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

Claim 5:
6. The method of claim 1, wherein the zero-crossings of the input AC waveform comprise positive-going zero-crossings of the input AC waveform and negative-going zero-crossings of the AC waveform, wherein the zero-crossing detector circuit is configured to detect the positive-going zero-crossings of the input AC waveform based on voltage of the input signal waveform transitioning through a first threshold voltage and the zero-crossing detector circuit is configured to detect the negative-going zero-crossings of the input AC waveform based on voltage of the input signal waveform transitioning through a second threshold voltage, wherein the at least one time offset comprises:
a positive-going time offset representing amounts of time between (i) zero-crossings of the input signal waveform indicative of the positive-going zero-crossings of the input AC waveform and (ii) a first group of transitions of the corresponding transitions of the output signal from the output of the zero-crossing detector circuit, each transition of the first group of transitions indicating a respective positive-going zero-crossing of the input AC waveform; and
a negative-going time offset representing amounts of time between (i) zero-crossings of the input signal waveform indicative of the negative-going zero-crossings of the input AC waveform and (ii) a second group of transitions of the corresponding transitions of the output signal from the output of the zero-crossing detector circuit, each transition of the second group of transitions indicating a respective negative-going zero-crossing of the input AC waveform;
wherein the adjusting the determined times of the corresponding transitions to produce the times of the zero-crossings of the input AC waveform comprises:
adjusting the determined times of the first group of transitions using the positive-going time offset to produce the times of the positive-going zero-crossings of the input AC waveform; and
adjusting the determined times of the second group of transitions using the negative-going time offset to produce the times of the negative-going zero-crossings of the input AC waveform.