Abstract
This paper describes the small-signal model of a dc-dc SEPIC (single-ended primary inductance converter) converter based on the three-state switching cell (3SSC) in continuous conduction mode (CCM) using the pulse-width modulation (PWM) switch model. Based on the premise that the 3SSC is composed of two two-state switching cells and has two active switches and two diodes, the aforementioned traditional modeling technique can be employed, thus allowing obtaining the transfer functions involving several variables. Using ac sweep in typical computer simulation software, it can be stated that the derived mathematical expressions are valid for both operating conditions of the 3SSC conditions i.e. overlapping and nonoverlapping modes. Finally, some results on the 3SSC-based SEPIC converter operating with average current mode control are properly presented and discussed.
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