Abstract
In this paper, a new auxiliary power supply system of magnetic levitation based on the LLC DC-DC converter is proposed. The switches of the DC-DC converter are SiC MOSFET, which enables high frequency, high temperature, and high power density. For further improving the efficiency of the system and realizing the stability of the output voltage under different load conditions, the digital synchronous rectification (DSR) based on the phase shift control strategy is proposed. The prototype of the LLC DC-DC converter based on SiC MOSFET is implemented, which can realize zero voltage switching (ZVS) and zero current switching (ZCS). Then, the thermal image of DSR is presented, which proves that the power loss of SiC MOSFET with DSR is relatively low. Additionally, the system efficiency among the Si IGBT, SiC MOSFET, and SiC MOSFET with DSR is analyzed and the prototype demonstrates 98% peak efficiency. Finally, simulations, experiments, and data analysis prove the superiority of the proposed DSR strategy for the new auxiliary power supply system of magnetic levitation.
Highlights
With the rapid development of China’s economy, the urban railway system has earned worldwide plaudits for its efficiency, reliability, and portability
To improve the series-parallel converter which is composed of two inductive components and one capacitive performance of series resonant converter (SRC) and parallel resonant converter (PRC), an asymmetric LLC DC-DC converter is proposed in Reference [17]
For improving the efficiency of the converter, the SR used in the secondary side of the LLC DC-DC converter was designed
Summary
With the rapid development of China’s economy, the urban railway system has earned worldwide plaudits for its efficiency, reliability, and portability. The existing magnetic levitation power supply system is illustrated, including the auxiliary power supply system, traction converter module, and suspension control module. The DC traction network is the input of the magnetic levitation train power supply system. The input voltage of the DC traction network is 1500 V. The existing auxiliary power supply system in the magnetic levitation train has the disadvantage of being bulky and inefficient. How to improve the efficiency of the system and how to reduce the volume and weight of the auxiliary power supply system have been a major design challenge [3,4]
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