Design and control of the dual-interleaved boost converter with interphase transformer

This Thesis examines the operation and dynamic characteristics of the dual-interleaved boost converter with interphase transformer. Due to its inherent high efficiency and potential for miniaturisation, the circuit is of particular interest for the emerging applications in electric vehicle power trains, for example to interface a low voltage fuel cell or battery to a high voltage traction system. The steady-state analysis of the converter focuses on understanding the shapes of the interphase transformer currents and identifying the boundary condition for continuous conduction of the transformer windings. The analysis Is also seen to be applicable to a modified version of the converter in which the freewheel diodes are replaced by a second pair of transistors, enabling zero voltage switching by appropriate choice of the interphase transformer inductance. The analysis predicts approximately the boundary of zero voltage switching operation.