The low-pass filter can absorb most of the " burrs " of the power supply
November 10 , 2022
The low-pass filter can absorb most of the " burrs " of the power supply . L1 and L2 in the figure are used to suppress high-frequency differential mode voltage . L1 and L2 are reversely wound on the same magnetic ring with equal-length wires , 50HZ The magnetic fluxes generated by the power frequency current in the magnetic ring cancel each other out, and the magnetic ring will not be saturated.
The magnetic flux generated by the common mode interference current in the two lines is superimposed in this ring, and the common mode interference is blocked by L3 and L4. In the figure, C1 and C2 are used to filter out the common mode interference voltage, and C3 is used to filter Differential mode interference voltage.
The high-frequency interference signal is not transmitted through the coupling of the transformer windings, but through the distributed capacitance between the primary and secondary windings. Adding a shielding layer between the primary and secondary windings and grounding it together with the iron core can reduce the distributed capacitance between the windings and improve the ability to resist high-frequency interference.
Power filter products can also be used, such as the power filter of Beijing Zhongshi Company, which has good common mode filter, differential mode filter performance and high-frequency interference suppression performance, and can effectively suppress the line-to-line and line-to -ground. interference, its products can be used for AC single-phase, three-phase power and DC power. C/D series high-performance filters are suitable for electronic equipment with transient
The interested persons of mentioned parts may relate with me, price liberally. --