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1. WO2020157477 - COMPTEUR ÉLECTRIQUE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

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Claims

1. An electricity meter comprising:

a converter configured to synchronously modulate current and voltage measurement signals and output synchronously-modulated current and voltage measurement signals; and

a measurement module configured to receive the synchronously-modulated current and voltage measurement signals from the converter and to process the synchronously-modulated current and voltage measurement signals.

2. The electricity meter of claim 1. wherein the converter comprises:

a source of a time-varying signal used for synchronously modulating the current and voltage measurement signals.

3· The electricity meter of claim 2, wherein the time-varying signal has at least one component which is fixed in frequency.

4. The electricity meter of claim 2 or 3, wherein the time-varying signal has at least one component which varies in frequency.

5. The electricity meter of any one or claims 2 to 4, wherein the time-varying signal is a spread spectrum signal.

6. The electricity meter of any one or claims 1 to 5, wherein the converter is configured not to modulate or to modulate on average less than 10% of time at a fundamental frequency or a harmonic frequency of 50, 60 or 16.667, or at 400 Hz.

7. The electricity meter of any one or claims 1 to 6, wherein the converter is configured to modulate at frequency or frequencies between lHz and 1 MHz.

8. The electricity meter of any one or claims 1 to 7, wherein the converter is configured to modulate at frequency or frequencies between 51 and 59 Hz, between 61 and 65 Hz and/or between 67 and 390 Hz.

9. The electricity meter of any one or claims 1 to 8, comprising:

first and second modulators configured to synchronously modulate the current and voltage measurement signals, respectively, and to output the synchronously-modulated current and voltage measurement signals, respectively.

to. The electricity meter of claim 9, wherein the first and second modulators comprise first and second bus exchange switches, respectively.

11. The electricity meter of claim 9, wherein the first and second modulators comprise first and second sets of switching devices, respectively.

12. The electricity meter of claim 11, wherein the first and second modulators comprise first and second sets of field effect transistors, respectively.

13. The electricity meter of claim 11, wherein the first and second modulators comprise first and second sets of analogue switches, respectively.

14. The electricity meter of claim 11, wherein the first and second modulators comprise first and second sets of 4 quadrant analogue multipliers, respectively.

15. The electricity meter of any one or claims 1 to 14, wherein the measurement module comprises:

first and second analogue-to-digital converters for digitising the synchronously-modulated current and voltage measurement signals, respectively and outputting digitised, synchronously-modulated current and voltage measurement signals.

16. The electricity meter of claim 15, wherein the first and second analogue-to-digital converters are contained in a single integrated circuit.

17. The electricity meter of claim 15 or 16, wherein the measurement module comprises:

a digital calculating unit to calculate a current value, a voltage value, a power value and/ or an energy value.

18. The electricity meter of claim 17, wherein the digital calculating unit is configured to calculate the power value by multiplying the digitised, synchronously-modulated current and voltage measurement signals.

19. The electricity meter of claim 17 or 18, wherein the digital calculating unit comprises a microprocessor running a computer program to calculate the current value, the voltage value, the power value and/or the energy value.

20. The electricity meter of claim 17 or 18, wherein the digital calculating unit comprises hardware logic to calculate the current value, the voltage value, the power value and/ or the energy value.

21. The electricity meter of any one or claims 1 to 20, further comprising:

at least one output device for providing a current value, a voltage value, a power value and/ or an energy value.

22. The electricity meter of claim 21, further comprising:

a display for displaying the current value, the voltage value, the power value and/ or the energy value.

23. The electricity meter of claim 21 or 22, wherein the at least one output device comprises:

a network interface for transmitting the current value, the voltage value, the power value and/ or the energy value.

24. The electricity meter of any one of claims 1 to 23, further comprising:

an input for receiving the current measurement signal from a remote current sensor.

25. The electricity meter of any one of claims 1 to 24, further comprising:

a current sensor arranged to provide the current measurement signal.

26. The electricity meter of any one of claims 1 to 25, wherein a current sensor is dc coupled to a modulator for modulating the current measurement signal.

27. The electricity meter of any one of claims 24 to 26, wherein the remote current sensor or current sensor is a shunt.

28. The electricity meter of claim 27, further comprising:

first and second conductors for transferring power from a source to a load;

wherein the remote current or current source is configured to measure current flowing through the first conductor.

29. The electricity meter of claim 27 or 28, further comprising:

first and second connections to the shunt for providing the current measurement signal; and

a modulator directly connected to the shunt via the first and second connections.

30. The electricity meter of claim 29, wherein at least one of the first and second connections between the shunt and the modulator comprise the same material as the shunt.

31. The electricity meter of any one of claims 27 to 30, wherein the shunt comprises a metal alloy including copper, nickel and manganese, optionally Manganin (RTM).

32. The electricity meter of any one of claims 27 to 31, wherein the shunt comprises a material having a temperature coefficient of electrical resistance of:

between o and 10x10-6 /K or o and -10x10-6 /K or

· between o and 20x10-6 /K or o and -20x10-6 /K;

for a temperature in a range between 20 °C and 50 °C.

33. The electricity meter of any one of claims 27 to 32, wherein the remote current sensor or current sensor is:

a Hall effect current sensor;

a flux gate current sensor;

an anisotropic magnetoresistance current sensor;

a giant magnetoresistance current sensor; or

a tunnelling magnetoresistance current sensor.

34. The electricity meter of any one of claims 1 to 33, which is a dc electricity meter.

35. The electricity meter of any one of claims 1 to 34, which is an ac electricity meter.

36. The electricity meter of any one of claims 1 to 35, which complies with an ANSI standard for electricity meters.

37. The electricity meter of any one of claims 1 to 36, which complies with an IEC standard for electricity meters.

38. A system comprising:

an electric power source;

an output to a power sink;

optionally, the power sink; and

the electricity meter of any one of claims 1 to 37 interposed in an electrical path between the electric power source and the output to a power sink.

39. The system of claim 38, which is a photovoltaic system, wherein the electric power source comprises a photovoltaic panel and the power sink comprises a distribution network, energy storage or a load.

40. The system of claim 38, which is an electric vehicle charging system, wherein the electric power source is a distribution system and the energy storage is an electric vehicle energy storage device.

41. The system of claim 38, which is a dc grid system, wherein the electric power source comprises an electricity power source or storage system and the power sink is a load.

42. The system of any one of claims 38 to 41, further comprising:

a dc-dc converter interposed in the electrical path between the electric power source and the electricity meter or between the electricity meter and the output to the power sink.

43. A method, comprising:

performing current and voltage measurements to produce current and voltage measurement signals, respectively; and

in an electricity meter:

synchronously modulating the current and voltage measurement signals and output synchronously-modulated current and voltage measurement signals; and

measuring the synchronously-modulated current and voltage measurement signals.