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Mutual Inductance and Basic Operation
Suppose we were to wrap a coil of insulated wire around a loop of ferromagnetic material and energize this coil with an AC voltage source: (Figure below (a)) Insulated winding on ferromagnetic loop...
View ArticleStep-Up and Step-Down Transformers
So far, we've observed simulations of transformers where the primary and secondary windings were of identical inductance, giving approximately equal voltage and current levels in both circuits....
View ArticleElectrical Isolation
Aside from the ability to easily convert between different levels of voltage and current in AC and DC circuits, transformers also provide an extremely useful feature called isolation, which is the...
View ArticlePhasing
Since transformers are essentially AC devices, we need to be aware of the phase relationships between the primary and secondary circuits. Using our SPICE example from before, we can plot the waveshapes...
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Winding Configurations
Transformers are very versatile devices. The basic concept of energy transfer between mutual inductors is useful enough between a single primary and single secondary coil, but transformers don't have...
View ArticleVoltage Regulation
As we saw in a few SPICE analyses earlier in this chapter, the output voltage of a transformer varies some with varying load resistances, even with a constant voltage input. The degree of variance is...
View ArticleSpecial Transformers and Applications
Impedance matching Because transformers can step voltage and current to different levels, and because power is transferred equivalently between primary and secondary windings, they can be used to...
View ArticlePractical Considerations
Power capacity As has already been observed, transformers must be well designed in order to achieve acceptable power coupling, tight voltage regulation, and low exciting current distortion. Also,...
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