Review of Topologies, Application Areas, Modeling, and Control Methods for Switched Capacitor Circuits

Switched capacitor (SC) circuits have been widely used for low-power and high-power areas, such as the integration circuit power supply, energy conversion for wearable devices, and power supply for data centers and electrical vehicles. The dc–dc conversion, dc–ac inversion, ac–dc rectification, and ac–ac conversion of SC topologies have been explored and discussed. This article provides a review of different topologies, application areas, mathematical models, and control methods for SC circuits. Compared with other review papers on SC converters, this article deeply and comprehensively surveys the topological structure classification and the equivalent circuits. It explores the application fields and the operation performance of SC circuits. The modeling method is presented as the steady-state modeling method and the transient modeling method. It will help to achieve accurate simulation and prediction and lay the foundation for theory analysis. The different mathematical models’ construction algorithms and the suitable application range are analyzed in this article. The control methods determine the quality of the output voltage and the output power for SC circuits. They are classified as the linear control methods and the nonlinear control methods. The nonlinear control methods will help to achieve high-quality output voltage or current regulation with low ripples and fast dynamical response speed. The comparison of different topologies, application areas, modeling methods, and control methods is provided and discussed. What is more, the simulation accuracy of different modeling strategies and static and dynamical regulation performance of different control algorithms are presented in this article, respectively. The challenges and opportunities for SC circuits are prospected.