Protect your Sensitive Electrical Devices with On-line UPS Systems

An uninterruptible power supply (UPS) is an electrical device that provides continuous power to a load in the event primary power source fails to do so. Generally, this primary power source is the mains power which is an alternating current power source. UPS systems are different from the emergency power systems in the regard that they provide virtually instantaneous power supply once the mains power fails. UPS systems & accessories make sure that the load connected to them is not subjected to these power disruptions.

There are three common types of UPS systems available in the market: Offline, Line-interactive and On-line. All of them use different working mechanisms and hence, are useful in different environments. Most of the times the power range determines which type of UPS system & accessories will be best suited for performing a particular task.

Both, Offline and Line-interactive UPS systems, make use of power transfer switches to change between power mains and secondary power source. An on-line UPS system, however, does not require the use of power transfer switches as the battery is always connected to the inverter. This allows instantaneous switching of the load from the mains power to the battery.

It is also known as a double conversion power supply as it first converts the AC input that may have distortion, spikes and other power problems into DC. This filtered DC is then converted back to stable AC which is fed to the connected load. This AC output may have frequency different from the one which was initially fed to the system. This distortion free AC output cannot be achieved with the Offline and Line-interactive UPS systems.

The rectifier, the battery and the inverter in this online system design are all interconnected. As soon as there is a power disruption, the rectifier goes out of the circuit and the battery starts to power the inverter for supplying continuous uninterrupted power to the attached load. Once the mains power appears again, the rectifier comes back to the circuit and starts to take most of the load and connects to the inverter as well as start to charge the battery at the same time.

On-line UPS is best suited for those places where electrical isolation is of paramount importance or for equipment that are extremely sensitive to voltage fluctuations. Data centers need continuous power for performing critical operations and power disruption for even few seconds can be highly detrimental. Online UPS is perfect for such applications because of its near instantaneous conversion ability.

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Created on Dec 31st 1969 18:00. Viewed 0 times.

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