Abstract
In this paper, the essential reason of causing the dual-side reactive currents in the isolated dual active bridge (DAB) DC-DC converter is revealed. It is because that the output voltages of the two H-bridge converters of the DAB converter can not keep their polarities the same as the inductor current all the time. The constraint between the two inner phase shifts and the outer phase shift is determined according to the operating characteristics of the DAB converter to ensure that within the switching period, the two voltages are changed around the zero-crossing point of the inductor current. As a result, the dual-side reactive currents will not be caused at all. The detailed simulation results of the proposed modulation strategy validate its accuracy and validity.
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