Transcription of Eddy Current Losses in Transformer Windings and Circuit …
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Eddy Current Losses in Transformer Windings and Circuit …
Eddy Current Losses in Transformer Windings and Circuit Wiring Lloyd H. Dixon, Jr. Introduction energy is stored in air gaps, insulation between As switching power supply operating fre- conductors, and within the conductors, where quencies increase, eddy Current Losses and relative permeability JLr is essentially and parasitic inductances can greatly impair Circuit constant. The energy density then becomes: performance. These high frequency effects are w = \BH = \'tJ.(j/I2 J/m3. caused by the magnetic field resulting from Current flow in Transformer Windings and Circuit where ILOis the absolute permeability of free space ( =47r .10"7 in units). Total energy W. wiring. This paper is intended to provide insight into (Joules) is obtained by integrating the energy these phenomena so that improved high fre- density over the entire volume, v, of the field: quency.)
4. Circuit inductance: Inductance is a meas-ure of an electrical circuit's ability to store magnetic energy. Equating the energy stored in the field from (3) with the same energy in circuit terms: W = \Lf = \ILO N2fA/e L = ILO N2A/e (4) Skin Effect Figure 1 shows the magnetic field (flux lines)
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