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Feasibility study of cascading of full soft-switching current-fed naturally clamped DC-DC converters

In this paper, a novel input-series output-parallel (ISOP) power electronics system is studied. It is made up of cells based on full soft-switching current-fed naturally clamped DC-DC converter topology. This system could be advantageous for power supply of high voltage remote systems with DC voltage, since parasitic inductance of the wire can be utilized as an energy storage. Three different approaches for ISOP cascading are proposed and compared in terms of input current ripple, effective operating frequency, voltage and current stress and operation performance under fault conditions in one of the cells. ISOP system proposed can be advantageous in specific applications, like subsea mining or intelligent transformer for remote areas due to inherent reliability obtained with (N+1) redundancy.