Constant current actuator for inductive load
US4884160A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 10, 1989 |
| Grant date | Nov 28, 1989 |
| Priority date | — |
| Expiry date | Mar 10, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H47/32
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An actuator circuit for an inductive load includes a first low impedence source of direct current at a relatively high voltage, a second low impedance source at a lower voltage, a switching arrangement responsive to an input signal for connecting a load across the first source at the beginning of the signal and for a predetermined initiating interval thereafter, and at the end of the interval switching the load from the first to the second source, and a feedback control for limiting the current through the load to a first, constant value during the initiating interval and to second, lower constant value thereafter. The circuit cuts off the load when the input signal ceases or it removed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.