I am suppose to design a full wave rectifier by SCR. But I have no idea what it is, someone helps me to get some ideas.

 

SCR: http://www.allaboutcircuits.com/vol_3/chpt_7/5.html

Full Wave Rectifier: http://www.allaboutcircuits.com/vol_3/chpt_3/4.html

Making a full wave rectifier from SCRs doesn't make much sense, unless one is trying to control the bridge o/p power with an i/p signal. Are you sure you understood the assignment correctly?

 

I'll bet they are talking about an SCR controlled full-wave rectifier.

 

If you are making a high-current regulated power supply with a variable voltage output, it is good practise to have a preregulator ahead of the output regulator. Using the SCR's to keep voltage on the filters about 2 volts above the regulated output means the passers can run close to saturation and avoid ohmic heating.

 

Interesting! I had no idea. Thanks!