subject: Online Ups [print this page] The Online UPS, sometimes called a true UPS, is the best type one can buy. Paradoxically, it is both very similar to and totally opposite to the least-expensive type, the standby UPS. It is very similar to it in that it has the same two power sources, and a transfer switch that selects between them. It is the exact opposite from the standby UPS because it has reversed its sources: in the online UPS the primary power source is the UPS's battery, and utility power is the secondary power source. There is another key advantage to having the equipment running off the battery most of the time: the double-conversion process totally isolates the output power from the input power. Any nasty surprises coming from the wall affect only the battery charger, and not the output loads.
Aside from the cost, a disadvantage of the online UPS is its inefficiency. All the power going to the loads is converted from AC to DC and back to AC, which means much of the power is dissipated as heat. Furthermore, this is happening all the time, not just during a power failure, and while running equipment that draws a lot of power. To combat this shortcoming, a new design called a delta-conversion online UPS was created. Delta is the scientific term often used to refer to the differential between two quantities. In this design, the battery charger is replaced with a delta converter. Instead of providing all of the output from the battery under normal circumstances, some of it is provided directly by the delta converter from the input line power. In the event of a power failure, the delta converter stops operating and the unit acts like a regular double-conversion online UPS, since the inverter is also running off the battery all the time.
Servo Voltage Stabilizers are the automatic voltage regulators. These Servo Voltage Stabilizers regulate the output power. It produces voltage output as per customers requirement. The absence of this stable input supply may create a problem in many types of equipment. Voltage supply conditions result in total breakdown of sensitive and sophisticated equipments. The basic use of Servo Stabilizersis to control voltage fluctuations in input voltage and provide with best output voltage to load. The servo stabilizer manufacturers in Delhi manufacture these stabilizers in such a way that they are very efficient, safe and control the fluctuations in better way.
by: Cleantrip
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