Back to results
US 6,661,635 B1Granted
Electronic drive control apparatus
AssigneeMoeller GmbH
InventorWolfgang Meid
Life of this patent
Estimating the term…
Abstract
An electronic drive control used for controlling a drive coil of a contactor during holding operation with a pulse-width modulation. The interval time for the pulse-width modulation is temporally changed or the pulse-width ratio is continuously changed. The invention may minimize the holding power in the case of high voltages without the occurrence of problems associated with EMC and without reducing the functional reliability.
Claims6
An apparatus for electronically controlling a drive coil of a contractor in a holding mode using a pulse-width modulation, comprising:
- an oscillator configured for generating an AC voltage;
- and
- a mixer configured for superposing a periodic output signal of the oscillator with an input variable associated with an input voltage so as to generate a pulse-width signal;
- wherein an interval time for the pulse-width modulation is varied in time or the pulse width ratio is continuously changed.
1 more element
Dependencies are inferred from the claim text.