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Circuit and method for regulating discharge of a capacitor

  • US 8,525,487 B1
  • Filed: 02/26/2009
  • Issued: 09/03/2013
  • Est. Priority Date: 03/05/2008
  • Status: Active Grant
First Claim
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1. A circuit comprising:

  • a first capacitor having a terminal for connection to a power source that is external to the circuit, wherein the first capacitor stores a charge from the power source when the terminal of first capacitor is connected to the power source;

    a second capacitor having a terminal for connection to an electronic device to provide power to the electronic device;

    a plurality of switched capacitors configured to transfer a charge stored by the first capacitor to the second capacitor, wherein the charge transferred to the second capacitor from the first capacitor serves as the power provided to the electronic device via the terminal of the second capacitor; and

    a control circuit configured to control switching of the plurality of switched capacitors based on a voltage of the second capacitor,wherein the plurality of switched capacitors are switched at a frequency that is inversely proportional to a voltage of the first capacitor.

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