New high step-up DC-DC converter with quasi Z-source network

[摘要] A new quasi-Z-source high step-up dc-dc converter is proposed in this letter. Compared with a conventional quasi-Z-source dc-dc converter, the proposed converter features low voltage ripple at the output, the use of a common source switch, and low stress on circuit elements. The advantages including low EMI, free of high side driver, and reduction of cost has been expected. The new topology named as a low-side-drive Quasi-Z-source boost converter (LQZC) consists of a flying capacitor (CF), the QZ, two diodes and a N-channel switch. About 1/5 reduction of the output ripple was verified by the PSIM simulation when the input voltage is 48V at a duty ratio of 0.1.

[学科分类] 电子、光学、磁材料

[关键词] high step-up DC-DC converter;quasi Z-source;output ripple;high side driver free;low voltage stress