Partnered Output Coils - Free Energy

[tinman]

@Picowatt:

I'll jump in here with some information.  As I understand it, TinMan is isolating his FG and scope grounds, so he can connect the FG's "black" or BNC shield lead to the negative battery pole - mosfet Source point, and at the same time connect his two scope probes "across" the primary and secondary of the coil set. So your original suggestion that he connect the two coil "bottoms" together and connect both scope references there is still valid, since the FG's "ground" is isolated and no groundloop will be formed.

We've been discussing this on "that other" forum, but the latest set of waveform tests that he's posted have me confused again...

I've built up a driver circuit from his original schematic and tested it with a plain toroid with 10 turn primary and 30 turn secondary, with a small 12 volt bulb load, but my waveforms are very different from what he has shown. My build of the circuit also wreaks havoc with my regulated power supply so further testing will be using a 12v battery instead.

I had the same problem when trying to use my power supply-it just cant provide the instantaneous current required at switch on.
The schematic is below PW-and yes,my scope grounds are isolated from mains ground via the UPS.

[tinman]

Going to try a pot core,and a small toroid core mixture,and see how that go's.

https://www.youtube.com/watch?v=YIyQ-3LOdEU

[picowatt]

@Picowatt:

I'll jump in here with some information.  As I understand it, TinMan is isolating his FG and scope grounds, so he can connect the FG's "black" or BNC shield lead to the negative battery pole - mosfet Source point, and at the same time connect his two scope probes "across" the primary and secondary of the coil set. So your original suggestion that he connect the two coil "bottoms" together and connect both scope references there is still valid, since the FG's "ground" is isolated and no groundloop will be formed.

We've been discussing this on "that other" forum, but the latest set of waveform tests that he's posted have me confused again...

I've built up a driver circuit from his original schematic and tested it with a plain toroid with 10 turn primary and 30 turn secondary, with a small 12 volt bulb load, but my waveforms are very different from what he has shown. My build of the circuit also wreaks havoc with my regulated power supply so further testing will be using a 12v battery instead.

TK,

Thanks for the reply (and the heads up)...

I don't understand why you would be wreaking havoc with your regulated supply.  We've seen enough low side drivers (and all other manner of coil drives) from you to not expect you to be having any issues driving the primary.  Do you have some decoupling/supply stiffening cap(s) between the source and V+ right at the driver/primary?

My previous posts were more so to do with ensuring Tinman's secondaries were not opened or that there was some other issue that was inadvertently cap coupling the secondary to the scope.  That seems to have been ruled... 

However, the inline battery test (two videos back) seemed a bit strange.  The scope showed the battery's positive DC voltage (offset) indicating everything is indeed DC coupled and has continuity, but when the drive was turned on, there was still what appeared to be around -3V at the secondary during the off period.  As I thought that -3V was about what was being observed as the secondary baseline during the off period without the inline battery, I would have thought that the observed secondary off period baseline voltage would have reflected the battery's offset and been closer to -2V (the actual voltage is difficult to tell from the scope shots in the video but it appears that the scope is set to 5V per div and that there is greater than 1/2 a division of -DC during the off period even with the battery in line).     

The duration and flatness of the observed -DC offset during the secondary off period sure looks more like it should be the "return to ground" point as opposed to a steady offset.  I would question everything, including the scope, prior to fully accepting that amount of offset as being "real" (as in the load actually being driven during that period).  Perhaps scoping a CSR inline with the bulb would be telling.

Also, as I am unfamiliar with Tinman's scope, I cringe a bit every time I see the waveform exceed the vertical limits of the scope's screen.  However, it does appear to be handling those "beyond the screen" excursions without clipping or producing any offset in the displayed waveform.     

I'll look at other postings "elsewhere", but perhaps Tinman could post his original drive schematic and FG/scope connections.   

PW

[picowatt]

I had the same problem when trying to use my power supply-it just cant provide the instantaneous current required at switch on.
The schematic is below PW-and yes,my scope grounds are isolated from mains ground via the UPS.

Tinman,

It appeared in your video that you are applying +/- 6 volts of drive to your MOSFET circuit.  The 1K/10K divider (R1/R2) will reduce that to 5.45V.  It looks like that MOSFET has around .5R on resistance with 10V on the gate.  With 5.45V applied to the gate, I would not expect the MOSFET to be fully on.

Did you have to make the value of R1 as high as you did for a reason (stability, etc)?  Given the MOSFET's rather large gate capacitance, I would want to reduce R1 significantly to increase switching speed and reduce dissipation.

Also, I am not a big fan of driving the gate that far below the source as you are doing.  I'd dial in a bit of offset at the FG so that the gate drive was more like 0 to +10V (and with a greatly reduced R1 resistance).

The above discussion is only with respect to MOSFET dissipation and not the observed offset seen on the secondary during the off period, so take it all with a grain of salt.

PW

[poynt99]

Brad stated in the video that the reason he was driving the gate negative, was to ensure the FET switched off faster, and not to depend on the 10k gate resistor to "pull it down".

Brad, you aren't really depending on the 10k to pull down the gate, because your FG will be doing that. The FG is not an open-collector type so even though a pulldown resistor is always a good idea so the gate is never floating, it is doing little in regards to switching the gate off; your FG is doing that for the most part. If you readjust the gate drive to 0V~+10V, I doubt you will notice much if any difference in the switch-off.

.99