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Registered Member #2727
Joined: Tue Mar 09 2010, 02:39PM
Location: Montevideo - Uruguay
Posts: 33
Hi people. I want to make a Mazilli ZVS driver for an old AC fly-back and was thinking about the way I can do the primary winding. As there are few turns in the primary, the possibility of making a bifilar winding is attractive as it´s easy and can be better for the transformer. Have someone experience with this very little modification ?? Have advantages or it´s disadvantageous ?
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
Does your winding have precisely the same length of wire in the two halves of the primary? And the spacing of the winding is it the same throughout?
It would be nice to see a photo of the finished primary. Is the intent to reduce 2nd harmonics because of difference in magnetization of the core in the positive and negative excursions?
Registered Member #2727
Joined: Tue Mar 09 2010, 02:39PM
Location: Montevideo - Uruguay
Posts: 33
The finality of this attempt is to have a more extended copper distribution over the leg of both half-windings, and as a secondary consequence, a better coupling between the two pieces of primary. My question arises because I don't know if the better coupling is convenient or not for the Mazilli driver. Thanx again
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
McLyman (Transformer and inductor design handbook) advises bifilar winding increases capacitance and indicates that the wires should be wide spaced to reduce. However in steps to reduce capacitance, bifilar winding is not advised. Why? because ringing occurs (overshoot) as leakage inductance resonanes wiith lumped capacity. (transformers designed for square wave operation) pp. 202-203
Registered Member #2727
Joined: Tue Mar 09 2010, 02:39PM
Location: Montevideo - Uruguay
Posts: 33
Very nice ! Did you notice any ringing problem as the pointed by radiotech ? I think that this kind of ZVS oscillator generates sinusoidal wave forms, Isn't it?
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Hi guys,
There is no actual need to use center-tapped winding in a mazilli circuit. It just makes it convenient to use a single inductor - in case another one is difficult to obtain. In nearly all my incarnations of the circuit, I didn't use a center tapped ''push pull winding''. Instead I used a single winding, and two inductors, each connected from supply voltage to drains of each mosfet.
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Bifilar PushPull in a Mazilli ZVS winding ?
