布線中磁場耦合的抑制
抑制磁場耦合干擾的方法是屏蔽干擾源。大型電機(jī)、電抗器、磁力開關(guān)和大電流載流導(dǎo)線等都是很強(qiáng)的磁場干擾源,采用導(dǎo)磁材料將其屏蔽起來,在工程上是很難做到的。通常采用一些被動的抑制技術(shù)。當(dāng)回路1對回路2造成磁場耦合干擾時,其在回路2上形成的串聯(lián)干擾電壓UN為:
? (2)
式中:是干擾信號的角頻率,是干擾源回路1形成的磁場鏈接至回路2處的磁通密度,為回路2感受磁場感應(yīng)的閉合面積,是和兩個矢量的夾角。
可以看出,在干擾源的角頻率不變時,要想降低干擾電壓UN,首先應(yīng)當(dāng)減小。對于直線電流磁場來說,與回路1中流過的電流成正比,而與兩導(dǎo)線間的距離成反比。因此,要有效抑制磁場耦合干擾,仍然采用遠(yuǎn)離技術(shù),同時,也要避免平行走線。
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