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If frequency accuracy is not important there are two ways I would consider. One would be to run a class D amp at 400 Hz with 320 volt peak-peak output. The output is neither isolated or a sine wave, but by limiting the duty cycle, it may work well enough.<p>The other way should overcome the limitations above. It would involve using two SMPSs--one to produce the positive half of a 400hz sine wave and the other the negative half. If you are more of a perfectionist, you could chose this way. See http://groups.yahoo.com/group/switchmode/ for more information.
As Joseph said, in the interests of efficiency the best choice would be class D. <p>If efficiency isn't a serious consideration a more "conventional" way, and probably electronically less neurotic, is simply a class B amplifier with suitable output transformer and oscillator/driver. That does, however means you will have to dissipate nearly 400W of heat at full load!<p>California Instruments used to sell such power sources. We have a 3-phase one at the place I work and I had to put together a 3-phase exciter for it.
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