TDK铁氧体磁环B64290L0084X087
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≥ 1个¥10.00
TDK铁氧体磁环B64290L0084X087
铁氧体磁芯与配件 102/65.8/15 N87 TOROID
制造商: TDK
产品种类: 铁氧体磁芯 高频磁环 高频导磁环 锰锌铁氧体磁芯 纳米晶软磁芯 非晶合金磁芯 镍锌铁氧体 铁镍钼磁粉芯 铁硅铝磁粉芯
系列: TX102/66/15
产品: Toroids
类型: Ungapped
电感: 2.88 uH
芯体材料: N87
封装: Bulk
商标: EPCOS / TDK
内径: 65.8 mm
外径: 102 mm
外部高度: 15 mm
产品类型: Ferrite Cores & Accessories
工厂包装数量:12
子类别: Ferrites
零件号别名: B64290L84X87
单位重量: 351.420 g
什么是磁环
电子设备辐射和泄漏的电磁波严重干扰其他电子设备正常工作,导致设备功能紊乱、传输错误。因此降低电子设备的电磁干扰(EMI)已经是考虑的问题。
一,吸收
吸收磁环,又称铁氧体磁环,简称磁环。它是电子电路中常用的抗干扰元件,对于高频噪声有很好的抑制作用,一般使用铁氧体材料(Mn-Zn)制成。
磁环在不同的频率下有不同的阻抗特性,一般在低频时阻抗很小,当信号频率升高磁环表现的阻抗急剧升高。大家都知道,信号频率越高,越容易辐射出去(要买的电脑机箱也是要减小电磁泄漏),而一般的信号线都是没有屏蔽层的,那么这些信号线就成了很好的天线,接收周围环境中各种杂乱的高频信号,而这些信号叠加在本来传输的信号上,甚至会改变原来传输的有用信号。那么在磁环作用下,使正常有用的信号很好的通过,又能很好得抑制高频干扰信号的通过,而且成本低廉。所以大家在显示器信号线,USB连接线,甚至键盘、鼠标上看的塑料疙瘩型的一体式磁环就不足为奇了。
二,匝数选择
将整束电缆穿过一个铁氧体磁环就构成了一个共模扼流圈,根据需要,也可以将电缆在磁环上面绕几匝。匝数越多,对频率较低的干扰抑制效果越好,而对频率较高的噪声抑制作用较弱。
在实际工程中,要根据干扰电流的频率特点来调整磁环的匝数。通常当干扰信号的频带较宽时,可在电缆上套两个磁环,每个磁环绕不同的匝数,这样可以同时抑制高频干扰和低频干扰。从共模扼流圈作用的机理上看,其阻抗越大,对干扰抑制效果越明显。而共模扼流圈的阻抗来自共模电感Lcm=jwLcm,从公式中不难看出,对于一定频率的噪声,磁环的电感越大越好。但实际情况并非如此,因为实际的磁环上还有寄生电容,它的存在方式是与电感并联。当遇到高频干扰信号时,电容的容抗较小,将磁环的电感短路,从而使共模扼流圈失去作用。
北京友盛兴业科技有限公司代理供应TDK铁氧体磁芯,欢迎来电咨询
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