A method for modelling switching-converter power stages is developed, whose starting point is the unified state-space representation of the switched networks and whose end result is either a complete state-space description or its equivalent small-signal low<-f requency linear circuit model.A new canonical circuit model is proposed, whose fixed topology contains all the essential inputr-output and control properties of any dc-todc switching converter, regardless of its detailed configuration, and by which different converters can be characterized in the form of a table con veniently stored in a computer data bank to pro vide a useful tool for computer aided design and optimization. The new canonical circuit model predicts that, in general;switching action intro duces both zeros and poles into the duty ratio to output transfer function in addition to those from the effective filter network.

A method for modelling switching-converter power stages is developed, whose starting point is the unified state-space representation of the switched networks and whose end result is either a complete state-space description or its equivalent small-signal low<-f requency linear circuit model. A new canonical circuit model is proposed, whose fixed topology contains all the essential inputr-output and control properties of any dc-todc switching converter, regardless of its detailed configuration, and by which different converters can be characterized in the form of a table con veniently stored in a computer data bank to pro vide a useful tool for computer aided design and optimization. The new canonical circuit model predicts that, in general;switching action intro duces both zeros and poles into the duty ratio to output transfer function in addition to those from the effective filter network.

Abstruct-A unified model is established for a currentprogrammed converter, which is both a modification and an extension of familiar models. Inclusion of the sampling effect allows the presence of an additional pole up in the current-loop gain to be derived. The resulting final double-slope asymptote is fixed in position, and the crossover frequency cannot exceed half the switching frequency. A stability parameter, Q 3 , determines the additional pole and describes the degree of peaking in the closed-loop transfer function. Experimental verification employs an analog signal injection technique.

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