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Magnetic loop inductance
Aug 20, 2017



Magnetic loop inductance


In choosing a high-quality computer host, you have to choose a host that minimizes electromagnetic leakage. Why? Because this kind of host generally uses magnetic loop inductance, the magnetic ring has different impedance characteristics at different frequencies. Generally, the impedance is very small at low frequencies. When the signal frequency increases, everyone knows that the higher the signal frequency, the easier it is to radiate. . The general signal lines are all without a shielding layer, then these signal lines become good antennas, receiving various messy high-frequency signals in the surrounding environment, and these magnetic ring inductances, color ring inductances, chip inductors, Transformers, power inductors, bead inductors, laminated inductors, and electronic news signals are superimposed on the originally transmitted signals, and even change the useful signals originally transmitted. Under the action of the magnetic ring, the normally useful signals pass well. It can also suppress the passage of high-frequency interference signals. Therefore, choose the host that minimizes electromagnetic leakage, in other words, the host with strong anti-interference. And there are many kinds of magnetic rings. How do we choose?

Different magnetic materials have different magnetic permeability and different temperature characteristics. Among them, the temperature characteristic is the most important, because an energy-saving lamp is working, the magnetic ring inductance must be subjected to normal temperature, high temperature (up to 100 ° C), low temperature, and then work constantly at high temperature. However, the temperature profiles of different materials will be very different. The low magnetic permeability will be flat in the first half, and the magnetic permeability will be steeper. The saturation magnetic induction BS changes in different temperatures. It is also different. It is assumed that the BS value of 3K material is 200 at normal temperature, but the BS value will rise to 300 at 100 °C. Similarly, the BS value of 2.5K material at room temperature is 200, but the BS value is only 100 °C. 250. The change of temperature will cause the change of BS value u, H, HC; the change of BS value will cause the change of the working state of the energy-saving lamp line; the increase of BS value will cause the drive current of the triode to decrease. Therefore, in the 110V line, if the magnetic ring with a relatively large change in BS value at high temperature is selected, it will cause the lamp to turn off and then turn on immediately after the high temperature is turned on, and the lamp cannot be activated; the filaments at both ends of the lamp are emitted. Red, because the lamp cannot be activated; the power will be twice the rated power. In addition, since the lamp can not be started normally, the temperature of the filaments at both ends will rise very high (nearly 300 ° C or more), so that the plastic parts will be burned off. If a magnetic ring whose BS value does not change much with temperature is selected, that is, a magnetic ring whose magnetic permeability is not high, the above problem can be solved. However, the high and low magnetic permeability have another problem to be considered: it is the loss problem. The magnetic ring with high magnetic permeability like 5K and 10K has a small loss. After the finished pulse transformer is used, Because its magnetic path impedance is relatively small, the delay time is relatively small, its output waveform can be done very well, but it can not be adapted to the above temperature problems; when the magnetic permeability is low, its surface performance is good. Not as good as 5K, 10K, but it will not appear when the light starts.

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