Introduction to DC power filter circuit: The circuit consists of three parts: the first part is a primary LC filter circuit, the second part is a common mode EMI filter, and the third part is a secondary LC filter circuit. LC filter, commonly known as passive filter, is a traditional DC power harmonic compensation device composed of inductance and capacitance, which can filter out harmonics in the power supply once or multiple times and purify the DC power supply. Common mode filtering can address the problem of rapid transient group pulse interference with a repetition frequency of several thousand hertz in certain user sites, and can play a suppressive role. The PCB specification is FR4 42X77X1.6MM, with optimized layout for high current circuits and short paths, which can withstand higher currents and minimize external interference. The equipped inductors come in specifications: 20A. Features: 1. Compact and well-designed 2. Reliable performance 3. Low power loss 4. Wide application range 5. Optimized design for high current transmission lines Specifications: Input: DC up to 50V (electrolytic capacitor can be replaced for use at higher voltage) Output: DC Current: 20A Circuit board: double-sided FR4 fiberglass board Electrolytic capacitor: 50V 470UF, 2 pieces Film capacitor: 100NF, 2 pieces; 470PF, 1 piece Magnetic ring inductance: 2 pieces (iron silicon aluminum core selected for 20A high current) Common mode inductance: 1 piece (flat copper wire designed for 20A high current) Socket: 7.62mm pitch terminal block, 2PIN, 3PIN, 1 piece each This module is suitable for reducing electromagnetic interference in DC power sources and can be applied to DC circuits with strong electromagnetic interference in automobiles, motorcycles, and other industrial applications.