t the moment. My new information provider seems prone to updating their ser ver programs ...
ntually got by dumping the digital divider and setting up the pulse sequenc es directly, which didn't help things all that much.
orking again. The relevant URL is
ator3.htm
d harmonic content of the - reasonable - sine wave you get out of a Baxanda ll class-D inverter. It's normally about 40dB below the fundamental if you don't load the tank circuit too heavily.
hoped.
in theory, do better.
ooh-pooh it while stating that you don't understand how it works.
Your sentence comprehension has let you down again. I didn't have any probl em understanding how it worked - and nobody who posts here regularly would either.
My problem was with why you wanted it to work. I couldn't see any reason wh y you'd want to simulate that particular circuit. You still haven't told us what the practicable version of the simulation might be, or what practical purpose it might serve.
--
Most who post here regularly have, no doubt, already figured it out
if they were even interested, but you??? Not likely.
Here's what you had to say about it:
You: "The simulation would have been more informative if you'd
simulated a slightly more realistic transformer, and your array of
D-type flip-flops didn't seem to be doing anything useful."
Me: "You have the editable schematic, and the transformer's not
holy, so feel free to make it as realistic as you like."
You: "Without some idea of what it might be intended to do, realism
seems a long way off."
Me: "The dflops comprise shift registers used to generate the
non-overlapping (break-before-make) gate drives for the MOSFETS."
You: "You could have done by specifying the pulse sequence more
carefully. In real life you'd do all of that in one programmable
logic device and level-shift the relevant outputs to drive the
MOSFETs"
Note that before you were apprised of the dflops' functions you were
in the dark as to their purpose in the circuit, but afterwards you
touted a higher degree of abstraction, as if you'd known their
purpose all along.
nteresting concepts that looked vaguely like that.
e at the moment. My new information provider seems prone to updating their server programs ...
eventually got by dumping the digital divider and setting up the pulse sequ ences directly, which didn't help things all that much.
s working again. The relevant URL is
illator3.htm
hird harmonic content of the - reasonable - sine wave you get out of a Baxa ndall class-D inverter. It's normally about 40dB below the fundamental if y ou don't load the tank circuit too heavily.
'd hoped.
d, in theory, do better.
y pooh-pooh it while stating that you don't understand how it works.
oblem understanding how it worked - and nobody who posts here regularly wou ld either.
if they were even interested, but you??? Not likely.
a slightly more realistic transformer, and your array of D-type flip-flops didn't seem to be doing anything useful."
holy, so feel free to make it as realistic as you like."
a long way off."
ping (break-before-make) gate drives for the MOSFETS."
. In real life you'd do all of that in one programmable logic device and le vel-shift the relevant outputs to drive the MOSFETs"
in the dark as to their purpose in the circuit, but afterwards you touted a higher degree of abstraction, as if you'd known their purpose all along.
When I ran the simulation, I could see that the MOSFETs were getting a non- overlapping drive.
I imagined that the D-type flip-flops were in there to do that, which seeme d to be a total waste of effort, since you could have got the same effect b y specifying the pulse sequences to be non-overlapping in the first place.
Why on earth you felt the need for two sets of D-flip-flops - for the posit ive and negative rails respectively - escaped me. You might have wanted the m in real life - if you desperately wanted to avoid level shifters - but it complicated the schematic simulation no end without making the simulation any more informative about the kind of stuff you run Spice simulation to fi nd out
Not with wanting it work in failure/success terms, but with wanting it work to do something - anything - specific.
cuit.
It's not so much my myopia as my incapacity to get dumbed down enough to sh are you point of view.
might be, or what practical purpose it might serve.
I can deduce plenty of potential functions - I just can't see why an experi enced circuit designer would need to simulate any of them at that elementar y level.
ack?
You wanted to pose as somebody who could design an interesting circuit. You r idea of an interesting circuit isn't remotely interesting, which leaves y ou affronted. Tough.
If there had been any opportunity to flatter you about the circuit, I would have taken it - it's not as if you are an obnoxious right-wing nitwit, lik e some of our regulars.
--
You say that now after you've been shown the trick, but if you'll
remember, your initial response was: ..."and your array of D-type
flip-flops didn't seem to be doing anything useful."
Which you haven't told us a thing about. What you've shown is a relatively low voltage sine wave generator. What did you want it for? Diathermy? Signalling?
Enquiring minds don't really want to know - what ever it was seems likely to be distinctly pedestrian - but without that information, further discussion is pointless.
ardware configuration will output the desired/required waveform(s)and timin g.
ly low voltage sine wave generator.
The usual application for 1.2kV in my - possibly idiosyncratic - experience is 1.2kV DC for driving photomultiplier tubes.
A 1k load at 1.2kV - 1.5kW - is a bit more than the average PMT divider cha in.
The point is that if you were rectifying the output, you wouldn't care much about the distortion levels, or the precise frequency. For diathermy the F CC may make you more picky about the frequency.
The usual way of getting a sine wave that sort of voltage is the Baxandall class-D oscillator. Jim Williams didn't call it that, but he made it very p opular for back-lighting laptop displays with cold-cathode tubes.
formatting link
r1.htm
This should include a copy of Peter Baxandall's original paper - when I jus t checked that link wasn't working, which is odd and I'll have to find out what's gone wrong this time - but I could e-mail you copy, if you want (I'v e got an e-mail address for you at Austin Instruments).
The web-site does list Jim Williams six application notes on the subject.
Sure, but what it's used for does place limits on how you do it. The Baxand all oscillator traditionally produces a sine wave with about 1% third harmo nic distortion, and at frequency that depends on the inductance of an ungap ped transformer, which is typically +/-25%.
I can do better, but with my variant with really low distortion and tight c ontrol of frequency the efficiency of the circuit goes down from 95% to 50% which would be a no-no at 1.5kW.
You still here causing trouble, Sloman? Why don't you decamp to Chicago, Detroit or California or some other bankrupt, socialist shit-hole? I'm sure you'd find that more to your liking.
ould have taken it - it's not as if you are an obnoxious right-wing nitwit, like some of our regulars.
Detroit or California or some other bankrupt, socialist shit-hole? I'm sure you'd find that more to your liking.
I'm perfectly happy with Sydney, Australia, which is probably a lot too soc ialist for your liking, though slightly too capitalist for mine.
I can't see that I'm causing any significant trouble here. With anonymous c reeps like you around my minor contributions would - in any event - be lost in the noise.
And I'm curious about the logic that equates Detroit, which is definitely b ankrupt, albeit through the operations of un-restrained capitalism rather a n any significant socialist input, with Chicago and California, which are m erely on the road to bankruptcy, and both rather better places to live than - say - Syria, where your kind of thinking seems to be a little too wide-s pread for comfort.
hatred for capitalism might have hampered your employment opportunities?
Greegor, has it ever occurred to you that I don't actually hate capitalism, and the version of socialism that I espouse relies on the free market to o ptimise the distribution of labour and resources everywhere that the free m arket actually does a good job.
I only favour socialism to deal with the issues that the free market doesn' t handle well - education, social security and health care are the obvious examples - and pretty much everybody in the countries where I've worked sha res this point of view. There's lots of discussion about where the free mar ket does a better job on it own, and where it needs more or less close supe rvision, but the only people who believe in the untrammelled free market ar e nutters like Thatcher, who more or less wrecked the U.K. manufacturing in dustry in the process of imposing her half-baked ideology on the country.
There's never been the remotest suggestion that my political opinions have damaged my job prospects. The only time I was active as a trade unionist - at George Kent in Luton, England - didn't do my prospects with the company any good at all, but I wouldn't have been active if the company offered an y prospects worth pursuing. In the event I left for a much better job at EM I Central Research, where I had fine time.
I did have to get a security clearance to work there - which took five mont hs to come through, which was odd because I'd been cleared to "most secret" in Australia a few years earlier (which had been good enough to get me int o US Army ECOM at fort Monmouth in New Jersey in 1970).
On Monday, 20 January 2014 19:55:08 UTC+11, DecadentLinuxUserNumeroUno wro te:
Curious joke. "Espouse" just means "adopt or support (a cause, belief, or w ay of life)." It's a relatively low frequency word, but not as low frequenc y as - say - albeit.
I'd guess it was part of my passive vocabulary from - at the latest - about about 1955, when I started taking books out of the adult section of the lo cal library, but my parents were both tolerably literate - both had univers ity degrees - and they probably used it in conversation before that. I'd wo nder what you were getting excited about, if it wasn't for the brain-damage issue.
It's you who are intellectually challenged. I'm perfectly capable of formatting my posts to conform to your antiquated conventions.
My problem is that I don't see the point of continuing to pander to the 80-character width limitations of the glass teletype when nobody is using them any more.
I could produce tidily formatted documents when programming in Fortran 4 with Hollerith statements, and I was very glad when that particular skill was no longer necessary.
You are AlwaysWrong, and I'm foolishly responding to your moronic provocations, rather than ignoring you, which would be better for the group and probably better for you as well.
On Tuesday, 21 January 2014 00:18:00 UTC+11, DecadentLinuxUserNumeroUno wr ote:
matting my posts to conform to your antiquated conventions.
80-character width limitations of the glass teletype when nobody is using t hem any more.
with Hollerith statements,and I was very glad when that particular skill w as no longer necessary.
ations, rather than ignoring you, which would be better for the group and p robably better for you as well.
.
That's not a problem. The only people who need to know that are the guys th at run them, and they don't need to know the fine details of the hardware. The whole point about modern technology is that it works reliably enough th at we can ignore the hardware and get on with using it to communicate or ma ke money or whatever.
there.
AlwaysWrong complaining about the blindness of other has a certain ironic c harm.
Which of my illustrious pasts are your referring to?
Snipping is good, in moderation, but you've overdone it here.
The answer doesn't depend on which of my past achievements you were referring to.
It's actually that I don't live off my wife - my own pension income would only support a less luxurious life style than I now enjoy, but my wife likes having me around, and we live in the manner that her more generous income can support.
Your image of yourself may depend on being better at your job than your wife is at hers, but I'm made of sterner stuff, and can live with the fact that my wife is even cleverer than I am.
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