Diode Rectifier Question

Discussion in 'The Projects Forum' started by biscuitownz, Feb 15, 2014.

  1. biscuitownz

    Thread Starter New Member

    Aug 9, 2013
    25
    0
    Hi all, I recently purchased a toroidal transformer that has 2 primary 115v (will be wired in parallel) and 1 120v secondary coil. My question is, when I rectified the voltage, what will it be at? I have this rectifier (http://www.alliedelec.com/search/productdetail.aspx?SKU=70016005#tab=overview).

    I ran a simulation with "Circuit Wizard" and it gave me 99v which doesn't seem right to me.

    Thanks.
     
  2. antonv

    Member

    Nov 27, 2012
    149
    27
    What were you expecting?

    It should be in the neighborhood of 120V (rms).
     
  3. biscuitownz

    Thread Starter New Member

    Aug 9, 2013
    25
    0
    Yeah, I was expecting it to be around there also. Which is why I wanted to make sure. :)

    Thanks!
     
  4. burger2227

    Member

    Feb 3, 2014
    190
    24
    No capacitor to even it out? Then you have rectified pulsating DC. That's what filters are for.
     
  5. #12

    Expert

    Nov 30, 2010
    16,355
    6,852
    Exactly. Then you have to learn whether the simulator displays average voltage, peak voltage, or something else.

    This isn't an electronics problem. It's a simulator problem.

    120 V RMS rectifies to 169.7 volts peak, minus about 1.4 V for the full wave rectifier. Add a capacitor to the output and the results will be about 168.3 V with a tiny load and about 169.7 with no load at all. Add a larger load and we'll start talking about formulas for the amount of ripple voltage included at the output.
     
    Last edited: Feb 15, 2014
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