Self-calibrating contactless power consumption sensing
View Patent ↗A system for sensing electrical power usage in an electrical power infrastructure of a structure. The system can include a sensing device configured to be attached to a panel of the circuit breaker box overlying at least part of the one or more main electrical power supply lines. The system also can include a calibration device configured to be electrically coupled to the electrical power infrastructure of the structure. The system further can include one or more processing modules configured to receive one or more output signals from the sensing device. The sensing device can be devoid of being electrically or physically coupled to the one or more main electrical power supply lines or the electrical power infrastructure when the sensing device is attached to the panel. Other embodiments are provided.
1. A system for sensing electrical power usage in an electrical power infrastructure of a structure, the structure comprising a circuit breaker box and one or more main electrical power supply lines for the electrical power infrastructure of the structure, the system comprising:
a sensing device configured to be attached to a panel of the circuit breaker box overlying at least part of the one or more main electrical power supply lines, the sensing device comprising one or more magnetic field sensors;
a calibration device configured to be electrically coupled to the electrical power infrastructure of the structure, the calibration device comprising a load unit; and
one or more processing modules configured to receive one or more output signals from the sensing device,
wherein:
the sensing device is devoid of being electrically or physically coupled to the one or more main electrical power supply lines or the electrical power infrastructure when the sensing device is attached to the panel;
the one or more processing modules are further configured to determine the electrical power usage when the sensing device is coupled at any location over the panel, based at least in part on the one or more output signals received from the sensing device;
the load unit of the calibration device is configured to draw a range of loads;
the one or more processing modules are configured to use the sensing device to determine a range of the electrical power usage; and
the range of loads is less than the range of the electrical power usage.
2. The system of claim 1 , wherein:
the one or more processing modules are further configured to determine the electrical power usage when the sensing device is devoid of being located over the one or more main electrical power supply lines, is devoid of being located over one or more branch electrical power lines that are electrically coupled to the one or more main electrical power supply lines, and is devoid of being located over one or more branch circuit breakers that are electrically coupled to the one or more branch electrical power lines.
3. The system of claim 1 , wherein:
the one or more processing modules are further configured to determine the electrical power usage when the sensing device is devoid of being located at a predetermined location over the panel.
4. The system of claim 1 , wherein:
the load unit of the calibration device is configured to provide a maximum load of no more than 1000 watts.
5. The system of claim 1 , wherein:
the load unit of the calibration device is configured to provide a maximum load of no more than 300 watts.
6. The system of claim 1 , wherein:
the one or more processing modules are further configured to determine a phase difference between an electrical current flowing in the one or more main electrical power supply lines and a voltage of the one or more main electrical power supply lines.
7. The system of claim 6 , wherein:
the one or more processing modules are further configured to determine a real power usage based at least in part on the phase difference.
8. The system of claim 7 , wherein:
the sensing device further comprises one or more magnets surrounding the one or more magnetic field sensors, the one or more magnets configured to saturate a magnetic field induced by the panel.
9. The system of claim 1 , wherein:
the load unit of the calibration device is configured to draw no more than four discrete loads.
10. The system of claim 1 , wherein:
the range of loads is less than 20% of the range of the electrical power usage.
11. A method of providing a system for sensing electrical power usage in an electrical power infrastructure of a structure, the structure comprising a circuit breaker box and one or more main electrical power supply lines for the electrical power infrastructure of the structure, the method comprising:
providing a sensing device configured to be attached to a panel of the circuit breaker box overlying at least part of the one or more main electrical power supply lines, the sensing device comprising one or more magnetic field sensors;
providing a calibration device configured to be electrically coupled to the electrical power infrastructure of the structure, the calibration device comprising a load unit; and
providing one or more processing modules configured to receive one or more output signals from the sensing device,
wherein:
the sensing device is devoid of being electrically or physically coupled to the one or more main electrical power supply lines or the electrical power infrastructure when the sensing device is attached to the panel;
the one or more processing modules are further configured to determine the electrical power usage when the sensing device is coupled at any location over the panel, based at least in part on the one or more output signals received from the sensing device;
the load unit of the calibration device is configured to draw a range of loads;
the one or more processing modules are configured to use the sensing device to determine a range of the electrical power usage; and
the range of loads is less than the range of the electrical power usage.
12. The method of claim 11 , wherein:
providing the one or more processing modules comprises providing the one or more processing modules to be further configured to determine the electrical power usage when the sensing device is devoid of being located over the one or more main electrical power supply lines, is devoid of being located over one or more branch electrical power lines that are electrically coupled to the one or more main electrical power supply lines, and is devoid of being located over one or more branch circuit breakers that are electrically coupled to the one or more branch electrical power lines.
13. The method of claim 11 , wherein:
providing the one or more processing modules comprises providing the one or more processing modules to be further configured to determine the electrical power usage when the sensing device is devoid of being located at a predetermined location over the panel.
14. The method of claim 11 , wherein:
providing the calibration device comprises providing the load unit of the calibration device to be configured to provide a maximum load of no more than 1000 watts.
15. The method of claim 11 , wherein:
providing the calibration device comprises providing the load unit of the calibration device to be configured to provide a maximum load of no more than 300 watts.
16. The method of claim 11 , wherein:
providing the one or more processing modules comprises providing the one or more processing modules to be further configured to determine a phase difference between an electrical current flowing in the one or more main electrical power supply lines and a voltage of the one or more main electrical power supply lines.
17. The method of claim 16 , wherein:
providing the one or more processing modules comprises providing the one or more processing modules to be further configured to determine a real power usage based at least in part on the phase difference.
18. The method of claim 17 , wherein:
providing the sensing device further comprises providing one or more magnets surrounding the one or more magnetic field sensors, the one or more magnets configured to saturate a magnetic field induced by the panel.
19. The method of claim 11 , wherein:
providing the calibration device comprises providing the load unit of the calibration device to be configured to draw no more than four discrete loads.
20. The method of claim 11 , wherein:
the range of loads is less than 20% of the range of the electrical power usage.