Patent ID: 11948739
Assignee: CIRRUS LOGIC INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 5:
6. A method comprising:
selecting one of a first coil and a second coil for driving mechanical displacement of an electromagnetic actuator, wherein the first coil is configured to drive mechanical displacement of the electromagnetic actuator and the second coil is configured to drive mechanical displacement of the electromagnetic actuator;
selecting the other of the first coil and the second coil as a sensing coil for sensing displacement of the electromagnetic actuator;
determining a displacement of the electromagnetic actuator based on a measurement of estimated impedance of the sensing coil; and
when switching selection of the sensing coil from the first coil to the second coil:
determining the displacement of the first coil based on a measured impedance of the first coil at approximately the time of switching selection;
estimating state variables of the impedance sensing path to be used with the second coil based on the displacement; and

applying the state variables to the impedance sensing path after switching selection of the sensing coil from the first coil to the second coil.