Contactor interlock circuits
US3963967A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 21, 1974 |
| Grant date | Jun 15, 1976 |
| Priority date | — |
| Expiry date | Nov 21, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H47/32
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A thyristor pulse controller having an electromagnetically actuated shorting contactor comprising an actuating coil and an armature which moves on energization of the actuating coil to close the contactor tips and which moves on de-energization of the coil to open the contactor tips and to create an air-gap in the magnetic circuit of the coil, is provided with an interlock circuit comprising a voltage sensing circuit connected in parallel with the contactor actuating coil, the voltage sensing circuit being adapted to provide an output signal when the modulus of the voltage across the actuating coil exceeds a predetermined value which is lower than the modulus of the voltage across the coil at the instant when the contactor tips open. A unidirectional current path, which may be provided by the interlock circuit itself, is connected across the actuating coil to discipate inductive energy in the coil when the contactor opens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.