Hall sensitivity closed-loop compensation structure

Abstract

The utility model relates to the technical field of Hall sensors, in particular to a Hall sensitivity closed-loop compensation structure, which comprises a metal coil arranged above a Hall element and formed by coiling a metal layer. The power supply is connected with the metal coil; the output end of the Hall element is connected with the input end of the amplifier through a line, the output end of the amplifier is connected with the input end of the analog-to-digital converter through a line, the output end of the analog-to-digital converter is connected with one input end of the comparator through a line, and the output end of the comparator is connected with the input end of the digital-to-analog converter through a line. One output end of the digital-to-analog converter is connected with the Hall element through a line to form a closed loop, and the other output end of the digital-to-analog converter is connected with the other input end of the comparator through a line. Compared with the prior art, the Hall sensor system has the advantages that the closed-loop compensation technology is adopted, output signals of the sensor are continuously monitored and dynamically adjusted, errors are effectively eliminated, and the overall performance of the Hall sensor system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of Hall sensors, in particular to a Hall sensitivity closed-loop compensation structure. Background Art

[0002] Hall sensors are sensors that use the Hall effect to measure magnetic field strength. Traditionally, they rely on an external magnetic field to deflect charge carriers in a semiconductor material, generating a voltage difference perpendicular to the current and magnetic field. However, this approach is susceptible to external environmental factors such as temperature changes and mechanical vibration, which limits the sensor's performance and stability.

[0003] In applications where high-precision magnetic field measurement is crucial, such as precision industrial manufacturing, navigation systems for autonomous vehicles, and navigation and control systems for aerospace, the adoption of this technology has become key to improving overall system performance. By ensuring more accurate and stable sensor measurements, these applications can achieve greater operational efficiency and safety, driving technological advancement and innovation in related industries.

[0004] Therefore, how to optimize the performance of the sensor through precise adjustment, make it less sensitive to interference from the external environment, and enhance the reliability and durability of the sensor has become an urgent problem to be solved. Utility Model Content

[0005] The purpose of this utility model is to overcome the deficiencies of the prior art and provide a Hall sensitivity closed-loop compensation structure to improve the sensitivity and stability of the Hall sensor, reduce the impact of external environmental factors on the sensor performance, and thus improve the measurement accuracy and stability of the sensor system.

[0006] In order to achieve the above-mentioned purpose, a closed-loop compensation structure for Hall sensitivity is designed, comprising: a metal coil formed by winding a metal layer and arranged above a Hall element; a power supply connected to the metal coil; the output end of the Hall element is connected to the input end of an amplifier via a circuit, the output end of the amplifier is connected to the input end of an analog-to-digital converter via a circuit, the output end of the analog-to-digital converter is connected to one input end of a comparator via a circuit, the output end of the comparator is connected to the input end of a digital-to-analog converter via a circuit, one output end of the digital-to-analog converter is connected to the Hall element via a circuit to form a closed loop, and the other output end of the digital-to-analog converter is connected to the other input end of the comparator via a circuit.

[0007] Preferably, the Hall sensitivity closed-loop compensation structure provided by the present invention also has other technical features, wherein the power supply is a metal coil that is used to generate a reference magnetic field Bref that does not change with temperature when the external magnetic field is 0.

[0008] Preferably, the Hall sensitivity closed-loop compensation structure provided by the present invention also has other technical features, wherein the digital-to-analog converter outputs a reference voltage Vref under a reference magnetic field Bref.

[0009] Preferably, the Hall sensitivity closed-loop compensation structure provided by the present invention also has other technical features, among which, it also includes a controller for controlling the power supply current of the Hall element.

[0010] Compared with the prior art, the utility model has the following advantages:

[0011] The closed-loop compensation technology employed in this patent effectively eliminates errors caused by variables such as temperature fluctuations and device aging by continuously monitoring the sensor's output signal and making dynamic adjustments. This technology significantly improves the overall performance of the Hall effect sensor system. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 , is the circuit diagram of the utility model;

[0013] Figure 2 , is the work flow chart of the utility model;

[0014] In the figure: 1 metal coil, 2 Hall element. DETAILED DESCRIPTION

[0015] In order to make the purpose, principle and structure of the present invention more clear, it is further described below with reference to the accompanying drawings and specific embodiments.

[0016] See also Figure 1 、 2 The utility model provides a Hall sensitivity closed-loop compensation structure, comprising:

[0017] Metal coil 1, composed of a metal layer, is located above Hall element 2 and wound in a spiral shape to generate a magnetic field. A power supply connected to the metal coil supplies power to the coil, ensuring that a constant reference magnetic field, Bref, is generated in the absence of external magnetic fields and is independent of ambient temperature. The output of the Hall element is connected via a wire to the input of an amplifier, which amplifies the signal detected by the Hall element. The output of the amplifier is further connected via a wire to the input of an analog-to-digital converter (ADC), which converts the analog signal into a digital signal. The output of the ADC is connected via a wire to one input of a comparator, which compares the digital signal with a preset value. The output of the comparator is connected via a wire to the input of a digital-to-analog converter (DAC), which converts the digital signal back into an analog signal. One output of the DAC is connected via a wire back to the Hall element, forming a closed-loop system to adjust the performance of the Hall element. The other output of the DAC is connected via a wire to the other input of the comparator, completing the feedback loop.

[0018] The power supply ensures that the metal coil generates a stable reference magnetic field, Bref, in the absence of an external magnetic field. The digital-to-analog converter outputs a constant reference voltage, Vref, based on the reference magnetic field, Bref. The system also includes a controller for precisely controlling the current supplied to the Hall element to optimize its performance.

[0019] The specific workflow is as follows:

[0020] Sensitivity calibration: Set the system's external magnetic field B to zero. Turn on a temperature-independent constant current source, Iref, to power a planar metal coil 1 formed by a metal layer wound above the Hall element. This provides a temperature-invariant reference magnetic field, Bref. Hall element 2, influenced by reference magnetic field Bref, generates a weak Hall signal. This signal is amplified and converted via analog-to-digital converters (ADD-DA) to generate a reference voltage, Vref. The system records the Vref value and provides a reference for subsequent closed-loop adjustments.

[0021] Closed-loop compensation: When working normally, the constant current source Iref is turned off, the reference magnetic field Bref disappears, and the signal generated when the Hall element is affected by the external magnetic field B is amplified to obtain the Hall voltage Vhall. The Hall voltage Vhall is compared with the reference voltage Vref. If Vhall is lower than Vref, the value of the Hall element supply current Ibias is increased until Vhall exceeds Vref, entering a dynamic equilibrium state, thereby achieving sensitivity closed-loop compensation.

[0022] This closed-loop compensation structure is designed to improve the sensitivity and stability of the Hall element under varying temperature and magnetic field conditions, ensuring measurement accuracy. Through precise control and feedback adjustment, the system can automatically adapt to environmental changes and maintain the accuracy of the Hall element output signal.

[0023] The above description is only a specific implementation method of this utility model, but the protection scope of this utility model is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by this utility model, can make equivalent substitutions or changes based on the technical solutions and new concepts of this utility model, which should be covered by the protection scope of this utility model.

Claims

1. A Hall sensitivity closed-loop compensation structure, characterized in that include A metal coil formed by winding a metal layer and arranged above the Hall element; A power source connected to the metal coil; The output end of the Hall element is connected to the input end of the amplifier through a line, the output end of the amplifier is connected to the input end of the analog-to-digital converter through a line, the output end of the analog-to-digital converter is connected to one end of the comparator input through a line, the output end of the comparator is connected to the input end of the digital-to-analog converter through a line, one end of the output of the digital-to-analog converter is connected to the Hall element through a line to form a closed loop, and the other end of the digital-to-analog converter output is connected to the other end of the comparator input through a line.

2. The Hall sensitivity closed-loop compensation structure according to claim 1, characterized in that The power supply supplies power to the metal coil and is used to generate a reference magnetic field Bref that does not change with temperature when the external magnetic field is zero.

3. A Hall sensitivity closed-loop compensation structure as claimed in claim 2, characterized in that The digital-to-analog converter outputs a reference voltage Vref in the case of a reference magnetic field Bref.

4. A Hall sensitivity closed-loop compensation structure as claimed in claim 1, characterized in that The invention also includes a controller for controlling the power supply current of the Hall element.

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