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4hv.org :: Forums :: High Voltage
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Half bridge flyback questions

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Alex M
Tue Jul 09 2013, 02:33AM
Alex M Registered Member #3943 Joined: Sun Jun 12 2011, 05:24PM
Location: The Shire, UK
Posts: 552
Sigurthr wrote ...

I found that adding an external diode to MOSFET half bridges lowers the junction temp of the chip by about 30%. It is totally worth it imo.

Was that using a Schottky or just a regular fast recovery diode?
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Sigurthr
Tue Jul 09 2013, 03:22AM
Sigurthr Registered Member #4463 Joined: Wed Apr 18 2012, 08:08AM
Location: MI's Upper Peninsula
Posts: 597
Just a mur860.
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Daedronus
Tue Jul 09 2013, 08:10AM
Daedronus Registered Member #2329 Joined: Tue Sept 01 2009, 08:25AM
Location:
Posts: 370
or you can use a IGBT without the body diode or a integrated diode, and pick the external diode of your choose, probably overkill.
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Alex M
Tue Jul 09 2013, 04:10PM
Alex M Registered Member #3943 Joined: Sun Jun 12 2011, 05:24PM
Location: The Shire, UK
Posts: 552
On mine I found that a small common mode choke on the short wires going to the transformers primary helped to reduce FET heating a little, but I have some MUR460's spare that I will add across the FET's too.
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