A Method for Reducing Voltage Spikes and Circulating Current of Current-Fed Push-Pull DC/DC Converter

The advantages of the current-fed push-pull DC/DC converter are fewer devices used, a simple structure, and low loss. However, the development and application of the converter are limited due to the problems of the voltage spike of the switches and the large circulating current. To solve these problems, a control method based on naturally clamped zero-current commutated is proposed in this paper. In the proposed method, the power is transmitted by adjusting the duty cycle of the primary side switches, the phase-shift in the secondary side bridges, and the phase-shift between them. Firstly, the operation principle of the converter is analyzed in detail. Secondly, the circulating current at the secondary side is optimized. Finally, the analysis results are verified by simulation.