LED EMITTER FOR OPTICAL TRAFFIC CONTROL SYSTEMS
First Claim
1. A light emitter for a traffic control preemption system, comprising:
- a plurality of groups of infrared (IR) LEDs, each group including one or more IR LEDs;
a power source coupled to the groups of LEDs;
a plurality of controlled current sources coupled to the plurality of groups of LEDs, respectively; and
a controller coupled to the plurality of controlled current sources, wherein the controller is configured to trigger an IR light pulse pattern from the groups of LEDs and maintain a first level of IR radiant power from the groups of LEDs using individual control of respective current levels to the groups of LEDs in response to current sense levels from the groups of LEDs, wherein the pulse pattern and first level of IR radiant power activate preemption in the traffic control preemption system.
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Accused Products
Abstract
A light emitter for a traffic control preemption system. The emitter includes a plurality of groups of infrared (IR) LEDs and a power source coupled to the groups of LEDs. A plurality of controlled current sources is coupled to the plurality of groups of LEDs, respectively. A controller is configured to trigger an IR light pulse pattern from the groups of LEDs and maintain a first level of IR radiant power from the groups of LEDs using individual control of respective current levels to the groups of LEDs in response to current sense levels from the groups of LEDs. The pulse pattern and first level of IR radiant power activate preemption in the traffic control preemption system.
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Citations
19 Claims
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1. A light emitter for a traffic control preemption system, comprising:
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a plurality of groups of infrared (IR) LEDs, each group including one or more IR LEDs; a power source coupled to the groups of LEDs; a plurality of controlled current sources coupled to the plurality of groups of LEDs, respectively; and a controller coupled to the plurality of controlled current sources, wherein the controller is configured to trigger an IR light pulse pattern from the groups of LEDs and maintain a first level of IR radiant power from the groups of LEDs using individual control of respective current levels to the groups of LEDs in response to current sense levels from the groups of LEDs, wherein the pulse pattern and first level of IR radiant power activate preemption in the traffic control preemption system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A light emitter for a traffic control preemption system, comprising:
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a plurality of groups of infrared (IR) LEDs, each group including one or more IR LEDs; a plurality of capacitors coupled to the groups of LEDs, respectively; a power source coupled to capacitors; a plurality of controlled current sources coupled to the plurality of groups of LEDs, respectively; at least one trigger switch coupled to the controlled current sources; and a microcontroller coupled to the at least one trigger switch, wherein the microcontroller is configurable with a parameter for specifying different levels of IR radiant power and is configured to trigger an IR light pulse pattern from the groups of LEDs and maintain a first level of IR radiant power from the groups of LEDs using individual control of respective current levels to the groups of LEDs in response to current sense levels from the groups of LEDs, wherein the pulse pattern and first level of IR radiant power activate preemption in the traffic control preemption system. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A light emitter for a traffic control preemption system, comprising:
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a plurality of groups of infrared (IR) LEDs, each group including one or more IR LEDs; means for providing power to the groups of LEDs; means for controlling current to the plurality of groups of LEDs; and programmable means for triggering an IR light pulse pattern from the groups of LEDs and for maintaining a first level of IR radiant power from the groups of LEDs using individual control of respective current levels to the groups of LEDs in response to current sense levels from the groups of LEDs, wherein the pulse pattern and first level of IR radiant power activate preemption in the traffic control preemption system.
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Specification