UPSToday. - After we are introduce you about general Uninterruptible Power Supply (UPS) systems, know you should know that there are two kinds of UPS, these are Online and Offline Uninterruptible Power Supply system.
In here we will give you global description about Online and Offline Uninterruptible Power Supply (UPS) Systems according Circuitstoday site that supported with block diagram to make you easy understand about these kinds of UPS.
A. Online UPS
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| Figure 1. Online UPS Block Diagram (Source: Screenshot of Circuitstoday) |
In case of On-line UPS, the battery operated inverter works continuously whether the mains supply is present or not. Triac T1 is on for all the times while Triac T2 has been provided to bypass the UPS inverter, only when a fault develops in the UPS inverter. When the mains supply fails, the UPS supplies power only until the batteries get discharged. However, once the mains power resumes, the batteries will get charged again. The switching times of these supplies is considered to be zero. Usually sealed maintenance free batteries are used and the running time of the inverter is low (approximately 10 to 30 minutes).
B. Offline UPS
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| Figure 2. Offline UPS Block Diagram (Source: Screenshot of Circuitstoday) |
In the case of Off-Line UPS, the inverter is off when the mains power is on and the output voltage is derived directly from the mains. The inverter turns on only when the mains supply fails. Its switching time is less than 5 ms. These UPS are generally used with PCs or computers or other appliances where a small duration (5 ms or less) interruption in power supply can be tolerated. Usually, sealed batteries or lead-acid batteries are used. The running time of these supplies is also low (about 10 to 30 minutes).
Addition information that Uninterruptible Power Supply (UPS) Systems to protect a sensitive system from power losses and blackouts, an alternative power source is required that can switch into operation immediately when disruption occurs. An interruptible power supply (UPS) is just such an alternative source. A UPS generally consists of a rectifier, battery charger, a battery bank and inverter circuit which converts the commercial ac input into dc suitable for input to the battery bank and the inverter. The rectifier should have its input protected and should be capable of supplying power to the inverter when the commercial supply is either slightly below the normal voltage or slightly above.
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Uninterruptible power supply are really great help for every one! In the Philippines, the best uninterruptible power supply are bought from Panther.
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