Aristo Stampings

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 X_L is used in complement with an active semiconductor device to maintain very accurate voltage control.

An inductor coil is typically has a relatively simple two-terminal winding over a magnetic core. its used in LED Drivers, SMPS Supply etc.

An inductor is usually constructed as a coil of conducting material, typically copper wire, wrapped around a core either of air or of ferromagnetic or ferromagnetic material. Core materials with a higher permeability than that of air increase the magnetic field and confine it closely to the inductor, thereby increasing the inductance. Low frequency inductors are constructed like transformers, with cores of electrical steel laminated to prevent eddy currents. 'Soft' ferrites are widely used for cores above audio frequencies, since they do not cause the large energy losses at high frequencies that ordinary iron alloys do. Inductors come in many shapes. Most are constructed as enamel coated wire (magnet wire) wrapped around a ferrite bobbin with wire exposed on the outside, while some enclose the wire completely in ferrite and are referred to as "shielded". Some inductors have an adjustable core, which enables changing of the inductance. Inductors used to block very high frequencies are sometimes made by stringing a ferrite cylinder or bead on a wire.

At high frequencies, particularly radio frequencies (RF), inductors have higher resistance and other losses. In addition to causing power loss, inresonant circuits this can reduce the Q factor of the circuit, broadening the bandwidth. In RF inductors, which are mostly air core types,

Toroidal inductors with a round core cross section are better performers than toroidal inductors with a rectangular cross section. The cancellation is more complete for the round cross section. The round cross section also gives a shorter turn length per unit of cross sectional area, hence lower winding resistances. Good turn-to-turn coupling is dependent on the winding being wound a full 360 degrees around the core. As winding turns are positioned further away from the core less complete turn-to-turn coupling will occur. Turns on the outer layers see a core cross sectional area that includes some non-magnetic area (air, insulation, copper). This added area generates some leakage inductance that adds to the inductance expected from the core.

 

Toroidal inductor cores are available in many materials: silicon steel, nickel iron, moly-permalloy powder, iron powdered, amorphous, ferrites, and others. Silicon steel and nickel iron are available as tape wound cores or laminated pieces. Non-magnetic toroids are also available to make air core toroidal inductors.
 Toroidal inductors can be used in any inductor application that can accommodate its shape. Although usable, toroidal inductors are not always practical for some applications. Gapped toroidal inductors usually require that the gap be filled with some type of insulating material to facilitate the winding process. This is an extra expense. Powdered cores have an effective distributed gap. These are usually preferred over a filled gap because of lower cost and reduced gap losses. Some printed circuit boards are space critical. Mounting a toroidal inductor flat on the board may take up too much precious board area. Some applications also have restricted height so the toroidal inductor cannot be mounted vertically.

These are used for:

 

• Less power loss and minimum thermal effect to peripheral components.
• Perfectly matched to power supplies where average power and peak power differ greatly, with magnetic saturation kept minimum
• Low radiation noise

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An inductor (also choke, coil,) is a passive two-terminal electrical component that stores energy in its magnetic field. its use in electronic balast & Ecectronics circuits,

Some of the more popular applications are battery powered equipment, DC/DC converters, automotive components, and load testers. Agile Magnetics high current inductors are available in many different configurations and mounting options.