Graham Gunderson's Energy conference presentation Most impressive and mysterious

[Smann]

Hello. I recall Graham Gunderson as a genius guy ... from some 15 years ago...  he was doing experiments on magnets made of non magnetic materials - which he kept secret and asked us to not question him about the method - and then I lost connection with him. Has anybody any idea if he came out with those magnets? Thanks!

[Spokane1]

I don't understand.  Are you suggesting that there are some IXDD614 MOSFET drivers that provide 16A turn-on/off pulses and some that provide only milliamp pulses?
IMO single milliamps are not enough to charge/discharge under a microsecond the 161nC gate charge, formed by the 2773pF gate-source capacitance + gate-drain Miller's capacitance multiplied by the MOSFET's transconductance ( 15pF * 23.6 = 354pF ).
But this datasheet lists a mere 4V gate voltage needed to turn-on this MOSFET ( V_GS(th) ) while the maximum tolerable gate-to-source voltage ( V_GSmax ) is listed as +25V and -10V negative.  Exceeding these maximum ratings leads to gate insulator damage (MOSFET damage).

Dear verpies,

Lower cost MOSFET drivers only put out 3-4 Amp control pulses (like the ones I'm using) relative to the $2.62 IXDD614 that can put out a 16 Amp pulse quickly. In my last post I was pointing out that such a high performance driver was probably not needed for the TO-92 sized switching element apparently being used.

On gate driving parameters:

It is all a question of speed, where you need it, and how much you want to pay for it. Many devices can improve their performance by overdriving the gate parameters by 5%, 10% or 20%. It depends upon the manufacture. For production design, where you want the device to last 20 years, then the data sheet parameters are good guidance. If you are doing cutting edge development work where that extra 20% means the difference between clear success or so-so success for something that is only going to run for a few hours in its entire life time, then data sheet parameters are routinely exceeded - just like high performance racing engines. But this comes at the cost of a lot of smoke as some devices (and engines) fail to rise to the occasion.

Graham claims that CREE components can handle 20% over drive, at least in the time frame he works with. He added extra clamping components to insure that the gate signal pulse doesn't exceed these higher voltages.

If you want the high speed transitions then you need to exercise the full limits of the device being used.

At $70 a power MOSFET I'm not going to be that bold for a while and will have to settle for so-so success.

Spokane1

[Spokane1]

Hello. I recall Graham Gunderson as a genius guy ... from some 15 years ago...  he was doing experiments on magnets made of non magnetic materials - which he kept secret and asked us to not question him about the method - and then I lost connection with him. Has anybody any idea if he came out with those magnets? Thanks!

Dear Smann,

As I understand it Graham went to work for Mark Gobles about that long ago. Mr. Gobles had discovered some kind of superconducting carbon nano-tubes that held a lot of promise. He received some substantial funding to advance his discovery. Again as I understand it the work came to a dead end when it was determined that they couldn't increase the current levels beyond the initial discovery. If they could then the non-metallic magnet would have become a reality. So I think the whole idea is sitting in a library somewhere in someone's Master thesis paper.

Mr. Gobles was still flush with money and developed an interest in non-classical conversion systems (Free Energy). He hired Graham Gunderson to explore some of his ideas and to examine other inventors ideas. When the money ran out Mr. Gobles gave Graham all the collected equipment. The company changed hands and Graham continued to work for the new owner for about four years. He was laid off about two years ago.

Now Graham works as an electronics technician trouble shooting aircraft instrumentation in Spokane.

Spokane1

[minnie]

  Mark Goldes and Randall Mills have gotten through a fair few dollars in their time.

[Smann]

Thank you Spokane1 !

May I ask why why do my messages not appear? You replied to me but my original message is not on the thread and my status says that I have zero posts. Thanks!

Dear Smann,

............................

Spokane1