Plug packs

Waveforms

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

For comparison a PC power supply. Vertical scale is 0.4A/square

Harmonics

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