Independent Output Port Control of Multiport Resonant Converters Using A Novel Switch-Assisted Rectifier

Multiport resonant converters (MPRCs) facilitate efficient power conversion especially in applications requiring unidirectional power flow with multiple isolated output ports. However, deviations may arise between output port voltages, due to mismatches either in loading or in parameters of the multiport resonant network. Existing approaches address these deviations either by introducing controllable series elements into the resonant network, leading to additional losses and/or complexity, or by including active or semiactive bridges at the output ports, which is unnecessary considering the unidirectional nature of the power flow. This article introduces a novel switch-assisted rectifier (SAR) topology to independently control output port voltages and power flow in MPRCs. The proposed SAR-based MPRC incorporates a bidirectional switch (BDS) between the ac terminals of each diode rectifier bridge. A modulation approach is proposed for the SAR, which ensures a low conduction duration as well as soft-switched operation of the BDS, thus minimizing additional losses. The proposed SAR-based strategy enables an independent regulation of the output ports of the resultant MPRC. Further, the proposed solution can be implemented within existing MPRCs by inserting a BDS between the rectifier ac terminals, with no other modifications. The proposed SAR-based MPRC is realized using a recently-developed monolithic GaN-based BDS within a 400/48 V, 10 kW, two-input, four-output MPRC, and validated under closed-loop operation.

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