CR200J1动车组列供系统电源低频电磁干扰研究

Research on low-frequency EMI of power supply in auxiliary power supply system of CR200J1 EMU

文章分析了四象限整流器的工作原理,对列供系统电源的电场、磁场干扰源进行了分析归纳。在此基础上,对其电磁场发射进行了推导,给出了磁场的频谱特性。最后,测试了CR200J1动车组列供系统的低频磁场,结果表明其磁场发射依然以2.15 kHz的开关频率为主,差模电流是主要的磁场发射源。

This paper analyzes the working principle of four-quadrant rectifier,and summarizes the electric and magnetic interference source of power supply of auxiliary power supply system.On this basis,the electromagnetic emission is derived and the spectral characteristic of magnetic field is given.Finally,the low-frequency magnetic field of auxiliary power supply system of CR200J1 EMU is measured.The result shows that the major magnetic field emission is occupied by 2.15 kHz switching frequency part,and the differential current is key source of magnetic field emission.