A non-isolated buck/boost converter features bidirectional power flow capability and a wide output voltage range. The zero-voltage switching (ZVS) can be achieved under triangular current mode (TCM) operation to achieve high power density and high efficiency. Most research have been conducted on the TCM control strategies or low power application designs but rarely on the design of high power TCM buck/boost converter. In this digest, an optimum inductor design methodology for the power conversion between a common dc bus and a wide-range variable dc voltage TCM buck/boost convertor with consideration of the MOSFET turn-off loss is proposed. A 15kW prototype is designed to regulate the voltage from 150V-1000V from a 1.1kV dc bus. The prototype achieves 14.72kW/L power density and over 98.5% full-load/ full-current efficiency.
