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Post by Deleted on Nov 27, 2008 7:24:04 GMT -8
Using a 1:1 isolation transformer is it possible to double the 115v 60 cycle to a 200v+ supply using diodes and use it as an a B+ supply?
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Post by Gary Lecomte on Nov 27, 2008 8:03:57 GMT -8
A 1:1 Transformer Doesn't Increase Voltage, it just isolates.
But Diodes can be used as a Doubler to increase voltage.
A Doubler circuit with suitable filter caps will give about 2.8 Times the RMS voltage.
115 volts Rectified will give about 160 VDC.
115 volts with a Doubler and Filter caps will give about 320 VDC.
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Post by Deleted on Nov 27, 2008 8:53:54 GMT -8
so to get 320 volts what should the two capacitor values be for the basic doubler? I plan on using ultra fast diodes.
If I knew how to upload the schematic I would but it is a basic 2 diode doubler with two capacitors.
THe one to one transformer is used for isolation only. I have an old Line Isolation Monitor supplying my work station.
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Post by Gary Lecomte on Nov 27, 2008 11:37:20 GMT -8
so to get 320 volts what should the two capacitor values be for the basic doubler? I plan on using ultra fast diodes. If I knew how to upload the schematic I would but it is a basic 2 diode doubler with two capacitors. THe one to one transformer is used for isolation only. I have an old Line Isolation Monitor supplying my work station. Sorry,I have No time now to give you a Schematic. But WHY "Ulta Fast Diodes"? Ultra Fast Diodes are made for "High Frequencys", NOT 60 Hz. And What is your Expected DC Output Current? |
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Post by Deleted on Dec 8, 2008 15:46:39 GMT -8
Well, actually if the transformer is truely 2 windings, you can put them in series, feed 110v from one side to the center and rectify the whole winding with a voltage doubler you should get 600+ volts dc........but, no isolation. Sounds dangerous? Consider this; millions of "ac/dc" broadcast radios were made in the '50's. Not that many people were killed! I believe that's called a auto-transformer.
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Post by Gary Lecomte on Dec 8, 2008 16:13:02 GMT -8
Basically you are correct.
Most Auto Transformers are just a Single winding with a Tap on the winding.
The input voltage connects to one end and the tap.
The Output connects to Both ends.
An Auto transformer can Double, Tripple or increase a voltage by almost Any amount.
Some Stun Guns also use Autotransformers for T1 and T2.
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Post by Deleted on Apr 19, 2009 10:25:40 GMT -8
ALSO A BOOST TRANSFORMER COULD BE USED. EG. IT IS A TRANSFORMER WITH A FEW COILS WITH ALL THE WIRES STICKING OUT. IF EACH COIL IS RATED FOR 120 VOLTS OUT PUT, YOU CAN CONNECT 1 INPUT AND CONNECT ALL THE COILS IN SERIES THEN ALL THE OUT PUT VOLTAGE WILL ADD UP.
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