# Help with 3 phase and 6 phase half wave rectifier

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

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 $\frac{3sqrt(3)V_m}{2pi}$/extract_itex] which is approximately 0.827Vm. My attempt to solve this problem is: $\[ \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)$$

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

PS: Sorry for my crappy LaTex

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.. i got the correct answer after doing this correction..