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"Swinging" inductor for CCM PFC
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jbb:
Yep. They cost more :-)

SiC MOSFETs may need a bit more gate drive (eg 18 - 20V, see device datasheets). Also, the standard TO-220 and TO-247 packages aren’t good because their lead inductances compromise the switching behaviour.


GaN devices are generally a little trickier to drive, depending on the types used. You could start with some searches.
NiHaoMike:

--- Quote from: TimNJ on July 03, 2019, 05:17:54 pm ---We are trying to get improvement at 50-100% load. (That's a pretty big range, I know. Maybe we can call it "75%".)

Do you mean gating off the transistor completely near the AC zero crossing? Or some sort of burst-mode?

--- End quote ---
The gating trick probably will not be effective at high load. It works at light load by not running the converter when its efficiency is low, but at higher load, the increase in RMS current will likely undo any efficiency gains. It also would be limited by the power factor target at load levels where it applies.
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