The **RWS1500B-36/CO2** is a high-performance, industrial-grade AC-DC switch-mode power supply manufactured by TDK-Lambda. This specific model belongs to the RWS-B series, designed for high reliability and long life cycles. --- ### 1. Technical Specifications Table | Feature | Specification | | :--- | :--- | | **Output Voltage** | 36V DC | | **Max Output Current** | 42A | | **Max Output Power** | 1512W | | **Input Voltage Range** | 85 - 265V AC (Universal Input) | | **Efficiency** | ~88% at 200VAC | | **Cooling** | Internal Variable Speed Fan | | **Operating Temp** | -20°C to +70°C (with derating) | | **Safety Certifications** | UL60950-1, EN60950-1, CE Mark | --- ### 2. Breakdown of the Model Name Understanding the suffixes is crucial for identifying the specific electronics and board treatments: * **RWS1500B**: The base series and wattage (1500 Watts). * **36**: The nominal output voltage (36 Volts). * **/CO2**: This indicates a **Conformal Coating** on both sides of the Printed Circuit Board (PCB). This treatment protects the internal electronic components from dust, humidity, and chemical contaminants. --- ### 3. Key Electronic Subsystems #### A. Input Stage (EMI & Rectification) * **EMI Filter**: Includes X and Y capacitors and common-mode chokes to suppress electromagnetic interference. * **Active PFC (Power Factor Correction)**: Utilizes a boost converter circuit to ensure a power factor of 0.95 or higher, reducing harmonic distortion. * **Inrush Current Limiting**: Uses thermistors or relay circuits to prevent high current spikes when the unit is first powered on. #### B. Conversion Stage (Inverter) * **Switching Topology**: Typically employs a "Full-Bridge" or "LLC Resonant" converter to achieve high efficiency and reduce thermal stress on the MOSFETs. * **Control ICs**: Advanced PWM (Pulse Width Modulation) controllers manage the switching frequency to maintain stable voltage under varying loads. #### C. Output Stage (Rectification & Filtering) * **Secondary Rectification**: High-speed Schottky diodes or Synchronous Rectification MOSFETs convert the high-frequency AC back to 36V DC. * **Filter Bank**: Low-ESR (Equivalent Series Resistance) electrolytic capacitors smooth out the ripple voltage. --- ### 4. Protection Features The internal circuitry includes several protection layers to prevent damage to the load or the power supply itself: 1. **Overcurrent Protection (OCP)**: Limits output current to roughly 105% of rating; usually operates in "constant current" or "hiccup" mode. 2. **Overvoltage Protection (OVP)**: Shuts down the unit if the output exceeds approximately 120% of the nominal 36V. 3. **Over-Temperature Protection (OTP)**: Thermal sensors monitor the heat sink; the unit shuts down if internal temperatures exceed safety limits. ---