## Technical Overview: RWS1500B-15/CO2 The **RWS1500B-15/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 life cycles. ### 1. Model Breakdown The nomenclature reveals the core specifications: | Segment | Meaning | Specification | | :--- | :--- | :--- | | **RWS** | Series Name | General Purpose Industrial | | **1500B** | Power Rating | 1500 Watts | | **15** | Output Voltage | 15V DC | | **/CO2** | Option Code | **Conformal Coating** on both sides of the PCB | --- ### 2. Key Electronic Components & Features The unit utilizes a sophisticated internal topology to manage high wattage in a compact form factor: #### A. Input Section (Primary Side) * **Universal AC Input:** Operates from 85V to 265V AC. * **Active PFC (Power Factor Correction):** Uses an active circuit to ensure a power factor of 0.98 (at 100VAC) or 0.95 (at 200VAC), complying with EN61000-3-2 standards. * **Inrush Current Limiting:** Thermistors or power relays protect internal components from surges during startup. #### B. Conversion Stage * **Switching Topology:** Typically utilizes a forward converter or bridge topology with high-frequency MOSFETs to minimize heat and size. * **Transformer:** High-grade ferrite core for efficient energy transfer and galvanic isolation between primary and secondary stages. #### C. Output Section (Secondary Side) * **Voltage Adjustment:** Includes a built-in potentiometer allowing the 15V output to be tuned (typically ±10%). * **Smoothing Capacitors:** High-temperature (105°C) electrolytic capacitors ensure low ripple and noise (typically 150mV peak-to-peak). * **Bus Bars:** Heavy-duty copper terminals to handle the high current output (up to 100A). --- ### 3. Protection Circuits The electronic control board integrates several safety mechanisms: 1. **Overcurrent Protection (OCP):** Constant current limiting with automatic recovery. 2. **Overvoltage Protection (OVP):** Shuts down the unit if the output exceeds a set threshold (approx. 115-140%) to protect the load. 3. **Over-temperature Protection (OTP):** Thermal sensors shut the unit down if internal temperatures exceed safe operating limits. --- ### 4. Special "CO2" Feature: Conformal Coating The **/CO2** suffix is a critical electronic modification: * **Material:** A thin polymeric film is applied to the PCB. * **Purpose:** Protects electronic components from dust, moisture, and chemical contaminants. * **Application:** Essential for harsh industrial environments where conductive dust or high humidity could cause short circuits or electrochemical migration. --- ### 5. Technical Specifications Summary | Feature | Details | | :--- | :--- | | **Output Current** | 100 Amps | | **Efficiency** | ~82% - 85% | | **Cooling** | Internal forced air (Built-in Fan) | | **Remote Sensing** | Supported (compensates for voltage drops in wiring) | | **Isolation** | Input to Output: 3.0kVAC |