Patent ID: 11903105
Assignee: LEVITON MANUFACTURING CO., INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 16:
17. A method of operating an electrical load controller, the method comprising:
predetermining a duration of time based at least in part on a frequency of an alternating current (AC) waveform, the alternating current (AC) waveform oscillating though full cycles, each full cycle comprising a positive half cycle and a negative half cycle;
selecting a detection window of time equal in duration to the predetermined duration of time, the selected detection window extending from a selected first time to a selected second time and straddling an expected time of a next zero-crossing of the AC waveform;
monitoring a zero-crossing signal for a zero-crossing indication, of the next zero-crossing, occurring within the selected detection window;
ascertaining a time of the next zero-crossing based on the monitoring; and
selectively controlling a supply of AC power to a load, wherein the controlling uses the ascertained time of the next zero-crossing of the AC waveform to fire a switching circuit of the electrical load controller.