ups center tape transformer

Discussion in 'General Electronics Chat' started by green90, Apr 3, 2016.

  1. green90

    Thread Starter New Member

    Sep 3, 2015
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    why ups center tape transformer is (7.6v-0v-7.6) while i has 12v battery ???
     
  2. GopherT

    AAC Fanatic!

    Nov 23, 2012
    6,025
    3,789
    That should be "center tap" transformer.

    Next. 7.6 for each side is 15.2V total AC (as RMS voltage).

    Once the 15.2 v is rectified and smoothed with decoupling capacitors, with minimal load, the DC should be equal to the Peak-to-peak (minus rectifier diode drops). Or, RMS voltage x 1.414 or about 21 volts.
     
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  3. green90

    Thread Starter New Member

    Sep 3, 2015
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    thank you ... but in inverters cct always use 12v-0v-12v while in ups (7.6v-0v-7.6) while in both case using 12v battery
    Very-simple-50-watt-inverter-using-MJ2955.png
     
  4. tcmtech

    Well-Known Member

    Nov 4, 2013
    2,034
    1,653
    Read up on Pulse Width Modulation and how its used as a voltage regulation method and you will understand why.
     
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