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Difference Between Common-Mode Inductors and Differential-Mode Inductors
The most common common mode inductor in daily life is computer applications. The motherboard inside the computer is mixed with various high-frequency circuits, digital circuits and analog circuits. When they work, they will generate a large amount of high-frequency electromagnetic waves that interfere with each other. This is EMI. Common mode inductors and differential mode inductors are two electronic components that are particularly commonly used. For most electronic products, they are very important electronic components. People often compare common mode inductors and differential mode inductors. So today we will briefly introduce the differences between common mode inductors and differential mode inductors
Common Mode Choke Principle
Common mode inductors and differential mode inductors are both effective components for resisting electromagnetic interference and are widely used in various filters, switching power supplies and other products. However, common-mode inductors are used to suppress common-mode interference, while differential-mode inductors are used to suppress differential-mode interference. Both are relatively important filter inductors.
Common mode inductors are common-mode interference suppression devices with ferrite as the core. They are composed of two coils of the same size and number of turns symmetrically wound on the same ferrite magnetic ring core to form a four-terminal device. It has a large inductance and can suppress common mode signals, but the leakage inductance is very small and has almost no effect on differential-mode signals.
The principle is that when the common-mode current flows through, the magnetic flux in the magnetic ring is superimposed on each other, so it has a considerable inductance, thereby suppressing the common-mode current. When the differential-mode current flows through the two coils, the magnetic flux in the magnetic ring cancels each other, and there is almost no inductance, and the differential-mode current can pass without attenuation.
Therefore, common-mode inductors can effectively suppress common-mode interference signals in balanced lines without affecting the differential-mode signals normally transmitted on the lines.
Differential mode inductance is a characteristic of a closed loop, that is, when the current through the closed loop changes, an electromotive force will appear to resist the change in current. This inductance is called self-inductance and is a characteristic of the closed loop itself. Assuming that the current in one closed loop changes, an electromotive force will also be generated in the other closed loop due to induction. This inductance is called mutual inductance. Inductors are circuit components specifically used to implement inductance in circuits. A solenoid is a simple inductor, which refers to a multi-wound wire (called a “coil”), which can be hollow or have a metal core inside.
The inductance of a solenoid is self-inductance. A transformer is an inductor composed of two coupled coils. Because it has mutual inductance characteristics, it is a basic magnetic circuit component.
Although both inductors are filter inductors, their different functions determine that their appearance and winding methods will also be different. For common-mode inductors, they are wound on the same iron core, and the wire diameter and number of turns of the two sets of windings are the same, but the winding directions are opposite. A set of coils has two pins, so the common-mode inductor will have 4 pins.
The differential-mode inductor is wound on the iron core, with only one coil, so there are only 2 pins. Therefore, the number of pins can be used to distinguish between common-mode inductors and differential-mode inductors.
Advantages of Zxcompo Inductors
Zxcompo products include multilayer power inductors, wound surface mount inductors, and molded surface mount inductors for power and signal lines. A full range of passive electronic and magnetic components including inductors, capacitors, resistors, transformers, and filters are available. Our products are widely used in automotive, telecommunications, consumer electronics, and other fields. Each product is designed to achieve performance and maximize signal and power efficiency while saving space.
Other advantages include:
Fully automated manufacturing
High reliability AEC-Q200
ISO 9001 quality standards
RoHS compliant
REACH compliant
Why choose Zxcompo?
Our company has more than 1,000 types of inductors and 15 years of experience in this field. It is a product that produces extremely low resistance over a wide frequency range. Zxcompo is widely recognized by a global technical team for designing, manufacturing, and providing high-quality, high-performance signal integrity and noise filtering solutions.
Zxcompo brand inductors, also known as coils or reactors, are passive electronic components that resist changes in the current flowing through them. Core material, winding type and geometry play a critical role in the performance of power inductors. Shipping worldwide. Simply contact us for samples: sales@ZXcompo.com.
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