AC power line signaling system
Patent 4746809 Issued on May 24, 1988. Estimated Expiration Date: 
October 30, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 30, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3670182 3922563 Remote switching system Appliance control Apparatus for controlling power application Method and apparatus, for power line communications using zero crossing load interruption Patent #: 4300126 InventorsAssigneeApplicationNo. 06/925076 filed on 10/30/1986US Classes:307/1, SUPERIMPOSED UNLIKE CURRENTS307/3, Different frequencies or phase340/310.14Zero crossingExaminersPrimary: Shoop, William M. Jr.Assistant: Logan, Sharon D. Attorney, Agent or FirmInternational ClassesH05B 37/02 (20060101)H02J 13/00 (20060101) AbstractA system for controlling the operation of a load circuit coupled to an AC power distribution circuit includes an encoder which may be mounted in a wall switch box and coupled to a single conductor of the AC power distribution circuit for imposing thereon control signals by lengthening the zero crossings of the AC voltage. A decoder, also connected to the AC power distribution circuit at a remote location, detects the lengthened zero crossings and closes an electronic switch for energizing the load circuit. The encoder may be disconnected from the AC power distribution circuit, in which case the load circuit may be controlled by an external condition responsive device, such as a passive IR sensor. Visible light-responsive means may be provided for disabling the IR sensor during the day. The load circuit and the decoder can be turned off from the encoder location. | |
