Discussion
Why can a class D stage exceed ninety per cent efficiency?
Answer: D
Dissipation is the product of current and voltage, and a device that is either fully on, with little voltage across it, or fully off, with no current through it, has a small product in both states. The filter passes energy to the load rather than returning it, temperature is a consequence, and conduction angle is not the relevant description. Reducing the overlap of current and voltage is the general route to efficiency, and switching reduces it as far as it can go.
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