A New Auxiliary Power Supply System of Magnetic Levitation Train Based on SiC MosFet

摘要

This paper takes the advantage of high efficiency, high power density and miniaturization as the research guidance for the maglev vehicle auxiliary converter design. By analyzing the existing auxiliary converter structure and its existing problems, this paper proposes a modal-based LLC converter. Auxiliary converter structure, the structure of the structure before the use of variable-mode LLC converter, with a very wide gain range, can effectively solve the existing auxiliary converter DC-DC front stage complex structure, low efficiency issues. This paper first designs the main circuit structure of the pre-level three-level half-bridge LLC converter and the auxiliary inverter of the three-phase inverter in accordance with the performance requirements of the auxiliary converter, and analyzes the working principle and then studies The control principle and parameter design method of the auxiliary converters focus on the control mechanism and implementation methods of LLC modal control. Finally, the frequency converter control, fixed frequency control, variable modal control and assistance of the LLC converter are verified through simulation and experiments. The correctness and feasibility of converter circuit topology.