软磁铁氧体简介软磁铁氧体通常分为Mn-Zn铁氧体和Ni-Zn铁氧体两种.使其在高频电磁应用中成为最好的选择.铁氧体软磁材料主要分为以下三类应用：●小信号铁氧体广泛用在射频电路,电信通讯,网络通信中, 起信号隔离,宽带传输,信号匹配等功能.●功率传递铁氧体广泛用在AC-DC,DC-DC等开关电源的变压器和滤波电感中●抑制电磁干扰铁氧体抑制和吸收各种传和辐射噪声,以满足日益严格的电磁兼容的要求.Mn-Zn软磁铁氧体Mn-Zn软磁铁氧体通常分为功率铁氧体和高磁导率铁氧体两大类.针对不同的行业和具体的应用,这两种材料的具体参数又有进一步的细分.功率材料根据不同的开关频率和功率密度有不同的分类,按照变压器应用还是电感应用也有不同的分类.而高磁导率铁氧体按照用在通讯的信号传输中还是电磁兼容中,对材料的参数也有完全不同的要求,因此, 合理的选择磁性对产品设计的质量至关重要.在深刻理解下游技术和客户需求的基础上,对材料进行深入的开发和应用研究.如针对节能灯用谐振电感和背光源的技术特点开发了相应的功率Mn-Zn 材料.针对通讯用磁芯要求总谐波失真(Total Harmonic Distortion)低的特点和EMC用磁芯要求磁芯的阻抗&频率响应特性好的特点开发了相应的高磁导率材料,来满足客户的不同需求.Ni-Zn软磁铁氧体科力生产的Ni-Zn软磁铁氧体主要用于EMC中抑制电感干扰噪声,该产品具有性能稳定,宽噪声抑制带宽,品种广泛,能够满足客户不同的EMC要求.Soft Ferrite usually divided into two series of materials, including Mn-Zn and Ni-Zn. In order to be a best choice at high frequencies application, We can divided ferrite material into following three kinds:●Small Signal FerriteIt is widely used on Radio frequency circuit, telecommunication and network service. The function include Signal isolation, Broad band transmission and signal match.●Power ConversionIt is widely used in Filter inductance and transformer with switching power, such as AC-DC, DC-DC.●Interference SuppressionTo meet the demand of electromagnetic area, It is can Soft Ferrite Brief Introductionabsorb and suppress all kinds of radiated and noise.Mn-Zn Soft FerriteMn-Zn soft ferrites usually divide into power ferrites and high-permeability ferrites. The concrete parameter of these two material have different classification according to different switch frequency, power density, transformer and inductance application. High-permeability ferrites also have different requests to parameter in communication signaling or electromagnetic area. So, It is important to choose reasonable magnetism for quality of product.Base on the profound understand of the customer demand and application technology, have do many in-depth research about ferrite application. For example, according to the ballast lighting and backlight inverter application, we have developed relevant products. According to the telecom application, we developed the low THD series products. For the EMC application, we have the products with good impedence & frequency response character. So we can afford you the best product and best service.Ni-Zn Soft FerriteNi-Zn soft ferrite mainly used in EMC with suppressing noise of inductance disturbance. This product have the stable property, noise suppressing and variety. It can meet the customer different request.导1. i初始磁导率是磁性材料的磁导率 (B/H)在磁化曲线始端的极限值，即式中,0为真空磁导率(4π×10-7H/m)H 为磁场强度(A/m)B 为低通密度(T)2.有效磁导率μe在闭合磁路中，如果漏磁可忽略, 可以用有效磁导率来表征磁芯的性能。
式中L 为装有磁芯的线圈的电感量(H)N 为线圈匝数le 为有效磁路长度(m)Ae 为有效截面积3.饱和磁通密度Bs ( T )磁化到饱和状态的磁通密度。
见图1。
4.剩余磁通密度Br ( T )从饱和状态去除磁场后，剩余的磁通密度。
见图l 。
5.矫顽力Hc ( A / m )从饱和状态去除磁场后，磁芯继续被反向磁场磁化，直至磁通密度减为零，此时的磁场强度称为矫顽力。
见图1。
6.损耗因数tan δ损耗因数是磁滞损耗、涡流损耗和剩余损耗三者之和tan δ= tan δh + tan δe + tan δr 式中:tan δh 为磁滞损耗因数tan δe 为涡流损耗因数tan δr 为剩余损耗因数7.相对损耗因数tan δ/μ相对损耗因数是损耗因数与磁导率之比:tan δ/ μ适用于材料)tan δ/ μe (适用于磁路中含有气隙的磁芯)8.品质因数Q品质因数为损耗因数的倒数:Q = 1/ tan δ9. 温度系数为温度在T 1 和T 2 范围内变化时，每变化1K 相应的磁导率的相对变化量：式中为温度为时的磁导率为温度为时的磁导率10.相对温度系数α温度系数和磁导率之比，即11.居里温度T c (℃)在该温度下材料由铁磁性(或亚铁磁性)转变成顺磁性。
见图2。
12.减落因数D F 在恒温条件下，完全退磁的磁芯的磁导率随时间的衰减变化，即式中为退磁后分钟的磁导率为退磁后分钟的磁导率初始磁导率μμ(m 2)i (1μ2μT 1 T 2 温度系数αµ (1/K )1μ2μT 1 T 2µ→=0lim i H 01B μHµ=2e N 0.μe eL L A ()=>......21μ21211μ-μ1a .T T μT -T ()=>......r 21μ212221μ-μ1a .T T T -T μ µ r ( 1/K )=>()2......F D 21211μ-μ1.T T μ21log T T 常用符号和定义Mn-Zn 材料特性表性能参数 Parameter 符号 Symbol 单位 Unit 条件 Condition KC40 KL5B KL5 KL7 KL10 KL12 KL15 2300 450050007000100001200015000初始磁导率 Initial Permeabilityμi10kHz/0.1mT±25% ±25% ±25% ±25% ±30% ±30% ±比损耗因素Relative Loss Factor Tan δ/10-620＜5＜5＜6＜7＜7居里温度 Curie Temperature Tc℃ ＞160 ＞140 ＞130 ＞130 ＞100 ＞90比温度系数 Relative Temp.Factor i-0.5~2.0-0.5~1.8-0.5~1.5-0.5~1.5-0.5~1.5℃ 饱和磁通密度 Flux Density Bs mT 100℃ 420400 410 410 410 410 25℃ 剩磁 Remanence Br mT 100℃ 100 90 80 80 25℃ 8766矫顽力 Coercivity Hc A/m 100℃减落因子Disaccommodation factor10-6＜2.5＜3 ＜3 ＜3 ＜1.5 ＜1.5 电阻率 Resistivity ρΩ.m ℃1021 0.3 0.2 0.15 0.15 密度 DensityDk g/m 34800 4900490049005000500025℃60℃25kHz200mT100℃℃60℃ 100℃功率损耗 Power Losskw/m 3100kHz 200mT120℃μi αμD F P V 10-6/℃＞802205503902525100551496.5480025110500410450600807030%Ni-Zn 材料特性表国内外软磁铁氧体厂商材料牌号对照表(Mn-Zn)20K11M11E 30K3V2F 50K5M8B,M9P60K8B 4D260K8C 80K7Q1D K14F1100Q5B 120Q5F125K15254C65K200K13Q2,D1B,D8250KC1Q1C 4B1,4B2300K18D3B 4B3350K2BD1L 400L2H600K25700K264S2750L5800L7HK10850K2828K84A11J1000K30L6H14001500K35L6K74A15G1700382000K374S602300M132400250027003000K38FERRONICSμi KELI TDK STEWARDEPCOSFERROXCUBE国内外软磁铁氧体厂商材料牌号对照表(Ni-Zn)。