IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
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| 국제특허분류(IPC7판) |
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| 출원번호 |
US-0886321
(2004-07-07)
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| 등록번호 |
US-8593266
(2013-11-26)
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발명자
/ 주소 |
- Robertson, Mark Patrick
- Hossack, Graeme Peter
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| 출원인 / 주소 |
- Oilfield Equipment Development Center Limited
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| 대리인 / 주소 |
Patterson & Sheridan, L.L.P.
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| 인용정보 |
피인용 횟수 :
0 인용 특허 :
39 |
초록
▼
This invention relates to a power line communication (PLC) system wherein the power supply line supplies power and also acts as a communications supply line. A receiver is able to detect small changes in the modulated transmitted information and thereby shut down the circuit. The invention is partic
This invention relates to a power line communication (PLC) system wherein the power supply line supplies power and also acts as a communications supply line. A receiver is able to detect small changes in the modulated transmitted information and thereby shut down the circuit. The invention is particularly suitable for use where the IEL is remote from the power supply such as, for example, in down hole oil production situations where very long power cables are used.
대표청구항
▼
1. A power line communications (PLC) system, comprising: a power line,an electric motor having a set of windings,a power supply for powering the motor,a transmitter, anda receiver,said transmitter being operable to transmit information to the receiver on a power signal by modulating a leakage curren
1. A power line communications (PLC) system, comprising: a power line,an electric motor having a set of windings,a power supply for powering the motor,a transmitter, anda receiver,said transmitter being operable to transmit information to the receiver on a power signal by modulating a leakage current between two turns of the set of motor windings. 2. A PLC system according to claim 1, wherein multiple transmitters are used with each transmitter using a different modulation technique. 3. A PLC system according to claim 1, wherein multiple transmitters are used with each transmitter using the same modulation technique, but each having different modulation modes within that technique. 4. A PLC system according to claim 1, wherein the modulation is effected by an amplitude modulation technique. 5. A PLC system according to claim 1, wherein the receiver is able to filter out and recover the transmitted information. 6. A PLC system according to claim 1, wherein the transmitted information is contained within a sequence of modulations from the transmitter which are de-modulated and reconstructed by the receiver to recover a fully transmitted message. 7. A PLC system according to claim 6, wherein multiple consecutive or concurrent modulations occur in the same positive or negative half of current flow to the motor. 8. A PLC system according to claim 1, wherein a current flow through a modulated impedance is not rectified to provide modulated power flow in both positive and negative half-cycles of a current flow to the motor. 9. A PLC system according to claim 1, wherein a current detection circuit is used to determine a zero crossing of a current flow to the motor in order that the modulation is activated only at pre-determined points of current flow. 10. A PLC system according to claim 1, wherein a modulation time period is limited to a known pre-set value to reduce power loss within the modulation circuit. 11. A PLC system according to claim 1, wherein the modulation is controlled by temperature and power losses within the modulation circuit. 12. A PLC system according to claim 1, wherein a modulation time period is triggered to occur only at times of reduced current flow to the motor by reducing power loss within the modulation circuit. 13. A PLC system according to claim 1, wherein a modulation time period is triggered to occur only at times of reduced voltage applied to the motor thereby reducing power loss within the modulation circuit. 14. A PLC system according to claim 1, wherein: the transmitter includes a circuit to provide feedback on background noise at a mode of the modulation, andthe transmitter is operable to actively alter the modulation mode or a technique of the modulation. 15. A PLC system according to claim 14, wherein the receiver includes a circuit to sweep modulation modes in order to detect if the transmitter has modified the modulation mode in order to increase signal to noise ratio. 16. A PLC system according to claim 1, further comprising a voltage detection circuit to determine a zero crossing of voltage applied to the motor in order that modulations are activated only at fixed periods on a voltage waveform. 17. A PLC system as claimed in claim 1 wherein the two turns are in a single phase of the set of windings. 18. A PLC system as claimed in claim 1 wherein the two turns are selected close to the null point of the motor. 19. A PLC system as claimed in claim 1 wherein a proportion of total turns between the said two turns is selected in order to achieve a predetermined signal to noise ratio. 20. A PLC system according to claim 1, wherein the power flow supply is constant. 21. A PLC system according to claim 1, wherein a current flow through a modulated impedance is rectified to only provide modulated power flow in one half-cycle of the current flow to the motor. 22. A system for mine, sump, and quarry dewaterinq or oil production, comprising: a PLC system according to claim 1, wherein the motor, the transmitter, and the power line are submersible, anda submersible pump coupled to the motor for being driven thereby. 23. A power line communications (PLC) system, comprising: a power line,an electric motor having windings,a power supply for powering the motor,a transmitter, anda receiver,the transmitter being operable to transmit information to the receiver on a power signal by modulating a leakage current between two windings of a set of windings of the motor. 24. A PLC system according to claim 1, further comprising a thermistor in communication with the motor. 25. A PLC system according to claim 24, wherein the thermistor is operable to activate the transmitter in response to overheating of the motor.
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