氮化镓功率变换器电磁兼容优化设计方法研究

Study on electromagnetic compatibility optimization design method of gallium nitride power converter

摘要

由于电力电子电路中存在高频寄生参数，功率器件暂态开关过程中存在高频振荡，功率变换器产生共模电磁干扰，影响系统中的敏感器件，降低了功率变换器的可靠性和整体效率。针对氮化镓 Buck 功率变换器的电磁干扰进行分析，建立 Buck 功率变换器的等效电路模型，得到氮化镓功率器件开关振荡与寄生参数之间的函数关系。然后，提出一种基于 ANSYS 的氮化镓功率变换器电磁兼容优化设计方法，建立电路联合仿真模型，分析 Buck 功率变换器 PCB 板优化前后寄生参数对氮化镓功率器件开关振荡的影响。最后，通过实验验证了氮化镓功率器件开关振荡的抑制效果。

Abstract

Due to the existence of high-frequency parasitic parameters in power electronic circuits, high-frequency oscillation occurs during the transient switching process of power devices, resulting in common-mode electromagnetic interference in power converters. This interference affects sensitive components in the system and reduces the reliability and overall efficiency of power converter. This paper analyzes the electromagnetic interference of a gallium nitride buck converter, establishes an equivalent circuit model of the buck converter, and obtains the functional relationship between the switching oscillation of gallium nitride power devices and parasitic parameters. Then, an optimized design method for electromagnetic compatibility of gallium nitride power converters based on ANSYS is proposed. A joint circuit simulation model is established to analyze the impact of parasitic parameters on the switching oscillation of gallium nitride power devices before and after the optimization of PCB board of the buck converter. Finally, the suppression effect of the switching oscillation of gallium nitride power devices is verified through experiments.

关键词

氮化镓功率器件 / 电磁干扰 / 寄生参数 / 开关振荡 / ANSYS 仿真

Key words

gallium nitride power devices / electromagnetic interference / parasitic parameters / switching oscillation / ANSYS simulation

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基金资助

国网陕西省电力有限公司科技项目(5226KY230018)