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What is the difference between common mode inductance and differential mode inductance?
Jul 01, 2018


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


The role of the magnetic ring: the magnetic ring has different impedance characteristics at different frequencies. Generally, the impedance is small at low frequencies, and the impedance of the magnetic ring rises sharply when the signal frequency increases. The normal and useful signal is passed well, and the high-frequency interference signal can be well suppressed. The magnetic loop inductor itself has a relatively high current, the inductance value can be relatively high, and the high requirements on the circuit itself can be achieved, so the magnetic loop inductor is relatively widely used. However, there are two kinds of inductances in the magnetic loop inductance. Many people are relatively fuzzy concepts. This is the differential mode inductance and the common mode inductance. What is the difference between them?


  1. The suppression of interference signals is different. Disturbing the electromagnetic field generates a differential mode current between the line and the line, causing interference on the load. This is differential mode interference; the disturbance electromagnetic field generates a common mode current between the line and the ground, and the common mode current generates a differential mode voltage on the load, causing interference. This is the common mode interference. The magnetic loop inductance that suppresses common mode interference is called common mode inductance, and the magnetic loop inductance that suppresses differential mode interference is called differential mode inductance.


  2, the production process is not the same. The common mode inductance is two sets of coils with the same number of turns around the same core, the same diameter of the wires, and the opposite directions. The differential mode inductor is a coil wound around a core.


  3. Different characteristics. The characteristic of the common mode inductor is that the core is not afraid of saturation because the two sets of coils on the same core are wound in opposite directions. The most widely used magnetic core material on the market is a high conductivity ferrite material. The differential mode inductor is characterized by its application in high current applications. Due to a coil wound around a core, when the current flowing into the coil increases, the core in the coil is saturated, so the most core material used in the market is metal powder core material, especially iron powder core material (due to price Cheap).


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