A new scheme of a gain/efficiency-improved serial- parallel switched-capacitor converter (SPSCC) is proposed by combining an adaptive-conversion-ratio (ACR) and pulse-width- modulation (PWM) control for step-up DC-DC conversion. For improving gain, the power part consists of one m c -stage cell and one n c -stage cell in cascade to obtain the step-up gain of (m c +1)×(n c +1) at most. For improving efficiency, the ACR control with adapting stage number m,n is presented to select a proper gain of (m+1)×(n+1) ( m=1,2,...,m c , n=1,2,...,n c ) according to the desired output. Further, the PWM control is adopted to enhance output regulation as well as robustness to source/loading variation. Some theoretical analysis and control design include: formulation, steady-state analysis, conversion ratio, efficiency, output ripple, stability, capacitance selection, and control design. Finally, the performance of this scheme is verified experimentally on a SPSCC prototype, and all results are illustrated to show the efficacy of this scheme.
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Chang et al. (2013) studied this question.
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