Re: rectifier
abdulhafeez said:
hi
What is the diffrence between a conventional full wave rectifier and a bridge rectifier ?
What do you mean "conventional full wave rectifier"?
I suppose you mean the rectifier combined with the transformer secondary winding with centered tap, right? (since there is no more circuit for full wave rectifier). I will call them CR and BR for short.
So, the differences are:
- CR needs only
2 diodes while BR needs
4 diodes.
- So the
voltage drop on the rectifier in CR case is smaller (1 diode drop = #0.7V) than BR case (2 diode drops = #1.4V). This is very important and must be paid attention when you use a low voltage system.
- The
reverse voltage applied on each diode in BR case is half of the CR one. You should pay attention on this when you use a high voltage system.
- BR needs the transformer with only 1 secondary winding with no centered tap while CR needs centered tap. So the transformer for BR is cheaper and is used with the higher
efficiency as the 2 winding halves in CR case are never symmetrical and only always conduct DC currents that makes transformer efficiency lower.
- Transformer with centered tap winding is more
expensive.
- Designing rectifier in BR circuit will help you find out
ready-made transformer much more easilier than designing CR one.
Hope that clear enough.
nguyennam