Introduction to DC Power Filter Circuit: The circuit consists of three parts: a primary LC filter circuit, a common-mode EMI filter, and a secondary LC filter circuit. The LC filter, also known as a passive filter, is a traditional DC power harmonic compensation device composed of inductors and capacitors. It filters harmonics from the power supply and helps purify the DC output. Common-mode filtering helps suppress fast transient burst interference with repetition frequencies in the kilohertz range. PCB specification: FR4, 42 × 77 × 1.6 mm. Designed with short traces for high-current paths to improve current handling and reduce external interference. Inductors rated for 20 A. Features: 1. Compact design 2. Reliable performance 3. Low power loss 4. Broad application range 5. Optimized trace layout for high-current conduction Specifications: Input: DC ≤ 50 V (electrolytic capacitors may be replaced for higher-voltage operation) Output: DC Rated current: 20 A Circuit board: Double-sided FR4 fiberglass PCB Electrolytic capacitors: 50 V, 470 µF, 2 pcs Film capacitors: 100 nF, 2 pcs; 470 pF, 1 pc Toroidal inductors: 2 pcs (iron-silicon-aluminum core, rated for 20 A) Common-mode inductor: 1 pc (flat copper winding, rated for 20 A) Terminals: 7.62 mm pitch, 2-pin and 3-pin connectors, 1 pc each This module is designed to reduce electromagnetic interference in DC power supplies and is suitable for use in automotive, motorcycle, and other industrial DC applications with high EMI levels.