A conventional boost three-port converter is combined with a coupled-inductor-based boost-flyback converter in this work to produce a high-step-up three-port converter. The proposed converter inherits the benefits of two conventional converters, including high voltage gain, few elements, and energy recycling of the leakage inductor. In addition, the voltage stresses of switches are considerably lower than the output voltage. Therefore, switches with low ON resistance can be selected to reduce the conduction loss. Additionally, the freewheel diodes are capable of zero-current switching. The operation principle can be divided into three modes of operation, and the three steady-state operation modes are analyzed under each of the three conduction modes. The operation principles of various modes, the voltage characteristics, the boundary of the coupled inductor, and the proposed converter’s control method are discussed in depth to provide detailed theoretical guidance to designers. Then, the simulation and experiment results of a laboratory prototype with an 18 V PV source, 24 V battery pack, and 180 V output are presented to validate the feasibility of the theoretical analysis.

在这项工作中，将传统的升压三端口转换器与基于耦合电感的升压反激转换器相结合，以产生高升压三端口转换器。所提出的转换器继承了两个传统转换器的优点，包括高电压增益、少量元件和漏电感的能量回收。此外，开关的电压应力大大低于输出电压。因此，可以选择导通电阻低的开关来降低导通损耗。此外，续流二极管能够进行零电流开关。其工作原理可分为三种工作模式，分别在三种导通模式下分别分析三种稳态工作模式。各种模式的工作原理，电压特性，对耦合电感的边界以及所提出的转换器控制方法进行了深入讨论，为设计人员提供详细的理论指导。然后，给出了具有 18 V PV 源、24 V 电池组和 180 V 输出的实验室样机的仿真和实验结果，以验证理论分析的可行性。