Circuit device
US6262874A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 4, 1998 |
| Grant date | Jul 17, 2001 |
| Priority date | — |
| Expiry date | Sep 4, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F7/1805
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A circuit device for the regulation of the coil current flowing through a solenoid coil arrangement is proposed. It comprises a regulating means having a measuring arrangement for measuring the coil current and adapted to regulate the coil current in a manner dependent on the measured coil amperage, means for producing a attraction current, which regulated by clock pulse switching, flowing through the solenoid coil arrangement and a switching over means for reducing the coil current after elapse of an attraction time to a lower clock pulse switched hold current flowing until the end of a switch signal. The measuring arrangement is switched outside the freewheel circuit in which during the freewheel condition, existing in clock pulse switching intervals, of the solenoid coil arrangement the freewheel current flows. This means that the input voltage does not have to be adapted to the desired attraction current and the freewheel current does not produce any power loss in the measurement arrangement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.