WO2003061153A1 - Method and device for cancelling undesired common-mode signals on a transmission line - Google Patents

Method and device for cancelling undesired common-mode signals on a transmission line Download PDF

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Publication number
WO2003061153A1
WO2003061153A1 PCT/ES2003/000011 ES0300011W WO03061153A1 WO 2003061153 A1 WO2003061153 A1 WO 2003061153A1 ES 0300011 W ES0300011 W ES 0300011W WO 03061153 A1 WO03061153 A1 WO 03061153A1
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Prior art keywords
signals
common mode
transmission line
mode
common
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PCT/ES2003/000011
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Spanish (es)
French (fr)
Inventor
Jorge Vicente Blasco Claret
José Luis GONZÁLEZ MORENO
Antonio Poveda Lerma
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Diseño De Sistemas En Silicio, S.A.
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Application filed by Diseño De Sistemas En Silicio, S.A. filed Critical Diseño De Sistemas En Silicio, S.A.
Priority to AU2003206971A priority Critical patent/AU2003206971A1/en
Publication of WO2003061153A1 publication Critical patent/WO2003061153A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/30—Reducing interference caused by unbalance current in a normally balanced line

Definitions

  • the objective of the present invention is to achieve the cancellation of unwanted signals in a common way, which are mainly produced by the imbalance of the transmission lines used in telecommunication systems. This imbalance causes that when injecting signals in differential mode, part of this mode is transformed into common mode, the magnitude transformed being greater the greater the imbalance.
  • the injection is carried out in differential mode instead of in common mode to achieve lower levels of electromagnetic radiation and thus achieve greater coverage and greater transmission capacity by being able to use higher powers in line transmission without radiation risks.
  • the invention is applicable in any communication system, and is especially applicable in those communication systems that use the electricity network as a means to carry out data transmission, due to the great imbalance of this transmission medium.
  • Modern communication systems usually face the problem of obtaining maximum coverage and reaching maximum data transmission capacity and at the same time producing radiation levels lower than the maximum required in the applicable regulations. To achieve both objectives, it is issued / received in differential mode.
  • the injection of differential signals is based on the fact that any combination of signals can be broken down into signals in differential mode and common mode. So for example if Vi is the tension in one of The conductors of the transmission line, and V 2 is the voltage on the other conductor of the transmission line, the differential mode is calculated as:
  • any set of two input signals can be decomposed into a component in which the signals in the two lines of the line are equal in magnitude but 180 ° out of phase (differential mode component), and in another component equal in both magnitude and in phase
  • Differential mode signal transmission has the advantage of not producing electromagnetic radiation from a certain distance from the transmission lines.
  • Differential mode transmission presents the problem that if the line is unbalanced, a part of the differential signal injected into it becomes a common mode signal, this signal being undesirable since it is directly responsible for the electromagnetic radiation Produces on the line.
  • the invention has developed a method and a device for canceling unwanted common mode signals, which are mainly produced as a result of the imbalance transformation suffered by the signals that are injected differentially on a line transmission.
  • the main objective of this invention is to reduce the electromagnetic emissions of the transmission line, caused by the common mode component that is transmitted by the line.
  • the process of the invention is characterized in that it comprises the phases of detection and obtaining of the signals in common mode at the point of the transmission line in which the signal is injected in differential mode, reversal of the phase of the signals in common mode , and injection of common mode signals 180 ° out of phase.
  • This procedure cancels the common mode previously detected in the line, so that the electromagnetic radiation of the transmission line is reduced, which also allows increasing the power injected into telecommunications systems, thanks to which, in addition, You can get more communication and coverage.
  • the detection and obtaining of the signals in common mode is carried out by means of a resistive divider located between the conduits of the transmission line.
  • the 180 ° common mode signals are injected, by means of an amplifier with a bandwidth greater than or equal to that of the transmitted signal, at the midpoint of a transformer located between the conduits of the transmission line, this transformer being the used to inject the original signal in different mode Cial
  • This transformer is conventionally used in the transmission of data through an electrical network.
  • the invention also provides a device that performs the different described phases of the process of the invention, for which said device includes a detector that obtains the signals in common mode at the point of the transmission line into which the signal is injected in mode differential
  • inverter that reverses the phases of the signals in common mode. Subsequently, these inverted signals are injected by means of an amplifier at the midpoint of the transformer located between the conduits of the transmission line.
  • the inverter materializes in the amplifier itself which receives the signals in common mode and multiplies them by a negative factor equal to -1, so that it 180 ° out of phase with respect to the detected signal.
  • Figure 1 Schematically represents a functional block diagram of the generic embodiment of the common mode canceller device of the invention, which operates according to the method provided by the invention.
  • Figure 2. Shows a possible implementation of a possible embodiment of the functional modules represented in the previous figure.
  • the procedure for canceling signals in common mode is useful in any communications system, and is especially appropriate for communications systems that use the power grid as a transmission line, since for this there are restrictive norms of emitted interference (EMI) in different countries, and also due to the low balancing of low voltage electricity distribution networks since these have been specially designed for the transmission of electrical energy and not for the transmission of information .
  • EMI emitted interference
  • a communications system 1 that sends data to a communications system 2 through a transmission line 3, injects the signals in differential mode to reduce electromagnetic radiation as discussed in previous sections.
  • the common mode signals are delivered to a phase 5 inverter that shifts the 180 ° common mode signals and delivers them to an injector 6, which injects the common mode signals to the transmission line 3, so that the new signal injected cancels the common mode signals detected on the line.
  • the communications system 1 injects the signals in differential mode to the power grid 3 through a transformer 7 whose outputs are connected to the power grid 3 through two capacitors 8, to prevent the electric power component (50 or 60 Hz, depending on the network) from overloading the communications system 1.
  • a resistive divider 9 is used, whose output is delivered to the inverter circuit.
  • the inverter circuit is embodied in an amplifier 10 that takes the common mode signal referred to the ground, multiplies it by a negative factor equal to -1, and injects it into the midpoint of the transformer 7, so that the injected signal is distributed with the same magnitude and phase in both conduits of the transmission line 3.
  • the injected signal has exactly the same magnitude but 180 ° out of phase with respect to the common mode signal detected, and when applied with the same magnitude in both conduits of the transmission line 3, cancellation of the signals in common mode occurs, with the improvement that this represents.

Abstract

The invention relates to a method and device for cancelling undesired common-mode signals on a transmission line. In order to prevent electromagnetic radiation problems, signals are usually injected into a transmission line in a differential manner. As a result of line unbalance, part of the differential-mode signal is transformed into a common-mode signal, thereby generating undesired electromagnetic radiation. The invention is intended to: detect and obtain common-mode signals which appear on the transmission line (3); apply a 180° phase shift (5) to the common-mode signal obtained; and inject the phase-shifted common-mode signal into the transmission line in order to cancel the undesired common-mode signals. In this way, the radiation in the line is reduced, enabling the use of greater transmission power which, in turn, provides increased transmission capacity and coverage. The invention can be used for any communication system but, in particular, for those which use the electrical network as a data transmission means owing to the considerable line unbalance.

Description

PROCEDIMIENTO Y DISPOSITIVO DE CANCELACIÓN DE LAS SEÑALES EN MODO COMÚN NO DESEADAS EN UNA LINEA DE TRANSMISIÓNPROCEDURE AND DEVICE FOR CANCELLATION OF SIGNS IN COMMON MODE NOT DESIRED ON A TRANSMISSION LINE
OBJETO DE LA INVENCIÓN El objetivo de la presente invención consiste en conseguir la cancelación de las señales no deseadas de modo común, que se producen principalmente por el desbalanceo de las líneas de transmisión empleadas en los sistemas de telecomunicación. Este desbalanceo provoca que al inyectar señales en modo diferencial, parte de este modo se transforme en modo común, siendo la magnitud transformada mayor cuanto mayor es el desbalanceo.OBJECT OF THE INVENTION The objective of the present invention is to achieve the cancellation of unwanted signals in a common way, which are mainly produced by the imbalance of the transmission lines used in telecommunication systems. This imbalance causes that when injecting signals in differential mode, part of this mode is transformed into common mode, the magnitude transformed being greater the greater the imbalance.
Convencionalmente se realiza la inyección en modo diferencial en lugar de en modo común para conseguir menores niveles de radiación electromagnética y así alcanzar mayor cobertura y mayor capacidad de transmisión al poder utilizar potencias mayores en la transmisión por la línea sin que existan riesgos de radiación.Conventionally, the injection is carried out in differential mode instead of in common mode to achieve lower levels of electromagnetic radiation and thus achieve greater coverage and greater transmission capacity by being able to use higher powers in line transmission without radiation risks.
La invención es aplicable en cualquier sistema de comunicaciones, y es especialmente aplicable en aquellos sistemas de comunicaciones que utilizan la red eléctrica como medio para realizar la transmisión de datos, debido al gran desbalanceo de este medio de transmisión. ANTECEDENTES DE LA INVENCIÓN Los sistemas de comunicaciones modernos usualmente se enfrentan al problema de obtener máxima cobertura y alcanzar la máxima capacidad de transmisión de datos y a la vez producir niveles de radiación menores a los máximos exigidos en la normativa aplicable. Para conseguir alcanzar ambos objetivos, se emite/recibe en modo diferencial .The invention is applicable in any communication system, and is especially applicable in those communication systems that use the electricity network as a means to carry out data transmission, due to the great imbalance of this transmission medium. BACKGROUND OF THE INVENTION Modern communication systems usually face the problem of obtaining maximum coverage and reaching maximum data transmission capacity and at the same time producing radiation levels lower than the maximum required in the applicable regulations. To achieve both objectives, it is issued / received in differential mode.
Matemáticamente, la inyección de señales diferenciales se basa en que cualquier combinación de señales puede descomponerse en señales en modo diferencial y modo común. Así por ejemplo si Vi es la tensión en uno de los conductores de la línea de transmisión, y V2 es la tensión en el otro conductor de la línea de transmisión, el modo diferencial se calcula como:Mathematically, the injection of differential signals is based on the fact that any combination of signals can be broken down into signals in differential mode and common mode. So for example if Vi is the tension in one of The conductors of the transmission line, and V 2 is the voltage on the other conductor of the transmission line, the differential mode is calculated as:
ed = Vi - V2 e d = Vi - V 2
mientras que el modo común se calcula como:while the common mode is calculated as:
Vi + V2 ec = 2Vi + V 2 e c = 2
Por lo tanto cualquier conjunto de dos señales de entrada se puede descomponer en una componente en que las señales en las dos conducciones de la línea son iguales en magnitud pero desfasadas 180° (componente modo diferencial) , y en otro componente igual tanto en magnitud como en faseTherefore, any set of two input signals can be decomposed into a component in which the signals in the two lines of the line are equal in magnitude but 180 ° out of phase (differential mode component), and in another component equal in both magnitude and in phase
(componente modo común) en ambas conducciones.(common mode component) in both pipes.
La transmisión de señales en modo diferencial presenta la ventaja de no producir radiación electromagnética a partir de cierta distancia de las líneas de transmi- sión.Differential mode signal transmission has the advantage of not producing electromagnetic radiation from a certain distance from the transmission lines.
Este hecho se produce debido a que las corrientes en las conducciones de las líneas de transmisión son complementarias (igual magnitud pero desfasadas 180°, es decir opuestas) , produciendo un flujo magnético pequeño y reduciendo al mínimo las interferencias electromagnéticas emitidas (EMI) .This occurs because the currents in the transmission line conduits are complementary (equal magnitude but 180 ° out of phase, that is to say opposite), producing a small magnetic flux and minimizing emitted electromagnetic interference (EMI).
La transmisión en modo diferencial presenta el problema de que si la línea está desbalanceada, una parte de la señal diferencial inyectada en la misma se convierte en señal en modo común, siendo esta señal indeseable ya que es la responsable directa de la radicación electromagnética que se produce en la línea.Differential mode transmission presents the problem that if the line is unbalanced, a part of the differential signal injected into it becomes a common mode signal, this signal being undesirable since it is directly responsible for the electromagnetic radiation Produces on the line.
Por tanto, los sistemas de comunicaciones modernos intentan maximizar la componente en modo diferen- cial y minimizar la componente inyectada que se transforma en modo común, pero no consiguen eliminar dicha señal en modo común.Therefore, modern communications systems try to maximize the component in differential mode and minimize the injected component that is transformed in common mode, but they fail to eliminate this signal in common mode.
DESCRIPCIÓN DE LA INVENCIÓNDESCRIPTION OF THE INVENTION
Para resolver los inconvenientes anteriormente indicados, la invención ha desarrollado un procedimiento y un dispositivo para cancelar señales en modo común no deseadas, que se producen principalmente como consecuencia de la transformación por desbalanceo que sufren las señales que se inyectan en modo diferencial sobre una línea de transmisión. El objetivo principal de esta invención es reducir las emisiones electromagnéticas de la línea de transmisión, causadas por la componente en modo común que se transmite por la línea.In order to solve the aforementioned drawbacks, the invention has developed a method and a device for canceling unwanted common mode signals, which are mainly produced as a result of the imbalance transformation suffered by the signals that are injected differentially on a line transmission. The main objective of this invention is to reduce the electromagnetic emissions of the transmission line, caused by the common mode component that is transmitted by the line.
El procedimiento de la invención se caracteriza porque comprende las fases de detección y obtención de las señales en modo común en el punto de la línea de transmisión en el que se inyecta la señal en modo diferencial, inversión de la fase de las señales en modo común, e inyección de las señales en modo común desfasadas 180°. Mediante este procedimiento se cancela el modo común detectado previamente en la línea, de manera que se reduce la radiación electromagnética de la línea de transmisión, lo que además permite aumentar la potencia inyectada en los sistemas de telecomunicaciones, gracias a lo cual, además, se puede conseguir una mayor capacidad de comunicación y cobertura.The process of the invention is characterized in that it comprises the phases of detection and obtaining of the signals in common mode at the point of the transmission line in which the signal is injected in differential mode, reversal of the phase of the signals in common mode , and injection of common mode signals 180 ° out of phase. This procedure cancels the common mode previously detected in the line, so that the electromagnetic radiation of the transmission line is reduced, which also allows increasing the power injected into telecommunications systems, thanks to which, in addition, You can get more communication and coverage.
La detección y obtención de las señales en modo común se realiza mediante un divisor resistivo situado entre las conducciones de la línea de transmisión. Las señales en modo común desfasadas 180° se inyectan, mediante un amplificador con un ancho de banda mayor o igual que el de la señal transmitida, en el punto medio de un transformador situado entre las conducciones de la línea de transmisión, siendo este transformador el utilizado para inyectar la señal original en modo diferen- cial . Este transformador se emplea convencionalmente en la transmisión de datos a través de una red eléctrica.The detection and obtaining of the signals in common mode is carried out by means of a resistive divider located between the conduits of the transmission line. The 180 ° common mode signals are injected, by means of an amplifier with a bandwidth greater than or equal to that of the transmitted signal, at the midpoint of a transformer located between the conduits of the transmission line, this transformer being the used to inject the original signal in different mode Cial This transformer is conventionally used in the transmission of data through an electrical network.
Además la invención prevé un dispositivo que realiza las diferentes fases descritas del procedimiento de la invención, para lo que dicho dispositivo incluye un detector que obtiene las señales en modo común en el punto de la línea de transmisión en el que se inyecta la señal en modo diferencial .The invention also provides a device that performs the different described phases of the process of the invention, for which said device includes a detector that obtains the signals in common mode at the point of the transmission line into which the signal is injected in mode differential
Además comprende un inversor que invierte las fases de las señales en modo común. Posteriormente estas señales invertidas se inyectan mediante un amplificador en el punto medio del transformador situado entre las conducciones de la línea de transmisión.It also includes an inverter that reverses the phases of the signals in common mode. Subsequently, these inverted signals are injected by means of an amplifier at the midpoint of the transformer located between the conduits of the transmission line.
El inversor se materializa en el propio amplificador el cual recibe las señales en modo común y las multiplica por un factor negativo igual a -1, de forma que las desfasa 180° respecto a la señal detectada.The inverter materializes in the amplifier itself which receives the signals in common mode and multiplies them by a negative factor equal to -1, so that it 180 ° out of phase with respect to the detected signal.
A continuación para facilitar una mejor comprensión de esta memoria descriptiva y formando parte integrante de la misma se acompañan una serie de figuras en las que con carácter ilustrativo y no limitativo se ha representado el objeto de la invención.Next, in order to facilitate a better understanding of this descriptive report and forming an integral part thereof, a series of figures are attached in which the object of the invention has been shown as an illustrative and non-limiting nature.
BREVE ENUNCIADO DE LAS FIGURASBRIEF STATEMENT OF THE FIGURES
Figura 1.- Representa esquemáticamente un diagrama de bloques funcional de la realización genérica del dispositivo cancelador de modo común de la invención, que funciona de acuerdo al procedimiento previsto por la invención.Figure 1.- Schematically represents a functional block diagram of the generic embodiment of the common mode canceller device of the invention, which operates according to the method provided by the invention.
Figura 2.- Muestra una posible implementación de un posible ejemplo de realización de los módulos funcionales representados en la figura anterior.Figure 2.- Shows a possible implementation of a possible embodiment of the functional modules represented in the previous figure.
DESCRIPCIÓN DE LA FORMA DE REALIZACIÓN PREFERIDADESCRIPTION OF THE PREFERRED EMBODIMENT
A continuación se realiza una descripción de la invención basada en las figuras anteriormente comentadas. Tal y como ya fue comentado con anterioridad, el procedimiento de cancelación de las señales en modo común es útil en cualquier sistema de comunicaciones, y es especialmente apropiado para sistemas de comunicaciones que emplean como línea de transmisión la red eléctrica, ya que para ésta existen normas restrictivas de interferencias emitidas (EMI) en los distintos países, y también debido al poco balanceo que presentan las redes de distribución de electricidad de baja tensión puesto que éstas han sido especialmente concebidas para la transmisión de energía eléctrica y no para la transmisión de información.Below is a description of the invention based on the figures mentioned above. As previously mentioned, the procedure for canceling signals in common mode is useful in any communications system, and is especially appropriate for communications systems that use the power grid as a transmission line, since for this there are restrictive norms of emitted interference (EMI) in different countries, and also due to the low balancing of low voltage electricity distribution networks since these have been specially designed for the transmission of electrical energy and not for the transmission of information .
Un sistema de comunicaciones 1 que envía datos a un sistema de comunicaciones 2 a través de una línea de transmisión 3, inyecta las señales en modo diferencial para reducir las radiaciones electromagnéticas tal y como ya fue comentado en apartados anteriores .A communications system 1 that sends data to a communications system 2 through a transmission line 3, injects the signals in differential mode to reduce electromagnetic radiation as discussed in previous sections.
Por desgracia, el hecho de que la línea de transmisión esté mal balanceada implica que una parte de la señal diferencial inyectada en la misma se convierte en modo común, siendo éste hecho el responsable directo de la radiación en la línea de transmisión 3. Por tanto, es necesario eliminar las señales que se producen en modo común, para lo que la invención prevé la incorporación de un detector de las señales en modo común 4 , que está conectado entre las conducciones de la línea de transmisión 3, mediante el cual se obtienen las señales en modo común que están en la línea en ese momento.Unfortunately, the fact that the transmission line is poorly balanced implies that a part of the differential signal injected into it becomes common mode, being the one directly responsible for the radiation in the transmission line 3. Therefore , it is necessary to eliminate the signals that are produced in common mode, for which the invention provides for the incorporation of a detector of the signals in common mode 4, which is connected between the conduits of the transmission line 3, by which they are obtained the common mode signals that are on the line at that time.
Las señales en modo común son entregadas a un inversor de fase 5 que desfasa las señales en modo común 180° y las entrega a un inyector 6, que inyecta las señales en modo común a la línea de transmisión 3, de manera que la nueva señal inyectada cancela las señales en modo común detectadas en la línea.The common mode signals are delivered to a phase 5 inverter that shifts the 180 ° common mode signals and delivers them to an injector 6, which injects the common mode signals to the transmission line 3, so that the new signal injected cancels the common mode signals detected on the line.
Para el caso concreto en el que se utilice la red eléctrica como línea de transmisión 3, la implementación del dispositivo de la invención se muestra en la figura 2. En este caso el sistema de comunicaciones 1 inyecta las señales en modo diferencial a la red eléctrica 3 a través de un transformador 7 cuyas salidas se conectan a la red eléctrica 3 a través de dos condensadores 8, para evitar que la componente de potencia eléctrica (de 50 ó 60 Hz, dependiendo de la red) pueda sobrecargar al sistema de comunicaciones 1.For the specific case in which the power grid is used as transmission line 3, the implementation of the device of the invention is shown in Figure 2. In this case the communications system 1 injects the signals in differential mode to the power grid 3 through a transformer 7 whose outputs are connected to the power grid 3 through two capacitors 8, to prevent the electric power component (50 or 60 Hz, depending on the network) from overloading the communications system 1.
Para realizar la detección del modo común se utiliza un divisor resistivo 9, cuya salida se entrega al circuito inversor.To perform the common mode detection, a resistive divider 9 is used, whose output is delivered to the inverter circuit.
El circuito inversor está materializado en un amplificador 10 que toma la señal en modo común referida a la tierra, la multiplica por un factor negativo igual a -1, y la inyecta en el punto medio del transformador 7, de forma que la señal inyectada se distribuye con la misma magnitud y fase en ambas conducciones de la línea de transmisión 3. De esta forma, la señal inyectada tiene exactamente la misma magnitud pero desfasada 180° respecto a la señal en modo común detectada, y al aplicarse con la misma magnitud en ambas conducciones de la línea de transmisión 3, se produce la cancelación de las señales en modo común, con la mejora que ello representa. The inverter circuit is embodied in an amplifier 10 that takes the common mode signal referred to the ground, multiplies it by a negative factor equal to -1, and injects it into the midpoint of the transformer 7, so that the injected signal is distributed with the same magnitude and phase in both conduits of the transmission line 3. In this way, the injected signal has exactly the same magnitude but 180 ° out of phase with respect to the common mode signal detected, and when applied with the same magnitude in both conduits of the transmission line 3, cancellation of the signals in common mode occurs, with the improvement that this represents.

Claims

REIVINDICACIONES 1.- PROCEDIMIENTO DE CANCELACIÓN DE LAS SEÑALES EN MODO COMÚN NO DESEADAS EN UNA LINEA DE TRANSMISIÓN, en el que dichas señales en modo común se producen principalmente como consecuencia de la transformación por desbalanceo que sufren las señales que se inyectan en modo diferencial sobre una línea de transmisión (3) ; caracterizado porque comprende las fases de:CLAIMS 1.- CANCELLATION PROCEDURE OF SIGNALS IN COMMON MODE NOT DESIRED IN A TRANSMISSION LINE, in which said signals in common mode are mainly produced as a result of the imbalance transformation suffered by signals that are injected in differential mode over a transmission line (3); characterized in that it comprises the phases of:
- detección y obtención de las señales en modo común en el punto de la línea de transmisión en el que se inyecta la señal en modo diferencial;- detection and obtaining of the signals in common mode at the point of the transmission line where the signal is injected in differential mode;
- inversión de la fase de las señales en modo común previamente detectadas; inyección de las señales en modo común desfasadas 180°, para reducir el modo común y disminuir la radiación electromagnética que produce dicho modo común.- phase inversion of the previously detected common mode signals; injection of common mode signals 180 ° out of phase, to reduce the common mode and decrease the electromagnetic radiation produced by said common mode.
2.- PROCEDIMIENTO DE CANCELACIÓN DE LAS SEÑALES EN MODO COMÚN NO DESEADAS EN UNA LINEA DE TRANSMISIÓN, según reivindicación 1, caracterizado porque la detección y obtención de las señales en modo común se realiza mediante un divisor resistivo situado entre las conducciones de la línea de transmisión (3) .2.- CANCELLATION PROCEDURE OF THE SIGNALS IN COMMON MODE NOT WANTED IN A TRANSMISSION LINE, according to claim 1, characterized in that the detection and obtaining of the signals in common mode is carried out by means of a resistive divider located between the conduits of the line of transmission (3).
3.- PROCEDIMIENTO DE CANCELACIÓN DE LAS SEÑALES EN MODO COMÚN NO DESEADAS EN UNA LINEA DE TRANSMISIÓN, según reivindicación 1, caracterizado porque las señales en modo común desfasadas 180° se inyectan, mediante un amplificador con un ancho de banda mayor o igual que el de la señal transmitida, en el punto medio de un transformador situado entre las conducciones de la línea de transmisión, siendo este transformador el utilizado para inyectar las señales en la línea de transmisión (3) .3.- CANCELLATION PROCEDURE OF THE SIGNALS IN COMMON MODE NOT WANTED IN A TRANSMISSION LINE, according to claim 1, characterized in that the common mode signals 180 ° out of phase are injected, by means of an amplifier with a bandwidth greater than or equal to the of the transmitted signal, at the midpoint of a transformer located between the conduits of the transmission line, this transformer being used to inject the signals into the transmission line (3).
4.- DISPOSITIVO DE CANCELACIÓN DE LAS SEÑALES4.- SIGNAL CANCELLATION DEVICE
EN MODO COMÚN NO DESEADAS EN UNA LINEA DE TRANSMISIÓN, en el que dichas señales en modo común a cancelar se producen principalmente como consecuencia de la transformación que sufren las señales que se inyectan en modo diferencial para disminuir la radiación electromagnética de la línea de transmisión; se caracteriza porque comprende:IN COMMON MODE NOT DESIRED IN A TRANSMISSION LINE, in which said signals in common mode to be canceled are mainly produced as a result of the transformation the signals that are injected in differential mode suffer to decrease the electromagnetic radiation of the transmission line; It is characterized because it includes:
- un detector (4) que obtiene las señales en modo común en el punto de la línea de transmisión (3) en el que se inyecta la señal en modo diferencial;- a detector (4) that obtains the signals in common mode at the point of the transmission line (3) in which the signal is injected in differential mode;
- un inversor que invierte la fase de las señales obtenidas en modo común;- an inverter that reverses the phase of the signals obtained in common mode;
- un inyector de las señales en modo común desfasadas 180° en la línea de transmisión.- an injector of common mode signals 180 ° out of phase in the transmission line.
5.- DISPOSITIVO DE CANCELACIÓN DE LAS SEÑALES EN MODO COMÚN NO DESEADAS EN UNA LINEA DE TRANSMISIÓN, según reivindicación 4, caracterizado porque el detector se materializa mediante un divisor resistivo (9) situado entre las conducciones de la línea de transmisión.5.- CANCELLATION DEVICE OF THE SIGNS IN COMMON MODE NOT WANTED IN A TRANSMISSION LINE, according to claim 4, characterized in that the detector is materialized by a resistive divider (9) located between the conduits of the transmission line.
6.- DISPOSITIVO DE CANCELACIÓN DE LAS SEÑALES EN MODO COMÚN NO DESEADAS EN UNA LINEA DE TRANSMISIÓN, según reivindicación 4, caracterizado porque el inversor de fase de las señales en modo común y el inyector en modo común se materializan en un amplificador (10) , que multiplica las señales en modo común por un factor -1 para producir un desfase de 180°; estando el amplificador (10) conectado al punto medio de un transformador (7) , situado entre las conducciones de la línea de transmisión (3) , a través del cual se inyectan las señales en modo diferencial para su transmisión por la línea (3) . 6.- CANCELLATION DEVICE OF THE SIGNALS IN COMMON MODE NOT WANTED IN A TRANSMISSION LINE, according to claim 4, characterized in that the phase inverter of the signals in common mode and the injector in common mode materialize in an amplifier (10) , which multiplies the signals in common mode by a factor -1 to produce a 180 ° offset; the amplifier (10) being connected to the midpoint of a transformer (7), located between the conduits of the transmission line (3), through which the signals are injected in differential mode for transmission over the line (3) .
PCT/ES2003/000011 2002-01-21 2003-01-14 Method and device for cancelling undesired common-mode signals on a transmission line WO2003061153A1 (en)

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ES200200119A ES2192471B1 (en) 2002-01-21 2002-01-21 PROCEDURE AND DEVICE FOR CANCELLATION OF SIGNS IN COMMON MODE NOT WISHED IN A TRANSMISSION LINE.
ESP200200119 2002-01-21

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US7633964B2 (en) 2004-05-27 2009-12-15 Panasonic Corporation Communication apparatus, communication system and communication method

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DE3237919A1 (en) * 1982-10-13 1984-04-19 kabelmetal electro GmbH, 3000 Hannover Circuit for protecting telecommunication cables against external current interference
DE3713877A1 (en) * 1987-04-25 1988-11-17 Ant Nachrichtentech Method and circuit arrangement for cancelling induced noise voltages
DE3744130A1 (en) * 1987-12-24 1989-07-06 Licentia Gmbh Circuit arrangement for reducing longitudinal voltages on two-wire lines

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GB2053626A (en) * 1979-06-28 1981-02-04 Kabel Metallwerke Ghh Reducing interference in telecommunication lines
DE3237919A1 (en) * 1982-10-13 1984-04-19 kabelmetal electro GmbH, 3000 Hannover Circuit for protecting telecommunication cables against external current interference
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DE3744130A1 (en) * 1987-12-24 1989-07-06 Licentia Gmbh Circuit arrangement for reducing longitudinal voltages on two-wire lines

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7633964B2 (en) 2004-05-27 2009-12-15 Panasonic Corporation Communication apparatus, communication system and communication method

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ES2192471B1 (en) 2005-02-01
ES2192471A1 (en) 2003-10-01
AU2003206971A1 (en) 2003-07-30

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