Successful TPU-ECD replication !

[MarkSnoswell]

@otto

just to let you know that I have started a replication of the ECD... with some changes in the mosfet switching configuration to save power...

The first thing I did was build a pair of mosfet switches which I drive with complimentary non-inverting and inverting drivers... one switch on the high side and one on the low side of the coils. By switching them at the same time you get the same voltage swing on the coils as with your setup but with minimal power consumption.
I am using TC4421/22 drivers and IRF820 mosfets. I chose the 820's because they have 500V rating but only 360 pf gate capicitance. The trade off is they can only drive 8A peak current -- but that's not a concern when your just switching potential. I have a pair of schottky diodes on each switch as well to speed up the reverse recovery and clean up the output...

Anyway -- inital tests of a switch pair show that I have a switch time of about 15ns with very little ringing and a power drain of about 200mw at100Khz and 15V drive into a collector (dead short) of your design... this is low enough power consumption that I can run from a couple of 9V batteries.

I have only made a single pair of switches -- which I will drive with 3 signal generators via OR gate. This will achieve exactly the same switching logic as your design achieved with fewer parts and greater efficency.

Of cource I dont know if this will still work as there are several changes from what you did.

cheers

mark.

[ronotte]

@ Mark

I did same test with 3 ORed generators some time ag? using only one Mosfet's driver + Power Mosfet (IRFP460)  but not using your upper/lower side driver. Well it's not the same as using the Otto's way. I don't know the reason why...difficult to find a concrete reason!   Anyway with that arrangement I've not been able to obtain the same output as in standard configuration.

Roberto

[leeroyjenkinsii]

Any free energy out of this project yet?

[Motorcoach1]

@ Otto , In back reading some posts you mentioned reeds to turn off the Mobius coil , what type are you useing and how are you operating them. I'm useing a board out of a microwave oven redsigned for freq's and use the timer to start and stop the coils operation.. and no I'm not useing the same freq's as a regular microwave.  the nice part of the board is the power settings and other nice little setting that are on this one. Thanks mike 

[MarkSnoswell]

@ Mark

I did same test with 3 ORed generators some time ag? using only one Mosfet's driver + Power Mosfet (IRFP460)  but not using your upper/lower side driver. Well it's not the same as using the Otto's way. I don't know the reason why...difficult to find a concrete reason!   Anyway with that arrangement I've not been able to obtain the same output as in standard configuration.

Roberto

Ah... was this a controled test? ... I mean did you start with a working device with three switches and then do a minimal modification to drive with a single switch? ... the most minimal modification would be to leave the device configuration exactly the same and simply drive via one switch.