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Stefan Trethan
I said several times now the red waveform is NOT something you will see on a scope.
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It is what you get if you look at the furier analysis of the current. Basically you can describe any periodic signal with a number of sine signals with different phase shift and amplitude. the red one is the biggest one you would get, the first component of the furier analysis. you can get it in hardware by filtering a signal with a lowpass which cuts everything above the 50 or 60Hz of the mains. I don't want to do that because every filter has inductances or capacitances. The furier components are there without a fiter anyway, and the first is strongest, and it is the red sine. st On Mon, 19 Apr 2004 16:17:27 -0700, Scott Thompson <electronguy@...> wrote:
All this triac talk has got me thinking that I am going to need to perform some experiments myself. I've created a few magnetic drivers with MOSFETs, so I know how difficult inductors can be to drive, but I do not know how you got your red current waveform. I'm going to have to look at my scope for myself at the current/voltage relationship. If you're trying to charge a cap or an inductor, you would see a phase shift, but it doesn't make any sense that you would get a clean sinewave current waveform when you're only taking part of the voltage waveform. |
