Method and circuit for muting electromagnetic interference during maneuvering of a device
First Claim
1. A method for controlling an electrical current of an electrical coil, comprising:
- for the electrical coil connected to a voltage source via a switching circuit, transitioning a state of the switching circuit between,a current control mode of operation in which the switching circuit alternates a voltage polarity of the voltage source to thereby control a magnitude and direction of an electrical current of the electrical coil, anda current hold mode of operation in which the switching circuit disconnects the electrical coil from the voltage source and short-circuits the electrical coil to maintain the magnitude and direction of the electrical current of the electrical coil at a transition time between the current control mode and the current hold mode.
2 Assignments
0 Petitions
Accused Products
Abstract
A switching circuit includes a first switch and a second switch respectively connecting a first terminal and a second terminal of an electrical coil to a positive terminal of a voltage source, a third switch and a fourth switch respectively connecting the first terminal and the second terminal of the electrical coil to a negative terminal of the voltage source, and a controller to control the switching circuit in a current control mode to alternate a voltage polarity of the voltage source to thereby control a magnitude and direction of the electrical current of the electrical coil, and to control the switching circuit in a current hold mode to disconnect the electrical coil from the voltage source and to short-circuit the electrical coil to maintain the magnitude and direction of the electrical current at the transition time when the switching circuit switched to the current hold mode.
20 Citations
17 Claims
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1. A method for controlling an electrical current of an electrical coil, comprising:
for the electrical coil connected to a voltage source via a switching circuit, transitioning a state of the switching circuit between, a current control mode of operation in which the switching circuit alternates a voltage polarity of the voltage source to thereby control a magnitude and direction of an electrical current of the electrical coil, and a current hold mode of operation in which the switching circuit disconnects the electrical coil from the voltage source and short-circuits the electrical coil to maintain the magnitude and direction of the electrical current of the electrical coil at a transition time between the current control mode and the current hold mode. - View Dependent Claims (2, 3, 4, 5)
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6. A method for controlling an electrical current state of an electrical coil, comprising:
for the electrical coil connected to a voltage source via a switching circuit, controlling, during a first period, the switching circuit to alternate a voltage polarity of the voltage source provided to the electrical coil, to thereby control a magnitude and direction of the electrical current of the electrical coil; and controlling, during a second period different from the first period, the switching circuit to disconnect the electrical coil from the voltage source and to short-circuit the electrical coil to maintain the magnitude and direction of the electrical current at the end of the first period. - View Dependent Claims (7, 8, 9)
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10. A system for controlling an electrical current of an electrical coil, comprising:
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a switching circuit comprising; a first switch and a second switch respectively interposed between a first terminal and a second terminal of the electrical coil and a positive terminal of a voltage source powering the electrical coil; a third switch and a fourth switch respectively interposed between the first terminal and the second terminal of the electrical coil and a negative terminal of the voltage source; and a controller to switch the switching circuit between a current control mode and a current hold mode, said controller configured to; control the switching circuit during a period of the current control mode to alternate a voltage polarity of the voltage source to thereby control a magnitude and direction of the electrical current of the electrical coil, and control the switching circuit during a period of the current hold mode to disconnect the electrical coil from the voltage source and to short-circuit the electrical coil to maintain the magnitude and direction of the electrical current at the time when the controller switches the switching circuit from the current control mode to the current hold mode. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification