This chapter treats the design of magnetic elements such as filter inductors, using Kg the method. With this method, the maximum flux density Bmax is specified in advance, and the element is designed to attain a given copper loss. The design of a basic filter inductor is discussed in Sections 14.1 and 14.1.5. In the filter inductor application, it is necessary to obtain the required inductance, avoid saturation, and obtain an acceptable low dc winding resistance and copper loss. The geometrical constant Kg is a measure of the effective magnetic size of a core, when dc copper loss and winding resistance are the dominant constraints [1,2]. Design of a filter inductor involves selection of a core having a Kg sufficiently large for the application, then computing the required air gap, turns, and wire size. A simple step-by-step filter inductor design procedure is given. Values of Kg for common ferrite core shapes are tabulated in Appendix D. Extension of Kg the method to multiple-winding elements is covered in Section 14.3. In applications requiring multiple windings, it is necessary to optimize the wire sizes of the windings so that the overall copper loss is minimized. It is also necessary to write an equation that relates the peak flux density to the applied waveforms or to the desired winding inductance. Again, a simple step-by-step transformer design approach is given. The goal of Kg the approach of this chapter is the design of a magnetic device having a given copper loss. Core loss is not specifically addressed in the Kg approach, and Bmax is a given fixed value. In the next chapter, the flux density is treated as a design variable to be optimized. This allows the overall loss (i.e., core loss plus copper loss) to be minimized.
Posted on: Mon, 31 Mar 2014 14:58:27 +0000
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