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The first part of the image the PP2000 runs unit from itself and the second one is what AC is coming in. We see that some AC noise is coming on the negative side what the charger activated. You can get the frequency of the noise – it is 20uSec per square. Also the amplitude of the noise is very low – it is 0.02V per square, so in my mind the charger might works fine. I do not think that exist any higher frequency noise (I use slow 100MHz scope) as this all switching devised that works at 20-30kHz and would be not transparent for any noise over 10-15kHz. So, the interference between AC and DC operation is very low, not to mention that after first DC to DC up-converter it most likely shunted with a large cap that would ground all noise and interference.
The Cat |