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Since87, low frequencies are harder to filter, but are they not also lower efficiency? The higher the frequency, the more losses you get from transition time. Higher current switching elements (whether they are FETs, IBGT's or whatever) have slower response time.
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Resonant techniques can be employed to minimise conduction and transistion losses. There are mighty FETs avaiable which have very low on-state resistance (and hence low on-state losses).