An inductor is a passive electronic component that can store electrical energy in the form of magnetic flux. It is usually in the form of a coiled wire, and when current flows through it, a magnetic field is generated from the right side of the current flow direction.
Alternating current refers to current whose magnitude and direction change periodically over time. When alternating current passes through an inductor, the magnetic field generated by the current cuts off the other windings, thus generating a reverse voltage, which hinders the change of current. In particular, when the current increases suddenly, an electromotive force in the opposite direction of the current, that is, in the direction of current reduction, is generated to hinder the increase of current. Conversely, when the current decreases, it is generated in the direction of current increase.

If the direction of the current is reversed, a reverse voltage will also be generated. Before the current is blocked by the reverse voltage, the current flow direction will be reversed, so the current cannot flow.

On the other hand, since the current does not change, direct current will not generate a reverse voltage and there is no risk of short circuit. In other words, an inductor is a component that allows direct current to pass, but not alternating current.

Basic application principle of inductance

Alternating current will generate magnetic field, and the changing magnetic field will induce current. The linear relationship ratio is called inductance.

However, inductance has the function of storing and releasing energy through the mutual conversion of electromagnetic and magnetic fields. Ideal inductance does not generate or consume energy.

Therefore, inductance can be used as a component for stabilizing current or as a component for phase matching; of course, the uses of inductance are more varied, such as filtering, energy storage, energy release, resonance, bypass... and so on.

All of the above are ideal inductances; but in the real world, it is impossible to produce a completely ideal inductance; in passive components, whether it is resistance, capacitance or inductance, the characteristics they exhibit are only the items with stronger contributions within a certain frequency range in their equivalent circuits.

Principle of inductor components

• Inductors are energy storage components that store energy in the form of magnetic fields

• Inserting magnetic materials into hollow coils greatly enhances the magnetic field inside the coils

For example: inserting Y material (μ value = 100) will increase the inductance by a hundred times

; inserting HU material (μ value 10000) will increase the inductance by 10,000 times