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Choke Coils

A reliable source for Choke Coils information and leading Choke Coils Companies & Manufacturers.

A choke coil is an inductive coil that blocks alternating currents of a higher frequency while passing direct and alternating currents of lower frequencies in an electrical circuit. Read More…

Choke Coils Choke coils, also known as choking coils, are low-resistance electrical coils with high inductance that are used to block high-frequency alternating currents (AC) of electricity while allowing low-frequency direct currents (DC) to pass through.
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Leading Manufacturers

Sag Harbor, NY  |  800-724-5952

We are proud of the craftsmanship of our engineers. All of our products are made right here in the United States and we promise that these items are created from high quality resources. Our electrical coils are unique and efficient.

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Sag Harbor Industries, Inc. $$$

Bristol, CT  |  800-825-4319

Established in 1973, Classic Coil Company is a Contract Manufacturer of electronic coils. We manufacture coils for a variety of industries; winding wire gauges from 4-58 AWG. We are ISO 9001-2015 certified, ITAR registered and DFARS Compliant. Our Engineering services allow us to assist with design, reduce cost, and increase efficiency in production. Call or visit our website to learn more about our capabilities.

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Classic Coil Company $$$

Bristol, CT  |  860-584-0927

We are an ISO 9001:2015 certified company which is internationally known for manufacturing high quality electromagnetic-coils. It is our goal to provide quality products, a commitment to speedy delivery, and competitive pricing. We understand that every application is unique, so we encourage you to contact us to discuss your specific requirements. Call us at 1-860-584-0927 and find out what our 50+ years of experience can do for you.

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Quality Coils, Inc. $$$

Alpha, NJ  |  800-867-3526

Since 1962, Torelco has been a supplier of electric coils and transformers of superior quality. We offer custom coils, solenoid coils, ferrite core coils & toroid wound coils to serve a range of industries. Markets served include medical, military, electronics, and industrial. When you work with us, our promise is to build to the exact specifications and meet the custom needs of our customers.

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Torelco LLC $$$

North Fort Myers, FL  |  239-997-3860

Check out what’s new online at Precision Econowind, manufacturer of the highest quality custom coils at reasonable prices, with on time delivery. Serving the coil industry for over 30 years, we’re experienced with producing loudspeaker & medical industry coils, coils wound on customers’ bobbins/tooling; freestanding, flat wire, edge wound, square, rectangle & shaped coils. Submit your specs today!

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Precision Econowind, Inc. $$$

Perris, CA  |  951-277-0757

Triad Magnetics has been in the electric coils industry for over 75 years. Giving us the knowledge and expertise to be one of the best in the industry. We have a wide range of electric coils and inductors as well as the ability to custom engineer and manufacture electric coils to our customer’s needs. Having served the needs of many industries for more than half a century, Triad believes its experience makes the difference.

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Triad Magnetics $$$

Antigo, WI  |  800-826-9741

Johnson Electric Coil Company is a family owned manufacturer that specializes in custom transformers, coils and inductors. From three phase isolation transformers to single phase inductors and chokes, we carefully design our products to meet your exact specifications.

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Johnson Electric Coil Company $$$
placeholder image Sag Harbor Industries, Inc. Classic Coil Company Quality Coils, Inc. Torelco LLC Precision Econowind, Inc. Triad Magnetics Johnson Electric Coil Company

What Is a Choke Coil?

A choke coil is an inductive coil that blocks alternating currents of a higher frequency while passing direct and alternating currents of lower frequencies in an electrical circuit.

A choke coil usually has a coil of insulated wire wound on a magnetic core. Other chokes contain a bead of donut-shaped ferrite material strung on a wire.

Choke Coil

The impedance of the choke increases with the frequency. Its low electrical resistance passes direct current and alternating current with little power loss, although its reactance limits the amount of alternating current passed.

How Choke Coils Function

The main idea in sending the signal through a circuit is to let the wanted signal go through while simultaneously filtering out the unwanted signals. The choke coil is the best fit because it works as an inductor.

When the current passes through changes, as the alternating current does, it creates a magnetic field in that coil that works against the current. This property is known as inductance and blocks almost all the alternating current from passing through.

Currents such as direct currents, which do not change, can continue through, while those that do change are blocked by the magnetic field they would have created on their own. A material used to produce a magnetic field is at the core of this part.

An air core or a ferrite core can be used in coils that filter higher frequencies, while an iron core can be used for those that filter low frequencies. The coil's rate of inductance and the magnetic field's strength are determined by the material used in the core.

A choke coil keeps the electric charge in the magnetic field created around it.

Types of Choke Coils

Choke coils are grouped according to their application areas, ratings in inductance, voltage rating, and design.

Audio Frequency Choke Coil

This type of choke coil usually has ferromagnetic cores, which help to increase their inductance. They are usually constructed in a way similar to that of transformers, with laminated iron cores and an air gap.

The iron core does the work of increasing the inductance for a given volume of the core. Choke coils were usually used in rectifier power supplies for vacuum tube equipment, including radio receivers or amplifiers.

Audio Frequency Choke Coil

Chokes are commonly found in direct current motor controllers to produce direct current. They were used in collaboration with large electrolytic capacitors to remove the voltage ripple at the output DC.

A rectifier circuit designed for a choke output filter may produce a lot of DC output voltage and expose the rectifier and the filter capacitors to excessive in-rush and ripple currents if the conductor is removed.

Radio Frequency Choke Coil

These audio frequency chokes usually contain iron powder or ferrite cores, which help increment the inductance and overall operation.

They are usually wound in complex patterns to reduce self-capacitance and losses of proximity effect.

Radio Frequency Choke Coil

Choke coils for even higher frequencies have low inductance and non-magnetic cores. The ferrite bead is an example of a modern choke used to eliminate digital RF noise from lines. These are often seen on computer cables, and an RF choke value can be 2 mill henries.

Common Mode Choke Coil

This type of choke coil has a case where two coils are wound on a single core. It is useful for compression of electromagnetic interference and radio frequency interference from power supply lines and also for preventing the malfunction of power electronic devices. The choke passes differential currents at the same time blocking common mode currents.

Common Mode Choke Coil

The differential mode currents produce a magnetic flux, which tends to cancel out since the windings are negatively coupled.

Therefore, the chokes result in nominal impedance of inductance to DM currents, whereas CM currents are presented at high impedance because of the combined inductance of the positive coupled windings.

Applications and Uses

Choke coils are used for the reduction of electromagnetic interference in electronic circuits. High voltage at the starting time can be produced as choke coils are used with fluorescent tube light. To reduce noise and other interferences, choke coils are used in conjunction with sensitive cables and connectors such as USB data cables and HDMI cables.

Audio frequency choke coils are used in subwoofers and other audio systems. These choke coils are also used in power supply circuits such as inverter circuits, voltage regulators, and rectifier circuits.

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