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Article: Model a nonideal transformer in Spice.(Technology Information)
- Article from:
- EDN
- Article date:
- June 5, 2000
- Author:
CopyrightCOPYRIGHT 2000 Reed Business Information, Inc. (US). This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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DESIGNERS OFTEN USE transformers as voltage, current, and impedance adapters. Transformers usually comprise two inductively coupled coils, wound around a ferrite core. The coupling between the windings is never perfect. Spice provides a model (Figure 1a) of the coupled inductors using the k parameter, which is the coefficient of coupling between the windings. The model takes into account self and mutual inductances. With nonideal transformers, the problem is to determine k. Figure 1b shows a proposed equivalent circuit of a nonideal transformer, in which the conduction losses in the windings and the core losses are assumed to be negligible. [L.sub.S] is the equivalent ...
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