Adapted Auxiliary-Resonant Commutated Pole in the Dual-Active Bridge

In this paper, a dual-active bridge direct current (dc)–dc converter with an adapted auxiliary-resonant commutated pole (ARCP) concept is presented. First, the classic ARCP is reviewed and subsequently, the adapted concept is explained. The adaptions guarantee a zero-voltage switching without applying an additional boost current as needed in the classic ARCP approach. Thus, the complexity of the resonant commutations is reduced and reliability can be increased. To obtain the optimal auxiliary switch, various power-electronic devices are compared in view of controllability, speed, and conduction losses in the second part. Possible auxiliary switch configurations for a high-power application are discussed, and measurement results are illustrated. Here, integrated gate-commutated thyristors, thyristors, and insulated-gate bipolar transistors in combination with SiC diodes are compared, and differences in the switching behavior are presented. Finally, experimental test results of the converter at low voltages are presented.