Shenzhen DCH Electronic Co., Ltd.
Main products:plastic,metal,cable assembly
Contact Us
  • Contact Person : Mr. LEUNG Michael
  • Company Name : Shenzhen DCH Electronic Co., Ltd.
  • Tel : 86-0755-29104739
  • Fax : 86-0755-29063493
  • Address : Guangdong,SHENZHEN,(4/F, Bldg. C), Block B, C, D, Jingfu Industrial Park, Hangkong Rd. (W), Gushu, Xixiang, Bao'an District
  • Country/Region : China
  • Zip : 518000

Antenna inductance coil, oscillation inductance coil, choke inductor, trap inductance coil, deflection inductance coil

Antenna inductance coil, oscillation inductance coil, choke inductor, trap inductance coil, deflection inductance coil
Product Detailed
1) Compact and low profile 2) Choke coils filters 3) Low DC resistance 4) High current rating 5) 10uH-100mH RoHs Complia

An inductor (also choke, coil or reactor) is a passive two-terminal electrical component that stores energy in its magnetic field. For comparison, a capacitor stores energy in an electric field, and a resistor does not store energy but rather dissipates energy as heat.

Any conductor has inductance. An inductor is typically made of a wire or other conductor wound into a coil, to increase the magnetic field.

When the current flowing through an inductor changes, creating a time-varying magnetic field inside the coil, a voltage is induced, according to Faraday's law of electromagnetic induction, which by Lenz's law opposes the change in current that created it. Inductors are one of the basic components used in electronics where current and voltage change with time, due to the ability of inductors to delay and reshape alternating currents.


Ideal and real inductors

An "ideal inductor" has inductance, but no resistance or capacitance, and does not dissipate or radiate energy. However real inductors have resistance (due to the resistance of the wire and losses in core material), and parasitic capacitance (due to the electric field between the turns of wire which are at slightly different potentials). At high frequencies the capacitance begins to affect the inductor's behavior; at some frequency, real inductors behave as resonant circuits, becoming self-resonant. Above the resonant frequency the capacitive reactancebecomes the dominant part of the impedance. Energy is dissipated by the resistance of the wire, and by any losses in the magnetic core due to hysteresis. At high currents, iron core inductors also show gradual departure from ideal behavior due to nonlinearity caused by magnetic saturation. At higher frequencies, resistance and resistive losses in inductors grow due toskin effect in the inductor's winding wires. Core losses also contribute to inductor losses at higher frequencies. Practical inductors work as antennas, radiating a part of energy processed into surrounding space and circuits, and accepting electromagnetic emissions from other circuits, taking part in electromagnetic interference. Circuits and materials close to the inductor will have near-field coupling to the inductor's magnetic field, which may cause additional energy loss. Real-world inductor applications may consider the parasitic parameters as important as the inductance.



Inductors are used extensively in analog circuits and signal processing. Inductors in conjunction with capacitors and other components form tuned circuits which can emphasize or filter out specific signal frequencies. Applications range from the use of large inductors in power supplies, which in conjunction with filter capacitors remove residual hums known as the mains hum or other fluctuations from the direct current output, to the small inductance of the ferrite bead or torus installed around a cable to prevent radio frequency interference from being transmitted down the wire. Smaller inductor/capacitor combinations provide tuned circuits used in radio reception and broadcasting, for instance.

Two (or more) inductors that have coupled magnetic flux form a transformer, which is a fundamental component of every electric utility power grid. The efficiency of a transformer may decrease as the frequency increases due to eddy currents in the core material and skin effect on the windings. The size of the core can be decreased at higher frequencies and, for this reason, aircraft use 400 hertz alternating current rather than the usual 50 or 60 hertz, allowing a great saving in weight from the use of smaller transformers.[1] The principle of coupled magnetic fluxes between a stationary and a rotating inductor coil is also used to produce mechanical torque in induction motors, which are widely used in appliances and industry. The energy efficiency of induction motors is greatly influenced by the conductivity of the winding material. For more information about the conductivity of the winding material, see: Copper in energy efficient motors#Electrical conductivity in motor coils.

An inductor is used as the energy storage device in some switched-mode power supplies. The inductor is energized for a specific fraction of the regulator's switching frequency, and de-energized for the remainder of the cycle. This energy transfer ratio determines the input-voltage to output-voltage ratio. This XL is used in complement with an active semiconductor device to maintain very accurate voltage control.

Inductors are also employed in electrical transmission systems, where they are used to depress voltages from lightning strikes and to limit switching currents and fault current. In this field, they are more commonly referred to as reactors.

Larger value inductors may be simulated by use of gyrator circuits.


Applications of our common mode filter:

Driver transformer in resonance transformers switchingPulse identity and transmissionSaturation ferrite core transformerDesign with minimized height for electronic

The mechanical dimensions and electrical specifications can be designed according to customer's requirements.





1) Compact fluorescent lamp 2) Television receiver 3) Radio cassette player 4) PC power supply 5) Monitor,audio,VCD,DCD 6) UPS 7) The electronic apparatus

8) The noise rejection 9) Induction cooker,etc.


• High current capacity • Low core loss at frequency • High reliability, efficiency • Small packaged size

• Operating Temperature: -30°C to +80°C

• Electrical Specifications at 20°C


1.The product contain no lead and also support lead-free.

2.This type is the best for energy-saving in the low DC resistance.

3.Core material :MnZN

4.Inductance: 20uH.

5.Low distortion at the time large output by high DC current.

6.Adopts the high quality and imported copper wire, the copper wire could endure high temperature.

7.Turns: 16T

8.Outer diameter: 25mm, Heigth: 14mm


1.Strict and responsible quality control department, so we could ensure about the quality.

2.The current can be as high as 20A

3.The inductance can be as high as 20mH

4.High energy saving, low resistance.

5.We have successfully exported to Russia, Malaysia, HK, Czech Republic, America, Australia, Belgium and Singapore and UK and other countries, we have win good praise in consumers due to the high quality, good service, low price and short delivery time.

Environmental data:

1.Storage temperature: -40 °c to +125°c

2.Working temperature: -40 °c to +125 °c


Mainly used for Solar applications, DC-DC converter, and solar energy in DC-DC converter,LED the driver, backlighting devices, charger, car audio .

Be able to design and manufacture under customer's special request.

Mainly exported to Asia, America, Oceania and Europe.


Antenna inductance coil, oscillation inductance coil, choke inductor, trap inductance coil, deflection inductance coil

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