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Magnetic switch system capable of processing vertical Hall disc signal, and signal processing method

A magnetic switch and signal technology, applied in electronic switches, measuring magnetic variables, measuring devices, etc., can solve the problems of large drift voltage, inability to use alone, low sensitivity, etc.

Active Publication Date: 2017-12-05
SHANGHAI MAIGEEN MICROELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the vertical Hall plate still has the defects of low sensitivity and large drift voltage, and cannot be used alone. It needs proper signal processing before it can be put into practical application.

Method used

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  • Magnetic switch system capable of processing vertical Hall disc signal, and signal processing method
  • Magnetic switch system capable of processing vertical Hall disc signal, and signal processing method
  • Magnetic switch system capable of processing vertical Hall disc signal, and signal processing method

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Experimental program
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Embodiment 1

[0081] see image 3 , the present invention discloses a magnetic switch system capable of processing vertical Hall plate signals, said magnetic switch system comprising: vertical Hall plate VHP, rotary current switch, amplifier, filter, comparator, output logic, threshold selection circuit , auxiliary circuit; the vertical Hall plate, rotary current switch, amplifier, and filter are connected in sequence, the filter and the threshold value selection circuit are respectively connected to the input end of the comparator, the comparator is connected to the output logic, and the output signal of the output logic is fed back to the threshold A selection circuit; the auxiliary circuit is respectively connected to the vertical Hall plate, the rotary current switch, the amplifier, the filter, the comparator, and the output logic. image 3 The reference plane xOy and the applied magnetic field B are also drawn in .

[0082] The connection relationship of each module of the system in t...

Embodiment 2

[0102] The difference between this embodiment and Embodiment 1 is that in this embodiment, V can be selected REF1 =V REF2 , where the hysteresis window is zero and the comparator has a single threshold. Although this kind of comparator has poor anti-noise and jitter ability, its structure is relatively simple, and it can be applied to applications that require relatively low precision, such as quadrant determination of an auxiliary magnetoresistive angle sensor.

[0103] The structure of the comparator in this embodiment is an open-loop comparator, which has the characteristics of fast comparison speed, high comparison resolution, and insensitivity to parasitic capacitance. Of course, closed-loop comparators, regenerative comparators or hybrid comparators can also be chosen.

[0104] To sum up, the magnetic switch system and signal processing method capable of processing the vertical Hall plate signal proposed by the present invention can convert the horizontal magnetic fiel...

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PUM

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Abstract

The invention reveals a magnetic switch system capable of processing a vertical Hall disc signal, and a signal processing method. The system comprises a vertical Hall disc, a rotating current switch, an amplifier, a filter, a comparator, an output logic unit, a threshold value selection circuit, and an auxiliary circuit. The vertical Hall disc, the rotating current switch, the amplifier and the filter are connected sequentially, and the filter and the threshold value selection circuit are respectively connected with the input end of the comparator. The comparator is connected with the output logic unit, and an output signal of the output logic unit is fed back to the threshold value selection circuit. The auxiliary circuit is connected with the vertical Hall disc, the rotating current switch, the amplifier, the filter, the comparator and the output logic unit. According to the invention, the system and method can reduce the voltage drift of the vertical Hall disc and an internal signal processing system, can achieve the proper amplification of a weak magnetic field signal, obtain an electric signal which can precisely reflect the horizontal magnetic field intensity, and achieves the precise on-off control.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and relates to a magnetically controlled switch circuit integrated on a semiconductor chip, in particular to a magnetic switch system capable of processing signals from a vertical Hall disc; Disc signal processing method. Background technique [0002] Hall effect devices are widely used in various sensors to convert magnetic field signals into electrical signals. figure 1 A schematic diagram of the Hall effect is drawn. The current I passing through the Hall plate made of conductive or semiconducting material 0 , while applying a vertical magnetic field B. Under the joint action of Lorentz force and electric field force, a stable potential distribution is established in the Hall disk, and a potential difference V1 is generated at both ends of the plane perpendicular to the current direction. The magnitude of this potential difference is proportional to the strength of the magnetic...

Claims

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Application Information

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IPC IPC(8): G01R33/07H03K17/90
CPCG01R33/077H03K17/90
Inventor 陈志卿
Owner SHANGHAI MAIGEEN MICROELECTRONICS CO LTD