Single input, dual output high step‐up/down DC–DC converter with ripple‐free input current in the high current port and expandable number of output ports

In this study, a non‐isolated three‐port high step‐up/step‐down DC–DC converter is proposed. The proposed converter has the capability of cancelling the input current ripple in the high current port, moreover, the voltage conversion ratios between the high voltage and low voltage are increased by coupled inductors. All the ports of the proposed converter have a common ground. In addition, any of the three ports can be used as an input voltage source, which can supply the other two ports. The number of DC voltage ports of the proposed converter can be more increased by using more inductor‐switch cells. In this study, the theoretical results of the proposed converter are obtained and the voltage conversion ratios of the output ports, the voltage and current stress on switches, average currents of inductors, and the required condition of cancelling input current ripple at the low voltage side are calculated for the proposed three‐port converter. The voltage gains of the developed converter with four ports are also calculated. Finally, the theoretical results are reconfirmed by the experimental results for 28 V input/150 and 460 V output ports.