It's pretty common for most cooking appliances, microwaves particularly to run power fully on-off to give you a percentage (bang bang control) as opposed to PID control which would run the element / wave generator at a duty cycle
Any microwave that is not LG or Panasonic will be on / off, as they won't have an inverter - Panasonic own the patent, and LG are the only licensee.
Interesting, I don’t work on microwaves specifically, but I knew bang/bang control was super common on them.
I coincidentally can get staff rates at Panasonic as F&P are weirdly the local distributor for them here.
@NotThamesWater started
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It's pretty common for most cooking appliances, microwaves particularly to run power fully on-off to give you a percentage (bang bang control) as opposed to PID control which would run the element / wave generator at a duty cycle