The operational mode is "mains power and electrical equipment are isolated; the mains power does not directly supply electricity to the equipment." Instead, upon reaching the UPS, it is converted to DC power, which is then split into two paths; one is converted back to AC power to supply the electrical equipment. When the quality of the mains power supply is unstable or during a power outage, the battery transitions from charging to supplying power until the mains power returns to normal, at which point it resumes charging. "The UPS is fully involved throughout the entire process of electrical usage." Its advantages include output waveforms that are the same as the mains power—sine waves—and they are pure with no noise, unaffected by the instability of the mains power. It can supply power to "inductive loads" as long as the UPS output power is sufficient, and can supply any equipment that uses mains power.
UPS maintains its inverter in operation continuously, converting alternating current from the power circuit into direct current and then transforming this DC power into high-quality sine wave AC using high-quality inverters for computer output. The main functions of an online UPS during power supply are voltage stabilization and prevention of electrical noise interference; during power outages, it uses a backup DC power supply to power the inverter. As the inverter is always operational, there is no need for replacement intervals, making it suitable for applications with strict power supply requirements. One significant advantage of an online UPS over a standby UPS is its long power supply duration, typically several hours, with some models lasting up to a dozen hours. Aviation ground power 2, 36V aviation power supply 1, 400HZ variable frequency power supply 7, 115/200V power supply 2, 27V DC power supply 5, 400HZ power supply 12, aviation power supply
