1. Online UPS: Online UPS is the most commonly used type of UPS, which integrates the battery and inverter into one chassis. During normal operation, an online UPS converts mains power into DC power, which is then converted into AC power through an inverter to supply power to the equipment. When the mains power is interrupted, the online UPS will immediately switch to battery powered mode to ensure that the equipment continues to operate. The conversion time of online UPS is very short, usually within a few milliseconds, so the protection effect on equipment is very good.
Working principle of online UPS power supply
2. Offline UPS: Offline UPS separates the battery from the inverter, and the inverter is responsible for converting the mains power into AC power to supply the equipment. When the mains power is interrupted, the offline UPS will immediately switch to battery powered mode. The conversion time of offline UPS is relatively long, usually ranging from a few seconds to tens of seconds. Offline UPS is usually used for devices that do not require high power quality, such as home computers, printers, etc.
3. Backup UPS: The backup UPS directly provides AC power to the equipment connected to the load. When power is lost, the backup UPS will change the position of the transfer switch. It connects the load to the battery backup path.