Abstract
A high efficiency dual active bridge with coupled inductor (DABCI) for fuel cell vehicles is proposed in this article and its operation principle is analyzed to reveal the optimal operation modes of this converter, which provides the basis for circuit parameters design. Compared with dual active bridge, the DABCI is more suitable for high voltage gain applications because its low voltage bridge works like interleaved boost circuit and it is easy to get high voltage gain by adjusting the duty cycle D. In order to reveal the best operation mode of the DABCI, an optimal current stress modulation strategy is proposed, which can realize zero voltage switching operation in wide load range for all switches. Furthermore, the input current ripple is suppressed by interleaving two boost circuits in low voltage bridge, which can extend the life span of fuel cell vehicles. In addition, advanced magnetic integration technology is adopted to improve the system power density. Finally, a 4-kW rated prototype is made and experimental results are presented to verify the previous analysis.
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