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Temperature compensation circuit and compensation method of amr magnetic switch circuit

A temperature compensation circuit, temperature compensation technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve problems such as the influence of sensor characteristics

Active Publication Date: 2017-10-27
SHANGHAI MAIGEEN MICROELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the temperature drift of the AMR element is not compensated, it can have a significant impact on the characteristics of the sensor

Method used

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  • Temperature compensation circuit and compensation method of amr magnetic switch circuit
  • Temperature compensation circuit and compensation method of amr magnetic switch circuit
  • Temperature compensation circuit and compensation method of amr magnetic switch circuit

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Embodiment 1

[0054] see image 3 , Figure 4 , The present invention discloses a temperature compensation circuit of an AMR magnetic switch circuit, the temperature compensation circuit includes: a first voltage generating module and a second voltage generating module.

[0055] The first voltage generation module is used to generate a first voltage Vbg that determines the bias voltage of the AMR; the first voltage Vbg is a reference voltage generated by a bandgap reference circuit, which does not vary with changes in power supply voltage or temperature.

[0056] The second voltage generation module is used to generate a second voltage that determines the threshold voltage of the comparator; the second voltage Vpt is a reference voltage with a negative temperature coefficient, that is, when the temperature rises, the second voltage Vpt will drop. When the temperature coefficient of the second voltage Vpt is equal to that of the AMR, since the output of the AMR and the threshold of the comp...

Embodiment 2

[0072] A temperature compensation circuit of an AMR magnetic switch circuit, the temperature compensation circuit includes: a first voltage generating module and a second voltage generating module.

[0073] The first voltage generation module is used to generate the first voltage Vbg that determines the AMR bias voltage; the first voltage Vbg is a reference voltage generated by the bandgap reference circuit; the first voltage Vbg generated by the first voltage generation module does not follow the power supply Varies with changes in voltage or temperature.

[0074] The second voltage generation module is used to generate a second voltage that determines the threshold voltage of the comparator; the second voltage Vpt is a reference voltage with a negative temperature coefficient, that is, when the temperature rises, the second voltage Vpt will drop. When the temperature coefficient of the second voltage Vpt is equal to that of the AMR, since the output of the AMR and the thresh...

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Abstract

The invention discloses a temperature compensating circuit and method for an AMR magnetic switch circuit.The temperature compensating circuit comprises a first voltage generation module and a second voltage generation module; the first voltage generation module is used for generating a first voltage for determination of an AMR bias voltage; the first voltage is a reference voltage generated by a band-gap reference circuit; the second voltage generation module is used for generating a second voltage for determination of a comparator threshold voltage; the second voltage is a reference voltage with a negative temperature coefficient, that is, when the temperature rises, the second voltage drops.According to the temperature compensating circuit and method for the AMR magnetic switch circuit, by compensating for the temperature drift of an AMR element, the temperature characteristic of a magnetic switch tipping point is improved, and magnetic parameters of the magnetic switch tipping point are made to keep good uniformity within a broad temperature range.The temperature compensating circuit is realized by adding a simple bypass to the traditional band-gap reference circuit to generate a reference current with a negative temperature coefficient; the realization method is simple, and the area and power of the added circuit are small.

Description

technical field [0001] The invention belongs to the technical field of AMR magnetic switches, and relates to an AMR magnetic switch circuit, in particular to a temperature compensation circuit of the AMR magnetic switch circuit; meanwhile, the invention also relates to a temperature compensation method of the AMR magnetic switch circuit. Background technique [0002] Anisotropic Magneto-Resistive (AMR for short) is an important magnetic sensor element for detecting magnetic fields. It is widely used in automobiles, industrial control, home appliances, and communication equipment to detect information such as speed, angle, and position. Compared with traditional Hall effect elements, AMR has excellent characteristics such as low power consumption and high sensitivity. But the temperature drift of AMR itself is relatively large. Its sensitivity will decrease with the increase of temperature, and the typical temperature coefficient can reach -3000ppm / K to -4000ppm / K. If the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/567
CPCG05F1/567
Inventor 朱剑宇
Owner SHANGHAI MAIGEEN MICROELECTRONICS CO LTD