# AC to DC conversion project

Discussion in 'The Projects Forum' started by frisbee4all, Feb 22, 2009.

1. ### frisbee4all Thread Starter Member

Feb 22, 2009
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Hey guys,

I am a mechanical engineer working on a senior design project. Basically, I need to take a varying input from an AC generator/motor/alternator and convert it into a smooth DC operation. So far I have read up to the diodes/rectifiers but I'm still not sure 100% where to go from there. Also, does anyone know if there are equations that relate the input rpm of a motor to its output voltage? Thanks

2. ### beenthere Retired Moderator

Apr 20, 2004
15,815
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The RPM relates to output frequency. The output of a coil relates to the number of turns in the coil and the number of lines of magnetic force cutting across it.

Her is a link to the Wikipedia article - http://en.wikipedia.org/wiki/Electrical_generator.

Any physics text treats on the subject.

Apr 5, 2008
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4. ### frisbee4all Thread Starter Member

Feb 22, 2009
13
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Thanks guys, thats pretty much where I'm at right now I'm just trying to get rid of those ripples caused by the capacitor. Any one know how a voltage regulator works or which one to use, equations are preferable. Another thing that I'm having a problem obtaining is the actual output equations of the generator. Do the generators have an AC-DC converting circuit built into it? Or would I need to add a rectifier circuit after it?

Apr 5, 2008
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6. ### frisbee4all Thread Starter Member

Feb 22, 2009
13
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Thank Bertus, that pdf file was exactly what I was looking for, it took me about 3 books to get what that file said, plus the file simplified the voltage regulator step. I appreciate your guys help!

7. ### rajeshbro New Member

Feb 8, 2009
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You will need a rectifier ( full bridge) to convert AC to DC then Smoother to smooth out pulsing DC ouput from the rectifier, then a chopper to make output voltage from the smoother into a constant voltage output. That pdf attached by bertus is pretty good. Kudos to him.