Solid state light with self diagnostics and predictive failure analysis mechanisms
First Claim
1. A solid state light, comprising;
- a solid state light source producing light output; and
a monitoring circuit coupled to said light source predicting, prior to a degradation of said solid state light output below a first predetermined threshold, when said light output will fall below said first predetermined threshold.
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Accused Products
Abstract
A solid state light apparatus ideally suited for use in traffic control signals having a Self Diagnostic/Predictive Failure Analysis (SD/PFA) function facilitating a real time status of the signal as well as prediction of failure years in advance of the actual failure. Unlike incandescent signals, all LED based signals degrade over time until they are no longer in DOT light output specifications. Current state of the art solid state signals must be periodically monitored to see if the light output is in specification. This is done by having DOT or contracted personnel ascend in a bucket truck and place a light meter on the signal typically on an annual basis. A signal system with SD/PFA coupled with a modem or RF link provides real time data, without the use of a bucket truck on the status of the signal. The system also provides data which allows the determination via an algorithm of when the signal will go below light output specifications in the future.
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Citations
20 Claims
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1. A solid state light, comprising;
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a solid state light source producing light output; and
a monitoring circuit coupled to said light source predicting, prior to a degradation of said solid state light output below a first predetermined threshold, when said light output will fall below said first predetermined threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of operating a solid state light source, comprising the steps of:
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driving the solid state light providing a light output source and having operating parameters; and
monitoring at least one said operating parameter to predict when said light output, prior to a degradation of said solid state light output below a first predetermined threshold, will fall below said first predetermined threshold. - View Dependent Claims (17, 18, 19, 20)
a drive current, a drive voltage, a drive voltage duty cycle, an operating temperature and time.
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18. The method of operating a solid state light source in claim 16 further comprising the step of generating a notification signal indicative of said prediction when said light output will fall below said first predetermined threshold.
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19. The method of operating a solid state light source in claim 18 wherein said notification signal is selected from the group comprising
an RF signal, an electrical signal, and an optical signal indicative of when said light output is predicted to fall below said first predetermined threshold within a predetermined time period. -
20. The method of operating a solid light source in claim 16 wherein said first predetermined threshold is the minimum light required of a traffic signal for signaling automobiles.
Specification