technical advantages better efficiency high current with high inductance value only solution for some high speed signal (USB, CAN…..) 技术优势 提高效率 大电流和高感值 唯一的一些高速信号解决方案 例如：(USB, CAN…..)
2009
WRTH ELEKTRONIK EISOS GMBH & CO. KG
伍尔特电子有限公司(Eisos) 伍尔特电子有限公司(Eisos)
CURRENT COMPENSATED CHOKES
-SELECTION & APPLICATIONS –
-电流补偿扼流选型和应用 电流补偿扼流选型和应用 电流补偿扼流
10000
common mode impedance
1000
共模阻抗 differential mode impedance 差模阻抗
10
100பைடு நூலகம்
1 1 10 100
Würth Elektronik eiSos 2009
1000
f/MHz
Common Mode Choke共模扼流圈
different designs不同的设计 bifilar双绞线式 sectional分段绕组
general industrial applications power supplies 一般用于工业 电源
WE-LF SMD:
+ special size + Isolation to components around + mechanical protection of winding and core + easy to place + reflow solderable + defined solder pad + 特殊的尺寸 + 绝缘 + 机械保护磁芯和绕组 +易存放 + 可过回流焊 + 规范的焊盘
Common Mode Choke共模扼流圈
WE-FC :
International size (Europe, Asia, US)国际尺寸 (欧洲，亚洲， 美国) + highest leakage inductance+ 极大的漏电感 + small size+ 小尺寸 + excellent high frequency 高频 + high voltage burst performance+ 高压工作 - only for small currents available - （紧应用于小电流）
Würth Elektronik eiSos 2009
Why current compensated?为何要电流补偿 ?
economic advantages more expensive than SMD ferrite easy to make more turnover 经济优势 比贴片铁氧体价格高 更简单的制作工艺
Würth Elektronik eiSos 2009
differential mode common mode
Common Mode Choke 共模滤波器
best solution to filter noise close to signal frequency 最好的方案过滤噪声接近信号频率
+ 特殊尺寸 + 高频衰减 + 瞬间衰减 ( IEC 61000-4-4)
Common Mode Choke共模扼流圈 WE-LF :
European standard component + Isolation to components around + Mechanical protection of the core + easy to place 欧标元件 + 绝缘 + 机械保护磁芯 + 易存放
1,8mH
27mH 47mH 47mH 47mH
WE-LF
Typ M Typ S
Typ XXL Typ XL Typ L 1mH 1mH 1mH 1mH 39mH 20mH 20mH 1mH 20mH
0,5mH 20mH
14 - 35A
Filtertopologien
Simulation
Why current compensated? 为何要电流补偿?
reduction of interferences outwards your device inwards your device 减少干扰 外部设备 内部设备
result: no“ or low influencing of used signal high attenuation of interferences 结果: 没有或者对有用信号的干扰很小 差模 阻止衰减 共模
10000 comm. bifilar diff. bifilar comm. sectional diff. sectional 1000
Impedance [Ohm]
100
10
1 1 10 100 1000
Frequency [MHz]
Würth Elektronik eiSos 2009
Common Mode Choke共模扼流圈分段绕组
small power supplies (line und load filter) lighting technology small size applications 小功率电源 (线与负载滤波) 照明技术 用于小尺寸
Würth Elektronik eiSos 2009
Common Mode Choke共模扼流圈
current compensated choke = common mode choke – WHY?
电流补偿扼流 = 共模扼流 – 为什么呢?
Würth Elektronik eiSos 2009
EMV-Allgemein
Grundlagen
Filter&Signale
Einfügedmpfung
High 高 Low 低
low to medium 低到中等 medium中等
Independent独立
depends on core“ 依靠，磁芯
Low低
Würth Elektronik eiSos 2009
High高
Common Mode Choke共模扼流圈
Measurement测量
Impedanz Impedanz阻抗/
LS ~ 0,01 … 0,1 % * LR
Würth Elektronik eiSos 2009
LS ~ 0,5 … 2% * LR
Common Mode Choke共模扼流圈
different designs 不同设计 WE-SL2 744226 bifilar winding双线绕组 WE-SL2 744226S sectional winding分段绕组
low leakage inductor 低漏电感
low voltage application (42 VAC / 80V DC) 应用于低压 (42 VAC / 80V DC)
Würth Elektronik eiSos 2009
Common Mode Choke – Main advantages共模扼流圈– 主要优点
10000
Impedanz /
1000
common mode impedance 共模阻抗 used signal (differential mode) 有用信号 (差模 differential mode impedan
100
noise (common mode)
10
差模阻抗
共模噪声
1 1 10
small power supplies 小功率
WE-CMB:
+ special size+ 特殊的尺寸 + product with high nominal current产品要求的高额定电流 + very small size + 很小的尺寸
small size applications用于小尺寸 high current applications用于大电流 motor driver马达驱动
When do we offer a sectional winding ?什么时候我们提供下面的共模线圈? power supply : "high" voltage application signal : low and high speed signal 电源 : 应用高压 信号 : 低高速信号 only solution to guarantee distances between the two winding according to IEC60938 or UL1283 max. voltage application : 250 VAC / DC high leakage inductor 提供方案保证量绕组的距离，是依据IEC60938 or UL1283 应用最大电压 : 250 VAC / DC 高漏电感
single choke 单扼流圈
common mode impedance共模阻抗 differential mode impedance差模阻抗 dependency of impedance from load current阻抗依赖于负载 电流 attenuation of used signal有用信号的衰减
Würth Elektronik eiSos 2009