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Originally Posted by KenWittlief
If you want to approach 90-95% efficiency with a sine wave output you are going to need something like a motor generator set: a motor that drives an AC generator. The speed of the driving motor will determine the frequency of the AC output. The output can then be full-wave rectified.
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If you want to see how to get a high efficiency power amp check out the sub-woofers from Sunfire. Carver has used a switch mode power supply on both rails, as the input waveform opens up the power supply on that rail tracks it. He then has a high current amplifier that only has 12 volts across it nominally, but can drive up to 300 volts peak to peak when required. It is fun to watch operating, but if you are ever looking at one be careful with it, 2 to 3 kW is not to be trifled with.