| Mechanical and Electrical Engineering |
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| EMC performance improvement of auxiliary power supplies in three phase PWM converters |
| WANG Mian, QU Dong chang, CHEN Guo zhu |
| College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China |
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Abstract Auxiliary power supplies of the power electronic devices in three phase pulse width modulation (PWM) converters were interfered by electro magnetic interfere (EMI) noises. Electro magnetic compatibility (EMC) performance improvement of the power supplies was analyzed. The high frequency EMI source caused by high frequency switching devices of the three phase converter was quantitatively analyzed and calculated. The high frequency models of the converter and its auxiliary power supplies were given in detail. Three EMI conduction routes were illustrated based on the high frequency modeling. Route Ⅰ and Ⅱ are between main circuit and the supplies. Route Ⅲ is between different supplies. The equivalent circuits and the corresponding transfer functions of the three conduction routes were obtained through the high frequency model. Methods to suppress the interferences and improve the EMC performance of the auxiliary power supplies were proposed. The simulation and experimental results validate that interference between different supplies is the main EMI noise and can be greatly reduced through paralleled capacitors on the output of the power supplies.
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Published: 01 April 2016
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三相脉冲调制变流器驱动电源电磁兼容性能提升
针对三相脉冲宽度调制（PWM）变流器中开关管驱动电源受到主电路电磁干扰（EMI）的问题进行分析,研究如何提升电磁兼容（EMC）性能.对三相变流器中由于高速开关引起的高频EMI源进行分析与定量的计算,建立三相变流器及驱动电源的高频传导模型.通过建立高频模型,指出EMI源对驱动电源造成的干扰传导通路有3条：主电路与驱动电源间的传导通路Ⅰ和Ⅱ、驱动电源间的传导通路Ⅲ,利用高频模型得到3条传导通路的高频等效电路和相应的传递函数,根据传递函数提出抑制3种干扰、提升驱动电源EMC性能的一般性方法.仿真与实验结果表明,驱动电源间的干扰是主要干扰,通过在驱动电源负载端并联电容的方法可以大大减小干扰.
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