The request for "shemy raboty ibp" (schemes of UPS operation) refers to the different functional modes of an , known in Russian as ИБП (Источник Бесперебойного Питания) .

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

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.