EP1834514B1 - Transfert de donnees sur cloture electrique - Google Patents
Transfert de donnees sur cloture electrique Download PDFInfo
- Publication number
- EP1834514B1 EP1834514B1 EP05856153A EP05856153A EP1834514B1 EP 1834514 B1 EP1834514 B1 EP 1834514B1 EP 05856153 A EP05856153 A EP 05856153A EP 05856153 A EP05856153 A EP 05856153A EP 1834514 B1 EP1834514 B1 EP 1834514B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pulses
- pulse
- energiser
- conductor
- train
- 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.)
- Ceased
Links
- 238000012546 transfer Methods 0.000 title description 6
- 238000000034 method Methods 0.000 claims description 17
- 239000004020 conductor Substances 0.000 claims description 12
- 238000009434 installation Methods 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims 1
- 239000003990 capacitor Substances 0.000 description 24
- 238000004891 communication Methods 0.000 description 12
- 238000004804 winding Methods 0.000 description 8
- 230000008901 benefit Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05C—ELECTRIC CIRCUITS OR APPARATUS SPECIALLY DESIGNED FOR USE IN EQUIPMENT FOR KILLING, STUNNING, OR GUIDING LIVING BEINGS
- H05C3/00—Other circuits or apparatus
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05C—ELECTRIC CIRCUITS OR APPARATUS SPECIALLY DESIGNED FOR USE IN EQUIPMENT FOR KILLING, STUNNING, OR GUIDING LIVING BEINGS
- H05C1/00—Circuits or apparatus for generating electric shock effects
- H05C1/04—Circuits or apparatus for generating electric shock effects providing pulse voltages
Definitions
- This invention relates generally to an electric fence and more particularly is concerned with the transfer of data along an electric fence for communication purposes.
- An electric fence may extend over a considerable distance and, at least in order to monitor the integrity of the fence and to detect intrusions, it is desirable to have the facility to communicate on the fence.
- US Patents Nos. 5420885 and 5651025 respectively describe the use of an additional pulse train or a carrier frequency which is superimposed on the fence wires apart from the energizing pulses.
- US Patent No. 6081198 describes a pulse density modulation technique.
- US Patent No. 6801045 describes a technique in which the fence (shock) pulses are modulated using pulse position principles. This can be effective but it suffers from the disadvantage that it is not possible to synchronise a number of individual energisers in the time domain. This is a requirement, for safety reasons, in adjacent fences which are separately energised by the respective energisers. A further disadvantage is the difficulty of excluding extraneous noise on the fence or fences using threshold detection.
- US Patents Nos. 4310869 , 5767592 , 6020658 and 4859868 describe energisers which produce unipolar output wave forms.
- An intention in this respect is to increase efficiency and possibly energy output and to reduce electromagnetic interference generated by the pulses.
- such energisers often monitor a return fence voltage in order to determine fence loading.
- the energy for generating the energising pulses is derived from a charged capacitor.
- the energy which is stored in a capacitor is proportional to the square of the voltage across the capacitor. Thus if an attempt is made to operate at a low load condition the fence voltage may be considerably reduced.
- the invention addresses at least some of the aforementioned problems.
- the invention provides, in the first instance, a method of transferring data along an electric fence according to claim 1, which includes at least one first elongate conductor, the method including the steps of energising the at least first conductor using a first train of pulses selected from a first unipolar pulse of a first polarity, a second unipolar pulse of a second polarity and bipolar pulses, and using predetermined pulses, selected from the first pulse train, to represent defined information.
- any technique or protocol may be used to associate the pulses with defined information.
- the information may be expressed in binary form with one or more defined pulses representing a logical zero and one or more defined pulses representing a logical one.
- the predetermined pulses may be sent in groups at predetermined spacing from each other or in predetermined sequences.
- Each group of pulses may be identified in any appropriate way. Thus the existence of pulses which are associated with data or information may be identified while other pulses, which are not so identified, do not represent data or information.
- An important aspect of the invention in this regard is the realisation that pulses which are used for energising the conductor can be selected from an available range of pulses in order to represent data while, at the same time, ensuring that the pulses comply with applicable safety regulations particularly in respect of energy per pulse and pulse repetition rates.
- the pulses or groups of pulses may be used in accordance with any defined protocol to represent data.
- the polarities of the pulses may be varied and bipolar pulses with positive and negative leading edges may be employed, according to requirement, to represent data e.g. a logical zero or a logical one.
- the method of the invention may be used with a single energiser or with a plurality of energisers.
- a single energiser may be used to transmit data to a controller or monitor.
- a first energiser can be used to transfer data, using the method of the invention which has been described, to a second energiser and the second energiser can be used to relay the information received from the first energiser and, at the same time, to transmit information from the second energiser.
- the transmission from the second energiser may be directed to a third energiser at which the aforementioned process can be repeated, or to a monitor or control unit.
- the invention also extends to an energiser according to claim 6 which includes a first generator for generating a first pulse of a first polarity, a second generator for generating a second pulse of a second polarity, and a control unit for controlling operation of the first and second generators.
- the control unit is such that, in respect of first and second adjacent time intervals, each of which is of a defined duration, a first pulse or a second pulse is generated in the first time interval and no pulse, a first pulse or a second pulse is generated in the second time interval.
- the energiser is therefore such that it can produce a pulse train with pulses selected from unipolar pulses of first and second polarities respectively and bipolar pulses with a positive leading edge and with a negative leading edge respectively.
- energisers are required to operate at prescribed pulse "amplitudes (energy content) and repetition rates and these objectives can be achieved in a plurality of manners which are known and which for this reason are not further described herein.
- FIG. 1 of the accompanying drawings illustrates a conventional energiser 10 used to electrify a fence, not shown.
- the energiser includes an energy device 12 such as a storage capacitor which is charged from a control circuit and which can be discharged by means of a switch 14, such as a silicon controlled rectifier, through a primary winding 16 of a step-up transformer 18.
- the transformer has a secondary winding 20 with terminals 22 which are connected, in known manner, to electrical conductors in a fence.
- the pulse train which is applied to the fence is determined by the circuit arrangement of the energiser and is not readily varied except, possibly, in accordance with timing information which is used to control the switch 14 and in respect of the amount of energy stored in the capacitor 12.
- FIG. 2 illustrates an energiser 24, according to a first form of the invention, which embodies what is referred to as a half bridge circuit.
- This circuit includes first and second energy storage capacitors 26 and 28 respectively which are connected in series with two SCR (silicon controlled rectifier) switches 30 and 32 respectively which are individually controllable by means of a control circuit 33.
- the switches are in parallel to diodes 34 and 36 which are used for control and protective purposes, as is known in the art.
- a primary winding 38 of a transformer 40 is connected between the junction point of the capacitors 26 and 28 on the one hand and via an inductor 41 to a junction point of the switches 30 and 32 on the other hand.
- a capacitor 42 used for protective and smoothing purposes, as is known in the art, is connected in parallel to the primary winding.
- a secondary winding 44 of the transformer is connected to the wires in an electric fence, not shown.
- FIG. 4A illustrates a positive unipolar pulse 45 which is produced by discharging the capacitor 26.
- Figure 4B shows a negative unipolar pulse 46 produced by discharging the capacitor 28.
- a bipolar pulse 47 with a positive leading portion, of the type shown in Figure 4C is produced.
- a bipolar pulse 48 with a negative leading portion, of the type shown in Figure 4D is however produced when the capacitor 28 is discharged first and the capacitor 26 is thereafter discharged.
- the control unit 33 controls the charging and discharging of the capacitors 26 and 28 using as control parameters information which is input relating to the unit from suitable sensors, not shown, relating to the operational aspects of the fence which are to be monitored, and in accordance with the type of communication protocol which is adopted.
- Figure 3 illustrates an energiser 50 according to a second form of the invention which is referred to herein as a full bridge circuit.
- Components which are used in the energiser 50 and which are the same as the corresponding components used in the energiser 24 bear like reference numerals.
- the energiser 50 includes two additional SCR switches designated 30A and 32A respectively which together with the SCR switches 30 and 32 make up a full bridge circuit.
- Two storage capacitors 52 and 52A are connected across the bridge and use is made of diodes 54 and 56, 34 and 36, and 34A and 36A, respectively, for protective, operative and control purposes.
- a positive unipolar pulse of the type shown in' Figure 4A can be generated by allowing the capacitor 52 to discharge through the switches 30A and 32.
- a negative unipolar pulse, of the type shown in Figure 4B is achieved by closing the switches 30 and 32A to cause discharge of the capacitor 52A .
- a positive bipolar pulse 47 of the type shown in Figure 4C can be achieved by the closure of the switches 30A and 32 followed by a timed closure of the switches 30 and 32A.
- the Figure 4D negative bipolar pulse can be achieved by closure of the switches 30 and 32A followed by a timed closure of the switches 30A and 32.
- Figure 5 illustrates a single energiser 60 which may include an energiser 24 of the kind shown in Figure 2 or an energiser 50 of the kind shown in Figure 3 .
- the secondary winding of the respective transformer is connected to fence wires which are symbolically represented and which are designated 62 and 64.
- a ground connection 66 to the transformer or energiser is also made.
- a receiver 68 is connected to the wires at a remote point.
- the receiver includes a detector 70 and a monitor 72.
- the detector 70 has an attenuator 76 and an analogue to digital converter 78.
- the attenuator reduces the voltage applied to the analogue to digital converter which samples the waveform on the fence wires and produces a train of digital pulses which are applied to the monitor and interpreted in accordance with a defined data transfer protocol.
- the detector can also be used to monitor one or more of the fence voltage, the fence current and the degree of electromagnetic interference generated through the use of the energiser.
- the detector can include a circuit or algorithm so that it only measures signals in a certain time window to exclude time interference from any extraneous source or any other fence.
- the monitor 72 is capable of detecting the pulse polarity and the current sequence. Assume that use is made of a communication protocol in which a positive leading edge bipolar fence pulse 47 from the energiser 60 indicates that the monitor 72 must synchronise its clock to that of a master clock so that the following fence pulse is then regarded as a known bit positioned in the data stream.
- the energiser 60 is considered as a master and it generates a bipolar pulse (47) with a positive edge first at some arbitrary point in time ( Figure 4C ). In this example the system is not reliant on an external clock. After detection of the synchronisation pulse a positive unipolar pulse (45 - Figure 4A ) represents a logical one and a negative unipolar pulse (46 - Figure 4B ) represents a logical zero.
- the energiser pulse rate is known or it can be determined by the monitor 72. An arbitrary number of data bits can be transmitted by the energiser to the monitor along the wires 62 and 64 to communicate information.
- a fence installation 80 includes energisers 60A, 60B, 60C and 60D respectively.
- Each energiser has a respective built-in detector, generally of the kind described in connection with Figure 5 , designated respectively 70A, 70B, 70C and 70D.
- the communication protocol is as follows: either a positive leading bipolar pulse ( Figure 4C ) or a positive unipolar pulse ( Figure 4A ) represents a logical one and either a negative leading bipolar pulse ( Figure 4D ) or a negative unipolar pulse ( Figure 4B ) represents a logical zero.
- This approach has an advantage in that the energisers may run at reduced energy levels when there is little fence loading.
- Each energiser is used to electrify a corresponding fence section designated 62A, 62B, 62C, and 62D respectively.
- a monitor or control unit 84 is connected to the energiser 60A which is treated as a master in the system.
- FIG. 6 The arrangement shown in Figure 6 is typical of a security installation in which a defined area is bounded by the fence sections each of which is electrified through the use of a separate energiser.
- the control unit 84 is used to give instructions to each energiser and to monitor the status of each energiser.
- the detector 70B monitors the fence pulses generated by the energiser 60A; the detector 70C monitors the pulses produced by operation of the energiser 60B; the detector 70D monitors the pulses produced by operation of the energiser 60C; and the detector 70A monitors the pulses produced by operation of the energiser 60D.
- Each energiser is aware of its respective status (i.e. a master or slave) in terms of its location in the sequence with respect to the master energiser 60A and the total number of energisers in the system, and each of the energisers 60B, 60C and 60D can interpret commands from the master energiser 60A.
- the remaining three energisers can synchronise their clocks to identify a particular bit position in the data stream and transmit their respective data.
- An arbitrary protocol of a three bit binary code is used for this example.
- the protocol may be changed in order to decrease the response time or to increase the amount of information which can be transmitted. If the energiser 60A receives information which is not identical to the information which it transmitted, due to a possible communication loss, it can attempt to resynchronise the system.
- each respective detector 70 may be so designed, or include an algorithm, to measure signals which are in a certain time window only so as to exclude interference from other energisers or extraneous sources.
- each energiser If all the energisers are turned off then no communication is possible in the system. It is however possible to design each energiser with a detector which has significant dynamic range so that although the energiser output is reduced communication is maintained. This has the benefit that the leading edge of any waveform can be positioned in time so that all energisers remain in synchronisation in order to comply with pulse repetition rates.
- each energiser use may, if required, be made of an external reference such as a clock or GPS receiver to ensure that within reason absolute synchronisation is achieved. This makes communication simpler and has advantages under certain fault conditions.
- ENERGISER PULSE TRANSMISSION 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 TxA A1 A2 A3 A1 TxB A1 B1 A2 B2 A3 B3 A1 B1 TxC A1 B1 C1 A2 B2 C2 A3 B3 C3 A1 B1 TxD A1 B1 C1 D1 A2 B2 C2 D2 A3 B3 C3 D3 A1 RxA A1 B1 C1 D1 A2 B2 C2 D2 A3 B3 C3 D3 D3
- the energiser 60A transmits its control information in the slots 0,4 and 8.
- the remaining slots of the energiser 60A can have an arbitrary value.
- the energiser 60B receives the information sent by the energiser 60A in the corresponding slots 0,4 and 8 and transmits this information in the slots 1,5 and 9.
- the energiser 60B ignores the pulses received in all other slots. It also sends the three bits of information pertaining to itself in slots 2,6 and 10.
- the remaining slots of the energiser 60B i.e. slots 0,3,4,7,8 etc.
- This process is repeated by the remaining two energisers.
- Another aspect which flows from the energiser of the invention relates to its energy saving characteristic and reduced electromagnetic interference level. Assume, for example, that use is made of the energiser shown in Figure 2 in the arrangement of Figure 5 .
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Insects & Arthropods (AREA)
- Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
- Platform Screen Doors And Railroad Systems (AREA)
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
Claims (8)
- Procédé de transfert de données le long d'une clôture électrique qui comprend au moins un premier conducteur allongé, caractérisé par les étapes consistant à mettre sous tension l'au moins un premier conducteur en utilisant un premier train d'impulsions sélectionnées parmi une première impulsion unipolaire d'une première polarité (45), une deuxième impulsion unipolaire d'une deuxième polarité (46) et des impulsions bipolaires (47, 48), et utiliser des impulsions prédéterminées, sélectionnées dans le premier train d'impulsions, pour représenter des informations définies.
- Procédé selon la revendication 1, dans lequel les informations sont exprimées sous forme binaire avec une ou plusieurs impulsions définies représentant un zéro logique et une ou plusieurs impulsions définies représentant un un logique.
- Procédé selon la revendication 1 ou 2, dans lequel les impulsions prédéterminées sont envoyées en groupes à des espacements prédéterminés l'un de l'autre ou dans des séquences prédéterminées.
- Procédé selon l'une quelconque des revendications 1 à 3, qui comprend l'étape consistant à sélectionner des impulsions pour mettre sous tension le conducteur dans une plage d'impulsions afin de représenter des données tout en assurant en même temps que les impulsions sont conformes aux réglementations de sécurité en vigueur au moins en ce qui concerne l'énergie par impulsion et les fréquences de répétition d'impulsions.
- Procédé selon l'une quelconque des revendications 1 à 4, dans lequel le premier train d'impulsions est envoyé d'un premier dispositif de mise sous tension à un deuxième dispositif de mise sous tension, et le deuxième dispositif de mise sous tension met sous tension au moins un deuxième conducteur avec le premier train d'impulsions et avec un deuxième train d'impulsions sélectionnées parmi une première impulsion unipolaire d'une première polarité, une deuxième impulsion unipolaire d'une deuxième polarité et des impulsions bipolaires, et dans lequel des impulsions prédéterminées, sélectionnées dans le deuxième train d'impulsions, représentent des informations définies.
- Dispositif de mise sous tension (24) qui comprend un premier générateur (30, 26) pour générer une première impulsion (45) d'une première polarité, un deuxième générateur (32, 28) pour générer une deuxième impulsion (46) d'une deuxième polarité, et une unité de commande (33) pour commander le fonctionnement des premier et deuxième générateurs, caractérisé en ce que l'unité de commande est telle que, en ce qui concerne des premier et deuxième intervalles de temps adjacents, étant chacun d'une durée définie, une première impulsion (45) ou une deuxième impulsion (46) est générée dans le premier intervalle de temps et aucune impulsion, une première impulsion (45) ou une deuxième impulsion (46) est générée dans le deuxième intervalle de temps.
- Dispositif de mise sous tension selon la revendication 6, dans lequel l'unité de commande commande au premier générateur (30, 26) et au deuxième générateur (32, 28) de produire un train d'impulsions avec des impulsions sélectionnées parmi des impulsions unipolaires respectivement d'une première polarité et d'une deuxième polarité et des impulsions bipolaires avec respectivement un front d'attaque positif et un front d'attaque négatif.
- Installation de clôture qui comprend au moins un premier conducteur allongé (62A) et un deuxième conducteur allongé (62B), un premier dispositif de mise sous tension (60A) selon l'une quelconque des revendications 6 et 7 pour mettre sous tension le premier conducteur (62A) et un deuxième dispositif de mise sous tension (60B) selon l'une quelconque des revendications 6 à 7 pour mettre sous tension le deuxième conducteur (62B), et dans lequel le deuxième dispositif de mise sous tension (60B) reçoit des impulsions générées par le premier générateur et par le deuxième générateur du premier dispositif de mise sous tension (60A) et transmet ces impulsions avec les impulsions générées par le premier générateur et par le deuxième générateur du deuxième dispositif de mise sous tension (60B) sur le deuxième conducteur (62B).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ZA200409911 | 2004-12-07 | ||
PCT/ZA2005/000180 WO2006063368A1 (fr) | 2004-12-07 | 2005-12-07 | Transfert de donnees sur cloture electrique |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1834514A1 EP1834514A1 (fr) | 2007-09-19 |
EP1834514B1 true EP1834514B1 (fr) | 2011-09-28 |
Family
ID=36117506
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05856153A Ceased EP1834514B1 (fr) | 2004-12-07 | 2005-12-07 | Transfert de donnees sur cloture electrique |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1834514B1 (fr) |
AU (1) | AU2005314444B2 (fr) |
WO (1) | WO2006063368A1 (fr) |
ZA (1) | ZA200705864B (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2022154676A1 (fr) * | 2021-01-13 | 2022-07-21 | Gallagher Group Limited | Dispositifs, procédés et systèmes de surveillance de clôtures électriques |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007012090A1 (fr) * | 2005-07-22 | 2007-01-25 | Sean Hurly | Regulateur d'energie de sortie pour electrificateur de cloture |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4310869A (en) * | 1979-03-21 | 1982-01-12 | Gallagher Electronics Limited Company | Electric fence energizer output control circuits |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NZ219542A (en) * | 1986-07-04 | 1989-04-26 | Gallagher Electronics Ltd | Electric fence energiser with multiple pulse generators |
EP0670102B1 (fr) * | 1992-11-20 | 1997-07-09 | Gallagher Electronics Limited | Systeme de commande electronique |
FR2787964B1 (fr) * | 1998-12-23 | 2001-03-23 | Lacme | Electrificateur de cloture, a transformateur en faible masse |
-
2005
- 2005-12-07 AU AU2005314444A patent/AU2005314444B2/en not_active Ceased
- 2005-12-07 WO PCT/ZA2005/000180 patent/WO2006063368A1/fr active Search and Examination
- 2005-12-07 EP EP05856153A patent/EP1834514B1/fr not_active Ceased
-
2007
- 2007-05-31 ZA ZA200705864A patent/ZA200705864B/xx unknown
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4310869A (en) * | 1979-03-21 | 1982-01-12 | Gallagher Electronics Limited Company | Electric fence energizer output control circuits |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2022154676A1 (fr) * | 2021-01-13 | 2022-07-21 | Gallagher Group Limited | Dispositifs, procédés et systèmes de surveillance de clôtures électriques |
GB2618020A (en) * | 2021-01-13 | 2023-10-25 | Gallagher Group Ltd | Devices, methods and systems for monitoring electric fences |
Also Published As
Publication number | Publication date |
---|---|
ZA200705864B (en) | 2008-08-27 |
AU2005314444B2 (en) | 2010-07-22 |
EP1834514A1 (fr) | 2007-09-19 |
AU2005314444A1 (en) | 2006-06-15 |
WO2006063368A1 (fr) | 2006-06-15 |
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