CN108107773B - Multichannel data acquisition system - Google Patents
Multichannel data acquisition system Download PDFInfo
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- CN108107773B CN108107773B CN201711174833.XA CN201711174833A CN108107773B CN 108107773 B CN108107773 B CN 108107773B CN 201711174833 A CN201711174833 A CN 201711174833A CN 108107773 B CN108107773 B CN 108107773B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
- G05B19/0425—Safety, monitoring
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/26—Pc applications
- G05B2219/2612—Data acquisition interface
Abstract
The invention provides a multi-channel data acquisition system. It includes: a power source; m groups of sensor chips, wherein each group of sensor chips consists of N sensor units; and a data acquisition module comprising: the sensor chip comprises at least N channels and at least M input ports, wherein each input port can be connected with a corresponding group of sensor chips in an on-off manner; each output port is connected with one of the at least N channels and can be connected with a ground wire in a break-make mode; wherein at least N output ports are configured to allow simultaneous connection to ground to simultaneously acquire data of N sensor units on a corresponding group of sensor chips when one of the input ports is in communication with the group of sensor chips; or at least N output ports are configured to select one or more output ports to be connected with the ground line so as to acquire data of one or more corresponding sensor units on a group of sensor chips when one input port is communicated with the corresponding group of sensor chips.
Description
Technical Field
The invention relates to the technical field of electronic information communication, in particular to a multi-channel data acquisition system.
Background
The distributed test system with a large number of test terminals has wide application in industrial production, wherein the task of the multichannel data acquisition and test system is to acquire analog signals output by the sensors, convert the analog signals into digital signals which can be recognized by a computer, and send the digital signals to the computer, and the computer can display or convert the acquired data.
At present, the number of channels of a data acquisition card is limited, and when data acquisition is required to be performed on a large number of sensors, a next sensor is generally replaced to perform data acquisition after data of one sensor is acquired, and so on until data of all sensors are acquired. Obviously, the data acquisition mode has low efficiency, and in order to solve the technical problems, the existing technology expands the channel of the data acquisition card by improving the data acquisition card. However, through a lot of research, it is found that although the number of channels of the data acquisition card is increased, the cost is increased sharply by increasing the number of channels, and it is very difficult to increase the number of channels after the number of channels reaches a certain value, which is mainly limited by the withstand voltage of the input port, the range of the input signal, the impedance of the analog input, the resolution, the gain multiple, and the like. In addition, although the channel of the acquisition card can be expanded by improving the acquisition card, when facing a large-scale sensor, the data acquisition of the large-scale sensor cannot be completed at one time or by using a small number of times.
Disclosure of Invention
The invention aims to solve the technical problems that in the prior art, the number of channels of a data acquisition module is small, and any channel expansion cannot be realized.
A further object of the present invention is to solve the technical problem of low data collection efficiency of a single data collection module in the prior art.
Another further object of the present invention is to solve the technical problem of the prior art that signals in a test circuit are prone to crosstalk.
The invention provides a multi-channel data acquisition system, comprising:
a power source;
m groups of sensor chips, wherein each group of sensor chips consists of N sensor units; and
a data acquisition module comprising:
at least N channels, N said channels corresponding to said N sensor units, respectively;
at least M input ports, each of which is connected with the at least N channels, wherein the M input ports respectively correspond to the M groups of sensor chips, and each of the M input ports can be connected with a corresponding group of sensor chips in an on-off manner; and
the output ports are respectively corresponding to the sensor units, and each output port is connected with one of the channels and can be connected with a ground wire in a break-make mode;
wherein the power supply is configured to supply power to a corresponding group of the sensor chips when one of the input ports is in communication with the group of sensor chips, and the power supply is configured to allow selective power supply to one of the groups of sensor chips;
wherein the at least N output ports are configured to allow simultaneous connection to the ground line to simultaneously acquire data of the N sensor units on a corresponding group of the sensor chips when one of the input ports is in communication with the group of sensor chips; or, the at least N output ports are configured to select one or more of the output ports to be connected to the ground line, so as to acquire data of one or more corresponding sensor units on a corresponding group of sensor chips when one of the input ports is communicated with the corresponding group of sensor chips.
Optionally, the number of the data acquisition modules is one.
Optionally, the multichannel data acquisition system further comprises:
the M relays correspond to the M groups of sensor chips respectively, and each relay is selectively connected with the power supply; and
and the first analog switch is used for selecting one relay from the at least M relays so as to enable the relay to be connected with the power supply, so that the power supply supplies power to a group of sensor chips corresponding to the relay.
Optionally, the multichannel data acquisition system further comprises:
a second analog switch for selecting one output port from the at least N output ports so that the output port is connected to the ground.
Optionally, the multichannel data acquisition system further comprises:
the data acquisition module is used for acquiring a voltage value of the fixed load, and the data acquisition module is used for acquiring the voltage value of the fixed load.
Optionally, the data acquisition module is configured to obtain the resistance value of the corresponding sensor unit according to the voltage value at each fixed load.
Optionally, the multichannel data acquisition system further comprises:
the M diodes correspond to the M groups of sensor chips respectively, one end of each diode is connected with one of the input ports of the data acquisition module, and the other end of each diode is connected with one group of sensor chips in the M groups of sensor chips.
Optionally, the power supply is configured to not allow power to be supplied to the M groups of sensor chips simultaneously.
Optionally, the power supply is configured to allow selective power supply to only one of the M groups of sensor chips.
According to an aspect of the invention, the data acquisition system is configured to extend at least N channels of a single data acquisition module to at least M x N channels. In the above specific embodiment, the 16 channels of a single data acquisition module are expanded into 256 channels. Through the control of the first analog switch and the second analog switch, the expansion of a plurality of channels can be realized, and even the expansion of any channel can be realized, so that the efficiency of data acquisition can be improved, and the cost is greatly reduced. The expansion of the channels is not needed to be realized through hardware equipment, namely, the channels are not needed to be expanded through a plurality of data acquisition modules, the expansion of a large number of channels can be realized through only one data acquisition module, the high-efficiency data acquisition of a large number of sensor chips is realized, and the great contribution is made to the prior art.
In addition, when data of all the sensor chips are collected, all the sensor chips can be placed on the same substrate, and when the data of one group of sensor chips are collected, the sensor chips do not need to be manually replaced, and the data of other groups of sensor chips are collected directly through the control of the first analog switch and the second analog switch. In addition, when data on each sensor unit of each group of sensor chips are collected, the data are collected after being stabilized, and the accuracy of data collection of the data collection module at different moments can be improved.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a schematic and diagrammatic view of a multi-channel data acquisition system in accordance with an embodiment of the present invention;
FIG. 2 is a schematic and schematic diagram of a data acquisition module according to one embodiment of the present invention;
FIG. 3 is a schematic diagram of a first analog switch in accordance with one embodiment of the present invention;
FIG. 4 is a schematic diagram of sixteen relays according to one embodiment of the present invention;
fig. 5 is a schematic diagram of a power supply according to one embodiment of the invention.
Detailed Description
Fig. 1 shows a schematic principle diagram of a multi-channel data acquisition system according to an embodiment of the invention. As shown in fig. 1, the multichannel data acquisition system may include a power supply, M groups of sensor chips, and a data acquisition module. Each group of sensor chips consists of N sensor units. The data acquisition module comprises at least N channels, at least M input ports and at least N output ports. The N channels correspond to the N sensor units respectively, each input port is connected with at least the N channels, the M input ports correspond to the M groups of sensor chips respectively, and each input port in the M input ports can be connected with the corresponding group of sensor chips in a break-make mode. The N output ports correspond to the N sensor units respectively, and each output port is connected with one of the N channels and can be connected with a ground wire in a break-make mode. The power supply is configured to supply power to a corresponding set of sensor chips when one of the input ports is in communication with the set of sensor chips, and the power supply is configured to allow selective power supply to one of the sets of sensor chips. Wherein at least N output ports are configured to allow simultaneous connection to ground to simultaneously acquire data of N sensor units on a corresponding group of sensor chips when one of the input ports is in communication with the group of sensor chips; or at least N output ports are configured to select one or more output ports to be connected with the ground so as to acquire data of one or more corresponding sensor units on a group of sensor chips when one input port is communicated with the corresponding group of sensor chips. Wherein M and N are both positive integers greater than zero. The data acquisition module may be, for example, an MCU or a data acquisition card with logic control.
In one embodiment, M and N are sixteen each. That is, the multi-channel data acquisition system includes sixteen sets of sensor chips, as shown in fig. 1 as P1 through P16. Each group of SENSOR chips is composed of sixteen SENSOR cells, such as SENSOR1 through SENSOR16 shown in fig. 1. The sixteen sensor units are arranged in an array on the set of sensor chips. The sixteen groups of sensor chips are arranged in an array. In one embodiment, each group of sensor chips is connected with a diode, one end of the diode is connected with one group of sensor chips, and the other end of the diode is connected with one input port of the data acquisition module. The number of diodes is sixteen, as shown in fig. 1 at D1 through D16. Because the diode can conduct signals on the circuit in a single direction, the crosstalk of the signals of the acquisition circuit can be prevented through the diode in the data acquisition process.
In one embodiment, a data acquisition module may include sixteen channels, sixteen input ports, and sixteen output ports. Here, as shown in fig. 1, sixteen input ports are AD1 to AD16, respectively. The multi-channel data acquisition system further comprises at least N fixed loads, for example, but not limited thereto, sixteen fixed loads may be provided. One end of each fixed load is connected with the ground wire, and the other end of each fixed load is connected with one of the at least N output ports, so that the data acquisition module acquires the voltage value of the fixed load. Namely, the data acquired by the data acquisition module is the voltage value at the fixed load, and the resistance value of the corresponding sensor unit is deduced through ohm's law.
FIG. 2 shows a schematic diagram of a data acquisition module according to one embodiment of the invention. As shown in fig. 2, the data acquisition module has sixteen channels, AD1 to AD 16. The data acquisition module is also provided with two logic control ports, wherein one logic control port is CRL1(0:3), and the other logic control port is CRL2(0: 3).
Fig. 3 shows a schematic diagram of a first analog switch according to an embodiment of the invention. As shown in fig. 3, the first analog switch U3 has a plurality of signal interfaces, the number of which at least corresponds to the number of groups of sensor chips, for example sixteen signal interfaces, I0 to I15, respectively. One end of each signal interface is connected with the corresponding relay interface I (0:15), and the other end of each signal interface is connected with one logic control port CRL1(0: 3).
Fig. 4 shows a schematic diagram of sixteen relays according to one embodiment of the present invention. Fig. 5 shows a schematic diagram of a power supply according to an embodiment of the invention. As can be seen from fig. 4 and 5, the sixteen relays are respectively connected to sixteen signal interfaces of the first analog switch U3 to be controlled by the first analog switch U3, and each relay is connected to the power source. When one signal interface of the first analog switch is communicated with one corresponding relay, the power supply supplies power to the sensor chip corresponding to the signal interface.
Referring to fig. 1, the multi-channel data acquisition system further includes a second analog switch U4. The second analog switch U4 may include a number of signal interfaces at least corresponding to the number of sensor units to correspond to the sensor units, for example sixteen signal interfaces, I0 to I15, respectively. One end of each signal interface in the second analog switch is connected with a ground wire, and the other end of each signal interface in the second analog switch is connected with the other logic control port CRL2(0: 3). When one signal interface in the second analog switch is communicated with the ground wire, the data of the corresponding sensor unit in the corresponding group of sensor chips can be acquired. When all signal interfaces in the second analog switch are connected with the ground wire, the data of all the sensor units in the corresponding group of sensor chips can be acquired.
Referring to fig. 1 for explanation, in one embodiment, if data of a first SENSOR unit SENSOR1 on a first group of SENSOR chips P1 needs to be acquired, a first input port AD1 of a data acquisition module is gated through a first analog switch to supply power to the first group of SENSOR chips P1, and other groups of SENSOR chips are not powered at this time, and a first output port of the data acquisition module is gated through a second analog switch to communicate with a first channel of the data acquisition module, so that a voltage value of a first fixed load is acquired, and a corresponding resistance value of the first SENSOR unit SENSOR1 on the first group of SENSOR chips P1 is inferred according to ohm's law.
If the data of the third SENSOR unit SENSOR19 on the second group of SENSOR chips P2 needs to be acquired, the second input port AD2 of the data acquisition module is gated through the first analog switch to supply power to the second group of SENSOR chips P2, the other groups of SENSOR chips are not powered at this time, the third output port of the data acquisition module is gated through the second analog switch to be communicated with the third channel of the data acquisition module, the voltage value of the third fixed load is acquired, and the resistance value of the corresponding third SENSOR unit SENSOR19 on the second group of SENSOR chips P2 is deduced according to ohm's law.
If the data of the first SENSOR unit SENSOR33 and the second SENSOR unit SENSOR34 on the third group of SENSOR chips P3 needs to be acquired, the third input port AD3 of the data acquisition module is gated through the first analog switch to supply power to the third group of SENSOR chips, the other groups of SENSOR chips are not powered at this time, the first output port and the second output port of the data acquisition module are gated through the second analog switch to communicate the first channel and the second channel of the data acquisition module, voltage values of the first fixed load and the second fixed load are acquired, and corresponding resistance values of the first SENSOR unit SENSOR33 and the second SENSOR unit SENSOR34 on the third group of SENSOR chips P3 are deduced according to ohm's law.
When data of all the sensor chips are acquired, all the sensor chips can be placed on the same substrate, and when the data of one group of sensor chips are acquired, the sensor chips do not need to be manually replaced, but the data of other groups of sensor chips are acquired directly under the control of the first analog switch and the second analog switch. In addition, when data on each sensor unit of each group of sensor chips are collected, the data are collected after being stabilized, and the accuracy of data collection of the data collection module at different moments can be improved.
In other embodiments, M and N may each have other values of eighteen, twenty, etc., and M and N may not have equal values. The number of the data acquisition modules is one.
According to an embodiment of the invention, the data acquisition system expands at least N channels of a single data acquisition module to at least M × N channels. In the above specific embodiment, the 16 channels of a single data acquisition module are expanded into 256 channels. Through the control of the first analog switch and the second analog switch, the expansion of a plurality of channels can be realized, and even the expansion of any channel can be realized, so that the efficiency of data acquisition can be improved, and the cost is greatly reduced. The expansion of the channels is not needed to be realized through hardware equipment, namely, the channels are not needed to be expanded through a plurality of data acquisition modules, the expansion of a large number of channels can be realized through only one data acquisition module, the high-efficiency data acquisition of a large number of sensor chips is realized, and the great contribution is made to the prior art.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (9)
1. A multi-channel data acquisition system, comprising:
a power source;
m groups of sensor chips, wherein each group of sensor chips consists of N sensor units; and
a data acquisition module comprising:
at least N channels, N said channels corresponding to said N sensor units, respectively;
at least M input ports, each of which is connected with the at least N channels, wherein the M input ports respectively correspond to the M groups of sensor chips, and each of the M input ports can be connected with a corresponding group of sensor chips in an on-off manner; and
the output ports are respectively corresponding to the sensor units, and each output port is connected with one of the channels and can be connected with a ground wire in a break-make mode;
wherein the power supply is configured to supply power to a corresponding group of the sensor chips when one of the input ports is in communication with the group of sensor chips, and the power supply is configured to allow selective power supply to one of the groups of sensor chips;
wherein the at least N output ports are configured to allow simultaneous connection to the ground line to simultaneously acquire data of the N sensor units on a corresponding group of the sensor chips when one of the input ports is in communication with the group of sensor chips; or, the at least N output ports are configured to select one or more of the output ports to be connected to the ground line, so as to acquire data of one or more corresponding sensor units on a corresponding group of sensor chips when one of the input ports is communicated with the corresponding group of sensor chips.
2. The multi-channel data acquisition system of claim 1 wherein the number of data acquisition modules is one.
3. The multi-channel data acquisition system of claim 1, further comprising:
the M relays correspond to the M groups of sensor chips respectively, and each relay is selectively connected with the power supply; and
and the first analog switch is used for selecting one relay from the at least M relays so as to enable the relay to be connected with the power supply, so that the power supply supplies power to a group of sensor chips corresponding to the relay.
4. The multi-channel data acquisition system of claim 3, further comprising:
a second analog switch for selecting one output port from the at least N output ports so that the output port is connected to the ground.
5. The multi-channel data acquisition system according to any one of claims 1-4, further comprising:
the data acquisition module is used for acquiring a voltage value of the fixed load, and the data acquisition module is used for acquiring the voltage value of the fixed load.
6. The multi-channel data acquisition system of claim 5, wherein the data acquisition module is configured to obtain the resistance value of the corresponding sensor unit from the voltage value at each fixed load.
7. The multi-channel data acquisition system according to any one of claims 1-4, further comprising:
the M diodes correspond to the M groups of sensor chips respectively, one end of each diode is connected with one of the input ports of the data acquisition module, and the other end of each diode is connected with one group of sensor chips in the M groups of sensor chips.
8. The multi-channel data acquisition system according to any one of claims 1-4, wherein the power supply is configured to not allow simultaneous power supply to the M groups of sensor chips.
9. The multi-channel data acquisition system of claim 8 wherein the power supply is configured to allow selective power to only one of the M groups of sensor chips.
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| CN108802528A (en) * | 2018-06-11 | 2018-11-13 | 中国水利水电科学研究院 | A kind of channel measurement device and method |
| CN109783437B (en) * | 2019-01-28 | 2023-08-08 | 北京经纬恒润科技股份有限公司 | Chip control method and device |
| CN113110247B (en) * | 2021-05-18 | 2021-12-03 | 中国地震局地球物理研究所 | Multichannel data acquisition control circuit |
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| US7280435B2 (en) * | 2003-03-06 | 2007-10-09 | General Electric Company | Switching circuitry for reconfigurable arrays of sensor elements |
| CN101373963A (en) * | 2008-09-24 | 2009-02-25 | 南京大学 | Multichannel packet switching device for expanding basic data acquisition equipment channel number |
| CN104614407B (en) * | 2015-02-05 | 2018-06-19 | 苏州慧闻纳米科技有限公司 | A kind of gas monitoring system |
| CN205564003U (en) * | 2016-04-28 | 2016-09-07 | 北京亿中盛科技发展有限公司 | Intelligent data acquisition device based on multisensor |
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