초록 ▼

A load control system controls an electrical load provided in a space and comprises a load control device and one or more occupancy sensors. The load control device controls the load in response to the wireless control signals received from the occupancy sensors. Each occupancy sensor transmits an o

A load control system controls an electrical load provided in a space and comprises a load control device and one or more occupancy sensors. The load control device controls the load in response to the wireless control signals received from the occupancy sensors. Each occupancy sensor transmits an occupied control signal to the load control device in response to detecting an occupancy condition in the space and a vacant control signal to the load control device in response to detecting a vacancy condition. The load control device turns on the load in response to receiving the occupied control signal from at least one of the occupancy sensors, and turns off the load in response to receiving vacant control signals from both of the occupancy sensors. The load control device is operable to determine that no wireless control signals have been received from the occupancy sensors for the length of a predetermined timeout period and to subsequently turn off the load.

대표청구항 ▼

What is claimed is: 1. A radio-frequency load control system with occupancy sensing comprising:a load control device connected between an AC power source and an electrical load, said load control device containing an RF receiver circuit for receiving radio frequency signals; andfirst and second batt

What is claimed is: 1. A radio-frequency load control system with occupancy sensing comprising:a load control device connected between an AC power source and an electrical load, said load control device containing an RF receiver circuit for receiving radio frequency signals; andfirst and second battery-powered occupancy sensors, each occupancy sensor fixable to a surface of a room in which said electrical load is located for transmitting an RF signal in response to the presence of an occupant in said room, said second occupancy sensor spaced from the location of said first occupancy sensor, each occupancy sensor comprising an enclosed plastic housing including at least one battery, a detector for sensing the presence or absence of occupants in said room, and a RF transmitter circuit for producing said RF signal which is modulated to indicate the presence or absence of said occupant in said room, the RF signals of said occupancy sensors having respective identifying information to identify themselves to the load control device;wherein said load control device receives said RF signals transmitted by said occupancy sensors and controls the current supplied to said electrical load in a predetermined dependence on the detection of an occupancy or a vacancy in said room.