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Registered Member #1394
Joined: Sun Mar 16 2008, 06:18PM
Location:
Posts: 111
I was wondering, can you do full wave rectification straight from the 115v AC wall plug to get 115 DC? Assuming I have diodes rated for the voltage and the current.
So far I have only done it with a small transformer, 115v AC in 6v AC out then I did full wave rectification to get 6v DC but I don't want to trip the breaker or mess up good diodes trying to hook it up to the wall if its not possible.
Registered Member #396
Joined: Wed Apr 19 2006, 12:55AM
Location: Pittsburgh, PA
Posts: 176
Rectification is definitely possible from a wall outlet but you will actually get sqrt(2)x 120v = 170VDC out. What kind of load are you looking to run? Mains power is not current limited so you will need to be careful not to short anything and always limit the current to the ratings of you diodes and circuit breakers.
Registered Member #540
Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
You can rectify the line voltage but like Billybobjoe said, you don't want to short anything. Also you don't want to come into contact with any of the power leads because they are not isolated from the mains.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
If you use filtering caps after the rectifier, make sure you use some inrush current limiting or you can blow your diodes/switch or trip the breaker...
If you do not use any filtering then you'll indeed get a voltage with 120V DC RMS value, but it will have the 170V peaks.
Registered Member #1262
Joined: Fri Jan 25 2008, 05:22AM
Location: Maryland, USA
Posts: 451
I've had a lot of sucess with two AC "wall warts", one stepping 115VAC down to a low voltage and the other stepping it back up again. Then full wave rectification. I've use the output from a 230VAC wart full waved for cap charging. Using this method the current is limited quite well, however it is somewhat lossy. This can work really well if you need less than 20 watts and dont care about some power losses to the cores...
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Question about full wave rectification???
