Scope shots of clean kicks

[bob.rennips]

Way nice set up - Eldarion.

Can't wait to hear how it all goes.

[Jdo300]

Well, here is a pic of my TPU v4.  I have yet to receive (and therefore install) my MOSFET drivers, but when I do, I just have to plug them into two IC sockets and fire it up!

The board on the back is a delta-sigma ADC, and the MOSFETs on the driver board are IRF640s.

Hi Eldarion,

Nice PCB man! Just a warning to you though. You NEED to shield the thing or it will be worthless when you fire up your TPU. If the coils are pulsed with a fast enough rise time, you will get LOTS of RF emissions from the coils which will easily booger up the signals going into your board. I suggest placing the board FAR away from the TPU and run coax cables to a separate board with the MOSFETs on it. By the way, are you using MOSFET drivers?

God Bless,
Jason O

[eldarion]

Well, here is a pic of my TPU v4.  I have yet to receive (and therefore install) my MOSFET drivers, but when I do, I just have to plug them into two IC sockets and fire it up!

The board on the back is a delta-sigma ADC, and the MOSFETs on the driver board are IRF640s.

Hi Eldarion,

Nice PCB man! Just a warning to you though. You NEED to shield the thing or it will be worthless when you fire up your TPU. If the coils are pulsed with a fast enough rise time, you will get LOTS of RF emissions from the coils which will easily booger up the signals going into your board. I suggest placing the board FAR away from the TPU and run coax cables to a separate board with the MOSFETs on it. By the way, are you using MOSFET drivers?

God Bless,
Jason O

Jason,

Thanks!  I will definitely try to shield it with something (not sure what yet).  Yes, I am using MOSFET drivers, specifically Maxim's MAX627 drivers.  They are the reason this TPU has not been fired up yet, as they are still in the mail system somewhere...

I should have some results in the next few days for everyone.  I hope this is it; every time I go over SM's words and his prototypes I keep seeing this design.

Before I forget, I should mention that I am using diodes to isolate the driven coils during the back-EMF spike, instead of using them to short out the spike.  I am curious if this will allow the spike to couple into the other coils better and help the conversion process.  This fits in nicely with the discovery of a diode on one of SM's prototypes (I came up with this idea separately).

Eldarion

[bob.rennips]

Well, here is a pic of my TPU v4.  I have yet to receive (and therefore install) my MOSFET drivers, but when I do, I just have to plug them into two IC sockets and fire it up!

The board on the back is a delta-sigma ADC, and the MOSFETs on the driver board are IRF640s.

Hi Eldarion,

Nice PCB man! Just a warning to you though. You NEED to shield the thing or it will be worthless when you fire up your TPU. If the coils are pulsed with a fast enough rise time, you will get LOTS of RF emissions from the coils which will easily booger up the signals going into your board. I suggest placing the board FAR away from the TPU and run coax cables to a separate board with the MOSFETs on it. By the way, are you using MOSFET drivers?

God Bless,
Jason O

Jason,

Thanks!  I will definitely try to shield it with something (not sure what yet).  Yes, I am using MOSFET drivers, specifically Maxim's MAX627 drivers.  They are the reason this TPU has not been fired up yet, as they are still in the mail system somewhere...

I should have some results in the next few days for everyone.  I hope this is it; every time I go over SM's words and his prototypes I keep seeing this design.

Before I forget, I should mention that I am using diodes to isolate the driven coils during the back-EMF spike, instead of using them to short out the spike.  I am curious if this will allow the spike to couple into the other coils better and help the conversion process.  This fits in nicely with the discovery of a diode on one of SM's prototypes (I came up with this idea separately).

Eldarion

I think we are all on the same page! Fantastic. It's good to know that others have come to the same conclusion regarding raising the inherent capacitance. Brnbrade's recent experiments also point to this being an important aspect.

The isolated coils hold, at the right frequency, in my case 300+V for the whole OFF period. The distance of influence on other metal objects is several feet. But this is as a voltage potential not as a current.

Will this held electric field transfer from one coil to the next ?
Will the electric field rotate at high speed ?

Will Eldarion's drivers arrive before the weekend ?!!

I've no idea how electric fields are going to mix in the center of Eldarion's TPU but I think we are all going to find out soon!!!!

Way to go. Good luck. Take things slow - we want you in one piece to report back!!

Cheers, Bob.

PS. Please let this be a success - my wife already thinks I'm completely loopy for spending the money I do on kit and chips and wire and...

All my kit comes by mail order - you see my wife's face each time the postie arrives with more stuff and I tell her it's a set of driver chips. "I thought you got those last week ?". "Er needed more - the last set er burnt out!!"....

[Thaelin]

Hi Bob:
   Could you tell me how you have the diodes hooked up.  As in are both cathodes towards the ground side? Would seem correct to me. Just want to be sure.

sugra