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Nonlinear transformer model for circuit simulation

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5 Author(s)
Chan, J.H. ; Hong Kong Univ., Kowloon, Hong Kong ; Vladimirescu, A. ; Gao, X.-C. ; Liebmann, P.
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A transformer model which consists of a nonlinear core with hysteresis and multiple windings is described as implemented in DSPICE. In contrast to previous implementations, the nonlinear behavior of the new model is described by continuous piecewise-hyperbolic functions characterized by three parameters. These parameters are the same as parameters previously published in the literature. A loop-traversing algorithm has been implemented which avoids discontinuities and eliminates both nonconvergence problems and the occurrence of erroneous voltage spikes during time-domain simulation. In the large-signal time-domain analysis the frequency-dependent eddy current losses in the core and wire losses are modeled. Additional effects, such as wire skin effect and temperature dependence, are also included. In the small-signal AC analysis the transformer is modeled as frequency-dependent lossy mutual inductors. For both analyses, the air gap and the elated fringe field effect are modeled by extending the magnetic path length of the core appropriately

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Computer-Aided Design of Integrated Circuits and Systems, IEEE Transactions on  (Volume:10 ,  Issue: 4 )