Bob Boyce TPU thread

[HumblePie]

HEY!  I meant all besides BB and the Dr.  I heard the orders loud and clear.  Bruce indicated he really really wanted us to learn uCntrls.  I do not expect anyone's code.  I am checking uCntrl choices you have all made and if they fit new 10nS pulse-width and delta .00001 accuracy (increment/freq out). 
Humble

[MarkSnoswell]

@ward

There is no ideal, of the shelf,  controller out there for what we want.

* DDS:  great frequency and accuracy. No pulse width control. SYnchronization of multiple chips tricky.

* uControllers: slow but some have 3 phase PWM output... but no fine phase control. ARM 7074 is one of the fastest dedicated devices with 3 phase PWM. As you have foune this device is good for 300Hz - 250Khz or so with diminishing accuracy at higher frequencies.

* uControllers with multiple timers and single phase PWM are fine for lower frequencies <30KHz but have very poor capability/accuracy at high frequencies. ATMega128 is best choice of these with 6 PWM outputs.


** 4 channel DDS + variable width monostables would be best. AD9959 is a quad DDS. It is also capable of rapid frequency changes so you can also test driving with spread frequency ranges -- this is mainly for the third and highest harmonic -- rather than tuning just 'off resonance' we can test driving with a spread frequency centered on the resonance frequency.

I would also like to have the output stage opto isolated on separate boards -- better for saftey and make sit easier to make a range of output boards to test: postive pulse, negative pulse, valve etc. i just posted my wish list for a controller board here http://www.overunity.com/index.php/topic,2831.21.html

cheers

Mark.

[HumblePie]

@Dr.,  Thanks.   I'll focus on alternatives ways now. - Humble

[Bob Boyce]

@Bob  Boyce

What are the three states of dominant energy?

Polar
Parapolar
Diapolar

Bob

[Bob Boyce]

Hi all

Sorry I haven't posted earlier. A storm blasted through and took out the phone lines again. One of the drawbacks of rural living, this area loses power and phone lines every time a thunderstorm rolls through. I'm the only one around here that still has power during power grid outages, but I can't do anything about phone lines ;-)

I just wanted to touch base and let you all know I have been pretty busy, but hope to spend time out in the shop today. Before I wind my secondary on this core, I am going to go ahead and add some more longitudinal windings. This way they will already be there in case I want to do some testing with them later.

No problem on the proprietary controller... I will be releasing a basic version of my HexController, which is based on the Atmel AT-Mega48 microcontroller running with an external 20 Mhz clock for stability. I have it in alpha test with a replicator in Florida, wanted to make sure there were no trace errors prior to release. I had stopped working on it mid-design, so had to complete it on my own time. That basic version was designed prior to my being contracted to design a deluxe version, so it is not bound by the agreement. I will be more than happy to share it with the group for testing.

Bob