A dual-path pressure signal acquisition module

Abstract

The utility model relates to electromechanical detection instrument technical field, specifically provide a kind of two-way pressure signal acquisition module, including power supply and two-way load, two-way load is connected with same reference source, and there is operational amplifier, triode and sampling resistance on the circuit of each load, sampling resistance is used to collect load output current, and it is converted into voltage feedback signal, operational amplifier carries out filter amplification to voltage feedback signal and reference voltage provided by reference source, and input triode, control the current flow of triode, realize load constant-current power supply.The acquisition module of the application realizes the function of preventing short circuit, and signal input has high impedance characteristic.

Description

Technical Field

[0001] This utility model belongs to the field of electromechanical testing instrument technology, and in particular relates to a dual-channel pressure signal acquisition module. Background Technology

[0002] In electronic system development, PCB module design is a core component, as its performance and layout directly impact the functionality and stability of the entire electronic system. With the development of industrial automation and intelligence, pressure signal acquisition technology has been widely applied in numerous fields, such as industrial control, environmental monitoring, and medical equipment, all requiring high-precision, high-stability pressure signal acquisition modules to achieve real-time monitoring and control of pressure parameters.

[0003] However, existing pressure signal acquisition technologies still have some shortcomings in practical applications. First, regarding sensor power supply, traditional power supply methods often lack short-circuit protection; a short circuit could damage the sensor or affect the normal operation of the entire system. Second, in terms of signal processing, the low input impedance makes the signal susceptible to external interference, resulting in low accuracy of the acquired signal. Furthermore, the stability and reliability of the output signal need improvement, especially in complex working environments where insufficient anti-interference capability may affect the normal operation of subsequent equipment.

[0004] Meanwhile, existing pressure signal acquisition modules also have some structural design problems. For example, the size and shape of the circuit board are not optimized, making installation and maintenance inconvenient; the component layout is not reasonable, affecting the efficiency and stability of signal transmission. These problems limit the application and development of pressure signal acquisition technology in a wider range of fields. Utility Model Content

[0005] In view of this, the present invention aims to provide a dual-channel pressure signal acquisition module, which uses a sampling resistor to provide feedback on the load current and uses an operational amplifier and a transistor to provide constant current power to the load, thereby realizing the short-circuit protection function of the PCB board and comprehensively optimizing the device layout and interface functions.

[0006] To achieve the above objectives, the technical solution created by this utility model is implemented as follows:

[0007] This utility model provides a dual-channel pressure signal acquisition module, including: a power supply and two loads, the two loads being connected to the same reference source, and each load circuit including: an operational amplifier, a transistor and a sampling resistor;

[0008] The reference source is used to provide a reference voltage for the operational amplifier;

[0009] The sampling resistor is used to detect the signal acquired by the corresponding load and feed it back to the operational amplifier;

[0010] The operational amplifier takes a reference voltage and a load acquisition signal as inputs and performs differential amplification on the load acquisition signal and reference voltage provided by the sampling resistor. The output of the operational amplifier is connected to the base of the transistor and is used to adjust the output current of the transistor's collector to achieve constant current power supply to the load.

[0011] Preferably, the sampling resistor is placed at the input terminal of the operational amplifier.

[0012] Preferably, the sampling resistor is connected to the corresponding load.

[0013] Preferably, the operational amplifier is a differential amplifier.

[0014] Preferably, the load is a pressure sensor.

[0015] Preferably, it also includes: each load connection has an output module, which is used to convert and output the load acquisition signal.

[0016] Preferably, the load includes a constant current power supply input pin, a constant current power supply output pin, a load acquisition signal output pin, and a shielded ground signal pin.

[0017] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0018] This invention employs a constant current power supply, achieving short-circuit protection for the PCB board, enhancing circuit stability and reliability, and reducing the risk of equipment damage due to circuit failures. Furthermore, this invention enables dual-channel sensor data acquisition, with both sensors sharing the same adjustable reference voltage, improving system functionality and applicability, making it suitable for applications requiring simultaneous monitoring of multiple pressure points.

[0019] This invention supports a wide power supply range of 5~30VDC, which can adapt to more application scenarios and power conditions. Furthermore, the constant current signal is processed by an operational amplifier and has high impedance characteristics, which reduces its impact on the sensor load and improves the accuracy of signal acquisition.

[0020] This utility model also optimizes the design of circuit board size, component layout and interface functions, simplifies PCB design structure, and has the advantages of simple structural design, convenient installation and replacement, and stable function, while reducing maintenance costs and operation difficulty. Attached Figure Description

[0021] The accompanying drawings, which form part of this invention, are used to provide a further understanding of this invention. The illustrative embodiments and descriptions of this invention are used to explain this invention and do not constitute an undue limitation of this invention. In the drawings:

[0022] Figure 1 This is a circuit structure diagram of a dual-channel pressure signal acquisition module provided according to an embodiment of the present utility model;

[0023] Figure 2 This is a PCB design drawing of a dual-channel pressure signal acquisition module provided according to an embodiment of the present utility model.

[0024] The reference numerals in the figures include:

[0025] Reference source 1, power supply 2, first load 3, first operational amplifier 4, first transistor 5, first sampling resistor 6, first output module 7, second load 8, second operational amplifier 9, second transistor 10, second sampling resistor 11, second output module 12. Detailed Implementation

[0026] To make the purpose, technical solution, and advantages of this utility model clearer, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and do not constitute a limitation thereof. Similar elements in different embodiments are referred to by associated similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of this utility model. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, some operations related to this utility model are not shown or described in the specification. This is to avoid obscuring the core parts of this utility model with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0027] It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other to form various implementation methods. Furthermore, the steps or actions in the method description can be rearranged or adjusted in a manner readily apparent to those skilled in the art. Therefore, the various orders in the specification and drawings are merely for the clear description of a particular embodiment and do not imply a mandatory order, unless otherwise stated that a particular order must be followed.

[0028] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] Please see Figure 1 In one embodiment of this utility model, a dual-channel pressure signal acquisition module is provided. This module achieves dual-channel pressure signal acquisition through different electronic component connection layouts. The PCB electrical design, dimensions, shape, and installation method of this module are optimized to overcome the shortcomings of traditional pressure acquisition modules. Specifically, the dual-channel pressure signal acquisition module includes: a reference source 1, a power supply 2, and two loads, namely a first load 3 and a second load 8. Both the first load 3 and the second load 8 are pressure sensors or other electronic devices with pressure sensing capabilities. Both the first load 3 and the second load 8 employ a constant current power supply design to avoid short-circuit faults that could cause the acquisition module and loads to burn out.

[0032] The constant current power supply circuits for the first load 3 and the second load 8 are designed identically, and they share the same reference source 1. Reference source 1 provides the same reference voltage to both circuits. Specifically, the constant current power supply circuit for the first load 3 includes a first operational amplifier 4, a first transistor 5, and a first sampling resistor 6; the constant current power supply circuit for the second load 8 includes a second operational amplifier 9, a second transistor 10, and a second sampling resistor 11. The component parameters and circuit layout of the two constant current power supply circuits are completely identical. The circuit structure and working principle are described below using the constant current power supply circuit for the first load 3 as an example:

[0033] Reference source 1 is connected to the non-inverting inputs (marked as "+" in the diagram) of the first operational amplifier 4 and the second operational amplifier 9, respectively, to provide reference voltages for the first operational amplifier 4 and the second operational amplifier 9. It should be noted that the reference voltage provided by reference source 1 is adjustable, depending on the actual design requirements and power supply conditions.

[0034] The inverting input terminal (marked as "-" in the figure) of the first operational amplifier 4 is connected to the first sampling resistor 6 and the first load 3, and the other end of the first sampling resistor 6 is grounded. The first sampling resistor 6 is used to detect the acquisition signal of the first load 3 in real time, that is, the current signal of the first load 3. Since there is a voltage drop across the first sampling resistor 6, the current signal of the first load 3 can be converted into a voltage signal using the first sampling resistor 6. This voltage signal is then fed back to the inverting input terminal of the first operational amplifier 4 as the load acquisition signal. The reference voltage and the load acquisition signal are used as the inputs of the first operational amplifier 4, and are amplified by the first operational amplifier 4. In this embodiment of the invention, both the first operational amplifier 4 and the second operational amplifier 9 are differential amplifiers, which are used for differential filtering and amplification.

[0035] The output of the first operational amplifier 4 is connected to the base of the first transistor 5. The emitter of the first transistor 5 is connected to the power supply 2, and the collector of the first transistor 5 is connected to the first load 3. Since this invention uses a constant current power supply, the power supply 2 can be designed with a wide voltage range of 5-24VDC or even 5-30VDC. The first operational amplifier 4 and the first transistor 5 form a constant current circuit. The differential output signal of the first operational amplifier 4 serves as the base input of the first transistor 5, controlling the base current of the first transistor 5 and thus controlling the conduction level of the first transistor 5. Specifically, the first operational amplifier 4 obtains the load acquisition signal through the negative feedback monitoring of the first sampling resistor 6, and adjusts the base current of the first transistor 5 according to the load acquisition signal, thereby generating a constant current between the collector and emitter of the first transistor 5. In this process, the first transistor 5 acts as a switch or amplifier to control the current value through the first load 3. Even if the input voltage or the resistance of the first load 3 changes, the first operational amplifier 4 can adjust the conduction level of the first transistor 5 to maintain a constant output current and achieve short-circuit protection.

[0036] The second operational amplifier 9, the second transistor 10, and the second sampling resistor 11 on the constant current circuit of the second load 8 are completely identical in circuit design and function to the constant current circuit of the first load 3, and will not be described in detail here.

[0037] The first load 3 and the second load 8 are also connected to a first output module 7 and a second output module 12, respectively. The first output module 7 and the second output module 12 are designed and functioned exactly the same. Taking the first output module 7 as an example, the first output module 7 is used to convert the load acquisition signal of the first load 3 into a 0 to 15mA current amplification output signal that can be directly used by subsequent devices.

[0038] In addition, the entire dual-channel pressure signal acquisition module is also equipped with a grounding module.

[0039] Based on the above circuit structure, further fabrications were made such as Figure 2 The PCB acquisition board shown measures 46mm × 36mm and has four positioning holes for mounting and securing. J1 is the external interface for the first load 3, J2 is the external interface for the second load 8, J3 is the output interface for the dual-channel pressure signal acquisition module, and J4 is the power supply interface for the dual-channel pressure signal acquisition module. Each load includes a constant current power input pin, a constant current power output pin, a load acquisition signal output pin, and a shielded ground signal pin. The specific pinouts and functions of the dual-channel pressure signal acquisition module are shown in the table below.

[0040] Pin 1 and its function

[0041]

[0042] The PCB acquisition board of the dual-channel pressure signal acquisition module of this utility model further adopts a surface copper-clad design. The copper-clad layer serves as an electromagnetic shielding layer, reducing the radiation and reception of electromagnetic waves, thereby reducing electromagnetic interference.

[0043] Furthermore, since the constant current power supply process of this utility model amplifies the load acquisition signal through an operational amplifier, the operational amplifier has a very high input impedance and a very low output impedance, which can effectively isolate the signal source and subsequent circuits, reduce the load effect on the signal source, and enable the dual-channel pressure signal acquisition module to have a high impedance function.

[0044] In summary, the above description is merely a preferred embodiment of this specification and is not intended to limit the scope of protection of this specification. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this specification should be included within the scope of protection of this specification.

[0045] The systems, apparatuses, modules, or units described in one or more of the above embodiments may be implemented by a computer chip or entity, or by a product having a certain function. A typical implementation device is a computer. Specifically, a computer may be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smartphone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or any combination of these devices.

[0046] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0047] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

Claims

1. A dual-channel pressure signal acquisition module, comprising a power supply and two loads, characterized in that, Both loads are connected to the same reference source, and each load circuit includes: an operational amplifier, a transistor, and a sampling resistor; The reference source is used to provide a reference voltage for the operational amplifier; The sampling resistor is used to detect the corresponding load acquisition signal and feed it back to the operational amplifier; The operational amplifier receives a reference voltage and a load acquisition signal as inputs. It is used to differentially amplify the load acquisition signal and reference voltage provided by the sampling resistor. The output of the operational amplifier is connected to the base of the transistor and is used to adjust the output current of the transistor's collector to achieve constant current power supply to the load.

2. The dual-channel pressure signal acquisition module according to claim 1, characterized in that, The sampling resistor is located at the input terminal of the operational amplifier.

3. The dual-channel pressure signal acquisition module according to claim 2, characterized in that, The sampling resistor is connected to the corresponding load.

4. The dual-channel pressure signal acquisition module according to claim 1, characterized in that, The operational amplifier is a differential amplifier.

5. The dual-channel pressure signal acquisition module according to claim 1, characterized in that, The load is a pressure sensor.

6. The dual-channel pressure signal acquisition module according to claim 1, characterized in that, Also includes: Each load connection has an output module, which is used to convert and output the load acquisition signal.

7. The dual-channel pressure signal acquisition module according to claim 1, characterized in that, The load includes a constant current power supply input pin, a constant current power supply output pin, a load acquisition signal output pin, and a shielded ground signal pin.

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