Single phase bridge rectifier

Discussion in 'Homework Help' started by jobu180, Feb 5, 2009.

  1. jobu180

    Thread Starter New Member

    Nov 1, 2008
    7
    0
    Hello,

    Looking for some help with the following problem:

    A single phase bridge rectifier output voltage is |118*1.414*sin(120*pi*t). Find the RMS value, period, and the DC component of this voltage.

    I have the RMS (118 V) and period (1/60 seconds). I'm struggling with the DC component. Any ideas?

    Thanks
     
  2. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    Do you mean its input is 118*1.414*sin(120*pi*t)?
     
  3. bertus

    Administrator

    Apr 5, 2008
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  4. jobu180

    Thread Starter New Member

    Nov 1, 2008
    7
    0
    Nope. The problem reads output voltage...
     
  5. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    The output of a rectifier is not a sinewave but anyway. The DC voltage of a full wave rectifier equals:

    Vdc=2*Vm/pi

    where Vm is the peak output voltage
     
  6. jobu180

    Thread Starter New Member

    Nov 1, 2008
    7
    0
    Mik3 Thanks. I know that's why I'm confused.

    Bertus, thank you for the link. Very helpful.
     
  7. Cabwood

    Member

    Feb 8, 2009
    20
    0
    There's a modulus bar at the beginning of the expression, but not at the end. I think it should be:

    | 118*1.414*sin(120*pi*t) |

    Then the question makes sense, and the output is indeed as expressed.
     
  8. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    In this way yes, it is correct.
     
  9. loudteeshirt

    New Member

    Oct 10, 2009
    1
    0
    Hi..I am new and found this really great forum. Thanks

    I need help on my church guitar amp on the power transfomer. Here is the line :

    Main AC input 220AC -->power transformer --> single phase rectifier-->output 22Vdc.

    The problem is I dont know what is the power transformer's step down voltage? Why it does not say any info on the transformer plus its already been thrown away. I have attached the schematic of the amp.

    Many thanks.
    Jimmi
     
    Last edited: Oct 10, 2009
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