What is an Online UPS?On-line uninterruptible power supply definitionOnline uninterruptible power supply is a kind of equipment that can provide continuous, stable and clean power supply, mainly used in occasions with high power quality requirements, such as data centers, server rooms, medical equipment, precision instruments and so on.ComponentRectifier: Converts alternating current to direct current.Battery pack: Stores electrical energy to provide energy in the event of a mains interruption.I