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.
WANG Mian, QU Dong chang, CHEN Guo zhu. EMC performance improvement of auxiliary power supplies in three phase PWM converters. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2016, 50(4): 657-662.
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