Radio frequency occupancy sensing load control
First Claim
1. An occupancy sensing load control system comprising:
- a signal-generating unit configured for periodically generating a radio control signal at predefined time intervals, said radio control signal being configured to trigger a response signal from a mobile radio-emitting communication device located within a predetermined distance from said signal-generating unit;
a radio-frequency detector configured to detect said response signal;
an occupancy/vacancy signal generating device configured to determine occupancy and/or vacancy condition in response to the result of a detection of said response signal; and
a load control device connected between an electrical power source and an electrical load and configured to control the current supplied to said electrical load in response to a signal generated by said occupancy/vacancy signal generating device, wherein the occupancy/vacancy signal generating device is configured to determine occupancy condition only when said response signal has a strength that is greater than a predetermined threshold.
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Abstract
An occupancy sensing load control system is disclosed. The occupancy sensing load control system includes a detector unit, an occupancy/vacancy signal generator and a load control circuit. The detector unit detects RF signals emitted by cell phones or similar mobile communication devices within an area being monitored. The occupancy/vacancy signal generator generates a control signal for the load control circuit based on the detection of a qualified RF signal or the absence of such signal within a predetermined time interval. The occupancy sensing load control system may also include a signal-generating unit for generating a pseudo base station signal based on zone information of neighboring base stations for transmission to a mobile phone in the detection area.
22 Citations
41 Claims
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1. An occupancy sensing load control system comprising:
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a signal-generating unit configured for periodically generating a radio control signal at predefined time intervals, said radio control signal being configured to trigger a response signal from a mobile radio-emitting communication device located within a predetermined distance from said signal-generating unit; a radio-frequency detector configured to detect said response signal; an occupancy/vacancy signal generating device configured to determine occupancy and/or vacancy condition in response to the result of a detection of said response signal; and a load control device connected between an electrical power source and an electrical load and configured to control the current supplied to said electrical load in response to a signal generated by said occupancy/vacancy signal generating device, wherein the occupancy/vacancy signal generating device is configured to determine occupancy condition only when said response signal has a strength that is greater than a predetermined threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of controlling the amount of power delivered from an electrical power source to an electrical load provided in a space, said method comprising the steps of:
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providing a radio-frequency sensor in said space; providing a radio-frequency signal-generating unit; periodically transmitting a radio-frequency control signal into said space at predefined time intervals, said radio-frequency control signal being capable of triggering a response from a mobile radio frequency communication device located within said space; changing the amount of power delivered to the electrical load in response to the absence of a qualified radio-frequency response signal during a predetermined period of time, wherein said response signal has a strength that is greater than a predetermined threshold.
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20. An occupancy sensing load control system comprising:
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a signal-generating unit configured for periodically generating a radio control signal at predefined time intervals, said radio control signal being configured to trigger a response signal from a mobile radio-emitting communication device located within a predetermined distance from said signal-generating unit; a radio-frequency detector configured to detect said response signal; an occupancy/vacancy signal generating device configured to determine occupancy and/or vacancy condition in response to the result of a detection of said response signal; and a load control device connected between an electrical power source and an electrical load and configured to control the current supplied to said electrical load in response to a signal generated by said occupancy/vacancy signal generating device, wherein the radio-frequency detector comprises two or more antennas and is configured to compare signals received by said antennas. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. An occupancy sensing load control system comprising:
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a signal-generating unit configured for periodically generating a radio control signal at predefined time intervals, said radio control signal being configured to trigger a response signal from a mobile radio-emitting communication device located within a predetermined distance from said signal-generating unit; a radio-frequency detector configured to detect said response signal; an occupancy/vacancy signal generating device configured to determine occupancy and/or vacancy condition in response to the result of a detection of said response signal; and a load control device connected between an electrical power source and an electrical load and configured to control the current supplied to said electrical load in response to a signal generated by said occupancy/vacancy signal generating device, wherein said radio-frequency detector is provided with a radio frequency shielding structure configured for blocking signals arriving from predetermined unwanted directions. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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Specification