Semi controlled rectifiers

Discussion in 'General Electronics Chat' started by Tera-Scale, Jun 30, 2012.

  1. Tera-Scale

    Thread Starter Active Member

    Jan 1, 2011
    164
    5
    Below are the formulas for Vmean of three phase and single phase semi controlled rectifiers;

    Single Phase semi-controlled;


    V_{mean}=(\frac{V_{pk}}{\pi})(1+cos\alpha)

    Three phase semi-controlled;

    V_{mean}=(\frac{(V_{rms})3\sqrt{3}}{\sqrt{2}\pi})(1+cos\alpha)

    How can I subtract diode drop (0.7V) and SCR drops (1.2V) separately?
     
  2. crutschow

    Expert

    Mar 14, 2008
    13,014
    3,234
    An SCR is a Silicon Controlled Rectifier. ;)

    You just subtract the 1.2V forward drop of each SCR and 0.7V from Vpk for each diode that is in the conducting path.
     
  3. KMoffett

    AAC Fanatic!

    Dec 19, 2007
    2,574
    230
    I like "semi controlled rectifiers"...you can turn then on, but you can't turn them off. ;)

    Ken
     
  4. Tera-Scale

    Thread Starter Active Member

    Jan 1, 2011
    164
    5
    So, obviously this depends on the configuration of the diodes and SCRs. For the configuration attached I can just subtract (0.7V+1.2V) from the Vmean at the end. Therefore it is just simple as that. Attached are the formulas I attempted for a practical situation in my country.

    http://dc382.4shared.com/doc/3rwHGL1l/preview004.png
     
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