The term **VIPAC** primarily refers to a family of modular, configurable AC-DC power supplies manufactured by **Vicor Corporation**. These systems are designed to provide high-density power conversion using a "plug-and-play" architecture. Below is an explanation of the electronic components and the modular architecture that defines a VIPAC system. --- ### 1. Core Architecture: The Modular Design A VIPAC system is not a single monolithic circuit; it is an assembly of discrete power stages integrated into a single chassis. | Component Type | Function | Description | | :--- | :--- | :--- | | **Front End** | Rectification & Filtering | Converts AC mains (115/230VAC) to a high-voltage DC bus. Includes EMI filtering. | | **Power Modules** | DC-DC Conversion | The "bricks" (Maxi, Mini, Micro) that step down the bus voltage to specific output levels (e.g., 5V, 12V, 48V). | | **Backplane** | Connectivity | The internal PCB that routes signals and power between the front end and the output modules. | | **Heatsink/Chassis** | Thermal Management | Provides the structural integrity and the surface area required to dissipate heat. | --- ### 2. Key Electronic Parts & Technologies #### A. Vicor V375 Series DC-DC Converters The "heart" of most VIPAC systems are the **V375 series** modules. * **ZCS/ZVS Switching:** These use Zero-Current Switching and Zero-Voltage Switching to minimize power loss and electronic noise. * **High Power Density:** Because they switch at high frequencies (MHz range), the internal transformers and capacitors can be much smaller than traditional power supplies. #### B. Input Attenuator & Filter Modules To comply with global standards (like EN55022 for EMI), VIPACs include: * **MOVs (Metal Oxide Varistors):** For surge protection. * **Inductors/Chokes:** To suppress Common Mode and Differential Mode noise. * **Bridge Rectifiers:** To convert the incoming AC sine wave into pulsating DC. #### C. Control & Monitoring Circuitry The VIPAC system includes interface pins for system-level control: * **Output Trim:** A resistor-based or voltage-based input to adjust the output voltage slightly (usually +/- 10%). * **Remote Sense:** Compensates for voltage drops across long output wires. * **Enable/Disable (Primary or Secondary):** Allows logic-level control to turn specific outputs on or off. --- ### 3. Technical Specifications Table Typical VIPAC configurations often fall within these parameters: | Feature | Range/Specification | | :--- | :--- | | **Input Voltage** | 115/230 VAC (Auto-ranging or Strappable) | | **Output Channels** | 1 to 3 independent outputs | | **Output Power** | 50W to 900W+ (depending on chassis size) | | **Efficiency** | 80% to 90% typically | | **Isolation** | 3000V RMS (Input to Output) | --- ### 4. Example Internal Block Diagram (Simplified) ```mermaid graph LR AC_In --> Filter[EMI Filter & Rectifier] Filter --> DC_Bus[375V DC Bus] DC_Bus --> Mod1[DC-DC Module 1: 5V] DC_Bus --> Mod2[DC-DC Module 2: 24V] Mod1 --> Out1[Output 1] Mod2 --> Out2[Output 2] ```