What's an offline UPS and is it better than online UPS？
March 12,2020
What's an offline UPS? What's the difference between offline UPS and online UPS? Many people may be confused about the different types of UPS. However, you will BETTER understand the concept after learning the different types of UPS topologies. In this article, we will show you the definition，working principle, block diagram and other details of offline ups
Offline UPS, sometimes described as standby power supply (SPS) are systems where the load is fed directly from the raw mains during normal operations instead of the inverter outputs. When the mains supply fails or fluctuates outside of the UPS's operating window, a relay connects the load to the inverter output (resulting in a 4-8ms transfer time). In normal operation, with mains supply present, both output voltage and frequency will track the input voltage and frequency respectively.
Look at the offline UPS diagram below，you will understand why people also call it a "backup" or stand-by UPS.
The key difference between Online UPS and Offline UPS lies in their work. An Online UPS supplies the AC power through a rectifier and inverter circuit even when the AC mains power is available.
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