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Efficiency
It makes sense that part of the losses are overhead - switching, powering the electronics, that sort of thing. So the more power you put through, the lower the percentage of the overhead, the better your overall efficiency.
There SHOULD be a component that is a percentage of the power in - resistance losses in the IGBTs, traces, etc - anything to do with current.
Perhaps everything is oversized so much (well, I guess that part is not perhaps ... everything IS oversized so much) that the overhead losses are visible and the percentage losses are miniscule by comparison?
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