Dual boost PFC summary
This is a unipolar topology
– Superjunction already works well
– Body diode performance is unimportant
Switch losses are dominated by:
– Conduction (especially severe for high ripple CrCM and DCM)
– Turn-on speed
– Eoss (only for CCM)
– Turn-off speed
Possible switch improvements
– For a given Rds(on):
– Reduced Eoss (stored energy in device Coss)
– Reduced Qg to enable faster switching
APEC 2015 Seminar S17
19
Tradeoff: eliminate 1 diode drop, add an entire boost stage