CN215493810U - Multichannel isolated current signal acquisition system - Google Patents
Multichannel isolated current signal acquisition system Download PDFInfo
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- CN215493810U CN215493810U CN202121254816.9U CN202121254816U CN215493810U CN 215493810 U CN215493810 U CN 215493810U CN 202121254816 U CN202121254816 U CN 202121254816U CN 215493810 U CN215493810 U CN 215493810U
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Abstract
The utility model discloses a multichannel isolated current signal acquisition system, which is characterized in that: the diagnostic signal is directly provided by a half-value pin of a reference source of the ADC, the diagnostic source does not need to be designed independently, the switching of the diagnostic signal and the normal input signal is realized by using an analog switch with a small volume, the dynamic diagnostic switching is executed by a parallel processor, all channels can realize simultaneous diagnosis, and the diagnosis and the normal acquisition of all the channels are completed in one period. The utility model has the main characteristics of simplifying the circuit, realizing miniaturization, supporting more independent channels and simultaneously meeting the requirements of high reliability and high stability.
Description
Technical Field
The utility model relates to the technical field of nuclear industry digital instrument control, in particular to a multichannel isolated current signal acquisition system.
Background
In the field of industrial control, in particular in the field of digital instrumentation in nuclear power plants, there is monitoring of a large number of current signals. Meanwhile, the channels have the requirement of mutual isolation to meet the requirement of independence and mutual noninterference among the channels. Particularly, in the fields of ships, aviation and the like, the space is small, and the miniaturization design is also required to be considered. However, most current signal acquisition devices do not achieve a miniaturized and highly reliable design at the same time.
SUMMERY OF THE UTILITY MODEL
The utility model provides a multichannel isolated current signal acquisition system for solving the problems, which has the functions of miniaturization, inter-channel isolation and dynamic diagnosis with channels, supports multichannel simultaneous diagnosis and meets the requirements of high reliability and high stability.
The utility model is realized by the following technical scheme:
a multi-channel isolated current signal acquisition system comprises a plurality of input channels, wherein each input channel comprises an acquisition signal input unit, a diagnosis signal input unit, an ADC (analog-to-digital converter) and a digital isolator; the acquisition signal input unit and the diagnosis signal input unit share the analog switch to be connected with the input end of the ADC, the output end of the ADC is connected with the input end of the digital isolator, and the output end of the digital isolator is used for being connected with the input end of the processor; the reference source is shared by the reference of the ADC converter and the diagnostic signal of the diagnostic signal input unit; the power supply of the ADC and the reference share one reference power supply; the digital isolator is integrated with bus isolation and power isolation; the acquisition signal input unit is used for inputting an acquired current signal; the analog signal input unit is used for inputting a diagnosis signal.
The utility model provides a miniaturized current signal acquisition system with isolation among channels and dynamic diagnosis, which is characterized in that: the diagnostic signal is directly provided by a half-value pin of a reference source of the ADC, the diagnostic source does not need to be designed independently, the switching of the diagnostic signal and the normal input signal is realized by using an analog switch with a small volume, the dynamic diagnostic switching is executed by a parallel processor, all channels can realize simultaneous diagnosis, and the diagnosis and the normal acquisition of all the channels are completed in one period.
Further preferably, the common reference source is configured to output two voltages, one being a reference voltage of the ADC converter and the other being a diagnostic signal, of reference voltages REF and REF/2.
Further preferably, the collected signal input unit includes a sampling resistor R, and an input end of the sampling resistor R is used for inputting a current signal and converting the input current signal into a differential voltage signal.
Preferably, the collected signal input unit further comprises a differential operational amplifier, an input end of the sampling resistor R is used for inputting a current signal, and an output end of the sampling resistor R is connected with an input end of the differential operational amplifier; and the differential operational amplifier is used for converting the differential voltage signal into a single-ended signal.
Further preferably, the ADC converter employs a single channel ADC.
Further preferably, the type of the digital isolator adopts ADuM5410/ADuM5411/ADuM 5412. The digital isolation chip can realize bus isolation and power isolation, and the power isolation and the bus isolation are integrated in one chip, so that the purpose of miniaturization design is achieved, and the isolation power supply does not need to be designed independently.
Further preferably, the device further comprises a processor and a signal connector; a plurality of input channels are arranged between the signal connector and the processor.
Further preferably, the processor is configured to control dynamic diagnostic switching, and all channels may implement simultaneous diagnosis and complete diagnosis and normal acquisition of all channels in one cycle. The input path is provided with an analog switch for switching the normal acquisition and diagnosis signals, and the channel diagnosis function can be realized by only adding one analog switch in the acquisition channel, so that the miniaturization design is realized, and the requirement on reliability is met; meanwhile, the analog switch is controlled by the processor, and the functions of normal acquisition and channel diagnosis can be realized simultaneously in one processing period.
The utility model has the following advantages and beneficial effects:
the utility model provides a miniaturized current signal acquisition system with isolation among channels and dynamic diagnosis, which is characterized in that: the diagnostic signal is directly provided by a half-value pin of a reference source of the ADC, the diagnostic source does not need to be designed independently, the switching of the diagnostic signal and the normal input signal is realized by using an analog switch with a small volume, the dynamic diagnostic switching is executed by a parallel processor, all channels can realize simultaneous diagnosis, and the diagnosis and the normal acquisition of all the channels are completed in one period.
The utility model can be applied to the fields of nuclear power, ships, aviation and the like with high requirements on volume and reliability, and realizes the acquisition of industrial standard current signals. Assuming that the front stage is an industrial signal with 4-20 mA standard, the signal is acquired by the ADC and converted into a digital signal, and the digital signal is sent to the processor, and then the current signal is processed by the processor. In the field with higher requirements on space and reliability, the design has great application prospect.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the utility model and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the utility model and together with the description serve to explain the principles of the utility model. In the drawings:
fig. 1 is a functional structure diagram of a multi-channel isolated current signal acquisition system according to the present invention.
FIG. 2 is a schematic diagram of a digital isolator.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
The embodiment provides a multi-channel isolated current signal acquisition system, which comprises a plurality of input channels, wherein each input channel comprises an acquired signal input unit, a diagnosis signal input unit, an ADC (analog-to-digital converter) and a digital isolator; the acquisition signal input unit and the diagnosis signal input unit share the analog switch to be connected with the input end of the ADC, the output end of the ADC is connected with the input end of the digital isolator, and the output end of the digital isolator is used for being connected with the input end of the processor. The input path has an analog switch for switching between normal acquisition and diagnostic signals.
The reference of the ADC and the diagnostic signal of the diagnostic signal input unit share a reference source, and the diagnostic signal is directly provided by a half-value pin of the reference source of the ADC; the common reference source generally outputs two voltages, namely reference voltage REF and REF/2, one is used as the reference of the ADC converter, and the other is used as a diagnostic signal, so that the miniaturization design requirement is realized.
The power supply of the ADC and the reference share one reference power supply; the ADC bus adopts an isolator with power isolation, so that the circuit is simplified; the ADC converter adopts a single-channel ADC.
The digital isolator is integrated with bus isolation and power isolation; the model of the digital isolator adopts ADuM5410/ADuM5411/ADuM 5412. As shown in fig. 2, the digital isolation chip can realize bus isolation and power isolation, and the power isolation and the bus isolation are integrated into one chip, so as to achieve the purpose of miniaturization design without separately designing an isolation power supply.
The acquisition signal input unit is used for inputting an acquired current signal; and the analog signal input unit is used for inputting the diagnostic signal.
The acquisition signal input unit comprises a sampling resistor R and a differential operational amplifier, wherein the input end of the sampling resistor R is used for inputting a current signal and converting the input current signal into a differential voltage signal. The input end of the sampling resistor R is used for inputting a current signal, and the output end of the sampling resistor R is connected with the input end of the differential operational amplifier; and the differential operational amplifier is used for converting the differential voltage signal into a single-ended signal.
Example 2
The system is further improved based on the embodiment 1, and further comprises a processor and a signal connector; a plurality of input channels are provided between the signal connector and the processor as shown in fig. 1. The processor is used for controlling dynamic diagnosis switching, all channels can realize simultaneous diagnosis, and the diagnosis and normal acquisition of all channels are completed in one period.
In summary, the present embodiment provides a miniaturized, highly reliable, and multichannel isolated current signal acquisition system, and the main optimization design includes simplification of channel diagnosis, simplification of channel isolation, and simplification of ADC acquisition:
simplification of the channel diagnostics: the diagnostic signal and the channel ADC share one reference source, and the channel diagnosis only adds an analog switch on the original circuit.
Simplification of channel isolation: the power supply isolation and the signal isolation are integrated on one chip.
Simplification of ADC acquisition: the power supply of the ADC shares a reference power supply with the reference.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A multi-channel isolated current signal acquisition system comprises a plurality of input channels, and is characterized in that each input channel comprises an acquisition signal input unit, a diagnosis signal input unit, an ADC (analog-to-digital converter) and a digital isolator; the acquisition signal input unit and the diagnosis signal input unit share the analog switch to be connected with the input end of the ADC, the output end of the ADC is connected with the input end of the digital isolator, and the output end of the digital isolator is used for being connected with the input end of the processor;
the reference source is shared by the reference of the ADC converter and the diagnostic signal of the diagnostic signal input unit; the power supply of the ADC and the reference share one reference power supply; the digital isolator is integrated with bus isolation and power isolation;
the acquisition signal input unit is used for inputting an acquired current signal; the analog signal input unit is used for inputting a diagnosis signal.
2. A multi-channel isolated current signal acquisition system according to claim 1 wherein said common reference source is adapted to output two voltages, one as reference for the ADC converter and one as diagnostic signal, reference voltages REF and REF/2.
3. The multi-channel isolated current signal acquisition system as claimed in claim 1, wherein the acquisition signal input unit comprises a sampling resistor R, and an input end of the sampling resistor R is used for inputting a current signal and converting the input current signal into a differential voltage signal.
4. The multichannel isolated current signal acquisition system according to claim 3, wherein the acquisition signal input unit further comprises a differential operational amplifier, the input end of the sampling resistor R is used for inputting a current signal, and the output end of the sampling resistor R is connected with the input end of the differential operational amplifier; and the differential operational amplifier is used for converting the differential voltage signal into a single-ended signal.
5. The multi-channel isolated current signal acquisition system of claim 1 wherein said ADC converter employs a single channel ADC.
6. The multi-channel isolated current signal acquisition system of claim 1 wherein the digital isolators are of the type ADuM5410/ADuM5411/ADuM 5412.
7. A multichannel isolated current signal acquisition system according to any of claims 1 to 6 further comprising a processor and a signal connector; a plurality of input channels are arranged between the signal connector and the processor.
8. The multi-channel isolated current signal acquisition system of claim 7 wherein the processor is configured to control dynamic diagnostic switching, wherein all channels can be diagnosed simultaneously, and wherein all channels are diagnosed and normally acquired in a single cycle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202121254816.9U CN215493810U (en) | 2021-06-04 | 2021-06-04 | Multichannel isolated current signal acquisition system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121254816.9U CN215493810U (en) | 2021-06-04 | 2021-06-04 | Multichannel isolated current signal acquisition system |
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| CN215493810U true CN215493810U (en) | 2022-01-11 |
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| CN202121254816.9U Active CN215493810U (en) | 2021-06-04 | 2021-06-04 | Multichannel isolated current signal acquisition system |
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