Method circuitry and electronic device for controlling a variable output dc power source
First Claim
1. A method comprising:
- determining a first plurality of output current levels over a first range of output voltage levels for a variable output DC power source, each one of said first plurality of output current levels equal to a maximum output power level of said variable output DC power source divided by an output voltage level of said variable output DC power source over said first range;
establishing a second plurality of output current levels over said first range of output voltage levels in response to said first plurality of output current levels, said second plurality of output current levels decreasing with increasing voltage levels over said first range;
monitoring an output current of said variable output DC power source; and
driving said output current towards one of said second plurality of output current levels if an output voltage of said variable output DC power source is within said first range and if said output current at said output voltage is greater than or equal to said one of said second plurality of output current levels associated with said output voltage.
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Accused Products
Abstract
Power control circuitry and method for controlling a variable output DC power source. The power control circuitry may comprise a first comparator to compare a signal representative of an output current level of the variable output DC power source with a threshold level and provide a first output signal in response to the comparison. The power control circuitry may further comprise threshold input circuitry to provide the threshold level to the first comparator, the threshold level being a fixed threshold level if an output voltage of the variable output DC power source is less than or equal to a first fixed voltage level, the threshold level being a variable threshold level if the output voltage is greater than the first fixed voltage level.
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Citations
19 Claims
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1. A method comprising:
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determining a first plurality of output current levels over a first range of output voltage levels for a variable output DC power source, each one of said first plurality of output current levels equal to a maximum output power level of said variable output DC power source divided by an output voltage level of said variable output DC power source over said first range; establishing a second plurality of output current levels over said first range of output voltage levels in response to said first plurality of output current levels, said second plurality of output current levels decreasing with increasing voltage levels over said first range; monitoring an output current of said variable output DC power source; and driving said output current towards one of said second plurality of output current levels if an output voltage of said variable output DC power source is within said first range and if said output current at said output voltage is greater than or equal to said one of said second plurality of output current levels associated with said output voltage. - View Dependent Claims (2, 3, 4, 5)
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6. Power control circuitry for controlling a variable output DC power source, said power control circuitry comprising:
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a first comparator to compare a signal representative of an output current level of said variable output DC power source with a threshold level and provide a first output signal in response to said comparison; threshold input circuitry to provide said threshold level to said first comparator, said threshold level being a fixed threshold level over an initial range of output voltage values where an output voltage of said variable output DC power source is less than or equal to a first fixed voltage level, said threshold level being a variable threshold level over a first range of output voltage values where said output voltage is greater than said first fixed voltage level; and power limiting control circuitry to provide a control signal to said variable output DC power source in response to said first output signal from said first comparator. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. An electronic system comprising:
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a variable output DC power source to provide power to a load; and power control circuitry to provide a control signal to said variable output DC power source, said variable output DC power source responsive to said control signal to adjust an output power level of said DC power source, said power control circuitry comprising; a first comparator to compare a signal representative of an output current level of said variable output DC power source with a threshold level and provide a first output signal in response to said comparison; threshold input circuitry to provide said threshold level to said first comparator, said threshold level being a fixed threshold level if an output voltage of said variable output DC power source is less than or equal to a first fixed voltage level, said threshold level being a variable threshold level if said output voltage is greater than said first fixed voltage level; and power limiting control circuitry to provide a control signal to said variable output DC power source in response to said first output signal from said first comparator. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification