Five-phase isolated DC-DC converters with bidirectional are suggested in this paper. In these converters, a three-level converter or a three-leg-controlled rectifier is coupled to a multi-level modified converter via a high frequency transformer. Better voltage and current waveforms can be obtained on the transformer's primary and secondary sides by employing a 5-level converter, which will boost efficiency. This work proposes a novel isolated soft-switching high step-up DC-DC converter. These DC-DC converters are connected cascaded at their output terminals to form the suggested inverter. When each DC-DC converter's output voltage is controlled, this inverter can function with high voltage gain. Additionally, it requires fewer DC-DC blocks to produce a greater range of output voltage levels. The suggested inverter is appropriate for photovoltaic power conditioning systems because of all these benefits.