Local time determination via daylight sensing for programmable control devices
US12393222B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 2023 |
| Grant date | Aug 19, 2025 |
| Priority date | — |
| Expiry date | Jan 1, 2044 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/40
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Programmable control devices that rely on time-of-day accuracy maintain that accuracy by determining their location via a global positioning system, recording and timestamping continually measured ambient light via a daylight sensor and real-time clock (RTC) of the programmable control device, determining a mid-darkness time point, comparing that mid-darkness time point with a reference mid-darkness time point for the same location for the same day of the year, and then adjusting the RTC of the programmable control device as necessary. Methods of maintaining time of day in a programmable control device are also provided, as are other aspects.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.