行业组件数据 · 2026

共模扼流圈

共模扼流圈是一种电感器,在单个磁芯上设计有两个或多个绕组。

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共模扼流圈是一种电感器,在单个磁芯上设计有两个或多个绕组。它用作滤波器,通过向共模信号呈现高阻抗来衰减共模电磁干扰(EMI),同时允许差模信号以最小损耗通过。在以太网磁性元件中,它集成在变压器中,以提供噪声抑制和信号完整性,确保数据通过双绞线传输。 共模扼流圈基于互感原理工作。当共模噪声电流沿同一方向流过绕组时,它们在磁芯中产生的磁场叠加,形成高阻抗,从而阻断这些不需要的信号。差模信号(数据信号)以相反方向流过绕组,导致其磁场相互抵消,从而产生低阻抗,使信号不受影响地通过。

组件规格

定义
共模扼流圈是一种电感器,在单个磁芯上设计有两个或多个绕组。它用作滤波器,通过向共模信号呈现高阻抗来衰减共模电磁干扰(EMI),同时允许差模信号以最小损耗通过。在以太网磁性元件中,它集成在变压器中,以提供噪声抑制和信号完整性,确保数据通过双绞线传输。

共模扼流圈基于互感原理工作。当共模噪声电流沿同一方向流过绕组时,它们在磁芯中产生的磁场叠加,形成高阻抗,从而阻断这些不需要的信号。差模信号(数据信号)以相反方向流过绕组,导致其磁场相互抵消,从而产生低阻抗,使信号不受影响地通过。
工作原理
The common mode choke operates on the principle of mutual inductance. When common mode noise currents flow through the windings in the same direction, they generate magnetic fields that add up in the core, creating high impedance that blocks these unwanted signals. Differential mode signals (data signals) flow in opposite directions through the windings, causing their magnetic fields to cancel out, resulting in low impedance and allowing the signals to pass through unaffected.
材料
铁氧体磁芯(例如锰锌或镍锌铁氧体)、铜线绕组(通常为漆包线或绝缘线)以及用于保护的环氧树脂或塑料外壳。
Impedance
High at common mode frequencies (e.g., 100 Ω at 100 MHz)
Inductance
Typically 100 μH to 10 mH
DC Resistance
Low, e.g., < 1 Ω
Current Rating
Up to several amperes
Frequency Range
1 MHz to 1 GHz
Operating Temperature
-40°C to +125°C
标准
ISO 11801DIN EN 50173

行业分类与别名

共模扼流圈 的常用贸易名称、技术标识和检索关键词。

上级产品

该组件会出现在以下整机或工业产品中。

FMEA · 风险与缓解

诱因 → 失效模式 → 工程缓解

Excessive current or voltage spikes->Core saturation or thermal overload->Implement current limiting circuits, use chokes with higher current ratings, and ensure proper heat dissipation.
Mechanical stress or environmental exposure->Cracked core or damaged windings->Use robust encapsulation materials, conduct vibration testing, and follow proper handling and installation procedures.
Manufacturing defects in windings or core->Reduced inductance or increased DC resistance->Apply quality control measures, such as automated testing and inspection, and source components from certified suppliers.

工业生态与工程逻辑

0
Overheating due to excessive current
1
Core saturation leading to loss of filtering effectiveness
2
Mechanical damage from vibration or shock
3
Degradation of insulation causing short circuits

合规与检测

tolerance
Inductance tolerance typically ±20% to ±30%, depending on application requirements
test method
Testing per IEC 60950 for safety, and EMI/EMC testing per FCC Part 15 or CISPR 22 standards.

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技术文档
4/5
制造能力
4/5
可检验性
5/5
供应商透明度
3/5

这些分值是采购评估维度示例,不代表真实客户评分、具体国家买家反馈或实时询盘。

相关组件

常见问题

What is the purpose of a common mode choke in Ethernet magnetics?

It suppresses common mode noise and electromagnetic interference (EMI) to ensure signal integrity and compliance with regulatory standards in Ethernet communication systems.

How does a common mode choke differ from a differential mode choke?

A common mode choke blocks noise currents flowing in the same direction on both conductors, while a differential mode choke attenuates noise currents flowing in opposite directions. Common mode chokes are often used in conjunction with differential mode filtering for comprehensive EMI suppression.

What materials are commonly used in common mode chokes?

Ferrite cores (such as Mn-Zn or Ni-Zn) for high permeability and frequency performance, and copper windings for low resistance and efficient current handling.

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