基于Sepic-Cuk的零纹波双极性输出直流变换器OA

With increasing integration of renewable energy sources like photovoltaics and fuel cells into power grids,bipolar DC microgrids have shown significant advantages.To overcome limitations such as high input current ripple and low voltage gain in conventional converters,a zero-ripple bipolar DC-DC converter based on a Sepic-Cuk structure is proposed.The converter combines Sepic and Cuk topologies using shared inductors and switches,achieving symmetrical bipolar output by utilizing their complementary voltage gain characteristics.Capacitor clamping reduces input current ripple,while coupled inductors increase voltage gain.The converter is analyzed systematically,covering operating principles,ripple suppression,and key parameter design.A prototype rated at 130 W,with a switching frequency of 100 kHz,an input voltage of 40 V,and a total output voltage of 360 V(±180 V),is built and tested.The measured output voltages show close agreement with theoretical calculations,and a conversion efficiency of 96.1％is achieved,confirming the effectiveness and feasibility of the proposed converter.