Help with 3 phase and 6 phase half wave rectifier

Discussion in 'Homework Help' started by darthfader, Dec 19, 2009.

  1. darthfader

    Thread Starter Member

    Jul 26, 2009
    12
    0
    How can we find the average and rms value of 3phase half wave rectifier?

    I know that the answer for the average value is \frac{3sqrt(3)V_m}{2pi}\ which is approximately 0.827Vm.

    My attempt to solve this problem is:

    \[<br />
\left[ {\frac{3}{{2\pi }}} \right]\left[ {\int_0^{\frac{\pi }{3}} {\cos \omega td\omega t}  + \int_{\frac{\pi }{3}}^{\frac{{2\pi }}{3}} {\sin \omega td\omega t} } \right] = (1 + \frac{{\sqrt ( 3)}}{2})\left( {\frac{3}{2\pi}} \right)<br />
\]

    which is obviously incorrect..
    I suspect that the period that i got is wrong.. thanks..

    PS: Sorry for my crappy LaTex
     
  2. darthfader

    Thread Starter Member

    Jul 26, 2009
    12
    0
    oh, sorry, i got it.. i made a mistake, i overlooked that the sine function i integrated is phase shifted by pi/6.. :D i got the correct answer after doing this correction..
     
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