Radio-frequency lighting control system with occupancy sensing
First Claim
1. A load control system for controlling the amount of power delivered from an AC power source to an electrical load provided in a space having a movable structure and a fixed surface, the load control system comprising:
- a load control device adapted to be coupled in series electrical connection between the AC power source and the electrical load for control of the amount of power delivered to the electrical load, the load control device operable to receive wireless control signals and to control the amount of power delivered to the electrical load in response to the wireless control signals;
a first occupancy sensor adapted to be mounted to the movable structure, the first occupancy sensor operable to detect movement of the movable structure and to transmit a first occupied wireless control signal to the load control device in response to detecting the movement of the movable structure, the load control device operable to enable the delivery of power to the electrical load in response to receiving the first occupied wireless control signal; and
a second occupancy sensor adapted to be mounted to the fixed surface, the second occupancy sensor operable to detect an occupancy condition in the space and to transmit a second occupied wireless control signal to the load control device in response to detecting the occupancy condition;
wherein each of the occupancy sensors is operable to transmit a vacant wireless control signal to the load control device in response to detecting a vacancy condition in the space, the load control device operable to cease the delivery of power to the electrical load in response to receiving the vacant wireless control signals from both of the occupancy sensors;
wherein each of the occupancy sensors is operable to transmit a third wireless control signal to the load control device in response to detecting a continued occupancy condition in the space, the load control device ceasing the delivery of power to the electrical load in response to determining that no wireless control signals have been received from one of the occupancy sensors for the length of a predetermined timeout period, and receiving a vacant control signal from the other occupancy sensor;
wherein the load control device initializes a failsafe timer with the predetermined timeout period and restarts the failsafe timer in response to receiving the third wireless control signals from the occupancy sensors, the load control device operable to cease the delivery of power to the electrical load when the failsafe timer expires; and
wherein the first occupied wireless control signal comprises an occupied-take-action command, the second occupied wireless control signal comprises an occupied-take-action command and the third wireless control signal comprises an occupied-no-action command.
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Accused Products
Abstract
A load control system controls an electrical load provided in a space and comprises a load control device and a first occupancy sensor mounted to a movable structure (e.g., a door) and a second occupancy sensor mounted to a fixed surface (e.g., a wall or a ceiling). The load control device controls the load in response to the wireless control signals received from the occupancy sensors. The first occupancy sensor transmits an occupied wireless control signal to the load control device in response to detecting the movement of the movable structure. The second occupancy sensor transmits an occupied wireless control signal to the load control device in response to detecting the occupancy condition. The load control device turns on the load in response to receiving the occupied control signal from the first occupancy sensor, and turns off the load in response to receiving vacant control signals from both of the occupancy sensors.
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Citations
17 Claims
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1. A load control system for controlling the amount of power delivered from an AC power source to an electrical load provided in a space having a movable structure and a fixed surface, the load control system comprising:
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a load control device adapted to be coupled in series electrical connection between the AC power source and the electrical load for control of the amount of power delivered to the electrical load, the load control device operable to receive wireless control signals and to control the amount of power delivered to the electrical load in response to the wireless control signals; a first occupancy sensor adapted to be mounted to the movable structure, the first occupancy sensor operable to detect movement of the movable structure and to transmit a first occupied wireless control signal to the load control device in response to detecting the movement of the movable structure, the load control device operable to enable the delivery of power to the electrical load in response to receiving the first occupied wireless control signal; and a second occupancy sensor adapted to be mounted to the fixed surface, the second occupancy sensor operable to detect an occupancy condition in the space and to transmit a second occupied wireless control signal to the load control device in response to detecting the occupancy condition; wherein each of the occupancy sensors is operable to transmit a vacant wireless control signal to the load control device in response to detecting a vacancy condition in the space, the load control device operable to cease the delivery of power to the electrical load in response to receiving the vacant wireless control signals from both of the occupancy sensors; wherein each of the occupancy sensors is operable to transmit a third wireless control signal to the load control device in response to detecting a continued occupancy condition in the space, the load control device ceasing the delivery of power to the electrical load in response to determining that no wireless control signals have been received from one of the occupancy sensors for the length of a predetermined timeout period, and receiving a vacant control signal from the other occupancy sensor; wherein the load control device initializes a failsafe timer with the predetermined timeout period and restarts the failsafe timer in response to receiving the third wireless control signals from the occupancy sensors, the load control device operable to cease the delivery of power to the electrical load when the failsafe timer expires; and wherein the first occupied wireless control signal comprises an occupied-take-action command, the second occupied wireless control signal comprises an occupied-take-action command and the third wireless control signal comprises an occupied-no-action command. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A load control system for controlling the amount of power delivered from an AC power source to an electrical load provided in a space having a door and a fixed surface, the load control system comprising:
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a load control device adapted to be coupled in series electrical connection between the AC power source and the electrical load for control of the amount of power delivered to the electrical load, the load control device operable to receive wireless control signals and to control the amount of power delivered to the electrical load in response to the wireless control signals; a first occupancy sensor adapted to be mounted to the door, the first occupancy sensor operable to detect movement of the door and to transmit a first occupied wireless control signal to the load control device in response to detecting the movement of the door, the load control device operable to enable the delivery of power to the electrical load in response to receiving the occupied wireless control signal from the first occupancy sensor; and a second occupancy sensor adapted to be mounted to the fixed surface, the second occupancy sensor operable to detect an occupancy condition in the space and to transmit a second occupied wireless control signal to the load control device in response to detecting the occupancy condition; wherein each of the occupancy sensors is operable to transmit a vacant wireless control signal to the load control device in response to detecting a vacancy condition in the space, the load control device operable to cease the delivery of power to the electrical load in response to receiving vacant control signals from both of the occupancy sensors; wherein each of the occupancy sensors is operable to transmit a third wireless control signal to the load control device in response to detecting a continued occupancy condition in the space, the load control device ceasing the delivery of power to the electrical load in response to determining that no wireless control signals have been received from one of the occupancy sensors for the length of a predetermined timeout period, and receiving a vacant control signal from the other occupancy sensor; wherein the load control device initializes a failsafe timer with the predetermined timeout period and restarts the failsafe timer in response to receiving the third wireless control signals, the load control device operable to cease the delivery of power to the electrical load when the failsafe timer expires; and wherein the first occupied wireless control signal comprises an occupied-take-action command, and the third wireless control signal comprises an occupied-no-action command.
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16. A method of controlling the amount of power delivered from an AC power source to an electrical load provided in a space having a movable structure and a fixed surface, the method comprising the steps of:
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mounting a first occupancy sensor on the movable structure; mounting a second occupancy sensor on the fixed surface; the first occupancy sensor detecting movement of the movable structure; the first occupancy sensor transmitting a first occupied wireless control signal in response to detecting the movement of the movable structure; enabling the delivery of power to the electrical load in response to receiving the first occupied wireless control signal from the first occupancy sensor; the second occupancy sensor detecting an occupancy condition in the space; the second occupancy sensor transmitting a second occupied wireless control signal in response to detecting the occupancy condition in the space; the first and second occupancy sensors each detecting a vacancy condition in the space; the first and second occupancy sensors each transmitting a vacant wireless control signal in response to detecting the vacancy condition in the space; and ceasing the delivery of power to the electrical load in response to receiving vacant control signals from both of the occupancy sensors;
further whereineach of the occupancy sensors transmitting a third wireless control signal in response to detecting a continued occupancy condition in the space; ceasing the delivery of power to the electrical load in response to determining that no wireless control signals have been received from one of the occupancy sensors for the length of a predetermined timeout period, and either receiving a vacant control signal from the other occupancy sensor, or determining that no wireless control signals have been received from the other occupancy sensor for the length of the timeout period; initializing a failsafe timer with the predetermined timeout period and restarting the failsafe timer in response to receiving the third wireless control signals from the occupancy sensors; ceasing the delivery of power to the electrical load when the failsafe timer expires; and wherein the first occupied wireless control signal comprises an occupied-take-action command, and the third wireless control signal comprises an occupied-no-action command. - View Dependent Claims (17)
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Specification