WO2006063368A1 - Transfert de donnees sur cloture electrique - Google Patents

Transfert de donnees sur cloture electrique Download PDF

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Publication number
WO2006063368A1
WO2006063368A1 PCT/ZA2005/000180 ZA2005000180W WO2006063368A1 WO 2006063368 A1 WO2006063368 A1 WO 2006063368A1 ZA 2005000180 W ZA2005000180 W ZA 2005000180W WO 2006063368 A1 WO2006063368 A1 WO 2006063368A1
Authority
WO
WIPO (PCT)
Prior art keywords
pulses
pulse
energiser
train
conductor
Prior art date
Application number
PCT/ZA2005/000180
Other languages
English (en)
Inventor
Leslie Sean Hurly
Original Assignee
Leslie Sean Hurly
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 Leslie Sean Hurly filed Critical Leslie Sean Hurly
Priority to EP05856153A priority Critical patent/EP1834514B1/fr
Priority to AU2005314444A priority patent/AU2005314444B2/en
Publication of WO2006063368A1 publication Critical patent/WO2006063368A1/fr

Links

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. 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 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.
  • a plurality of energisers can be placed in communication with each other in this cascaded or daisy-chain method although, due to the constraints of prescribed pulse repetition rates and the energy which is required per pulse in order to satisfactorily electrify a fence the number of energisers which can be cascaded for data information purposes will be limited.
  • the invention also extends to an energiser 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 h and second generators.
  • the control unit may be 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.
  • Figure 1 illustrates an energiser circuit of known construction i.e. forming part of the prior art
  • Figure 2 illustrates a half bridge energiser circuit in accordance with the present invention
  • Figure 3 illustrates a full bridge energiser circuit in accordance with a second form of the invention
  • Figures 4A, 4B and 4C and 4D respectively illustrate waveforms which can be produced by the circuits of Figures 2 and 3;
  • FIGS 5 and 6 schematically illustrate different electric fence installations in which data transfer can take place in accordance with the method of the invention.
  • 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.
  • the switch 30 is closed * energy from the capacitor 26 is discharged and passes through the primary winding 38 in a first direction producing an output pulse of a first polarity. If the switch 32 is closed then energy from the capacitor 28 is passed in a second direction through the primary winding and an output pulse of an opposing, second plurality is produced.
  • Figure 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.
  • 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 3OA 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 3OA 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 3OA 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 3OA 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 6OA, 6OB, 6OC and 6OD respectively.
  • Each energiser has a respective built-in detector, generally of the kind described in connection with Figure 5, designated respectively 7OA,
  • 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 6OA which is treated as a master in the system.
  • 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 7OB monitors the fence pulses generated by the energiser 6OA; the detector 7OC monitors the pulses produced by operation of the energiser 6OB; the detector 7OD monitors the pulses produced by operation of the energiser 6OC; and the detector 7OA monitors the pulses produced by operation of the energiser 6OD.
  • 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 6OA and the total number of energisers in the system, and each of the energisers 6OB, 6OC and 6OD can interpret commands from the master energiser 6OA.
  • 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 6OA 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.
  • an external reference such as a clock or GPS receiver
  • A1 , A2, A3 are three respective bits for a first word of information for the energiser 6OA; A1 , A2, A3 are three respective bits for a second word of information for the energiser 6OA;
  • TxA is the information transmitted by the energiser 6OA
  • TxB is the information transmitted by the engerizer 6OB, etc.; the uppermost row 0, 1 , 2 is the energiser high voltage pulse sequence on the fence, in predetermined time slots or with the pulses in defined positions. Data pulses are shown and the open blocks or slots can be occupied by pulses representing any arbitrary excitation of the fence i.e. not conveying information.
  • the energiser 6OA transmits its control information in the slots 0,4 and 8.
  • the remaining slots of the energiser 6OA can have an arbitrary value.
  • the energiser 6OB 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 6OB 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 6OB 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)
  • Platform Screen Doors And Railroad Systems (AREA)
  • Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
  • Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)

Abstract

Clôture électrique comprenant un premier générateur destiné à générer une première impulsion d'une première polarité, un second générateur destiné à générer une seconde impulsion d'une seconde polarité et une unité de commande destinée à commander le fonctionnement des premier et second générateurs.
PCT/ZA2005/000180 2004-12-07 2005-12-07 Transfert de donnees sur cloture electrique WO2006063368A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP05856153A EP1834514B1 (fr) 2004-12-07 2005-12-07 Transfert de donnees sur cloture electrique
AU2005314444A AU2005314444B2 (en) 2004-12-07 2005-12-07 Data transfer on an electric fence

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA200409911 2004-12-07
ZA2004/9911 2004-12-07

Publications (1)

Publication Number Publication Date
WO2006063368A1 true WO2006063368A1 (fr) 2006-06-15

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ID=36117506

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Application Number Title Priority Date Filing Date
PCT/ZA2005/000180 WO2006063368A1 (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)

* Cited by examiner, † Cited by third party
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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20240076900A1 (en) * 2021-01-13 2024-03-07 Gallagher Group Limited Devices, methods and systems for monitoring electric fences

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4859868A (en) * 1986-07-04 1989-08-22 Gallagher Electronics Limited Electric fence energizer
WO1994013120A1 (fr) * 1992-11-20 1994-06-09 Gallagher Electronics Limited Systeme de commande electronique
US6479909B1 (en) * 1998-12-23 2002-11-12 Lacme Closure electrifier with a low mass transformer

Family Cites Families (1)

* Cited by examiner, † Cited by third party
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4859868A (en) * 1986-07-04 1989-08-22 Gallagher Electronics Limited Electric fence energizer
WO1994013120A1 (fr) * 1992-11-20 1994-06-09 Gallagher Electronics Limited Systeme de commande electronique
US6479909B1 (en) * 1998-12-23 2002-11-12 Lacme Closure electrifier with a low mass transformer

Cited By (1)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
AU2005314444A1 (en) 2006-06-15
EP1834514B1 (fr) 2011-09-28
AU2005314444B2 (en) 2010-07-22
ZA200705864B (en) 2008-08-27
EP1834514A1 (fr) 2007-09-19

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