my uncle gave me an old (broken, who knows how) 1800-watt true-sine power inverter, the kind used to run a small house off of car batteries

could be fun

I don't even know how true-sine inverters work, omg
is there... a rotor in there

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I have no idea if "true sine" really means true-true or if it just means "more finely stepped than a typical modified-sine inverter"

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"modified sine" is an A+ marketing phrase tbh
has quite a professional ring to it, unlike the more obvious "I can't believe it's not square wave" or "holy harmonics, batman"

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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

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@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.

@diodelass True sine wave inverting is done with high-frequency PWM (think: many many kHz). If the folks writing the control are good (i.e., very fast current loops), you'll see under 1% THD for resistive loads and less than 5% for non-linear loads.

@diodelass I sorta assumed it was the worlds most boring application of a DAC

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