EP1779645A2 - Circuit pour supprimer des signaux parasites dans l'embranchement de reception d'un modem d'un appareil menager - Google Patents

Circuit pour supprimer des signaux parasites dans l'embranchement de reception d'un modem d'un appareil menager

Info

Publication number
EP1779645A2
EP1779645A2 EP05773841A EP05773841A EP1779645A2 EP 1779645 A2 EP1779645 A2 EP 1779645A2 EP 05773841 A EP05773841 A EP 05773841A EP 05773841 A EP05773841 A EP 05773841A EP 1779645 A2 EP1779645 A2 EP 1779645A2
Authority
EP
European Patent Office
Prior art keywords
circuit
modem
receiving
branch
circuit arrangement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05773841A
Other languages
German (de)
English (en)
Inventor
Udo Hertel
Roman Makhthyuk
Simon Piermeier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens Hausgeraete GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of EP1779645A2 publication Critical patent/EP1779645A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0264—Arrangements for coupling to transmission lines
    • H04L25/0266—Arrangements for providing Galvanic isolation, e.g. by means of magnetic or capacitive coupling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H04B3/56—Circuits for coupling, blocking, or by-passing of signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5404—Methods of transmitting or receiving signals via power distribution lines
    • H04B2203/5425—Methods of transmitting or receiving signals via power distribution lines improving S/N by matching impedance, noise reduction, gain control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5462—Systems for power line communications
    • H04B2203/5491—Systems for power line communications using filtering and bypassing

Definitions

  • the invention relates to a circuit arrangement for suppressing Störsig- signals in the receiving branch of a transmission branch and the reception branch containing modem of a transmission device equipped with a transmitting device for the delivery and a receiving device for receiving data signals, using ei ⁇ ner filter arrangement.
  • the respective transmitting / receiving device comprises a modem connected to the respective household appliance, which is connected via a coupler to an AC line voltage arrangement , Both the modem and the coupler contain various filters, such as low-pass filters and bandpass filters.
  • filters such as low-pass filters and bandpass filters.
  • a communication system operating with data modem is known (DE 38 30 338 C2) in which unwanted signal frequencies of a so-called secondary channel (300 to 350 Hz band) are suppressed in the respective modem receiving branch by means of a blocking filter and only a so-called Main channel signal in a frequency band of 600 to 3000Hz is transmitted.
  • the relevant circuit measure namely the use of a notch filter for a certain frequency range, could also be used to suppress interference signals that are associated with one of a useful signal receiving frequency different frequency occur. If such interference signals with frequencies above and below a useful signal reception frequency are to be taken into consideration, however, a plurality of appropriately dimensioned blocking filters should be provided, which would mean a not inconsiderable amount of circuitry that should actually be avoided.
  • the receiving branch is relatively broadband and high impedance and has an input resistance of, for example 150k ⁇ .
  • Such relationships are encountered e.g. for the IC module ST7538 of the company STMicroelectronics, which is intended for use as a transceiver module in a modem of a household appliance.
  • interference signals from relatively high-impedance interference signal sources occur in the reception branch of such a module, then these interference signals, unless separate measures have been taken, would somehow plug the input circuit in the receiving branch of the relevant IC component, so that the actual useful signal will no longer be recognized by the relevant reception branch although it might occur with a useful signal frequency different from the interference signal frequencies and emitted by a relatively low-impedance useful signal source (eg with Ri »1 ⁇ ).
  • Interference signals of the aforementioned type can occur both on the respective modem receiving line occurring pulse-shaped interference signals, which are supplied by other devices, but possibly also in which the relevant modem containing home appliance are caused, as well as low-frequency noise, which with Fre ⁇ occur frequencies of n times the mains AC voltage frequency, where n> 1 applies.
  • the pulse-shaped interfering signals mentioned can be, for example, harmonics of the switching frequency of a switched-mode power supply for the modem of a domestic appliance. spindles.
  • the switching power frequency is 44kHz
  • the frequency of the third harmonic of this switching frequency is 132kHz; It is thus clearly in the frequency range of the CENELEC band C (125-14OkHz), which is specified for so-called power-line communication, ie for power line communication in Europe.
  • the invention is based on the object, a circuit arrangement of the type mentioned in such a way that with relatively low circuitry Auf ⁇ wall in the receiving branch of said modem occurring interference signals can be effectively suppressed suppressed electrically and / or magnetically by relatively high-impedance interference signal sources are coupled into said reception branch of the modem or supplied to this.
  • the invention brings with it the advantage that, with very low scenstechni ⁇ 's effort, namely solely by the parallel connection of a bandpass filter to the input circuit of the said receiving circuit of the modem and by setting the resonant frequency of the bandpass filter to a value above or below the respective Störsignalfrequenz is reached, that the circuit input of a relatively high input impedance (of eg 150 k ⁇ ) having receiving circuit of the modem in the frequency range of the interference signals has a relatively low impedance (of eg 1 k ⁇ ).
  • the circuit input of the mentioned receiving device of the modem is made relatively low-ohmic for frequencies above and below the resonance frequency of said bandpass filter.
  • interference signals originating from relatively high-impedance interfering signal sources collapse in their voltages due to the aforementioned low resistance of the circuit input of the receiving device and thus no longer adversely affect the reception branch of the mentioned modem can; they are sufficiently suppressed.
  • the fenden interference signals from the domestic appliance or the modem or the Strommentssein ⁇ direction for the modem originate and coupled capacitively and / or magnetically in the Empfangs ⁇ circuit of the modem, otherwise required costly Abschir ⁇ tion measures to transmitters or in the receiving branch of the modem and the Use of magnetically shielded components and / or shielding plates dispensable.
  • the frequency selectivity of the bandpass filter is not primarily exploited in order to transmit the useful signal at the bandpass filter resonance frequency, but the effect is exploited here that the bandpass filter is used in the range of has a low impedance from its Resonanzfre ⁇ quency in the frequency interference and makes in consequence of its parallel connection to the input circuit of the receiving circuit of the modem makes this input circuit low impedance.
  • the voltages of the relevant interference signals which are coupled in by relatively high-impedance interference signal sources in the signal input of the input circuit of the modem, collapse and thus no longer clog the receiving circuit of the modem.
  • the useful signals which are supplied by a relatively low-impedance useful signal source (for example, with Ri »1 ⁇ ), can thus be detected and recorded by the respective receiving circuit of the modem.
  • the useful signal can be transmitted at the resonance frequency of said bandpass filter or outside this resonance frequency.
  • the voltage of the useful signal drops in the impedance maximum of the bandpass filter at this and can be easily recognized and processed in the receiving circuit of the modem.
  • the useful signal since it is emitted by a relatively low-impedance useful signal source whose internal resistance is at least small compared with the internal resistance of the respective relatively high-impedance interference signal source, is readily recognized in the receiving circuit of the modem and also processed. In this case, even in the respective receiving circuit of the modem, a useful signal is detected and evaluated, if this is superimposed on a noise signal at the same frequency from a relatively high-impedance noise source.
  • the bandpass filter is expediently formed by an LC parallel circuit, which is capacitively coupled to the receiving branch of the modem.
  • the LC parallel circuit of the bandpass filter has an ohmic resistor in parallel, and the end of the bandpass filter facing away from the transceiver branch and the said ohmic resistor is supplied with a direct voltage defining the operating point of the receiver circuit.
  • DC voltage is preferably a tap of a between a supply voltage and a reference potential, in particular ground potential lying ohmic voltage divider. This results in the advantage of a particularly simple provision of the mentioned DC voltage.
  • a particularly favorable circuit structure results from the fact that the bandpass filter with its end remote from the end connected to a signal input terminal of the receiving circuit is connected to a reference potential, in particular ground potential, via a capacitor and an ohmic resistor arranged in series therewith.
  • Unnecessary connections of the mentioned IC chip to set to a defined potential can proceed so that the respective connections by so-called pull-up resistors or pull-down resistors each to a be ⁇ true potential, such as the supply voltage potential or Ground potential or even be connected directly to ground of the circuit arrangement.
  • a domestic appliance HG is schematically indicated, which signals with a Schal ⁇ for suppressing interference signals in the receiving branch of a transmission branch and the reception branch containing modem MO one with a Sende ⁇ device for the delivery and a receiving device for receiving ⁇ signals equipped household appliance HG is equipped.
  • the household appliance HG in question may be any mains-capable domestic appliance, such as a washing machine, a dryer, a stove, a refrigerator, a heating system, etc.
  • a domestic appliance which can be networked here is understood to be a household appliance which can be connected to a communications network for transmitting the most diverse data signals by means of a transmitting and / or receiving device.
  • this communication network comprises the AC voltage network, from which the supply voltages required for the operation of the respective domestic appliance are obtained.
  • any other network such as the Internet.
  • the circuit arrangement illustrated in the drawing contains the modem MO having a transmission branch and a reception branch, which in the present case is shown as containing a transmission module or a transmission circuit SB and a reception module or a reception circuit EB.
  • These components or circuits SB and EB can be a combined commercial transceiver module (for example, the ST7538 ST7538 power line FSK transmission and reception module from STMicroelectronics mentioned in the introduction - see Ver publication of this company from June 2003).
  • the modem MO just mentioned has a control device ST connected to it, which belongs to a transmitting device and a receiving device of the circuit arrangement.
  • the transmitting device of the relevant circuit arrangement comprises, in addition to the control device ST, for example one or more sensors S present in the domestic appliance H for determining one or more state parameters of the domestic appliance HG and a memory M in which data signals in the form of Condition signals and / or work programs of the relevant household appliance HG can be till ⁇ stores.
  • the receiving device of the relevant circuit arrangement comprises, in addition to the control device ST, for example, one or more actuators SG, a display device D, such as an LCD display device, and the previously mentioned memory M.
  • the relevant actuators SG in the mentioned reception branch, data signals can be obtained be delivered;
  • data signals transmitted in the reception branch can be stored in the mentioned memory M and displayed by the display device D.
  • the data signals transmitted in the reception branch may be, for example, test signals in the course of the execution of remote diagnostics or new work programs or parts thereof for updating the work programs of the household appliance HG stored in the mentioned memory M.
  • a transformer T with a winding w1 and a capacitor C1 is connected.
  • the transformer T has a further winding w2 which is connected on the one hand via a capacitor C2 to a connection x1 and on the other hand directly to a connection x2 of the illustrated circuit arrangement.
  • the two windings w1 and w2 of the transformer T can have a turn ratio of 1: 1. With the terminals x1, x2 is or the above-mentioned communication network is connected.
  • the circuit part comprising the just-mentioned connection part represents a transmission branch and a reception branch of the modem MO - according to the present invention, a bandpass filter BP capacitively, namely via a coupling capacitor C3 connected.
  • the bandpass filter BP comprises in the present FaII an LC parallel circuit consisting of an inductance, such as a coil L1, and a capacitive element, such as a capacitor C4.
  • This LC parallel circuit (L1, C4), whose resonant frequency can be set, for example, to 140 kHz, ie to the upper frequency of the CENELEC band C, lies in this case via a capacitor C5 and an ohmic resistor R1 connected in series therewith at a reference potential, preferably at ground potential.
  • the connection point between the mentioned coupling capacitor C3 and the bandpass filter BP is connected to the already mentioned signal input terminal E1 of the receiving module EB.
  • the relevant bandpass filter BP is thus not in the supply path, but in the derivation path of the relevant reception branch of the receiving block or the receiving circuit EB of the modem MO - it is thus parallel to the input circuit of the receiving branch or the reception circuit of the receiving module EB of the modem MO.
  • the above-mentioned LC parallel circuit consisting of the coil L1 and the capacitor C4, in the present case, an ohmic resistor R4 is connected in parallel, via which the receiving module EB of the modem MO is a the operating point of beff ⁇ fenden receiving module EB defining DC voltage can be supplied ,
  • This DC voltage is provided in the present case by tapping off an ohmic voltage divider, consisting of the ohmic resistors R2 and R3, which between a supply voltage of e.g. 5V leading terminal U and a Massepoten ⁇ tial leading terminal lie.
  • the aforementioned ohmic resistor R4 for supplying the DC voltage which defines the operating point of the receiving module EB or of a receiving circuit of the modem MO forming the latter has a certain effect on the low-pass filter BP used according to the invention.
  • the operating point of the receiving module EB can be placed in a desired range;
  • the relevant operating point can for example be placed at a point in the middle between the supply voltage at terminal U and ground, which is particularly desirable with respect to a Ausberichtle the receiving block EB Nutz ⁇ by signals, for example, with a zero level extending positive and negative Nutzsignalpegelan turnover occur.
  • the above-described construction of the circuit arrangement shown in the drawing according to an embodiment of the present invention ensures that interference signals from relatively high-impedance interference signal sources in the reception branch of the modem MO are effectively suppressed.
  • the band-pass filter BP used in the circuit arrangement in question permits impedance becoming smaller on both sides of its resonant frequency - for the CENELEC band C, however, only the band-pass filter range below the resonant frequency in question is available for the bandpass filter BP at a resonance frequency of 140 kHz Exploited band C - that only each of the useful signal received by a low-impedance useful signal source at the input terminal E1 of the receiving module EB of the modem MO comes into play, while interference from relatively high-impedance interfering signal sources (see above) by the relevant Bandpass ⁇ filter BP are so strongly attenuated due to its low impedance in the interference signal frequency ranges that they can no longer exert any disturbing effect on the reception module EB of the modem MO; the respective interference voltages collapse to a certain extent due to the low impedance thus imparted to the input terminal E1 of the receiving module EB by the relevant bandpass filter BP and can no longer disturb the reception of the useful signal by the receiving module EB.
  • the immunity of the modem MO is increased or its accessibility for useful signals in a disturbed environment in a simple manner, namely improved by the use of a few discrete components.
  • the EN 61000-4-4 standard can be easily complied with with regard to fast pulse-shaped burst signals.
  • the useful signals which, as mentioned above, are usually transmitted by relatively low-impedance useful signal sources (with, for example, Ri »1 ⁇ ) and via relatively low-resistance transmission paths (with, for example, Rt ⁇ 1k ⁇ ), are, however, well recognized in the receiving module EB of the modem MO , This is true even in the event that the Nutz ⁇ receive frequency and a Störsignalfrequenz are the same.
  • the present invention is of course also applicable to a circuit arrangement in which interference signals originating from relatively high-impedance interfering signal sources which occur within or outside a useful signal receiving frequency range are to be suppressed, which comprises a plurality of useful signal frequencies lying in a contiguous frequency range or in different frequency subranges.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Selective Calling Equipment (AREA)
  • Filters And Equalizers (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Noise Elimination (AREA)

Abstract

La présente invention concerne un procédé pour supprimer des signaux parasites dans l'embranchement de réception d'un modem (MO) présentant un embranchement d'émission et ledit embranchement de réception, qui fait partie d'un appareil ménager (HG) équipé d'un système d'émission permettant d'émettre des signaux de données et d'un système de réception permettant de recevoir des signaux de données. Selon cette invention, lorsque l'on met en oeuvre un circuit de réception (EB) du modem (MO) avec un circuit d'entrée présentant une impédance d'entrée relativement élevée, un filtre passe-bande (BP) est connecté en parallèle à ce circuit d'entrée. La fréquence de résonance de ce filtre passe-bande est fixée à une valeur telle que la fréquence de chaque signal parasite est soit supérieure, soit inférieure à cette fréquence de résonance.
EP05773841A 2004-08-11 2005-08-01 Circuit pour supprimer des signaux parasites dans l'embranchement de reception d'un modem d'un appareil menager Withdrawn EP1779645A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004039061A DE102004039061A1 (de) 2004-08-11 2004-08-11 Schaltungsanordnung zur Unterdrückung von Störsignalen im Empfangszweig eines Modems eines Hausgerätes
PCT/EP2005/053743 WO2006018376A2 (fr) 2004-08-11 2005-08-01 Circuit pour supprimer des signaux parasites dans l'embranchement de reception d'un modem d'un appareil menager

Publications (1)

Publication Number Publication Date
EP1779645A2 true EP1779645A2 (fr) 2007-05-02

Family

ID=35613771

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05773841A Withdrawn EP1779645A2 (fr) 2004-08-11 2005-08-01 Circuit pour supprimer des signaux parasites dans l'embranchement de reception d'un modem d'un appareil menager

Country Status (6)

Country Link
US (1) US20080089492A1 (fr)
EP (1) EP1779645A2 (fr)
KR (1) KR20070044435A (fr)
CN (1) CN101002459A (fr)
DE (1) DE102004039061A1 (fr)
WO (1) WO2006018376A2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8472576B2 (en) * 2008-06-06 2013-06-25 Maxim Integrated Products, Inc. Jammer canceller for power-line communication
DE102010023111A1 (de) * 2010-06-04 2011-12-08 Erich Griesmayer Verfahren zum Ein- und Auskoppeln von Signalen bzw. Daten in ein bzw. aus einem elektrischen Energienetz
CN103812528B (zh) * 2014-03-03 2016-06-01 杭州再灵电子科技有限公司 一种直流载波电路
US9148320B1 (en) * 2014-09-29 2015-09-29 Landis+Gyr Technologies, Llc Transceiver front-end for communication over power lines

Family Cites Families (12)

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Publication number Priority date Publication date Assignee Title
US3743938A (en) * 1971-08-10 1973-07-03 Gen Datacomm Ind Inc Closed data loop test apparatus for data transmission modem
US4443662A (en) * 1981-04-10 1984-04-17 Northern Telecom Limited Filters comprising reactive components, and a method of determining impedances thereof
GB2209648B (en) * 1987-09-10 1991-10-23 Ncr Co Modem communication system having main and secondary channels
US5179302A (en) * 1991-04-03 1993-01-12 Loral Aerospace Corp. Tunable data filter
DE4418296A1 (de) * 1994-05-26 1995-11-30 Abb Patent Gmbh Netzankopplung für Einrichtungen zur Datenübertragung über ein elektrisches Verteilnetz
FR2737623A1 (fr) * 1995-08-02 1997-02-07 Philips Electronics Nv Systeme de telecommunication au travers de lignes d'alimentation d'energie
SG55257A1 (en) * 1996-12-30 1998-12-21 Koninkl Philips Electronics Nv Receiver with a turnable parallel resontant circuit
US6690719B1 (en) * 2000-02-14 2004-02-10 Itran Communications Ltd. Host to modem interface
US6396392B1 (en) * 2000-05-23 2002-05-28 Wire21, Inc. High frequency network communications over various lines
US6608536B2 (en) * 2000-11-09 2003-08-19 Broadcom Corporation Constant impedance filter
US6590493B1 (en) * 2000-12-05 2003-07-08 Nortel Networks Limited System, device, and method for isolating signaling environments in a power line communication system
DE102004034328A1 (de) * 2004-07-15 2006-02-02 BSH Bosch und Siemens Hausgeräte GmbH Schaltungsanordnung zur Unterdrückung von Störsignalen in von einem Modem eines Hausgerätes abgegebenen Sendesignalen

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See references of WO2006018376A2 *

Also Published As

Publication number Publication date
CN101002459A (zh) 2007-07-18
WO2006018376A3 (fr) 2006-07-27
DE102004039061A1 (de) 2006-02-23
WO2006018376A2 (fr) 2006-02-23
KR20070044435A (ko) 2007-04-27
US20080089492A1 (en) 2008-04-17

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