The magnetic ring of the magnetic ring inductor manufacturer and the connecting cable form an inductor (the wire in the cable is wound on the magnetic ring as an inductance coil). It is a commonly used anti-interference component in electronic circuits and is good for high-frequency noise. The shielding effect is called an absorbing magnetic ring. Because it is usually made of ferrite material, it is also called a ferrite magnetic ring (referred to as a magnetic ring).
In the figure, the upper part is an integrated magnetic ring, and the lower part is a magnetic ring with mounting clips. The magnetic ring has different impedance characteristics at different frequencies. Generally, the impedance is very small at low frequencies, and the impedance of the magnetic ring increases sharply when the signal frequency increases. It can be seen that the role of inductance is so great that everyone knows that the higher the signal frequency, the easier it is to radiate out. However, the general signal lines are not shielded. These signal lines become good antennas to receive the surrounding environment. A kind of messy high-frequency signals, and these signals are superimposed on the original transmission signal, and even change the original transmission useful signal, which seriously interferes with the normal operation of electronic equipment. Therefore, reducing the electromagnetic interference (EM) of electronic equipment has already been considered. problem. Under the action of the magnetic ring, even if the normally useful signal passes smoothly, the high-frequency interference signal can be well suppressed, and the cost is low.
MD magnetic ring inductance introduced, the role of inductance also has important functions such as screening signals, filtering noise, stabilizing current and suppressing electromagnetic wave interference.
Second, the classification of inductance.
Classified by working frequency:
Inductance can be divided into high frequency inductance, medium frequency inductance and low frequency inductance according to the operating frequency.
Air core inductors, magnetic core inductors and copper core inductors are generally medium frequency or high frequency inductors, while iron core inductors are mostly low frequency inductors.
Classified by the role of inductance:
According to the function of inductance, inductance can be divided into oscillation inductance, correction inductance, kinescope deflection inductance, blocking inductance, filter inductance, isolation inductance, compensated inductance, etc.
Oscillation inductance is divided into TV line oscillation coil, east-west pincushion correction coil and so on.
The deflection inductance of the picture tube is divided into a line deflection coil and a field deflection coil.
The choke inductor (also called choke) is divided into high frequency choke, low frequency choke, choke for electronic ballast, TV line frequency choke and TV airport frequency choke, etc.
Filter inductance is divided into power supply (power frequency) filter inductance and high frequency filter inductance, etc.
Post time: Jul-22-2021
