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An auto-reconfigurable 2×/3×switched-capacitor charge pump (SC-CP) for transcutaneous power transmission is presented in this paper. The proposed SC-CP can automatically configure its own voltage conversion ratio according to different input voltages by using the adaptive control circuitry such that the DC/DC regulator can maintain high power efficiencies under coupling variations. In addition, a dynamic dead-time control scheme and a minimum capacitance selection strategy are developed to improve the power efficiency of the proposed SC-CP through minimizing the shoot-through current and maximizing its average output voltage, respectively.
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Zhang et al. (2010) studied this question.
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