Communications: electrical – Systems – Selsyn type
Patent
1993-06-04
1996-03-05
Swarthout, Brent A.
Communications: electrical
Systems
Selsyn type
34031001, 34031007, 307140, H04M 1104
Patent
active
054971420
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a directional separator-coupler circuit for medium-frequency carrier currents on an electrical line of the low-voltage alternating network.
2. The Prior Art
The transmission of information on networks for distribution and supply of low-voltage electrical energy is currently carried out by means of transmitter-receiver circuits with carrier currents E, which are coupled to the network, as represented in FIG. 1a, by means of a separator-coupler circuit D, so as to provide maximum coupling to the low-voltage network and minimum disturbance both to the network itself, called upstream network, and to the downstream network, most often consisting of the power supply installation of a subscriber customer. This type of coupler separator circuit must, on the one hand, provide matching of the transmitter-receiver circuit E, and, on the other hand, decoupling between the upstream network and the downstream network. For this purpose, a voltage coupling, by means of a transmitter coupling transformer, has been used up until now as separator-coupler circuit, as represented in FIG. 1b; the low-voltage circuits with carrier currents being thus completely separated galvanically. Such circuits give satisfaction from the point of view of decoupling of direct or homopolar current, but they do not make it possible, however, to produce a true directional coupler circuit.
SUMMARY OF THE INVENTION
The object of the present invention is the implementation of a directional separator-coupler circuit making it possible to provide maximum decoupling between the transmitter-receiver E and the downstream network B while the coupling between the same transmitter-receiver E and the upstream network A is optimum.
Another object of the present invention is the implementation of a directional separator-coupler circuit in which the abovementioned directional sense may be reversed, maximum decoupling between transmitter-receiver E and upstream network A and optimum coupling between transmitter-receiver E and downstream network B.
Another object of the present invention is also the implementation of a separator-coupler circuit making it possible to provide effective filtering of the parasitic signals, originating from the downstream network B, and capable of propagating towards the upstream network A and the transmitter-receiver E or vice versa.
The directional separator-coupler circuit for medium-frequency carrier currents on an electrical line of the low-voltage alternating network, which is the subject of the present invention, comprises a parallel resonant circuit inserted into the electrical line, whose resonance frequency is close to the central frequency of the pass band of the medium-frequency carrier currents, and a circuit for transmission-reception of said carrier currents voltage-coupled to said resonant circuit by a connecting circuit. It is noteworthy in that the connecting circuit also comprises a series connecting branch making it possible to provide a current coupling for the transmission-reception circuit and for the medium-frequency line and decoupling of the transmission-reception circuit from the line at the frequency of the low-voltage network.
The directional separator-coupler circuit, which is the subject of the invention, finds an application in the production of systems for transmission of information by medium-frequency carrier currents on low-voltage electrical energy power supply networks.
BRIEF DESCRIPTION OF THE DRAWINGS
A more detailed description of a directional separator-coupler circuit, subject of the present invention, will now be given below in connection with the drawings in which, over and above FIGS. 1a and 1b which relate to separator-coupler circuits of the prior art,
FIG. 2 represents a directional separator-coupler circuit in accordance with the object of the present invention,
FIG. 3 represents a first embodiment variant of the directional separator-coupler circuit according to the invention as represented in FIG.
REFERENCES:
patent: 3702460 (1972-11-01), Blose
patent: 3924223 (1975-12-01), Whyte et al.
patent: 4371867 (1983-02-01), Gauder
patent: 4383243 (1983-05-01), Kru/ gel
patent: 4408186 (1983-10-01), Howell
patent: 4668934 (1987-05-01), Shuey
patent: 4885563 (1989-12-01), Johnson et al.
patent: 4903006 (1990-02-01), Boomgaard
patent: 4973940 (1990-11-01), Sakai et al.
patent: 5066939 (1991-11-01), Mansfield, Jr.
Electricite de France
Swarthout Brent A.
Tong Nina
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