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help needed for MEG tuning   Message List  
Reply | Forward Message #1303 of 1374 |
Re: help needed for MEG tuning

Hi, it's me again,

I have some updates and some graphics. Theses graphics show one of my
biggest challenge into understanding and making work the MEG.

This one:
http://cf.pg.photos.yahoo.com/ph/ccool_j/detail?.dir=cdf7re2&.dnm=7824re2.jpg&.s\
rc=ph


is a graph of the voltage at the entry of my Coils. The graph is
"inverted" because when the tension is zero, it means that there is
some current going in. If you refer to JL Nadin's design, I am
reading the tension between the Fets and the input coils. As you can
see in this picture, there is a lot of resonnating freqencies in
there. On the graph, I have chosen a frequency that minimises the
effects. Well at least the "first big peak" of the high frequency in
there. I was wondering if any of you observed phenomenon like these
on their MEG or mine just has too many parasites
(capacitorS/inductors/resistors)

By the way, the reason why the tension goes on the minus side is
because I added a protecting diode to bloc the current and protec my
Fets. But even without this protective diode I still have the
resonnating effect.

Also, on this graph:
http://cf.pg.photos.yahoo.com/ph/ccool_j/detail?.dir=cdf7re2&.dnm=5edfre2.jpg&.s\
rc=ph


You can see both of my output (tension divided by 6 with a 66kohm
total resistor)

I have been trying to figure out what is causing that "bump" on the
sinus wave. If you look carefully, you can see it is only on the
"upper" side of the graphic. If I push up the frequency, I can
diminish the bump-effect, but my COP is going down very fast... That's
why I was wondering if anyonw had this effect or could explain (or
give a good hint)

This graph is kind of giving me an idea,
http://cf.pg.photos.yahoo.com/ph/ccool_j/detail?.dir=cdf7re2&.dnm=d250re2.jpg&.s\
rc=ph


It is a graph showing the entry (1) with the output (1). As you can
see, there is a phase between the output and input, which is leading
me to think that the bump and the high frencies mentionned before are
linked somehow...

I know this mail is getting long, that's why I won't talk right now
about the other aspect of COP based on average DC current vs RMS
current. (curious peaple can look into the other pictures in this album)

Thank you for reading and commenting. I really like to read you
comments. I've read a lot of previous message now, it is very
instructing.

Ccool








Wed Apr 26, 2006 4:44 am

ccool_j
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Forward
Message #1303 of 1374 |
Expand Messages Author Sort by Date

Hello guys, I'm new to this group, but it seems that some of you have some experience with the MEG, so that's why I'm posting here the details of my...
ccool_j
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Apr 20, 2006
4:49 am

... Have you tried lower pulse width with a deadtime in betwwen? Say something like 2 x 40% with 10% OFF. Mark Jordan...
Mark Jordan
enkitec
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Apr 20, 2006
4:51 pm

No. Never tried....
Mark Jordan
enkitec
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Apr 21, 2006
3:46 pm

I have'nt tried either... As far as I know about the meg, what is important is to get fast switching. Faster you go, the better it should be (as said in the ...
ccool_j
Offline Send Email
Apr 26, 2006
12:19 pm

No, because my meg was started as a project with some high school kids last year... we got it built and just started testing and the school year ended. By then...
Brent Selleck
selleck999
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Apr 22, 2006
4:37 am

... the real ... Bearden told ... but the ... beyond the ... secondaries was ... the key ... the core ... errant ... it's so ... Thank you for your insight on...
ccool_j
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Apr 26, 2006
12:20 pm

... As the core goes into saturation, the field will be less contained in it, so if good things happen when saturation occurs, it refutes the idea that high...
ey930
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May 5, 2006
1:54 pm

Hi, it's me again, I have some updates and some graphics. Theses graphics show one of my biggest challenge into understanding and making work the MEG. This...
ccool_j
Offline Send Email
Apr 26, 2006
12:19 pm

In looking at your output waveforms, it appears that your MEG is still a "Biased transformer". Note the skewed output waveform. Try changing the input...
Norm Fletcher
fletchmo47
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Jun 4, 2006
3:15 pm

You point out one the more interesting aspects to all of this... the ability to measure what's really going on... I sell robotic lawn mowers that use a ...
Brent Selleck
selleck999
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Apr 26, 2006
7:53 pm

On Sun, 04 Jun 2006 05:56:48 -0000 "Norm Fletcher" <fletchmo47@...> wrote ... I have 2 comments, for which I hope to see a reply: Since the core is...
Wayne Robey
ey930
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Jun 8, 2006
2:30 pm

... secondary on it's leg. You can see this clearly in old TV fly-back transformers. Could this secondary resonance be what you are tuning for? OK Let me see...
Norm Fletcher
fletchmo47
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Jul 19, 2006
7:20 pm

Very well said.... and I await your results eagerly... ... From: "Norm Fletcher" <fletchmo47@...> To: <MEG_builders@yahoogroups.com> Sent: Tuesday,...
Brent Selleck
selleck999
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Jul 21, 2006
3:15 pm
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