Research on Efficiency Improvement of High Frequency Transformer in UPS based on Maxwell

On-line UPS occupies a large proportion in today's standby power market due to its rapid dynamic response and clean power output. The bi-directional DC-DC converter can replace the directional DC-DC in both commercial mode and battery mode of UPS, and realize the sharing of power transformer, inductor and power switch components in two DC-DC circuits, so as to achieve the goal of large charging current, high power density and low cost. In UPS, the loss of magnetic components is the main factor affecting the efficiency of bi-directional converter. In order to improve the efficiency of bidirectional DC-DC, a high frequency transformer is designed. Maxwell software is used in this paper to simulate the transformer losses in different winding arrangements, so as to select the optimal winding arrangements, reducing the transformer winding losses and improving the converter efficiency. Finally, the prototype is made and debugged to verify the feasibility of the design.