Dual Active Bridge - Magnetic Component Configurations for High Boost Application

摘要

This paper deals with the design of magnetic components used in selected Dual Active Bridge (DAB) converter configurations for high boost (isolated/non-isolated) Photovoltaic (PV) application. A set of topologies, namely, i) Single DAB converter with input filter, ii) DAB converter embedded with input 2-inductors boost stage, iii) input-output cascaded in DAB converter are compared to investigate the high frequency (HF) transformer design, overall weight, and volume of the magnetic components, semiconductor voltage/current stress level. In a high-frequency transformer, design number of parallel wire and number of layers play a crucial role in low voltage (LV) side to limit the copper losses due to high-frequency effects. A comparison is done by splitting the transformer into a number of reduced rating transformer with LV winding in parallel and HV winding in series. Such transformer configuration has reduced the number of layers in LV side, low HF losses and simple construction. The performance of the converter with the grid is highlighted. Simulation results from 1.5 kW power converters are presented.