1. Based on the characteristics of inductance to current change
In the power supply circuit, differential mode noise is manifested as an asymmetric interference signal between power lines. The basic principle of Iron Silicon Differential Mode Inductor to suppress differential mode noise is its blocking effect on current change. According to the law of electromagnetic induction, when the current passing through the inductor changes, the inductor will generate a self-induced electromotive force to hinder the change of current. For differential mode noise current, Iron Silicon Differential Mode Inductor will generate a reverse electromotive force. For example, when the differential mode noise current tries to increase, the reverse electromotive force generated by the inductor will prevent it from increasing; when the noise current decreases, the reverse electromotive force will hinder its decrease, making it difficult for the differential mode noise current to pass through the inductor smoothly, playing a role in suppressing noise.
2. Filtering effect on differential mode noise frequency
The inductance of Iron Silicon Differential Mode Inductor has different filtering effects on differential mode noise of different frequencies. For high frequency differential mode noise, since the inductive reactance of the inductor (XL = 2πfL, where f is the frequency and L is the inductance) is proportional to the frequency, the inductive reactance is larger at high frequencies. This means that high-frequency differential mode noise will encounter great obstacles when passing through the Iron Silicon Differential Mode Inductor, and its energy is consumed in large quantities by the inductor, thereby achieving effective suppression of high-frequency differential mode noise. For low-frequency differential mode noise, although the inductance is relatively small, since the inductor always has an obstacle to the current change, it can still suppress low-frequency differential mode noise to a certain extent, but the suppression effect is slightly weaker than that of high frequency.
3. Synergy with the power supply circuit
In the power supply circuit, the Iron Silicon Differential Mode Inductor works with other circuit elements to suppress differential mode noise. It is usually used in conjunction with a capacitor to form an LC filter circuit. The capacitor can store charge and buffer the change of voltage, while the inductor hinders the change of current. When the differential mode noise enters this LC filter circuit, the inductor first hinders the noise current, and then the capacitor further filters the noise voltage. This synergy can more effectively filter the differential mode noise from the power supply circuit and improve the purity of the power supply.
4. Utilize the magnetic properties of iron silicon materials
Iron silicon materials have specific magnetic properties such as magnetic permeability. These characteristics help Iron Silicon Differential Mode Inductor to better concentrate the magnetic field and enhance the ability of the inductor to suppress differential mode noise. When the differential mode noise current passes through the inductor, the iron silicon core can effectively concentrate the magnetic field, making the self-induced electromotive force generated by the inductor more stable and significant. At the same time, the magnetic properties of iron silicon materials also help to reduce the magnetic loss of the inductor itself to a certain extent, improve the efficiency of suppressing differential mode noise, and ensure that the propagation of differential mode noise can be continuously and effectively suppressed during the operation of the power supply circuit.
