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?

 

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.

 

I like "semi controlled rectifiers"...you can turn then on, but you can't turn them off.

Ken

 

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.

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