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Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
With the specifications you've given, the transformer secondary will have to supply about 17mA to the multiplier - say 20mA when you throw in losses due to surface leakage and corona.
That's a couple of hundred watts. I don't think the LOPT would last very long.
Registered Member #1438
Joined: Sat Apr 12 2008, 12:57AM
Location: Canada
Posts: 218
Proud Mary wrote ...
With the specifications you've given, the transformer secondary will have to supply about 17mA to the multiplier - say 20mA when you throw in losses due to surface leakage and corona.
That's a couple of hundred watts. I don't think the LOPT would last very long.
How long approximately do you think it would last under a couple hundred watts? The LOPT will be immersed under mineral oil with proper vacuum removing of bubbles.
Also I'm curious to what would happen if the ZVS does not provide enough power for the multiplier. Will the Vripple just be very large because it doesn't have enough power to charge the multiplier capacitors before it drains?
I'm also going to guess that those diodes rated at 5mA would not be sufficient for this multiplier.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
I think that transformer will have no problems with 200 watts. Usually when the transformers are run with a symmetric load and a forward converter, the available output power is at least 2 times larger than with the halv wave rectifier like in a TV. The old unrectified, disc or cylinder-style transformers can supply several hundred watts this way. A friend ran one at 900 watts for a few minutes and it was fine.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Perhaps Dr Dark Current is right, Dragon. I would not have expected that a winding designed to pass, say 2 mA, would not overheat if 20 mA were drawn from it continuously, but have not tried it myself.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Dragon64 wrote ...
Also I'm curious to what would happen if the ZVS does not provide enough power for the multiplier. Will the Vripple just be very large because it doesn't have enough power to charge the multiplier capacitors before it drains?
I think the answer is that it will not output the design voltage, because the capacitors will not get fully charged. I think this is also the reason that 'most' voltage multipliers have larger capacitors in the lower stages, otherwise the capacitors in the higher stages wouldn't get fully charged.
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Voltage Multiplier current draw
