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US 12,571,625 B2Granted
Self-correcting inductive sensor
AssigneeSemiconductor Components Industries, LLC
InventorJacques Jean Bertin
Life of this patent
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Abstract
A sensor subsystem is disclosed. The sensor subsystem includes a sensor coupled to an interface circuit. The sensor may generate a fine sensor signal and a coarse sensor signal based on a rotation of the sensor. The interface circuit may generate first and second absolute angle values based on the fine and coarse sensor signals, respectively. The interface circuit may additionally generate an output angle value using a difference between the first and second absolute angle values.
Claims20
An apparatus, comprising:
- a sensor configured to generate a fine sensor signal and a coarse sensor signal based on a rotation of the sensor;
- and
- an interface circuit that includes a lookup table configured to store a plurality of average error values for a corresponding plurality of angle ranges, wherein the interface circuit is configured to:
- generate a first absolute angle value using the fine sensor signal and the coarse sensor signal, wherein a first most significant portion of the first absolute angle value is based on the fine sensor signal;
- generate a second absolute angle value using the coarse sensor signal and the fine sensor signal, wherein a second most significant portion of the second absolute angle value is based on the coarse sensor signal;
- retrieve a particular average error value from the lookup table using one of the first absolute angle value or the second absolute angle value;
- and
- generate an output angle value using the particular average error value, and a difference between the first absolute angle value and the second absolute angle value.
5 more elements
A method, comprising:
- generating, by a sensor, a fine sensor signal based on a rotation of the sensor;
- generating, by the sensor, a coarse sensor signal based on the rotation of the sensor, wherein a resolution of the coarse sensor signal is less than a resolution of the fine sensor signal;
- generating, by an interface circuit, a first absolute angle value using the fine sensor signal and the coarse sensor signal, wherein a first most significant portion of the first absolute angle value is based on the fine sensor signal;
- generating, by the interface circuit, a second absolute angle value using the coarse sensor signal and the fine sensor signal, wherein a second most significant portion of the second absolute angle value is based on the coarse sensor signal;
- retrieving, by the interface circuit using the first absolute angle value, a particular average error value from a lookup table configured to store a plurality of average error values for a corresponding plurality of fine angle ranges;
- and
- generating, by the interface circuit, an output angle value using the particular average error value, and a difference between the first absolute angle value and the second absolute angle value.
4 more elements
A system, comprising:
- a mechanical device that includes a component configured to rotate based on a control signal;
- a sensor subsystem that includes a lookup table configured to store a plurality of average error values for a corresponding plurality of angle ranges, wherein the sensor subsystem is configured to:
- generate a fine sensor signal based on a position of the component;
- generate a coarse sensor signal based on the position of the component;
- generate a first absolute angle value using the fine sensor signal and the coarse sensor signal, wherein a first most significant portion of the first absolute angle value is based on the coarse sensor signal;
- generate a second absolute angle value using the coarse sensor signal and the fine sensor signal, wherein a second most significant portion of the second absolute angle value is based on the fine sensor signal;
- retrieve, from the lookup table using the first absolute angle value, a particular average error value;
- and
- generate a rotation angle using the particular average error value, and a difference between the first absolute angle value and the second absolute angle value;
- and
- a control circuit configured to generate the control signal using an input signal and the rotation angle.
8 more elements
Dependencies are inferred from the claim text.