Experimental Investigation of a Soft-switching Three-Phase, Three-Voltage Bus DC/DC Converter for Fuel Cell Vehicle Applications

摘要

A soft-switching three-phase, three-voltage (14V/42V/High Voltage) bus dc/dc converter is presented for power management in fuel cell vehicle applications. It features reduced ripple currents, smaller capacitances, high efficiency and a larger power handling capability. The mathematic model is derived and used in the determination of the soft-switching criteria with and without the 14 V bus load current. The topology was verified experimentally with a 6 kW prototype that occupies a small foot print of 19.8 cm X 27.9 cm. The efficiency of the converter is above 96percent in most load conditions with a maximum efficiency of 96.99percent. An efficiency of 95.2percent was achieved at the maximum output power of 6.4 kW in the boost mode. Dynamic response test results in the buck and boost modes are also shown.