IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0601409
(2008-05-23)
|
등록번호 |
US-8274774
(2012-09-25)
|
우선권정보 |
GB-0709824.7 (2007-05-23) |
국제출원번호 |
PCT/GB2008/001763
(2008-05-23)
|
§371/§102 date |
20091123
(20091123)
|
국제공개번호 |
WO2008/142421
(2008-11-27)
|
발명자
/ 주소 |
- Kitchener, Renato
- Rogoll, Gunther
- Kessler, Michael
|
출원인 / 주소 |
|
대리인 / 주소 |
Lerner, David, Littenberg, Krumholz & Mentlik, LLP
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
1 |
초록
▼
An electrical circuit comprising a power supply, a load, a pair of parallel positive cables between the power supply and the load, a pair of parallel negative cables between the load and the power supply, and incendive arc prevention means, comprising: monitoring means adapted to detect if the curre
An electrical circuit comprising a power supply, a load, a pair of parallel positive cables between the power supply and the load, a pair of parallel negative cables between the load and the power supply, and incendive arc prevention means, comprising: monitoring means adapted to detect if the current and/or voltage in one of the pair of cables deviates from the other, and a control means adapted to fully or partially isolate the power supply from the pair of cables if the monitoring means detects that their current and/or voltage has deviated from the other, characterised in which: the electrical circuit comprises a common positive section between the power supply and the pair of positive cables, and a common negative section between the pair of negative cables and the power supply, in which a first modulation means is adapted to generate a modulated communications signal.
대표청구항
▼
1. An electrical circuit comprising a power supply, a load, a pair of parallel positive cables between the power supply and the load, a pair of parallel negative cables between the load and the power supply, and incendive arc prevention means, in which the incendive arc prevention means comprises mo
1. An electrical circuit comprising a power supply, a load, a pair of parallel positive cables between the power supply and the load, a pair of parallel negative cables between the load and the power supply, and incendive arc prevention means, in which the incendive arc prevention means comprises monitoring means adapted to monitor the pair of positive cables and the pair of negative cables, and to detect if the current and/or voltage in one of the pair of positive cables deviates from the other, and if the current and/or voltage in one of the pair of negative cables deviates from the other,and in which the incendive arc prevention means comprises a control means adapted to fully or partially isolate the power supply from the pair of positive cables and the pair of negative cables if the monitoring means detects that the current and/or voltage of one of the pair of positive cables has deviated from the other, or if the current and/or voltage of one of the pair of negative cables has deviated from the other, characterised in which:the electrical circuit comprises a common positive section between the power supply and the pair of positive cables, and a common negative section between the pair of negative cables and the power supply, in which a first modulation means is provided in the common positive section or the common negative section, in which impedance means is provided between the power supply and the first modulation means, and in which the first modulation means is adapted to generate a modulated communications signal. 2. An electrical circuit as claimed in claim 1 in which the electrical circuit comprises a load end common positive section between the pair of positive cables and the load, and a load end common negative section between the load and the pair of negative cables, in which a second modulation means is provided in the load end common positive section or the load end common negative section, and in which the second modulation means is adapted to demodulate said modulated communications signal. 3. An electrical Circuit as claimed in claim 2 in which the second modulation means is adapted to generate a return modulated communications signal, and in which the first modulation means is adapted to demodulate said return modulated communications signal. 4. An electrical circuit as claimed in claim 3 in which the second modulation means comprises said load, and the electrical circuit is only for the purpose of communication. 5. An electrical circuit as claimed in claim 3 in which the load comprises one or more field devices, and in which the electrical circuit provides power for said one or more field devices. 6. An electrical circuit as claimed in claim 4 in which the impedance means is provided in the common positive section. 7. An electrical circuit as claimed in claim 4 in which the impedance means is provided in the common negative section. 8. An electrical circuit as claimed in claim 4 in which the impedance means comprises a first impedance means in the common positive section, and a second impedance means in the common negative section. 9. An electrical circuit as claimed in claim 8 in which the first impedance means and the second impedance means comprise balanced inductive reactors. 10. An electrical circuit as claimed in claim 9 in which the first modulation means comprises a capacitor coupled modulator mounted across the circuit between the common positive section and the common negative section, and in which the second modulation means comprises a capacitor coupled modulator mounted across the circuit between the load end common positive section and the load end common negative section. 11. An electrical circuit as claimed in claim 2 in which the electrical circuit is adapted to carry DSL signals, and in which the first modulation means and the second modulation means communicate with one another according to the DSL protocol. 12. An electrical circuit as claimed in claim 3, in which the electrical circuit is provided with media converters adapted to convert the modulated communications signal and/or said return modulated communications signal into other media for transmission to associated devices with which the electrical circuit is used, and to convert incoming signals from said associated devices in other media into the modulated communications signal and/or the return modulated communications signal, and in which the media converts are adapted to convert the modulated communications signal and/or the return modulated communications signal to and from any one or more of the following other media: Ethernet, Power over Ethernet (PoE), Fieldbus, Radio, 4-20mA digital I/O, HART, RTD, T/C, Strain Gauge, Modbus or Optical. 13. An electrical circuit as claimed in claim 12 in which the pair of positive cables are formed into a first twisted pair, in which the pair of negative cables are formed into a second twisted pair, and in which the first twisted pair and the second twisted pair are bundled together in the same outer cable. 14. An electrical circuit as claimed in claim 13 in which a first positive cable and a first negative cable are formed into a first twisted pair, in which a second positive cable and a second negative cable are formed into a second twisted pair, and in which the first twisted pair and the second twisted pair are bundled together in the same outer cable. 15. An electrical circuit as claimed in claim 1 in which the monitoring means comprises inductive reactors situated at both ends of each of the pair of positive cables, and at both ends of each of the pair of negative cables, in which the two inductive reactors at a first end of the pair of positive cables share a first common core, in which the two inductive reactors at a first end of the pair of negative cables share a second common core, in which the two inductive reactors at a second end of the pair of positive cables share a third common core, and in which the two inductive reactors at a second end of the pair of negative cables share a fourth common core. 16. An electrical circuit as claimed in claim 15 in which the two inductive reactors at the first end of the pair of positive cables are wound around the first common core in opposite directions, in which the two inductive reactors at the first end of the pair of negative cables are wound around the second common core in opposite directions, in which the two inductive reactors at the second end of the pair of positive cables are wound around the third common core in opposite directions, and in which the two inductive reactors at the second end of the pair of negative cables are wound around the fourth common core in opposite directions. 17. An electrical circuit as claimed in claim 16 in which the monitoring means comprises a first sensor coil wound round the first common core, a second sensor coil wound round the second common core, a third sensor coil would round the third common core and a fourth sensor coil would round the fourth common core. 18. An electrical circuit as claimed in claim 17 in which the first sensor coil and the second sensor coil are fed to a first processor adapted to drive a first isolation means adapted to fully or partially isolate the power supply from the pair of positive cables and the pair of negative cables if signals are received from the first sensor coil or the second sensor coil, and in which the third sensor coil and the fourth sensor coil are fed to a second processor adapted to drive a second isolation means adapted to fully or partially isolate the load from the first pair of positive cables and the first pair of negative cables if signals are received from the third sensor coil or the fourth sensor coil. 19. An electrical circuit as claimed in claim 17 in which the first sensor coil and the second sensor coil are fed to window comparators adapted to drive a first isolation means adapted to fully or partially isolate the power supply from the pair of positive cables and the pair of negative cables if signals are received from the first sensor coil or the second sensor coil, and in which the third sensor coil and the fourth sensor coil are fed to window comparators adapted to drive a second isolation means adapted to fully or partially isolate the load from the first pair of positive cables and the first pair of negative cables if signals are received from the third sensor coil or the fourth sensor coil. 20. An electrical circuit as claimed in claim 18 in which the first isolation means comprises an isolating element between the power supply and the pair of positive cables and the pair of negative cables, and in which the second isolation means comprises an isolating element between the load and the pair of positive cables and the pair of negative cables. 21. An electrical circuit as claimed in claim 20 in which all the inductive reactors are provided with resistive shunts. 22. An electrical circuit as claimed in any of claim 1 in which monitoring means is adapted to separately monitor the current and/or voltage in both the pair of positive cables and both the pair of negative cables in order to discern if the current and/or the voltage of one of the pair of positive cables, or one of the pair of negative cables, deviates from the other. 23. An electrical circuit as claimed in claim 2 in which the monitoring means is adapted to separately monitor the current and/or voltage in one of the pair of positive cables, in one of the pair of negative cables, and at least one of the common positive section, the common negative section, the load end common positive section or the load end common negative section, and in which the control means adapted to fully or partially isolate the power supply from the first pair of positive cables and the first pair of negative cables if the current and/or voltage in the one positive cable or the one negative cable deviates from substantially half the current and/or voltage in the common positive section, the common negative section, the load end common positive section or the load end common negative section, whichever is monitored. 24. An electrical circuit as claimed in claim 22 in which each of the pair of positive cables is provided with a diode at its load end, and in which each of the pair of negative cables is provided with a diode at its load end. 25. An electrical circuit as claimed in claim 1 in which the control means is adapted to re-connect the power supply to the pair of positive cables and the pair of negative cables a pre-determined time after it has been isolated therefrom in use. 26. An electrical circuit as claimed in claim 1 in which the pair of positive cables and/or the pair of negative cables is provided with a connector at one end comprising two pins, one for each cable, and in which the two pins are different lengths.
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