The circuit consists of three parts: a singlestage filter circuit, a common mode filter, and a twostage filter circuit. The filter, commonly known as a passive filter, is a traditional direct current harmonics compensation device composed of inductance and capacitance. Common mode filtering can suppress fast transient interference problems with repetition rates of several kilohertz at certain user positions. It can filter out single or more harmonics in the power supply and purify the direct current power supply. Key benefits and features Improves power quality: reduces harmonic content and cleans the DC output to support stable operation of connected equipment. Noise reduction: lowers electrical noise and minimizes interference with sensitive loads. Robust threepart design: combines a singlestage filter, a common mode filter, and a twostage filter to address both differential and common mode disturbances. Passive and reliable: built from inductors and capacitors, offering a lowmaintenance solution with no active components required. Flexible integration: modular threepart arrangement facilitates integration with existing DC power systems and filtration needs. Performance focus: targets harmonics in the power supply and enhances the purity of the DC power supply, including suppression of fast transient disturbances in the kilohertz range. Typical use scenarios Precision laboratory instruments requiring clean DC power for accurate measurements and reliable operation. Sensitive electronics in automated manufacturing equipment where reduced noise and improved power stability can enhance performance and lifespan. Industrial control panels and power supplies that benefit from harmonic reduction and fast transient suppression to improve overall system reliability.