Pure sine wave inverter

How do pure sine wave inverters make pure sine wave? I want to know how pure sine wave inverters convert 12 volts DC to 120 volts AC, down at a circuit and component level. I've searched the internet and only found what pure sine wave inverters do, not what makes them tick. Pure sine wave inverters are different from modified and square wave inverters in that they produce clean pure sine wave, the same stuff that comes out of the wall outlets. I just want to know what components or what circuits inside of a pure sine wave inverter makes it possible for the inverter to produce pure sine wave.




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