cupoftea
Advanced Member level 5
We are all lead to believe that we are in the realm of Sic diodes for Boost PFC.
And then Infineon make an Eval board for dualled 2.5Kw PFC’s…..
https://www.infineon.com/dgdl/Infin...N.pdf?fileId=5546d46278d64ffd0178f986f0b708d4
…and just use cheap Ultra-Fast diodes…….with trr worse (greater) than loads of other ultra fast diodes on the market.
They use ID60C65D1 (approx. £1.42 at 1000 pces)
https://eu.mouser.com/datasheet/2/196/Infineon-IDW60C65D1-DS-v02_01-EN-1226644.pdf
…trr from 70-110ns
There are load of sub 50ns on the market, albeit more expensive……
RFS60TZ6SGC13 ($2.52 at 1000 pces)
https://fscdn.rohm.com/en/products/...crete/diode/fast_recovery/rfs60tz6sgc13-e.pdf
The IGBT they use has practically no tail time (16ns)....and a vce(on) of 1.65v at 40A, 175degC.........i think we can say goodbye to FETs for high power PFC? I wouldnt be surprised if a FET wouldnt lest long in that 2.5kW PFC with that cheap UF diode?
Would you say that its because this Eval board uses an IGBT (60khz), that it is OK to use the non SIC diode?
So would you agree that high power CCM Boost PFCs are better done with "IGBT + Ultra fast diode"…..as opposed to "FET and SIC diode"?
If you can switch a cheap UF diode like that, in a CCM 2.5kW boost, it makes you think that doing a 2.5kW hard switching full bridge at 60kHz also wouldnt be too bad? Who needs resonant LLC converters for high power?
And then Infineon make an Eval board for dualled 2.5Kw PFC’s…..
https://www.infineon.com/dgdl/Infin...N.pdf?fileId=5546d46278d64ffd0178f986f0b708d4
…and just use cheap Ultra-Fast diodes…….with trr worse (greater) than loads of other ultra fast diodes on the market.
They use ID60C65D1 (approx. £1.42 at 1000 pces)
https://eu.mouser.com/datasheet/2/196/Infineon-IDW60C65D1-DS-v02_01-EN-1226644.pdf
…trr from 70-110ns
There are load of sub 50ns on the market, albeit more expensive……
RFS60TZ6SGC13 ($2.52 at 1000 pces)
https://fscdn.rohm.com/en/products/...crete/diode/fast_recovery/rfs60tz6sgc13-e.pdf
The IGBT they use has practically no tail time (16ns)....and a vce(on) of 1.65v at 40A, 175degC.........i think we can say goodbye to FETs for high power PFC? I wouldnt be surprised if a FET wouldnt lest long in that 2.5kW PFC with that cheap UF diode?
Would you say that its because this Eval board uses an IGBT (60khz), that it is OK to use the non SIC diode?
So would you agree that high power CCM Boost PFCs are better done with "IGBT + Ultra fast diode"…..as opposed to "FET and SIC diode"?
If you can switch a cheap UF diode like that, in a CCM 2.5kW boost, it makes you think that doing a 2.5kW hard switching full bridge at 60kHz also wouldnt be too bad? Who needs resonant LLC converters for high power?
Last edited: