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Old 10-21-2015, 03:18 PM   #2213 (permalink)
thingstodo
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Quote:
Originally Posted by e*clipse View Post
If thingstodo, Paul, or anyone hanging around here have found different results in their real world testing. Please let me know - i'd like to make a useful model for this problem.
As for currents - V*I into your controller = V*I out of your controller, so if your input voltage is 100VDC and your output voltage is 7.17VAC (10 VDC peak to peak as an RMS value) then your current is 10X more on the output than on the input. That's one of the beautiful things about low ESR Capacitors as energy sources. Coulomb counting helps - you can't get more out of the capacitor than it can hold .. unless you count the charging current that the capacitor receives as the output voltage drops.

The currents through the diodes .. normal for IGBT on, but should relate to the energy stored by the motor's magnetic field, as it collapses when the IGBT turns off. The amount of time to collapse the field, and how the series resistance is split up in your model would likely have a large effect on the magnitude.

If you have anything in particular you'd like me to check during testing - a diagram helps. I have several uncalibrated 50A 100mV shunts, a clampon meter, 2 channel scope ... a couple of cheap multi-meters .. and I can take video of the measurements.
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e*clipse (10-21-2015)