On Thursday, 21 March 2019 10:26:42 UTC, J.B. Wood wrote:
On 3/20/19 9:50 PM, tabbypurr wrote:
On Wednesday, 20 March 2019 16:38:13 UTC, J.B. Wood wrote:
Hello again, everyone. I did some further online research and it
appears modern inverters use fast-switching insulated-gate bipolar
transistors (IGBTs) in sine-wave and modified sine-wave inverter
designs. My guess is that a microprocessor controls IGBT firing times
as well as engine speed (in an inverter generator) as AC output loads
increase and therefore demand more DC at inverter input. The
microprocesser itself would rely on a crystal as the reference time base
(frequency) source which would ultimately determine the inverter's
output frequency (e.g. 60 or 50 Hz +/- some acceptable deviation). So
the crystal has to remain reasonably stable in a variety of operating
environments. Sincerely,

why would they waste money on a crystal?


NT


Hello, and what do you mean by "waste'? Microprocessors typically use a
crystal as a timebase. While I appreciate all the responses to my OP,
It appears no responders have intimate knowledge of the subject internal
circuitry. If I did, I wouldn't have posted. The 50 or 60 Hz output of
the inverter-generator has to be traceable/locked to some internal time
reference, not the rpm of the engine. A crystal seems a likely
candidate as I don't think these appliances have an internal cesium or
rubidium clock :-) Sincerely,

Welcome to the filter.