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Registered Member #4659
Joined: Sun Apr 29 2012, 06:14PM
Location:
Posts: 158
So I need a way to get about 300 volts DC from a wall outlet plug. I've looked at circuits for villard cascade/cockcroft-walton generator type circuits, or I could also get a transformer and step up the wall plug AC to 240-360 volt range, then rectify that current. What's the best circuitry for this?
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
transformer plus rectifier will probably charge the caps faster than the cockroft-walton multiplier, but the multiplier 'may' cost less, depending on what caps you get, etc.
Registered Member #4659
Joined: Sun Apr 29 2012, 06:14PM
Location:
Posts: 158
Ash Small wrote ... the cockroft-walton multiplier, but the multiplier 'may' cost less, depending on what caps you get, etc.
What are the requirements for the caps? all the diagrams of CW multipliers I see don't have any labels on the capacitors. Obviously I need a voltage rating of 300V or more, but what should the capacitance be?
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Hello,
As you only need a doubler, I'd start by looking for two biggest motor run capacitors you can find. They are common in junk like washing machines and usually about 20uF in europe - I assume they're about 40uF in US then.
Charging time depends on size of your bank too, if your bank is small then it might charge too fast for you to shut it off manually before it reaches over 300V in which case you might want to use smaller doubler caps (any will work as long as they are nonpolarized and rated for adequate voltage).
Registered Member #1525
Joined: Mon Jun 09 2008, 12:16AM
Location: America
Posts: 294
Yanom wrote ...
What are the requirements for the caps? all the diagrams of CW multipliers I see don't have any labels on the capacitors. Obviously I need a voltage rating of 300V or more, but what should the capacitance be?
You can use any capacitance in the voltage multpilier, but higher capacitance means more current, and a faster charging time. Here's a calculator that will show you the relationships involved. The best way to design this though is to get LTSpice (free) and design your whole circuit. Or if you want you can give me your specs and I'll run a sim for you.
I did not now the caps had to be non polarized I was able to build a very successful dubler using camera caps to charge my 450v bank from from 240v but maby that's why my charge resistor got so hot
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
I would rather use an isolating transformer with bridge rectifier than a doubler because the 300V circuit will be isolated from the ac line - safer - able to connect oscilloscope etc.
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Best circuit for getting 300ish VDC from 120VAC (wall outlet)?
