Main Components

1. All UPS systems have three main parts: rectifier, battery and inverter. The rectifier changes AC power to DC power so that battery can store it. The battery stores power for use when there is a power trouble. The inverter changes battery DC power into AC power for tools and gives continuous power to PC for as long as battery gives uninterrupted power to inverter.

Power Wave Forms

2. Square wave, sine wave and quasi-sine wave are the only wave forms utilized by UPS systems for microcomputers. The inexpensive waveform to give is square wave and this is wave form utilized for offline UPS systems. The offline UPS systems are only meant for temporary use. The battery power will last for 10 to 15 minutes. After that tools will shut down if main power supply is not accessible. The square wave will injure tools if utilized continuing but for temporary utilize there is no problem. The 10 to 15 minutes of UPS power must be viewed as a chance to save files and documents if system shuts down.

Off Line UPS

3. An offline UPS system straight attaches the PC tools to outside AC power line. The battery and inverter are idle until wanted. When there is a power line trouble battery and inverter automatically come on to produce AC power for attached tools. When line returns to normal the attached tools automatically switches back to AC power line if battery has not run out of power earlier. The switchover must take no more than four milliseconds. If switchover takes longer than that most electronic tools will shut down. These are the least costly range of UPS and are intended only for home and/or small office utilize.

Types of Power Disturbances

4. There are nine types of power disturbances for a UPS to hold. The most general are power outage, power surge and brownout. Less common are power sag (temporary under voltage); over voltage (improved voltage extended period of time); line noise (alterations superimposed on power wave form); frequency (differences of power wave form); switching transient (below voltage or over voltage for some nanoseconds); and harmonic distortions (multiples of power frequency superimposed on wave form).

Choosing a UPS

5. The two key ratings to go by when selecting a UPS unit are volt amp (VA) and wattage ratings. They tell you maximum load UPS is able of handling. Another factor in selecting a UPS is amount of run time accessible when power fails. This will be a job of load that is plugged into UPS, the lighter the load the longer the run time. With an offline UPS system what you want is sufficient time to save data and files and power down your PCs smoothly