Two-stage current-mode multiphase voltage doubler based on PWM control

Abstract

A closed-loop switched-capacitor-based (SC) two-stage current-mode multiphase voltage doubler (MPVD) is proposed based on pulse-width-modulation (PWM) control to achieve low-power step-up DC-DC conversion. The SC-based converter needs no magnetic element, e.g. inductor and transformer, so I.C. fabrication will be promising for VLSI applications. This current-mode MPVD can obtain the high voltage gain just by using the least number of pumping capacitors, so it will save the fabrication areas more. Besides, by combining with a current source and PWM control, a closed-loop MPVD is realized not only to enhance regulation capability for different desired outputs, but also to reinforce output robustness against source noises. Here, some theoretical analysis includes state-space averaging model, steady-state/transient analysis, power efficiency, and system stability. Finally, the closed-loop current-mode MPVD is simulated by OrCAD, and the results are illustrated to show the efficacy of the proposed scheme.