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Differences between MOSFETs

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currentkills91
Tue Jun 21 2011, 10:24AM Print
currentkills91 Registered Member #3831 Joined: Thu Apr 14 2011, 02:54PM
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Posts: 265
Okay, so I was building a tiny little zvs cap charger, and I was just wondering, how much of a difference in performance would I see if I went from a 200v MOSFET to a 150v MOSFET? Now i'm just interested in what would happen if I changed the MOSFETs voltage rating, just assume all other ratings stay the same...
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Daedronus
Tue Jun 21 2011, 02:22PM
Daedronus Registered Member #2329 Joined: Tue Sept 01 2009, 08:25AM
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Posts: 370
no change at all?

If you get over the voltage rating you destroy the mosfet, if not, you are doing fine.

Unless is a short avalanche event, but that only happens with flyback mode drivers.

ZVS is a transformer driver, but it's not a flyback mode driver.

ZVS is push/pull, so you need to stay 100% of the time under the mosfet voltage rating.

Just get the lower RDSon mosfet you can get, that has a voltage rating of about 4x of the input voltage.
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currentkills91
Tue Jun 21 2011, 02:35PM
currentkills91 Registered Member #3831 Joined: Thu Apr 14 2011, 02:54PM
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Posts: 265
Okay thank you (: I just wasnt sure as it seems everyone uses 200 volt fets...so ill actually op-out for 100 volt ones...thanks again
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