Conversion Function Theory of DC–DC Switching Power Converters

A new time domain modeling method for dc–dc switching power converters is introduced: conversion function theory of dc converters. This method is based on the concept of “wanted variables” at the input and output terminals of the converter, while ignoring the secondary “unwanted” effects, such as harmonics and ripples produced by the converter. The modeling method applies to every kind of dc–dc converter. Further, the modeling is applicable for both static and dynamic operations. This conversion function theory is useful for computer modeling of converters and power systems containing many dc–dc converters. The modeling algorithm significantly speeds up computer simulation of converter intensive power systems, such as micorgrids and electric vehicles. It also facilitates converter and system control design and their intuitive understanding. For example, input and output side system components can be referred to the opposite side of the converter, thus, suppressing the complexities of switched topology circuit simulation.