A New Approach to Improve the Voltage Conversion Ratio in Topological Switched-Capacitor DC–DC Converters Using Negator Stage

Abstract

This paper provides a simple yet novel structure to achieve voltage conversion ratio (VCR) that exceeds the theoretical attainable VCR of topological switched-capacitor DC-DC converters (SCC). Typically, the SCC terminals are connected to the input voltage, the output voltage, or the ground reference. The proposed structure in this paper utilizes the ground-connected terminals and instead connecting them to negative input voltage provided by a negator stage. Here, two types of SCC are used as case studies: Series-parallel (SPSC) and Fibonacci (FSC). The model for the proposed structure is constructed and verified experimentally using 3-stage SPSC and FSC. The experimental results are in good agreement with the proposed model with an error of less than 5% in all cases. The VCR obtained from the proposed structure exceeds the theoretical limits of conventional topological structures.Index Terms-Switched-capacitor converter (SCC), high-gain DC-DC converters, series-parallel (SPSC), Fibonacci switchedcapacitor converters (FSC), and voltage conversion ratio (VCR).

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