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Heating in LLC HB mosfets ?
Heating in LLC HB mosfets ?
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Old Yesterday, 05:37 AM   #51
voltwide is online now voltwide  Ireland
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Your test indicates that magnetizing current was way too high, so the MOSFETs heated up according to conduction loss Rdson*Irmsē.
You should learn to measure primary current and simulate the primary tank with LTspice.
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Old Yesterday, 06:17 AM   #52
TroelsM is offline TroelsM  Denmark
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I see the point about the lead-inductance. I'm pretty sure it s a 400V part. Still bordeline, but it was only for a test.
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Old Yesterday, 07:58 AM   #53
TroelsM is offline TroelsM  Denmark
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Quote:
Originally Posted by voltwide View Post
Your test indicates that magnetizing current was way too high, so the MOSFETs heated up according to conduction loss Rdson*Irmsē.
You should learn to measure primary current and simulate the primary tank with LTspice.
Hi. I think I have a decent knowledge of simulating this stuff, but I'm probably overlooking something, or maybe I have a "hidden" parasitic in the prototype that does not show up in the sims i have done.

The supprising part is that the sims dont show drastic changes from 75uH to 110uH. I donīt think I'll have the time to full analyze the difference right now, but hopefully I can get back to the issue later.

Kind regards TroelsM
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Old Yesterday, 10:24 AM   #54
kees52 is offline kees52  Netherlands
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I have use this core a E71\33\32.

But is for a welder inverter.

Have someone a good simulation schematic for LLC with models? I have the ncp1395 mod and osc only it is in zip with schematic.
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Old Today, 09:20 PM   #55
voltwide is online now voltwide  Ireland
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Quote:
Originally Posted by kees52 View Post
I have use this core a E71\33\32.

But is for a welder inverter.

Have someone a good simulation schematic for LLC with models? I have the ncp1395 mod and osc only it is in zip with schematic.

pls complete your zip archive, I got "could not find symbol VC02"
you may find this link useful: https://archive.eetasia.com/www.eeta...N_6f1e90c8.HTM
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