Electroluminescent emission device for optical transmission in free space

Abstract

The invention relates to an emission device for transmission through space, using electromagnetic waves in the infrared range and / or visible range and / or ultraviolet range that are produced by one or more light-emitting diodes. The device is connected via its input terminals (1) to an energy distribution network. A mains filter (2) reduces the electromagnetic interference produced by the power circuits, which comprise a rectifier (3), a power-factor correction circuit (4), an auxiliary power supply (5) and a DC / DC converter (8). The DC / DC converter (8) has its output connected to several series-connected light-emitting diodes (9). An assembly for receiving the transmissions via energy distribution network lines (6) delivers demodulated signals applied to the control circuit (7), which delivers the current setpoint of the DC / DC converter (8) and the modulated current applied to the light-emitting diodes (9) through the modulation transformer (10), according to the demodulated signals and the temperature measured by a temperature sensor (11). The light produced is modulated according to the demodulated signals.

Description

technical field [0001] The invention relates to a transmission device for light transmission through space using electromagnetic waves in the infrared and / or visible and / or ultraviolet bands generated by one or several electroluminescent diodes. Background technique [0002] Hereinafter, the word "light" shall mean electromagnetic radiation, which may include visible light and / or infrared and / or ultraviolet light. Hereinafter, the expression "electroluminescent diode" denotes any type of diode capable of generating electroluminescent light. Such electroluminescent diodes may be, for example, infrared electroluminescent diodes, phosphorous-containing high-power incandescent electroluminescent diodes, organic electroluminescent diodes, and the like. [0003] In French Patent Application No. 0409939 entitled "Dispositif d'émission pour la transmission optique enespace libre" (Lighting device for free-space optical transmission) and "Transmitting device for free-space optical t...

AI Technical Summary

Problems solved by technology

[0007] According to the known methods and devices, the problem of the manner in which the signal to be transmitted is transmitted to the light-emitting diodes has not been addressed in a satisfactory manner for all applications, since the use of two different wirings is obviously more complex than that used for lighting only Traditional wiring of luminaires is more expensive

In order to use only one type of wiring, one might expect to use a radio link to carry the signal to be transmitted to each luminaire, but this solution loses the main advantage of free-space optical transmission, which is that it does not use the radio spectrum

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