Exactly my point, David. And switching speed is critical for EFFICIENCY
in power systems -- it is unrelated to the "speed" of Si. Those
switching devices would "fry" if slowed down, because power is burned
during that switching time, in addition that burned when the device is
in the "On" state.
I think Ed's reading is solid.
73, Jim K9YC
On 12/16/2021 12:49 PM, David Eckhardt wrote:
Yes, they have to generate RF energy when multi-amperes are rapidly
switched. BUT,.......they should be constructed such that they do not
RADIATE that energy. There are two sides to the RFI/EMC "solution": 1)
attempt to not generate RF energy - about impossible with the high
speeds of silicon today, and, 2) if they must generate RF energy,
prevent it from being radiated (or conducted).
So, according to Ed Hare, ARRL, solar power systems might fall under
Part 15, Subpart B, as unintentional radiators as an "appliance". This
would require passing both radiated emissions (minimum 30 MHz through at
least 1 GHz as an entire system - including simulated house wiring!!)
and conducted emissions (150 kHz through 30 MHz on the AC side).
Clearly, they do not. Even the Part 15, Subpart B, unintentional
radiator limits, would get under the skin of most amateurs operating HF.
So, are single-family home solar power installations considered an
"appliance". Personally, I have trouble with that, but let's _not_
involve the lawyers as we'll get something we really don't want!!!😖😫😕
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