Relay device
US11056303B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 2016 |
| Grant date | Jul 6, 2021 |
| Priority date | — |
| Expiry date | Mar 12, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J2207/50
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A relay device includes a controller, a capacitor included in a charger, and a discharge circuit that discharges electric charge charged to the capacitor. The discharge circuit includes a discharge resistance, a first relay switch connected to the discharge resistance and having a contact point that becomes a closed state by electric conduction to an exciting coil, and a second relay switch connected in parallel to the first relay switch and having a contact point that becomes an open state by electric conduction to an exciting coil. The controller, by mutually switching between a state in which the first relay switch is turned on and the second relay switch is turned off and a state in which the first relay switch is turned off and the second relay switch is turned on, determines abnormality of the first relay switch and the second relay switch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.