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High-efficiency, switched-capacitor power conversion using a resonant clocking circuit to produce gate drive signals for switching capacitors

  • US 8,320,141 B2
  • Filed: 08/05/2009
  • Issued: 11/27/2012
  • Est. Priority Date: 08/05/2009
  • Status: Active Grant
First Claim
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1. A system for converting between an input voltage and an output voltage, comprising:

  • an input coupled to the input voltage;

    an output coupled to the output voltage;

    a first and a second capacitor, each with a higher potential terminal and a lower potential terminal;

    a first set of switching devices which selectively couple the higher potential and lower potential terminals of the first capacitor between the input voltage, the output voltage and a base voltage;

    a second set of switching devices; and

    a resonant clocking circuit which generates clock signals with substantially non-overlapping clock phases, including a first phase and a second phase, for the first set of switching devices;

    wherein the resonant clocking circuit is configured to control the first set of switching devices so that during the first phase the higher potential terminal of the first capacitor is coupled to the input voltage and the lower potential terminal of the first capacitor is coupled to the base voltage, and during the second phase the higher potential terminal of the first capacitor is coupled to the output voltage and the lower potential terminal of the first capacitor is coupled to the input voltage,wherein the resonant clocking circuit is configured to control the second set of switching devices so that during the first phase the higher potential terminal of the second capacitor is coupled to the output voltage and the lower potential terminal of the second capacitor is coupled to the input voltage, and during the second phase the higher potential terminal of the second capacitor is coupled to the input voltage and the lower potential terminal of the second capacitor is coupled to the base voltage.

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