GB2047507A - Signalling over power lines - Google Patents

Signalling over power lines Download PDF

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Publication number
GB2047507A
GB2047507A GB8011877A GB8011877A GB2047507A GB 2047507 A GB2047507 A GB 2047507A GB 8011877 A GB8011877 A GB 8011877A GB 8011877 A GB8011877 A GB 8011877A GB 2047507 A GB2047507 A GB 2047507A
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GB
United Kingdom
Prior art keywords
sender
signal
detectors
receiver
pulse
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
GB8011877A
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GB2047507B (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.)
ASKEW P
Original Assignee
ASKEW P
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 ASKEW P filed Critical ASKEW P
Priority to GB8011877A priority Critical patent/GB2047507B/en
Publication of GB2047507A publication Critical patent/GB2047507A/en
Application granted granted Critical
Publication of GB2047507B publication Critical patent/GB2047507B/en
Expired legal-status Critical Current

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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
    • H04B2203/5429—Applications for powerline communications
    • H04B2203/5458—Monitor sensor; Alarm systems

Abstract

A communication means includes at least one sender connected to a normal mains electricity circuit and normally transmitting pulses along the circuit and a receiver also connected to the mains circuit and including means for sensing the omission of pulses unique to a particular sender such that it can indicate a change in the state of that particular sender, for example when the sender has detected smoke in its locality.

Description

SPECIFICATION Improvements in or relating to communication means The present invention concerns an improved means of communication. The means of communication of the invention is intended for use in domestic, office and larger scale industrial applications.
Numerous devices are known for detecting and transmitting information, for example smoke detectors, intruder detectors, gas detectors, heat detectors, pressure detectors. In most applications several detectors are employed, for example a suite of offices comprising several rooms may have smoke detectors in each room. Normally the detectors are connected by an independent wiring circuit to a control or display panel in one room such that information from all the detectors can be displayed at a central installation.
In view of the fact that independent wiring system is required such an arrangement is expensive and time consuming to instal.
It is an object of the present invention to obviate or mitigate these disadvantages.
According to the present invention there is provided a communication means including a sender adapted to transmit a signal on detecting certain information, means for connecting said sender to an existing electricity supply circuit, and a receiver at a location remote from the sender connectible to the supply circuit and including means for detecting a signal in the supply circuit transmitted by the sender and reacting to said signal.
Preferably the sender includes a unit which produces a pulse every half cycle or full cycle of the alternating current of the said circuit.
Preferably the sender includes a unit which leaks current to earth to provide said signal.
Preferably the receiver includes a differential current transformer which is unbalanced by the signal from the sender and means are provided to detect the unbalance, and produce a response in accordance with the unbalance.
Preferably the unbalance is due to the omission or change in position of at least one pulse from a normal cycle of pulses.
An embodiment of the present invention will now be described by way of example only.
A suite of offices has an intruder detector in each room and a central display panel at a convenient location, for example, in the reception area, which indicates if any one or more of the rooms has been entered. Thus means are required to connect each detector with the central display panel and the present invention utilises the existing mains circuit for the office.
Each detector includes a sender which is connected to the line and neutral wires of the mains circuit and means are provided in the sender for leaking the mains current, in normal conditions to cause constant pulses.
Where a signal has to be transmitted the sender ceases to transmit its pulse.
A receiver operates in conjunction with the central display panel and is also connected to the line and neutral of the mains circuit. It includes a differential current transformer coupled to the line and neutral and is coupled also on its secondary side to circuitry which senses the secondary current, or more especially the omission of pulses in the secondary current resulting from the termination of pulse transmission by a particular sender or senders.
The receiver can detect the particular pulse or pulses omitted as they are transmitted by the senders in timed relationship to each other and since this will be unique for each sender can cause an indication, for example a lamp to be activated to indicate that a particular sender is transmitting, that is that a room has been entered.
It will be realised that a plurality of electronic means can be employed for the senaers and for the receiver and since these do not form part of the present invention they will not be described here.
The present invention is advantageous in that as it utilises the omission of pulses it is not affected by interference, from outside sources, in the mains. It is to be appreciated that the invention may be utilised with other than mains supply circuits, for example with supply circuits in ships, etc.
1. A communication means including a sender adapted to transmit a signal on detecting certain information, means for connecting said sender to an existing electricity supply circuit, and a receiver at a location remote from the sender connectible to the supply circuit and including means for detecting a signal in the supply circuit transmitted by the sender and reacting to said signal.
2. A communication means as claimed in claim 1, in which the sender includes a unit which produces a pulse every half cycle or full cycle of the alternating current of the supply circuit.
3. A communication means as claimed in claim 2, in which the sender includes a unit which leaks current to earth.to provide said signal.
4. A communication means as claimed in claim 3, in which the receiver includes a differential current transformer which is unbalanced by the signal from the sender and means are provided to detect the unbalance, and produce a response in accordance with the unbalance.
5. A communication means as claimed in claim 4, in which the unbalance is due to the omission or change in position of at least one
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (7)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Improvements in or relating to communication means The present invention concerns an improved means of communication. The means of communication of the invention is intended for use in domestic, office and larger scale industrial applications. Numerous devices are known for detecting and transmitting information, for example smoke detectors, intruder detectors, gas detectors, heat detectors, pressure detectors. In most applications several detectors are employed, for example a suite of offices comprising several rooms may have smoke detectors in each room. Normally the detectors are connected by an independent wiring circuit to a control or display panel in one room such that information from all the detectors can be displayed at a central installation. In view of the fact that independent wiring system is required such an arrangement is expensive and time consuming to instal. It is an object of the present invention to obviate or mitigate these disadvantages. According to the present invention there is provided a communication means including a sender adapted to transmit a signal on detecting certain information, means for connecting said sender to an existing electricity supply circuit, and a receiver at a location remote from the sender connectible to the supply circuit and including means for detecting a signal in the supply circuit transmitted by the sender and reacting to said signal. Preferably the sender includes a unit which produces a pulse every half cycle or full cycle of the alternating current of the said circuit. Preferably the sender includes a unit which leaks current to earth to provide said signal. Preferably the receiver includes a differential current transformer which is unbalanced by the signal from the sender and means are provided to detect the unbalance, and produce a response in accordance with the unbalance. Preferably the unbalance is due to the omission or change in position of at least one pulse from a normal cycle of pulses. An embodiment of the present invention will now be described by way of example only. A suite of offices has an intruder detector in each room and a central display panel at a convenient location, for example, in the reception area, which indicates if any one or more of the rooms has been entered. Thus means are required to connect each detector with the central display panel and the present invention utilises the existing mains circuit for the office. Each detector includes a sender which is connected to the line and neutral wires of the mains circuit and means are provided in the sender for leaking the mains current, in normal conditions to cause constant pulses. Where a signal has to be transmitted the sender ceases to transmit its pulse. A receiver operates in conjunction with the central display panel and is also connected to the line and neutral of the mains circuit. It includes a differential current transformer coupled to the line and neutral and is coupled also on its secondary side to circuitry which senses the secondary current, or more especially the omission of pulses in the secondary current resulting from the termination of pulse transmission by a particular sender or senders. The receiver can detect the particular pulse or pulses omitted as they are transmitted by the senders in timed relationship to each other and since this will be unique for each sender can cause an indication, for example a lamp to be activated to indicate that a particular sender is transmitting, that is that a room has been entered. It will be realised that a plurality of electronic means can be employed for the senaers and for the receiver and since these do not form part of the present invention they will not be described here. The present invention is advantageous in that as it utilises the omission of pulses it is not affected by interference, from outside sources, in the mains. It is to be appreciated that the invention may be utilised with other than mains supply circuits, for example with supply circuits in ships, etc. CLAIMS
1. A communication means including a sender adapted to transmit a signal on detecting certain information, means for connecting said sender to an existing electricity supply circuit, and a receiver at a location remote from the sender connectible to the supply circuit and including means for detecting a signal in the supply circuit transmitted by the sender and reacting to said signal.
2. A communication means as claimed in claim 1, in which the sender includes a unit which produces a pulse every half cycle or full cycle of the alternating current of the supply circuit.
3. A communication means as claimed in claim 2, in which the sender includes a unit which leaks current to earth.to provide said signal.
4. A communication means as claimed in claim 3, in which the receiver includes a differential current transformer which is unbalanced by the signal from the sender and means are provided to detect the unbalance, and produce a response in accordance with the unbalance.
5. A communication means as claimed in claim 4, in which the unbalance is due to the omission or change in position of at least one pulse from a normal cycle of pulses.
6. A communication means substantially as hereinbefore described.
7. Any novel subject matter or combination including novel subject matter herein disclosed, whether or not within the scope of or relating to the same invention as any of the preceding claims.
GB8011877A 1979-04-11 1980-04-10 Signalling over power lines Expired GB2047507B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8011877A GB2047507B (en) 1979-04-11 1980-04-10 Signalling over power lines

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7912791 1979-04-11
GB8011877A GB2047507B (en) 1979-04-11 1980-04-10 Signalling over power lines

Publications (2)

Publication Number Publication Date
GB2047507A true GB2047507A (en) 1980-11-26
GB2047507B GB2047507B (en) 1983-12-14

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB8011877A Expired GB2047507B (en) 1979-04-11 1980-04-10 Signalling over power lines

Country Status (1)

Country Link
GB (1) GB2047507B (en)

Cited By (3)

* 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
US4916432A (en) * 1987-10-21 1990-04-10 Pittway Corporation Smoke and fire detection system communication
FR2652666A1 (en) * 1989-10-03 1991-04-05 Delta Dore System for transmitting a signalling signal by the electricity mains and security system using this transmission system

Cited By (3)

* 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
US4916432A (en) * 1987-10-21 1990-04-10 Pittway Corporation Smoke and fire detection system communication
FR2652666A1 (en) * 1989-10-03 1991-04-05 Delta Dore System for transmitting a signalling signal by the electricity mains and security system using this transmission system

Also Published As

Publication number Publication date
GB2047507B (en) 1983-12-14

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Legal Events

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