Plug packs: Difference between revisions
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[[File:Fourier analysis.jpg]] |
[[File:Fourier analysis.jpg]] |
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[[File:Plugpack harmonics.xls]] |
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Revision as of 10:50, 4 December 2010
Charger input waveforms, 0.2A/square, screen edges and centre are the input voltage zero crossings
Green wallwart AD5953 ALF, XO1.5 running 93% charge 240V input
as above but run on battery power to 80% then plug in
Green wallwart Delta ADP17FBA, XO1.5 running 93% charge 240V input
White wallwart Bestek NA0241WAA, XO1.5 running 93% charge 240V input
The load is well balanced with respect to leading/lagging power factor, showing only a slight leading or capacitive power factor. The waveform is very rich in harmonics. This could lead to overheating in transformers and generators due to eddy currents.
A harmonic analysis on the following approximation of the waveform
yielded this result
