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Common mode inductors (Common mode Choke), also known as common mode chokes, are often used in computer switching power supplies to filter common mode electromagnetic interference signals. In board design, common mode inductors also play the role of EMI filtering, used to suppress the electromagnetic waves generated by high-speed signal lines from radiating outward.
A common mode choke is an electrical component, and it is usually made of two coils wound around the same magnetic core. It is widely used in electronic devices to prevent common mode interference and ensure the stability and reliability of the equipment. A common mode choke is an electrical filter designed to block high-frequency noise common to multiple data or power lines while allowing the desired DC or low-frequency signals to pass through. Common mode (CM) noise current is typically generated by sources such as unwanted radio signals, unshielded electronic devices, inverters, and motors. If this common mode noise is not filtered, it can interfere with electronic devices and circuits. For example, if our computer power supply does not have a common-mode chokes, there may be a lot of interference signals, making the computer run unstably.
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Common-mode chokes generally have two windings, and the two windings are wound on the same magnetic core. This structure is very clever, just like two friends holding hands to protect the circuit. When the common-mode current passes through, it will generate an opposite magnetic field, which can weaken the common-mode noise. In addition, there are many kinds of magnetic core materials for common-mode chokes, and different materials will affect its performance. Common-mode chokes like ferrite cores are more suitable for working under high frequency conditions.
Common-mode chokes work amazingly. When common-mode current flows through common-mode chokes, because the current directions of the two windings are the same, the magnetic fields they generate in the magnetic core are added. As for differential-mode current, the current directions of the two windings are opposite, and the magnetic fields generated will cancel each other out. In this way, common-mode chokes can distinguish common-mode currents from differential-mode currents very well, and then suppress common-mode noise.
The types of common-mode chokes can be classified according to their structure and applicatio
The magnetic core-type common-mode Chokes is usually composed of two coils and a magnetic core. The magnetic core is generally a magnetic material of ferrite or other types of materials. This common-mode Chokes is generally used in low-frequency equipment
The magnetic core-type common-mode Chokes is usually composed of two coils and a magnetic core. The magnetic core is generally a magnetic material of ferrite or other types of materials. This common-mode Chokes is generally used in low-frequency equipment
Intelligent common-mode chokes, this is a special common-mode chokes, which can adjust the inductance and capacitance values according to the actual needs of the circuit.
Inductance is an important parameter of common-mode chokes. Its size affects the suppression effect of common-mode noise. The larger the inductance, the stronger the suppression ability of low-frequency common-mode noise. But it cannot be too large, which may affect the normal operation of the circuit.
This rated current is like the power limit that the common-mode chokes can withstand. If the current in the circuit exceeds the rated current of the common-mode chokes, the common-mode chokes may heat up or even be damaged. Therefore, when selecting a common-mode chokes, it is necessary to select a common-mode chokes with a suitable rated current according to the actual current in the circuit.
DC resistance affects the DC signal transmission in the circuit. If the DC resistance is too large, the DC voltage drop in the circuit will increase, which may affect the normal operation of other components in the circuit.
Common-mode Chokes are widely used in various electronic devices, such as power converters, communication equipment, robots, and traffic auxiliary equipment. They are usually used to prevent interference from common-mode noise.
For example, when electronic equipment is running, noise problems usually occur, especially when electronic equipment uses high frequencies. This is more likely to happen. Common-mode Chokes can help reduce common-mode noise, thereby ensuring the stability and reliability of the entire circuit.
In short, common-mode Chokes are a widely used component in electronic devices to prevent common-mode interference. Their main function is to ensure the stability and reliability of the circuit. Depending on the application, different types of common-mode Chokes can be selected.
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First, choose a suitable common-mode chokes according to the operating frequency of the circuit. If it is a high-frequency circuit, choose a common-mode chokes with good high-frequency characteristics.
Then choose a common-mode chokes with appropriate inductance according to the size of the common-mode noise in the circuit. Also, consider the rated current of the common-mode chokes to ensure that it can withstand the current in the circuit.
In addition, the size and cost of the common-mode chokes are also factors that need to be considered. On the premise of meeting performance requirements, choose a common-mode chokes with appropriate size and low cost.
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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