Inverse Marx generator
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From: Tim Williams on 4 Jul 2010 01:27 "whit3rd" <whit3rd(a)gmail.com> wrote in message news:54be4f37-be5f-4da3-a042-af7ca241a80e(a)q12g2000yqj.googlegroups.com... > It's an exercise in finding utility, then. How about exciting the > plate of a vacuum tube? Then, you can feed a 'suitable' frequency > into the grid and get whopping AC power output from a > transformer on the cathode circuit. But they don't make tubes that run 500kV, at least that are meant to do any AC. Certainly no NOS radio tubes. And low efficiency, and low bandwidth, and blah, blah. Tubes in the 10kV range might not be too horrible for doing the series-parallel conversion (sync rect with tubes?), but driving the heaters is a pain. Even big stacks of FETs are appealing at that rate. And even then, you might as well go with 500 or 1000V caps, and more stages, so you get a single transistor per stage without cascoding. So the question remains, how does one change HV into useful V? Flying capacitors, sure, but can you tackle the isolation? Tim -- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms
From: Grant on 4 Jul 2010 03:30 On Sun, 4 Jul 2010 00:27:11 -0500, "Tim Williams" <tmoranwms(a)charter.net> wrote: >"whit3rd" <whit3rd(a)gmail.com> wrote in message news:54be4f37-be5f-4da3-a042-af7ca241a80e(a)q12g2000yqj.googlegroups.com... >> It's an exercise in finding utility, then. How about exciting the >> plate of a vacuum tube? Then, you can feed a 'suitable' frequency >> into the grid and get whopping AC power output from a >> transformer on the cathode circuit. > >But they don't make tubes that run 500kV, at least that are meant to do any AC. Certainly no NOS radio tubes. And low efficiency, and low bandwidth, and blah, blah. > >Tubes in the 10kV range might not be too horrible for doing the series-parallel conversion (sync rect with tubes?), but driving the heaters is a pain. Even big stacks of FETs are appealing at that rate. And even then, you might as well go with 500 or 1000V caps, and more stages, so you get a single transistor per stage without cascoding. > >So the question remains, how does one change HV into useful V? Flying capacitors, sure, but can you tackle the isolation? Carefully aimed pointed wires? :o) Gently drifting the ion flow, Step-down Van der Graaf upthread sounds good? Grant.
From: whit3rd on 4 Jul 2010 13:30 On Jul 3, 10:27 pm, "Tim Williams" <tmoran...(a)charter.net> wrote: > "whit3rd" <whit...(a)gmail.com> wrote in messagenews:54be4f37-be5f-4da3-a042-af7ca241a80e(a)q12g2000yqj.googlegroups.com... > > It's an exercise in finding utility, then. How about exciting the > > plate of a vacuum tube? > But they don't make tubes that run 500kV, at least that are meant to do any AC. Certainly no NOS radio tubes. And low efficiency, and low bandwidth, and blah, blah. OK, so use a klystron (those DO scale to 500 kV) but your AC output will be at a possibly inconvenient frequency. 'low efficiency' is not as big an issue as you might think; there are 23MW klystrons, at that scale (or even at 0.5 kW in a microwave oven) the efficiency beats out all solid state competitors.
From: Tim Williams on 4 Jul 2010 13:46 "whit3rd" <whit3rd(a)gmail.com> wrote in message news:2ba10a9a-11c7-47d5-997b-f62f9325d1b3(a)t10g2000yqg.googlegroups.com... > OK, so use a klystron (those DO scale to 500 kV) but your AC > output will be at a possibly inconvenient frequency. > 'low efficiency' is not as big an issue as you might think; there > are 23MW klystrons, at that scale (or even at 0.5 kW in a microwave > oven) the efficiency beats out all solid state competitors. Hmm, at that voltage, heater power is inconsequential, and if it runs at a lazy 500MHz let's say, there are plenty of schottkies around that could convert it, maybe not at great efficiency, but it's something. They don't have 500kV klystrons at AES though. :) It's one possible solution, if one were to make a startup, and cook their own tubes, and "harness" lightning. Tim -- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms
From: petrus bitbyter on 4 Jul 2010 14:13
"Tim Williams" <tmoranwms(a)charter.net> schreef in bericht news:iAAXn.3984$Ls1.1574(a)newsfe11.iad... Let's say you had a really high voltage, low current source. Not very useful. Think nuclear battery, or lightning. So let's say you use it to charge a stack of caps. Then you rewire the caps in parallel. It's like an inverse Marx generator, or a synchronous C-W multiplier. How would you do it? Tim -- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms By far most of the high voltage sources I know about you need a lot more energy to operate them then you ever can retrieve. Todays nuclear batteries as used in some spacecraft are low voltage. Only lightning consists of very high voltages and currents but they are very, very short so the total energy of a lightning strike is some Ah only. So harvesting this energy is likely to use more then it yields. petrus bitbyter |