7/30/2019 Inductor Animate

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Coils can store electrical energy in a form of magnetic energy using theproperty that an electric current flowing through a coil produces amagnetic field, which in turn produces an electric current. In otherwords, coils offer a means of storing energy on the basis of inductivity(reactive magnetic flux).

Voltage regulating converters are stabilized when used in combinationwith inductors that can store magnetic energy,capacitors that can store electric energy, and a switch.

“Choke” means

to “clog up”the flow of an alternating

electric current.

Basic principle of choke-coils

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Inductor's World

06

Inductor's World

E l   e c  t r i   c 

 s i   gn al   s 

“Pass”Zero frequency, that is,direct current isallowed to pass.

“Braking”The voltage of the passingsignals decreases withincreasing frequencies.

“Signal stopped”The voltage approaches zeroat further higher frequencies,finally stopping the signals.

Low-pass filter High-pass filter

Inductors can be used in combination with capacitors, which

complement the function of inductors, to form LC filters that canseparate the required signals from unwanted ones.

Function of coils depends on signal frequencies.

This is because the higher the frequency,the less easily the signal flows.

High-frequencysignals areremoved whenthey passthrough thecapacitor.

Low-frequencysignals pass throughthe filter (low-pass)and are sent to theoutput.

Low-frequencysignals areremoved whenthey passthrough theinductor.

High-frequencysignals pass throughthe capacitor (highpass) and are sent tothe output.

OutputInput OutputInput

Noise

<“Turned-ON” state>An electric current flows in the circuit,and energy is stored in the inductor(charging).

<“Turned-OFF” state>The energy stored in the capacitor is consumed(discharging), and the capacitor, in turn,stores energy and releases it.

Directcurrent

Diode

Semiconductor switching

(current is turned ON andOFF at a high speed)

As soon as the current is turned off,

the inductor produces magneticfluxes and releases the stored energy.

DC-DC converter (voltage step-down type)

Inductor(choke-coil)

Switching controls causethe output voltage to change

(basic principle ofDC-DC converters).

Capacitor

Coils can control signals………………………………………………Noise is eliminated,or only the desired signals are allowed to pass.

Coils can store energy………………………………………………… Voltage is stabilized.

Inductors can be roughly divided into two types according to their function.One is to control signals, and the other is to store electrical energy.Function of inductors

Reactive magnetic fluxes aregenerated in the coil to counteractthe changes in electric current.

Energy is stored in the coil becauseof the reactive magnetic fluxagainst the alternating current.

Low-pass filtersare also used to

remove high-frequencynoise.