Ground fault protection circuit
US8018697B2 · kind B2 · utility
2Cited by
4References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 7, 2007 |
| Grant date | Sep 13, 2011 |
| Priority date | — |
| Expiry date | Jan 31, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H9/56
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A switching circuit, e.g. an RCD, comprises a pair of mechanical contacts (M) in an alternating current electricity supply (N, L) and circuit means (SCR) for opening the contacts to cut off the supply in response to a switching signal (S). The switching circuit includes further circuit means (Rs, Cs, D2, D3, Q1, Q2) for defining successive periods of time (“activation windows”) during which the magnitude of the supply voltage is not at a maximum and allowing the contacts to open in response to a switching signal only during such windows.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.