Capacitor voltage

Discussion in 'General Electronics Chat' started by acstudent1, Mar 29, 2009.

  1. acstudent1

    Thread Starter New Member

    Mar 29, 2009
    1
    0
    Why is the voltage measured at the capacitor in a air conditioning unit greater than the original supply voltage?
     
  2. Mike2545

    Active Member

    Mar 26, 2009
    116
    3
    You need to use a higher rated capacitor in any application. A good general rule is 2 to 1.
    So if your circuit is running 12v use a 24v or higher rated cap. :)

    Mike2545
     
  3. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
    6,357
    718
    Often you are seeing the peak voltage if there is no load. With a rectified sinewave, that is roughly 1.4x the RMS voltage.
     
  4. kakin

    New Member

    Mar 24, 2009
    9
    0
    it could be a voltage multiplier (< wikipedia) or some circuit like that, dunno about air conditioners but maybe it uses something similar to get more voltage/ less current for a component.
     
  5. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    Because they don't manufacture capacitors with all possible voltage ratings one can use. There are some standard values and designers choose the most suitable for the design. If you use a lower value than the operating voltage it will blow thus they use the next higher value (at least).
     
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