120v Feedback from Appliance to Inverter?

BFL13 wrote:
I thought I was getting something I was looking for when Gordon Three posted:

" A well designed appliance or device should not pollute the upstream supply with noise. That said, it CAN and WILL happen. My Vizio TV does "something" to the AC supply coming from my Magnum, such that I can hear a pitch change in small ac-powered fans that are running when I turn on the TV. The TV takes an AC cord directly, there's no external power brick. It could be the TV's active power factor correction circuitry is cleaning up the AC waveform in some manner.

I recently bought an induction cooktop, a cheap Chinese unit from Amazon, and it puts out all sorts of noise, I don't know if it's radiated or on the AC line. Often it causes my infrared remote control to stop working for the TV.

The inverter does have filters on the AC output stage, since the PSW starts life as an MSW, just with many more steps. That MSW runs through filters and smoothing and comes out "pure". Those filters will help to protect the inverter's output stage (mosfets) from noise "

But then he and the rest seemed to go against that later on--I am unclear on the whole thing, still.

Share with us what sort of problem you're experiencing?

I had a long reply for you typed up but Marcus deleted it with his blasted Captcha nonsense. In frustration, I didn't feel like retyping it as DrewE's post mostly mirrored my thoughts.

Electrical devices that share a common connection are going to both produce and receive interference from each other to some small degree. It's a bigger issue with switching power supplies, because of how they operate, taking small bites out of the AC supply to charge and discharge capacitors and inductors to produce a different output voltage.

Will that interference cause an issue? Not likely. The pitch change I hear in my small fan motors, it's not imaginary, but it's not significant enough that I want to get my oscilloscope out to see what if anything I can see on the AC waveform.

While not a signal, I think power factor is the largest issue that would affect an RV inverter system, other than a damaged appliance containing a bad motor or capacitor.