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US 10,473,486 B2Granted
Duty cycle of an output signal of a magnetic field sensor to detect speed and direction of angular rotation of a rotating magnetic structure or a fault
AssigneeAllegro MicroSystems, LLC
InventorsMichael C. Doogue, P. Karl Scheller
Life of this patent
Estimating the term…
Abstract
In one aspect, an integrated circuit (IC) includes a magnetic field sensor to detect speed and direction of angular rotation of a rotating magnetic structure. The magnetic field sensor includes at least two magnetic field sensing elements configured to sense changes in a magnetic field caused by rotation of the magnetic structure. The IC also includes an output port configured to provide an output signal of the magnetic field sensor. A duty cycle percentage of the output signal indicates the speed and the direction or indicates a fault.
Claims28
An integrated circuit (IC) comprising:
- a magnetic field sensor to detect speed and direction of angular rotation of a rotating magnetic structure, the magnetic field sensor comprising:
- at least two magnetic field sensing elements configured to sense changes in a magnetic field caused by rotation of the magnetic structure;
- an output port configured to provide an output signal of the magnetic field sensor, a duty cycle percentage of the output signal indicating the speed,
- wherein the duty cycle percentage of the output signal being between a first value and a second value indicates the magnetic structure rotating in a first direction,
- wherein the duty cycle percentage being between a third value and a fourth value indicates the magnetic structure rotating in a second direction opposite the first direction,
- wherein the duty cycle percentage indicates one or more faults in response to the duty cycle percentage being at least one of:
- less than the first value,
- greater than the fourth value, or
- between the third value and the second value,
- wherein the first value is less than the second value, the second value is less than the third value and the third value is less than the fourth value.
7 more elements
An integrated circuit (IC) comprising:
- a magnetic field sensor means to detect speed and direction of angular rotation of a rotating magnetic structure, the magnetic field sensor means comprising:
- a means to sense changes in a magnetic field caused by rotation of the magnetic structure;
- an output port configured to provide an output signal of the magnetic field sensor means, a duty cycle percentage of the output signal indicating the speed,
- wherein a duty cycle percentage of the output signal being between a first value and a second value indicates the magnetic structure rotating in a first direction,
- wherein the duty cycle percentage being between a third value and a fourth value indicates the magnetic structure rotating in a second direction opposite the first direction,
- wherein the duty cycle percentage indicates one or more faults in response to the duty cycle percentage being at least one of:
- less than the first value,
- greater than the fourth value, or
- between the third value and the second value,
- wherein the first value is less than the second value, the second value is less than the third value and the third value is less than the fourth value.
7 more elements
A magnetic field sensor comprising:
- at least two magnetic field sensing elements configured to sense changes in a magnetic field caused by rotation of the magnetic structure;
- and
- an output port configured to provide an output signal of the magnetic field sensor, a duty cycle percentage of the output signal indicating a speed of rotation of the magnetic structure,
- wherein a duty cycle percentage of the output signal being between a first value and a second value indicates the magnetic structure rotating in a first direction,
- wherein the duty cycle percentage being between a third value and a fourth value indicates the magnetic structure rotating in a second direction opposite the first direction,
- wherein the duty cycle percentage indicates one or more faults in response to the duty cycle percentage being at least one of:
- less than the first value,
- greater than the fourth value, or
- between the third value and the second value,
- wherein the first value is less than the second value, the second value is less than the third value and the third value is less than the fourth value.
7 more elements
Dependencies are inferred from the claim text.