Claimed OU circuit of Rosemary Ainslie

[MileHigh]

Rosemary:

I am glad that you are all excited!  It looks like Glen recorded and made available data for two out of his three trials that can be crunched down into power consumption data.

Harvey's preliminary data is indicating positive average battery consumption, but I am just a teenie weenie uncomfortable with the data sample he used to crunch on.  I am not sure how fast the actual data is being sampled, the display capture is showing Moire patterns but that means nothing about the sampling of the actual data.  Personally I would crunch on the data associated with one of the scope captures that shows three or four cycles.

I just looked at a data file and see the DSO dump is 10000 points.  I can just guess that the sampling for Harvey's crunching is pretty darn good.  That's in contrast to sampling only three cycles with 10000 points which would be pretty awesome.

Assuming that Glen does the thermal profiling sometime soon, you will be in a position to calculate some COP values.  I am not sure if he indicated the precise value of the shunt resistor, which of course is extremely important.

Also, I don't play Bridge!  El Cluelesso there.  There is a whole on line card/Backgammon/Hearts/etc culture out there.

MileHigh

[fuzzytomcat]

Assuming that Glen does the thermal profiling sometime soon, you will be in a position to calculate some COP values.  I am not sure if he indicated the precise value of the shunt resistor, which of course is extremely important.

MileHigh

Hi MH,

I'm still in the getting data mode process before Tektronix's will want there TDS 3054C back ...... maybe they will give me more time now ...... and thankfully other members are stepping up and helping out with the data recovered ..

The shunt resistor is a -
Dale RS-2B .25 ohm 3 watt 3 %
http://www.diyparadiso.com/componenten%20passief/dale%20rs5.pdf

I'm still stewing on the thermo data and how possibly to get a hard copy for a record that can be reproduced by others for verification purposes inexpensively ...... the "open source" code 

Fuzzy   

[MileHigh]

.99:

I am going to briefly try to finish off the ringdown if you and others will indulge me.

Referencing the third graph in the original post:
http://www.energeticforum.com/69850-post2875.html

And the first graph in this post:
http://www.energeticforum.com/70025-post2893.html

Do you notice how the big drain spike actually has two parts?   The first part being a sinusoidal stray capacitance charging phase, and then a regular RC exponential decay curve through the 10-ohm resistor and the body diode for the second phase.

There is a glitch during the discharge and I assume that is the body diode shutting off then the inductor spikes some current through it again.

I am not sure what you guys/gals mean by a "freewheeling diode?"  I am trying to pin down the mechanism for initiating the reverse current flow.  Certainly you can see that when the current is at zero, the fight with the switching off MOSFET has already pumped the potential to 100 volts.

It looks to me that at that point in time, you have a cap charged to 100 volts that is capable of discharging through the coil + 10-ohm resistor + battery + shunt resistor + body diode.  At the same time the coil has another 100 nanoseconds worth of discharge power charging the capacitance.  The coil has current going through it in two different directions for a certain net current.  Or am I missing something about the "freewheeling diode?"

Whatever is going on, it looks like once the MOSFET switched off completely there is already high potential associated with the LCR circuit ready to push current in a counterclockwise direction and it is directly proportional to the potential of the drain node.  If I put an imaginary "phantom (freewheeling?) diode" across the coil, then indeed there is a parallel path for the capacitance to start pumping current in a counterclockwise direction.

MileHiigh

[MileHigh]

Hey Mr. Fuzzy man,

I mean measure the resistor with your best multimeter.  The resistor spec is +/-3%, a 6% total possible variation in the value.  Your best multimeter might measure resistance with a +/-0.5% margin of error.

If you share your thermal data, it should be useful for people using the identical components that also replicate your suspended in air setup.  Otherwise it will serve as a guidline so that others have a sense for what their own data should look like.  Excel can plot it for you, and probably can even do curve fitting.  Harvey seems to be the spreadsheet guru, perhaps he can help you out.  Plan B is easy and very good - plot it yourself on graph paper and snap a jpeg pic of it.

MileHigh

[poynt99]

Glen.

May I ask where your scope probe that's monitoring the battery voltage is located exactly?

i.e. is the scope probe clipped on to the resistor or is it clipped on to the battery + terminal?

Where are the probe grounds connected?

.99