Resonant Push-pull Converter with Flyback Regulator for MHz High Step-Up Power Conversion

Chang Wang, Mingxiao Li, Ziwei Ouyang, Gang Wang
2020 IEEE transactions on industrial electronics (1982. Print)  
With the trend towards achieving high efficiency, high power density and high operating frequency in power converters, a galvanic isolated circuit architecture is proposed in this paper for high step-up applications with wide input-voltage range. This converter consists of a current-fed resonant push-pull converter (PP) as a DC transformer (DCX) dealing with most of power with high efficiency and an active clamp flyback converter (ACF) as a regulator within a large conversion range. As a
more » ... range. As a single-stage converter, the ACF regulator is paralleled with PP converter to share the total power and regulates the high output voltage. An experimental prototype with an input voltage range of 24 V-32 V and output 400 V/400 W is built under 1 MHz switching frequency. A peak efficiency of 97.1% and a power density of 210 W/in 3 (or 13 W/cm 3 ) are achieved. Experimental result validates the correctness of the analysis and proves the feasibility of the proposed converter for MHz high step-up DC-DC conversion. Index Terms-Current-fed resonant push-pull, active clamp flyback, high step-up dc-dc converter, wide inputvoltage range, MHz, high efficiency, high power density. I.
doi:10.1109/tie.2020.2969109 fatcat:k6mcwoqpujfjpkdfqlqztel5ba