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A UPS is one which automatically powers the electronics or electrical appliances in case of a power outage. Though, most UPS systems carry out functions such as voltage regulation and deal with noise and harmonic distortion. The term 'online' here comes implies that the rectifier and the inverter are always being used, even when there is enough mains power. This isn't the case in the Offline UPS systems.
The biggest advantage with an on-line system is that, except under extraordinary conditions, it works whether the main supply is present or not. An online UPS system is one where the UPS output is supplying current to the load at all times. This is just opposite to the older and cheaper style that only switches the UPS output to the load when the main supply fails. This causes a brief pierce that can reset the computers and can create interference.How it works
With an online system the mains are continuously charging current to the batteries and the UPS output is generated from the batteries therefore when the mains supply fails there is no switching of the output voltage. This system offers extra protection from brownouts and voltage spikes on the main line. In Online UPS, the load is always connected to the inverter output in both of the cases, whether normal power supply is available there or not. This is the most advanced and most costly UPS. The inverter continuously provides clean power from the battery, and the computer paraphernalia never receives power directly from the AC outlet. However, online units contain the cooling fans, that makes noise and it may require some Online UPS. It gets power AC converted to DC, then the DC source stored to Battery at power supply on mode when power fails, the DC source gets changed to AC by inverter so output power is having without noise.
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