System for controlling an electromagnetic device
US6633478B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 18, 2001 |
| Grant date | Oct 14, 2003 |
| Priority date | — |
| Expiry date | Feb 16, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H47/325
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A control circuit is provided for use in an electromagnetic device with a coil where the electromagnetic device is actuated with an actuating current and held in an operative condition by a holding current with the holding current being significantly lower in magnitude than the actuating current. The control circuit includes first and second transistors wherein, during a powered mode, the first transistor is disposed in an on state and the second transistor is disposed in an off state, and, during a shorted mode, the first transistor is disposed in an off state and the second transistor is disposed in an on state. Additionally, a power source selectively communicates with the coil, and during a first time interval, the power source communicates with the coil in the powered mode and, during a second time interval, the power source is disconnected from the coil in the shorted mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.