---+++ Papers that discuss the reduction of winding capacitance on a wound magnetic component

University power electronic education through and industrial battery charger design project--a case study http://www.manchesteruniversitypress.co.uk/uploads/docs/360001.pdf Summary of this paper

a) spacing the layers further apart from each other and b) using an appropriate winding layer connection so as to ensure that the turns with the greatest potential difference do not overlap each other.

So placing an insulation gap in between winding layers is a good idea And winding left-right for the first layer, then left-right for the second layer reduces the overall potential difference between the layers reducing the capacitance (so with a torroid you want to keep winding in the same direction)

They mention that the insulation layer can be difficult space wise, so using another winding (such as the primary) as the insulation layer can be a good idea. They also say that that sandwiching the secondary in between two primary layers, the leakage inductance can be reduced. For us we'd be more interested in sandwiching the primary between secondary windings.

What about using really thin superconducting wire with really thick insulation around it?

Using grounded foil in between layers? since this would reduce the potential http://www.cdiweb.com/powerint/di27.pdf (see page 2 "Wind transformer with tape between primary layers to further reduce intra-winding capacitance")

http://focus.ti.com/lit/ml/slup125/slup125.pdf

This article from TI mentions something called Bank winding. This winding technique minimizes the voltage between windings, thus minimizing the overall capacitance.

* BankWinding.jpg:

This article seems very interesting - on wide band transformers and modelling http://www.arrl.org/qex/2005/qx3Trask.pdf

-- WinterlandUser - 08 Mar 2010

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This topic: ColdFeedback > WebHome > WindingCapacitancePapers Topic revision: r1 - 2010-03-08 - WinterlandUser

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