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Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
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Posts: 3068
A dual flyback transformer is NOT going to drive an CW that is capable of producing 1000 watts of continous output power as you stated you needed.
You basically will need an X-Ray transformer which is rated at the continous current you need (Note most X-Ray transformers are for PULSED or very short duty operation and rated as such)
Forget about CW multipliers. For that type of output power, i can 100% guarantee that the components you would need to construct a 1kW, 100kV CW multipler are BEYOND your resources and budget.
And Robert2 is not ever going to get 50mA continous current at rated voltage out of that voltage multiplier circuit, whether its submerged or not. Assuming you are driving at 15kV with 100% efficiency, with 9 stages you would be at about 135kV at 50mA or 6.75kW of input power alone! So thats one hefty transformer or power supply you must be driving your multiplier with. And perhaps on paper, you might get 96% efficiency, but in reality, the efficiency is going to be very low - especially at higher voltages which coronal discharge becomes a major problem that needs addressing.
Remember folks, there is reason X-Ray transformers and other high voltage generating transformers are SO BIG and BULKY - and they are rated only for a few hundred watts at most continuous. If small puny little CW multiplers could generate 10mA, 50mA, or 100mA of power at 100kV, don't you think they would use those instead of 100lb transformers?
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Pinky's Brain wrote ...
EastVoltResearch wrote ...
the efficiency is going to be very low - especially at higher voltages which coronal discharge becomes a major problem that needs addressing.
Glassman does everything with CW and in air and still claims 85% efficiency for 100 KV 1 KW (of course it's 20 kilos in a 3U case, but still).
Sure. However, 85% is still not anything close to 96%. (In power conversion, 90-95% is usually considered high efficiency, 85%-90% typical, <85% low efficiency) Also, Glassman utilizes very good field control and corona suppression with their CW multipliers. And despite that needs 3U and 50 lbs to do it which is relatively huge for a power supply.
My only point is that to generate 10mA at 100kV is going to take a bit more than a handful of disc capacitors, resistors, and diodes.
wrote ...
how does robert2 show those "fat arcs" in that video?
Firstly, those are NOT fat arcs. Actually, you can see a whole bunch of small mini-arcs. What is happening is during the discharge, the CW multiplier is discharging its voltage, and then folding back the voltage to practically nothing. Then it takes a number of recharge cycles of the CW to get back to its original output voltage. Once the recharge is completely, you see another streamer - hence why you have multiples there. So there is NO continuous discharge. If it was indeed continous, you would see a really nasty, fat arc with no break-up whatsoever.
And the video is full of discrepancies to begin with as well. For one, 100kV at 10mA is not 1.5kW, so not sure what is up with the math. 100kV at 10mA is 1kW.
Secondly, take a look at the 500k current limiting resistor which is situated in that SMALL little container. You really think that SMALL little container is going to be able to dissipate the kind of power you would generate with a 100kV, 10mA continous source? I don't think so.
Registered Member #3282
Joined: Wed Oct 06 2010, 05:01PM
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Posts: 224
So why not get two 60 ma 15kv sign transformers connect the primaries and secondaries in series run 240 volt mains through them get 30KV and design a multiplier that will work with 60hz and that current.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
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Posts: 3068
Microwatt wrote ...
So why not get two 60 ma 15kv sign transformers connect the primaries and secondaries in series run 240 volt mains through them get 30KV and design a multiplier that will work with 60hz and that current.
Because almost all 15kV / 60mA NSTs are midpoint grounded. If the outputs of the NSTs were truly floating, this could be accomplished, but because they are midpoint grounded, you wouldn't be able to do this.
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100kv 10ma
