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Common Mode Line Filter is a passive electromagnetic device that permits the passage of the desired electrical signals through data or power lines while filtering out the unwanted high-frequency noise signal from external sources or other circuits of the system.
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Common mode line filter is a common type of coil inductor structure, typically featuring a dual-wire wound configuration. It consists of two parallel coils, connected through a magnetic material (such as a ferrite core), which enhances the electromagnetic coupling between the coils and results in a high inductance coefficient. It utilizes magnetic materials as leads and it usually has a U-shaped profile, and includes pinholes. A common mode line filter is an electronic component used for signal filtering in electronic circuits and electromagnetic interference (EMI) suppression in power circuits . Common mode filters are widely used in filtering, resonant circuits and other applications, effectively suppressing differential-mode noisewhile mitigating interference sources.
The design of a common mode line filter requires careful consideration of parameter selection and optimization.
it is essential to determine the required inductance value, which is generally based on the circuit requirements and design objectives.
It is crucial to select the appropriate winding method and materials . The winding method should be chosen according to circuit needs and coil size, while material selection must consider magnetic permeability and cost factors.
attention must be given to the interaction between inductors and electromagnetic interference with other components to ensure optimal performance.
The design parameters of a common-mode line filter affect its electrical performance. Below are some common technical parameters:
he rated inductance of a common-mode line filter refers to its inductance value at a specific operating frequency. Inductance is typically measured in microhenries (µH)—the higher the value, the greater the impedance to low-frequency signals.
DC resistance represents the resistance to direct current flowing through the inductor. A lower DCR reduces power loss and heat generation in the component.
This is the maximum allowable current that can pass through the inductor under normal operating conditions. Exceeding this value may cause coil overheating or even component failure.
This is the highest permissible temperature at which the component can function reliably. Exceeding this limit may lead to deformation or performance degradation.
This defines the minimum and maximum frequencies at which the filter maintains its rated performance. If the operating frequency exceeds this range, the component may fail to function properly.
Common-mode line filters are available in various packaging styles, such as open-frame, surface-mount (SMD), and flat-wire coil design. Selecting the appropriate package helps optimize circuit layout and installation.
Established in 2013, Shenzhen Kunyo Technology is committed to designing and manufacturing custom magnetic components, including high-frequency transformers, low-frequency transformers, audio transformers, power transformers, and inductors.
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