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estimation of power dissipation of a resistor when R is very small?

Discussion in 'Homework Help' started by leodavinci90, Nov 15, 2016.

  1. leodavinci90

    Thread Starter Member

    Oct 22, 2014
    57
    4
    Question: if we have a
    single-phase full-wave controlled rectifier, ac supply with 50Hz and VS=220Vrms, R=100Ω.
    If I have a firing angle =33 degrees and a capacitor is shunted with R, analyse and estimate the resistor power dissipation for small values of C (the ignore smoothing effect), and for medium values of C and sufficiently large values of C (neglect output ripple)

    Answer:
    So I know that In any rectifier, the larger the value of any shunt capacitor, we will have a smaller DC voltage across R.
    To answer this fully should just use an example calculation such as:
    Vr = Vm/(2xfxRxC)
    and different ranges of Capacitors from say milli to micro to nano Farad?

    Is there another equation for power dissipation?
     
  2. leodavinci90

    Thread Starter Member

    Oct 22, 2014
    57
    4
    Sorry correction: the title of the thread is wrong
    1) small values of C
    2) large values of C--> we need to find V(forward voltage of two diodes)
     
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