The series capacitor converter is one kind of high-gain bidirectional DC–DC converter based on interleaved and switched capacitor techniques. For the n-phase series capacitor converter, n times voltage gain when compared with the traditional boost converter under a specific duty cycle, as well as automatic current sharing among phases can be achieved. The specific duty cycle is (n − 1)/n to 1 in the boost mode and 0 to 1/n in the buck mode, which means that it is not suitable for wide input and/or wide output applications. To solve this issue, an 180° interleaved switching strategy is proposed in this paper. The proposed strategy is more suitable for converters to widen the working duty cycle range. The working principle, voltage gain and current distribution/sharing characteristics with the duty cycle ranging from 0 to 1 are analyzed and calculated in greater detail. In addition, as one of the n-phase series capacitor converters, a small signal model of a three-phase series capacitor converter is built, and a dual closed-loop controller is studied and designed. Finally, an experimental prototype with an input voltage that varies from 10 to 30 V and an output voltage of 100 V is built and tested. Results obtained with the prototype verify the correctness of the proposed switching strategy.

串联电容器转换器是一种基于交错和开关电容器技术的高增益双向DC-DC转换器。对于n相串联电容器转换器，在特定的占空比下，与传统的升压转换器相比，可以获得n倍的电压增益，并且在各相之间实现自动均流。在升压模式下，特定占空比为（n  − 1）/ n至1，而0至1 / n在降压模式下，这意味着它不适用于宽输入和/或宽输出应用。为了解决这个问题，本文提出了一种180°交错切换策略。所提出的策略更适合于转换器以扩大工作占空比范围。分析并计算了占空比从0到1的工作原理，电压增益和电流分配/共享特性。另外，作为n的其中之一三相串联电容器变换器，建立了三相串联电容器变换器的小信号模型，研究设计了双闭环控制器。最后，构建并测试了一个输入电压范围为10至30 V，输出电压为100 V的实验原型。通过原型获得的结果证明了所提议的切换策略的正确性。