AC powered electrical control device with logic level control
US5486972A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 30, 1993 |
| Grant date | Jan 23, 1996 |
| Priority date | — |
| Expiry date | Dec 30, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H47/325
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The coil of an electric control device is energized by ac power controlled by a remotely generated logic level signal through a control module mounted in a cavity in the exterior of the device housing. The module contains a pair of back-to-back silicon controlled rectifiers (SCRs) mounted on a finned aluminum wall of the module which serves as a heat sink. An opto-coupler comprising a light emitting diode (LED) energized by the logic level signal and an opto-triac in series with resistors connected across the gates and cathodes of the back-to-back SCRs provides electrically isolated control of the conduction angles of the SCRs by the logic level signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.