With the advent of technology in this world, the protection of signal transmission cannot be ignored. This is where the common mode choke comes in, as it is essential in reducing electromagnetic interference (EMI) and improving the electromagnetic compatibility (EMC) performance.
Common mode chokes (also known as common mode inductors) are specially designed to eliminate unwanted noise interference on the high-speed data signal lines. The core is closed and symmetrical windings are used so that such components can control common mode noise but let differential mode signals through. Therefore, even in disturbance in the presence of an electromagnetic field, the clarity of data transmission is maintained.
In anticipation of interference or noise, there exist two types current in a circuit. One is differential mode current which is typically the desired signal that goes through the circuit in the opposite direction from one another, and the two undesirable noise signals that can be considered to be common mode currents both going in the same direction on both conductors. Common mode chokes are a special type of device effective for common mode current suppression only with no influence on differential mode currents.
As common mode currents flow through the common mode choke windings, a magnetic field that is opposite in direction occurs in the magnetic core. These magnetic fields cancel each other out and as a result, there is an extreme reduction in common mode currents. At the same time, opposite phase differential mode currents generate magnetic fields that support the flow rather than other phase which can pass through the choke undisturbed.
Irrespective of designing a power supply or working on USB and Ethernet communication interfaces, there is a substantial gain when designing the units with high specification common mode chokes. Such a process of designing will reduce the EMI and increase the EMC compliance thus ensuring a better and more fault free electronic environment for the device under use.
In conclusion, investing in good quality common mode chokes will go a long away in increasing the performance and reliability of an individual's electronic system. Most electronics will always encounter signals that are obtrusive and these components are essential in filtering the undesirable noise and disruption and thus conserve transmission clarity while also maintaining the florescen standards of EMC.