What is the difference between common mode inductance and differential mode inductance?

Common mode inductor is an inductive component that plays an important role in circuit principles and electronic equipment manufacturing, and is commonly used to suppress common mode interference in circuits. Common mode interference refers to electromagnetic interference that affects two signals in a circuit simultaneously, usually from external environments or other circuits. This article summarizes some information and hopes to provide valuable reference for readers.

Common mode inductors can improve the anti-interference performance of power supplies, reduce signal distortion and noise, and ensure the reliability and characteristics of power supplies. It is usually placed between the two power cords of a power supply and connected to a ground wire. When a common mode signal enters a circuit, it can be absorbed by a high impedance common mode inductor and energized through a ground wire. Therefore, common mode inductors can improve the anti-interference performance of the power supply and reduce signal distortion and noise. In addition, the common mode inductor can also be used as a part of the differential mode circuit to improve the performance and stability of the power supply.

Different types of common mode inductors can choose different core materials, such as ferrite, nickel zinc ferrite, magnetic stainless steel, etc. In practical applications, using suitable iron core materials can improve the performance and anti-interference of common mode inductors.

The parameters of common mode inductance include inductance value, rated voltage, resistance measurement, frequency response, etc. These parameters should be selected according to the provisions of the power supply to ensure the normal operation of the common mode inductor and provide better common mode suppression effects. When selecting, please refer to the specifications and application guidelines provided by the common mode inductor manufacturer.

Both common mode and differential mode inductors are inductive components, but their functions and application fields are different.

Common mode inductors are commonly used to suppress common mode interference in circuits. Common mode interference refers to electromagnetic interference that affects two signals in a circuit simultaneously, usually from external environments or other circuits. Common-mode inductors are typically placed between the two power lines of a power supply and connected to a ground wire. When a common mode signal enters a circuit, it can be absorbed by a high impedance common mode inductor and energized through a ground wire. Therefore, common mode inductors can improve the anti-interference performance of the power supply and reduce signal distortion and noise.

Differential mode inductors are commonly used for transmission and processing of differential mode signals. Differential mode signal refers to the same reverse signal that exists on two power lines at the same time. Differential mode inductors are usually placed between two power lines, and the signals on the two power lines generate differential mode signals based on the coupling of the differential mode inductors. Differential mode inductance can help circuits improve anti-interference, improve transmission quality, and ensure circuit stability.

In addition, although both common mode and differential mode inductors are inductive components, their functions and application fields are different. Common mode inductors are mainly used to suppress common mode interference, while differential mode inductors are mainly used for transmission and processing of differential mode signals.