Claimed OU circuit of Rosemary Ainslie

[Rosemary Ainslie]

Based on my theory of what's happening in the real world circuit to skew the alignment of the Drain and Source voltage wave forms, I tried a simulation.

There is sufficient trace to begin to see the effects I'm seeing in my wave forms.

.99

Poynt - not sure where you're going with this.  Are you suggesting that the measurements are out of line and should match the sim?  Or does the sim expose measurement errors - somehow?  Or are you simply trying to replicate the experiment on Spice.

I would be very interested to see if Spice could reproduce Fuzzy's #5 data - or close.  And thanks for the hard work Poynty.

[Hoppy]

Poynt99

You say in post 2113: "Notice how the cursor lines up with 0V on the shunt voltage? That means 0W of power at this instant in time, even though the drain voltage is at it's peak."

If the drain voltage is at its peak, this means that the mosfet has switched-off and no current is passing through the shunt.

Hoppy

[poynt99]

Poynt99

You say in post 2113: "Notice how the cursor lines up with 0V on the shunt voltage? That means 0W of power at this instant in time, even though the drain voltage is at it's peak."

If the drain voltage is at its peak, this means that the mosfet has switched-off and no current is passing through the shunt.

Hoppy

Correct Hoppy. However, if you examine the wave forms from the actual tests (mine and Glen's) I posted, you'll notice that current is present in the shunt at the instant the Drain voltage peaks. In fact it's there for the entire duration of that peak. This amounts to a significant skew in the power calculation when averaged over one cycle.

The last sim was a trial to see if I can reproduce this effect. It was only a first run and needs more work. I also forgot to change my reference point in the measurement.

.99

[PaulLowrance]

Also the load has capacitance. ... And lets not even get into inductance.

That's why from the start I suggested the sure method of measuring how fast each component will heat up in a given time period, and then compare that to the control experiment. That's very easy to do that.

[PaulLowrance]

402 SMD Thermistor: $0.15 each. x2 = $0.30