CN220085273U - High-precision data acquisition device - Google Patents
High-precision data acquisition device Download PDFInfo
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- CN220085273U CN220085273U CN202321589441.0U CN202321589441U CN220085273U CN 220085273 U CN220085273 U CN 220085273U CN 202321589441 U CN202321589441 U CN 202321589441U CN 220085273 U CN220085273 U CN 220085273U
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- 238000001914 filtration Methods 0.000 description 3
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- 238000004458 analytical method Methods 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
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- 238000003199 nucleic acid amplification method Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The utility model relates to the field of industrial data acquisition, in particular to a high-precision data acquisition device. The device comprises a main control module and an acquisition module. The acquisition module comprises an MCU, an AD converter and an acquisition unit, and the acquisition unit comprises an acquisition circuit and an amplifying circuit. The input end of the acquisition circuit inputs an analog signal to be acquired, the output end of the acquisition circuit is connected with the amplifying circuit in an adaptive manner, the amplifying circuit is connected with the AD converter in an adaptive manner, the AD converter is connected with the MCU in an adaptive manner, and the MCU is connected with the main control module in an adaptive manner. The AD converter is characterized by being a unipolar AD converter. The amplifying circuit comprises a differential amplifier, the output end of the differential amplifier is connected with the AD converter in an adapting way, the non-inverting input end of the differential amplifier is connected with one end of a resistor R6, and the other end of the resistor R6 is connected with a bias voltage VREF. The data acquisition device has higher precision.
Description
Technical Field
The utility model relates to the field of industrial data acquisition, in particular to a high-precision data acquisition device.
Background
The data acquisition is to automatically acquire signals through a data acquisition device, and transmit the signals to an upper computer for analysis and processing of voltage signals or voltage signals corresponding to other signals (such as the temperature is corresponding to voltage by a thermocouple).
Currently, a conventional data acquisition device generally includes a main control module and an acquisition module. The acquisition module comprises an MCU, an AD converter and an acquisition unit, and the acquisition unit comprises an acquisition circuit and an amplifying circuit. The input end of the acquisition circuit inputs an analog signal to be acquired, the output end of the acquisition circuit is connected with the amplifying circuit in an adaptive manner, the amplifying circuit is connected with the AD converter in an adaptive manner, the AD converter is connected with the MCU in an adaptive manner, and the MCU is connected with the main control module in an adaptive manner. When the system works, the acquisition unit acquires analog signals and sends the analog signals to the amplifying circuit, the amplifying circuit amplifies the analog signals and sends the amplified analog signals to the AD converter, the AD converter converts the analog signals into digital signals, the MCU reads the digital signals and transmits the digital signals to the main control module, and the main control module transmits the obtained digital signals to the upper computer. The common input signals comprise positive voltage signals and negative voltage signals, and bipolar AD is needed for the negative voltage signals if AD sampling is needed, but the bipolar price of the high-precision ADC is higher, so that the price of the whole equipment is also higher. Some manufacturers only collect positive voltage signals to reduce the cost, and the whole performance of the equipment is affected although the requirements can be met in certain occasions.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a high-precision data acquisition device which is higher in precision and lower in cost.
In order to solve the problems, the following technical scheme is provided:
the high-precision data acquisition device comprises a main control module and an acquisition module. The acquisition module comprises an MCU, an AD converter and an acquisition unit, and the acquisition unit comprises an acquisition circuit and an amplifying circuit. The input end of the acquisition circuit inputs an analog signal to be acquired, the output end of the acquisition circuit is connected with the amplifying circuit in an adaptive manner, the amplifying circuit is connected with the AD converter in an adaptive manner, the AD converter is connected with the MCU in an adaptive manner, and the MCU is connected with the main control module in an adaptive manner. The AD converter is characterized by being a unipolar AD converter. The amplifying circuit comprises a differential amplifier, an output end V+ of the collecting circuit is connected with one end of a resistor R4, the other end of the resistor R4 is connected with an inverting input end of the differential amplifier, an output end V-of the collecting circuit is connected with one end of a resistor R5, the other end of the resistor R5 is connected with an in-phase input end of the differential amplifier, the in-phase input end of the differential amplifier is connected with one end of a resistor R6, the other end of the resistor R6 is connected with a bias voltage VREF, the output end of the differential amplifier is connected with one end of a resistor R7, the other end of the resistor R7 is connected with the inverting input end of the differential amplifier, and the output end of the differential amplifier is connected with an AD converter in an adaptive manner.
By adopting the scheme, the bias voltage VREF is utilized to raise the input voltage, when the input voltage is negative voltage, the positive voltage can be obtained at the output end, the unipolar AD converter is convenient to sample, and the cost of the whole device is reduced.
And an isolation optocoupler is arranged between the output end of the differential amplifier and the AD converter.
By adopting the scheme, the isolation optocoupler is used for realizing the electrical isolation of the acquisition end and the processing end, reducing the electrical interference between the acquisition end and the processing end, realizing the electrical isolation between channels, and further improving the accuracy and the reliability of the acquired data.
The number of the acquisition units is not less than two, isolation optocouplers are arranged between the acquisition units and the AD converter, and the number of the acquisition units is 16.
By adopting the scheme, a plurality of acquisition units can be arranged according to the needs, so that the later use is convenient.
The acquisition circuit comprises a voltage dividing circuit and a filter circuit, wherein the input end of the voltage dividing circuit inputs an analog signal to be acquired, the output end of the voltage dividing circuit is connected with the input end of the filter circuit, and the output end of the filter circuit is the output end V+ and the output end V-of the acquisition circuit.
By adopting the scheme, the acquired signals can be divided to the required level by utilizing the voltage dividing circuit, (the input range of equipment can be conveniently and flexibly changed, the application range of the equipment is enlarged), and the acquired signals can be filtered by utilizing the filtering circuit, so that the stability of the acquired signals is ensured.
The number of the acquisition modules is not less than two.
And a CanFD bus is arranged between the MCU and the host module.
By adopting the scheme, the effective data of each frame of the CanFD message is 64 bytes, the effective data of the CanFD message accounts for over 70 percent of the whole frame of the message information, and the highest data transmission rate reaches 5Mbit/s, thereby better meeting the application requiring high real-time and high data transmission rate.
By adopting the scheme, the method has the following advantages:
because the AD converter of the high-precision data acquisition device is a unipolar AD converter; the amplifying circuit comprises a differential amplifier, an output end V+ of the collecting circuit is connected with one end of a resistor R4, the other end of the resistor R4 is connected with an inverting input end of the differential amplifier, an output end V-of the collecting circuit is connected with one end of a resistor R5, the other end of the resistor R5 is connected with an in-phase input end of the differential amplifier, the in-phase input end of the differential amplifier is connected with one end of a resistor R6, the other end of the resistor R6 is connected with a bias voltage VREF, the output end of the differential amplifier is connected with one end of a resistor R7, the other end of the resistor R7 is connected with the inverting input end of the differential amplifier, and the output end of the differential amplifier is connected with an AD converter in an adaptive manner. When the differential amplifier works, bias voltage VREF is added to the homodromous input end of the differential amplifier, so that the input voltage is lifted, when the input voltage is negative voltage, positive voltage can be obtained at the output end, the unipolar AD converter is convenient to sample, and after the sampling value is obtained, the voltage lifting value is subtracted by the singlechip, so that the input voltage value can be calculated. Therefore, the data acquisition device only needs to adopt a unipolar AD converter, thereby greatly reducing the cost of the whole device. Moreover, the device can collect negative pressure signals and positive pressure signals, and the accuracy is high.
Drawings
FIG. 1 is a schematic diagram of a high-precision data acquisition device of the present utility model;
FIG. 2 is a schematic diagram of an acquisition module in the high-precision data acquisition device of the present utility model;
fig. 3 is a circuit schematic of an amplifying circuit in the high-precision data acquisition device of the present utility model.
Detailed Description
The present utility model will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the high-precision data acquisition device of the utility model comprises a main control module and an acquisition module, wherein the acquisition module is used for acquiring target data, and the main control module is used for transmitting the acquired target data to an upper computer. The main control module comprises a singlechip. The number of the acquisition modules can be one or more, and in this embodiment, the number of the acquisition modules is 8. In this embodiment, the main control module is integrated on the main board, and the collection module is integrated on the collection board, and the backplate is through plugging the circuit and supply power for collection board and main board to provide physical connection for both communication.
As shown in fig. 1, the acquisition module includes an MCU, an AD converter and an acquisition unit, where the AD converter is a unipolar AD converter. The number of the acquisition units is not less than two, the number of the acquisition channels can be flexibly configured according to market demands, the production is convenient, and the after-sale maintenance is convenient. In this embodiment, there are 16 acquisition units.
As shown in fig. 2, the acquisition unit contains an acquisition circuit and an amplification circuit. The acquisition circuit comprises a voltage dividing circuit and a filter circuit, wherein the input end V+ and the input end V-of the voltage dividing circuit are connected with a transmission line of the analog signal and are used for acquiring the analog signal. The output end of the voltage dividing circuit is connected with the input end of the filter circuit, in this embodiment, the voltage dividing circuit is a resistor voltage dividing circuit, the filter circuit is a capacitor filter circuit, and the specific circuit structures of the two circuits belong to the prior art and are not described herein. The voltage dividing circuit is used for dividing the acquired analog signals to a required level, and the filtering circuit is used for filtering and shaping the analog signals to obtain stable analog signals. The output end of the filter circuit is the output end V+ and the output end V-of the acquisition circuit.
As shown in fig. 3, the output terminal v+ of the acquisition circuit is connected to one end of the resistor R4, the other end of the resistor R4 is connected to the inverting input terminal of the differential amplifier, the output terminal V-of the acquisition circuit is connected to one end of the resistor R5, the other end of the resistor R5 is connected to the non-inverting input terminal of the differential amplifier, the non-inverting input terminal of the differential amplifier is connected to one end of the resistor R6, and the other end of the resistor R6 is connected to the bias voltage VREF. The output end of the differential amplifier is connected with one end of a resistor R7, and the other end of the resistor R7 is connected with the inverting input end of the differential amplifier to form negative feedback. Bias voltage VREF is added to the homodromous input end of the differential amplifier, so that the input voltage is lifted, when the input voltage is negative voltage, positive voltage can be obtained at the output end, the single-polarity AD converter is convenient to sample, and after the sampling value is obtained, the voltage lifting value is subtracted by the singlechip, so that the input voltage value can be calculated. The bias voltage VREF adopts a high-precision voltage reference source so as to ensure acquisition precision. The bias voltage VREF with high precision is utilized to enable the whole device to adopt a unipolar AD converter, and compared with a traditional bipolar AD converter, the cost of the whole device is greatly reduced.
The output ends of the differential amplifier are respectively connected with the input end of an isolation optocoupler, and the specific connection mode belongs to the prior art and is not described in detail here. The output ends of the isolation optocouplers are connected with the AD converter. The input end of the isolation optocoupler obtains an analog signal, and then the analog signal which is formed after isolation at the output end of the isolation optocoupler is transmitted to the AD converter.
As shown in fig. 1 and 2, the AD converter is connected to the MCU, and the MCU is adaptively connected to the main control module. The AD converter is used for converting the analog signals into digital signals, the MCU reads the digital signals and transmits the digital signals to the main control module, and the main control module transmits the obtained digital signals to the upper computer.
As shown in fig. 1, a CanFD bus is provided between the MCU and the host module. And the acquisition module and the main control module are communicated by adopting CanFD. The effective data of each frame of the CanFD message is 64 bytes, the effective data of each frame of the CanFD message occupies more than 70 percent of the whole frame of the message information, and the highest data transmission rate reaches 5Mbit/s, thereby better meeting the application requiring high real-time performance and high data transmission rate.
In this embodiment, the AD converter is a 16bit high-precision high-speed AD, and samples for several times to average, calculate a sampling value, and further ensure the sampling precision.
The acquisition board and the main board of the high-precision data acquisition device are arranged on the back board through the connector, so that the high-precision data acquisition device is convenient to produce and maintain. The acquisition device can be connected with a main board and a plurality of acquisition board boards in an inserting mode according to requirements, and each acquisition board comprises 16 paths of acquisition channels. In order to improve communication speed, canFD communication is adopted between the acquisition board and the main board, network port communication (UDP protocol) is adopted from the main board to the upper computer, the main board gives the acquisition board the number of times (5 ms/time) at regular time, the acquisition board uploads the voltage or temperature value of each channel to the main board according to the protocol, and the main board packages and uploads the received data to the upper computer. Meanwhile, the acquisition board and the main board are communicated by adopting CanFD. The effective data of each frame of the CanFD message is 64 bytes, the effective data of each frame of the CanFD message occupies more than 70 percent of the whole frame of the message information, and the highest data transmission rate reaches 5Mbit/s, thereby better meeting the application requiring high real-time performance and high data transmission rate.
Claims (7)
1. A high-precision data acquisition device comprises a main control module and an acquisition module; the acquisition module comprises an MCU, an AD converter and an acquisition unit, and the acquisition unit comprises an acquisition circuit and an amplifying circuit; the input end of the acquisition circuit inputs an analog signal to be acquired, the output end of the acquisition circuit is connected with the amplifying circuit in an adaptive manner, the amplifying circuit is connected with the AD converter in an adaptive manner, the AD converter is connected with the MCU in an adaptive manner, and the MCU is connected with the main control module in an adaptive manner; the AD converter is characterized by being a unipolar AD converter; the amplifying circuit comprises a differential amplifier, an output end V+ of the collecting circuit is connected with one end of a resistor R4, the other end of the resistor R4 is connected with an inverting input end of the differential amplifier, an output end V-of the collecting circuit is connected with one end of a resistor R5, the other end of the resistor R5 is connected with an in-phase input end of the differential amplifier, the in-phase input end of the differential amplifier is connected with one end of a resistor R6, the other end of the resistor R6 is connected with a bias voltage VREF, the output end of the differential amplifier is connected with one end of a resistor R7, the other end of the resistor R7 is connected with the inverting input end of the differential amplifier, and the output end of the differential amplifier is connected with an AD converter in an adaptive manner.
2. The high-precision data acquisition device of claim 1, wherein an isolation optocoupler is provided between the output of the differential amplifier and the AD converter.
3. The high-precision data acquisition device according to claim 1, wherein at least two acquisition units are provided, and an isolation optocoupler is arranged between each acquisition unit and the AD converter.
4. The high precision data acquisition device of claim 2, wherein there are 16 acquisition units.
5. The high-precision data acquisition device as claimed in claim 1, wherein the acquisition circuit comprises a voltage division circuit and a filter circuit, wherein an analog signal to be acquired is input to an input end of the voltage division circuit, an output end of the voltage division circuit is connected with an input end of the filter circuit, and an output end of the filter circuit is an output end V+ and an output end V-of the acquisition circuit.
6. The high-precision data acquisition device of claim 1, wherein there are no fewer than two acquisition modules.
7. The high-precision data acquisition device of claim 1, wherein a CanFD bus is provided between the MCU and the host module.
Priority Applications (1)
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CN202321589441.0U CN220085273U (en) | 2023-06-21 | 2023-06-21 | High-precision data acquisition device |
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CN202321589441.0U CN220085273U (en) | 2023-06-21 | 2023-06-21 | High-precision data acquisition device |
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CN220085273U true CN220085273U (en) | 2023-11-24 |
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