The electromagnetic radiation emitted by an AC/DC telecommunication power supply is prone to ex-ceeding the limit standards,so the researches on its electromagnetic radiation mechanism and prediction methods can improve the corresponding electromagnetic compatibility(EMC) design. First,after the analysis of the source and propa-gation path of common-mode(CM) electromagnetic interference in an AC/DC telecommunication power supply module,it is suggested that its far-field electromagnetic radiation can be decomposed into two types,which are driven by input-port and output-port CM voltages,respectively. Then,a novel method of far-field electromagnetic radiation prediction is pro-posed by combining the CM voltage-driven sources with the radiation transfer functions of parasitic radiators. The spec-trum measurement of each CM voltage-driven source is realized by designing a spectrum analyzer and a resistor attenua-tor,and the radiation transfer functions of each parasitic radiator is numerically calculated using an electromagnetic sim-ulation software FEKO. Finally,the radiation prediction of a 4 kW AC/DC telecommunication power supply module was achieved,and the effectiveness of the proposed prediction method was verified by test results.
关键词
AC/DC通信电源/远场辐射发射/电磁预测/电磁仿真/寄生辐射体
Key words
AC/DC telecommunication power supply/far-field radiated emission/electromagnetic prediction/electromagnetic simulation/parasitic radiator
维普
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