I am about to start winding the bobin for my smps transformer. The transformer is an ETD49 (I had one already), that will have double primary center-tapped windings of 3 turns, 8 wire 0.7mm litzed each. My problem is that I want each of the primaries to go from one side of the bobin to the other, but with this wire I will only cover half of the length with each primary, what do you recommend me to do? Should I wind both primaries in series and take the tap in the middle and route it out to the edge of the bobin?
Additionally, there will be a double, centre tapped secondary side with 2x15, double litz-wired 0.7mm. This wont fill an integer layer either (you can squeeze ~45 turns on each layer), how is this best spread over the bobin?
Additionally, there will be a double, centre tapped secondary side with 2x15, double litz-wired 0.7mm. This wont fill an integer layer either (you can squeeze ~45 turns on each layer), how is this best spread over the bobin?
zilog said:
How about not twisting wire bundle but keep it flat? And interleave both primaries in same layer(though it may be super-difficult to wind 16 wires parallei flat)
This would result 33 millimeter winding widht, does it fit on your bobbin?
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And 7 wires twisted together would result more neat bundle than 8
For optimum results i would recommend copper foil for primary.
I think Im pushing the limits already, what current density can be tolerated in primary windings in a push-pull 12V var amplifier topology? the plan is to power a pair of class D half-brigde amplifiers that will be able to use full rail voltage of +-45V into a load of 4 and ultimately 2 ohm at 60-65% modulation. I know that peak-to-average ratio for music is quite high, but is there any rule of thumb regarding the design? The amplifiers will probably be powering woofers.
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