Safety flashing detector for traffic lamps
First Claim
Patent Images
1. An LED traffic lamp comprising:
- at least one LED light engine that generates light for the traffic lamp; and
an LED current sense circuit that is configured to monitor the current through the LED light engine and feed one or more output signals to a safety flashing detector and a fuse blow out circuit, wherein the safety flashing detector is configured to detect one or more abnormal fluctuations in the LED light engine current or frequency when such current or frequency should be steady at a predetermined threshold and to shut down the LED light engine.
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Abstract
A safety flashing detector that suitably detects unintentional flashing of the LED light engine in a traffic lamp is provided. The LED light engine may flash unintentionally when there are failures (hardware or software) inside a traffic lamp. In certain embodiments, unintentional flashing may be detected using a current sensor. If unintentional flashing is detected, the flashing detector may activate and shut down the LED light engine to remove the hazardous failure and eventually triggers the fuse blowout circuit. Hardware circuitry is suitably employed for both reliability and safety purposes, but software may also be employed.
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Citations
12 Claims
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1. An LED traffic lamp comprising:
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at least one LED light engine that generates light for the traffic lamp; and an LED current sense circuit that is configured to monitor the current through the LED light engine and feed one or more output signals to a safety flashing detector and a fuse blow out circuit, wherein the safety flashing detector is configured to detect one or more abnormal fluctuations in the LED light engine current or frequency when such current or frequency should be steady at a predetermined threshold and to shut down the LED light engine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification