PSPICE modeling of Buck Converter by means of GTFs

摘要

The paper describes a way how to model the DC-DC buck converter by means of the so-called generalized transfer functions, utilizing both the Laplace and the z-transfbrm operators. The resulting line-to-output and control- to-output transfer functions and the corresponding frequency responses can model some system behavior more truly than the classical s-domain averaged models, including special effects above the Nyquist's frequency. As an example, a concrete SPICE subcircuit is shown together with the results of AC analysis.