Graham Gunderson's Energy conference presentation Most impressive and mysterious

[gotoluc]

Good morning Gotoluc,

Going to try this again, first post never showed up. Could you post a picture of the setup that made this waveforms.
Your description as to how it works and built is easy to understand.  Any description
of the exact construction of the coils/core/magnet assembly would really help.  Your device
is electrically so much simpler that Gundersons and the aux. cicuit to harvest the output pulse during the rest would be just as simple.
This is going to be my first try at replicating your circuit..

Respectfully

Ben K4ZEP

Hi Ben,


nice to see you here


the coil was around 10mH with a ferrite core. Use your signal generator (at 33% duty cycle) to turn on and off the mosfet's current to the coil which has a .002uf  to .005uf cap connected in parallel across it. Tune the frequency till you get (single Wave Ring) Resonance.


Kind regards


Luc

[Spokane1]

Thank you, but it doesn't really help me much. I'd rather not speculate.

The pictures almost raise more questions than they answer; for example, why are there two scope probes on the output circuit side? Is he doing a differential voltage measurement and using A-B math on the scope?

I would suggest if you do come up with a diagram, post it here and also send it to Graham for his review and approval. If he gives it a thumbs up, then at least we have a starting point.

At the moment, I have no idea what the input source is even.

Dear poynt99,

According to what Graham said in the lecture he was using a single 10X 10 Meg probe for his output scope voltage measurement. The second probe was used to temporarily connect to a different part of the circuit for a different scope shot for some topic in the presentation. You will have to wait for the DVD download the fill  in the details,

He used the differential voltage for the input scope voltage measurement because of its magnitude of 800+ Volts

Graham is not going to review my drawing and I'm not going to approach him until I have built a functioning where I can show him all the switching wave forms and what ever performance I can measure. Then I shall be ready for the master to bestow upon this novice the next step in understanding.

Scope math was used for both the input wattage and the output wattage. The data was parsed at 10 MHz and multiplied and then integrated to produce the real time wattage measurement.

The input source is a common linear Full Bridge Rectifier 220 VDC power supply with an inductor and a large capacitor for the filter section. The transformer was a 120VAC to 220 VAC ratio unit. I would say it would be rated at about 300 watts. We have some good photos of this power supply. I was going to bring them out when I compose the schematic. Since this is such a trivial part of the apparatus I haven't brought it up. I'm going to use a surplus B+ supply that has a regulated variable output - the price was right.

again Have a good evening

Spokane1

[Spokane1]

Hi Ben, nice to see you here
the coil was around 10mH with a ferrite core. Use your signal generator (at 33% duty cycle) to turn on and off the mosfet's current to the coil which has a .002uf  to .005uf cap connected in parallel across it. Tune the frequency till you get (single Wave Ring) Resonance.

Kind regards

Luc

Boy that sounds interesting!

Spokane1

[TinselKoala]

If a component or subsystem is necessary for the operation of a device, then the input power to that component or subsystem _MUST_ be included in the "input power" measurements of the device. Especially when overall COP is concerned. Anything else is not only incorrect... it is dishonest.

It is kind of like saying that the cost of a car trip is just the cost of the gasoline. Of course the _true_ cost of any car trip has to take into account the cost of the car itself amortized over its lifetime, maintenance, oil, wear on tires, insurance, registration, safety inspection and etc. All these items must be paid for in order for the car trip to take place.

Similarly, all necessary components of an "ou" device that receive power from any source -- especially from conventional electric power supplies -- must have their input power included in the input power to the "ou" device.

To answer one specific question about mosfet leakage from Gate to the Drain-Source circuit, consider that the mosfet Gate is essentially a capacitor. Like any other capacitor it can leak AC power to the Drain-Source part of the circuit. How much depends on the actual capacitance and the frequency and other parameters of the drive. If the power supplied to the Gate drive circuitry is ignored, and the power being switched by the mosfets themselves is ignored... yet these components are needed for the device to work.... why, using these tactics just about any device can be claimed to be "overunity" by a large margin.

For example, take my "microQEG" device. Since _all_ the input power to this device is being used to drive the mosfet gates, and is being switched by the mosfets themselves, I can just ignore it, just as the input power to Gunderson's H-bridge and synchronous rectifier mosfets is being ignored. So my device runs on _zero_ input power, by the same logic that seems to be used in saying Gunderson's device uses "0.000 watts" input power. And it lights up light bulbs too !

[TinselKoala]

Regarding the input power measurement and a potential source of error;

1) how long is the wiring between the h-bridge and the transformer?

2) which end are the current and voltage probes placed, near the h-bridge end or the transformer end?

It seems rather obvious to me that positioning a Hall Effect current probe quite near a source of external magnetic field is not "best practice". The external field is going to affect the accuracy of the measurements taken with that probe. For accurate performance the _only_ field anywhere near the probe should be that induced by the current flowing through the conductor being measured.

In fact this is usually mentioned in application notes and instruction manuals for these probes.  When using Hall Effect probes on unknown circuitry, it's a good idea to confirm the probe readings by comparison to current readings taken by another method, such as the voltage drop across an inline current-viewing resistor.