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4hv.org :: Forums :: General Science and Electronics
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Dirty unisolated mains battery charger, viable?

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Storken
Mon Jun 11 2012, 08:28AM
Storken Registered Member #1960 Joined: Thu Feb 05 2009, 11:57PM
Location:
Posts: 48
DDC: And having them in series to reach the needed 72v? Haven't hacked a psu yet, but it seems like a good way...
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Dr. Dark Current
Mon Jun 11 2012, 09:38AM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Sorry I overlooked the voltage, for some reason I was thinking 12V. Well, you would probably have a hard time finding such a PSU...
These UC384x current limited PSUs are easy to build, but of course it requires some basic SMPS design knowledge. You could modify a lower voltage one, it would mean rewinding of the transformer (and inductor for forward converter PSUs), but not really hard to do.
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Storken
Mon Jun 11 2012, 01:35PM
Storken Registered Member #1960 Joined: Thu Feb 05 2009, 11:57PM
Location:
Posts: 48
It looks like it can be turned up to 25V from 12V. Using -25 to +25v you can have 50v out. I don't have many mosfets, but enough pots, capacitors and resistors. Maybe I could find a way to turn it up to 35V.

Link2

Uzzor seems to have done his share of hacking ;) I'm still learning some more about this. My plans is to hack one or more PSU's for attaining needed voltage.
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Storken
Mon Jun 11 2012, 04:28PM
Storken Registered Member #1960 Joined: Thu Feb 05 2009, 11:57PM
Location:
Posts: 48
Well, I'm tempted to try a boost converter - the current limiting will lie in the PSU, and the boost converter will need to be shut down once the voltage is reached.

12VDC in, ~76VDC out.

3-4hour charge time will probably be on the long side - but it'll get it done.
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