Parameters mismatch analysis for the Active-Bridge-Active-Clamp (ABAC) converter

The Dual-Active-Bridge has become the most common choice in modern isolated, bidirectional DC/DC conversion stages where high efficiency, galvanic isolation and large voltage conversion ratios are required. However, in low voltage high current applications, the current ripple on the low voltage side may be considerably high, thus requiring large capacitive filtering. As an alternative to the standard Dual-Active-Bridge, an Active Bridge, Active Clamp (ABAC) converter is presented in this paper which simplifies the low voltage side filtering by cancelling the load current ripple through interleaving. This paper introduces the ABAC topology operated with Single Phase Shift modulation and analyses the impact of different parameters mismatch on DC current sharing and current ripple cancellation between the interleaved channels. The theoretical findings are validated in simulation and experiment on a 10-kW ABAC converter.