A voltage mode pressure sensor

Abstract

The utility model relates to pressure sensor technical field especially relates to a voltage type pressure sensor, including current type pressure sensor and precision resistor, both ends of precision resistor with current output port connection of current type pressure sensor are connected, the utility model discloses a current type pressure sensor is connected with precision resistor to current type pressure sensor is changed into voltage type pressure sensor, can reduce the production manufacturing cost, shortens the production cycle.

Description

Technical Field

[0001] This utility model relates to the field of pressure sensor technology, and in particular to a voltage-type pressure sensor. Background Technology

[0002] Currently, pressure sensors include two types: current-type pressure sensors and voltage-type pressure sensors. Voltage-type pressure sensors convert pressure into a voltage signal through piezoresistive, piezoelectric, or capacitive effects. Their advantages include direct output of a readable voltage and simple signal processing. Current-type pressure sensors, on the other hand, convert pressure signals into current signals. Their advantages include strong anti-interference capabilities and long transmission distances. The principles and costs of these two types of pressure sensors differ; for the same level of accuracy, voltage-type pressure sensors are more expensive than current-type pressure sensors, and they are also suitable for different applications.

[0003] In some applications, high-precision voltage pressure sensors are often required. However, high-precision voltage pressure sensors are expensive, and they require special design and manufacturing based on accuracy requirements, resulting in long production cycles and impacting production schedules. Utility Model Content

[0004] To address at least one of the aforementioned technical problems, this invention proposes a voltage-type pressure sensor.

[0005] According to some embodiments of the present invention, a voltage-type pressure sensor is provided, including a current-type pressure sensor and a precision resistor, wherein the two ends of the precision resistor are connected to the current output port of the current-type pressure sensor.

[0006] Based on the above solution, by connecting the current pressure sensor with a precision resistor, the current pressure sensor can be converted into a voltage pressure sensor, which can reduce manufacturing costs and shorten the production cycle.

[0007] In some possible implementations, the voltage-type pressure sensor further includes a control module and a differential analog-to-digital converter (ADC), wherein the input port of the differential ADC is connected to both ends of the precision resistor, and the output port of the differential ADC is connected to the control module.

[0008] Based on the above scheme, obtaining the voltage across the precision resistor using a differential analog-to-digital converter can avoid the impact of connection line losses on the test results.

[0009] In some possible implementations, a current detector is also included, which is disposed in the connection loop between the current-type pressure sensor and the precision resistor, and the detection output terminal of the current detector is connected to the control module.

[0010] Based on the above scheme, by setting a current detector, the current detector detects the output current of the current-type pressure sensor and feeds it back to the control module. The control module can determine the output voltage based on the resistance of the precision resistor and the detected current, thereby verifying whether the detected voltage is accurate and improving the detection accuracy.

[0011] In some possible implementations, the precision resistor includes an electronic potentiometer connected to the control module.

[0012] Based on the above scheme, the control module can adjust the resistance of the electronic potentiometer to adjust the range of the output voltage and improve the application compatibility of the sensor.

[0013] In some possible implementations, the precision resistor comprises two or more resistors connected in parallel, each resistor branch having a switch connected to the control module.

[0014] Based on the above scheme, the control module can control the switching state of different branches, thereby adjusting the resistance value of the precision resistor to adjust the range of the output voltage and improve the application compatibility of the sensor.

[0015] In some possible implementations, the precision resistor includes a multiplexer module and two or more resistors with different resistance values. The first end of any of the resistors is connected to the first current output terminal of the current-type pressure sensor, and the second end of the resistor is individually connected to a stationary contact of the multiplexer module. The common contact of the multiplexer module is connected to the second current output terminal of the current-type pressure sensor.

[0016] Based on the above scheme, the control module can adjust the switching state of the multiplexer module, thereby adjusting the resistance value of the precision resistor to adjust the range of the output voltage and improve the application compatibility of the sensor.

[0017] In some possible implementations, the control module includes a microcontroller in which the differential analog-to-digital converter is integrated.

[0018] Based on the above scheme, setting a microcontroller with an integrated differential analog-to-digital converter as the control module can simplify the overall structure of the sensor.

[0019] In some possible implementations, the voltage-type pressure sensor further includes a display module that is communicatively connected to the control module.

[0020] Based on the above solution, the display module can independently display the output pressure signal and the corresponding pressure value, which is convenient for debugging and testing.

[0021] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the present invention.

[0022] Other features and aspects of the present invention will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0023] To more clearly illustrate the technical solutions and advantages in the embodiments or prior art of this specification, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A first structural block diagram of a voltage-type pressure sensor according to an embodiment of the present invention is shown.

[0025] Figure 2 A circuit diagram of a voltage-type pressure sensor according to an embodiment of the present invention is shown.

[0026] Figure 3 A structural diagram of a current-type pressure sensor according to an embodiment of the present invention is shown;

[0027] Figure 4 This diagram shows a circuit connection diagram of a current-type pressure sensor and a precision resistor according to an embodiment of the present invention.

[0028] Figure 5 A second structural block diagram of a voltage-type pressure sensor according to an embodiment of the present invention is shown.

[0029] Figure 6 A third structural block diagram of a voltage-type pressure sensor according to an embodiment of the present invention is shown;

[0030] Figure 7 A first circuit diagram of a precision resistor according to an embodiment of the present invention is shown.

[0031] Figure 8 A second circuit diagram of a precision resistor according to an embodiment of the present invention is shown. Detailed Implementation

[0032] The technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this specification, and not all embodiments. Based on the embodiments in this specification, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0033] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or server that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0034] Various exemplary embodiments, features, and aspects of the present invention will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0035] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0036] In this document, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Furthermore, the term "at least one" in this document means any combination of at least two of any one or more elements. For example, including at least one of A, B, and C can mean including any one or more elements selected from the set consisting of A, B, and C.

[0037] Furthermore, to better illustrate this utility model, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this utility model can be implemented without certain specific details. In some instances, methods, means, components, and circuits well-known to those skilled in the art have not been described in detail in order to highlight the main points of this utility model.

[0038] Currently, pressure sensors include two types: current-type pressure sensors and voltage-type pressure sensors. Voltage-type pressure sensors convert pressure into a voltage signal through piezoresistive, piezoelectric, or capacitive effects. Their advantages include direct output of a readable voltage and simple signal processing. Current-type pressure sensors, on the other hand, convert pressure signals into current signals. Their advantages include strong anti-interference capabilities and long transmission distances. The principles and costs of these two types of pressure sensors differ; for the same level of accuracy, voltage-type pressure sensors are more expensive than current-type pressure sensors, and they are also suitable for different applications.

[0039] In certain applications, high-precision voltage-type pressure sensors are often required. For example, in engine technology development, engineering-grade high-precision pressure sensors are frequently used to measure the pressure at various locations in the engine's intake, exhaust, and fuel lines to accurately detect and control the engine's operating status. Since devices capable of receiving pressure signals in automotive engineering are generally voltage-based, devices that directly receive current-type pressure signals are uncommon, thus necessitating high-precision voltage-type pressure sensors. However, the high cost of high-precision voltage-type pressure sensors, coupled with the need for custom design and manufacturing based on accuracy requirements, leads to long production cycles and procurement delays, ultimately impacting production schedules.

[0040] To address the aforementioned technical problems, this utility model provides a voltage-type pressure sensor. Please refer to... Figure 1-2 The voltage-type pressure sensor includes a current-type pressure sensor and a precision resistor. The two ends of the precision resistor are connected to the current output interface of the current-type pressure sensor. Based on this design, the voltage-type pressure sensor is a modification of the current-type pressure sensor. It possesses the strong anti-interference capability of the current-type pressure sensor while also being able to output a voltage signal. This allows it to be applied in scenarios requiring voltage-type pressure sensors, reducing manufacturing costs and improving production efficiency.

[0041] In this embodiment, please refer to Figure 3 The current-type pressure sensor includes four pins: sensor power supply positive A, sensor power supply negative B, current output positive C, and current output negative D. Sensor power supply positive A and sensor power supply negative B form the sensor power supply interface, which is used to connect an external DC voltage source. Current output positive C and current output negative D form the current output interface. A precision resistor is set between the current output interfaces.

[0042] A precision resistor is a high-precision, high-stability electronic component that possesses advantages such as high precision, high stability, small size and light weight, high mechanical strength, and excellent high-frequency characteristics. This embodiment does not limit the specific type of precision resistor. Specifically, on the one hand, it does not limit the material of the precision resistor; it can be a metal film precision resistor, a wire-wound precision resistor, or a metal foil precision resistor, etc. On the other hand, it does not limit the form of the precision resistor; it can be a single precision resistor or multiple precision resistors, or it can be other resistor forms made of precision resistor materials, such as variable resistors.

[0043] In one specific embodiment, please refer to Figure 4 The precision resistor can be configured as a single precision resistor F, with its two ends connected to the positive current output terminal C and the negative current output terminal D of the current-type pressure sensor, respectively. When using a sensor with this structure, the pressure acquisition port of the current-type pressure sensor is installed at a designated location, and a voltage detection device is used to obtain the voltage across the precision resistor F, thereby obtaining the actual pressure value.

[0044] In some embodiments, please refer to Figure 5 The voltage-type pressure sensor also includes a control module and a differential analog-to-digital converter (ADC). The input port of the differential ADC is connected to both ends of a precision resistor, and the output port of the differential ADC is connected to the control module. Based on this structure, the differential ADC can accurately acquire the voltage across the precision resistor. Since the current sampled by the differential ADC is extremely small, the voltage drop generated by the differential ADC is negligible, thus avoiding the problem of inaccurate detection caused by voltage drop in the sampling line.

[0045] In a further embodiment, please refer to Figure 6 The voltage-type pressure sensor also includes a current detector, which is located in the connection circuit between the current-type pressure sensor and the precision resistor. The detection output terminal of the current detector is connected to the control module. The function of the current detector is to acquire the current output of the current-type pressure sensor. Based on the detected current value and the resistance value of the precision resistor, the voltage across the precision resistor can be calculated and compared with the voltage value detected by the differential analog-to-digital converter to verify the accuracy of the detection. In this embodiment, the selection of the current detector is not limited; the current detector can be a current detection chip, a current transformer, or a differential amplifier circuit, etc. It should be understood that the connection relationship between the current detector and other components of the circuit is adjusted and determined according to the actual model of the current detector.

[0046] In the above embodiments, the purpose of setting a control module in the voltage-type pressure sensor is to process the voltage signal first. Compared with directly outputting the voltage across the two ends of the precision resistor, the control module can detect and preprocess the voltage signal to ensure the accuracy of the detection result. Furthermore, it can flexibly adjust the corresponding output signal according to the application scenario. For example, it can calculate the pressure value based on the detected voltage signal and directly output a digital signal representing the current pressure value.

[0047] In a further embodiment, to simplify the overall structure of the sensor and improve application compatibility and flexibility, the control module can be configured as a microcontroller with an integrated differential analog-to-digital converter. Preferably, the microcontroller may also integrate a current detector.

[0048] In some embodiments, the voltage-type pressure sensor may further include a display module, which is communicatively connected to the control module. The display module can display detection parameters such as the output current value of the current-type pressure sensor, the voltage across the precision resistor, and the current pressure value, allowing the user to intuitively determine the detection results. In one specific embodiment, the display module is an LED screen, and the control module is a microcontroller; the LED screen is connected to the microcontroller via serial communication.

[0049] In this invention, the precision resistor has a resistance adjustment function. Based on this configuration, the range of the voltage signal output by the voltage-type pressure sensor can be flexibly adjusted, that is, the voltage output range is adjustable, so as to facilitate application in different usage scenarios. This embodiment does not limit the specific implementation method of the resistance adjustment function. That is to say, the resistance adjustment function can be implemented based on the characteristics of the resistor itself, such as a variable resistor, or it can be implemented based on a switching circuit.

[0050] In some embodiments, the precision resistor includes an electronic potentiometer connected to a control module. The electronic potentiometer is a type of variable resistor; the control module sends digital signals to the electronic potentiometer to control and adjust its resistance value, thereby achieving adjustable voltage output range.

[0051] In some embodiments, the resistance adjustment function of a precision resistor is implemented based on the switching of multiple resistors. Specifically, please refer to... Figure 7 The precision resistor comprises two or more resistors connected in parallel, with a switch on each resistor branch connected to the control module. Based on this circuit structure, the control module controls the on / off state of the switches. When one switch is on, the resistor in that branch is connected to the current output port of the current-type pressure sensor. By controlling the number of on branches, the number of parallel resistors can be changed, thereby changing the resistance value and achieving adjustable voltage output range.

[0052] In some embodiments, the precision resistor can also be implemented based on a multiplexed switching module. Specifically, please refer to... Figure 8 The precision resistor includes a multiplexer module and two or more resistors with different resistance values. The first end of any resistor is connected to the first current output terminal of the current-type pressure sensor, and the second end of the resistor is individually connected to a stationary contact of the multiplexer module. The common contact of the multiplexer module is connected to the second current output terminal of the current-type pressure sensor. Based on this circuit structure, the control module controls the connection of a stationary contact of the multiplexer module to the common contact, thereby switching the resistors of different resistance values ​​connected to the current output port of the current-type pressure sensor, achieving adjustable voltage output range.

[0053] Both of the above embodiments are based on switching circuits to achieve resistance adjustment. The advantage of the multi-resistor combined with branch switch is that the adjustment range is large, and the resistance values ​​of the branch resistors can be the same or different. The advantage of the multiplexed switch module is that only one type of resistor needs to be connected each time, making adjustment simple and quick.

[0054] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical applications, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A voltage-type pressure sensor, characterized in that, The device includes a current-type pressure sensor and a precision resistor, with both ends of the precision resistor connected to the current output port of the current-type pressure sensor; the voltage-type pressure sensor also includes a control module and a differential analog-to-digital converter, with the input port of the differential analog-to-digital converter connected to both ends of the precision resistor, and the output port of the differential analog-to-digital converter connected to the control module.

2. The voltage-type pressure sensor according to claim 1, characterized in that, It also includes a current detector, which is installed in the connection circuit between the current-type pressure sensor and the precision resistor, and the detection output terminal of the current detector is connected to the control module.

3. The voltage-type pressure sensor according to claim 1, characterized in that, The precision resistor includes an electronic potentiometer, which is connected to the control module.

4. The voltage-type pressure sensor according to claim 1, characterized in that, The precision resistor includes two or more resistors connected in parallel, and each resistor branch is equipped with a switch, which is connected to the control module.

5. The voltage-type pressure sensor according to claim 1, characterized in that, The precision resistor includes a multiplex switch module and two or more resistors with different resistance values. The first end of any of the resistors is connected to the first current output terminal of the current-type pressure sensor, and the second end of the resistor is individually connected to a stationary contact of the multiplex switch module. The common contact of the multiplex switch module is connected to the second current output terminal of the current-type pressure sensor.

6. The voltage-type pressure sensor according to claim 1, characterized in that, The control module includes a microcontroller, in which the differential analog-to-digital converter is integrated.

7. The voltage-type pressure sensor according to claim 1, characterized in that, The voltage-type pressure sensor also includes a display module, which is communicatively connected to the control module.

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