Variable load device - Page 3 - diyAudio
Go Back   Home > Forums > General Interest > Everything Else

Everything Else Anything related to audio / video / electronics etc) BUT remember- we have many new forums where your thread may now fit! .... Parts, Equipment & Tools, Construction Tips, Software Tools......

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 21st December 2012, 03:50 PM   #21
DF96 is offline DF96  England
diyAudio Member
 
Join Date: May 2007
Quote:
Originally Posted by gmaslin
Seriously, the function required here is so simple that I don't see why it couldn't be concluded here. Anyone else?
Yes, so simple. Why not just do it?

Anyone else? I'm out.
  Reply With Quote
Old 21st December 2012, 04:09 PM   #22
DUG is offline DUG  Canada
diyAudio Member
 
Join Date: Jan 2003
Location: mississauga ontario canada
I'm still in.

As I said, I like a challenge.

Even if only to suggest a concept.

But, I'm still in.
__________________
Doug We are all learning...we can all help
"You can't stop the signal, Mal. Everything goes somewhere..."
  Reply With Quote
Old 21st December 2012, 04:42 PM   #23
DUG is offline DUG  Canada
diyAudio Member
 
Join Date: Jan 2003
Location: mississauga ontario canada
I have a concept.

Would be about one half cycle + 20-50uS response time.

The half cycle is to get the load current value.

The 20-50uS is an estimate for processing and load switching. (high power part)

__________________
Doug We are all learning...we can all help
"You can't stop the signal, Mal. Everything goes somewhere..."
  Reply With Quote
Old 21st December 2012, 06:12 PM   #24
DUG is offline DUG  Canada
diyAudio Member
 
Join Date: Jan 2003
Location: mississauga ontario canada
Thought some more.

3/8 cycle to get load current.

Load balance ready for next half cycle.

Best I can come up with.
__________________
Doug We are all learning...we can all help
"You can't stop the signal, Mal. Everything goes somewhere..."
  Reply With Quote
Old 21st December 2012, 09:28 PM   #25
Banned
 
Join Date: Dec 2012
DUG
Nice to see you here from the cyclo-converter thread. Line impedance is practically nil for any voltage step the branch uses at 50-60Hz. Before his departure, DF96 did suggest branching passively and the more I think about it, that might be the best all around solution. Doing so will have practically zero response lag and be cheap to implement short term since the current will flow proportionally. It's a shame he felt tweaked because if his stated cred is legit, there probably isn't anyone on this forum that would be more qualified to cue us in what we need to do. He probably saw or maybe even had a hand in designing a grid system first hand. Back to your questions:
Even a half cycle lag might work if it existed ONLY on the secondary branch but ideally, the lag should be as close to zero as possible. After your first post, I've began researching different cyclo-converter schema. Load balancing and timing the diodes will be a pain when we aggregate the cycles. Making the whole output DC and re-inverting may make more sense there but this discussion belongs in the other thread. This thread deals with our problem after the cycles are tamed so the same 600VAC origin applies. Have you got a circuit or just an approach suggestion?

Last edited by gmaslin; 21st December 2012 at 09:32 PM.
  Reply With Quote
Old 21st December 2012, 10:10 PM   #26
Enzo is offline Enzo  United States
diyAudio Member
 
Join Date: Sep 2004
Location: Lansing, Michigan
The OP has been deliberately coy about the nature of the project. For example telling us he never said it involved amplifiers, yet later saying he never said it was not audio. OK, whatever. Either this is world changing and he fears someone will steal it, or??? Makes it harder and harder to give it enough attention to get anywhere.
  Reply With Quote
Old 21st December 2012, 11:00 PM   #27
Banned
 
Join Date: Dec 2012
Enzo
I am the original poster, no reason to be deliberately coy about naming me

I'm not smart enough to come up with anything world changing, just ask DF96 and he will tell you so. This is just an academic exercise that might have a practical application and nothing more. As to what that practical application would be, who knows but if something exists that wasn't there before, someone will be smart enough to come up with a way to use it.
  Reply With Quote
Old 22nd December 2012, 01:39 AM   #28
DUG is offline DUG  Canada
diyAudio Member
 
Join Date: Jan 2003
Location: mississauga ontario canada
jamesshillj "Post 1 is meaningless in engineering terms and asking for a circuit to do solve a problem that has no parameters..."

It had enough parameters for me to give a correct answer...almost as soon as I read it.

It just wasn't what gmaslin was looking for.

From post # 25 "DF96 did suggest branching passively"

I'm not sure what you meant there...I'm a little slow some times.

If you were going to translate it to DC then that is easy...current source and shunt regulator. What isn't used by the load is into the shunt.

So, no half cycle by half cycle correction...

Only the first half cycle would not get proper total load.

Oh well, onto more challenges.
__________________
Doug We are all learning...we can all help
"You can't stop the signal, Mal. Everything goes somewhere..."
  Reply With Quote
Old 22nd December 2012, 02:42 AM   #29
Enzo is offline Enzo  United States
diyAudio Member
 
Join Date: Sep 2004
Location: Lansing, Michigan
gmaslin, I was simply too lazy to scan up to get your name correct, so I used standard notation of OP. No disrespect or mystery intended.

In the case of purely academic exercises, it still is often useful to have a concrete example. Make up a potential real world application - even if it would be impractical or already done by other means. At least we would have a context.
  Reply With Quote
Old 22nd December 2012, 03:09 AM   #30
diyAudio Member
 
Join Date: Feb 2005
Well Doug,

You win the prize, and first up, too - a cycloconverter (or inverter) is a thyristor motor control device.

I would never have got there, as I was thinking about something to do with Audio like an AC shunt reg or something weird.

Ah, well - old age comes to us all!

Curiously, does this "the cyclo-converter thread" have another name?
__________________
... jh
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Load and device protection akis Solid State 28 5th August 2012 11:56 AM
Power load, dummy load (pic) luka Power Supplies 43 9th February 2012 02:50 PM
variable baffle step device Dave Jones Multi-Way 1 20th January 2011 02:52 PM
Dynamic load line analysis using music and speaker load Michael Koster Tubes / Valves 0 7th March 2008 08:47 PM
variable l-pad with 6 ohm load EdGabriel Multi-Way 4 24th October 2006 12:07 PM


New To Site? Need Help?

All times are GMT. The time now is 03:12 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2