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A Question About Bridge Rectifiers


By healerenergy, Section Wind
Posted on Fri Oct 27, 2006 at 07:23:19 AM MST
Has anyone tried

Has anyone tried to connect bridge rectifiers in series on the dc side of multiple ac circuits to get a desired voltage? It should be possible like connecting batteries together in series.
A Question About Bridge Rectifiers | 7 comments (7 topical)

Re: A Question About Bridge Rectifiers (3.00 / 0) (#1)
by drdongle on Fri Oct 27, 2006 at 05:38:39 AM MST

This is what is done with the "jerry rigged" alternators.
search the board for "jerry rigged"
Carpe Vigor, Dr.D


Re: A Question About Bridge Rectifiers (3.00 / 0) (#2)
by Opera House on Fri Oct 27, 2006 at 05:53:52 AM MST

What do you mean series?  A modular bridge rectifier voltage can be be doubled to form a SINGLE diode using only + and - terminals.  


Re: A Question About Bridge Rectifiers (3.00 / 0) (#3)
by Titantornado on Fri Oct 27, 2006 at 10:36:11 AM MST

I think he means like this:

Jerry rigged is usually paralleled rectifiers, not?

Rod

[ Parent ]



Re: A Question About Bridge Rectifiers (3.00 / 0) (#4)
by alancorey on Fri Oct 27, 2006 at 11:12:14 AM MST

If the AC sources aren't in phase (or the same frequency) you might need to add some filter capacitance across the DC outputs.  Otherwise the positive peaks of one AC source won't line up with positive peaks of the other.  Bridge rectifiers don't output clean DC, just the positive and negative peaks of the AC input.  Adding capacitance makes it more like putting DC sources in series, and they can add up that way.  If you're rectifying something in the KW range the capacitors will need to be quite large.   Capacitors also fail sometimes...

 Alan



Re: A Question About Bridge Rectifiers (3.00 / 0) (#6)
by Ungrounded Lightning Rod on Fri Oct 27, 2006 at 04:27:54 PM MST

Additionally, serising the rectifiers adds their voltage drops.  Since you're probably doing this because your voltge is low in the first place, doubling or tripling your rectifier losses is a drastic loss of energy.

It's something you only want to do if you can't rewind or reconnect the generator to have about the right voltage in the first place.

[ Parent ]



Re: A Question About Bridge Rectifiers (3.00 / 0) (#5)
by alcul8r on Fri Oct 27, 2006 at 03:39:52 PM MST

It can work.  Make sure you don't have a common ground or any other commons between your AC circuits.

The voltage you get may depend on phasing of the AC.  The caps mentioned elsewhere in this thread might help.
alcul8r KansasWind.com



Re: A Question About Bridge Rectifiers (3.00 / 0) (#7)
by healerenergy on Tue Oct 31, 2006 at 06:35:46 PM MST

Hey all thank you for the help my project should get going as soon as my stuff gets here.
Energy comes from many Sources the trick is knowing how to tap into it.


A Question About Bridge Rectifiers | 7 comments (7 topical)
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