Inductors are passive two-terminal electrical components that store energy in a magnetic field, when electric current flows through them. They generally consist of an insulated wire wound into a coil, around a core. Common mode chokes work as passive electronic inductors that filter out frequencies. High frequencies are specifically eliminated, while allowing low frequencies in an electronic system. With such properties, they have proven to be really helpful when used in electrical transformers.
Design
Common mode chokes are designed with one magnetic or ferromagnetic core, and two wire windings in the shape of toroidal inductors. The two windings are identical, with the only difference being that they are wound in opposite directions. The choke can be big or small, with no set number of windings; but the primary coil delivers current from the AC mains and the secondary winding. This creates balance by cancelling out the flux from the primary coil. When using common mode current for various circuits, the choke blocks out the noise in the AC mains.
Why the name?
You may wonder, why the name “common mode” chokes. The reason here is that chokes are present n both the neutral and mains. Now that you have understood what a common mode choke is – its construction and working – let us help you find the right choke for your application.
Finding the right choke
It is very important to find the right common mode choke; and in order to do so, you must be aware of the suppression level required for the common mode noise. one technique for achieving maximum efficiency is by choosing the lowest frequency for common mode noise suppression. To resist the noise without affecting the signal, high impedance is applied at unwanted frequencies. Unwanted noise is cancelled when there is equal signal cancellation in the common choke mode.
The best choke useful for filtering out unwanted electromagnetic interference currents without causing signal degradation work well with filtering out undesirable frequencies in power lines. Common mode chokes can also be used to generate radio frequency interference in networks that don’t use an unshielded twisted pair cable. The overall effect is zero impedance, which is formed as a result of short signals to ground potential.
Why Miracle Electronics?
If you have decided on buying common mode chokes for your application, you can do so at Miracle Electronics. We are the best inductor and transformer manufacturers in India, who offer both common mode and differential mode chokes. While common mode chokes are effective to filter supply and return conductors with in-phase signals of equal amplitude, differential mode inductors help in filtering out-of-phase or uneven amplitude signals. Miracle Electronics’ inductor style common mode chokes are designed to provide the highest common mode impedance over the widest frequency range. They are more efficient at producing the needed inductances. And, every inductor provided here is RoHS and REACH compliant. So, make sure you get all your transformers and inductors here.