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High power switched capacitor voltage conversion and regulation apparatus

  • US 5,581,454 A
  • Filed: 11/22/1994
  • Issued: 12/03/1996
  • Est. Priority Date: 11/22/1994
  • Status: Expired due to Fees
First Claim
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1. An integrated step-up/step-down DC-to-DC converter comprising:

  • a voltage input terminal;

    a step-up voltage converter including (a) a first capacitor array including a plurality of capacitor elements, and (b) first switching means for operating in a first mode to connect said first capacitor array to said voltage input terminal and to connect each of said plurality of capacitor elements of said first capacitor array in parallel with each other within said first capacitor array, and in a second mode to connect said first capacitor array to an output of said step-up voltage converter and to connect each of said plurality of capacitor elements of said first capacitor array in series with each other within said first capacitor array;

    a step-down voltage converter including (a) a second capacitor array including a plurality of capacitor elements, and (b) second switching means for operating in a third mode to connect said first capacitor array to said output of said step-up voltage converter and to connect each of said plurality of capacitor elements of said second capacitor array in series with each other within said second capacitor array, and in a fourth mode to connect said second capacitor array to an output of said step-down voltage converter and to connect each of said plurality of capacitor elements of said second capacitor array in parallel with each other within said second capacitor array;

    a voltage output terminal coupled to said output of said step-down converter.

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