A Novel Switched Capacitor DC-DC Converter Topology for High Voltage and High Gain Application

Abstract

Switched Capacitor Converter(SCC) is gaining increased popularity in AC and DC applications due to its advantages such as high energy density, high efficiency, compactness, and minimal cost. However, their application in high gain and high voltage applications is of significant interest as the device ratings and the converter cost increase proportionally. Several topologies of SCC’s are considered in literature like the Fibonacci, Ladder, Multilevel, etc., wherein they possess a common problem of higher device rating or lower efficiency in high gain and high voltage application. This paper proposes a novel SCC topology for high voltage and high gain applications where the device ratings are optimized to minimize the cost and size of the converter. In the proposed topology, all the capacitors and almost half the switches and diodes are rated for input voltage. A general formula to obtain device ratings of the converter is also derived in the paper. A state space average model is utilised to find the steady state output voltage and efficiency. Also, a generalized average loss model is formed based on the average current-based conduction loss model to determine load regulation of the proposed converter. The analysis of the converter is performed and validated through simulations. This paper deals only with the steady state analysis and loss model of the proposed SCC.