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Use numerical integration on specific areas of graph

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Greg
Greg 2022-8-7
评论： Greg 2022-8-9
Hello
I'm doing some double pulse testing, and I'm trying to post process the results. I can get the rise and fall times of the signal relatively easily from the signal processing add-on, but I am struggling to understand how to calculate the switching losses easily. The graph I end up with for the power loss (voltage*current) is looking like this:
and I would like to integrate the power versus time only in the spots the spikes appear. For example in this region while zooming in :
Right now, I am brushing and exporting data, which I'm sure is inefficient. Does someone know a fast way to achieve these calculations?
Many thanks in advance.
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Walter Roberson
Walter Roberson 2022-8-8
You could take the peak location and search for the first point to the left and right that are <= 0 . But if you have phase on your peaks then it is common for the pulse to go below 0.
If you
outside = find(data <= 0);
before = interp1(outside, outside, PEAK_LOCATIONS, 'prev');
after = interp1(outside, outside, PEAK_LOCATIONS, 'next');
then you can code the searching in a small number of lines.
Greg
Greg 2022-8-9
Thank you @Walter Roberson, This has now been fixed according to your suggestions.

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