The circuit consists of three levels of filtering, the first part is a – level LC filter circuit, the second part is a common-mode EMI filter, and the third part is a two-level LC filter circuit. The LC filter is generally known as a passive filter. It is a traditional DC power supply harmonic compensation device, composed of inductors and capacitors. It filters out the first or multiple harmonics in the power supply.
Purification and common-mode filtering of the DC power supply can suppress the problem of fast transient group pulse interference with repetition frequency up to several kilohertz at some user sites. The module is suitable for eliminating the use of DC power supplies with electromagnetic interference. It can be applied to switching power supply output, automobile, motorcycle, strong electromagnetic interference of DC power after filtering.

Note:
Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you!
Please allow 1-2cm measuring deviation due to manual measurement.