Probe signal switching output device

Abstract

The utility model discloses a probe signal switching output device, which belongs to the technical field of signal processing and comprises three probe interfaces (H1), a one-out-of-three analog switch (SW1), an ADS1110A1DBVRADC analog-to-digital converter (U1), an analog signal output end (P5), digital signal output ends (P3 and P4), a power supply port (P2) and a grounding port (P1). By adopting the multiplexing architecture of the one-out-three analog switch and the single ADC module and combining the physical isolation design of the analog / digital double-output channel, intelligent selection, low-cost conversion and high-reliability output of multi-probe signals are realized, and the defects in the prior art are overcome.

Description

TECHNICAL FIELD

[0001] The utility model relates to signal processing technical field more specifically, relate to a kind of probe signal switching output device. BACKGROUND

[0002] In modern electronic equipment and measurement system, multi-probe signal acquisition and processing is the key requirement to realize accurate monitoring and analysis. Industrial automation, environmental monitoring, equipment diagnosis and other fields often need to access multiple sensors (such as temperature, pressure, vibration probe) at the same time to obtain multi-dimensional physical quantity data. However, there are the following technical bottlenecks in practical application:

[0003] 1. The diversity of signal type and amplitude: the output signals of different probes may be analog voltage, current or frequency signals, and the amplitude range differs significantly, and traditional devices are difficult to adapt to multiple signal types flexibly;

[0004] 2. Resource waste and high cost: existing solutions usually use fixed connection method, that is, each probe is independently configured with analog-to-digital converter (ADC), resulting in hardware redundancy, especially in scenarios where only single-channel real-time processing is required, the deployment of multiple ADC modules significantly increases cost and power consumption;

[0005] 3. Lack of switching flexibility: some systems realize multi-probe selection through mechanical switch, but noise is easily introduced during switching, and there is no compatible design for analog signal direct-through and digital signal conversion, making it difficult to meet the input requirements of different backend devices;

[0006] Signal integrity problem: when analog and digital signals are not isolated, high-frequency noise can cause signal distortion, affecting measurement accuracy.

[0007] To solve the above problems, although there are MUX and ADC combination solutions in existing technology, there are still the following defects: for example, multi-stage switching increases signal path delay; multiple ADC modules work in parallel, resulting in increased circuit complexity and cost; and simple mechanical switch cannot realize intelligent guidance of signal path (direct-through or conversion). Therefore, a high-integration, cost-controlled signal processing device that supports flexible switching and dual-mode output is needed to solve the problems of selection, adaptation and efficient conversion in multi-probe signal acquisition. SUMMARY

[0008] 1. The technical problem to be solved:

[0009] In view of the problems in the prior art, the utility model discloses a probe signal switching output device, through adopting three analog switch and single ADC module multiplex architecture, combining the physical isolation design of analog / digital dual output channel, realize the intelligent selection of multi-probe signal, low cost conversion and high reliability output, fill the gap of prior art.

[0010] 2. Technical scheme:

[0011] To solve the above problems, the utility model adopts the technical scheme as follows.

[0012] A probe signal switching output device, comprising:

[0013] Three probe interfaces (H1) are used for receiving analog signal input of external probes.

[0014] Three analog switches (SW1) are electrically connected with the three probe interfaces (H1) respectively.

[0015] Analog-to-digital converter (U1) adopts ADS1110A1DBVRADC module, and the input end is connected with the output end of the three analog switches (SW1).

[0016] Analog signal output end (P5) is directly connected with the output end of the three analog switches (SW1).

[0017] Digital signal output end (P3, P4) is connected with the digital output end of the analog-to-digital converter (U1).

[0018] The three analog switches (SW1) are configured to selectively conduct the analog signal of the selected probe interface to the analog signal output end (P5) or the analog-to-digital converter (U1).

[0019] Further improvement lies in that the power input end of the analog-to-digital converter (U1) is connected with a power supply port (P2), and the grounding end is connected with a grounding port (P1).

[0020] Further improvement lies in that the three analog switches (SW1) are provided with manual selection switches for manually switching signal channels on site.

[0021] Further improvement lies in that the analog signal output end (P5) and the digital signal output end (P3, P4) are provided with independent pad structures at the edge of the PCB.

[0022] Further improvement lies in that the three probe interfaces (H1) are composed of three groups of spring needle connectors arranged side by side.

[0023] 3. Advantageous effects:

[0024] Compared with the prior art, the technical scheme provided by the utility model has the beneficial effects that:

[0025] (1) Cost control: only using single piece ADS1110A1DBVRADC module to realize three channel multiplexing, compared with traditional multi-ADC scheme, cost is reduced by more than 60%.

[0026] (3) Flexible output: support analog signal direct through and digital signal conversion double mode, adapt to the input requirement of different back-end equipment.

[0027] (4) Anti-interference ability: through physical isolation and ground plane segmentation design, signal distortion rate is less than 1%, ensure high-precision output.

[0028] (5) Expandability: by replacing three-to-one analog switch (such as upgrading to four-to-one switch) can expand more probe interface, adapt to complex scene demand.

[0029] It should be noted that the structures not introduced by the utility model are the same as the prior art or can be realized by using the prior art, and will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is the principle block diagram of the utility model as a whole;

[0031] Figure 2 It is the layout schematic view of the utility model PCB;

[0032] Figure 3 It is the 3D preview view of the utility model PCB. DETAILED DESCRIPTION

[0033] In order to facilitate understanding of the utility model, the utility model will be described more fully below with reference to the relevant drawings, and the drawings show several embodiments of the utility model, however, the utility model can be realized in many different forms, and is not limited to the embodiments described herein, on the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive. EMBODIMENT

[0034] The embodiment provides a kind of probe signal switching output device, its specific structure as shown in Figure 1 It is mainly used for flexible switching and output of industrial field multiple probe signals.The utility model is described in detail below in combination with specific embodiments.

[0035] 1. Device overall architecture

[0036] As Figures 1-3As shown, the device includes three probe interfaces (H1), a three-to-one analog switch (SW1), an ADS1110A1DBVR ADC analog-to-digital converter (U1), an analog signal output terminal (P5), a digital signal output terminal (P3, P4), a power supply port (P2), and a ground port (P1). Each component is integrated through a PCB board, and the specific connection relationship is as follows:

[0037] Probe interface (H1): Three sets of side-by-side spring needle connectors are used to connect three external probes (such as temperature, pressure, and vibration sensors). The elastic contact design of the spring needle connector can ensure reliable connection when the probe is inserted.

[0038] Three-to-one analog switch (SW1): Its three input terminals are connected to the analog signal output terminals of the three probe interfaces (H1), and the output terminal is divided into two paths: one path is directly connected to the analog signal output terminal (P5), and the other path is connected to the input terminal of the analog-to-digital converter (U1).

[0039] Analog-to-digital converter (U1): TI's ADS1110A1DBVR ADC module is selected, and its power supply pin (VDD) is connected to a 5V DC power supply through the power supply port (P2), and the ground pin (GND) is grounded through the ground port (P1). The digital signal after analog-to-digital conversion is output to the digital signal output terminal (P3, P4) through the I²C interface.

[0040] 2. Signal switching and output function implementation

[0041] Signal switching control: The three-to-one analog switch (SW1) is configured with a manual selection switch (such as a rotary switch or a dial switch), and the user manually switches to the target probe channel (channel 1 / 2 / 3) according to the on-site demand.

[0042] Dual output mode:

[0043] Analog signal direct output: When the original analog signal needs to be preserved, SW1 directly conducts the signal of the selected probe to the analog signal output terminal (P5), and at this time the analog-to-digital converter (U1) does not work.

[0044] Digital signal conversion output: When digital signals are needed, SW1 inputs the signal to the analog-to-digital converter (U1), and the converted 16-bit digital signal is output to the external controller (such as PLC or single-chip microcomputer) through P3 (SCL), P4 (SDA).

[0045] 3. PCB layout design

[0046] As shown in Figures 2-3 , each port is designed with physical isolation to reduce signal interference:

[0047] Output terminal isolation: the analog signal output terminal (P5) and the digital signal output terminal (P3, P4) are arranged on the two side edges of the PCB, respectively, and an independent pad structure is adopted to avoid cross wiring.

[0048] Power supply and ground optimization: the power supply port (P2) and the ground port (P1) are arranged close to the analog-to-digital converter (U1), the power supply wiring is thickened and a decoupling capacitor is configured to improve conversion stability.

[0049] 4. Workflow

[0050] S1, the probe signal is input to SW1 through H1;

[0051] S2, the user selects the target probe signal through the manual switch of SW1;

[0052] S3, switch the output mode according to the requirement:

[0053] S4, straight-through mode: the signal is directly output to P5;

[0054] S5, conversion mode: the signal is converted into a digital signal by U1 and then output to P3 and P4.

[0055] The above structure and working method realize efficient switching and flexible output of multiple probe signals, and are especially suitable for industrial automation, environmental monitoring and other scenes requiring multiple sensor integration.

[0056] The above-described embodiments only express certain embodiments of the present application, and the description is more specific and detailed, but it should not be understood as limiting the scope of the present application; it should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application; therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A probe signal switching output device, characterized by, The application relates to a three-probe interface analog signal input device, which comprises the following parts: three probe interfaces (H1) for receiving analog signal inputs of external probes; a three-to-one analog switch (SW1) with input ends electrically connected with the three probe interfaces (H1) respectively; an analog-to-digital converter (U1) adopting an ADS1110A1DBVRADC module, with an input end connected with an output end of the three-to-one analog switch (SW1); an analog signal output end (P5) directly connected with an output end of the three-to-one analog switch (SW1); digital signal output ends (P3, P4) connected with digital output ends of the analog-to-digital converter (U1); wherein the three-to-one analog switch (SW1) is configured to selectively conduct analog signals of selected probe interfaces to the analog signal output end (P5) or the analog-to-digital converter (U1).

2. The probe signal switching output device of claim 1, wherein: A power supply port (P2) is connected with a power input end of the analog-to-digital converter (U1), and a grounding port (P1) is connected with a grounding end.

3. The probe signal switching output device of claim 2, wherein: The three-to-one analog switch (SW1) is provided with a manual selection switch for manually switching signal channels on site.

4. The probe signal switching output device according to any one of claims 1-3, characterized in that: The analog signal output end (P5) and the digital signal output ends (P3, P4) are arranged on the edge of a PCB in an independent pad structure.

5. The probe signal switching output device of claim 4, wherein: The three probe interfaces (H1) are composed of three groups of spring needle connectors arranged side by side.

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