anyway, I suppose a true-sine inverter could be, like, a really advanced variable-output switched mode supply with a whole lot of very active parameter adjustments
@diodelass Per a bunch of TI Design Notes, "Pure" sine wave is just PWM switched FETs at a frequency such that the harmonics are way way above 60hz. Some include output filters to reduce those harmonics even more.
If it's better than average grid power, it's "pure" sine wave.
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