General law of non-isolated interleaved high step-up topologies with winding-cross-coupled inductors deduced from isolation counterparts

The relationship between the isolated transformer and the non-isolated autotransformer is discussed in this paper. Then a family of isolated and non-isolated interleaved Boost converters with winding-cross-coupled-inductors (WCCIs) is given and analyzed. The inherent relationship between the isolated and non-isolated DC/DC converters with WCCIs is explored. It can be drawn that only part of the energy needs to be transferred from the input side to the load in the non-isolated converters compared with their isolated counterparts. Compared with the conventional interleaved boost converters, the derived interleaved Boost converters can extend the voltage gain, avoid the extreme duty cycle and reduce the switching voltage stress, which are suitable for high step-up and high power DC/DC applications. A clear picture is made in this paper on the DC/DC topology derivation the non-isolated converters from the isolated counterparts.