Electrical switching circuit
US7781918B2 · kind B2 · utility
2Cited by
6References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 9, 2006 |
| Grant date | Aug 24, 2010 |
| Priority date | — |
| Expiry date | Oct 31, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H9/542
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Electrical switch circuitry including a relay with contacts and a transistor. A control circuit switches the transistor ON in response to a voltage difference across the relay contacts reaching a predetermined value, such that in use, electrical current is caused to flow through the transistor while the electrical contacts of the relay are closing or opening. This reduces electrical arcing across the contacts of the relay.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.