I made a mistake. As you might have noticed I measured the power consumption of the RF and ESP light bulb in my previous video. I completly forgot that such SMPS do produce a phase shift of the fundamental wave by not drawing sinusoidal current.
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- could you please specify what has been misured in picture 1 and what in picture 2?Jan 22, 2016
- does your oscope export the measure, with Scilab or Matlab we can measure easily the W with an integral.
Assuming that the first measure is with the bulb at full bright, you have a time shift near 2.5 ms that is mostly cosphi 0.6-0.7.
If the measure two is with the bulb at low brightness, you can no longer apply a cosphi because is not a sinewave and the relative position of the peak isn't related (and may vary at each time that you unplug and replug the power).
It would be great if you could also provide the scaling factor of your probes.Jan 23, 2016
First picture is the lg bulb. Second one is the RF and ESP one at full brightness. The cos phi applies to the fundemental wave of the peak current wave.Jan 23, 2016
- I was clearly wrong because the fundamental wave is at 50 Hz.
Have you interest in getting deeper on this?
Authometion has provided me the measures with a Wattmeter and are with a 8.7 W at full bright.
A question is the shift between V and I always the same? In a switching power supply this is not always true.Jan 30, 2016
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