Optimization Design Algorithm for Dual-Active Bridge Converters Using Parallel Power Modules

Abstract

This work presents an optimization algorithm for the design of isolated Dual-Active Bridge (DAB) converters using parallel power modules, in which volume, power density, and the number of switching devices are selected to achieve a specific optimal point of operation for giving input/output voltages and power. This point of operation is selected based on the maximum switching frequency that can be used for possible maximum power and minimum volume to obtain the desired power density. The maximum power can be selected based on the number of switching devices that are needed for a given output power and the volume is based on the design of the magnetic components, such as inductors and transformer. The proposed design algorithm selects the magnetic components and the number of switching devices based on an optimal point of operation that maximizes efficiency and minimizes volume to obtain the best volume-to-losses relation for a given switching frequency.