Optimized Minimum-Loss Hybrid Multiple Phase Shift Modulation Technique for Dual Active Bridge Converters for MEA Applications

This paper reviews zero-voltage switching (ZVS) possibilities with multiple phase shift modulations for the more electric aircraft (MEA). Three additional triple-phase shift modes are proposed and analyzed in detail based on ZVS conditions beyond the traditional six modes. A minimum peak current stress closed-loop hybrid multiple phase shift (HMPS) modulation scheme based on the proposed modes of operation is presented. Multiple phase shift angles are optimized based on accurate pre-calculation of output current, providing the minimum peak current and decreasing the switching loss, enabling the design of power-dense converters. The proposed HMPS modulation shows higher efficiency at light load and boundary operating points than the existing SPS and unified TPS (UTPS) methods. Finally, a 10kW SiC DAB converter hardware setup for the MEA application is implemented. The efficiency of the setup is up to 96.5%. At boundary operating points, the converter obtains a peak efficiency of 94.7% with the proposed HMPS method. The converter shows peak efficiency improvements of 1%-2% compared to traditional modulation.