Function of inductance coil in circuit

Function of inductance coil in circuit

Basic functions: filtering, oscillation, delay, notch, etc

Image saying: "connect DC, block AC" says: "block DC"

On DC: the so-called on DC refers to the DC circuit, the role of inductance is equivalent to a wire, does not play any role.

Resistance to AC: in AC circuit, inductance will have impedance, that is, XL, the current of the whole circuit will be smaller, which has a certain blocking effect on AC.

In the electronic circuit, the inductance coil has a limited current effect on the AC. it and the resistor or capacitor can form a high pass or low pass filter, a phase-shifting circuit and a resonance circuit;

The function of inductance is to block the change of current, but it is different from that of resistance.

The function of resistance blocking current is marked by the consumption of electric energy, while the change of inductance blocking current is purely to keep the current unchanged. When the current increases, the inductance blocking current increases, and when the current decreases, the inductance blocking current decreases. The process of inductance blocking current change does not consume electric energy. When the blocking current increases, it temporarily stores the electric energy in the form of magnetic field. When the current decreases, it also releases the energy of magnetic field. As a result, it blocks the change of current.

Function of common mode inductor: common mode inductor, also known as common mode choke, is used to filter common mode EMI signal in switching power supply. In the board design, the common mode inductor also plays the role of EMI (electro magnetic interference) filtering, which is used to suppress the electromagnetic wave generated by the high-speed signal line to radiate outward. The chip of switching power supply is not only an EMI object, but also an EMI source. Generally speaking, we can divide these electromagnetic interference into two categories: series mode interference (differential mode interference) and common mode interference (grounding interference). Take the two PCB wires on the main board (the wires connecting the components of the main board) as an example. The so-called serial mode interference refers to the interference between the two wires, while the common mode interference refers to the interference caused by the potential difference between the two wires and the PCB ground wire

The function of I-inductor: small volume, easy to install, small space; high Q value factor; small distributed capacitance; high self resonance frequency; special guide pin structure, not easy to produce closed-circuit phenomenon. I-inductor is the ratio of alternating flux generated around the inner part of the conductor when the conductor passes through the alternating current. I-inductor Generally used for circuit matching and signal quality control, generally for connection and power supply connection. The stability of I-inductor is higher than that of general inductors. The current used in the circuit is relatively stable, and the efficiency is also improved a lot. The main functions of I-inductor are to screen signals, filter noise, stabilize current and control electromagnetic interference.

The function of color ring inductor: screening signal, filtering noise, stabilizing current and restraining electromagnetic interference. The basic function of the color ring inductor is to charge and discharge. It has the effect of moisture-proof. Because of its small power, it is suitable for small volume and small power products.

Function of power inductor: choke, filter, oscillation. Mainly suitable for high-power power supply.

For more information,please contact us at sales@xfullstar.com