Detecting welded relay contacts using contact close time measurement
US12416672B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 21, 2023 |
| Grant date | Sep 16, 2025 |
| Priority date | — |
| Expiry date | Nov 12, 2043 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2300/054
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A system includes a relay system and a controller. The relay system includes a plurality of relays. The controller is configured to transmit a close signal to a first relay and a second relay of the plurality of relays. The close signal is configured to close the first contact and the second contact of each of the first relay and the second relay. The controller is also configured to measure a first close time between the transmission of the close signal to the first relay and a time when the first relay closes, and to measure a second close time between the transmission of the close signal to the second relay and a time when the second relay closes. The controller is further configured to determine whether an electrical weld exists in the first relay or the second relay, based on the first and second close times.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.