A ZVS single-inductor multi-input multi-output DC-DC converter with the step up/down capability

A multiple input-output dc-dc topology with soft switching operation and step up/down ability is introduced in this paper. The number of the converter´s inputs and outputs are completely arbitrary while they can be at different voltage and power levels. The proposed topology is composed of a small ac inductor-capacitor pair as the high-frequency link and only one reverse-blocking switch for each input or output of the converter. In order to transfer power, the link inductor charges through the inputs one-by-one and then discharges to the outputs in a proper sequence. The link capacitor creates partial resonances to achieve the zero-voltage switching at both turn-on and turn-off of all the power switches. A small-sized high-frequency transformer can be employed in the converter´s link for galvanic isolation. The principle of operation of the proposed topology is described, and a detailed analysis of the converter is carried out. Experimental results are provided to validate the performance of the proposed multi-input multi-output dc-dc converter.