应用于无线充电系统的SiC MOSFET关断特性分析
Analysis of Turn-off Characteristics of SiC MOSFET Applied to Wireless Charging System
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摘要: SiC MOSFET的关断特性是无线充电系统传输效率和电应力研究的主要内容之一,对系统的安全、高效运行具有重要意义。首先,针对无线充电系统中考虑高次谐波的关断瞬态电流进行建模,并基于数据手册建立SiC MOSFET的关断能量损耗模型;其次,通过计算和仿真验证关断瞬态电流求解的正确性,探讨了关断瞬态电流、关断能量损耗与直流母线电压和输出功率的关系;最后,搭建1 kW LCC-S补偿的基于SiC MOSFET的无线充电系统进行实验验证,结果证明在全输出功率范围内,应用于无线充电系统的SiC MOSFET具有恒关断电流和恒关断损耗的特性。Abstract: The turn-off characteristic of Si C MOSFET is one of the main contents of the research on transmission efficiency and electrical stress of wireless charging systems, which is important for the safe and efficient operation of the systems. Firstly, the turn-off transient current is modeled for the wireless charging system considering the higher harmonics, and the turn-off energy loss model of Si C MOSFET is established based on the datasheet of MOSFET. Secondly, the correctness of the turn-off transient current is verified by calculation and simulation, and the relationship between the turn-off transient current, turn-off energy loss and DC bus voltage and output power is discussed. Finally, a 1 k W LCC-S compensated wireless charging system based on Si C MOSFET is built for experimental verification. Experimental results show that the Si C MOSFET used in the wireless charging system has the characteristics of constant turn-off transient current and constant turn-off loss in the full output power range.
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