A True Bipolar Bidirectional DC Transformer

DC transformer is an important equipment in DC distribution network, and the DC transformer with true bipolar characteristics has complex structure, large volume and high cost. In view of these problems, this paper proposes a topology of true bipolar DC transformer which can be realized with only four switches, and adopts non isolated structure to avoid some adverse effects caused by the introduction of isolation transformer. This paper introduces the basic working principle of the proposed topology, analyzes the working characteristics of the converter under different working modes, adopts voltage source PWM control, and builds a simulation model in MATLAB. The simulation results verify the voltage output capability of the proposed topology and the feasibility of its structure.