Self-calibrating driver for charging a capacitive load to a desired voltage
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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Abstract
A self-calibration system includes a variable current source to generate a default source current for charging a capacitive load, and a load charge calibrator to detect a voltage associated with the capacitive load when charged by the default source current, and to generate a current control feedback according to the detected voltage and a desired charged voltage of the capacitive load, the current control feedback to indicate to the variable current source a charge current capable of charging the capacitive load to the desired charged voltage.
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Citations
20 Claims
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1. A device comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method comprising:
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generating a default source current for charging a capacitive load, wherein a variable current source generates the default source current; indicating a predetermined charged voltage of the capacitive load for calibrating the variable current source to charge the capacitive load to the predetermined charged voltage; charging the capacitive load with the default source current for a length of time indicated by a preset charging time; detecting a voltage associated with the charged capacitive load; and generating a current control feedback according to the detected voltage and the predetermined charged voltage of the capacitive load, wherein the current control feedback causes the variable current source to output a charge current capable of charging the capacitive load to the predetermined charged voltage during the preset charging time, wherein a level of the charge current is based on the detected voltage and the desired charged voltage. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A system comprising:
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means for generating a default source current for charging a capacitive load; means for charging the capacitive load with the default source current means for detecting a voltage associated with the charged capacitive load; means for generating a current control feedback, wherein the current control feedback causes the means for generating current to output a charge current capable of charging the capacitive load to a predetermined charged voltage of the capacitive load for a length of time indicated by a preset charging time, and wherein a level of the charge current is based on the detected voltage and the desired charged voltage; and means for indicating the predetermined charged voltage of the capacitive load to the means for generating current for use in generating the current control feedback. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification