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GB2088175A - Signal Transmission Over Power Lines - Google Patents

Signal Transmission Over Power Lines Download PDF

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Publication number
GB2088175A
GB2088175A GB8014613A GB8014613A GB2088175A GB 2088175 A GB2088175 A GB 2088175A GB 8014613 A GB8014613 A GB 8014613A GB 8014613 A GB8014613 A GB 8014613A GB 2088175 A GB2088175 A GB 2088175A
Authority
GB
United Kingdom
Prior art keywords
transmitter
receiver
khz
frequency
operate
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.)
Granted
Application number
GB8014613A
Other versions
GB2088175B (en
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.)
BLIGH ELECTRICAL S W Ltd
Original Assignee
BLIGH ELECTRICAL S W Ltd
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 BLIGH ELECTRICAL S W Ltd filed Critical BLIGH ELECTRICAL S W Ltd
Priority to GB8014613A priority Critical patent/GB2088175B/en
Publication of GB2088175A publication Critical patent/GB2088175A/en
Application granted granted Critical
Publication of GB2088175B publication Critical patent/GB2088175B/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • H04B2203/5416—Methods of transmitting or receiving signals via power distribution lines by adding signals to the wave form of the power source
    • 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
    • H04B2203/5429—Applications for powerline communications
    • H04B2203/545—Audio/video application, e.g. interphone
    • 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
    • H04B2203/5429—Applications for powerline communications
    • H04B2203/5458—Monitor sensor; Alarm systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Alarm Systems (AREA)

Abstract

An electrical signal transmission system comprising a transmitter 10 and a receiver 11 connected across the neutral N and earth E leads of a mains supply. Transmitter 10 and receiver 11 are arranged to operate at a frequency in the range of 50KHz to 100KHz, ideally around 60KHz. The transmission system may be used as an alarm device in which a sensor or monitor S1 actuates a timer 12 to operate transmitter 10 for a predetermined duration. <IMAGE>

Description

SPECIFICATION Improvements in and Relating to Electrical Signal Transmission Systems The invention relates to electrical signal transmission systems for transmitting and receiving signals utilising mains electrical supply wiring within localised areas.
Such systems which have been utilised in the past have been arranged to be connected between the live and neutral leads of the mains supply. These prior systems have been subject to interference from mains transients and can be hazardous.
According to one aspect of the invention there is provided a method of transmitting an electrical signal along electrical mains supply wiring which comprises connecting a transmitter across the neutral and earth leads of a mains supply, connecting a receiver across the neutral and earth leads of the same mains supply and transmitting a signal of a frequency between 50 KHz and 100 KHz from the transmitter to be received by the receiver.
Preferably the signal is transmitted at a frequency of the order of 60 KHz.
According to a further aspect of the invention there is provided an electrical signal transmission system comprising a transmitter and a receiver, both adapted to be connected between the neutral and earth leads of an electrical mains supply, the transmitter and receiver being arranged to operate at a frequency in the range 50 KHz to 100 KHz.
The transmitter and receiver are preferably arranged to operate at a frequency in the order of 60 KHz.
The transmitter may comprise a voltage controlled oscillator arranged to generate a square wave output and may be connected to the mains leads via a buffer amplifier.
The receiver may include a frequency decoder as a phase loop detector.
The transmitter and receiver may be arranged to operate with frequency modulated signals.
An alarm system may include a transmission system as disclosed in the next preceding five paragraphs, wherein a sensor or monitoring device is arranged to actuate the transmitter and the receiver is connected to actuate an alarm device.
With such an alarm system the sensor or monitoring device may be connected to actuate a timer device which is connected to the transmitter to operate such transmitter for a predetermined duration.
The foregoing and further features of the invention may be more readily understood from the following description of a preferred embodiment thereof, by way of example, with reference to the accompanying drawing, which is a block schematic representation of an electrical signal transmission system incorporated into an alarm system.
Referring now to the drawing, there is shown an electrical signal transmission system comprising a transmitter 10 and a receiver 11 each connected across the earth E and neutral N leads of an electrical mains supply.
The transmitter 10 comprises a commercially available function generator integrated circuit operated as a voltage controlled oscillator which generates a square wave output. The output from transmitter 10 is shown directly connected to the earth E and neutral N leads of the supply but may be connected via a buffer amplifier when larger transmission distances are required.
The receiver 11 comprises a commercially available frequency decoder integrated circuit as a phase lock loop detector.
Both the transmitter 10 and receiver 11 are arranged to operate at a frequency between 50 KHz and 100 KHz. By experimentation it has been found that utilising a frequency below 50 KHz causes attenuation problems and interference from transients, and utilising a frequency above 100 KHz causes problems from radio interference. The ideal frequency for use with the system has been found to be around 60 KHz.
The transmission system is ideally suited for use with an alarm system and as shown in the drawing switch S1 represents a monitor or sensor connected to complete an energisation path for a timer 12. When energised the timer actuates the transmitter 10 which transmits a signal for a predetermined duration. Upon receipt of the signal receiver 11 locks on and its output is utilised to operate a relay or other alarm device.
The alarm system is suitable for use as a protection device, for example, for a cold store or freezer cabinets. In such use the sensor would comprise a temperature sensor so that when the store or cabinet temperature reaches a predetermined temperature an alarm is indicated.
An alternative use would be for an elderly person who could operate switch S1 when requiring assistance to operate an alarm in another part of a large building or hospital or in a nearby house where the receiver is located.
Both transmitter 10 and receiver 11 can be provided as a plug-in unit which can merely be plugged into a normal mains supply socket to provide the required connections to the earth and neutral leads. Hence an alarm or other localised signal transmission system can be installed without the requirement of any additional wiring other than that already provided for mains supply.
In other uses of the system the transmitter 10 and receiver 11 could be arranged to operate with frequency modulated signals to provide speech transmission/reception or for data transmission via computers.
Clearly a number of transmitters 10 could be utilised to send to a single or a number of receivers 11.
Claims
1. A method of transmitting an electrical signal along electrical mains supply wiring which comprises connecting a transmitter across the
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (11)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Improvements in and Relating to Electrical Signal Transmission Systems The invention relates to electrical signal transmission systems for transmitting and receiving signals utilising mains electrical supply wiring within localised areas. Such systems which have been utilised in the past have been arranged to be connected between the live and neutral leads of the mains supply. These prior systems have been subject to interference from mains transients and can be hazardous. According to one aspect of the invention there is provided a method of transmitting an electrical signal along electrical mains supply wiring which comprises connecting a transmitter across the neutral and earth leads of a mains supply, connecting a receiver across the neutral and earth leads of the same mains supply and transmitting a signal of a frequency between 50 KHz and 100 KHz from the transmitter to be received by the receiver. Preferably the signal is transmitted at a frequency of the order of 60 KHz. According to a further aspect of the invention there is provided an electrical signal transmission system comprising a transmitter and a receiver, both adapted to be connected between the neutral and earth leads of an electrical mains supply, the transmitter and receiver being arranged to operate at a frequency in the range 50 KHz to 100 KHz. The transmitter and receiver are preferably arranged to operate at a frequency in the order of 60 KHz. The transmitter may comprise a voltage controlled oscillator arranged to generate a square wave output and may be connected to the mains leads via a buffer amplifier. The receiver may include a frequency decoder as a phase loop detector. The transmitter and receiver may be arranged to operate with frequency modulated signals. An alarm system may include a transmission system as disclosed in the next preceding five paragraphs, wherein a sensor or monitoring device is arranged to actuate the transmitter and the receiver is connected to actuate an alarm device. With such an alarm system the sensor or monitoring device may be connected to actuate a timer device which is connected to the transmitter to operate such transmitter for a predetermined duration. The foregoing and further features of the invention may be more readily understood from the following description of a preferred embodiment thereof, by way of example, with reference to the accompanying drawing, which is a block schematic representation of an electrical signal transmission system incorporated into an alarm system. Referring now to the drawing, there is shown an electrical signal transmission system comprising a transmitter 10 and a receiver 11 each connected across the earth E and neutral N leads of an electrical mains supply. The transmitter 10 comprises a commercially available function generator integrated circuit operated as a voltage controlled oscillator which generates a square wave output. The output from transmitter 10 is shown directly connected to the earth E and neutral N leads of the supply but may be connected via a buffer amplifier when larger transmission distances are required. The receiver 11 comprises a commercially available frequency decoder integrated circuit as a phase lock loop detector. Both the transmitter 10 and receiver 11 are arranged to operate at a frequency between 50 KHz and 100 KHz. By experimentation it has been found that utilising a frequency below 50 KHz causes attenuation problems and interference from transients, and utilising a frequency above 100 KHz causes problems from radio interference. The ideal frequency for use with the system has been found to be around 60 KHz. The transmission system is ideally suited for use with an alarm system and as shown in the drawing switch S1 represents a monitor or sensor connected to complete an energisation path for a timer 12. When energised the timer actuates the transmitter 10 which transmits a signal for a predetermined duration. Upon receipt of the signal receiver 11 locks on and its output is utilised to operate a relay or other alarm device. The alarm system is suitable for use as a protection device, for example, for a cold store or freezer cabinets. In such use the sensor would comprise a temperature sensor so that when the store or cabinet temperature reaches a predetermined temperature an alarm is indicated. An alternative use would be for an elderly person who could operate switch S1 when requiring assistance to operate an alarm in another part of a large building or hospital or in a nearby house where the receiver is located. Both transmitter 10 and receiver 11 can be provided as a plug-in unit which can merely be plugged into a normal mains supply socket to provide the required connections to the earth and neutral leads. Hence an alarm or other localised signal transmission system can be installed without the requirement of any additional wiring other than that already provided for mains supply. In other uses of the system the transmitter 10 and receiver 11 could be arranged to operate with frequency modulated signals to provide speech transmission/reception or for data transmission via computers. Clearly a number of transmitters 10 could be utilised to send to a single or a number of receivers 11. Claims
1. A method of transmitting an electrical signal along electrical mains supply wiring which comprises connecting a transmitter across the neutral and earth leads of a mains supply, connecting a receiver across the neutral and earth leads of the same mains supply and transmitting a signal of a frequency between 50 KHz and 100 KHz from the transmitter to be received by the receiver.
2. A method as claimed in claim 1 wherein the signal is transmitter at a frequency of the order of 60 KHz.
3. An electrical signal transmission system comprising a transmitter and a receiver, both adapted to be connected between the neutral and earth leads of an electrical mains supply, the transmitter and receiver being arranged to operate at a frequency in the range of 50 KHz to 100 KHz.
4. An electrical signal transmission system as claimed in claim 3 wherein the transmitter and receiver are arranged to operate at a frequency of the order of 60 KHz.
5. An electrical signal transmission system as claimed in claim 3 or 4 wherein the transmitter comprises a voltage controlled oscillator arranged to generate a square wave output.
6. An electrical signal transmission system as claimed in claim 5 wherein the transmitter is arranged to be connected to the mains leads via a buffer amplifier.
7. An electrical signal transmission system as claimed in any one of claims 3 to 6 inclusive wherein the receiver includes a frequency decoder as a phase lock loop detector
8. An electrical signal transmission system as claimed in claim 3 or 4 wherein the transmitter and receiver are arranged to respectively produce and receive frequency modulated signals.
9. An alarm system including an electrical signal transmission system as claimed in any one of claims 3 to 8 inclusive wherein a sensor or monitoring device is arranged to actuate the transmitter and the receiver is connected to actuate an alarm device.
10. An alarm system as claimed in claim 9 wherein the sensor or monitoring device is connected to actuate a timer device which is connected to the transmitter to operate such transmitter for a predetermined duration.
11. An alarm system substantially as hereinbefore described with reference to the accompanying drawing.
GB8014613A 1980-05-02 1980-05-02 Signal transmission over power lines Expired GB2088175B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8014613A GB2088175B (en) 1980-05-02 1980-05-02 Signal transmission over power lines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8014613A GB2088175B (en) 1980-05-02 1980-05-02 Signal transmission over power lines

Publications (2)

Publication Number Publication Date
GB2088175A true GB2088175A (en) 1982-06-03
GB2088175B GB2088175B (en) 1984-10-03

Family

ID=10513169

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8014613A Expired GB2088175B (en) 1980-05-02 1980-05-02 Signal transmission over power lines

Country Status (1)

Country Link
GB (1) GB2088175B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2151116A (en) * 1983-12-07 1985-07-10 Lamont David Gordon Signalling over power lines
DE3439789A1 (en) * 1984-10-31 1986-05-07 Brown, Boveri & Cie Ag, 6800 Mannheim METHOD FOR REDUCING THE LOAD ON A TRANSMITTER CIRCUIT BY RECEIVING CIRCUIT OF SEVERAL TRANSMITTER / RECEIVER DEVICES AND CIRCUIT ARRANGEMENT FOR IMPLEMENTING THE METHOD
GB2342264A (en) * 1998-08-04 2000-04-05 Nor Web Dpl Limited Signal transmission over power networks
WO2001041316A3 (en) * 1999-11-30 2001-12-06 Schleifring Und Appbau Gmbh System for transmitting electric signals between moving parts with a reduced number of paths
FR2843254A1 (en) * 2002-08-01 2004-02-06 Pierre Noel Guy Barre Modem/electrical distribution network connection mechanism having HF modulated signals branching wires connected with capacitor neutral coupled and high/band pass filter connected conductor plane/neutral.

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2151116A (en) * 1983-12-07 1985-07-10 Lamont David Gordon Signalling over power lines
DE3439789A1 (en) * 1984-10-31 1986-05-07 Brown, Boveri & Cie Ag, 6800 Mannheim METHOD FOR REDUCING THE LOAD ON A TRANSMITTER CIRCUIT BY RECEIVING CIRCUIT OF SEVERAL TRANSMITTER / RECEIVER DEVICES AND CIRCUIT ARRANGEMENT FOR IMPLEMENTING THE METHOD
WO1986002794A1 (en) * 1984-10-31 1986-05-09 Brown, Boveri & Cie Aktiengesellschaft Process for reducing the loading of a transmission circuit by the receiving circuit of several transmission/receiving sets, and a circuit arrangement for realisation of the process
GB2342264A (en) * 1998-08-04 2000-04-05 Nor Web Dpl Limited Signal transmission over power networks
GB2342264B (en) * 1998-08-04 2001-05-02 Nor Web Dpl Ltd Power networks
WO2001041316A3 (en) * 1999-11-30 2001-12-06 Schleifring Und Appbau Gmbh System for transmitting electric signals between moving parts with a reduced number of paths
FR2843254A1 (en) * 2002-08-01 2004-02-06 Pierre Noel Guy Barre Modem/electrical distribution network connection mechanism having HF modulated signals branching wires connected with capacitor neutral coupled and high/band pass filter connected conductor plane/neutral.

Also Published As

Publication number Publication date
GB2088175B (en) 1984-10-03

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19940502