CONTROL APPARATUS FOR A SWITCHING DEVICE WITH A PULL-IN COIL AND/OR A HOLDING COIL AND METHOD FOR CONTROLLING THE CURRENT FLOWING THROUGH THE COIL
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United States of America Patent
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Issued Date -
Nov 18, 2010
app pub date -
Apr 12, 2008
filing date -
Jul 9, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A control apparatus for a switching device including a contactor drive and a coil includes a pulse width-controlled switching mechanism connected to a coil and a control unit connected to the switching mechanism. The control unit is configured to generate a control signal having an adjustable pulse width and set the adjustable pulse width as a function of an input voltage signal so as to maintain a current through the coil approximately constant. The control unit is further configured to determine a voltage of the control apparatus by determining an instantaneous coil voltage of the coil and adjusting a current pulse width modulation turn-on time in accordance with the instantaneous coil voltage using at least one data processing unit.
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