Line-Interactive
Line-interactive UPS topology sits between offline and online double-conversion. Under normal conditions the load is fed from utility but through an auto-transformer that compensates for sags and surges via tap-switching — a continuous form of voltage regulation called AVR (see Automatic Voltage Regulation). Only on deeper events (full outage, frequency excursion, or sag past the AVR’s working range) does the unit transfer to inverter feed.
This topology gives most of the protection of online double-conversion at lower cost and higher full-load efficiency, because the inverter is not continuously processing the load. The trade-off is a small (typically a few ms) transfer time and dependence on the AVR’s correction window for waveform conditioning.
Implemented by
- Vision — Riello’s digital line-interactive series at 800–2000 VA
Connections
- Vision — implements_feature, source: https://standbysystems.co.za/ups_products/vision-800-2000va/
- Automatic Voltage Regulation — depends_on, source: https://standbysystems.co.za/ups_products/vision-800-2000va/
- Offline Topology — relates (lower-tier alternative), source_status: inferred
- Online Double-Conversion — relates (higher-tier alternative), source_status: inferred