Generalized small signal modeling of coupled inductor based high gain, high efficiency dc-dc converters

Abstract

The high voltage gain, high efficiency dc-dc converters are essential for low voltage fed renewable energy applications. Usually, a high gain dc-dc converter consists of many passive components, which increases the order of the system. As order of the converter increases, its modelling and control becomes highly complex. Thus, there is a need for simplification of the small signal modelling of such converters. This paper presents a generalized small signal model and equivalent circuit for coupled inductor based high voltage gain converter systems that can be conveniently used for their control design. Analysis is included and is verified using simulations and experiments for the output voltage regulation of high voltage gain converters. The usefulness and versatility of the proposed model is verified with example high gain converter systems belonging to this class. All the results of this work are included.