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Choke (electronics)

 

 
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Choke (electronics)
 
 
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A choke is an inductor
Inductor

An inductor is a Passive component Electronic component that can store energy in a magnetic field created by the electric current passing through it....
 designed to have a high reactance to a particular frequency when used in a signal-carrying circuit.
e coils are inductances that isolate AC
AC

AC may refer to any of the following, broken down by subject area.Science* Actinium , a chemical element* Acetaldehyde , an organic ion...
 frequency currents from certain areas of a radio circuit. Chokes depend upon the property of self-inductance for their operation. They are used to block alternating current
Alternating current

In alternating current the movement of electric charge periodically reverses direction. An electric charge would for instance move forward, then backward, then forward, then backward, over and over again....
 while passing direct current
Direct current

Direct current is the unidirectional flow of electric charge. Direct current is produced by such sources as battery , thermocouples, solar cells, and commutator-type electric machines of the dynamo type....
 (contrast with capacitor
Capacitor

A capacitor or condenser is a Passive component electronic component consisting of a pair of electrical conductor separated by a dielectric....
). Common-mode choke coils are useful in a wide range of prevention of electromagnetic interference
Electromagnetic interference

Electromagnetic interference is an unwanted disturbance that affects an electrical circuit due to either electromagnetic conduction or electromagnetic radiation emitted from an external source....
 (EMI) and radio frequency interference (RFI) from power supply
Power supply

Power supply is a reference to a source of electrical power. A device or system that supplies electrical or other types of energy to an output External electric load or group of loads is called a power supply unit or PSU....
 lines and for prevention of malfunctioning of electronic equipment.

es used in radio circuits are divided into two classes – those designed to be used with audio frequencies, and the others to be used with radio frequencies.






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Encyclopedia


A choke is an inductor
Inductor

An inductor is a Passive component Electronic component that can store energy in a magnetic field created by the electric current passing through it....
 designed to have a high reactance to a particular frequency when used in a signal-carrying circuit.

Description

Choke coils are inductances that isolate AC
AC

AC may refer to any of the following, broken down by subject area.Science* Actinium , a chemical element* Acetaldehyde , an organic ion...
 frequency currents from certain areas of a radio circuit. Chokes depend upon the property of self-inductance for their operation. They are used to block alternating current
Alternating current

In alternating current the movement of electric charge periodically reverses direction. An electric charge would for instance move forward, then backward, then forward, then backward, over and over again....
 while passing direct current
Direct current

Direct current is the unidirectional flow of electric charge. Direct current is produced by such sources as battery , thermocouples, solar cells, and commutator-type electric machines of the dynamo type....
 (contrast with capacitor
Capacitor

A capacitor or condenser is a Passive component electronic component consisting of a pair of electrical conductor separated by a dielectric....
). Common-mode choke coils are useful in a wide range of prevention of electromagnetic interference
Electromagnetic interference

Electromagnetic interference is an unwanted disturbance that affects an electrical circuit due to either electromagnetic conduction or electromagnetic radiation emitted from an external source....
 (EMI) and radio frequency interference (RFI) from power supply
Power supply

Power supply is a reference to a source of electrical power. A device or system that supplies electrical or other types of energy to an output External electric load or group of loads is called a power supply unit or PSU....
 lines and for prevention of malfunctioning of electronic equipment.

Types and construction

Chokes used in radio circuits are divided into two classes – those designed to be used with audio frequencies, and the others to be used with radio frequencies. Audio frequency
Audio frequency

An audio frequency , or audible frequency is characterized as a periodic vibration whose frequency is audible to the average human. While the range of frequencies that any individual can hear is largely related to environmental factors, the generally accepted standard range of audible frequencies is 20 to 20,000 hertz....
 coil
Coil

A coil is a series of wiktionary:loops. A coiled coil is a structure where the coil itself is in turn also looping....
s, usually called A.F. chokes, can have ferromagnetic iron
Iron

Iron is a chemical element with the symbol Fe and atomic number 26. Iron is a Group 8 element and period 4 element. Iron is lustrous and silvery in color....
 cores to increase their inductance. Chokes for higher frequencies (ferrite chokes or choke balun
Balun

File:Balun-twisted-pair-to-coaxial-hdr-0a.jpgA balun, , is a type of electrical transformer that can convert electrical Signalling s that are balanced line about ground to signals that are unbalanced line and vice versa....
s) have ferrite
Ferrite (magnet)

Ferrites are a class of chemical compounds with the Chemical formula AB2O4, where A and B represent various metal cations, usually including iron....
 cores. Chokes for even higher frequencies have air cores. Radio frequency
Radio frequency

Radio frequency is a frequency or rate of oscillation within the range of about 3 Hz to 300 GHz. This range corresponds to frequency of alternating current electrical signals used to produce and detect radio waves....
 coils, (R.F. chokes), usually don't have iron cores. In high power service so much heat would be produced in making and destroying the field in the core that the coil would burn up.

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