What is Choke Coil? Types, Application, Properties, Diagram


In both electrical and electronics engineering, the term 'Choke Coil' is very well known to us. But, have you know, exactly what is a choke coil? or what is the exact function of a choke coil. In this article, we are going to know all about a choke coil including its types, properties, applications, and uses.


What is Choke Coil?


A choke coil is nothing but an inductive coil whose main function is to block the high-frequency signals or current and allow the low frequency alternating or DC current. The name or term 'choke' comes from the term 'Choking' whose other meaning is blocking. Generally, the choke coil is made up of a coil of insulated wire and the coil is wound on a magnetic core made of ferromagnetic material.


Choke Coil Diagram and Different Parts


Here, you can see a simple diagram of a choke coil and its different parts.

Choke Coil Diagram





Properties of a Choke Coil


1. The internal resistance of the choke coil is very low.

2. The inductive reactance of the choke coil varies with the varying of frequency of the flowing current through it.

3. When the frequency is increasing, the inductive reactance also increases, and when the frequency decreases the inductive reactance also decreases.

4. As the inductive reactance varies with the varying of frequency, so impedance provided by a choke coil to the flow of alternating current also varying with the frequency.

5. The main function or property of a choke coil is to allow the Direct current or low-frequency Alternating Current and to block the high-frequency Alternating Current.

6. A Choke coil opposes the flow of electric current by its reactance property, not resistance property. So there is an advantage is that it does cause any power loss.

7. As the choke coil is basically an inductor or inductive coil, so it can store the electric energy in form of a magnetic field.

8. A continuously varying current-carrying choke coil can produce Electromagnetic Interference(EMI).




Types of Choke Coil


Choke coils are classified according to design, voltage rating, inductance ratings, application areas, etc. The different types of choke coil are,
  • Common Mode Choke Coil
  • Audio Frequency Choke Coil
  • Radio Frequency Choke Coil


What is Common Mode Choke Coil?


A common mode choke coil is that which allows the differential current with an equal quantity flowing in opposite directions also it blocks the common-mode current. A common mode choke coil is designed in such a way that two coils are wound on a single core with the opposite direction of the rotation. Here you can see the diagram of a common mode choke.




What is Audio Frequency Choke Coil?


Audio Frequency Choke Coil are those blocks the normal power line frequencies and audio frequency signals but they allow to pass the DC current. Generally, the audio frequency choke coils are designed with a coil wound on a ferromagnetic core. This helps to increase its inductive property.



What is Radio Frequency Choke Coil?


Radio Frequency Choke coils are those block the radio frequency signals and allow the other signals such as audio frequency signals, normal power frequency signals, and DC signals. Radio Frequency Choke coils are made up of a coil wound on a core of iron powder or ferrite materials. Generally, radiofrequency choke coils are designed for ultra-high frequency applications.




Choke Coil Applications and Uses


1. Choke coils are used in electronic circuits to reduce Electromagnetic Interference.

2. Choke coil is used with fluorescent tube light to produce a high voltage at the starting time.

3. Choke coils are used with sensitive cables and connectors such as USB Data cables, HDMI cables, etc to reduce noise and interferences.

4. Audio frequency choke coils are used in audio systems, subwoofers, etc.

5. Choke coils are also used in power supply circuits such as voltage regulators, rectifier circuits, inverter circuits, etc.


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What is Choke Coil? Types, Application, Properties, Diagram What is Choke Coil? Types, Application, Properties, Diagram Reviewed by Author on 8/26/2021 Rating: 5
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