网络变压器设计及工艺.doc

LAN Magnetics Design Introduction:The following presentation is a tutorial in the field of ferrite toroid designfocusing on the area of Local Area Networks (LAN). The formulas in thechapters are either standard magnetic pulse transformer design derivations,or personally derived estimating formulas for calculating the parasitic parameter values.There has been a attempt to create these formulas fromthe placement of wire on the toroidal core. This is not perceived as a perfectdepiction of the parameters, but as an estimate based upon the wire beingplaced upon the core evenly without the presence of winding errors such asgaps or wire crossovers. The results of these human winding variations would increase the calculated values. However, this paper presents a fairlyaccurate picture of the functional performance based upon the data inputs.These created formulas should be considered as a first cut at the design totry to save time. The final outcome is achieved when the finished coil designsare functionally tested and the design is fine tuned to meet the IEEE specific-ations. Copyright 2006 - Dallas DeanBiography:Dallas Dean has over forty years of experience working in the field of magnetic pulse transformer design. Designs include shift registers, counters,pulse transformers,filters, Token Ring and LAN magnetics to suppress EMI noise. As the electrical member of one design team, he holds two patents in shielded connector design. Dean holds a B.S. degree in electro- mechanical engineering from Lowell Technological Institute (Lowell University). He can be contacted via email at dallasdean@. Book Outline Chapter 1 - Design FlowchartChapter 2 - Specifications RequirementsChapter 3 - Core selectionChapter 4 - Transformer DesignChapter 5 - Leakage InductanceChapter 6 - Coupling CapacitanceChapter 7 - Distributed CapacitanceChapter 8 - Winding DC ResistanceChapter 9 - Waveform AnalysisChapter 10 - Parasitic parameter optimizationCh