Eldarion and Bruce's build of Bob's Energy Converter

[HumblePie]

Jason,
...BTW, I re-built the bias supply, and now it can generate 150V under significant load from the pulse generator.
Eldarion

Eldarion,  What did you change to improve you Bias Power Supply?  What diameter is that little toroid, what's it made of, and where did you get it?  Thank you very much for sharing. 

BTW - I am wondering why you guys are not favoring Coarse and Fine Phase Adjust knobs with Jason's RC Delay shown here:  http://www.physicsforums.com/showthread.php?p=1392746#post1392746   Thank you also for the Xylinx Spartan thread at http://www.overunity.com/index.php/topic,2894.0.html.  I will study this in the future.  A fine accomplishment you should be proud of.  Yes I see it does Phase also. 
Humble

[eldarion]

Jason,
...BTW, I re-built the bias supply, and now it can generate 150V under significant load from the pulse generator.
Eldarion

Eldarion,  What did you change to improve you Bias Power Supply?  What diameter is that little toroid, what's it made of, and where did you get it?  Thank you very much for sharing.

In order to improve the output power of the bias supply, I integrated it onto the MOSFET driver board so that I could use the FPGA to generate the exact timing required to generate maximum voltage from that toroid.

The toriod itself was scavenged from a computer power supply; it is about 1 inch in diameter if my memory serves me correctly.  Sorry I can't tell you much more about it.  You can use almost any type of inductor for this application, as this is just a simple switching power supply.  In fact, you probably do not want to use the same toroid, as maximum power output occurs at a frequency of 1KHz--very annoying!

Hope this helps,

Eldarion

[MeggerMan]

Hi Eldarion,
I have been looking at phase shifting and there does not seem to be any easy way around this.
I have tried to simulate an op-amp circuit but I could not see any phase shift at all.

Your circuit seems to solve all the problems in one go.
What is your upper frequency range and what increment can you achieve at this frequency?
It would be nice to take the sine wave output from a function generator and phase shift it into 3 outputs that are 120 degrees apart with the possibility to phase shift them +/- 20 degrees say but I cannot see how this can be done.
May have to wait for Bob to show us his little circuit.

Regards
Rob

[eldarion]

Hi Eldarion,
I have been looking at phase shifting and there does not seem to be any easy way around this.
I have tried to simulate an op-amp circuit but I could not see any phase shift at all.

Your circuit seems to solve all the problems in one go.
What is your upper frequency range and what increment can you achieve at this frequency?
It would be nice to take the sine wave output from a function generator and phase shift it into 3 outputs that are 120 degrees apart with the possibility to phase shift them +/- 20 degrees say but I cannot see how this can be done.
May have to wait for Bob to show us his little circuit.

Regards
Rob

Rob,

I have not tested the upper frequency limit, but I would say it might be around 1MHz (it does depend on the loading of the MOSFETs--higher loading and currents cause the MOSFETs and drivers to overheat at those high frequencies).  The step precision is 20ns for all parameters, including phase adjustments.  The MOSFETs are limiting the upper frequency; the FPGA's output can go up to 50MHz.

The only caveat is that my system outputs pulses, not pure sine waves.  I am currently thinking that pulses are the way to go, but I could be mistaken!   We'll see when I hook this thing up to a core and start 'er up.

I am getting schematics together like Bruce asked me to; I'll post them in my other thread along with a software update when I finish them.

Eldarion

[MeggerMan]

@Eldarion,
Yes it is pulses we need, nice square ones, I only mention sine waves as they can be used to work out the phase with.

I think I have a solution using the AD9959:
Output the 4 outputs into divide by 'n' chips and use the phase control to setup the offsets.
All 4 outputs are set to the same frequency, are all in sync and the divide by n chips do the exact frequency division.
The AD9515 chip is a delay adjust and divide by. (f/1 to f/32)
Only snag is that the delay adjust is 10ns max. in 16 steps.
Otherwise you could connect 3 x AD9515 to a single function generator.

Regards
Rob