Controlling a controllably conductive device based on zero-crossing detection
US11935714B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 1, 2023 |
| Grant date | Mar 19, 2024 |
| Priority date | — |
| Expiry date | Jan 1, 2043 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H9/56
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A load control device may control power delivered to an electrical load from an AC power source. The load control device may include a controllably conductive device adapted to be coupled in series electrical connection between the AC power source and the electrical load, a zero-cross detect circuit configured to generate a zero-cross signal representative of the zero-crossings of an AC voltage. The zero-cross signal may be characterized by pulses occurring in time with the zero-crossings of the AC voltage. The load control device may include a control circuit operatively coupled to the controllably conductive device and the zero cross detect circuit. The control circuit may be configured to identify a rising-edge time and a falling-edge time of one of the pulses of the zero-cross signal, and may control a conductive state of the controllably conductive device based on the rising-edge time and the falling-edge time of the pulse.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.