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Old 21st March 2006, 02:47 AM   #11
Eva is offline Eva  Spain
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BCA solves the body diode problem and reduces output ripple at low voltages, but it requires four inductors rated at the full maximum peak output current for a full bridge.

SiC diodes solve the reverse recovery problem at the expense of showing conduction losses similar to the ones that you would obtain by paralelling 60V schottkys until the required voltage rating is achieved (and they are not particulatly cheap).

Also, isn't BCA patented by Crown and not freely useable in commercial products for the next 15 years or so?

Damn!!!
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Old 21st March 2006, 09:37 AM   #12
mzzj is offline mzzj  Finland
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Quote:
Originally posted by Eva
BCA solves the body diode problem and reduces output ripple at low voltages, but it requires four inductors rated at the full maximum peak output current for a full bridge.

SiC diodes solve the reverse recovery problem at the expense of showing conduction losses similar to the ones that you would obtain by paralelling 60V schottkys until the required voltage rating is achieved (and they are not particulatly cheap).

Also, isn't BCA patented by Crown and not freely useable in commercial products for the next 15 years or so?

Damn!!!
There is no such a thing as free lunch

10pcs of shottkys? Sic is not that bad.

Note that SiC-diodes are not that bad compared to ordinary ultrafast devices, for example MUR1560 has forward voltage drop of 1.5v vs Cree CSD20060D 1.8v
At higher temperatures things dont look so nice as its something like 1.2v for mur and 2.4v! for SiC. But you dont want to run your Si-diodes at Tj=175c anyways because reverse recovery charge multiplies by quadrillion.

Yeah, not for commercial desings Problems with Teetee's inverter?

Speaking of shottkys, use of low voltage shottky and ultrafast recovery diode to bybass mosfet body diode might be one option at these voltage levels.
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Old 21st March 2006, 09:42 AM   #13
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Guys!

Bear in mind the original poster. I think Helen might want something a little more practical in the way of help. Abstract component discussions are fine, but not entirely relevant here!
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