Center tapped transformer rectifier question

[fester]

Re: Center tapped transformer rectifier question

yes it is but if you dont need big current,it is also the solution..

[Dannyx]

Re: Center tapped transformer rectifier question

something like this

I have seen that before, but I believe that's a half wave rectifier.

[fester]

Re: Center tapped transformer rectifier question

something like this

[Dannyx]

Re: Center tapped transformer rectifier question

Then I guess the only option is to have 4 diodes (a full bridge rectifier) for the other winding as well (can't mix them together): AC side of said rectifier goes to the center winding and one of the remaining ones and the output will be 18v DC.

[fester]

Re: Center tapped transformer rectifier question

Or if you accept more ripple on output,you can make two separeted half-wave rectifiers with lower winding as a ground

[Dannyx]

Re: Center tapped transformer rectifier question

It's obviously wrong given that two people so far have sarcastically suggested trying it out, so I'm not gonna do it - can't really afford to scrap components like that Let's take it step by step then, since my brain hurts when working with center tappers like these....step one: rectify the 40v output - no problems here, I'm positive....pun intended

[fester]

Re: Center tapped transformer rectifier question

you cant achieve that,only if you have separate grounds for every voltage and you dont plan to connect it together. Maybe the simplest thing will be using of some voltage regulator with higher allowed max. voltage on input

[budm]

Re: Center tapped transformer rectifier question

Build it and find out for yourself if your theory is correct.
Look real close at your drawing.

[stj]

Re: Center tapped transformer rectifier question

follow your current paths - boom.
your shorting the windings with the diodes!!

[Dannyx]

Good day folks. I'm going to use a center tapped UPS transformer for a project and would like some advice on how to rectify its output. The two windings are 18v each and I already use those on the AC legs of a bridge rectifier to get around 40v out which is fine (the center tap is floating at this point), however a separate part of my project requires a lower voltage of just 18v, so how can I achieve that ? Obviously I could just place another bridge rectifier between the center tap and one of the legs, but that's not very space-efficient, so I was thinking of using 2 diodes on the center tap and other 2 already inside the rectifier....complicated I know, so I put together the rather horrible schematic to try and explain how I see it. Is this correct ?