A gain/efficiency-enhanced bidirectional switched-capacitor DC-DC converter

A closed-loop gain/efficiency-enhanced bidirectional switched-capacitor converter BSCC is proposed by combining an adaptive-conversion-ratio ACR phase generator and pulse-width-modulation PWM controller for bidirectional step-up/down DC-DC conversion and regulation. For realizing gain-enhanced, the power part consists of one mc-stage cell and one nc-stage cell in cascade between low-voltage LV and high-voltage HV sides to boost HV voltage into mc×nc times voltage of LV source at most, or convert LV voltage into 1/mc×nc times voltage of HV source at most. For realizing efficiency-enhanced, the ACR idea with adapting stage number m,n is built in the phase generator to obtain a suitable step-up/down gain: m×n or 1/m×nm=1,2,',mc, n=1,2,',nc. Further, the output regulation and robustness to source/loading variation can be enhanced by PWM on the LV/HV sides. Some theoretical analysis and control design are included as: modeling, steady-state analysis, conversion ratio, efficiency, capacitance selection, and control design. Finally, the performance of this scheme is verified experimentally on a BSCC prototype, and all results are illustrated to show the efficacy of this scheme. Copyright © 2012 John Wiley & Sons, Ltd.

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