The **ZWS300BAF-36/R** is a high-reliability, open-frame AC-DC power supply manufactured by TDK-Lambda. It belongs to the ZWS-BAF series, designed for industrial applications requiring high efficiency and a compact footprint. --- ### 1. Key Technical Specifications The following table highlights the primary electronic parameters of the ZWS300BAF-36/R: | Parameter | Specification | Details | | :--- | :--- | :--- | | **Input Voltage Range** | 85 - 265 VAC | Universal input (47-63Hz) | | **Output Voltage** | 36 VDC | Fixed DC output | | **Max Output Power** | 300 W | Continuous power rating | | **Max Output Current** | 8.4 A | Peak current may vary by cooling | | **Efficiency** | ~88% - 91% | Depending on input voltage | | **PFC** | Active PFC | Compliant with EN61000-3-2 | | **Suffix "/R"** | Remote ON/OFF | Includes a control circuit for logic switching | --- ### 2. Core Electronic Features #### Power Factor Correction (PFC) The unit features active Power Factor Correction, which minimizes harmonic current distortion and ensures compliance with international standards. This reduces the reactive power load on the electrical infrastructure. #### The "/R" Remote Control Circuit The "R" suffix indicates a specific internal sub-circuit. It allows the power supply to be turned on or off via an external electrical signal (usually a logic-level voltage) without needing to interrupt the high-voltage AC input. This is critical for automated systems and energy-saving standby modes. #### Protection Circuits The internal PCB is populated with several safety mechanisms: * **Over Current Protection (OCP):** Automatically limits current to prevent damage during a short circuit. * **Over Voltage Protection (OVP):** Shuts down the unit if the 36V rail exceeds a safe threshold (typically around 41-48V). * **Thermal Protection:** Integrated sensors monitor the temperature of the MOSFETs and transformers to prevent meltdown under heavy load or poor ventilation. --- ### 3. Component Architecture The design utilizes a **Single-Ended Forward Converter** topology, which is common for the 300W power range. Key internal components include: 1. **Input Filter:** High-quality X and Y capacitors and common-mode chokes for EMI/EMC suppression. 2. **Bulk Capacitor:** Large electrolytic capacitor rated for high ripple current to maintain DC stability. 3. **Power MOSFETs:** High-speed switching transistors (typically Silicon-based) mounted on aluminum heatsinks. 4. **Secondary Rectifiers:** High-voltage Schottky diodes or synchronous rectification components to convert high-frequency AC back to 36V DC. --- ### 4. Environmental and Mechanical Data * **Cooling:** Convection cooled (300W achieved with 0.7m/s airflow; lower wattage for natural convection). * **Form Factor:** Open frame (L-bracket or PCB-only styles available). * **Operating Temp:** -10°C to +70°C (with derating above 50°C).