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Bridge Rectifier

Discussion in 'Beginner Electronics' started by Steve Lewinsky, Nov 22, 2003.

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  1. Im a novice and trying to understand the logics here. My monitor has the
    120v AC line coming into a Full bridge rectifier(4 Diode set) with 3 .01
    filter caps. Why do I get 183volts DC out the other side and not 120volts
    DC?
    If a picture is required let me know
     
  2. JeffM

    JeffM Guest

  3. Jimmy

    Jimmy Guest

    Typically the unloaded output voltage should be 1.414 * RMS input voltage in
    your case 120 volts. Sounds like you have a little more than 120.
     
  4. scada

    scada Guest

    The output of the bridge rectifier should go through some filtering that has
    large electrolytic capacitors. The unloaded voltage would be 1.414 * RMS or
    1.414 * 120 = ~170 VDC. The fact that you are reading 183 VDC shows that
    there is no load on the power supply! Something has open circuited, causing
    a no load condition.
     
  5. Jimmy

    Jimmy Guest

    The ~170 volts should be the open circuit voltage. 183vdc can only be
    accounted for by the fact the input is more than 120 or measurements are
    incorrect.
     
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