The requirements for energy storage bidirectional converters operation over a wide voltage operation range are still a technical challenge. To overcome the state-of-the-art limitations, the proposed DAB-based converter topology employs a switch combination for parallel-series bridges configuration. The switching nodes of the low-voltage (LV) bridges are separately connected at the two transformer terminals. The dc ports of the two LV-bridges are interconnected through a switch interface which allows them to operate in a parallel-series fashion. The DAB-based converter with the switch interface doubles the voltage utilization range, which enables a broad range of applications for batteries (e.g. 48-V, 120-V).
