Control techniques of the auxiliary-resonant commutated pole in the dual-active bridge

In this work a dual-active bridge dc-dc converter with auxiliary-resonant commutated pole is presented. The paper focuses on the control strategies of the auxiliary-resonant com-mutated pole to allow soft turn on and soft turn off of the main switches, and thus increasing the efficiency of the converter. These strategies are developed for a 5 MW dual-active bridge dc-dc converter. Two boosting strategies, constant time magnetization and constant current boosting, are presented and tested. Besides its main goal of reducing the switching losses, the ARCP also allows balancing of the dc-link voltages, in case of imbalanced loads. The various strategies are introduced and experimental results are presented by using a small scale laboratory setup.

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