| 摘要 |
The invention relates to a transmitting device for transmission through space, using electromagnetic waves of the infrared and/or visible and/or ultraviolet bands produced by one or several diodes producing electroluminescent light. The device is connected by its input terminals (1) to an a.c. energy distribution system. A mains filter (2) reduces the conducted electromagnetic disturbances produced by the power circuits comprising a rectifier (3), a power-factor-correction circuit (4), an auxiliary power supply (5) and a DC-to-DC converter (8). The output of the DC-to-DC converter (8) is connected to several high power light-emitting diodes connected in series (9). A receiving set for transmission via power distribution lines (6) delivers demodulated signals applied to the control circuitry (7) which provides the current command of the DC-to-DC converter (8) and the modulated current applied to the light-emitting diodes (9) through the modulation transformer (10), as a function of the demodulated signals and of the temperature which is measured by a temperature sensor (11). The produced light is modulated as a function of the demodulated signals.
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