The **RWS1500B24/CO2** is a high-power, industrial-grade AC-DC switch-mode power supply manufactured by TDK-Lambda. This specific model is part of the RWS-B series, designed for high reliability and long-term stability. ### 1. Model Breakdown | Code Segment | Meaning | | :--- | :--- | | **RWS** | Series Name (General Purpose Industrial) | | **1500B** | Power Rating (Approx. 1500 Watts) | | **24** | Output Voltage (24V DC) | | **CO2** | Option code: **Conformal Coating** on both sides of the PCB | --- ### 2. Key Electronic Specifications The internal architecture utilizes high-efficiency switching topologies to manage high current loads. * **Input Range:** 85 - 265VAC (Universal Input) with Active Power Factor Correction (PFC). * **Output Current:** 63A (at 24V). * **Efficiency:** Typically 82% to 88% depending on the load and input voltage. * **Protection Circuits:** * **Overcurrent Protection (OCP):** Constant current limiting with automatic recovery. * **Overvoltage Protection (OVP):** Shuts down the output to prevent damage to connected electronics. * **Overheat Protection (OTP):** Thermal sensors shut down the unit if internal temperatures exceed safety limits. --- ### 3. Critical Internal Components The unit is composed of several high-grade electronic stages: #### A. Input Stage (EMI & Rectification) * **EMI Filter:** Uses X and Y safety capacitors and common-mode chokes to suppress electromagnetic interference. * **Inrush Current Limiter:** Typically uses a thermistor or relay circuit to prevent a massive current spike when the unit is first powered on. #### B. Active PFC Stage * **PFC Controller IC:** Optimizes the power factor to >0.95, ensuring compliance with harmonic current standards (IEC61000-3-2). * **Power MOSFETs:** High-speed switching transistors that shape the input current. #### C. DC-DC Converter Stage * **Main Transformer:** A high-frequency ferrite core transformer provides galvanic isolation between the AC input and DC output. * **Output Rectifiers:** High-current Schottky diodes or synchronous rectification MOSFETs convert the high-frequency AC from the transformer back to DC. * **Filter Capacitors:** Large electrolytic capacitors with high ripple current ratings to ensure low output noise. #### D. The "/CO2" Specifics * **Conformal Coating:** The printed circuit board (PCB) is sprayed with a thin polymeric film. This protects the electronic traces and solder joints from: * Humidity and moisture. * Conductive dust and contaminants. * Corrosion in harsh industrial environments. --- ### 4. Physical & Interface Features * **Cooling:** Internal DC fan (forced air cooling). * **Remote Sensing:** Allows the power supply to compensate for voltage drops in the load wires. * **Remote ON/OFF:** Electronic signal control to toggle power without breaking the AC line. ---