What is uninterruptible power supply (UPS) ?

This device that allows the computer to keep running for at least a short time after the primary power source is disconnect . It also provides protection from Power Surge.

A UPS has a battery that "kicks in" when the device experiences electrical damage from the primary source. If you are using a computer when UPS informs you of the loss of electricity, then you can save any data you are working on and leave the graceful before leaving the secondary power source (battery) it happens. When all the power is over, then any data on your computer's random access memory (RAM) is erased. When a power surge occurs, a UPS can interrupt the Surge so that it does not damage the computer.

U.P.S. in the data center

Each UPS converts incoming AC to DC through a modifier, and converts it back with an inverter. Batteries store energy to use in a utility failure. The power of bypass circuit routes around the rectifier and inverters, the IT utility runs on incoming utility or generator power. International Electro technical Commission (IEC) adopted more technically descriptive terminology in IEC Std.

The voltage and frequency independent (VFI) UPS system is called dual or double conversion because the incoming AC is rectified in DC to charge the battery and inverter drive. Inverter creates stable AC power to run IT equipment.

When the power battery fails, the inverter starts, which continues to run the information technology (IT) load. When the power is restored, either by the utility or a generator, the refiner delivers the direct current (DC) to the inverter as well as recharge the battery. Inverter runs full time. Utility input is completely different from the output, and the bypass is used only for maintenance protection or if there is an internal electronics failure. Since there is no break in power given to IT equipment, therefore vacuum fault interpreter (VFI) is generally considered to be the strongest form of UPS. Most systems synchronize output frequency with input, but this is not necessary, so it is still eligible as frequency frequency .

Every power conversion causes the loss, so waste energy is historically considered to be the price of the last reliability. The latest VFI systems claim more efficiency than 96% on almost all loads. Voltage Independient (VI), or True Line Interactive UPS has a controlled output voltage, but output frequency similar to the input. Frequency freedom with power is rarely a concern in developed countries. Utility power directly feeds the output and IT equipment, and the rectifier keeps the battery charged. Inverter is similar to output, compensates for voltage dips and acts as an active filter for voltage spikes and harmonics. Rectifiers and inverter damage are only occurring when the incoming electricity fluctuates. Flywheel and motor / generator set are also eligible as VI.

When the incoming power fails, or the voltage gets out of the range, bypass quickly disconnects from the input and the battery runs inverter. When the input power is restored, then bypasses the input again, charging the battery again, and maintaining the output voltage. UPS sellers who use the same power sources claim to be the loss of reliability. The result is approximately 98% energy efficiency.

Voltage and frequency dependent (VFD), or standby UPS, is similar to Operationally VI and sometimes by accidentally called line interactive. Inverters are discontinued in traditional VFD systems, so it can take up to 10 to 12 milliseconds (ms) in generating electricity. This brake can crash the server, so that the VFD can be bad for the UPS data center.

After being activated in the new VFD concepts, the inverter output power is within 2ms. Bypass is normally engaged, such as with VI, so the devices are operated directly with utility or generator. Since the inverter is not working, until the power fails, there is no voltage control or power consumption, which can increase the capacity up to 99%. Outside the boundary, bypassing the input from the power failure or the voltage output opens the bypass switch; Inverter starts working from the battery. The rectifier is big enough to keep the battery charged.