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Old 01-21-2015, 01:57 PM   #1625 (permalink)
e*clipse
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Quote:
Originally Posted by cts_casemod View Post

I also received a sic diode and replaced the hyper fast diode on my PFC converters with it. Surprisingly the losses increased by 4W with equiparable heatsink temperature. Both are rated to 8A with the Si having a worst case recovery time of 30ns.

This was tested at 120KHz and a current of 2.90A @ 415V.
Perhaps only worth it above 200KHz??
That's very interesting. Would you mind sharing the part numbers for the two diodes? This is mostly due to increased conduction losses?

I'm in the middle of designing the power stage of this inverter for using SiC switches (both mosfets & diodes), and this looks like some good "sanity check" type experience.

Thanks a bunch,

E*clipse
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