LED traffic signal without power supply or control unit in signal head
First Claim
Patent Images
1. A traffic signal, for controlling vehicular traffic, comprising:
- a light source including a light emitting diode (LED) array,a power regulator associated with the light source, the power regulator provided in a traffic signal housing and adapted to receive a supply voltage and an input voltage signal and to control an input current to the light source, anda traffic signal controller, provided in a cabinet physically separate from the traffic signal housing, the traffic signal controller adapted to provide the input voltage signal to the power regulator,wherein the power regulator is adapted to measure a voltage generated across a resistance by the input current to the light source and to control the input current to the light source according to the measured voltage and the input voltage signal.
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Abstract
A traffic signal is provided for controlling vehicular traffic. The traffic signal includes a light source (10) having a light emitting diode (LED) array (D1, D2, D3, D4). A power regulator (14) is associated with the light source and is constructed and arranged to control input current to the light source. A traffic signal controller (16) is remote from the light source and the power regulator. The traffic signal controller is constructed and arranged to provide an input voltage signal to the power regulator, with the input current being based on the input voltage signal.
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Citations
21 Claims
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1. A traffic signal, for controlling vehicular traffic, comprising:
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a light source including a light emitting diode (LED) array, a power regulator associated with the light source, the power regulator provided in a traffic signal housing and adapted to receive a supply voltage and an input voltage signal and to control an input current to the light source, and a traffic signal controller, provided in a cabinet physically separate from the traffic signal housing, the traffic signal controller adapted to provide the input voltage signal to the power regulator, wherein the power regulator is adapted to measure a voltage generated across a resistance by the input current to the light source and to control the input current to the light source according to the measured voltage and the input voltage signal. - 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 controlling a light source including at least one light emitting diode (LED), the method including the steps of:
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providing a supply voltage and an input voltage signal, from a source, to a power regulator provided in a traffic signal housing and associated with the light source, the source provided in a cabinet physically separate from the traffic signal housing, the power regulator measuring a voltage generated across a resistance by an input current to the light source and controlling, according to the measured voltage and the input voltage signal, the input current to the light source to illuminate the LED, and varying the input current based on certain conditions associated with the light source. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification