The **CUS1500M-15/CO2** is a high-reliability, medical and industrial grade AC-DC power supply manufactured by TDK-Lambda. This specific model provides a 15V output with a high power density. Below is a detailed breakdown of its electronic components, specifications, and features. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Input Voltage Range** | 85 - 265 VAC (Universal Input) | | **Output Voltage** | 15 VDC (Adjustable ±20%) | | **Output Current** | 100 A | | **Maximum Power** | 1500 W | | **Efficiency** | Up to 88% | | **Cooling** | Internal Variable Speed Fan | | **Safety Certifications** | IEC60601-1 (Medical), IEC62368-1 (Industrial) | --- ### 2. Breakdown of Internal Electronic Sections The device utilizes a sophisticated multi-stage conversion architecture: #### A. Input Stage (EMI & Protection) * **EMI Filter:** Includes X and Y capacitors and common-mode chokes to minimize electromagnetic interference, ensuring compliance with EN55011/EN55032 Class B. * **Inrush Current Limiter:** Uses thermistors or active relay circuits to prevent high current spikes when the unit is first powered on. * **Bridge Rectifier:** Converts AC input to pulsating DC. #### B. Power Factor Correction (PFC) * **Active PFC Circuit:** Uses a boost converter topology to ensure the power factor is >0.95. This reduces harmonic distortion and improves energy efficiency. #### C. DC-DC Conversion Stage * **Switching Transistors (MOSFETs/IGBTs):** High-speed switches that convert high-voltage DC into high-frequency AC for the main transformer. * **Main Transformer:** Provides galvanic isolation (4kVAC for medical safety) between the primary and secondary sides. * **Synchronous Rectification:** On the 15V secondary side, high-efficiency MOSFETs are used instead of standard diodes to reduce heat loss at the 100A current rating. #### D. Control and Monitoring * **Fan Control:** A temperature-dependent circuit varies the fan speed to reduce acoustic noise during lower loads. * **Protection Circuits:** * **OVP (Over Voltage Protection):** Shuts down the unit if output exceeds ~18V. * **OCP (Over Current Protection):** Constant current limiting with automatic recovery. * **OTP (Over Temperature Protection):** Thermal sensors on the heatsinks trigger a shutdown if internal temperatures exceed safe limits. --- ### 3. The "/CO2" Suffix Meaning In TDK-Lambda nomenclature, the **CO2** suffix refers to a specific hardware modification: * **Coating:** The internal Printed Circuit Boards (PCBs) are treated with a **Conformal Coating**. * **Function:** This thin polymer film protects the electronic components and copper traces from moisture, dust, and chemical contaminants, extending the life of the unit in harsh environments. --- ### 4. Interface and Connectivity * **Screw Terminals:** Heavy-duty busbars/terminals for the 100A output. * **Signal Connector:** Provides access to: * **Remote On/Off:** Allows the PSU to be toggled via a logic signal. * **DC Good Signal:** An open-collector signal that indicates if the output voltage is within range. * **Remote Sense:** Compensates for voltage drops across long output cables.