Offline UPS Systems
The "Uninterruptable Power Supply" is also called as Standby Power Supply, since they stand by whilst the main power supply is working. These power supplies usually consists of inverters operating from DC storage source (like battery). In many applications like major computer installations, process control in chemical plants, hospital intensive care units continuous power supply is highly essential. In these applications, temporary power failure can cause a great inconvenience and economic losses. The UPS plays an important role in these situations.
There are various types of Uninterruptible Power Supplies available. Click here to know more about the Basics and Various types of UPS system. This post will explain about the Offline UPS system only.
The following figure shows the configuration of an offline UPS system. It is also known as Line-Preferred UPS or Passive Standby.