Abstract
A Single-Ended Primary Inductor Converter is a DC-DC converter, capable of operating both in step-up or step-down mode and is widely used in battery-operated applications. There are two possible modes of operation in the SEPIC converter one is the Continuous Conduction Mode and another one is the Discontinuous Conduction Mode. This paper presents modeling of a SEPIC converter operating in Continuous conduction mode(CCM) using the State-Space Averaging technique. The SEPIC converter consists of two inductors and two capacitors so it is a fourth order dc dc converter. Design of a feedback compensator for the fourth order system is quite complex. In this paper, the controller is designed for reduced order model of SEPIC converter by using model order reduction (MOR) technique. First small signal model of SEPIC converter) is obtained by using state space analysis (SSA) which provides fourth order transfer function. Then the Pade approximation technique is used to reduce the fourth order transfer function to second order transfer function. Then the controller is designed for the reduced order model of the SEPIC converter.
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