Analog quantity acquisition device and system

Abstract

The application provides an analog quantity acquisition device and system, which comprises a signal protection and conditioning module, an analog-digital converter, a controller and a first power module; the first power module comprises a direct current-direct current converter and a charge pump. The direct current-direct current converter is connected with the first power source, converts the first power source into a first voltage, and provides the first voltage for the charge pump and the signal protection and conditioning module; the charge pump converts the first voltage into a second voltage and provides the second voltage for the signal protection and conditioning module; the signal protection and conditioning module processes an initial analog quantity signal and outputs a target analog quantity signal; and the analog-digital conversion module converts the target analog quantity signal into a digital signal and transmits the digital signal to the controller. According to the technical scheme, the signal protection and conditioning module is used to perform signal conditioning on the collected analog quantity signal, the collection precision is improved, the direct current-direct current converter and the charge pump are used to convert the power source, the power conversion efficiency is improved, and thus the power consumption is reduced.

Description

Technical Field

[0001] This application relates to the field of analog signal acquisition technology, and in particular to analog signal acquisition devices and systems. Background Technology

[0002] Analog signal acquisition is one of the core foundational functions in industrial automation and the Internet of Things, providing a basis for technical analysis and process control. This process acts as a bridge between the physical and digital worlds and is a prerequisite for achieving intelligence and automation.

[0003] Currently, most analog signal acquisition devices consume a lot of power in order to ensure acquisition accuracy. Therefore, how to reduce power consumption while ensuring the acquisition accuracy of analog signal acquisition devices is a technical problem that urgently needs to be solved in this field. Utility Model Content

[0004] Based on the above requirements, this application proposes an analog signal acquisition device and system that can reduce power consumption while ensuring the acquisition accuracy of the analog signal acquisition device.

[0005] To achieve the above objectives, this application proposes the following technical solution: According to a first aspect of the embodiments of this application, an analog signal acquisition device is provided, including: a signal protection and conditioning module, an analog-to-digital converter, a controller, and a first power supply module; The first power module includes: a DC-DC converter and a charge pump; The signal protection and conditioning module is connected to the analog-to-digital converter; The analog-to-digital converter is connected to the controller; The DC-DC converter is connected to the charge pump; The DC-DC converter and the charge pump are respectively connected to the signal protection and conditioning module; The DC-DC converter is connected to a first power source, converts the first power source into a first voltage, and provides the first voltage to the charge pump and the signal protection and conditioning module. The charge pump receives the first voltage, converts the first voltage into a second voltage, and provides the second voltage to the signal protection and conditioning module. The signal protection and conditioning module is used to receive the initial analog signal, process the initial analog signal, and output the target analog signal. The analog-to-digital converter is used to convert the target analog signal into a digital signal and transmit the digital signal to the controller.

[0006] Optionally, the DC-DC converter includes: an isolated DC / DC converter and a non-isolated DC / DC converter; The input terminal of the isolated DC / DC is connected to the first power supply, and the output terminal of the isolated DC / DC is connected to the input terminal of the charge pump, the input terminal of the non-isolated DC / DC, and the signal protection and conditioning module, respectively. The output terminal of the charge pump is connected to the signal protection and conditioning module; The output of the non-isolated DC / DC converter is connected to the analog-to-digital converter. The isolated DC / DC receives a first power source, converts the first power source into a first voltage, and provides the first voltage to the charge pump, the non-isolated DC / DC, and the signal protection and conditioning module; The non-isolated DC / DC converter converts the first voltage into a third voltage and provides the third voltage to the analog-to-digital converter.

[0007] Optionally, the signal protection and conditioning module includes: a transient voltage suppressor, an active low-pass filter, and an anti-aliasing filter; The transient voltage suppressor and the anti-aliasing filter are respectively connected to the active low-pass filter; The anti-aliasing filter is connected to the analog-to-digital converter; The active low-pass filter is used to receive the first voltage and the second voltage; The transient voltage suppressor is used to receive the initial analog signal. After the initial analog signal is processed by the transient voltage suppressor, the active low-pass filter and the anti-aliasing filter, the anti-aliasing filter outputs the target analog signal.

[0008] Optionally, the analog signal acquisition device may also include: an isolation module; The analog-to-digital converter is connected to the controller via the isolation module.

[0009] Optionally, the analog signal acquisition device may also include: a second power supply module; The input terminal of the second power module is connected to the second power source, and the output terminal of the second power module is connected to the controller. The second power module is used to provide a fourth voltage to the controller.

[0010] Optionally, the analog acquisition device may also include: an error calibration module; The error calibration module is connected to the analog-to-digital converter; The error calibration module is used to determine the error calibration coefficient based on the input voltage and the voltage collected by the analog-to-digital converter, and to perform error calibration on the bias voltage error between the signal protection and conditioning module and the analog-to-digital converter according to the error calibration coefficient.

[0011] Optionally, the analog-to-digital converter is a successive approximation register-type analog-to-digital converter.

[0012] Optionally, both the analog-to-digital converter and the controller are connected to the isolation module via an SPI interface.

[0013] Optionally, the first voltage and the second voltage provide a bipolar power supply for the signal protection and conditioning module, wherein the first power supply is 24V, the first voltage is +15V, and the second voltage is -15V.

[0014] According to a second aspect of the embodiments of this application, an analog signal acquisition system is provided, including: a first power supply, a host computer, and the analog signal acquisition device described above; The first power supply is connected to the first power module in the analog quantity acquisition device; The host computer is connected to the controller in the analog quantity acquisition device.

[0015] The analog signal acquisition device proposed in this application includes: a signal protection and conditioning module, an analog-to-digital converter (ADC), a controller, and a first power supply module. The first power supply module includes: a DC-DC converter and a charge pump. The signal protection and conditioning module is connected to the ADC. The ADC is connected to the controller. The DC-DC converter is connected to the charge pump. The DC-DC converter and the charge pump are respectively connected to the signal protection and conditioning module. The DC-DC converter is connected to the first power supply, converts the first power supply into a first voltage, and provides the first voltage to the charge pump and the signal protection and conditioning module. The charge pump receives the first voltage, converts it into a second voltage, and provides the second voltage to the signal protection and conditioning module. The signal protection and conditioning module receives an initial analog signal, processes the initial analog signal, and outputs a target analog signal. The ADC is used to convert the target analog signal into a digital signal and transmit the digital signal to the controller. Using the technical solution of this application, the acquired analog signal can be conditioned by the signal protection and conditioning module, improving the acquisition accuracy. Furthermore, using a DC-DC converter and a charge pump to convert the power supply improves the power conversion efficiency, thereby reducing power consumption. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1This is a schematic diagram of an analog signal acquisition device provided in an embodiment of this application.

[0018] Figure 2 This is a schematic diagram of another analog signal acquisition device provided in an embodiment of this application.

[0019] Figure 3 This is a schematic diagram of the signal protection and conditioning module provided in an embodiment of this application.

[0020] Figure 4 This is a schematic diagram of another analog signal acquisition device provided in an embodiment of this application.

[0021] Figure 5 This is a schematic diagram of another analog signal acquisition device provided in an embodiment of this application.

[0022] Figure 6 This is a schematic diagram of an analog signal acquisition system provided in an embodiment of this application.

[0023] Figure 7 This is a schematic diagram of another analog signal acquisition system provided in an embodiment of this application. Detailed Implementation

[0024] The technical solutions of this application are applicable to analog signal acquisition scenarios. By employing the technical solutions of this application, power conversion efficiency can be improved, thereby reducing power consumption.

[0025] Analog signal acquisition, simply put, is the process of accurately measuring and digitally converting continuously changing physical quantities such as temperature, pressure, flow rate, voltage, and current. These physical quantities are widely present in various aspects of industrial production and Internet of Things (IoT) applications. Analog signal acquisition is one of the core foundational functions in industrial automation and the IoT, providing a basis for technical analysis and process control. This process acts as a bridge between the physical and digital worlds and is a prerequisite for achieving intelligent and automated operations.

[0026] Currently, most analog signal acquisition devices consume a lot of power in order to ensure acquisition accuracy. Therefore, how to reduce power consumption while ensuring the acquisition accuracy of analog signal acquisition devices is a technical problem that urgently needs to be solved in this field.

[0027] Based on this, this application proposes a method that can perform signal conditioning on the acquired analog signal through a signal protection and conditioning module to improve the acquisition accuracy. Furthermore, by using a DC-DC converter and a charge pump to convert the power supply, the power conversion efficiency can be improved and the power consumption reduced, thereby solving the problem of high power consumption in the prior art while ensuring the acquisition accuracy of the analog signal acquisition device.

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] Exemplary device See Figure 1 As shown in the figure, this application proposes an analog signal acquisition device. The device includes: a signal protection and conditioning module 101, an analog-to-digital converter 102, a controller 103, and a first power supply module 104. The first power supply module 104 includes: a DC-DC converter 1041 and a charge pump 1042. The signal protection and conditioning module 101 is connected to the analog-to-digital converter 102, the analog-to-digital converter 102 is connected to the controller 103, the DC-DC converter 1041 is connected to the charge pump 1042, and both the DC-DC converter 1041 and the charge pump 1042 are connected to the signal protection and conditioning module 101.

[0030] Specifically, the DC-DC converter 1041 is connected to the first power supply 201, converting the first power supply 201 into a first voltage, which is then supplied to the charge pump 1042 and the signal protection and conditioning module 101. Upon receiving the first voltage, the charge pump 1042 converts it into a second voltage and supplies this second voltage to the signal protection and conditioning module 101. The signal protection and conditioning module 101 receives both the first and second voltages, thus providing power to itself.

[0031] The input terminal of the signal protection and conditioning module 101 is connected to the signal input terminal, enabling it to receive the initial analog signal transmitted from the signal input terminal. The signal protection and conditioning module 101 protects and conditions the initial analog signal to obtain the conditioned target analog signal. The output terminal of the signal protection and conditioning module 101 is connected to the input terminal of the analog-to-digital converter 102. The signal protection and conditioning module 101 transmits the target analog signal to the analog-to-digital converter 102 through its output terminal. The input terminal of the analog-to-digital converter 102 receives the target analog signal, converts the target analog signal into a digital signal, and transmits the digital signal to the controller 103 through its output terminal, so that the controller 103 can analyze and process the acquired digital signal.

[0032] As can be seen from the above description, the analog signal acquisition device proposed in this application embodiment can improve the accuracy of analog signals by using the signal protection and conditioning module 101. Furthermore, by using the DC-DC converter 1041 and the charge pump 1042 to convert the power supply, the power conversion efficiency can be improved, thereby reducing power consumption. Thus, power consumption is reduced while ensuring the acquisition accuracy of the analog signal acquisition device.

[0033] Furthermore, the analog-to-digital converter 102 preferably employs a successive approximation register-type analog-to-digital converter, i.e., a SAR-type ADC, for example, a 16-bit SAR-type ADC with a maximum speed of 500 ksps. Successive approximation register-type analog-to-digital converters have the advantages of high precision and high speed, which can improve the accuracy and speed of analog signal acquisition devices.

[0034] Furthermore, in this embodiment, the first power supply is preferably 24V. The DC-DC converter 1041 can convert the 24V first power supply to a +15V first voltage, and the charge pump 1042 can convert the +15V first voltage to a -15V second voltage. The first voltage and the second voltage can provide bipolar power to the signal protection and conditioning module 101, thereby powering the signal protection and conditioning module 101. Since the input signal of the signal protection and conditioning module 101 is bipolar, if only a unipolar +15V power supply is used to power the signal protection and conditioning module 101, then the negative polarity signal in the input signal will not be able to pass through the signal protection and conditioning module 101. Therefore, this embodiment needs to convert the 24V power supply to a +15V first voltage and a -15V second voltage. Furthermore, existing traditional solutions use DC-DC converters to directly output ±15V voltage. When the load current is low, such as 30mA, the power conversion efficiency of this solution is only 50%. However, using a DC-DC converter to output a single +15V voltage can achieve an efficiency of 80%. Then, the +15V voltage is converted to -15V voltage through a charge pump, and the efficiency of this process can also reach 80%. According to calculations, the overall efficiency of the -15V voltage can reach 80%*80%=60%, which is a 10% improvement in power conversion efficiency. With the improvement in power conversion efficiency, the power consumption of the power module naturally decreases, thereby reducing the power consumption of the analog signal acquisition device.

[0035] As an optional implementation, see [link to implementation details]. Figure 2As shown in another embodiment of this application, a DC-DC converter 1041 includes an isolated DC / DC converter 10411 and a non-isolated DC / DC converter 10412. The input terminal of the isolated DC / DC converter 10411 is connected to a first power supply 201. The output terminal of the isolated DC / DC converter 10411 is connected to the input terminal of a charge pump 1042, the input terminal of the non-isolated DC / DC converter 10412, and a signal protection and conditioning module 101. The output terminal of the charge pump 1042 is also connected to the signal protection and conditioning module 101. The output terminal of the non-isolated DC / DC converter 10412 is connected to an analog-to-digital converter 102.

[0036] Specifically, the input of the isolated DC / DC 10411 receives a first power supply, converts the first power supply into a first voltage, and then provides the first voltage to the charge pump 1042, the non-isolated DC / DC 10412, and the signal protection and conditioning module 101 through the output of the isolated DC / DC 10411. After receiving the first voltage at its input, the non-isolated DC / DC 10412 converts the first voltage into a third voltage, and provides the third voltage to the analog-to-digital converter 102 through its output, thereby powering the analog-to-digital converter 102.

[0037] Furthermore, when the first power supply is 24V and the first voltage is +15V, the non-isolated DC / DC10412 converts the +15V voltage into a third voltage of +5V, and uses this +5V third voltage to power the analog-to-digital converter 102.

[0038] In this embodiment, the isolated DC / DC10411 and the non-isolated DC / DC10412 preferably use lightweight and high-efficiency chips.

[0039] As an optional implementation, see [link to implementation details]. Figure 3 As shown in another embodiment of this application, the signal protection and conditioning module 101 includes: a transient voltage suppressor (TVS) 1011, an active low-pass filter 1012, and an anti-aliasing filter 1013. The transient voltage suppressor 1011 and the anti-aliasing filter 1013 are respectively connected to the active low-pass filter 1012, and the anti-aliasing filter 1013 is connected to the analog-to-digital converter 102.

[0040] Specifically, the input terminal of the transient voltage suppressor 1011 is connected to the signal input terminal, enabling it to receive the initial analog signal transmitted from the signal input terminal. The output terminal of the transient voltage suppressor 1011 is connected to the input terminal of the active low-pass filter 1012. The output terminal of the active low-pass filter 1012 is connected to the input terminal of the anti-aliasing filter 1013. The output terminal of the anti-aliasing filter 1013 is connected to the input terminal of the analog-to-digital converter 102. After the initial analog signal is processed by the transient voltage suppressor 1011, the active low-pass filter 1012, and the anti-aliasing filter 1013, the target analog signal is obtained. The output terminal of the anti-aliasing filter 1013 transmits the target analog signal to the analog-to-digital converter 102. The input terminal of the analog-to-digital converter 102 receives the target analog signal, enabling the analog-to-digital converter 102 to convert the target analog signal into a digital signal.

[0041] In this embodiment, the first voltage and the second voltage output by the first power supply module 104 (i.e., the first voltage output by the isolated DC / DC 10411 and the second voltage output by the charge pump 1042) are both transmitted to the active low-pass filter 1012 to power the operational amplifier in the active low-pass filter 1012. Preferably, the operational amplifier in the active low-pass filter 1012 is a chip with low quiescent current characteristics, such as TI's OPA2196. Using a chip with low quiescent current characteristics in the operational amplifier of the active low-pass filter 1012 can reduce the power consumption of the first power supply module 104, thereby reducing the power consumption of the analog signal acquisition device.

[0042] As an optional implementation, see [link to implementation details]. Figure 4 As shown in another embodiment of this application, the analog signal acquisition device further includes an isolation module 105. The analog-to-digital converter 102 is connected to the controller 103 via the isolation module 105.

[0043] In this embodiment, the signal protection and conditioning module 101, the analog-to-digital converter 102, and the first power supply module 104 are the field side of the analog signal acquisition device, while the controller 103 is the system side of the analog signal acquisition device. The field side is the field analog signal processing terminal, used for protecting and conditioning analog signals, ultimately converting them into digital signals. The system side is used to control the behavior of the field-side modules and acquire the converted digital signals from the field side. The isolation module 105 isolates the field side from the system side, reducing mutual interference between digital and analog signals and improving the anti-interference capability of the analog signal acquisition device.

[0044] Furthermore, both the analog-to-digital converter 102 and the controller 103 are connected to the isolation module 105 via an SPI interface.

[0045] As an optional implementation, see [link to implementation details]. Figure 5As shown in another embodiment of this application, the analog signal acquisition device further includes a second power supply module 106. The input terminal of the second power supply module 106 is connected to the second power supply 202, and the output terminal of the second power supply module 106 is connected to the controller 103.

[0046] Specifically, the input terminal of the second power supply module 106 receives the second power supply 202, the second power supply module 106 converts the second power supply 202 into a fourth voltage, and provides the fourth voltage to the controller 103 through the output terminal of the second power supply module 106, thereby powering the controller 103. Preferably, the second power supply is +5V, and the fourth voltage is preferably +3.3V.

[0047] As an optional implementation, another embodiment of this application discloses that the analog signal acquisition device further includes an error calibration module. The error calibration module is connected to the analog-to-digital converter 102.

[0048] Specifically, the error calibration module can determine the error calibration coefficient based on the input voltage and the voltage collected by the analog-to-digital converter 102, and perform error calibration on the bias voltage error between the signal protection and conditioning module 101 and the analog-to-digital converter 102 according to the error calibration coefficient. The input voltage is preferably a voltage at 20% and 80% of the range. The input signals corresponding to the two input voltages are respectively input to the signal protection and conditioning module 101. Then, the actual voltages corresponding to the two input signals collected by the analog-to-digital converter 102 are obtained. These two sets of data are then substituted into a pre-set error calibration formula (i.e., y=kx+b, where y represents the input voltage, x represents the actual voltage, and k and b are the error calibration coefficients) to calculate the error calibration coefficient. For example, if the full scale is -10V to 10V, then 20% refers to -8V, and 80% refers to 8V. That is, the input signal is given to -8V and 8V respectively, and the actual voltage collected by the analog-to-digital converter 102 is obtained. For example, if the input signal is given to -8V, the actual voltage collected by the analog-to-digital converter 102 is -7.98V; if the input signal is given to 8V, the actual voltage collected by the analog-to-digital converter 102 is 8.02V. Substituting the two sets of data into the formula y=kx+b, k and b are calculated.

[0049] Exemplary System Optionally, see Figure 6As shown in the illustration, this application also provides an analog signal acquisition system, which includes an analog signal acquisition device 10, a first power supply 201, and a host computer 30. The first power supply 201 is connected to the first power module 104 in the analog signal acquisition device 10, and the host computer 30 is connected to the controller in the analog signal acquisition device 10. The first power supply 201 supplies power to the signal protection and conditioning module and the analog-to-digital converter in the analog signal acquisition device 10 through the first power module 104. The host computer 30 is connected to the controller through a serial port and can configure parameters for each module in the analog signal acquisition device and issue control commands through the controller. The analog signal acquisition device 10 is the analog signal acquisition device in the above embodiment.

[0050] As can be seen from the above description, the analog signal acquisition system proposed in this application has a signal protection and conditioning module in the analog signal acquisition device that can improve the accuracy of the analog signal. Furthermore, the analog signal acquisition device uses a DC-DC converter and a charge pump to convert the first power supply, which can improve the power conversion efficiency and reduce power consumption. Thus, it achieves the goal of reducing power consumption while ensuring the acquisition accuracy of the analog signal acquisition device.

[0051] As an optional implementation, see [link to implementation details]. Figure 7 As shown in another embodiment of this application, the analog signal acquisition system further includes a second power supply 202. The second power supply 202 is connected to the second power module in the analog signal acquisition device 10, and the second power supply 202 supplies power to the controller in the analog signal acquisition device 10 through the second power module.

[0052] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The modules and sub-modules in the devices and terminals in the various embodiments of this application can be merged, divided, and deleted according to actual needs.

[0053] It should be understood that the disclosed terminals, devices, and methods can be implemented in other ways, given the several embodiments provided in this application. For example, the terminal embodiments described above are merely illustrative. For instance, the division of modules or sub-modules is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple sub-modules or modules may be combined or integrated into another module, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices, or modules, and may be electrical, mechanical, or other forms.

[0054] The modules or submodules described as separate components may or may not be physically separate. The components that constitute a module or submodule may or may not be physical modules or submodules; that is, they may be located in one place or distributed across multiple network modules or submodules. Some or all of the modules or submodules can be selected to achieve the purpose of this embodiment's solution, depending on actual needs.

[0055] Furthermore, the functional modules or sub-modules in the various embodiments of this application can be integrated into one processing module, or each module or sub-module can exist physically separately, or two or more modules or sub-modules can be integrated into one module. The integrated modules or sub-modules described above can be implemented in hardware or in the form of software functional modules or sub-modules.

[0056] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, 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 limitations, 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.

[0057] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An analog signal acquisition device, characterized in that, include: Signal protection and conditioning module, analog-to-digital converter, controller and first power supply module; The first power module includes: a DC-DC converter and a charge pump; The signal protection and conditioning module is connected to the analog-to-digital converter; The analog-to-digital converter is connected to the controller; The DC-DC converter is connected to the charge pump; The DC-DC converter and the charge pump are respectively connected to the signal protection and conditioning module; The DC-DC converter is connected to a first power source, converts the first power source into a first voltage, and provides the first voltage to the charge pump and the signal protection and conditioning module. The charge pump receives the first voltage, converts the first voltage into a second voltage, and provides the second voltage to the signal protection and conditioning module. The signal protection and conditioning module is used to receive the initial analog signal, process the initial analog signal, and output the target analog signal. The analog-to-digital converter is used to convert the target analog signal into a digital signal and transmit the digital signal to the controller.

2. The analog signal acquisition device according to claim 1, characterized in that, The DC-DC converter includes: an isolated DC / DC converter and a non-isolated DC / DC converter; The input terminal of the isolated DC / DC is connected to the first power supply, and the output terminal of the isolated DC / DC is connected to the input terminal of the charge pump, the input terminal of the non-isolated DC / DC, and the signal protection and conditioning module, respectively. The output terminal of the charge pump is connected to the signal protection and conditioning module; The output of the non-isolated DC / DC converter is connected to the analog-to-digital converter. The isolated DC / DC receives a first power source, converts the first power source into a first voltage, and provides the first voltage to the charge pump, the non-isolated DC / DC, and the signal protection and conditioning module; The non-isolated DC / DC converter converts the first voltage into a third voltage and provides the third voltage to the analog-to-digital converter.

3. The analog signal acquisition device according to claim 1, characterized in that, The signal protection and conditioning module includes: a transient voltage suppressor, an active low-pass filter, and an anti-aliasing filter; The transient voltage suppressor and the anti-aliasing filter are respectively connected to the active low-pass filter; The anti-aliasing filter is connected to the analog-to-digital converter; The active low-pass filter is used to receive the first voltage and the second voltage; The transient voltage suppressor is used to receive the initial analog signal. After the initial analog signal is processed by the transient voltage suppressor, the active low-pass filter and the anti-aliasing filter, the anti-aliasing filter outputs the target analog signal.

4. The analog signal acquisition device according to claim 1, characterized in that, Also includes: Isolation module; The analog-to-digital converter is connected to the controller via the isolation module.

5. The analog signal acquisition device according to claim 1, characterized in that, Also includes: Second power supply module; The input terminal of the second power module is connected to the second power source, and the output terminal of the second power module is connected to the controller. The second power module is used to provide a fourth voltage to the controller.

6. The analog signal acquisition device according to claim 1, characterized in that, It also includes: an error calibration module; The error calibration module is connected to the analog-to-digital converter; The error calibration module is used to determine the error calibration coefficient based on the input voltage and the voltage collected by the analog-to-digital converter, and to perform error calibration on the bias voltage error between the signal protection and conditioning module and the analog-to-digital converter according to the error calibration coefficient.

7. The analog signal acquisition device according to claim 1, characterized in that, The analog-to-digital converter is a successive approximation register-type analog-to-digital converter.

8. The analog signal acquisition device according to claim 4, characterized in that, Both the analog-to-digital converter and the controller are connected to the isolation module via an SPI interface.

9. The analog signal acquisition device according to claim 1, characterized in that, The first voltage and the second voltage provide bipolar power to the signal protection and conditioning module. The first power is 24V, the first voltage is +15V, and the second voltage is -15V.

10. An analog signal acquisition system, characterized in that, include: The first power supply, the host computer, and the analog quantity acquisition device as described in any one of claims 1-9; The first power supply is connected to the first power module in the analog quantity acquisition device; The host computer is connected to the controller in the analog quantity acquisition device.

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