Method and apparatus for digital control of a lighting device
First Claim
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1. A method of digital control of a lighting device using a proportional-integral-derivative (PID) controller, the method comprising:
- a) obtaining a desired lighting device operational set point;
b) determining a present lighting device operational point;
c) determining a relationship based at least in part on the desired lighting device operational set point, the present lighting device operational point or both and comparing the relationship to a predetermined threshold;
d) assigning a first set of values as PID controller parameters when the relationship is above the predetermined threshold;
e) assigning a second set of values as PID controller parameters when the relationship is below the predetermined threshold; and
f) controlling the lighting device using the PID controller with the assigned PID controller parameters.
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Abstract
The present invention provides a method and apparatus for digitally controlling a lighting device which enables a desired lighting device operational set point to be reached in a rapid manner while substantially reducing overshoot and oscillation about the desired lighting device operational set point. In particular the present invention is enabled by a PID controller configured to vary the PID controller parameters based on a relationship based at least in part on the desired lighting device operational set point, the present lighting device operational point or both.
62 Citations
16 Claims
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1. A method of digital control of a lighting device using a proportional-integral-derivative (PID) controller, the method comprising:
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a) obtaining a desired lighting device operational set point; b) determining a present lighting device operational point; c) determining a relationship based at least in part on the desired lighting device operational set point, the present lighting device operational point or both and comparing the relationship to a predetermined threshold; d) assigning a first set of values as PID controller parameters when the relationship is above the predetermined threshold; e) assigning a second set of values as PID controller parameters when the relationship is below the predetermined threshold; and f) controlling the lighting device using the PID controller with the assigned PID controller parameters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An apparatus for digital control of a lighting device, the lighting device responsive to one or more control signals, the apparatus comprising:
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a) a feedback system configured to monitor one or more operational characteristics of the lighting device; and b) a proportional-integral-derivative (PID) controller operatively coupled to the lighting device and the feedback system, the PID controller configured to receive one or more feedback signals from the feedback system, the one or more signals indicative of the one or more operational characteristics of the lighting device, the PID controller configured to receive a first signal indicative of a desired lighting device operational set point and determine PID controller parameters based on a predetermined relationship based at least in part on the desired lighting device operational set point, a present lighting device operational point based on the one or more feedback signals or both, the PID controller configured to generate the one or more control signals based on the PID controller parameters;
thereby providing digital control of the lighting device. - View Dependent Claims (15, 16)
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Specification