The function of magnetic rod inductance: 1. It is mainly used for DC filter in switching power supply. In the magnetic path of magnetic rod inductance, it needs to go through a long air section. The air magnetoresistance is very large, the energy is concentrated here, and the air magnetic circuit will not be saturated.
2. Suppression of conductive interference signal: theoretically suppressing the conductive interference signal requires that the larger the inductance of the rod inductance, the better the distributed capacitance, but for the rod inductance, the larger the inductance, the greater the distributed capacitance, and the interaction between the two will be offset. The impedance of magnetic rod inductance increases with the increase of frequency at the beginning, but when the impedance increases to its maximum value, the impedance decreases rapidly with the increase of frequency, which is due to the effect of parallel distributed capacitors. When the impedance increases to the maximum value, it is where the distributed capacitance and the equivalent inductance of the magnetic rod inductance produce parallel resonance. The inductance of magnetic rod is mainly used to suppress low frequency interference signal. Therefore, to suppress a wide frequency band interference signal, it is necessary to use multiple inductances of different properties at the same time to be more effective.
