Load control device having stuck relay detection
US10566161B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 14, 2019 |
| Grant date | Feb 18, 2020 |
| Priority date | — |
| Expiry date | Jun 14, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2047/003
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A load control device (e.g., a switching device) for controlling power delivered from an AC power source to an electrical device (e.g., a lighting load) may be configured to detect that a relay is stuck closed and attempt to fix the relay. The relay of the load control device may be adapted to be coupled between the source and the electrical device to control the power delivered to the electrical device so as to generate a switched-hot voltage. The load control device may comprise a detect circuit configured to generate a detect signal indicating a magnitude of the switched-hot voltage, and a control circuit configured to monitor the detect signal. The control circuit may be configured to determine that the relay is stuck closed in response to the detect signal, and to control the relay in order to attempt to fix the relay by repeatedly closing and opening the relay.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.