Device and system for communicating on a supply line

1. A coupling system between a control unit and a wired communications link, the wired communications link having a characteristic line impedance and being capable of conveying a signal simultaneously comprising an electric power supply and data, the control unit including an electric power supply terminal and a data terminal, said coupling system having an input impedance,

wherein the coupling system includes means for matching the input impedance to the characteristic line impedance,

wherein the means for matching include a load with a variable value depending on an output current consumed by the control unit at the output of said coupling system, and wherein the coupling system has an input voltage of variable value,

wherein said load is capable of ensuring that a variable input current is consumed by the coupling system and substantially equal to the value of the input voltage divided by the value of the characteristic line impedance, and

wherein the coupling system is capable of receiving the signal simultaneously comprising the electric power supply and the data, the electric power supply and the data having a same frequency spectrum.

2. The coupling system according to claim 1 , wherein the matching means are capable of matching the input impedance to the characteristic line impedance for a predetermined range of frequencies, called matching band, and in that the spectrum of the signal is at least partly comprised in said matching band.

3. The coupling system according to claim 2 , wherein the matching band is equal to the spectrum of the signal received at the input of the coupling system.

4. The coupling system according to claim 2 , wherein the matching band is the range of frequencies substantially comprised between 0 and 20 MHz, preferably comprised between 0 and 15 MHz.

5. The coupling system according to claim 2 ,

wherein the matching means include a load with a variable value depending on an output current consumed by the control unit at the output of said coupling system,

wherein the coupling system comprises an energy recovery device intended to be connected between the wired communications link and the electric power supply terminal, and including said variable load, and a data transmission device intended to be connected between the wired communications link and the data terminal and including an attenuator capable of strongly reducing a second current, consumed at the input of said transmission device,

wherein the data transmission device is capable of only transmitting the data contained in a predetermined frequency interval, called a transmission band, and

wherein the transmission band is comprised in the matching band.

6. The coupling system according to claim 1 , wherein the coupling system has an input voltage of constant value, and wherein said load is capable of ensuring that a constant input current is consumed by the coupling system.

7. The coupling system according to claim 1 , wherein said load with the variable value comprises a current reservoir laid out at the output of a current generator.

8. A device for controlling at least one electronic switch, comprising a control unit for controlling each electronic switch, said control unit including an electric power supply terminal and a data terminal, and a coupling system between said control unit and wired communications link, the wired communications link being capable of conveying a signal simultaneously comprising an electric power supply and data, wherein the coupling system is in accordance with claim 1 .

9. A coupling system between a control unit and a wired communications link, the wired communications link having a characteristic line impedance and being capable of conveying a signal simultaneously comprising an electric power supply and data, the control unit including an electric power supply terminal and a data terminal, said coupling system having an input impedance,

wherein the coupling system includes means for matching the input impedance to the characteristic line impedance,

wherein the means for matching include a load with a variable value depending on an output current consumed by the control unit at the output of said coupling system,

wherein the coupling system is capable of receiving the signal simultaneously comprising the electric power supply and the data, the electric power supply and the data having a same frequency spectrum, and

wherein the coupling system comprises an energy recovery device intended to be connected between the wired communications link and the electric power supply terminal, and including the load with the variable value, and a data transmission device intended to be connected between the wired communications link and the data terminal and including an attenuator capable of strongly reducing a second current, consumed at an input of said data transmission device.

10. The coupling system according to claim 9 , wherein the data transmission device includes a low-pass filter.

11. The coupling system according to claim 9 , wherein the data transmission device is capable of only transmitting the data contained in a predetermined frequency interval, called a transmission band.

12. The coupling system according to claim 11 , wherein the transmission band is the interval of frequencies substantially comprised between 0 and 5 MHz, preferably comprised between 0 and 3 MHz.

13. The coupling system according to claim 9 , wherein the matching means are capable of matching the input impedance to the characteristic line impedance for a predetermined range of frequencies, called matching band, and in that the spectrum of the signal is at least partly comprised in said matching band.

14. The coupling system according to claim 9 , wherein the coupling system has an input voltage of constant value, and wherein said load is capable of ensuring that a constant input current is consumed by the coupling system.

15. The coupling system according to claim 9 , wherein said load with the variable value comprises a current reservoir laid out at the output of a current generator.

16. A device for controlling at least one electronic switch, comprising a control unit for controlling each electronic switch, said control unit including an electric power supply terminal and a data terminal, and a coupling system between said control unit and a wired communications link capable of conveying a signal simultaneously comprising an electric power supply and data, wherein the coupling system is in accordance with claim 9 .