This paper generically classifies and unifies basic single-switch, single-inductor, dc-to-dc converters. The boost and buck/boost flyback converters are shown to be supplementary, each being part of the same three-port terminal transfer function. Realizing one of these converters inherently results in the other as a fully functional composite output port. Three-port examination of the forward converter reveals it too combines two different converter voltage/current transfer functions. Generalized three-port analysis is used to specify the requirements of a realizable universal dc-to-dc converter theoretically capable of producing isolated output dc and ac voltage and current in the range±∞.
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B.W. Williams (2008) studied this question.