This paper proposes a fifth-order resonant immittance network based dual-active-bridge (DAB) converter and an optimal modulation method that will ensure high-efficiency operation of the converter under wide-range variations in voltage ratio and output power level. The proposed modulation method is based on the concept of total power loss minimization, where a loss model is developed and an optimization algorithm is formulated to compute the optimal set of internal and external phase shift parameters that will lead to the maximum efficiency for a given set of operating parameters including voltage ratio and output power level. It is found that to maintain high-efficiency operation under wide-range variations in voltage ratio and output power level, the DAB converter is required to switch between different operation modes and neither soft-switching operation nor unity-power-factor operation is able to achieve wide-range high efficiency performance when used alone. The importance of reconfigurability of operation mode for achieving wide-range high efficiency performance is clearly illustrated in this paper.
- Dual-active-bridge (DAB) converter
- inductive power transfer (IPT)
- resonant immittance network
- soft-switching (SS) operation
- unity power factor (UPF)
ASJC Scopus subject areas
- Electrical and Electronic Engineering