Analysis of a step-up dc/dc converter with capability of right-half plane zero cancellation

Abstract

The classical boost converter for dc/dc voltage conversion in photovoltaic or fuel cell sources inherits the disadvantage of having a slow dynamical behavior, because of the existence of the right-half plan zero (RHPZ) in its input-to-output transfer function. It is the major challengeable concern in the design of the boost converters needing to work in a continuous-conduction mode. To cancel the right-half plan zero from the transfer function of the classical converters, this paper proposes and analyses a new boost converter with a high voltage gain and minimum phase structure. This converter has a fast dynamic response compared with the conventional boost converter and therefore, it is more suitable for applications with fast dynamic response action to connect an input voltage source to an output load. In order to derive the state-space model of the suggested converter, its steady state performance is studied in details and the essential equations are obtained. The formula of the transfer function is deduced by using the averaging technique and then, the theoretical explanations and assessments are presented to show the main characteristics and superiority of the proposed converter. In addition, a practical hardware system of the designed converter has been built and tested.