Graham Gunderson's Energy conference presentation Most impressive and mysterious

[poynt99]

Even though the current and voltage are 90 degrees out of phase, the _current_ is very real and in the devices we are discussing can be pretty large, tens or even hundreds of amps. This current produces a very real, changing magnetic field, which in turn can induce a voltage in another magnetically coupled coil, even at some distance. Can this induced secondary voltage then provide real power to a load?

A simple yes or no would suffice. Can there be real power measured and delivered to the load in the setup shown in my diagram, assuming a non-OU device as the DUT?

[poynt99]

Well, then, my measurements of my devices definitely qualify, because there is very little distance between the thick PCB traces that connect the mosfet Drains to the capacitors of the tank circuit and the primary coil, and I am attaching my probes quite near the board or even sometimes directly to the mosfet drains, whereas the coil itself has perhaps 6 cm (x2) of straight wire standing it off of the board. The 0.25 ohm non-inductive Ayrton-Perry-wound current-viewing resistor pair is at the board end of one of the coil legs.

However as you have poynted out, Gunderson's measurements are apparently taken nearer to the transformer rather than directly at the H-bridge output. The actual distance is unknown (at least by me).

What frequency is this device running at?

[Spokane1]

Obviously I disagree.

Furthermore, what do you make of this statement:If by "back end FETs" he means the H-bridge, then it becomes very clear that the exact specifics of the H-bridge and its drive parameters are critical to the performance of the entire unit. Therefore the power supplied to the H-bridge is part of the power necessary to produce the effect and must be included in the "input power" for the COP calculation. Ditto for the FETs in the "synchronous diode".

Dear TinselKoala,

Graham was referring to one of the Synchronous Diode FET's that he pointed out and put his fingers on when commenting on the impact of placing that a pF capacitor at that location.

Spokane1

[Spokane1]

Dear Builders,

While a most interesting discussion rages between the measurement specialists the rest of us builders can get down to the real task at hand. Here is a first run dissection of the logic board. More details to follow this week as I get time at work to draft the actual schematic.

Spokane1

[TinselKoala]

What frequency is this device running at?

The MicroQEG runs at about 300 kHz and the wireless transmitter/receiver systems run typically around 800-900 kHz.

Here's an image of one of the wireless transmitter systems under construction. Missing are the chokes, heatsinks and single-turn output loop.