High-power density DAB-type DC transformer submodule topology and control method thereof
A DC transformer, high power density technology, applied in the direction of DC power input conversion to DC power output, output power conversion device, control/regulation system, etc., can solve the problems of large volume, low power density, etc., to reduce volume, Increased power density, easy to achieve effect of control method
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[0021] Embodiment 1: as figure 1 As shown, a high power density DAB type DC transformer sub-module topology, four half-bridges are connected in series on the input side of the sub-module topology to reduce the voltage stress of each switching device, and the secondary side is a traditional full-bridge structure. By connecting multiple half bridges in series on the primary side and sharing a full bridge on the secondary side, the number of modules is effectively reduced, the volume of the entire DC transformer is reduced, and the power density is increased. Like the traditional DAB converter, this sub-module also controls the transmission power of the system by adjusting the phase shift angle of the primary and secondary sides. In terms of its control strategy, an asymmetric duty cycle control strategy is adopted, so that the switching frequency of the switching tube on the primary side of the transformer is half that of the switching tube on the secondary side, which reduces t...
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