Multi-dynamic signal conditioning device and data acquisition instrument

Abstract

The utility model provides a multi-dynamic signal conditioning device and a data acquisition instrument, the device comprises a wiring terminal, a program control amplifier arranged at one side of the output end of the wiring terminal, and a signal conditioning module, the signal conditioning module comprises an RF radio frequency filter, a first measuring module and a second measuring module, the first measuring module is used for measuring the dynamic signals based on a controller, and the second measuring module is used for measuring the dynamic signals. Controlling a third resistor, a fifth resistor, a sixth resistor and a fourth capacitor to be switched on, and controlling the fourth resistor and a fifth capacitor to be switched on so as to realize signal measurement of the IEPE sensor; and the second measurement module is used for controlling the fourth resistor, the fifth resistor and the sixth resistor to be switched on and controlling the third resistor, the fourth capacitor and the fifth capacitor to be switched on based on the controller so as to realize signal measurement of the voltage sensor. By designing a signal conditioning module circuit and based on each measurement module, the same acquisition instrument can measure different types of electric signal vibration sensors at the same time, so that the requirements on the types of acquisition instruments in a dynamic monitoring application scene are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of structure monitoring, in particular to a multi-dynamic signal conditioning device and a data acquisition instrument. Background Art

[0002] At present, the dynamic signal conditioning circuit in the dynamic data acquisition instrument can only process a certain type of signal, and the circuit design is targeted. For example, it can measure dynamic voltage signals within the range of ±10V, but it cannot measure current, IEPE, dynamic bridge and other signals.

[0003] In the prior art, vibration sensors with different signal outputs are used for the structures under test according to the different monitoring targets and objects. This makes it only compatible with dynamic data acquisition equipment with a single signal, and it is not possible to simultaneously be compatible with vibration sensors with multiple types of signals. Either the number and type of vibration collectors must be increased, or secondary instruments must be added, both of which will increase system cost and complexity. Utility Model Content

[0004] In view of the deficiencies of the prior art, the purpose of the present invention is to provide a multi-dynamic signal conditioning device and a data acquisition instrument, aiming to solve the technical problem in the prior art that the data acquisition equipment can only be compatible with a single signal.

[0005] In order to achieve the above-mentioned purpose, the utility model is realized by the following technical scheme: a multi-dynamic signal conditioning device, comprising a wiring terminal for receiving a sensor signal, a programmable amplifier arranged on one side of an output end of the wiring terminal, and a signal conditioning module arranged between the programmable amplifier and the wiring terminal, the signal conditioning module comprising an RF radio frequency filter, the RF radio frequency filter comprising a first capacitor and a first resistor arranged on one side of a positive input end of the programmable amplifier, a second capacitor and a second resistor arranged on one side of a negative input end of the programmable amplifier, and a third capacitor arranged between the first capacitor and the second capacitor, the signal conditioning module also comprising a third resistor and a fourth resistor respectively arranged on both sides of the first resistor, and a fifth resistor and a sixth resistor respectively arranged on both sides of the second resistor, the RF radio frequency filter also comprising a first bias resistor and a second bias resistor respectively arranged on one side of the positive input end and the negative input end, the signal conditioning module also comprising a fourth capacitor arranged between the fourth resistor and the first bias resistor, and a fifth capacitor arranged between the sixth resistor and the second bias resistor;

[0006] A controller is provided on one side of the third resistor, the fourth resistor, the fourth capacitor and the fifth capacitor;

[0007] The signal conditioning module also includes a first measurement module and a second measurement module. The first measurement module is used to control the third resistor, the fifth resistor, the sixth resistor and the fourth capacitor to be connected, and control the fourth resistor and the fifth capacitor to be closed based on the controller, so as to realize the signal measurement of the IEPE sensor; the second measurement module is used to control the fourth resistor, the fifth resistor and the sixth resistor to be connected, and control the third resistor, the fourth capacitor and the fifth capacitor to be closed based on the controller, so as to realize the signal measurement of the voltage sensor.

[0008] According to one aspect of the above technical solution, the signal conditioning module further includes a seventh resistor disposed between the first resistor and the second resistor, and a controller is disposed on one side of the seventh resistor.

[0009] According to one aspect of the above technical solution, the signal conditioning module also includes a third measurement module, which is used to control the fourth resistor, the fifth resistor, the sixth resistor and the seventh resistor to be connected, and control the third resistor, the fourth capacitor and the fifth capacitor to be closed based on the controller, so as to realize signal measurement of the current sensor.

[0010] According to one aspect of the above technical solution, the signal conditioning module also includes a fourth measurement module, which is used to control the fourth resistor and the sixth resistor to be connected, and control the third resistor, the fifth resistor, the seventh resistor, the fourth capacitor and the fifth capacitor to be closed based on the controller, so as to realize signal measurement of the bridge sensor.

[0011] According to one aspect of the above technical solution, the controller is one or more of a signal relay, an analog switch or an optocoupler relay.

[0012] According to one aspect of the above technical solution, the multi-dynamic signal conditioning device also includes a power supply module, the power supply module includes a power supply module arranged on one side of the wiring terminal, a constant current source module is provided on one side of the power supply module, and an eighth resistor is provided between the constant current source module and the power supply module.

[0013] According to one aspect of the above technical solution, the power supply module further includes a constant voltage source module disposed on one side of the power supply module, and a ninth resistor is disposed between the constant voltage source module and the power supply module.

[0014] According to one aspect of the above technical solution, the power supply module further includes a bridge constant voltage source module, and a tenth resistor is provided between the bridge constant voltage source module and the power supply module.

[0015] On the other hand, the present application also provides a data acquisition instrument, including the multi-dynamic signal conditioning device in the above technical solution.

[0016] Compared with the prior art, the beneficial effect of the utility model lies in: by designing the signal conditioning module circuit and based on each measurement module, the same collector can simultaneously measure different types of electrical signal vibration sensors, thereby reducing the requirements on the type of collector in dynamic monitoring application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the circuit structure of the multi-dynamic signal conditioning device in the first embodiment of the utility model;

[0018] Figure 2 This is a schematic diagram of the circuit structure of the constant voltage source module in the first embodiment of the utility model;

[0019] Figure 3 This is a schematic diagram of the circuit structure of the constant current source module in the first embodiment of the utility model;

[0020] Figure 4 This is a schematic diagram of the circuit structure of the bridge constant voltage source module in the first embodiment of the utility model;

[0021] Description of main component symbols:

[0022] A first resistor 11, a second resistor 12, a third resistor 13, a fourth resistor 14, a fifth resistor 15, a sixth resistor 16, a seventh resistor 17, an eighth resistor 18, a ninth resistor 19, a tenth resistor 110, a first capacitor 21, a second capacitor 22, a third capacitor 23, a fourth capacitor 24, a fifth capacitor 25, a connection terminal 31, and a programmable amplifier 32;

[0023] The following specific implementation manner will further illustrate the present utility model in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0024] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented 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 present invention more thorough and comprehensive.

[0025] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0027] See also Figure 1 , shown is a schematic diagram of the circuit structure of the multi-dynamic signal conditioning device in the first embodiment of the utility model, as shown in the figure, including a wiring terminal for receiving a sensor signal, a programmable amplifier arranged on one side of the wiring terminal output end, and a signal conditioning module arranged between the programmable amplifier and the wiring terminal, the signal conditioning module includes an RF radio frequency filter, the RF radio frequency filter includes a first capacitor and a first resistor arranged on one side of the positive input end of the programmable amplifier, a second capacitor and a second resistor arranged on one side of the negative input end of the programmable amplifier, and a third capacitor arranged between the first capacitor and the second capacitor, the signal conditioning module also includes a third resistor and a fourth resistor respectively arranged on both sides of the first resistor, and a fifth resistor and a sixth resistor respectively arranged on both sides of the second resistor, the RF radio frequency filter also includes a first bias resistor and a second bias resistor respectively arranged on one side of the positive input end and the negative input end, the signal conditioning module also includes a fourth capacitor arranged between the fourth resistor and the first bias resistor, and a fifth capacitor arranged between the sixth resistor and the second bias resistor.

[0028] Specifically, in this embodiment, the above-mentioned R8 (first resistor), R10 (second resistor), C1 (first capacitor), C3 (third capacitor), and C5 (second capacitor) constitute an RF filter for filtering out radio frequency interference, and can filter out common mode and differential mode interference. The circuit form is an RC low-pass filter, and the passband cut-off frequency is generally more than 10 times higher than the signal bandwidth to avoid affecting the sensor signal. The RF radio frequency filter includes a common mode filter and a differential mode filter, wherein R8 and C1, R10 and C5 constitute a single-pole common mode filter, and the signal limiting bandwidth is fcm=1 / 2(πRCc), wherein Cc=C1=C5, and R=R8=R10; R8, R10, C1, C3, and C5 together constitute a differential mode signal filter, and the signal limiting bandwidth is fdm=1 / 2πR(2Cd+Cc), wherein Cd=C3. U1 is a programmable amplifier. It amplifies single-ended / differential, DC / AC coupled signals according to the type of signal input to U1. The amplification factor is realized by the microcontroller writing gain data through the IIC interface of PGA_A0 and PGA_A1. R5 (first bias resistor) and R13 (second bias resistor) provide input bias current loop for the programmable amplifier to ensure the static working point of U1. The main function of U1 is to perform primary signal processing. A programmable amplifier can be used to achieve dynamic gain configuration with multiple gears, or an instrument amplifier can be used with a digital potentiometer to achieve signal gain configuration.

[0029] A controller is provided on one side of the third resistor, the fourth resistor, the fourth capacitor and the fifth capacitor. Preferably, in this embodiment, the controller is one or more of a mechanical signal relay, an analog switch or an optical coupler relay, and the R and C devices are connected or disconnected through the logic control signal of the microcontroller.

[0030] also, Figure 1 In the figure, J1 is a terminal block for connecting the signal cable of the sensor. The 5th pin of J1 is connected to the shielding layer of the sensor cable and is grounded on the device side to improve the anti-interference ability. Pins 3 and 4 of J1 are used to connect the signal output line of the sensor. D1 and D2 are used for surge protection of the sensor signal line. Pins 1 and 2 of J1 are used to provide power to sensors that require a constant voltage power supply.

[0031] The signal conditioning module also includes a first measurement module and a second measurement module. The first measurement module is used to control the third resistor, the fifth resistor, the sixth resistor and the fourth capacitor to be connected, and control the fourth resistor and the fifth capacitor to be closed based on the controller, so as to realize the signal measurement of the IEPE sensor; the second measurement module is used to control the fourth resistor, the fifth resistor and the sixth resistor to be connected, and control the third resistor, the fourth capacitor and the fifth capacitor to be closed based on the controller, so as to realize the signal measurement of the voltage sensor.

[0032] Specifically, in this embodiment, the multi-dynamic signal conditioning device further includes a power supply module, the power supply module includes a power supply module disposed on one side of the wiring terminal, a constant current source module is disposed on one side of the power supply module, and an eighth resistor is disposed between the constant current source module and the power supply module. Furthermore, the power supply module further includes a constant voltage source module disposed on one side of the power supply module, and a ninth resistor is disposed between the constant voltage source module and the power supply module.

[0033] like Figure 2 The figure shows the circuit diagram of the constant voltage source module, which is mainly responsible for providing constant voltage power to sensors that require constant voltage power supply. The circuit uses a DC-DC boost converter to achieve a constant voltage output of 12 to 24V.

[0034] like Figure 3 The figure shows the circuit diagram of the constant current source module, which is mainly responsible for providing constant current excitation to the IEPE sensor. Generally, the excitation current range of the IEPE sensor is 2 to 10 mA. Figure 3 The value of VREF can be adjusted to achieve different current outputs.

[0035] The circuit implements the conditioning of different electrical signals by configuring different combinations of resistors and capacitors. The above-mentioned first measurement module corresponds to the data acquisition of the IEPE sensor. When the data signal of the IEPE sensor needs to be collected, the above-mentioned capacitors and resistors are configured by the controller, specifically by: using R7 (third resistor), C2 (fourth capacitor), R11 (sixth resistor), R12 (fifth resistor); not using: R6 (fourth resistor), R9 (seventh resistor), C4 (fifth capacitor); the remaining position number devices are all used. Preferably, in this embodiment, the above-mentioned measurement modules correspond to the signal acquisition of different types of sensors, and the connection or disconnection of R and C devices is realized through the preset logic control signal of the microcontroller. It can be understood that in other embodiments of the present application, it is also possible to prefabricate by reserving circuit resistor and capacitor discrete devices and distinguishing the use or non-use (welding or non-welding) of materials according to their functions. The corresponding measurement modules are produced in advance according to different measurement objects, but the circuits and PCBs are the same, and are only distinguished by BOM data.

[0036] For ease of understanding, the above-mentioned IEPE is a vibration sensor with its own charge amplifier, with a built-in integrated circuit, driven by the above-mentioned constant current source module. R7 (the third resistor) is used to connect the constant current source to VCC_EX through R56 (the eighth resistor) to provide it to the IEPE sensor, that is, the role of R7 (the third resistor) is to connect the circuit network point, and a 0 ohm resistor is actually used. Using C2 (the fourth capacitor) and not using R6 (the fourth resistor) is configured in AC coupling mode, the purpose is to eliminate the useless IEPE bias DC voltage. R11 (the sixth resistor) and R12 (the fifth resistor) use 0 ohms to configure the signal chain in single-ended mode. R9 (the seventh resistor) and C4 (the fifth capacitor) are not used in IEPE measurement mode.

[0037] Further, in this embodiment, the second measurement module corresponds to the data acquisition of the voltage sensor. When the data signal of the voltage sensor needs to be collected, the capacitor and resistor are configured by the controller, specifically by: using: R11 (sixth resistor), R6 (fourth resistor), R12 (fifth resistor); not using: R7 (third resistor), R9 (seventh resistor), C2 (fourth capacitor), C4 (fifth capacitor); the remaining position number devices are used. For voltage signals, the signal bandwidth generally starts from DC, so R11 (sixth resistor), R6 (fourth resistor), R12 (fifth resistor) are used, and all use 0 ohm resistors to configure the input to single-ended DC coupling mode; R7 (third resistor) is not used at this time, and there is no need to provide a constant current source for the sensor, but R54 (ninth resistor) is connected to VCC_EX to provide a constant voltage source; R9 (seventh resistor), C2 (fourth capacitor), C4 (fifth capacitor) are not used in the voltage measurement mode.

[0038] Preferably, in this embodiment, the signal conditioning module further includes a seventh resistor disposed between the first resistor and the second resistor, and a controller is disposed on one side of the seventh resistor. The signal conditioning module further includes a third measurement module, and the third measurement module is used to control the fourth resistor, the fifth resistor, the sixth resistor and the seventh resistor to be connected based on the controller, and to control the third resistor, the fourth capacitor and the fifth capacitor to be closed, so as to realize the signal measurement of the current sensor. R9 (seventh resistor) is the sampling resistor of the current sensor. Generally, the output range of the current sensor is 4 to 20 mA. The appropriate resistance value can be selected according to the voltage range to be converted. The resistor needs to select a low temperature drift resistor.

[0039] The above-mentioned third measurement module corresponds to the data acquisition of the current sensor. When the data signal of the current sensor needs to be collected, the above-mentioned capacitors and resistors are configured through the controller, specifically by: using: R12 (fifth resistor), R6 (fourth resistor), R9 (seventh resistor), R11 (sixth resistor); not using: R7 (third resistor), C2 (fourth capacitor), C4 (fifth capacitor); all other devices with other position numbers are used.

[0040] The current sensor signal is also a single-ended signal, so it needs to be configured in single-ended mode, using DC coupling, using R12 (fifth resistor), R6 (fourth resistor), and R11 (sixth resistor), and the values ​​of these three resistors are all 0 ohms; at the same time, the current signal needs to be converted into a voltage signal, and the current signal needs to flow through R9 (seventh resistor) to become a voltage signal. The size of R9 (seventh resistor) is determined according to the current / voltage conversion ratio; the power supply of the current sensor is generally a DC power supply, so R7 (third resistor) is not used, and VCC_EX is connected through R54 (ninth resistor) to provide a constant voltage power supply; C2 (fourth capacitor) and C4 (fifth capacitor) are not used in current mode.

[0041] Furthermore, in this embodiment, the signal conditioning module further includes a fourth measurement module, and the fourth measurement module is used to control the fourth resistor and the sixth resistor to be connected based on the controller, and control the third resistor, the fifth resistor, the seventh resistor, the fourth capacitor and the fifth capacitor to be closed, so as to achieve signal measurement of the bridge sensor. The power supply module further includes a bridge constant voltage source module, and a tenth resistor is provided between the bridge constant voltage source module and the power supply module.

[0042] The above-mentioned fourth measurement module corresponds to the data acquisition of the bridge sensor. When the data signal of the bridge sensor needs to be collected, the above-mentioned capacitors and resistors are configured through the controller, specifically by: using: R11 (sixth resistor), R6 (fourth resistor); not using: R7 (third resistor), R12 (fifth resistor), R9 (seventh resistor), C2 (fourth capacitor), C4 (fifth capacitor); all other devices with other position numbers are used.

[0043] The bridge sensor is a differential signal and uses DC coupling, so R11 (sixth resistor) and R6 (fourth resistor) are used; the power supply of the bridge sensor is generally a specific constant voltage source, so R55 (tenth resistor) is connected to VCC_EX to provide constant voltage bridge excitation; R7 (third resistor), R12 (fifth resistor), R9 (seventh resistor), C2 (fourth capacitor), and C4 (fifth capacitor) are not used in bridge mode.

[0044] like Figure 4The figure shows the circuit diagram of the bridge constant voltage source module, which is mainly responsible for providing constant voltage excitation for the dynamic strain bridge sensor. Since the bridge voltages of sensors from different manufacturers are different, the bridge constant voltage circuit needs to be able to adjust the output voltage. By adjusting the size of the adjustable resistor R49, different bridge voltage outputs can be achieved. Figure 1 In the figure, R54 (the ninth resistor), R55 (the tenth resistor), and R56 (the eighth resistor) are responsible for connecting different power supplies to VCC_EX to power different sensors. In practice, these three resistors can also realize automatic switching connection functions through electronic switches, relays, etc., but it should be noted that switching between different power supplies requires delay to avoid power supply conflicts.

[0045] In summary, the multi-dynamic signal conditioning device in the above-mentioned embodiment of the utility model, by designing the signal conditioning module circuit and based on each measurement module, realizes that the same collector can simultaneously measure different types of electrical signal vibration sensors, thereby reducing the requirements on the type of collector in the dynamic monitoring application scenario.

[0046] A second embodiment of the present application provides a data acquisition instrument, including the multi-dynamic signal conditioning device in the above embodiment.

[0047] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0048] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model shall be subject to the attached claims.

Claims

1. A multi-dynamic signal conditioning device, It is characterized in that The invention comprises a wiring terminal for receiving a sensor signal, a programmable amplifier arranged at one side of an output end of the wiring terminal, and a signal conditioning module arranged between the programmable amplifier and the wiring terminal, wherein the signal conditioning module comprises an RF radio frequency filter, wherein the RF radio frequency filter comprises a first capacitor and a first resistor arranged at one side of a positive input end of the programmable amplifier, a second capacitor and a second resistor arranged at one side of a negative input end of the programmable amplifier, and a third capacitor arranged between the first capacitor and the second capacitor, wherein the signal conditioning module further comprises a third resistor and a fourth resistor respectively arranged at both sides of the first resistor, and a fifth resistor and a sixth resistor respectively arranged at both sides of the second resistor, wherein the RF radio frequency filter further comprises a first bias resistor and a second bias resistor respectively arranged at one side of the positive input end and the negative input end, wherein the signal conditioning module further comprises a fourth capacitor arranged between the fourth resistor and the first bias resistor, and a fifth capacitor arranged between the sixth resistor and the second bias resistor; A controller is provided on one side of the third resistor, the fourth resistor, the fourth capacitor and the fifth capacitor; The signal conditioning module also includes a first measurement module and a second measurement module. The first measurement module is used to control the third resistor, the fifth resistor, the sixth resistor and the fourth capacitor to be connected, and control the fourth resistor and the fifth capacitor to be closed based on the controller, so as to realize the signal measurement of the IEPE sensor; the second measurement module is used to control the fourth resistor, the fifth resistor and the sixth resistor to be connected, and control the third resistor, the fourth capacitor and the fifth capacitor to be closed based on the controller, so as to realize the signal measurement of the voltage sensor.

2. The multi-dynamic signal conditioning device according to claim 1, It is characterized in that The signal conditioning module further includes a seventh resistor disposed between the first resistor and the second resistor, and a controller is disposed on one side of the seventh resistor.

3. The multi-dynamic signal conditioning device according to claim 2, It is characterized in that The signal conditioning module also includes a third measurement module, which is used to control the fourth resistor, the fifth resistor, the sixth resistor and the seventh resistor to be connected, and control the third resistor, the fourth capacitor and the fifth capacitor to be closed based on the controller, so as to realize signal measurement of the current sensor.

4. The multi-dynamic signal conditioning device according to claim 2, It is characterized in that The signal conditioning module also includes a fourth measurement module, which is used to control the fourth resistor and the sixth resistor to be connected, and control the third resistor, the fifth resistor, the seventh resistor, the fourth capacitor and the fifth capacitor to be closed based on the controller, so as to realize signal measurement of the bridge sensor.

5. The multi-dynamic signal conditioning device according to claim 1, It is characterized in that The controller is one or more of a signal relay, an analog switch or an optical coupler relay.

6. The multi-dynamic signal conditioning device according to claim 1, It is characterized in that The multi-dynamic signal conditioning device also includes a power supply module, which includes a power supply module arranged on one side of the wiring terminal, a constant current source module is provided on one side of the power supply module, and an eighth resistor is provided between the constant current source module and the power supply module.

7. The multi-dynamic signal conditioning device according to claim 6, It is characterized in that The power supply module further includes a constant voltage source module disposed at one side of the power supply module, and a ninth resistor is disposed between the constant voltage source module and the power supply module.

8. The multi-dynamic signal conditioning device according to claim 7, It is characterized in that The power supply module further comprises a bridge constant voltage source module, and a tenth resistor is arranged between the bridge constant voltage source module and the power supply module.

9. A data acquisition device, It is characterized in that A multi-dynamic signal conditioning device comprising any one of claims 1-8.

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