The **RWS1500B-12/CO2** is a high-reliability, industrial-grade AC-DC single-output power supply manufactured by TDK-Lambda. This specific model belongs to the RWS-B series, designed for long life and high performance in demanding environments. ### Core Technical Specifications | Feature | Specification | | :--- | :--- | | **Input Voltage Range** | 85 - 265 VAC (Universal Input) | | **Output Voltage** | 12V DC | | **Maximum Output Current** | 125A | | **Total Output Power** | 1500W | | **Efficiency** | ~82% - 85% (Typical) | | **Cooling** | Internal Variable Speed Fan | | **Safety Certifications** | UL60950-1, EN60950-1, CE Mark | --- ### Key Internal Electronic Components & Design The unit utilizes a complex architecture to manage high current (125A) while maintaining stability: #### 1. Input Section (EMI & Rectification) * **Line Filter:** Includes X and Y capacitors and common-mode chokes to suppress Electromagnetic Interference (EMI) to meet Class B standards. * **Active PFC (Power Factor Correction):** Uses a high-frequency switching circuit to ensure the power factor is >0.95, reducing harmonic distortion on the AC line. #### 2. DC-DC Conversion Stage * **Primary Switching:** High-power MOSFETs or IGBTs arranged in a bridge topology to convert high-voltage DC into high-frequency AC. * **Power Transformer:** A high-efficiency ferrite core transformer provides galvanic isolation between the input and the 12V output. * **Secondary Rectification:** Since the output current is very high (125A), this stage uses **Synchronous Rectification** (low RDS(on) MOSFETs) instead of standard diodes to minimize heat loss and maximize efficiency. #### 3. Control & Protection Circuits * **Overvoltage Protection (OVP):** Shuts down the unit if the output exceeds approximately 125-145% of nominal voltage. * **Overcurrent Protection (OCP):** Constant current limiting with automatic recovery. * **Over-temperature Protection (OTP):** Thermal sensors on the main heatsinks trigger a shutdown if internal temperatures exceed safety limits. --- ### Understanding the suffix: `/CO2` The `/CO2` suffix is a specific factory option regarding the physical construction and protection of the internal electronics: * **Coating (Conformal Coating):** The internal Printed Circuit Boards (PCBs) are treated with a specialized **Conformal Coating**. * **Purpose:** This thin chemical film protects the electronic components and traces from environmental contaminants such as: * Dust and conductive particles. * High humidity and moisture. * Chemical vapors or mild corrosion. * **Application:** This makes the `/CO2` model ideal for industrial environments where the air quality may be poor or where the device is used in outdoor enclosures. --- ### Terminal Configuration The unit typically features heavy-duty busbars for the **12V Output** to handle the 125A load, and a screw terminal block for the **AC Input** and **Signal Pins** (Remote On/Off, DC Good signal, and Remote Sensing).