We from PAR Group take pleasure in introducing ourselves as manufacturers of UPS systems, Digital Inverters etc., our office is located in Calicut, Kerala.
A UPS is actually an inverter which changes within less than 2-4 milli seconds to battery converted power during a power failure and has regulated output voltage. These features are ideal for computers for data safety and proper functioning of PCs.
Inverter is an electronic equipment which converts DC power to AC power. As soon as power fails the inverter starts and generates AC power from DC battery power within 20 to 40 milli seconds. Inverters are usually used for lighting tubes, fans, TV's etc and usually does not have regulated output.
Home UPS combines the applications of both Inverter and UPS, which means it can be used for both lighting and PCs. The utility power is supplied in the form of Sinewave which is the best form of power for most of the household equipments, and a Home UPS should ideally have this feature.
In an OFFLINE UPS, the load is connected to the mains supply which is stabilized directly. The moment the power fails the load will be switched over to the output of the inverter. There is a definite switch over time in Offline UPS which can be between 5ms to 20ms. Upto 20ms, interruption in power will not be felt while using the computer because the SMPS input capacitor, will supply power to the computer.
An Online UPS works always from a floating DC voltage (of batteries). Batteries are parallely being charged when mains is present so that they do not get discharged at all. An ONLINE UPS has a charger which is called rectifier and an inverter section. So in an Online UPS the change over time is zero. In addition, a true Online UPS should have isolation between input and output and should have pure Sinewave output.
When computers are switched on initially it takes too much of power for a short duration (usually for few cycles of supply) and the UPS should be able to give such type of surge power to computers during switch on.
For optimum output, maximum efficiency, healthy performance and long life of the batteries, both the DC voltage of battery and Specific gravity of the acid in it should be built up gradually during charging. Conventional chargers are not capable of this where as a microcontroller or DSP based design with the right logic ensures these conditions and parameters.
Power factor of a product decides the efficiency and power consumption of that product. In conventional thyristor charger (rectifier) systems, PF may be normally 0.3 to 0.5 This means that a 5kva UPS will use more than 10kva, in most conditions. .
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