Introduction to DC Power Filter Circuit: The circuit consists of three parts: a primary LC filter circuit, a common-mode filter, and a secondary LC filter circuit. LC filters—also known as passive filters—are traditional DC power harmonic compensation devices composed of inductors and capacitors. They effectively reduce harmonics in the power supply and help purify the DC output. Common-mode filtering helps suppress fast transient pulse interference with repetition frequencies in the kHz range, commonly encountered in certain industrial or automotive environments. PCB specification: FR4, 42 × 77 × 1.6 mm. Designed with short trace lengths for high-current paths to improve current handling capability and reduce external interference. Inductors rated for 20 A. Features: 1. Compact and lightweight 2. Reliable performance 3. Low power loss 4. Broad application compatibility 5. Optimized layout for high-current paths Specifications: Input: DC ≤ 50 V (electrolytic capacitors may be upgraded for higher voltage operation) Output: DC Rated current: 20 A PCB: Double-sided FR4 fiberglass board 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 choke: 1 pc (flat copper winding, rated for 20 A) Connectors: 7.62 mm pitch, 2-pin, 3-pin — 1 pc each This module is designed to reduce electromagnetic interference (EMI) in DC power supplies and is suitable for use in automotive, motorcycle, and other industrial DC applications with high EMI levels. Note: Appearance and component color may vary slightly between production batches.