The **LEDPROSLWH** is a specific professional-grade LED PIR (Passive Infrared) sensor floodlight, typically manufactured by **Luceco**. To understand its electronic parts, we must break it down into its three primary subsystems: the LED Array, the PIR Sensor Module, and the Power Driver. --- ### 1. Key Electronic Components | Component | Function | Technical Detail | | :--- | :--- | :--- | | **LED Chips** | Light Generation | High-efficiency SMD (Surface Mount Device) LEDs mounted on a metal-core PCB for heat dissipation. | | **PIR Sensor** | Motion Detection | A pyroelectric sensor that detects infrared radiation (heat) moving across its field of view. | | **LED Driver** | Power Conversion | An AC-to-DC constant current converter that regulates the voltage for the LEDs. | | **Fresnel Lens** | Optical Focus | The white plastic cover over the sensor that focuses infrared energy onto the PIR element. | | **Potentiometers** | User Control | Small adjustable resistors (Trimpots) used to set Time, Sensitivity, and Lux levels. | --- ### 2. Functional Subsystems #### A. The Driver Circuitry The "LWH" designation often refers to the white finish and high-efficiency driver. This circuit performs several tasks: * **Rectification:** Converts 220-240V AC mains to DC. * **Smoothing:** Uses electrolytic capacitors to remove "flicker" from the current. * **Protection:** Includes a MOV (Metal Oxide Varistor) to protect the LEDs from voltage surges. #### B. The PIR Control Module This is the "brain" of the unit. It consists of: * **The IC Controller:** Processes the analog signal from the PIR sensor and triggers the relay. * **Lux Sensor (Photocell):** A light-dependent resistor (LDR) that prevents the light from turning on during daylight. * **Electromagnetic Relay:** A mechanical or solid-state switch that clicks "on" to complete the circuit to the LEDs when motion is detected. #### C. Thermal Management Since LEDs generate heat from the back of the chip: * **Aluminium Housing:** Acts as a massive heat sink. * **Thermal Paste/Pad:** Conducts heat from the LED board to the outer casing to prevent the chips from burning out. --- ### 3. Connection Diagram (Simplified) ```mermaid graph LR A[Mains Power] --> B[PIR Sensor Logic] B --> C{Trigger?} C -- Yes --> D[LED Driver] D --> E[LED Array] C -- No --> F[Standby Mode] ``` --- ### 4. Technical Specifications (Typical) * **Voltage:** 220-240V AC. * **Color Temperature:** Usually 5000K (Cool White). * **IP Rating:** IP65 (Dust tight and protected against water jets). * **PIR Range:** Approximately 10-12 meters with a 180-degree detection angle.