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Registered Member #9039
Joined: Wed Dec 26 2012, 03:31PM
Location: Epping, Victoria, Australia
Posts: 117
If it is any help to anyone out there, the core from a TV flyback transformer makes a great gate driver transformer.
I have just tested one with a 1:2:2 winding with an automotive light bulb connected to one of the :2 windings and a 12V supply to a 555 plus TC4422 and the light bulb lit up almost as bright as when I connected it directly to the 12V supply.
I platted the 3 wires together until I exhausted the length of the :1 wire and then I just twisted the remaining two :2 wires.
I made a former from a bit of overhead transparency sheet and used insulation tape to tape it up.
Then I wound my trifilar wire onto the former and then taped that over the winding to hold it in place.
Then you just slip the former onto the cylindrical bit of the flyback core.
Old TVs are fairly easier to come by these days with everyone upgrading to flat screens these days. They are often dumped in the new housing estates not far from our house.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
The simple answer is you get better coupling and less stray inductance, I think.
The stray inductance can resonate with any 'stray capacitance', and cause losses and ringing, etc.
Yours should be ok for most applications as it is, but for higher frequencies it would be better to spread the windings more evenly, at least, I think that's pretty much the case
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Suitable ferrite core for Gate Driver Transformer
