Chapter 9

Transformers

Abstract

A transformer is implemented by magnetically coupling two or more coils (inductors) together. For air core transformers, a K_Linear coupling device from the analog library is used, whereas for nonlinear transformers, a magnetic core model is referenced by the K coupling device. When creating a linear transformer, the coils are specified in units of henry (H), whereas for nonlinear transformers, users specify the number of turns for the inductors. The PSpice magnetic cores model hysteresis effects and include a coupling coefficient, which is used to define the proportion of flux linkage between the coils. A step-down linear transformer is presented using inductors for the primary and secondary windings which ...

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