Minimizing Input Current Ripple for Four-Phase Input-Parallel Output-Series DC–DC Converter With Phase-Shift Modulation

This letter proposes a pulsewidth modulation (PWM) scheme based on phase-shift modulation for the four-phase input-parallel output-series (4P-IPOS) converter. And operation with dual-output configuration is investigated. The natural output voltages and inductor currents balancing can be achieved even without any extra components or dedicated control. In addition, compared with the conventional PWM scheme, performance improves. The input current ripple is reduced significantly at high voltage gain. An 800-W prototype of the 4P-IPOS converter was built and tested to verify the performance of the suggested scheme.