Multi-input high-reliability capacitor current consistent Sepic DC-DC converter

The invention discloses a multi-input high-reliability capacitive current consistent Sepic DC-DC converter. The converter comprises n + 1 direct current input sources, a basic Sepic converter and n gain expansion units; each gain expansion unit is composed of two inductors, two capacitors, a power switch and a diode, and the input and output gains of the converter and the voltage stress of a switching device can be adjusted by adjusting the number of the gain expansion units. The converter has the advantages of being simple in control and drive circuit, wide in input and output voltage adjusting range and high in reliability, and when one switching tube is damaged, other circuits can work normally; the converter is suitable for application occasions where the change range of output input voltage and output voltage is large, multiple power supplies are needed to supply power at the same time and the reliability requirement is high. 一种多输入高可靠性电容电流一致型SepicDC-DC变换器，该变换器包含n+1个直流输入源，一个基本Sepic变换器，n个增益扩展单元。增益扩展单元均由两个电