High step-up/step-down non-isolated BDC with built-in DC-transformer for energy storage systems

A non-isolated bidirectional DC-DC converter (BDC) is proposed for high step-up/step-down bidirectional power conversion applications. A DC-transformer is integrated into a conventional non-isolated buck-boost BDC to achieve high-voltage conversion ratio and wide voltage/power range regulation simultaneously. The switches are shared by the buck-boost BDC and the DC-transformer. Voltage stresses of...