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Registered Member #4992
Joined: Wed May 23 2012, 03:57PM
Location:
Posts: 108
What could cause my low side mosfet to get hot if my signal is perfect and in phase? I've tried adjusting the timing but it just does not make any difference.
Registered Member #230
Joined: Tue Feb 21 2006, 08:01PM
Location: Gracefield lower Hutt
Posts: 284
Furnace I do not like d5 d6 in your schematic this is taking 5.1 volts off your gate drive . Also there is no load on the gates so the gate capacitance will make the gate slow to switch off =heat. Check other circuit sources especially data sheets for your driver ic's for the correct gate drive circuitry
Registered Member #4992
Joined: Wed May 23 2012, 03:57PM
Location:
Posts: 108
I did try and remove d5 and d6, but it makes no difference, they actually work good because it gives me timing delay. I don't understand what you mean by not having load on the gate? Do I need to add something extra on the gates?
Registered Member #230
Joined: Tue Feb 21 2006, 08:01PM
Location: Gracefield lower Hutt
Posts: 284
Furnace I would expect 10K or lower to local earth (ie source) from gate to stop it floating around due to dVdt and the internal capacitance of the switching device
Registered Member #4992
Joined: Wed May 23 2012, 03:57PM
Location:
Posts: 108
Connected a 5k, now switches heat up more evenly. Are my switches suppose to heat up? Or could this also be a sign that my ferrite core is saturated? I have a large u core OP49925UC. When I go past currie point my switches heat up aggressively and blow up. Should I move to larger switches or could it be my core and is there a way to test for core saturation?
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Heating on half bridge
