Two-stage Interleaving DC/DC Topology Based on Phase-shift Full bridge Converter

Two-stage DC/DC converter usually adopts the structure of phase-shift full bridge and buck circuit. This paper introduces the topology and principle of two-stage DC/DC converter. The pre-stage phase-shift full bridge circuit realizes soft switch by phase-shift control, so it reduces switch loss. The buck circuit can realize closed loop control to output a fixed voltage. It's suggested that the output current ripple could be gotten a well inhibition when the interleaving parallel technology is applied, so it increases output power. The hardware and software of the system are designed by TMS28335. Finally, a 5kW-converter is designed whose maximum input voltage is 700V and output voltage is 250V-550V, then the experimental results are given.

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