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Stress compensation circuit and magnetic field sensing system

A technology of stress compensation and magnetic field sensing, which is applied in the direction of magnetic field offset compensation, measuring devices, and measuring magnetic variables, can solve the problems of narrow adjustment range of stress compensation circuit, complicated adjustment process, and inability to quantify and calculate the output compensation voltage value. Achieve the effects of increasing the adjustment range, simplifying the adjustment process, and compensating for the increase in the adjustment range

Pending Publication Date: 2022-03-01
SUZHOU NOVOSENSE MICROELECTRONICS
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Problems solved by technology

[0004] One of the objectives of the present invention is to provide a stress compensation circuit to solve the technical problems in the prior art that the adjustment range of the stress compensation circuit is narrow, the adjustment process is complicated, and the output compensation voltage value cannot be quantified and calculated.

Method used

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  • Stress compensation circuit and magnetic field sensing system
  • Stress compensation circuit and magnetic field sensing system
  • Stress compensation circuit and magnetic field sensing system

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Embodiment Construction

[0034] The present invention will be described in detail below in conjunction with specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, method, or functional changes made by those skilled in the art according to these embodiments are included in the protection scope of the present invention.

[0035] It should be noted that the term "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also items not expressly listed other elements, or also include elements inherent in such a process, method, article, or apparatus. In addition, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh", etc. are used for descriptive purposes only and should not be construed as indicating or imply relative importance.

[0036] Such as fi...

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Abstract

The invention discloses a stress compensation circuit and a magnetic field sensing system, and the stress compensation circuit is used for compensating the mechanical stress of a magnetic field sensing element, and comprises a current generator, a first reference resistor, a second reference resistor, a third reference resistor, and a circuit output end. The first mirror image branch, the second mirror image branch and the third mirror image branch are connected in parallel; the current generator is connected with the first mirror image branch, the first mirror image branch and the second mirror image branch are grounded through the first reference resistor and the second reference resistor respectively, and the third mirror image branch is connected with the output end of the circuit; and the third reference resistor is connected in parallel between the second mirror image branch and the third mirror image branch, and the third reference resistor is configured to have the same piezoresistive coefficient as the first reference resistor. According to the stress compensation circuit provided by the invention, the adjustment process is simplified, the output compensation voltage value can be quantitatively calculated, and the corresponding compensation adjustment range is further enlarged.

Description

technical field [0001] The invention relates to the technical field of magnetic field sensing, in particular to a stress compensation circuit and a magnetic field sensing system. Background technique [0002] Magnetic field sensing elements are widely used in daily life, industrial fields, and energy fields. By sensing the current magnetic field state, functions such as orientation judgment, contact opening and closing, and data measurement are realized. Hall semiconductor devices, which are mostly used for magnetic field sensing, may be affected by environmental physical parameters during operation, resulting in output errors outside the allowable range. The physical parameters typically include mechanical stress. [0003] In the prior art, in order to compensate the influence of mechanical stress, a stress compensation circuit is set in the magnetic field sensing system, and the change of the resistance value of the reference resistance after being stressed is mirrored to ...

Claims

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Application Information

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IPC IPC(8): G01R33/00
CPCG01R33/0017
Inventor 秦文辉袁辅德
Owner SUZHOU NOVOSENSE MICROELECTRONICS
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