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

[MarkSnoswell]

I spent *way* too much time last night (most of the night) doing spice simulations -- trying to find the best way to drive the primaries closed loop. The conclusion is that closed loop you really want a switch on each end of the line. Nothing else really works. The sequence target is:

1. Close switches at both ends
2. As soon as current rise starts to slow shut of both switches -- at about 2/3 applied potential.
3. When voltage reaches limit of switches open negative end.

You can think of this as opening both ends to let electrons rush in and build up momentum -- as soon as they do you shut off the ends and let the pressure (voltage) rise to the maximum -- then you open the negative end. The result of this is that you get the negative flyback wavefront propagating in a reverse direction back down the line -- this is as close as you can get to the original effect Tesla observed when they threw the switch on a long DC transmission line.

Driving an open coil is far simpler -- but you can only drive with the applied potential if your rise time is lower than the time it takes the longitudinal shockwave to travel down the coil. If you can?t switch this fast then all you will get is a tame rise of voltage to the applied potential. If your Transition time is *very* fast you should be able to get a longitudinal shockwave travelling down the line - but only at the magnitude of the applied voltage. High current IGBT's will switch the current about as fast as you can -- but they won?t switch the voltage fast enough. In this open ended mode you could use the Hyperfast lower current IGBT I listed on the Materials Parts and Data page.


After last night?s simulation work I am now leaning towards the more complicated two switch sequence and deliberately utilizing the electrodynamic momentum of the B field to drive a large reverse direction longitudinal wave front. I am also wondering if this is what was done in the targe TPU's and if the toroids in the middle were for floating the control for the switched on the ends of the lines.

No guarantees. None of this is a sure fire way of making it work ? My opinion is that until the switching is right there is little chance of seeing anything interesting. But even with the switching scheme I propose here I don?t know what will happen.
I am still testing switches, drivers and simulations. I am getting some great switch times and voltage spikes ? and blowing a lot of drivers at the same time ïÅ' This is mostly on the ferrite toroidal core I have. As I mentioned in a previous post I can?t trigger any of the longitudinal magnetoacoustic models in the Iorn Powder core. .. I can hear a ringing from the core but I have no idea what that is and if it?s any use.
I have been talking to Graham Gunderson about his experiences with drivers. He went through the same grief I am having until he came up with a robust and very fast modular driver board that he now uses for everything. He is sending me circuit diagram and made up boards and I will roll that information into a reference design that will be available for everyone to use.

Cheers
Mark.

[Grumpy]

yup...

[MarkSnoswell]

Keep in mind that the flow of current is retarted in iron or other magnetic wires.

Another intersting approach is an old Tesla coil diagram that used chokes on each side - see attached. 

(Someone was serious about blocking current and again you will see the retardation of the current flowing.)


Side note: there is probably wa way to replace the primary coils with something more like a plate since we are not using the coil as an inductive coil.

LOL -- excellent timing ... I tried all sorts of chokes on either side in the simulation tests -- it's the first thing I thought of. After fiddling around for ages I decided that with modern fast switches it's easier to just time switches at both ends. It's a moderatly complicated switching scheme -- but once set up you can drive all sorts of different inductance lines and coils. With the chokes at each end everything has to be tuned just right.


On plates rather then primary coils -- I have a set of HF ferrite toroids commming in to do just that - set up a transmition line that should only pass longitudinal waves and is designed as a resonator for them. It will be a set of spiral coils that also act as capictor plates interleaved with toroid ferrite. The idea is the enhance the radial amgneti field while only permitting longitudinal electric field. THis is just a research tool -- not a practical device -- well that's the intent.

mark.

[eldarion]

1. Close switches at both ends
2. As soon as current rise starts to slow shut of both switches -- at about 2/3 applied potential.
3. When voltage reaches limit of switches open negative end.

You can think of this as opening both ends to let electrons rush in and build up momentum -- as soon as they do you shut off the ends and let the pressure (voltage) rise to the maximum -- then you open the negative end. The result of this is that you get the negative flyback wavefront propagating in a reverse direction back down the line -- this is as close as you can get to the original effect Tesla observed when they threw the switch on a long DC transmission line.

Hi Mark,

That is a vey interesting set of observations--I, too, had come to similar conclusions, but had not had the inclination to build such a complex switching arrangement.  I think I just might now, though!

I assume you meant to:
1. Close both switches
2. Open both switches
3. Close the negative-side switch?

Thanks!

Eldarion

[MarkSnoswell]

I assume you meant to:
1. Close both switches
2. Open both switches
3. Close the negative-side switch?

er -- yea. I think. When I get it all working in the simulator I'll send you the spice model if you like. ... and then I'll be doing some testing to confirm that it works as designed ... and hopefully I'll stop blowing up drivers too.

mark.