The **Tripp Lite SMART2200NET** is a line-interactive Uninterruptible Power Supply (UPS). Its electronic architecture is designed to balance raw utility power, provide battery backup during outages, and filter electromagnetic interference. --- ### 1. Core Electronic Components The SMART2200NET consists of several integrated subsystems that manage power conversion and regulation. | Component | Function | Description | | :--- | :--- | :--- | | **AVR Transformer** | Voltage Regulation | Uses "Automatic Voltage Regulation" to boost or cut voltage without using battery power. | | **Inverter** | DC to AC Conversion | Converts 24V DC battery power into 120V AC output when utility power fails. | | **Rectifier/Charger** | AC to DC Conversion | Converts incoming AC power to DC to keep the internal battery strings charged. | | **Control Logic PCB** | System Monitoring | The "brain" that monitors line frequency, voltage levels, and load capacity. | | **Transfer Switch** | Power Routing | A high-speed relay that switches the load from utility to battery in <4-8 milliseconds. | --- ### 2. Detailed Circuitry Breakdown #### A. Automatic Voltage Regulation (AVR) Unlike basic standby UPS systems, the SMART2200NET uses a multi-tap transformer. - **Brownout Correction:** If voltage drops (e.g., to 95V), the logic board switches to a different transformer tap to boost it back to ~120V. - **Overvoltage Correction:** If voltage spikes (e.g., to 135V), it trims the voltage down. #### B. The Inverter Section The SMART2200NET typically produces a **PWM Sine Wave** (often referred to as a "modified" or "step" sine wave) when in battery mode. - **Power MOSFETs:** Large metal-oxide-semiconductor field-effect transistors are used to switch the DC current at high frequencies to mimic an AC wave. - **Heat Sinks:** Massive aluminum blocks are attached to these transistors to dissipate heat during extended outages. #### C. Communication Ports The "NET" suffix indicates advanced communication electronics: - **DB9 Serial Port:** Uses RS-232 protocols to communicate with servers. - **Contact Closure:** Basic pins that signal "Power Failed" or "Battery Low" to legacy equipment. - **SNMP Slot:** An internal interface for an optional network card (like the WEBCARDLX). --- ### 3. Battery Configuration The electronics are designed to interface with a specific battery string: - **Voltage:** 24V DC System. - **Configuration:** Usually 4x 12V 12Ah batteries (wired in a series-parallel configuration). - **Circuit Protection:** Includes a resettable thermal circuit breaker to prevent electronic damage during a short circuit or massive overload. --- ### 4. Technical Specifications Summary | Feature | Specification | | :--- | :--- | | **Output Capacity** | 2200VA / 1700W | | **Waveform Type** | Sine Wave (Line), PWM Sine Wave (Battery) | | **Input Connection** | NEMA 5-20P | | **Data Protection** | RJ45 (Network/Phone) Surge Suppression |