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Magnetic field sensor with sensitivity correction and offset correction functions and implementation method thereof

A magnetic field sensor and offset correction technology, applied in the direction of the size/direction of the magnetic field, instruments, measuring devices, etc., can solve the problems that the Hall sensor cannot respond well to the rapidly changing magnetic field, modify the compensation characteristics, and are not applicable, etc. Achieving fast response time, compensation for sensitivity drift, and good compensation effect

Inactive Publication Date: 2020-08-28
赛卓电子科技(上海)股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, analog compensation techniques are fixed and not suitable for modifying compensation characteristics during production or use
Magnetic field sensors using a digital path tend to be slower than those using an analog path
In other words, Hall sensors with a digital path do not respond well to rapidly changing magnetic fields (such as rapidly changing currents)

Method used

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  • Magnetic field sensor with sensitivity correction and offset correction functions and implementation method thereof
  • Magnetic field sensor with sensitivity correction and offset correction functions and implementation method thereof
  • Magnetic field sensor with sensitivity correction and offset correction functions and implementation method thereof

Examples

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Effect test

Embodiment 1

[0100] A magnetic field sensor with sensitivity correction, comprising: an analog signal path module 1, a correction module 2, a temperature detection module 3, an EEPROM storage module 4 and a segment processor module 5, wherein:

[0101] The analog signal path module 1 is used to detect the external magnetic field and output a voltage signal of corresponding magnitude; this module responds to the external magnetic field, and receives the gain control signal output by the correction module 2, and finally generates a voltage signal proportional to the magnitude of the magnetic field as the entire magnetic field the output of the sensor;

[0102] The correction module 2 is used for sensitivity correction; this module receives the gain correction signal output by the segment processor module 5, and generates a gain control signal in response to the received signal, thereby controlling the sensitivity value (gain) of the analog signal path module 1.

[0103] The temperature detec...

Embodiment 2

[0107] A magnetic field sensor with an offset correction function, comprising: an analog signal path module 1, a correction module 2, a temperature detection module 3, an EEPROM storage module 4 and a segment processor module 5, wherein:

[0108] The analog signal path module 1 is used to detect the external magnetic field and output a voltage signal of corresponding magnitude; this module responds to the external magnetic field, and receives the offset control signal output by the correction module 2, and finally generates a voltage signal proportional to the magnitude of the magnetic field as the whole The output of the magnetic field sensor;

[0109] The correction module 2 is used for offset correction; this module receives the offset correction signal output by the subsection processor module 5, and generates an offset control signal in response to the received signal, thereby controlling the offset value ( quiescent output voltage).

[0110] The temperature detection mo...

Embodiment 3

[0114] A magnetic field sensor with sensitivity correction and offset correction functions, comprising: an analog signal path module 1, a correction module 2, a temperature detection module 3, an EEPROM storage module 4 and a segment processor module 5, wherein:

[0115] The analog signal path module 1 is used to detect the external magnetic field and output a corresponding voltage signal; this module responds to the external magnetic field, and receives the gain control signal and offset control signal output by the correction module 2, and finally generates a voltage proportional to the magnitude of the magnetic field signal, as the output of the entire magnetic field sensor;

[0116] The correction module 2 is used for sensitivity correction and offset correction; this module receives the gain correction signal and the offset correction signal output by the subsection processor module 5, and generates a gain control signal and an offset control signal in response to the rece...

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Abstract

The invention discloses a magnetic field sensor with sensitivity correction and offset correction functions. The magnetic field sensor comprises an analog signal path module, a correction module, a temperature detection module, an EEPROM storage module and a segmentation processor module. Gain correction coefficients and offset correction coefficients digitally stored in the magnetic field sensormay be used to generate analog control signals to control sensitivity and offset of an analog signal path of the magnetic field sensor. The gain correction coefficient and the offset correction coefficients stored in the magnetic field sensor in a digital form can be used for generating an analog control signal to control the sensitivity and the offset of an analog signal path of the magnetic field sensor. The temperature compensation circuit has quick response time of an analog access, ensures sensitivity and static output voltage precision at room temperature, can change temperature compensation characteristics in the production and use process, and can compensate sensitivity drift and static output voltage drift caused by mechanical stress and device aging at the same time.

Description

Technical field: [0001] The invention relates to the technical field of magnetic field sensors, in particular to a magnetic field sensor with sensitivity correction and offset correction functions and an implementation method, which is suitable for a magnetic field sensor IC. Background technique: [0002] Magnetic field sensors are widely used in consumer electronics (such as washing machines, air conditioners, refrigerators, floor fans, etc.) and automotive fields (such as gearboxes, automatic locks, seat belt buckles, brake light switches, automatic windows, etc.). Magnetic field sensors are an integral part of safety systems, EPS systems and body electronics. Modern vehicles have more than 80 applications that rely on magnetic sensors, and more than 2 billion magnetic field sensors are used in the automotive field every year. In addition, the market capacity of magnetic field sensors maintains an annual growth rate of 5% to 10%, and the development prospects are very go...

Claims

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Application Information

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IPC IPC(8): G01R33/02G01R35/00
CPCG01R33/02G01R35/005
Inventor 胡枭汪坚雄张超
Owner 赛卓电子科技(上海)股份有限公司
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