Control circuit for an electromagnet
First Claim
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1. A control circuit comprising:
- an electromagnet comprising a first coil and a second coil to determine a call phase and a hold phase;
a capacitor coupled to the first coil;
a current generator configured to power the coils and to charge the capacitor;
a first switch coupled to the first coil;
a second switch coupled to the first coil and the second coil, wherein the current generator powers the second coil via the second switch during the call phase and the hold phase; and
a control device configured to control the first switch and the second switch, wherein the second switch controls discharge of the capacitor into the first coil during the call phase.
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Abstract
Control circuit for electromagnet with two coils used to determine a call phase and a hold phase, and powered from a DC power source. The energy source comprises a current generator and a capacitor powered by this current generator. A control device controls two switches, in which the first switch controls discharge of the capacitor in the first coil during the call phase, and the second switch sets up current passing through a second coil during the call phase and the hold phase. The required current output from the current generator is thus reduced.
6 Citations
6 Claims
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1. A control circuit comprising:
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an electromagnet comprising a first coil and a second coil to determine a call phase and a hold phase; a capacitor coupled to the first coil; a current generator configured to power the coils and to charge the capacitor; a first switch coupled to the first coil; a second switch coupled to the first coil and the second coil, wherein the current generator powers the second coil via the second switch during the call phase and the hold phase; and a control device configured to control the first switch and the second switch, wherein the second switch controls discharge of the capacitor into the first coil during the call phase. - View Dependent Claims (2, 3, 4)
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5. A method for controlling an electromagnet having a first coil and a second coil to determine a call phase and a hold phase, the method comprising:
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powering the coils by a current generator; charging a capacitor by the current generator; and switchably controlling discharge of the capacitor into the first coil during the call phase, wherein the controlling step comprises; opening a first switch, and closing a second switch concurrent with the opening step, wherein the second switch is coupled to the first coil and the second coil. - View Dependent Claims (6)
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Specification