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This paper proposes an improved method for the loss estimation of a Dual Active Bridge (DAB) using frequency domain modelling. The method uses a detailed, frequency depending transformer model to describe even highly utilized DABs. The model is used to estimate the occurring losses of a DAB as part of an modular Solid State Transformer (SST). The influence of the SST's phase power ripple is considered for the loss estimation. The results of the frequency domain model and the loss calculation are validated using measurement data of an SST-cell prototype.

This paper shows the design process of a planar Rogowski coil integrated in the Printed-Circuit-Board (PCB) for direct current slope measurement. Focus lies on the analytic estimation of the coil parameters with respect to specific limitations and the analog signal processing for a simplified design process. All analytic derivations are verified by measurements.

This paper presents a novel approach for transitions between operating points for the dual active bridge converter. The method is applicable to arbitrary modulation schemes. Steady state operation is attained after one switching period while the correct power transfer during the transition is ensured. The paper outlines the analytical deriviation of the method. Simulation results and measurement data validate the approach.

In this paper an accurate capacitance time domain model (CTD) of the Zero Voltage Switching (ZVS) behaviour of a Dual Active Bridge considering deadtime, MOSFET Drain-Source capacitances and transformer stray inductances is presented. Building upon this a DAB model considering voltage-time errors caused by resonant commutation for Single Phase Shift (SPS) and Triple Phase Shift (TPS) is derived. Additionally a formula to calculate the optimal deadtime according to the CTD is proposed. Measurements at different operation points validate the consistency of the resonant commutation model and the voltage-time error model for the DAB.