Humming inside the TT
Not that it bothers me or keeps me awake, but what is that humming sound inside the RV when the shore electricity is plugged in?
Forum Discussion
SoundGuy wrote:rrupert wrote:
The transformers in converters can have an AC hum. The plates can vibrate from the magnetism generated by the wire coil. It sounds like the humming that comes from florescent lights.
Converters for many years now have been all solid state and don't have any transformers in them.
The answer as to why the converter hums is obvious - it doesn't know the words. :p
Solid state doesn't necessarily mean there are no transformers. In fact that usually refers to not having mechanical devices like relays. Switching power supplies have at least two transformers: 1 to reduce the incoming line voltage down to lower levels before converting to DC and another that is used in the switching. PD's patent has the word "transformer" 93 times. https://patents.google.com/patent/US7782002
That initial step-down transformer will be switching at the 60Hz line frequency and could hum some, though probably not loud like a large high voltage circuit breaker panel.
