Provides the highest level of protection against all power disturbances (noise, spikes, frequency shifts), but is more expensive and slightly less energy-efficient due to constant double conversion. Summary Comparison Table Off-line (Standby) Line-Interactive On-line (Double Conv.) Transfer Time 0 ms Voltage Regulation None (only on battery) Basic (via AVR) Perfect (constant) Best Use Case Home computers Small offices, workstations Servers, data centers Cost
Depending on the architecture of the UPS, there are three primary operational schemes: , Line-Interactive , and On-line (Double Conversion) . 1. Off-line (Standby) Scheme This is the simplest and most common scheme for home PCs.
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 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.
An evolution of the standby UPS, often used for small office networks. Provides the highest level of protection against all
The UPS passes utility power directly to the connected equipment while simultaneously charging the battery.
Better protection against brownouts than Off-line models, with a reduced frequency of battery use, extending battery life. 3. On-line (Double Conversion) Scheme Off-line (Standby) Scheme This is the simplest and
Activates when utility power fails completely or fluctuates beyond the AVR's corrective range.