A hall effect gas pressure sensor
By optimizing the configuration circuit of the Hall effect barometer, the problem of insufficient signal processing was solved, and the signal was accurately amplified, anti-interference and ease of use were improved, adapting to the detection needs of different pressure ranges and meeting the accuracy and ease of use requirements of multiple scenarios.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JUXIN MICRO INTELLIGENT TECHNOLOGY (DONGGUAN) CO LTD
- Filing Date
- 2025-09-17
- Publication Date
- 2026-06-26
AI Technical Summary
The existing Hall effect barometric pressure sensor has insufficient signal processing circuitry, which makes weak electrical signals easily masked by noise. The bias circuit lacks flexible adjustment means and cannot adapt to different pressure ranges. Furthermore, it lacks an intuitive output indication mechanism, which limits its application in scenarios with high requirements for accuracy and ease of use.
The circuit configuration employs a Hall effect sensor module, a preamplifier module, a secondary operation module, and an output driver module. A voltage divider circuit provides a stable bias voltage and operating power supply, forming a two-stage in-phase proportional amplifier circuit. Combined with a low-pass filter circuit, indicator lights, and a pointer voltmeter, it achieves accurate signal amplification, anti-interference, and intuitive display.
It improves the detection accuracy, anti-interference performance and ease of use of barometric pressure sensors, and can meet the needs of accurate barometric pressure detection in various scenarios such as meteorology and industry, providing intuitive working status indication and real-time display.
Smart Images
Figure CN224416312U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of circuits, specifically to a Hall effect barometric pressure sensor. Background Technology
[0002] Barometric pressure sensors are widely used in meteorological monitoring, industrial process control, aerospace, and many other fields. Traditional barometric pressure sensors (such as piezoresistive and capacitive sensors) have significant drawbacks: piezoresistive sensors are susceptible to temperature drift, resulting in poor long-term stability; capacitive sensors have complex structures, are difficult to manufacture, and are significantly affected by external electromagnetic interference. Furthermore, their signal conditioning circuits are often simply designed, making it difficult to accurately amplify and filter weak signals. Hall effect barometric pressure sensors, based on the principle of magnetoelectric conversion, have potential advantages such as strong resistance to electromagnetic interference and good temperature stability. However, existing Hall effect barometric pressure sensor signal processing circuits still have shortcomings: most only use single-stage amplification, and the weak electrical signal output by the Hall element is still insufficient in amplitude after amplification, easily masked by noise; the bias circuit lacks flexible adjustment methods, making it unable to adapt to the detection needs of different pressure ranges; and there is a lack of intuitive output indication mechanisms, making it inconvenient for rapid on-site observation and calibration, limiting its widespread application in scenarios with high requirements for accuracy and ease of use. Utility Model Content
[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a Hall effect pressure sensor to solve the problems mentioned in the background art.
[0004] This utility model provides a Hall effect barometric pressure sensor, which adopts the following technical solution:
[0005] A Hall effect barometric pressure sensor includes a housing, a Hall effect barometric pressure sensing element installed inside the housing, and its configuration circuit. The configuration circuit includes a Hall effect sensing module, a preamplifier module, a secondary operation module, and an output drive module. The Hall effect sensing module includes a Hall effect barometric pressure sensing element, resistor R1, variable resistor RP, resistor R2, resistor R3, resistor R4, and resistor R5. The Hall effect barometric pressure sensing element converts external barometric pressure signals into weak electrical signals. Resistors R1, RP, and R2 form a voltage divider circuit to provide a stable bias voltage for the Hall element. Resistor R4 provides the operating power to the Hall element, and resistor R5 provides a grounding loop for the Hall element. The preamplifier module includes an operational amplifier N1, resistors R6, R7, and R8. Operational amplifier N1 amplifies the weak electrical signal output by the Hall element in the first stage. Resistor R7 is a negative feedback resistor, which, together with resistor R6, determines the first-stage amplification factor. Resistor R8... The signal transmission resistor is used. The secondary operation module includes an operational amplifier N2, resistors R9, R10, and R11, and a capacitor C1. The operational amplifier N2 amplifies the pre-amplified signal again. Resistors R9 and R10 form a voltage divider circuit. Resistor R11 is a negative feedback resistor, which, together with resistor R8, determines the second-stage amplification factor. Capacitor C1 and resistor R10 form a low-pass filter circuit. The output drive module includes a signal output interface VOUT, a resistor R12, an indicator light VL, and a pointer voltmeter PV. The signal output interface VOUT is the external output terminal, resistor R12 is the current-limiting resistor for the indicator light VL, and the pointer voltmeter PV is used to display the output voltage value in real time.
[0006] Furthermore, the first pin of the Hall effect pressure sensing element is electrically connected to a resistor R4 and then electrically connected to the power supply VIN terminal, and the third pin of the Hall effect pressure sensing element is electrically connected to a resistor R5 and then grounded.
[0007] Furthermore, the second pin of the Hall effect pressure sensing element is electrically connected to one end of a resistor R6, the other end of resistor R6 is electrically connected to resistor R3, the power supply VIN terminal is electrically connected to resistor R1, resistor R1 is electrically connected to one end of a variable resistor RP, the other end of the variable resistor RP is electrically connected to resistor R2 and then grounded, and resistor R3 is electrically connected to the variable terminal of the variable resistor RP.
[0008] Furthermore, the fourth pin of the Hall effect pressure sensing element is electrically connected to the non-inverting input of the operational amplifier N1, and the inverting input of the operational amplifier N1 is electrically connected to the other end of the resistor R6 and then electrically connected to the second pin of the Hall effect pressure sensing element.
[0009] Furthermore, the output terminal of operational amplifier N1 is electrically connected to one end of resistor R7, and the other end of resistor R7 is electrically connected to the inverting input terminal of operational amplifier N1.
[0010] Furthermore, the output terminal of operational amplifier N1 is electrically connected to resistor R8, and resistor R8 is electrically connected to the inverting input terminal of operational amplifier N2.
[0011] Furthermore, the inverting input terminal of operational amplifier N2 is also electrically connected to a resistor R11, which is electrically connected to the output terminal of operational amplifier N2.
[0012] Furthermore, the positive input terminal of operational amplifier N2 is electrically connected to capacitor C1, resistor R10, and resistor R9, respectively. Capacitor C1 and resistor R10 are grounded, and resistor R9 is electrically connected to the power supply VIN terminal.
[0013] Furthermore, the output terminal of operational amplifier N2 is equipped with a signal output interface VOUT.
[0014] Furthermore, the output terminal of operational amplifier N2 is electrically connected to resistor R12, and resistor R12 is electrically connected to indicator light VL.
[0015] Furthermore, the output of operational amplifier N2 is electrically connected to a pointer voltmeter PV.
[0016] The beneficial effects of this utility model are:
[0017] The Hall effect barometric pressure sensor of this application offers several significant advantages through optimized circuit configuration: In the Hall sensing module, the voltage divider circuit composed of resistor R1, variable resistor RP, and resistor R2 allows for flexible adjustment of the bias voltage, adapting to detection scenarios with different barometric pressure ranges. Resistor R4 provides a stable power supply for the Hall element, and resistor R5 provides a reliable grounding loop, jointly ensuring the stability and linearity of the conversion from barometric pressure signal to electrical signal. The preamplifier module and the secondary operation module constitute a two-stage in-phase proportional amplifier circuit. Through the cooperation of resistors R7 and R6, and resistors R11 and R8, the amplification factor can be flexibly adjusted to match signal requirements of different amplitudes. Simultaneously, the low-pass filter circuit composed of capacitor C1 and resistor R10 effectively suppresses high-frequency noise, ensuring that the weak electrical signal output by the Hall element is accurately amplified and has strong anti-interference capabilities. In the output drive module, the indicator light VL visually indicates the circuit's operating status, the pointer voltmeter PV displays the output voltage in real time to visually reflect barometric pressure changes, and the signal output interface VOUT facilitates external A / D conversion. Digital devices such as converters and microcontrollers have significantly improved the detection accuracy, anti-interference performance, and ease of use of sensors, better meeting the needs for accurate air pressure detection in various scenarios such as meteorology and industry. Attached Figure Description
[0018] Figure 1 This is a circuit diagram of a Hall effect pressure sensor according to the present invention. Detailed Implementation
[0019] This utility model provides a Hall effect barometric pressure sensor, including a housing, and a Hall effect barometric pressure sensing element and its configuration circuit installed inside the housing, such as... Figure 1 As shown, the configuration circuit includes a Hall effect sensor module, a preamplifier module, a secondary operation module, and an output drive module. The electronic components of the Hall effect sensor module include a Hall effect pressure sensor element, a resistor R1, a variable resistor RP, a resistor R2, a resistor R3, a resistor R4, and a resistor R5.
[0020] When using Hall effect pressure sensing elements in practical applications, the appropriate model can be selected based on technical parameters such as pressure measurement range, accuracy, and operating voltage. Examples include Honeywell's HSC series Hall pressure sensing elements and MEAS's MS5534 series Hall pressure sensing elements. The specific model needs to be determined based on the requirements of the actual application scenario.
[0021] The power supply VIN terminal is electrically connected to one end of resistor R1, the other end of resistor R1 is electrically connected to one end of variable resistor RP, the other end of variable resistor RP is electrically connected to one end of resistor R2, and the other end of resistor R2 is grounded; the variable terminal of variable resistor RP is electrically connected to one end of resistor R3, and the other end of resistor R3 is electrically connected to one end of resistor R6 (the second pin side of the Hall element); the first pin of the Hall effect pressure sensor is electrically connected to one end of resistor R4, and the other end of resistor R4 is electrically connected to the power supply VIN terminal; the second pin of the Hall effect pressure sensor is electrically connected to one end of resistor R6; the third pin of the Hall effect pressure sensor is electrically connected to one end of resistor R5, and the other end of resistor R5 is grounded; the fourth pin of the Hall effect pressure sensor is electrically connected to the non-inverting input terminal of operational amplifier N1.
[0022] The Hall effect barometric pressure sensor is the core sensitive element, its function being to convert external air pressure signals into weak electrical signals (voltage or current). Resistors R1, RP, and R2 form a voltage divider circuit, providing a stable bias voltage to the Hall element. By adjusting the value of RP, the output voltage at its variable terminal can be changed, thereby adjusting the operating point of the Hall element and ensuring its linearity across different pressure ranges. Resistor R4 provides the operating power to the Hall element (drawn from VIN), and resistor R5 provides a grounding loop for the Hall element. Both resistors work together to stabilize the operating current of the Hall element, ensuring the stability of its output signal.
[0023] The electronic components of the preamplifier module include operational amplifier N1, resistors R6, R7, and R8. The inverting input of operational amplifier N1 is electrically connected to the other end of resistor R6 (away from the second pin of the Hall element); the output of operational amplifier N1 is electrically connected to one end of resistor R7, and the other end of resistor R7 is electrically connected to the inverting input of operational amplifier N1; the output of operational amplifier N1 is also electrically connected to one end of resistor R8, and the other end of resistor R8 is electrically connected to the inverting input of operational amplifier N2; one end of capacitor C1 is electrically connected to the non-inverting input of operational amplifier N2, and the other end of capacitor C1 is grounded.
[0024] Operational amplifier N1 forms a non-inverting amplifier circuit. Its core function is to amplify the weak electrical signal output from the Hall element in the first stage. The signal output from the fourth pin of the Hall element is connected to the non-inverting input of operational amplifier N1, and the signal from the second pin of the Hall element is connected to the inverting input of N1 via resistor R6, forming a differential input to suppress common-mode interference. Resistor R7 is a negative feedback resistor, which, together with resistor R6, determines the first-stage amplification factor. The amplification factor A1 = 1 + R7 / R6. The amplification gain can be changed by adjusting the resistance values of R7 or R6. Resistor R8 is a signal transmission resistor, which transmits the signal amplified by N1 to the next stage, namely the secondary operational module.
[0025] The electronic components of the secondary operation module include operational amplifier N2, resistors R9, R10, R11, and capacitor C1.
[0026] The positive input terminal of operational amplifier N2 is electrically connected to one end of capacitor C1, one end of resistor R10, and one end of resistor R9, respectively; the other end of resistor R9 is electrically connected to the power supply VIN terminal, and the other ends of capacitor C1 and resistor R10 are grounded; the inverting input terminal of operational amplifier N2 is electrically connected to the other end of resistor R8 and one end of resistor R11, and the other end of resistor R11 is electrically connected to the output terminal of operational amplifier N2; the output terminal of operational amplifier N2 is the signal output interface VOUT.
[0027] Operational amplifier N2 forms the second-stage non-inverting amplifier circuit, which further amplifies the pre-amplified signal to increase the signal amplitude to meet output requirements. Resistors R9 and R10 form a voltage divider circuit to provide a stable DC bias voltage to the positive input terminal of operational amplifier N2, ensuring that operational amplifier N2 operates in the appropriate linear region. Resistor R11 is a negative feedback resistor, which, together with resistor R8, determines the amplification factor of the second stage. The amplification factor A2 = 1 + R11 / R8. The total amplification factor of the two-stage amplifier circuit is A = A1 * A2, which can amplify the weak signal from the Hall element to a sufficiently strong voltage signal, output through VOUT. Capacitor C1 and resistor R10 form a low-pass filter circuit to filter out high-frequency noise in the signal and prevent interference with subsequent operations.
[0028] The output driver module includes a signal output interface VOUT, a resistor R12, an indicator light VL, and a pointer voltmeter PV.
[0029] The output terminal of operational amplifier N2 (i.e., signal output interface VOUT) is electrically connected to one end of resistor R12, and the other end of resistor R12 is electrically connected to one end of indicator light VL. The other end of indicator light VL is grounded. The two ends of pointer voltmeter PV are electrically connected to the output terminal of operational amplifier N2 and ground (or the corresponding reference terminal), and are connected in parallel to the output signal.
[0030] The signal output interface VOUT is the external output terminal, which can be connected to subsequent devices (such as A / D converters, microcontrollers, etc.) to realize digital processing or closed-loop control of the air pressure signal. Resistor R12 is the current-limiting resistor for the indicator light VL, preventing excessive current from burning out the indicator light VL. When the operational amplifier N2 outputs voltage, current flows through resistor R12 through the indicator light VL, illuminating it and visually indicating that the circuit is in working condition (output signal is valid). The pointer voltmeter PV is used to display the output voltage value in real time, visually reflecting the change in external air pressure through voltage changes (voltage and air pressure have a linear relationship), facilitating manual observation and calibration.
[0031] The overall working principle of this application is as follows: When external air pressure acts on the Hall effect pressure sensing element, the element converts the air pressure signal into a weak electrical signal; the power supply VIN terminal provides a stable bias voltage to the Hall effect pressure sensing element through a voltage divider circuit composed of resistor R1, variable resistor RP, and resistor R2; resistor R4 provides its operating power supply; and resistor R5 provides its grounding loop, ensuring that the weak electrical signal output by the Hall effect pressure sensing element is transmitted to the non-inverting input terminal of operational amplifier N1; operational amplifier N1 introduces feedback through resistor R6, forming a non-inverting proportional amplifier circuit with resistor R7 to perform the first stage amplification of the weak electrical signal; the amplified signal is transmitted to the inverting input terminal of operational amplifier N2 through resistor R8; the non-inverting input terminal of operational amplifier N2 is provided with DC bias by a voltage divider circuit composed of resistors R9 and R10, and capacitor C1 and resistor R10 form a low-pass filter circuit to filter out high-frequency noise; operational amplifier N2 introduces feedback through resistor R11, forming a non-inverting proportional amplifier circuit with resistor R8... This forms the second-stage non-inverting amplifier circuit, which amplifies the signal again. Finally, the signal at the output of the operational amplifier N2 is transmitted to the outside via the signal output interface VOUT (which can be connected to devices such as A / D converters for digital processing). At the same time, after being current-limited by resistor R12, it drives the indicator light VL to light up to indicate the circuit's working status. The output voltage value is also displayed in real time by the pointer voltmeter PV, thereby realizing the conversion, amplification, and visualization of the air pressure signal to a voltage signal.
[0032] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
[0033] The above are all preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be included within the scope of protection of this utility model.
Claims
1. A Hall effect barometric pressure sensor, comprising a housing and a Hall effect barometric pressure sensing element and its configuration circuit mounted within the housing, characterized in that, The configuration circuit includes a Hall effect sensing module, a preamplifier module, a secondary operation module, and an output driver module. The Hall effect sensing module includes a Hall effect pressure sensor element, resistor R1, variable resistor RP, resistor R2, resistor R3, resistor R4, and resistor R5. The Hall effect pressure sensor element converts the external air pressure signal into a weak electrical signal. Resistors R1, RP, and R2 form a voltage divider circuit to provide a stable bias voltage for the Hall element. Resistor R4 provides the operating power to the Hall element, and resistor R5 provides a grounding loop for the Hall element. The preamplifier module includes an operational amplifier N1, resistors R6, R7, and R8. Operational amplifier N1 amplifies the weak electrical signal output from the Hall element in the first stage. Resistor R7 is a negative feedback resistor, which, together with resistor R6, determines the first-stage amplification factor. Resistor R8 is a signal transmission resistor. The secondary operation module includes an operational amplifier N2, resistors R9, R10, and R11, and capacitor C1. Operational amplifier N2... The pre-amplified signal is amplified again. Resistors R9 and R10 form a voltage divider circuit, and resistor R11 is a negative feedback resistor, which, together with resistor R8, determines the second-stage amplification factor. Capacitor C1 and resistor R10 form a low-pass filter circuit. The output drive module includes a signal output interface VOUT, resistor R12, indicator light VL, and pointer voltmeter PV. Among them, the signal output interface VOUT is the external output terminal, resistor R12 is the current-limiting resistor for indicator light VL, and pointer voltmeter PV is used to display the output voltage value in real time.
2. The Hall effect pressure sensor according to claim 1, characterized in that, The first pin of the Hall effect pressure sensing element is electrically connected to a resistor R4 and then electrically connected to the power supply VIN terminal. The third pin of the Hall effect pressure sensing element is electrically connected to a resistor R5 and then grounded.
3. A Hall effect pressure sensor according to claim 1, characterized in that, The second pin of the Hall effect pressure sensing element is electrically connected to one end of a resistor R6, the other end of resistor R6 is electrically connected to resistor R3, the power supply VIN terminal is electrically connected to resistor R1, resistor R1 is electrically connected to one end of a variable resistor RP, the other end of the variable resistor RP is electrically connected to resistor R2 and then grounded, and resistor R3 is electrically connected to the variable terminal of the variable resistor RP.
4. A Hall effect pressure sensor according to claim 1, characterized in that, The fourth pin of the Hall effect pressure sensing element is electrically connected to the non-inverting input of operational amplifier N1, and the inverting input of operational amplifier N1 is electrically connected to the other end of resistor R6 and then electrically connected to the second pin of the Hall effect pressure sensing element.
5. A Hall effect pressure sensor according to claim 1, characterized in that, The output terminal of operational amplifier N1 is electrically connected to one end of resistor R7, and the other end of resistor R7 is electrically connected to the inverting input terminal of operational amplifier N1.
6. A Hall effect pressure sensor according to claim 1, characterized in that, The output of operational amplifier N1 is also electrically connected to resistor R8, and resistor R8 is electrically connected to the inverting input of operational amplifier N2.
7. A Hall effect pressure sensor according to claim 1, characterized in that, The inverting input of operational amplifier N2 is also electrically connected to a resistor R11, which is electrically connected to the output of operational amplifier N2.
8. A Hall effect pressure sensor according to claim 1, characterized in that, The positive input terminal of operational amplifier N2 is electrically connected to capacitor C1, resistor R10, and resistor R9, respectively. Capacitor C1 and resistor R10 are grounded, and resistor R9 is electrically connected to the power supply VIN terminal.
9. A Hall effect pressure sensor according to claim 1, characterized in that, The operational amplifier N2 has a signal output interface VOUT at its output terminal.
10. A Hall effect barometric pressure sensor according to claim 1, characterized in that, The output terminal of operational amplifier N2 is electrically connected to resistor R12, resistor R12 is electrically connected to indicator light VL, and the output terminal of operational amplifier N2 is electrically connected to pointer voltmeter PV.