Design of the Dual Active Bridge Converter to Minimize RMS Current in Supercapacitor Interface Applications

In applications employing energy storage systems based on supercapacitors (SCs), there are challenges in designing the power converter to interface the SCs due to their inherent terminal voltage variation.Unlike other dc/dc topologies, the
dual active bridge (DAB) topology is suitable for SC interfacing. However, to improve efficiency, a design strategy is required to mitigate conduction losses caused by the wide variation in SC terminal voltage.This  paper proposes a DAB design methodology that defines an optimal turns ratio to minimize the RMS current over SC charging and discharging cycles.The design formulation aims to reduce the DAB RMS current for a general modulation scheme and is implemented for single phase-shift (SPS) modulation.Circuit simulations and experiments on a laboratory prototype with an output power of 250W demonstrate the reduction in RMS current achieved by the proposed design.

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