Magnetic bar inductance coils are often useful in daily production! So what effect does current have on them?

Southern electrical component manufacturers understand it this way!

Magnetic bar inductance coil is DC resistance AC! Inductance is made with coil! But when the alternating current passes through the coil, the magnetic flux will change, and the coil will generate induced electromotive force, which will hinder the change of magnetic flux! If it is direct current, there is no change in the magnetic flux because there is no change in the direction of the current! Except for the blocking effect when the power is initially applied, it is quite equivalent to a wire after stabilization!

First, the effect of current on the magnetic coil inductance coil?

Passing DC and blocking AC This is a simple statement. Isolate and reduce the AC signal or form a resonant circuit with resistors, capacitors, etc., and the role of tuning and frequency-selective inductors: Inductance coils and capacitors can form LC tuning circuits in parallel. That is, the natural oscillation frequency of the circuit 0 is equal to the frequency of the non-AC signal, so the inductive reactance and capacitive reactance of the circuit are also equal, so the electromagnetic energy oscillates back and forth between the inductance and capacitance, which is the resonance phenomenon of the LC circuit. At the time of resonance, because the capacitive reactance and inductive reactance of the circuit are reversed, the inductive reactance of the total loop current is small and the amount of current (referring to the AC signal of -0). Therefore, the LC resonant circuit has the function of selecting the frequency and can The frequency of the AC signal is selected.

Second, the effect of current on the shield signal of the magnetic coil inductor?

It can be understood that the role of the magnetic rod inductance coil is so large. Manufacturers know that the higher the signal frequency, the easier it is to shoot out, and the general signal lines are not shielded. These signal lines become very A good antenna receives various cluttered high-frequency signals in the surrounding environment. However, these signals are superimposed on the original transmitted signal, and even the original useful signal is changed, which seriously hinders the normal operation of the electronic device, thereby reducing the electromagnetic Interference (EM) is an issue that must be considered. Under the influence of the magnetic ring inductance, even if the normal useful signal passes smoothly, it can well suppress the high-frequency disturbance signals, and the cost is low. The role of the magnetic rod inductance coil includes excessive noise, screening signals, stable current and Suppress important effects such as electromagnetic wave dry wiping.

The effect of the current on the magnetic coil inductance coil is still very large, so the inductor manufacturers have to carry out more rigorous testing on them!