Optically isolated solid state relay
US4408131A · kind A · utility
10Cited by
3References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 21, 1981 |
| Grant date | Oct 4, 1983 |
| Priority date | — |
| Expiry date | Sep 21, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/785
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A solid state relay is provided with a control logic circuit which receives a low level input control signal and controls a power field effect transistor (FET) switching element by means of an optical isolator. Connecting an external power source to a function selecting input terminal causes the relay to operate as a normally open, normally closed, or latching relay. A voltage spike suppression network protects the FET from voltage spikes appearing across it.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.