Application method of inductive magnetic ring| GETWELL

What is the method of using inductive magnetic ring? What is the difference between different inductor magnetic ring materials? Let's get to know it together.

Magnetic ring is a commonly used anti-interference component in electronic circuits, which has a good suppression effect on high-frequency noise, which is equivalent to a low-pass filter. It can better solve the problem of high-frequency interference suppression of power lines, signal lines and connectors, and has a series of advantages, such as easy to use, convenient, effective, small space and so on. Using ferrite anti-interference core to suppress electromagnetic interference (EMI) is an economical, simple and effective method. It has been widely used in computers and other civil electronic equipment.

Ferrite is a kind of ferrite which is prepared by using high conductivity magnetic materials to infiltrate one or more other magnesium, zinc, nickel and other metals at 2000 ℃. In the low frequency band, the anti-interference magnetic core shows a very low inductive impedance and does not affect the transmission of useful signals on the data line or signal line. In the high frequency band, starting from the 10MHz, the impedance increases, but the inductance component remains very small, but the resistive component increases rapidly. when there is high frequency energy passing through the magnetic material, the resistive component will convert these energy into thermal energy consumption. In this way, a low-pass filter is constructed, which can greatly attenuate the high-frequency noise signal, but the impedance to the low-frequency useful signal can be ignored and does not affect the normal operation of the circuit. .

How to use the magnetic ring of anti-interference inductance:

1. Put it directly on a power supply or a bunch of signal lines. In order to increase the interference and absorb energy, you can circle it several times over and over again.

2. The anti-jamming magnetic ring with mounting clip is suitable for compensated anti-jamming suppression.

3. It can be easily clamped on the power cord and signal line.

4. Flexible and reusable installation.

5. The self-contained card type is fixed, which does not affect the overall image of the equipment.

The difference between different Materials of Inductance Magnetic Ring

The color of the magnetic ring is generally natural-black, and the surface of the magnetic ring has fine particles, because most of them are used for anti-interference, so they are rarely painted green. Of course, a small part of it is also used to make inductors, and it is sprayed green in order to achieve better insulation and avoid hurting the enamelled wire as much as possible. The color itself has nothing to do with performance. Many users often ask, how to distinguish between high-frequency magnetic rings and low-frequency magnetic rings? Generally, the low-frequency magnetic ring is green and the high-frequency magnetic ring is natural.

It is generally expected that the permeability μ I and resistivity ρ are high, while the coercivity Hc and loss Pc are low. According to the different uses, there are different requirements for Curie temperature, temperature stability, permeability reduction coefficient and specific loss coefficient.

The main results are as follows:

(1) Manganese-zinc ferrites are divided into high permeability ferrites and high-frequency low-power ferrites (also known as power ferrites). The main characteristic of high permeability mn-Zn ferrite is very high permeability.

Generally speaking, materials with μ I ≥ 5000 are called high permeability materials, and μ I ≥ 12000 is generally required.

Mn-Zn high-frequency and low-power ferrite, also known as power ferrite, is used in power ferrite materials. the performance requirements are: high permeability (generally required μ I ≥ 2000), high Curie temperature, high apparent density, high saturation magnetic induction intensity and magnetic core loss at low frequency.

(2) Ni-Zn ferrite materials, in the low frequency range below 1MHz, the performance of NiZn ferrites is not as good as that of MnZn system, but above 1MHz, because of its high porosity and high resistivity, it is much better than MnZn system to become a good soft magnetic material in high frequency applications. The resistivity ρ is as high as 108 ω m and the high frequency loss is small, so it is especially suitable for high frequency 1MHz and 300MHz, and the Curie temperature of NiZn material is higher than MnZn,Bs and up to 0.5T 10A/m HC can be as small as 10A/m, so it is suitable for all kinds of inductors, transformers, filter coils and choke coils. Ni-Zn high-frequency ferrites have wide bandwidth and low transmission loss, so they are often used as electromagnetic interference (EMI) and radio frequency interference (RFI) cores for the integration of high frequency electromagnetic interference (EMI) and surface mount devices. High frequency power and anti-interference. Ni-Zn power ferrites can be used as RF broadband devices to realize the energy transmission and impedance conversion of RF signals in a wide band, with a lower frequency limit of several kilohertz and an upper frequency limit of thousands of megahertz. The Ni-Zn ferrite material used in the DC-DC converter can increase the frequency of the switching power supply and further reduce the volume and weight of the electronic transformer.

Common magnetic rings-there are basically two kinds of magnetic rings on the general connection line, one is nickel-zinc ferrite magnetic ring, the other is manganese-zinc ferrite magnetic ring, they play different roles.

Mn-Zn ferrites have the characteristics of high permeability and high flux density, and have the characteristics of low loss when the frequency is lower than 1MHz.

The above is the introduction of magnetic ring inductors, if you want to know more about inductors, please feel free to contact us.