Remote AC power control with control pulses at the zero crossing of the AC wave
Patent 4328482 Issued on May 4, 1982. Estimated Expiration Date: 
January 21, 2001. 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.
January 21, 2001. 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 2476990 2999925 3488517 3594584 3689886 3714451 Control system employing a programmable multiple channel controller for transmitting control signals over electrical power lines Patent #: 4060735 InventorsAssigneeApplicationNo. 06/226936 filed on 01/21/1981US Classes:340/310.12, Modulation technique307/108, With capacitor307/140, Power circuit controlled340/310.14, Zero crossing340/825.57Pulse responsive actuationExaminersPrimary: Groody, James J.Attorney, Agent or FirmInternational ClassesH04B 3/54 (20060101)H02J 13/00 (20060101) AbstractA remote control for the control of AC power uses the AC power wave of an existing AC power line for the transmitting control signals from a control location to a remote location. A transmitter at the control location provides a predetermined number of control pulses to the AC power line and includes at least one breakdown device and at least one capacitor in series across the AC power line. The actuation of the transmitter provides triggering of the one or more breakdown devices at at least one peak point of the AC power wave and with the triggering corresponding to the predetermined number of control pulses for providing a charging of the one or more capacitors substantially to one half of the peak to peak value of the AC power wave at the predetermined number of points and triggering of the one or more breakdown devices at the zero crossing points of the AC power wave to discharge the one or more capacitors to provide high frequency pulses having amplitudes substantially equal to one half of the peak to peak value of the AC power wave. A receiver at the remote location includes a detector which is enabled only at the zero crossing points so as to detect the presence of the control pulses only at that time. | |
