A Control Strategy for Input-Parallel Output-Parallel Phase-Shift Full-Bridge DC-DC Converter

This manuscript proposed a coordinated control method based on droop characteristic for an input-parallel output-parallel (IPOP) phase-shift full-bridge (PSFB) DC-DC converter. By introducing a variable virtual impedance and a DC bias voltage in the control loop, the output current sharing is got, the output voltage drop is compensated, and the circulating current is suppressed. The proposed control strategy is validated by means of a 3-kW experimental prototype with two IPOP PSFB DC-DC converter modules at 100 kHz. And a maximum efficiency of 95.3 % is achieved.