Online And OffLine UPS

[sohel]

I want to know  about Online And OffLine Ups, what the diffarence .

 

[sphinx]

i would say that an online UPS is that type that allways is on and makes your power no matter of if power in is good or bad, in case with offline it goes on when the AC is low or is lost then it starts to deliver your power

/sphinx

[sphinx]

i remebered this as well

one case u might consider to use an online UPS is when u get lots of spikes or other kinds of noice on the incoming
AC or it can also be an unstable AC in certain areas or if u have equipment thats very picky with a clean AC input.

last but not least online UPS's are also more expensive compared to offline type

[ambot]

A more complete discussion is in this wikipedia article. http://en.wikipedia.org/wiki/Uninterruptible_power_supply

[sohel]

"Line-interactive
Line interactive UPS units are designed so the power input, a transformer with rectification circuitry, is connected directly to circuitry to charge the battery and to the inverter that is always connected to the output or load of the UPS. The transformer required is usually significantly larger than the transformer used in standby systems, adding weight and bulk to the UPS, because the load on the UPS is basically connected directly to the input and therefore the transformer must be large enough to provide sufficient real power to accommodate the load, with some extra capacity for overloads and power losses in the charging and inverter systems. When line power is present, the charging circuitry, which basically consists of a transformer and rectifiers or diodes to change the alternating current (AC) to direct current (DC), connects to the inverter which converts the DC current back to AC current and connects to the output or load. When utility power fails, the input to the inverter instantly changes from the input transformer and circuitry to the battery and provides power to the load. This design provides better filtering than a standby unit because the input transformer and circuitry is always connected to the inverter that is always connected to the load.

Line interactive units typically will incorporate an automatic voltage regulator(AVR). AVR allows the UPS to effectively step-up or step-down the incoming line voltage without switching to battery power. This allows the UPS to correct most long term over-voltages or under-voltages without draining the batteries. Another advantage is that it reduces the number of transfers to battery which extends the lifetime of the batteries.

Line-interactive UPS units are the most common design for units in the 0.5 kVA to 5 kVA range. They are typically used in small server environments"


i have two design one for true sinewave online with IGBT , its need 180V dc which charge from direct 220 ac via semikron MD6BKW4112 and filtering cap 4700/400V. its ok but another one true sinewave with pic 16f72 /20MHz . i want to charge one or two (12v or 12V*2 / 120Amp or 120Amp*2 Battery) from another charger. ups alwayes run from battery and battery charge from another way, it will reduce cost also. anyone can help me? to build charger. then it will called online ups. 

thanks

[Ret12_12]

Here it has a project for charger and maybe you can catch the idea how it works

http://www.oshonsoft.com/picchargerlcd.html