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Detection Circuit, Semiconductor Integrated Circuit Device, Magnetic Field Rotation Angle Detection Device, And Electronic Device

一种检测电路、旋转角的技术，应用在测量装置、测量磁变量、磁场的大小/方向等方向

Active Publication Date: 2014-09-24
水晶飞跃有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, if a magnetic sensor is used to detect the rotation angle of the magnetic field by using a magnetic sensor in which two sensor units composed of bridge-connected multiple MR elements are staggered by 45° from each other, the rotation angle of the magnetic field can only be detected at 45° (1 / 8 turn) accuracy to detect the rotation angle

Method used

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  • Detection Circuit, Semiconductor Integrated Circuit Device, Magnetic Field Rotation Angle Detection Device, And Electronic Device
  • Detection Circuit, Semiconductor Integrated Circuit Device, Magnetic Field Rotation Angle Detection Device, And Electronic Device
  • Detection Circuit, Semiconductor Integrated Circuit Device, Magnetic Field Rotation Angle Detection Device, And Electronic Device

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Embodiment Construction

[0032] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0033] figure 1 It is a partial side view showing the structure of an electronic device according to some embodiments of the present invention. This electronic device is an electronic device such as a water meter, a gas meter, or a speedometer, and includes a rotating body 10 having a magnet 10 a and a magnetic sensor 20 having a first sensor unit 21 and a second sensor unit 22 .

[0034] For example, the rotor 10 is connected to an impeller or the like that rotates with the movement of fluid such as tap water or gas. Alternatively, the rotating body 10 may be a rotating shaft of a motor or a wheel. When the rotating body 10 rotates, the magnet 10a will generate a rotating magnetic field. The magnetic sensor 20 is arranged at a position where the magnetic flux formed from the N pole to the S pole of the magnet 10 a passes.

[0035] Each of the first sensor ...

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Abstract

Detection of the rotation angle of a magnetic field using a magnetic sensor in which two sensor units are arranged at a predetermined angle with respect to each other is performed with a resolution of an angle smaller than 45 DEG with a simple circuit configuration. A detection circuit is connectable to a magnetic sensor in which first and second sensor units are arranged, at a predetermined angle with respect to each other, each sensor unit having a bridge circuit of magnetoresistance elements. The detection circuit includes a first comparison circuit that compares output signals of the first or second sensor unit, a second comparison circuit that compares an output signal of the first sensor unit with an output signal of second sensor unit, and a rotation angle calculation circuit that calculates a rotation angle of a magnetic field based on the comparison results of the first and second comparison circuits.

Description

technical field [0001] The present invention relates to a detection circuit and a semiconductor integrated circuit device that are connected to a magnetic sensor using a magnetoresistance effect element (hereinafter, also referred to as "MR element") to detect a rotation angle of a magnetic field. In addition, the present invention relates to a magnetic field rotation angle detection device including such a magnetic sensor and a detection circuit. Furthermore, the present invention relates to electronic equipment such as a water meter, a gas meter, and a speedometer using a magnetic field rotation angle detection device. Background technique [0002] The MR element has a characteristic that its resistance value changes according to the strength of the magnetic field due to the magnetoresistance effect, and its resistance value increases when a magnetic field is applied to the MR element. Therefore, by bridge-connecting a plurality of MR elements, the rotation angle of a rot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/09
CPCG01D5/00G01R33/09G01R33/0023G01D5/145G01R33/02G01R33/093
Inventor 桑野俊一
Owner 水晶飞跃有限责任公司