Salvador12
Full Member level 4
Hey , so I finally finished my smps which is a half bridge driving two IGBT's , all seems well , the IGBT's are barely warm etc but the transformer is getting hot even under longer periods of light loads.
The wires are not how they are simply warm and even could be that way because the core is giving off heat , the part that gets hot is the ferrite core , I wonder what causes this ?
the frequency is +-50kHz and the primary turns ratio is 11 turns. the wire is rather thick , haven't measured precisely but I think could be some 3 mm2.
the core is EPCOS ETD59, the material of ferrite is N87, with permeability of 5300nH.It has no airgap in the center pole.
the thing is everything seems to work, i'm getting my needed output voltages , also there isn't a lack of power , the IGBT's run only warm even with much higher loads as I have tried , up to 1.5kW.
the transformer core i causing me problems, what could it be ?
I suspect either too few or too many primary turns, maybe too many ?
The wires are not how they are simply warm and even could be that way because the core is giving off heat , the part that gets hot is the ferrite core , I wonder what causes this ?
the frequency is +-50kHz and the primary turns ratio is 11 turns. the wire is rather thick , haven't measured precisely but I think could be some 3 mm2.
the core is EPCOS ETD59, the material of ferrite is N87, with permeability of 5300nH.It has no airgap in the center pole.
the thing is everything seems to work, i'm getting my needed output voltages , also there isn't a lack of power , the IGBT's run only warm even with much higher loads as I have tried , up to 1.5kW.
the transformer core i causing me problems, what could it be ?
I suspect either too few or too many primary turns, maybe too many ?