Low cost and high efficiency, but features a short "switching delay" (typically 4–10 ms) and no voltage regulation in normal mode. 2. Line-Interactive Scheme
Better protection against brownouts than Off-line models, with a reduced frequency of battery use, extending battery life. 3. On-line (Double Conversion) Scheme shemy raboty ibp
Similar to Off-line, but includes an autotransformer (AVR - Automatic Voltage Regulation). This allows the UPS to boost or lower incoming voltage without switching to battery power. Low cost and high efficiency, but features a
When voltage falls outside a specific range or fails entirely, a mechanical switch transfers the load to the internal battery and inverter. Low cost and high efficiency