, and also providing theory and techonology supports for the advanced aerospace power systems and other related power systems.