产品别名 |
开关电源铁氧体磁芯,锰锌铁氧体,锰锌铁氧体磁芯,纳米晶软磁芯 |
面向地区 |
产地 |
其它 |
|
品牌 |
TDK |
材质 |
其它 |
气泡膜宽度 |
33厘米 |
适用范围 |
工厂 |
颜色 |
其它 |
TDK铁氧体磁芯B65981Q0400K097
铁氧体磁芯与配件 PQ50/50-N97-DG400
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: PQ50/50
产品: Ferrite Cores
类型: Distributed Gap
核心: PQ Core
芯体大小: PQ 50 x 50
电感: 400 nH
芯体材料: N95
封装: Tray
商标: EPCOS / TDK
外部高度: 25 mm
外部长度: 50 mm
外部宽度: 32 mm
产品类型: Ferrite Cores & Accessories
工厂包装数量:36
子类别: Ferrites
零件号别名: B65981Q400K97
一,磁环的特性和应用
磁环的特性与磁珠类似,锰锌磁环特性曲线如下图所示:1MHz时磁导率下降到1000,1.05MHz时电感消失,同时损耗因子在1MHz时急剧上升,电阻特性(涡流损耗)逐渐明显;阻抗频率曲线在电感消失的频点出现大值。
1. 低频段阻抗主要由电感的感抗构成:电阻很小,电磁干扰主要通过反射抑制,器件呈现低损耗高Q特性电感;此时容易造成在低频段谐振,可能出现干扰增强现象;
电感L与寄生电容C,在高Q情况下容易造成LC振荡,具体“开关电源”章节分析。
2. 高频段阻抗主要由电阻构成:随着频率升高,磁芯磁导率降低,导致电感量减小,感抗成分减小,而电阻成分增加(涡轮损耗);电磁干扰被吸收并转化成热能的形式耗散掉;
3. 磁环安装在靠近干扰源的地方,对于输入输出电路,尽量靠近屏蔽壳进出口处。
的确,磁环与磁珠的整体特性非常接近,但是它们之间的应用场景又完全不同,那我们应该在什么情况下选择怎样的磁环呢?
1. 需要考虑两个方面因素:
1, 磁环的频率-阻抗特性和被滤波电路的干扰特性;
如果被滤波电路的EMI频段与磁环涡流损耗频段不同,那么磁环起不到应有的作用。
2, 外观上选择:尽量长,尽量厚,内径尽量小,电感量尽量小的磁环,及磁环越长越好,孔径与所穿电缆结合越紧密越好;
磁环尽量长、尽量厚、内径尽量小(线缆结合紧密):线缆的磁力线尽量多的穿过磁环,高频噪声能量尽可能多的消耗在磁环内;电感量尽量小:避免对正常信号的影响,以及低频振荡。
2. 绕线匝数越多,抑制低频干扰效果越好,而高频噪声抑制较弱;当干扰频带较宽时,可以套上两个磁环,绕不同匝数,用于抑制不同频段噪声;
磁环存在寄生电容,该寄生电容与电感并联,遇到高频干扰信号时,寄生电容将磁环的电感短路失去作用;所以一般低频干扰,绕2~3砸,高频干扰不能绕砸,选用长一点的磁环。
3. 通过磁环的电流大小正比于磁环的体积,两者失调容易造成磁饱和,降低元件性能;避免失效的方法是将两根线(V+/V-)同时穿过一个磁环;
类似共模电感器的工作原理,起到共模抑制的作用。
4. 抑制高频干扰信号时,选择镍锌铁氧体;反之使用锰锌铁氧体。
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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