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Old 20th June 2007, 02:54 AM   #1
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Default 14vdc to 200vdc

What is the easiest way to make 200vdc @ 20 amps from 14vdc? (4000watts)

thanks
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Old 20th June 2007, 03:07 AM   #2
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I would try a bunch of interweaved 2 switch current mode forward converters. But it won't be easy. Push pull could be used as well, the power loss due to leakage inductance could be a big problem. In a 2 switch forward converter the energy stored in the leakage inductance is put back into the DC bus and not lost.
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Old 20th June 2007, 05:19 PM   #3
whoa is offline whoa  Hungary
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ahh that's a hell lotta power

how about connecting sixteen Optimas in series?
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Old 20th June 2007, 05:47 PM   #4
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I would suggest a small Honda generator -- you don't even need a transformer as there is a 220 VAC out -- about $400 which is less than a switch mode power supply.
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Old 21st June 2007, 12:20 AM   #5
TechGuy is offline TechGuy  United States
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>What is the easiest way to make 200vdc @ 20 amps from 14vdc? (4000watts)

I am assuming that your planning on driving this off battery power, It would be much better to stack two or more batteries in series, otherwise your conversion efficiency is going to be terrible. The closer your input voltage is to your output voltage the higher the efficiency. Using multiple batteries in series is also going to reduce the stress on your batteries since you need to pull fewer amps using a higher input voltage. Which means they should last longer.

The best approach would be to use a full bridge converter coupled with a transformer. Its likely to provide you with decent efficiency and a reasonable simple design. More parts = more $$$ and more headaches.

If you can get away with about 170VDC, you could probably use an off the self UPS and add an external DC rectifier bridge, with an output inductor and output caps. If you need exactly 200VDC, you could probably use a PFC controller to bump the output to 200VDC, athough this might cause some issues with the UPS depending on how fast its feedback loop operates.

Finally I would like to add, that your better off using UPS batteries than standard car or marine batteries. You get more milage out of UPS batteries (of off-grid batteries) since they are designed better for repeative deep-discharge cycles.
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Old 21st June 2007, 02:45 AM   #6
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Default 200vdc @4kw?

Just curious, what are you wanting to power? I was thinking you could hack into one of the 110v inverters they sell at truck stops or through mail order They may also have 220v units available. They have them up to 4kw and they are not terribly expensive. The internal rails should be around 160vdc for 110 volt and 280vdc for 220 volt units. I would think you could modify the feedback circuit and add/remove some turns to the secondary to get what you need. The hard part would already be done for you.
Just a thought. Regards, Steve
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Old 21st June 2007, 09:32 AM   #7
Eva is offline Eva  Spain
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You could use several push pull converters with independent MOSFET banks for each transformer primary winding and the secondary windings connected in series. This ensures perfect current sharing and reduces the problem to much easily manageable current levels in each primary side cell. Additionally, you can use independent grounds for each primary cell, but keep them synchronized with optocouplers, and feed each cell from a different battery.
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Old 22nd June 2007, 04:11 AM   #8
dangus is offline dangus  Canada
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Connect a starter motor to a couple of alternators. Put a full 12 volts on the fields; do whatever is necessary to get one to generate + voltage and the other negative, or just run 'em in series. http://www.1stconnect.com/anozira/Si...alternator.htm
Easy... and should be good enough if you just need to the power the amp for brief periods for SPL competition.

Motor-generators were used for generating high-voltages for mobile tube gear way back when.
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