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Experimental investigation of a soft-switching three-phase, three-voltage bus DC/DC converter for fuel cell vehicle applications

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2 Author(s)
Lixin Tang ; Oak Ridge Assoc. Universities, Oak Ridge, TN ; Gui-Jia Su

A soft-switching three-phase, three-voltage (14 V/42 V/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 times 27.9 cm. The efficiency of the converter is above 96% in most load conditions with a maximum efficiency of 96.99%. An efficiency of 95.2% 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.

Published in:

Power Electronics Specialists Conference, 2008. PESC 2008. IEEE

Date of Conference:

15-19 June 2008