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通过对电力载波通讯中辐射噪声分析,建立了基于共模电流的辐射干扰模型,研究了铁氧体磁环的高频等效电路、射频传输线模型及其噪声抑制机理,提出了采用高性能噪声分离网络提取线缆共模电流的方法.结果表明:加载磁环后,辐射噪声降幅可达9 dB;当磁环距被测设备30cm时,辐射噪声降幅高达19 dB,与理论研究吻合性较好,并对PLC辐射噪声分析与抑制有积极意义.
Based on the analysis of radiated noise in power line communication, a model of radiated interference based on common mode current was established. The high frequency equivalent circuit, RF transmission line model and noise suppression mechanism of ferrite magnetic loop were studied. The high performance noise The results show that the radiated noise can drop by 9 dB when the magnetic ring is loaded, and the drop of radiation noise is as high as 19 dB when the magnetic ring is 30 cm away from the device under test, which is in good agreement with the theoretical research Good, and the analysis of the radiation and noise of the PLC has a positive meaning.