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US 7,714,570 B2Granted
Methods and apparatus for an analog rotational sensor having magnetic sensor elements
AssigneeAllegro MicroSystems, LLC
InventorsMonica J. Thomas, Michael C. Doogue, Hooman Bustani
Life of this patent
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Abstract
Methods and apparatus for a sensor include a signal generation module including a first magnetic sensor to generate a first waveform in the form of a sine wave and a second magnetic sensor to generate a second waveform in the form of a cosine wave, the first and second waveforms containing angular position information of a magnet in relation to the first and second magnetic sensors, and an analog signal processing module for providing an algebraic manipulation of the first waveform and the second waveform to generate a linear position output voltage signal.
Claims26
A sensor, comprising:
- a signal generation module including a first magnetic sensor to generate a first waveform in the form of a sine wave and a second magnetic sensor to generate a second waveform in the form of a cosine wave, the first and second waveforms containing angular position information of a magnet in relation to the first and second magnetic sensors;
- an analog signal processing module for providing an algebraic manipulation of the first waveform and the second waveform to generate a linear position output voltage signal;
- and
- a signal inversion module coupled to the signal generation module for inverting the first waveform to provide a first inverted waveform and for inverting the second waveform to provide a second inverted waveform, wherein the signal inversion module outputs the first and second waveforms in a first region spanning a first range of angular position of the magnet and outputs the first and second inverted waveforms in a second region spanning a second range of angular position of the magnet,
- wherein an output of the sensor is defined by
- output
- =
- A
-
-
- sin
-
- (
- θ
- )
- A
-
-
- cos
-
- (
- θ
- )
- ±
- Ab
- ,
- wherein A is an amplitude of the first and second waveforms, b is a constant and θ indicates an angle of a rotating magnet in the magnetic sensor.
24 more elements
A sensor, comprising:
- a signal generation module including a first magnetic sensor to generate a first waveform in the form of a sine wave and a second magnetic sensor to generate a second waveform in the form of a cosine wave, the first and second waveforms containing angular position information of a magnet in relation to the first and second magnetic sensors;
- an analog signal processing module for providing an algebraic manipulation of the first waveform and the second waveform to generate a linear position output voltage signal;
- and
- a signal inversion module coupled to the signal generation module for inverting the first waveform to provide a first inverted waveform and for inverting the second waveform to provide a second inverted waveform, wherein the signal inversion module outputs the first and second waveforms in a first region spanning a first range of angular position of the magnet and outputs the first and second inverted waveforms in a second region spanning a second range of angular position of the magnet,
- wherein the first region corresponds to sin(θ) > cos(θ) where sin(θ) refers to the inversion of the sine wave about an offset voltage, sin(θ) and cos(θ) embody the amplitudes and offsets associated with the sinusoids, and θ indicates an angle of a rotating magnet in the magnetic sensor.
2 more elements
A sensor, comprising:
- a signal generation module including a first magnetic sensor to generate a first waveform in the form of a sine wave and a second magnetic sensor to generate a second waveform in the form of a cosine wave, the first and second waveforms containing angular position information of a magnet in relation to the first and second magnetic sensors;
- an analog signal processing module for providing an algebraic manipulation of the first waveform and the second waveform to generate a linear position output voltage signal;
- and
- a signal inversion module coupled to the signal generation module for inverting the first waveform to provide a first inverted waveform and for inverting the second waveform to provide a second inverted waveform, wherein the signal inversion module outputs the first and second waveforms in a first region spanning a first range of angular position of the magnet and outputs the first and second inverted waveforms in a second region spanning a second range of angular position of the magnet, wherein output in the first region is defined by
- output
- =
- A
-
-
- sin
-
- (
- θ
- )
- +
- offset
- 1
- k
-
- (
- A
-
-
- sin
-
- (
- θ
- )
- +
- A
-
-
- cos
-
- (
- θ
- )
- +
- 2
-
- offset
- )
- where θ indicates an angle of the magnet in relation to the first and second magnetic sensors, offset is a vertical offset of the first and second waveforms with respect to ground, A is an amplitude of the first and second waveforms, and k is a real number affecting gain and vertical offset of the output.
40 more elements
Dependencies are inferred from the claim text.