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US 7,352,177 B2Granted
Three-axis fluxgate-type magnetism detecting device and method
AssigneeSamsung Electronics Co., Ltd.
InventorsWoo-jong Lee, Sang-on Choi
Life of this patent
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Abstract
A three-axis fluxgate-type circuit having three fluxgate sensors for outputting three analog voltage values respectively. A controller normalizes three digital voltage values corresponding to said three analog voltage values, select a set of linear voltage values from the three normalized digital voltage values and calculate an azimuth based on the set of linear voltage values.
Claims5
A three-axis fluxgate-type magnetism detection device, comprising:
- a three-axis fluxgate-type circuit having three fluxgate sensors for outputting three analog voltage values respectively;
- a controller operable to normalize three digital voltage values corresponding to said three analog voltage values, select a set of linear voltage values from the three normalized digital voltage values and calculate an azimuth based on the set of linear voltage values;
- and
- a memory operable to store a normalized reference magnitude value,
- wherein the controller calculates the azimuth based on a ratio of the reference magnitude value to the set of linear voltage values, and
- wherein the reference magnitude value is set at an initial stage through rotations of the three-axis fluxgate-type magnetism detection device when a geomagnetic field varies.
3 more elements
A three-axis fluxgate-type magnetism detection device, comprising:
- a three-axis fluxgate-type circuit having three fluxgate sensors for outputting three analog voltage values respectively;
- a controller operable to select a set of linear voltage values from the three digital voltage values corresponding to the three analog values and calculate an azimuth based on the set of linear voltage values;
- and
- a memory operable to store a reference magnitude value,
- wherein the controller calculates the azimuth based on a ratio of the reference magnitude value to the set of linear voltage values, and
- wherein the reference magnitude value is set at an initial stage through rotations of the three-axis fluxgate-type magnetism detection device when a geomagnetic field varies.
3 more elements
A three-axis fluxgate-type magnetism detection device, comprising:
- a three-axis fluxgate-type circuit having three fluxgate sensors for outputting three analog voltage values respectively;
- and
- a controller operable to select a set of linear voltage values from the three digital voltage values corresponding to the three analog values and calculate an azimuth based on the set of linear voltage values,
- wherein the three fluxgate sensors are a first fluxgate sensor in an X axis, a second fluxgate sensor in an axis counterclockwise rotated 120° from the X axis, and a third fluxgate sensor in an axis counterclockwise rotated 240° from the X axis,
- wherein if a magnitude of a normalized first digital voltage value corresponding to the first fluxgate sensor is greater than a second digital voltage value corresponding to the second fluxgate sensor, and the magnitude of the second digital voltage value is greater than a third digital voltage value corresponding to the third fluxgate sensor, the azimuth is calculated by use of an equation as below:
- orientation
-
-
- angle
- =
- 60
-
- °
- ×
- second
-
-
- voltage
-
-
- value
- first
-
-
-
- reference
-
-
- voltage
-
-
- value
- wherein the first reference voltage value refers to a reference voltage value applied in case that the first, second and third digital values are in an interval of 0° to 60° and
- wherein the second voltage value is a linear voltage value corresponding to the second fluxgate sensor.
31 more elements
Dependencies are inferred from the claim text.