The voltage gain of a traditional buck converter is finite due to the high voltage across the semiconductor and reduced efficiency. A non-isolated high step-down DC–DC converter based on symmetric switched inductors is proposed in this paper. The connection of inductors in series or in parallel is controlled by switches to improve the conversion ratio. The converter has many beneficial characteristics, such as high step-down, reduced voltage stresses, and high efficiency. Moreover, it can realize voltage balance on the switches. The voltage on the switch does not oscillate and the loss of the switches is reduced. Therefore, the efficiency of the whole topology is improved. This paper discusses the operation principle, modes analysis, voltage gain analysis, voltage stress analysis, output ripple analysis, loss analysis, comparative analysis and design considerations. The correctness of the theoretical analysis of the proposed converter is verified by a laboratory prototype, and its peak efficiency reaches 96.5%.

由于半导体两端的高电压和降低的效率，传统降压转换器的电压增益是有限的。本文提出了一种基于对称开关电感的非隔离式高降压DC-DC变换器。电感串联或并联的连接由开关控制，以提高转换率。该转换器具有许多有益特性，例如高降压、降低的电压应力和高效率。此外，它可以实现开关上的电压平衡。开关上的电压不振荡，降低了开关的损耗。因此，提高了整个拓扑的效率。本文讨论了工作原理、模式分析、电压增益分析、电压应力分析、输出纹波分析、损耗分析、比较分析和设计考虑。所提出的转换器理论分析的正确性通过实验室样机验证，其峰值效率达到96.5%。