Analysis and Modeling of High-Efficiency Multiphase Switched-Capacitor Converter with Variable-Phase Control

A modeling and analysis of a two-stage multiphase switched-capacitor (MPSC) converter is derived by combining a variable-phase control (VPC) and a pulse-width-modulation (PWM) technique for highefficiency step-up DC-DC conversion. In this MPSC, there are two voltage doublers in series for boosting the voltage gain up to 4 22 = at most. Here, VPC is suggested to realize a variable multiphase operation by changing phase number and topological path for more suitable level of voltage gain (4x/3x/2x/1x) so as to improve the power efficiency, especially for the lower output voltage. Further, some theoretical analysis and design include: MPSC modeling, steady-state analysis, power efficiency, conversion ratio, output ripple, capacitance selection, and stability. Finally, the MPSC is simulated, and all the results are illustrated to show the efficacy of the proposed scheme.