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The role of inductance coils in various fields

發布時間:2021-05-06


The role of inductance coils in various fields


For the role of inductance coil, the following Youhui winding machine to tell you about


The first is the basic role of inductance coil: wave storage, oscillation, delay, notch, etc.


The use of a more vivid statement that is: "DC, AC resistance"


The following Youhui machinery to do a detailed explanation:


The first is in the electronic circuit;

The inductance coil acts on the AC finite current, and it forms a high-pass or low-pass wave recorder, phase shifter circuit and resonant circuit with a resistor or capacitor.

Transformers can carry out AC coupling, variable voltage, AC and impedance conversion, etc.

Here's what inductance does


First, the blocking effect:


The self-induced electromotive force in the coil is always opposed to the current variation in the coil.

It can be divided into high frequency choke coil and low frequency choke coil.


Two, tuning and frequency selection:


The inductance coil in parallel with the capacitor can form the LC tuning circuit.

That is, the natural oscillation frequency F0 of the circuit is equal to the frequency F of the non-AC signal, so the inductive and capacitive reactance of the circuit are equal, so the electromagnetic energy oscillates back and forth between the inductor and the capacitor, which is the resonance phenomenon of the LC circuit.

When resonant, the inductive reactance and the capacitive reactance of the circuit are equivalent and reverse, so the inductive reactance of the total current of the circuit is the smallest and the current flow is the largest (referring to the AC signal of F = F0). Therefore, LC resonant circuit has the function of selecting the frequency and can select the AC signal of a certain frequency F.


1, high frequency choke coil: high frequency choke coil, also known as high frequency choke coil, it is used to prevent high frequency AC current through.


High frequency blocking coil works in high frequency circuit, often adopts hollow or ferrite high frequency core, the skeleton is made of ceramic material or plastic, the coil adopts honeycomb type segment winding or multilayer flat winding segment winding.


2, low frequency choke coil: low frequency choke coil, also known as the low frequency choke coil, it is applied to current circuit, audio circuit or field output circuit, its role is to prevent the low frequency AC current through.


Usually, low frequency choke coils used in audio circuits are called audio choke coils, low frequency choke coils used in field output circuits are called field choke coils, and low frequency choke coils used in current filtering circuits are called filter choke coils.


Low-frequency choke coils generally use "E" shaped silicon steel sheet core (commonly known as silicon steel sheet core), permalloy core or iron oxide core.

In order to prevent magnetic saturation caused by a large direct current, appropriate gaps should be left in the core during installation.

Hollow core inductors, core inductors and copper core inductors are generally medium or high frequency inductors, while iron-core inductors are mostly low frequency inductors.

The quality factor of inductor is related to the DC resistance of the coil wire, the dielectric loss of the coil frame and the loss caused by the core and the shielding cover.


In a word;

At low frequency, the inductor generally presents inductance characteristics, which only store energy and filter the characteristics of high frequency.

At the same time, its impedance characteristics are obvious at high frequencies.

There are energy dissipation fever, perceptual effect reduction and other phenomena.

Different inductors have different high frequency characteristics.

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