Method and device to emulate a railway searchlight signal with light emitting diodes
First Claim
Patent Images
1. A searchlight signal with a multiple color display aspects comprising:
- a color selection interface to select the display aspect, said color selection interface connected to repeater contacts, a plurality of Light Emitting Diodes, and a switching power supply, the switching power supply coupled to the Light Emitting Diodes via the color selection interface;
wherein the display aspect is selected from the group consisting of red, yellow, green and off.
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Abstract
A railway searchlight signal uses a printed circuit board populated by three arrays (green, red and yellow) of LEDs. The LEDs are lit by a standard color light power supply unit (PSU). As only one array of LEDs is lit at a time, an interface between the PSU and the LEDs is provided to select which LED array to couple with the PSU. External repeater contacts provide information on which aspect is displayed. This searchlight system design is failsafe in that no single failure of a component will produce a less restrictive aspect.
133 Citations
20 Claims
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1. A searchlight signal with a multiple color display aspects comprising:
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a color selection interface to select the display aspect, said color selection interface connected to repeater contacts, a plurality of Light Emitting Diodes, and a switching power supply, the switching power supply coupled to the Light Emitting Diodes via the color selection interface;
wherein the display aspect is selected from the group consisting of red, yellow, green and off. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A searchlight signal with a multiple color display aspect comprising:
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a color selection interface;
a plurality of light emitting diodes; and
a switching power supply having cold filament test capability, the switching power supply coupled to the light emitting diodes via the color selection interface. - View Dependent Claims (8, 9, 10, 11, 12, 13)
said light emitting diodes arranged in said arrays are electrically interconnected in both series and parallel.
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13. The signal of claim 12, wherein said light emitting diodes emit red, green, and yellow light.
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14. A searchlight signal with a multiple color display aspect comprising:
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a color selection interface comprising a switch means;
a plurality of light emitting diodes; and
a switching power supply;
the switching power supply coupled to the light emitting diodes;
wherein said switch means configured in a fail safe manner so that if one switch means fails the resulting display aspect will not be less restrictive than input means request. - View Dependent Claims (15, 16, 17, 18, 19, 20)
said light emitting diodes arranged in said arrays are electrically interconnected in both series and parallel.
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20. The signal of claim 19, wherein said light emitting diodes emit red, green, and yellow light.
Specification