I. Structural Design Adaptable to Surveillance Scenarios (Safe + Durable + Easy to Install)

　　1. Security-Grade Protective Structure

　　Flame-Retardant and Impact-Resistant Housing:

　　Made of UL94 V-0 flame-retardant ABS material (2.5mm wall thickness), it withstands high-altitude drops (no cracking after a 1.2-meter drop test) and outdoor UV aging (no discoloration or embrittlement after 5000 hours of UV exposure). The surface is sprayed with a scratch-resistant coating (pencil hardness ≥ 3H) to withstand friction and collisions in corridors and parking lots.

　　Environmental Sealing:

　　The input and output interface areas are equipped with silicone seals, achieving an IP44 (dustproof and splashproof) protection rating, capable of withstanding minor water and dust damage under outdoor awnings and in humid corridors. Built-in moisture-proof insulation (temperature resistant -40°C-80°C) prevents condensation from causing short circuits. 2. Surveillance-Specific Installation

　　Flexible Installation and Wiring:

　　The device measures 85 × 45 × 30 mm (L × W × H) and weighs ≤ 150 g. It supports dual mounting options: wall-mount (with two Φ4 mm mounting holes) and desktop-mount, suitable for concealed installations such as ceilings and walls. It comes standard with a 3-meter pure copper DC output cable (0.75 mm² diameter). One end features a standard 5.5 × 2.1 mm DC connector (compatible with over 90% of box cameras and dome cameras), while the other end features a lock-out terminal design, allowing for concealed wiring through conduit. Heat Dissipation and Quiet Design:

　　Adopting an "aluminum heat sink + natural convection" heat dissipation structure (heat sink area ≥ 12cm²), the linear regulator is directly bonded to the heat sink. The case temperature remains ≤45°C during 24-hour full-load operation. The fanless design (unlike switching power supplies) ensures operating noise ≤10dB, making it suitable for quiet environments such as residential hallways and offices.

　　II. Core Performance (Low Ripple + Multiple Protections)

　　1. 18V 0.8A Precise Output with Low Ripple

　　Stable Output Parameters:

　　The input is compatible with a wide range of 100-240V AC voltage (compatible with global power grids), and the output is 18V DC constant voltage + 0.8A constant current (rated power 14.4W). Voltage accuracy is ±1% (output fluctuation ≤0.18V under load changes), allowing it to drive accessories such as small box cameras, dome cameras, and external microphones. High-definition image quality guaranteed:

　　The "two-stage filtering + LDO voltage regulation" design achieves an output ripple of ≤5mVp-p (much lower than the 50mVp-p of a switching power supply), preventing horizontal streaks and noise in camera images caused by ripple interference. A ripple rejection ratio of ≥60dB (at 50Hz power frequency) ensures stable output even in high-interference environments such as substations and motor rooms.

　　2. Short-circuit protection core design

　　Millisecond short-circuit response:

　　The built-in series sampling resistor short-circuit protection circuit utilizes the LM7818 three-terminal voltage regulator core chip (with built-in short-circuit current limiting). When a short circuit occurs, the output current is cut off within 10ms (limited to less than 1.2A), preventing damage to the camera motherboard or power supply itself. Output automatically resumes after the fault is resolved (no manual reset required), making it suitable for unmanned surveillance scenarios. Multiple Safety Protections:

　　Overvoltage, overcurrent, and overheating protection:

　　Overvoltage protection: Automatically limits output voltage when output voltage ≥ 19.8V;

　　Overcurrent protection: Gradually reduces output when load current ≥ 0.9A to prevent overload;

　　Overtemperature protection: Triggered when the regulator temperature ≥ 85°C (detected by a thermistor) and automatically recovers when the temperature drops to 60°C to prevent high-temperature aging.

　　3. Continuous Operation Reliability in Monitoring Scenarios

　　Wide Operating Temperature Range:

　　Operating temperature range -20°C to 60°C (covering outdoor winters in northern China and sunny summers in southern China). Startup at -20°C without delay, and continuous operation at 60°C for 72 hours without output parameter drift. Humidity tolerance of 10% to 90% (non-condensing), suitable for humid environments such as basements and underground garages. Long-Life Components:

　　Electronic capacitors with a lifespan of 105°C (≥5,000 hours) and oxygen-free copper transformer windings are used. MTBF (Mean Time Between Failures) is ≥50,000 hours at full load, equivalent to over 5 years of continuous use in surveillance scenarios.

　　III. Surveillance Applications (Full Indoor and Outdoor Coverage)

　　1. Core Scenario: Security Camera Power Supply

　　Indoor Surveillance (Corridors/Offices):

　　Compatible with hemispherical cameras up to 4 megapixels. A 3-meter cable can extend from the ceiling distribution box to the camera mount. IP44 protection provides protection against splashing water. Low-ripple output ensures clear images for video conferencing and remote working.

　　Outdoor Surveillance (Communities/Roads):

　　Used with a waterproof junction box, the wide-temperature design withstands temperatures as low as -20°C (outdoors in Northeast China) and as hot as 60°C (rooftops in South China). Short-circuit protection prevents damage to the device caused by rain, reducing O&M costs. 2. Extended Scenario: Security System Support

　　Powering a Multi-Camera Network:

　　A single adapter can power one main camera + one auxiliary camera (total power ≤14W). Centralized power is achieved via a DC splitter, making it suitable for multi-point surveillance in small shops and convenience stores. The output cable can be extended up to 10 meters (voltage drop ≤0.5V), meeting the wiring requirements of large spaces.

　　Powering Camera Accessories:

　　Compatible with external infrared fill lights (power ≤5W) and audio collectors, it can be directly powered by 18V, eliminating the need for an additional power supply and simplifying security system wiring.

　　IV. Maintenance and Compliance Assurance

　　1. Low-Maintenance Design

　　Status Visualization and Easy Replacement:

　　Equipped with a dual-color LED indicator (green = normal output, red = fault/protection), it allows for quick troubleshooting without a multimeter. The modular design allows for pluggable input and output cables, allowing for replacement in ≤2 minutes, making it suitable for rapid property management operations. Zero Maintenance:

　　No fans or consumable parts. Only six-monthly cleaning of the housing's heat dissipation holes is required to prevent dust clogging, resulting in near-zero annual maintenance costs. This product meets the "install once, run for life" requirement for surveillance equipment.

　　2. Safety Certifications and After-Sales Service

　　Global Compliance Certifications:

　　This product is CE (EN 55022 Electromagnetic Compatibility), UL 60950-1, and 3C certified, and compliant with RoHS 2.0 environmental standards. Input and output spacing is ≥8mm, meeting electrical safety clearance requirements and making it suitable for export-oriented surveillance projects.

　　Security-Grade After-Sales Support:

　　A three-year full-unit warranty (including free replacement in the event of short-circuit damage) is provided, along with 24/7 dedicated security equipment customer service. Customized bulk orders are supported (such as project logo printing and cable extensions), meeting the centralized procurement needs of contractors.

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