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Self-calibrating driver for charging a capacitive load to a desired voltage

  • US 8,035,401 B2
  • Filed: 06/26/2007
  • Issued: 10/11/2011
  • Est. Priority Date: 04/18/2007
  • Status: Active Grant
First Claim
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1. A device comprising:

  • a variable current source configured to generate a default source current for charging a capacitive load;

    a load charge calibrator configured to detect a voltage associated with the capacitive load when charged by the default source current, and configured to generate a current control feedback, wherein the current control feedback causes the variable current source to output a charge current capable of charging the capacitive load to a predetermined charged voltage of the capacitive load during a preset charging time, and wherein a level of the charge current is based on the detected voltage and the predetermined charged voltage, and wherein the preset charging time indicates a length of time that the variable current source is configured to deliver the charge current to the capacitive load; and

    a calibration controller configured to indicate the predetermined charged voltage of the capacitive load to the load charge calibrator for use in calibrating the variable current source to charge the capacitive load to the predetermined charged voltage.

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