A Sigma Converter for High-Voltage Bus Converter: Modeling and Control

Abstract

In this article, a sigma converter for high-voltage bus converter is proposed. The sigma converter of input-series output-parallel consists of a LCLCL-DCX (DC Transformer) and a dual-transistor forward converter (DTFC). LCLCL-DCX transfers most of the energy, and it can deliver power with the fundamental component and the third harmonics, which makes it have a high efficiency. In this article, in order to further analyze the behavior of the converter and design control scheme, the small-signal model of proposed sigma converter is derived. And a voltage-mode control design is provided.