What are the differences between common mode inductance and differential mode inductance?
The difference between common mode inductance and differential mode inductance:
1. The difference mode current generated between the line and the line of the interfering electromagnetic field causes interference on the load, which is called difference mode interference;The interference electromagnetic field generates common mode current between the line and the ground, and the common mode current generates differential mode voltage on the load, causing interference, which is the common mode interference in the ground loop.
2. The filter inductance to suppress common-mode interference is called common-mode inductance;The filter inductance that inhibits differential mode interference is called differential mode inductance.
3. Common mode inductance is bi-directional;The differential mode inductance is unidirectional.
4. The common-mode inductance is two groups of coils with the same number of turns, the same wire diameter and the opposite direction around the same iron core;Differential mode inductance is a coil wound around an iron core.
5, common-mode inductance is two windings are connected to the zero line and the fire line, two windings with the same in and out, filter is the common-mode signal;A differential mode inductor is a winding, and a filter inductor connected separately to a null or live wire can only filter out differential mode interference.
6. Common-mode signal: two identical signals on the zero line and the fire line respectively, which form a loop through coupling and ground;Differential mode signal: is the same circuit as the useful signal.
7, the characteristics of the common mode inductance is: because of the same iron core on the two groups of coils around the opposite, so the core is not afraid of saturation.The most widely used core material in the market is high-conductivity ferrite material.Differential mode inductance is characterized by its application to high current applications.Since only one coil is wound around the iron core, when the current flowing into the coil increases, the iron core in the coil will be saturated, so the most commonly used iron core material in the market is metal powder core material.
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