Patent ID: 11871493
Assignee: LEVITON MANUFACTURING CO., INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method of operating an electrical load controller for controlling conduction of a supply of alternating current (AC) power to a load, the supply of AC power having an input AC waveform that is input to the electrical load controller at a line input terminal of the electrical load controller, the input AC waveform comprising zero-crossings between positive and negative half-cycles of the input AC waveform, the method comprising:
obtaining at least one time offset, the at least one time offset representing amounts of time between (i) zero-crossings of an input signal waveform, representative of the input AC waveform, at an input of a zero-crossing detector circuit of the electrical load controller and (ii) corresponding transitions of an output signal from an output of the zero-crossing detector circuit to a microcontroller of the electrical load controller, each of the corresponding transitions corresponding to a respective zero-crossing of the zero-crossings of the input signal waveform and indicating a respective zero-crossing of the input AC waveform; and
determining times of the zero-crossings of the input AC waveform, the determining the times of the zero-crossings of the input AC waveform comprising:
determining times of the corresponding transitions as detected by the microcontroller; and
adjusting the determined times of the corresponding transitions to produce the times of the zero-crossings of the input AC waveform, wherein the adjusting uses the at least one time offset.