Date of Award
Master of Science (MS)
Robert W. Erickson
Dual active bridge (DAB) converters can achieve high efficiencies due to their ability to operate with soft switching. The efficiency of DAB is the highest when its conversion ratio is close to the transformer turns ratio as the inductor current is trapezoidal at this operating point and hence the magnitude of rms currents in the circuit are lower which reduces the losses. Hence, with proper design the dual active bridge can operate with trapezoidal inductor current waveform and zero voltage switching (ZVS) of all its switching devices which will lead to high efficiencies of the DAB. The objective of this thesis is to develop a loss model for optimization of the DAB and to validate it using experimental results.
In this thesis, the steady state solution of a 1:1 DAB is determined using State plane analysis and a loss model is developed. The loss model is used to determine an optimal design for a 2 kW DAB using MATLAB and the 2 kW DAB is built. The experimental results are compared with the theoretical results to prove that the developed loss model is accurate.
Ramnath, Shankari B., "Design and Analysis of a SiC Based Fixed Ratio DC-DC Transformer" (2019). Electrical Engineering Graduate Theses & Dissertations. 34.