Modeling and Design of a Medium-Frequency Transformer for High-Power DC-DC Converters

Dual Active Bridge (DAB) converters are an interesting solution for the battery interfaces of storage systems used in traction applications. Due to the environmental conditions and space limitations, the design of the transformer and cooling system is crucial for achieving a high power density. Therefore, in this paper, a detailed design of a transformer with an integrated liquid cooling structure and high isolation voltage is presented. Analytic models for the design are presented and verified through FEM simulations and measurements on a prototype system.