System and method for reducing flicker of compact gas discharge lamps at low lamp light output level
First Claim
1. A method for assembling a light fixture for stably dimming a lamp light output level of a gas discharge lamp to a low lamp light output level without observable flicker, said method comprising:
- assembling into a light fixture a ballast and a gas discharge lamp;
assembling into the ballast a comparator circuit such that the comparator circuit;
compares a measure signal indicative of a measured value of a lamp parameter with a threshold hold signal indicative of a threshold value of said lamp parameter; and
provides a compare signal indicative of the comparison;
assembling into the ballast a clamp circuit such that the clamp circuit;
receives the compare signal; and
provides a clamp signal indicative of a result of the comparison; and
assembling into the ballast a control circuit such that the control circuit;
receives the clamp signal; and
in accordance with the clamp signal, performs one of;
reducing the lamp light output level to the low lamp light output level when the clamp signal is indicative of the measured value of the lamp parameter being less than the threshold value of the lamp parameter;
orreducing the lamp light output level to an intermediate lamp light output level when the clamp signal is indicative of the measured value of the lamp parameter being greater than or equal to the threshold value of the lamp parameter and subsequently reducing the lamp light output level to the low lamp light output level when the clamp signal subsequently is indicative of the measured value of the lamp parameter being less than the threshold value of the lamp parameter.
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Accused Products
Abstract
A method for assembling a lamp fixture incorporates a ballast and a compact gas discharge lamp into the fixture. A comparator circuit, clamp circuit, and control circuit are assembled into the ballast such that the comparator circuit compares a measured value of a lamp parameter to a threshold value and provides a signal indicative of the comparison; the clamp circuit receives the clamp signal and provides a clamp signal in accordance therewith; and the control circuit, in accordance with the clamp signal, controls the lamp such that the light level of the lamp can be lowered without perceptible flicker.
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Citations
8 Claims
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1. A method for assembling a light fixture for stably dimming a lamp light output level of a gas discharge lamp to a low lamp light output level without observable flicker, said method comprising:
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assembling into a light fixture a ballast and a gas discharge lamp; assembling into the ballast a comparator circuit such that the comparator circuit; compares a measure signal indicative of a measured value of a lamp parameter with a threshold hold signal indicative of a threshold value of said lamp parameter; and provides a compare signal indicative of the comparison; assembling into the ballast a clamp circuit such that the clamp circuit; receives the compare signal; and provides a clamp signal indicative of a result of the comparison; and assembling into the ballast a control circuit such that the control circuit; receives the clamp signal; and in accordance with the clamp signal, performs one of; reducing the lamp light output level to the low lamp light output level when the clamp signal is indicative of the measured value of the lamp parameter being less than the threshold value of the lamp parameter;
orreducing the lamp light output level to an intermediate lamp light output level when the clamp signal is indicative of the measured value of the lamp parameter being greater than or equal to the threshold value of the lamp parameter and subsequently reducing the lamp light output level to the low lamp light output level when the clamp signal subsequently is indicative of the measured value of the lamp parameter being less than the threshold value of the lamp parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification