CN115793541A

CN115793541A - Multi-channel multi-type signal high-speed data acquisition card and control method thereof

Info

Publication number: CN115793541A
Application number: CN202211566050.7A
Authority: CN
Inventors: 王美林; 张义名扬; 唐玉涵; 肖文; 冯志鹏; 何家贤; 邸江磊
Original assignee: Guangdong University of Technology
Current assignee: Guangdong University of Technology
Priority date: 2022-12-07
Filing date: 2022-12-07
Publication date: 2023-03-14

Abstract

The invention provides a multi-channel multi-type signal high-speed data acquisition card and a control method thereof, wherein the data acquisition card comprises a signal input module, N signal input expansion modules, a signal type switching module, an analog-to-digital conversion module, an isolation module, a control module, a data transmission module and a power supply module; the signal input module and all the signal input expansion modules are electrically connected with the signal type switching module in a parallel connection mode; the output end of the signal type switching module is electrically connected with the analog-to-digital conversion module; the analog-to-digital conversion module is electrically connected with the control module through the isolation module; the control module is also electrically connected with the signal type switching module and the data transmission module respectively, and the data transmission module is connected with external equipment; the invention can realize the acquisition of a large number of multi-channel and multi-type sensor signals; the control method provided by the invention improves the efficiency and reliability of data acquisition through a rotation type channel switching strategy and a cycle acquisition working mode.

Description

Multi-channel multi-type signal high-speed data acquisition card and control method thereof

Technical Field

The invention relates to the technical field of sensor signal acquisition, in particular to a multi-channel multi-type signal high-speed data acquisition card and a control method thereof.

Background

Along with the continuous improvement of the automation degree of industrial equipment, more and more sensors are required to collect environment and equipment data, the types of the sensors are increased, the types of output signals of the sensors are various and have advantages and disadvantages, and a data acquisition card with more functions is required for simultaneously collecting a plurality of sensors and various types of sensors.

The prior art at present provides a high-precision synchronous vibration data acquisition card integrating multiple types of detection signals, which comprises 3 paths of IEPE interface circuits, wherein each path of IEPE interface circuit is connected with a constant current source circuit, the output end of the IEPE interface circuit is sequentially connected with a program control amplifying circuit, a filter circuit, a single-end to differential circuit and an AD converter in series through the constant current source circuit, and the output end of a 4-20mA current input interface circuit is connected with the input end of an I/V conversion circuit; the output end of the I/V conversion circuit and the output end of the millivolt-level voltage input interface circuit are sequentially connected with the program-controlled amplifying circuit, the filter circuit, the single-end to differential circuit and the AD converter in series; the output end of the +/-5V voltage signal input interface circuit is sequentially connected with the filter circuit, the single-ended to differential circuit and the AD converter in series; AD converters in each interface circuit are connected to the single chip microcomputer after being cascaded; the control input ends of the program control amplifying circuits in the interface circuits are connected in parallel and then connected to the single chip microcomputer, and the single chip microcomputer is communicated with an upper computer through a USB port; the data acquisition card in the prior art can realize high-precision synchronous data acquisition, but the data acquisition card used in the technology is of fixed channel number and type, can not simultaneously acquire more data and also consider various sensor data, the channel number can not be flexibly increased or decreased according to an application scene, and the data parameters of the acquisition card need to be adjusted on line or cannot be adjusted, which is not favorable for high compatibility and high universality required by data acquisition; in addition, interference can be caused by switching the extension channel through a mechanical switch, the switching speed is low, the high-speed acquisition is not suitable, the extension channel signals are immediately acquired after the primary channel is acquired and switched to the extension channel through the analog switch, sufficient stabilization time is not provided for the extension channel signals, and the high-speed acquisition is not suitable.

Disclosure of Invention

The invention provides a multi-channel multi-type signal high-speed data acquisition card and a control method thereof, aiming at overcoming the defects that the prior art cannot acquire more signals and also considers multiple types of signal data at the same time, and the multi-channel multi-type signal high-speed data acquisition card can flexibly increase and decrease the number of channels according to application scenes to realize the high-speed acquisition of multi-type signals.

In order to solve the technical problems, the technical scheme of the invention is as follows:

the invention provides a multi-channel multi-type signal high-speed data acquisition card, which comprises a signal input module, N signal input expansion modules, a signal type switching module, an analog-to-digital conversion module, an isolation module, a control module, a data transmission module and a power supply module, wherein the signal input expansion modules are connected with the signal input module;

the output ends of the signal input modules and the output ends of all the signal input expansion modules are electrically connected with the input end of the signal type switching module in a parallel connection mode;

the output end of the signal type switching module is electrically connected with the input end of the analog-to-digital conversion module;

the output end of the analog-to-digital conversion module is electrically connected with the input end of the control module through the isolation module;

the output end of the control module is connected with the control end of the signal type switching module, the output end of the control module is electrically connected with the input end of the data transmission module, and the data transmission module is connected with external equipment;

the power supply module directly supplies power for the signal input module and the signal input expansion module, and supplies power for the signal type switching module, the analog-to-digital conversion module, the control module and the data transmission module through the isolation module.

Preferably, the signal input module includes M sensor signal input channels, each of the signal input expansion modules includes M sensor signal input expansion channels, the sensor signal input expansion channels correspond to the sensor signal input channels one to one, and M is an even number;

each sensor signal input channel and each sensor signal input expansion channel respectively comprise a positive terminal and a negative terminal; the positive terminal of each sensor signal input channel and the positive terminal of each sensor signal input extension channel are electrically connected with the input end of the signal type switching module in a parallel mode, and the negative terminal of each sensor signal input channel and the negative terminal of each sensor signal input extension channel are grounded.

Preferably, the signal type switching module comprises P channel switches, P resistor type switches, a filter circuit unit, Q signal type switches, a plurality of divider resistors and a plurality of sampling resistors, wherein P and Q satisfy that P is greater than or equal to M, and Q = P/2;

each channel change-over switch and each resistance type change-over switch are single-pole multi-throw switches and comprise a plurality of input ends, an output end and a control end;

each signal type change-over switch is a single-pole double-throw switch and comprises an input end, two output ends and a control end;

the filter circuit unit comprises P input ends and P output ends;

one input end of each channel switch is correspondingly and electrically connected with the positive terminal of one sensor signal input channel, and the rest input ends of the channel switches are correspondingly and electrically connected with the positive terminal of one sensor signal input expansion channel; the output end of each channel change-over switch is correspondingly and electrically connected with one input end of the filter circuit unit, and the control end of each channel change-over switch is electrically connected with the control module; each output end of the filter circuit unit is electrically connected with the input end of the analog-to-digital conversion module;

different input ends of one resistor type change-over switch are correspondingly and electrically connected with the output end of one channel change-over switch through different types of divider resistors, the output end of each resistor type change-over switch is electrically connected with the power supply module through the isolation module, and the control end of each resistor type change-over switch is electrically connected with the control module;

any output end of each signal type change-over switch is connected with a sampling resistor in series and then is correspondingly connected between every two output ends of the filter circuit unit in parallel, and the control end of each signal type change-over switch is electrically connected with the control module.

Preferably, the control module comprises an MCU main controller and an isolation controller;

the output end of the MCU main controller is connected with the control end of each channel change-over switch, the control end of each resistance type change-over switch and the control end of each signal type change-over switch through an isolation controller;

the MCU main controller is electrically connected with the analog-to-digital conversion module and the data transmission module through the isolation module.

Preferably, the isolation module comprises an isolated power supply and an isolated communication unit;

the power supply unit supplies power to each resistor model change-over switch, the analog-to-digital conversion module, the isolation communication unit and the isolation controller through an isolation power supply;

the MCU main controller is electrically connected with the analog-to-digital conversion module and the data transmission module through the isolation communication unit.

Preferably, the control module further comprises an expansion device electrically connected with the MCU main controller, and the expansion device comprises at least one of an external display screen, a buzzer, a knob, a key, a rocker, an indicator light and a loudspeaker.

The invention also provides a control method of the multi-channel multi-type signal high-speed data acquisition card, which is based on the multi-channel multi-type signal high-speed data acquisition card and comprises the following steps:

s1: acquiring initial configuration information of a data acquisition card;

s2: acquiring input signals of the mth or m and m +1 sensor signal input channels by using the corresponding working modes of the data acquisition card according to the initial configuration information of the data acquisition card, wherein m is an odd number;

s3: switching the mth or mth and m +1 channel selector switch to the correspondingly connected sensor signal input extension channel, namely, the mth or mth and m +1 sensor signal input extension channel;

s4: configuring a corresponding mth or mth and m +1 resistance model change-over switch and a corresponding mth signal type change-over switch according to the input signal type of the mth sensor signal input expansion channel;

s5: repeating the steps S2-S4 from the first sensor signal input channel, and sequentially acquiring input signals of all sensor signal input channels to obtain a data acquisition result of the primary channel;

s6: acquiring input signals of the mth or mth and m +1 sensor signal input extension channels by using the corresponding working modes of the data acquisition card according to the initial configuration information of the data acquisition card;

s7: switching the mth or m +1 th channel selector switch back to the correspondingly connected sensor signal input channel, namely the mth or m +1 th sensor signal input channel;

s8: reconfiguring a corresponding mth or mth and m +1 resistance model change-over switch and a corresponding mth signal type change-over switch according to the input signal type of the mth sensor signal input channel;

s9: repeating the steps S6-S8 from the input of the first sensor signal into the expansion channel, sequentially acquiring input signals of all the sensor signals input into the expansion channel to obtain a data acquisition result of the expansion channel, and taking the data acquisition result of the original channel and the data acquisition result of the expansion channel as the data acquisition results of all the channels;

s10: and repeating the steps S2 to S9 to obtain the real-time data acquisition results of all the channels, and outputting the real-time data acquisition results of all the channels to external equipment.

Preferably, the working modes of the data acquisition card include a voltage signal acquisition mode, a current signal acquisition mode and a resistance signal acquisition mode;

switching between a sensor signal input channel and a sensor signal input expansion channel through a control channel switch;

corresponding divider resistors are connected through a control resistor type selector switch;

the input mode of the analog-to-digital conversion module is controlled by controlling the signal type switch, the input mode of the analog-to-digital conversion module comprises a single-ended input mode and a differential input mode, when the signal type switch is switched off, the input mode of the analog-to-digital conversion module is the single-ended input mode, and when the signal type switch is switched off, the input mode of the analog-to-digital conversion module is the differential input mode;

switching between different working modes of the data acquisition card by controlling a resistor type switch and a signal type switch;

when the input signal type is a voltage or resistance signal, the data acquisition card acquires the input signal of the mth channel in the method; when the input signal type is a current signal, the data acquisition card acquires the input signals of the m and m +1 th channels in the method, wherein the channels are sensor signal input channels or sensor signal input expansion channels.

Preferably, the operating mode of the data acquisition card is specifically:

when the data acquisition card acquires a voltage signal of an input channel, the data acquisition card works in a voltage signal acquisition mode, the resistance model type switch is switched off, the signal type switch is switched off, and the signal input mode of the analog-to-digital conversion module is a single-ended input mode and occupies a signal input channel of the analog-to-digital conversion module; the positive pole of the input voltage signal is connected with the positive terminal of the nth sensor signal input channel or the sensor signal input expansion channel, the negative pole of the input voltage signal is connected with the negative input end of any sensor signal input channel, wherein n is an odd number and satisfies the condition that n is more than or equal to 1 and less than or equal to m;

when the data acquisition card acquires a current signal of one input channel, the data acquisition card works in a current signal acquisition mode, the resistance model type change-over switch is switched off, the signal type change-over switch is switched on, and the signal input mode of the analog-to-digital conversion module is a differential input mode and occupies two signal input channels of the analog-to-digital conversion module; the positive electrode of the input current signal is connected with the positive terminal of the nth sensor signal input channel or the sensor signal input expansion channel, the negative electrode of the input current signal is connected with the negative terminal of the (n + 1) th sensor signal input channel or the sensor signal input expansion channel, wherein n is an odd number, and n is more than or equal to 1 and less than or equal to m;

when the data acquisition card acquires a resistance signal of an input channel, the data acquisition card works in a resistance signal acquisition mode, the resistance type switch is connected into the corresponding divider resistor, the signal type switch is disconnected, the signal input mode of the analog-to-digital conversion module is a single-end input mode, and one signal input channel of the analog-to-digital conversion module is occupied; the positive pole of the input resistance signal is connected with the positive terminal of any sensor signal input channel or sensor signal input expansion channel, and the negative pole of the input resistance signal is connected with the negative terminal of any sensor signal input channel or sensor signal input expansion channel.

Preferably, in step S1, the initial configuration information of the data acquisition card includes state information of the sensor input interface, acquisition mode information of the data acquisition card, current system time, an alarm threshold, a unit of an acquisition signal, and a data transmission mode.

Compared with the prior art, the technical scheme of the invention has the beneficial effects that:

the invention provides a multi-channel multi-type signal high-speed data acquisition card and a control method thereof, wherein the data acquisition card comprises a signal input module, N signal input expansion modules, a signal type switching module, an analog-to-digital conversion module, an isolation module, a control module, a data transmission module and a power supply module; the output end of the signal input module and the output ends of all the signal input expansion modules are electrically connected with the input end of the signal type switching module in a parallel connection mode; the output end of the signal type switching module is electrically connected with the input end of the analog-to-digital conversion module; the output end of the analog-to-digital conversion module is electrically connected with the input end of the control module through the isolation module; the output end of the control module is connected with the control end of the signal type switching module and is also electrically connected with the input end of the data transmission module, and the data transmission module is connected with external equipment; the power supply module directly supplies power for the signal input module and the signal input expansion module, and supplies power for the signal type switching module, the analog-to-digital conversion module, the control module and the data transmission module through the isolation module;

the invention realizes the acquisition of a large number of multi-channel sensor signals through the channel selector switch, the number of the channels can be flexibly increased or decreased according to application scenes, and the acquisition of various sensors is realized through the resistor type selector switch and the signal type selector switch; the invention can simultaneously collect more signals and also consider signals of various sensors; the control method provided by the invention can also realize flexible control of acquisition card parameters, and the alternate channel switching strategy and the working mode of circulating acquisition improve the reliability of stable and high-speed acquisition.

Drawings

Fig. 1 is a schematic diagram of a multi-channel multi-type signal high-speed data acquisition card provided in embodiment 1.

Fig. 2 is a structural diagram of a multi-channel multi-type signal high-speed data acquisition card according to embodiment 2.

Fig. 3 is a flowchart of steps S2 to S5 of a control method for a multi-channel multi-type signal high-speed data acquisition card according to embodiment 3.

The broken lines in fig. 1 and 2 represent power supply lines, and the solid lines represent data transmission lines; 31-channel selector switch, 32-resistance type selector switch and 34-signal type selector switch.

Detailed Description

The drawings are for illustrative purposes only and are not to be construed as limiting the patent;

for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;

it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.

Example 1

As shown in fig. 1, the present embodiment provides a multi-channel multi-type signal high-speed data acquisition card, which includes a signal input module 1, N signal input expansion modules 2, a signal type switching module 3, an analog-to-digital conversion module 4, an isolation module 5, a control module 6, a data transmission module 7, and a power supply module 8;

the output end of the signal input module 1 and the output ends of all the signal input expansion modules 2 are electrically connected with the input end of the signal type switching module 3 in a parallel connection mode;

the output end of the signal type switching module 3 is electrically connected with the input end of the analog-to-digital conversion module 4;

the output end of the analog-to-digital conversion module 4 is electrically connected with the input end of the control module 6 through the isolation module 5;

the output end of the control module 6 is connected with the control end of the signal type switching module 3, the output end of the control module 6 is electrically connected with the input end of the data transmission module 7, and the data transmission module 7 is connected with external equipment;

the power supply module 8 directly supplies power to the signal input module 1 and the signal input expansion module 2, and supplies power to the signal type switching module 3, the analog-to-digital conversion module 4, the control module 6 and the data transmission module 7 through the isolation module 5.

In the specific implementation process, the power supply module 8 is powered on and starts up, and respectively supplies power to the signal input module 1, the signal input expansion module 2, the signal type switching module 3, the analog-to-digital conversion module 4, the isolation module 5, the control module 6 and the data transmission module 7; signals of the sensor are input into the data acquisition card from the signal input module 1 and the signal input extension module 2, the data acquisition card starts to acquire data from a first sensor signal input channel, and all the sensor signal input channels and the sensor signal input extension channels are sequentially and circularly acquired;

in the process of collecting data by the data collection card, the control module 6 switches different sensor signal input channels and sensor signal input extension channels by controlling the signal type switching module 3;

the data acquisition card inputs the acquired sensor signal data of all the input channels and the expansion channels into the analog-to-digital conversion module 4, and converts analog signals into digital signals;

then, the digital signal is input into the control module 6 through the isolation module 5, and the isolation module 5 can enable the signal acquired by the data acquisition card to be more stable and reliable;

the control module 6 analyzes and processes the input digital signals, and sends the processing result to the data transmission module 7, and the data transmission module 7 transmits the final signal processing structure to external equipment to finish high-speed data acquisition of the data acquisition card;

the high-speed data acquisition card that this embodiment provided realizes the collection of a large amount of sensor signals of multichannel through the channel change over switch to channel quantity can be according to the nimble increase and decrease of application scene, realizes the collection of polymorphic type sensor through resistance model change over switch and signal type change over switch, can gather more quantity simultaneously and compromise the signal of polymorphic type sensor again, and data is also more reliable and more stable.

Example 2

The embodiment provides a multi-channel multi-type signal high-speed data acquisition card, which comprises a signal input module 1, N signal input extension modules 2, a signal type switching module 3, an analog-to-digital conversion module 4, an isolation module 5, a control module 6, a data transmission module 7 and a power supply module 8;

the power supply module 8 directly supplies power to the signal input module 1 and the signal input expansion module 2, and supplies power to the signal type switching module 3, the analog-to-digital conversion module 4, the control module 6 and the data transmission module 7 through the isolation module 5;

the signal input module 1 comprises M sensor signal input channels 11, each signal input expansion module 2 comprises M sensor signal input expansion channels 21, the sensor signal input expansion channels 21 correspond to the sensor signal input channels 11 one by one, and M is an even number;

each of the sensor signal input channels 11 and each of the sensor signal input extension channels 21 includes a positive terminal and a negative terminal; the positive terminal of each sensor signal input channel 11 and the positive terminal of each sensor signal input extension channel 21 are electrically connected with the input end of the signal type switching module 3 in parallel, and the negative terminal of each sensor signal input channel 11 and the negative terminal of each sensor signal input extension channel 21 are grounded;

the signal type switching module 3 comprises P channel switches 31, P resistor type switches 32, a filter circuit unit 33, Q signal type switches 34, a plurality of divider resistors 35 and a plurality of sampling resistors 36, wherein P and Q satisfy that P is greater than or equal to M and Q = P/2;

each of the channel switch 31 and the resistance type switch 32 is a single-pole multi-throw switch, and includes a plurality of input terminals, an output terminal, and a control terminal;

each of the signal type switches 34 is a single-pole double-throw switch, and includes an input terminal, two output terminals, and a control terminal;

the filter circuit unit 33 includes P input terminals and P output terminals;

one input end of each channel switch 31 is electrically connected with the positive terminal of one sensor signal input channel 11 correspondingly, and the remaining input ends of the channel switches 31 are electrically connected with the positive terminal of one sensor signal input expansion channel 21 correspondingly; the output end of each channel switch 31 is electrically connected with one input end of the filter circuit unit 33 correspondingly, and the control end of each channel switch 31 is electrically connected with the control module 6; each output end of the filter circuit unit 33 is electrically connected with the input end of the analog-to-digital conversion module 4;

different input ends of one resistor type switch 32 are correspondingly and electrically connected with the output end of one channel switch 31 through different types of divider resistors 35, the output end of each resistor type switch 32 is electrically connected with the power supply module 8 through the isolation module 5, and the control end of each resistor type switch 32 is electrically connected with the control module 6;

any output end of each signal type switch 34 is connected in series with a sampling resistor 36 and then correspondingly connected in parallel between every two output ends of the filter circuit unit 33, and the control end of each signal type switch 34 is electrically connected with the control module 6;

the control module 6 comprises an MCU main controller 61 and an isolation controller 62;

the output end of the MCU main controller 61 is connected to the control end of each channel switch 31, the control end of each resistance type switch 32 and the control end of each signal type switch 34 through an isolation controller 62;

the MCU main controller 61 is electrically connected with the analog-to-digital conversion module 4 and the data transmission module 7 through the isolation module 5;

the isolation module 5 comprises an isolation power supply 51 and an isolation communication unit 52;

the power supply unit 8 supplies power to each resistor model type switch 32, the analog-to-digital conversion module 4, the isolation communication unit 52 and the isolation controller 62 through an isolation power supply 51;

the MCU main controller 61 is electrically connected with the analog-to-digital conversion module 4 and the data transmission module 7 through the isolation communication unit 52;

the control module 6 further comprises an expansion device 63 electrically connected with the MCU main controller 61, wherein the expansion device 63 comprises at least one of an external display screen, a buzzer, a knob, a key, a rocker, an indicator light and a loudspeaker.

In a specific implementation process, as shown in fig. 2, a signal input module 1 in the data acquisition card in this embodiment includes 8 sensor signal input channels 11, the data acquisition card includes a signal input extension module 2, the signal input extension module 2 includes 8 sensor signal input extension channels 21, and each sensor signal input extension channel 21 corresponds to one sensor signal input channel 11;

in fig. 2, CH1 to CH8 represent 8 sensor signal input channels 11, and ch9 to CH16 represent 8 sensor signal input extension channels 21;

the signal type switching module 3 comprises 8 channel switches 31, 8 resistor type switches 32, a filter circuit unit 33, 4 signal type switches 34, a plurality of divider resistors 35 and 4 sampling resistors 36;

the positive terminal of the 8 sensor signal input channels 11 is connected with one input end of the 8 channel selector switches 31, and the positive terminal of the 8 sensor signal input extension channels 21 is connected with the other input end of the 8 channel selector switches 31;

the data acquisition card realizes the switching of the sensor signal input channel 11 and the sensor signal input extension channel 21 through the channel switching switch 31, thereby acquiring sensor signals of a plurality of channels simultaneously;

different input ends of one resistor type switch 32 are correspondingly and electrically connected with the output end of each channel switch 31 through voltage dividing resistors 35 of different types, the output end of the resistor type switch 32 is electrically connected with the power supply module 8 through the isolation module 5, and the 8 resistor type switches 32 can play a role in voltage division;

the output ends of the filter circuit units 33 are electrically connected with the analog-to-digital conversion module 4, each signal type switch 34 and the sampling resistor 36 are connected in parallel between the output ends of every two filter circuit units 33, and the filter circuit 33 can remove noise waves in sensor input signals and improve the accuracy of data acquisition;

the data acquisition card realizes the switching of the acquisition of different types of signals through the resistor type selector switch 32 and the signal type selector switch 34, thereby acquiring multiple types of sensor signals and improving the data acquisition compatibility of the data acquisition card;

the power supply unit 8 provides a voltage reference for the analog-to-digital conversion module 4 through the isolation power supply 51;

the analog-to-digital conversion module 4 and the MCU main controller 61 transmit data through the isolation communication unit 52, and the isolation communication unit 52 enables data transmission to be more stable and reliable;

the MCU main controller 61 analyzes and processes the input digital signals, sends the processing result to the data transmission module 7, and the data transmission module 7 transmits the final signal processing structure to external equipment to finish the high-speed data acquisition of the data acquisition card;

in this embodiment, the isolation module 5 further includes a second isolation power supply 53 and a second isolation communication unit 54, the data transmission module 7 includes a 485 chip and a communication interface, a serial chip and a communication interface, and a network chip and a communication interface, where the 485 chip, the serial chip and the network chip are respectively connected to the MCU main controller, and in order to improve stability of data transmission, the network chip is further electrically connected to the power supply module 8 through the second isolation power supply 53, the network chip communicates with the MCU main controller 61 through the second isolation communication unit 54, and the data transmission module 7 transmits data acquired by the data acquisition card to an external device through each chip and its corresponding interface;

in this embodiment, the MCU master controller 61 is further connected to an expansion device 63, and the expansion device 63 includes an external display screen and a key, so that the data acquisition card can be used and controlled more conveniently;

Example 3

The present embodiment provides a control method for a multi-channel multi-type signal high-speed data acquisition card, which is based on the multi-channel multi-type signal high-speed data acquisition card described in embodiment 1 or 2, and includes the following steps:

s1: acquiring initial configuration information of a data acquisition card;

s2: acquiring input signals of the mth or (m + 1) th sensor signal input channel by using a corresponding working mode of the data acquisition card according to initial configuration information of the data acquisition card, wherein m is an odd number;

s4: configuring a corresponding mth or mth and m +1 resistance model change-over switch and a mth signal type change-over switch according to the input signal type of the mth sensor signal input expansion channel;

s5: repeating the steps S2-S4 from the first sensor signal input channel, and sequentially acquiring input signals of all sensor signal input channels to obtain a data acquisition result of the native channel;

s10: repeating the steps S2-S9, obtaining real-time data acquisition results of all channels, and outputting the real-time data acquisition results of all channels to external equipment;

the working modes of the data acquisition card comprise a voltage signal acquisition mode, a current signal acquisition mode and a resistance signal acquisition mode;

switching between the sensor signal input channel and the sensor signal input extension channel is performed by controlling the channel switching switch 31;

the corresponding voltage dividing resistor 35 is connected through the control resistor model switch 32;

the input mode of the analog-to-digital conversion module 4 is controlled by controlling the signal type switch 34, the input mode of the analog-to-digital conversion module 4 includes a single-ended input mode and a differential input mode, when the signal type switch 34 is turned off, the input mode of the analog-to-digital conversion module 4 is the single-ended input mode, and when the signal type switch 34 is turned on, the input mode of the analog-to-digital conversion module 4 is the differential input mode;

the switching between different working modes of the data acquisition card is carried out by controlling the resistor model type switch 32 and the signal type switch 34;

when the input signal type is a voltage or resistance signal, the data acquisition card acquires the input signal of the mth channel in the method; when the input signal type is a current signal, the data acquisition card acquires input signals of m and m +1 channels in the method, wherein the channels are sensor signal input channels or sensor signal input expansion channels;

the working mode of the data acquisition card is as follows:

when the data acquisition card acquires a voltage signal of an input channel, the data acquisition card works in a voltage signal acquisition mode, the resistance model switch 32 is switched off, the signal type switch 34 is switched off, and the signal input mode of the analog-to-digital conversion module 4 is a single-ended input mode and occupies a signal input channel of the analog-to-digital conversion module 4; the positive pole of the input voltage signal is connected with the positive terminal of the nth sensor signal input channel or the sensor signal input expansion channel, the negative pole of the input voltage signal is connected with the negative input end of any sensor signal input channel, wherein n is an odd number and satisfies the condition that n is more than or equal to 1 and less than or equal to m;

when the data acquisition card acquires a current signal of an input channel, the data acquisition card works in a current signal acquisition mode, the resistance model type switch 32 is switched off, the signal type switch 34 is switched on, the signal input mode of the analog-to-digital conversion module 4 is a differential input mode, and two signal input channels of the analog-to-digital conversion module 4 are occupied; the positive pole of the input current signal is connected with the positive terminal of the nth sensor signal input channel or the sensor signal input expansion channel, the negative pole of the input current signal is connected with the negative terminal of the (n + 1) th sensor signal input channel or the sensor signal input expansion channel, wherein n is an odd number, and n is more than or equal to 1 and less than or equal to m;

when the data acquisition card acquires a resistance signal of an input channel, the data acquisition card works in a resistance signal acquisition mode, the resistance model switch 32 is connected to the corresponding divider resistor 35, the signal type switch 34 is disconnected, the signal input mode of the analog-to-digital conversion module 4 is a single-end input mode, and one signal input channel of the analog-to-digital conversion module 4 is occupied; the positive pole of the input resistance signal is connected with the positive terminal of any sensor signal input channel or sensor signal input expansion channel, and the negative pole of the input resistance signal is connected with the negative terminal of any sensor signal input channel or sensor signal input expansion channel.

In a specific implementation process, this embodiment takes the high-speed data acquisition card shown in fig. 2 as an example, and introduces a control method for a multi-channel multi-type signal high-speed data acquisition card;

firstly, powering on and starting up a data acquisition card to acquire initial configuration information of the data acquisition card;

the data acquisition card acquires and displays state information of a sensor input interface, acquisition mode information of the data acquisition card, current system time, an alarm threshold value, a unit for acquiring a signal and a data transmission mode;

the initial configuration information of the data acquisition card can be manually set, and if the initial configuration information is not manually set, the initial configuration information of the data acquisition card in the last working time is used in the working process;

according to the initial configuration information of the data acquisition card, starting to acquire data from a first sensor signal input channel by using a corresponding working mode of the data acquisition card;

when voltage or resistance data are collected, only one sensor signal input channel or expansion channel is needed, but when current data are collected, two adjacent sensor signal input channels or expansion channels are needed to be used as current signal input together, and two sensor signal input channels or expansion channels need to be occupied simultaneously;

in this embodiment, all input channels or extension channels of the data acquisition card may be used as input of voltage or resistance signals, or as input of current signals, and any odd-numbered channel and next channel may be changed into a current channel through the signal type switch 34 and the resistance type switch 32 to be used as input current signals;

in this embodiment, the working process of the data acquisition card is described by using the m +1 th and m +1 th sensor signal input channels as a group, and as shown in fig. 3, the steps S2 to S5 in the method specifically include:

assuming that the input of the mth sensor signal input channel is a voltage or resistance signal, the data acquisition card switches to a voltage or resistance signal acquisition mode to acquire the data of the channel, and after the data acquisition of the channel is completed, if the voltage or resistance signal needs to be acquired in the mth sensor signal input extension channel, the data acquisition card immediately switches the channel switch 31 corresponding to the mth sensor signal input channel to the mth sensor signal input extension channel, configures the signal type switch 34 and the resistance type switch 32 corresponding to the voltage or resistance working mode, acquires the signal of the m +1 sensor signal input channel after the configuration is completed, and after the input signal of the m +1 sensor signal input channel is acquired, switches the m +1 channel switch to the m +1 sensor signal input extension channel, configures the m +1 resistance type switch 32, and then acquires the m +2 sensor signal input channel by using a similar method;

if the mth sensor signal input expansion channel has a current signal to be acquired, acquiring a voltage or resistance signal of an m +1 th sensor signal input channel, then switching a channel switch 31 corresponding to the mth sensor signal input channel and the m +1 th sensor signal input expansion channel to the mth sensor signal input expansion channel and switching on an mth signal type switch 34 and switching off an m +1 th resistance type switch 32 by using a data acquisition card respectively, and continuously acquiring an m +2 th sensor signal input channel after the configuration of the switches is completed;

assuming that the input of the mth and (m + 1) th sensor signal input channels is current signals, after the current signals are acquired, if the voltage or resistance signals of the mth sensor signal input expansion channel need to be acquired, the data acquisition card disconnects the mth signal type switch 34, switches the channel switch 31 corresponding to the mth sensor signal input channel to the mth sensor signal input expansion channel, configures the mth resistance type switch 32 corresponding to the voltage or resistance working mode, switches the channel switch 31 corresponding to the (m + 1) th sensor signal input channel to the (m + 1) th sensor signal input expansion channel, configures the (m + 1) th resistance type switch 32 corresponding to the voltage or resistance working mode, and continues to acquire the (m + 2) th sensor signal input channel after the configuration of the switches is completed;

if the current signal needs to be acquired in the mth sensor signal input expansion channel, the channel selector switch 31 corresponding to the mth and (m + 1) th sensor signal input channels is respectively switched to the mth and (m + 1) th sensor signal input expansion channels, the mth signal type selector switch 34 is kept closed, the (m, m + 1) th resistance type selector switch 32 is switched off, and the (m + 2) th sensor signal input channel is continuously acquired after the configuration of the switch is completed;

the data acquisition of all sensor signal input channels can be realized by continuously acquiring the data in the same logic, and the data acquisition result of the native channel is obtained;

when a sensor signal input channel is acquired, the corresponding channel change-over switch 31 is immediately switched to a sensor signal input expansion channel, the corresponding resistor type change-over switch 32 and the signal type change-over switch 34 are configured, and the next sensor signal input channel is continuously acquired after the switch configuration is finished;

when the signal acquisition of 8 sensor signal input channels is finished, acquiring signals of 8 sensor signal input extension channels according to the steps S6-S9, wherein similar to the process, when one sensor signal input extension channel is acquired, the corresponding channel selector switch 31 is immediately switched back to the sensor signal input channel, the corresponding resistor type selector switch 32 and the corresponding signal type selector switch 34 are reconfigured, the next sensor signal input extension channel is continuously acquired after the switch reconfiguration is finished, and after the 8 sensor signal input extension channels are completely acquired, the data acquisition result of the extension channel is obtained;

taking the data acquisition results of the native channels and the data acquisition results of the extended channels as the data acquisition results of all the channels;

repeating the steps for cyclic acquisition to obtain real-time data acquisition results of all channels, and directly skipping a channel which is not accessed with the sensor signal according to configuration information during data acquisition;

in this embodiment, m is an odd number, if m channel is a voltage/resistance signal or a turn-off channel, m +1 channel can only be a voltage/resistance signal or a turn-off channel, if m channel is a current signal, m +1 channel can only be combined with m channel into one current channel;

after the data acquisition is finished, the data transmission module 7 outputs the real-time data acquisition results of all channels to external equipment, if no external equipment is connected, the data acquisition card stores alarm information, and the alarm information is output after the connection is successful;

the invention realizes the acquisition of a large number of multi-channel sensor signals through the channel selector switch, the number of the channels can be flexibly increased or decreased according to application scenes, and the acquisition of various sensors is realized through the resistor type selector switch and the signal type selector switch; the invention can simultaneously collect more signals and also consider signals of various sensors; the control method provided by the invention can also realize flexible control on acquisition card parameters, and the alternate channel switching strategy and the working mode of cyclic acquisition improve the reliability of stable high-speed acquisition.

The same or similar reference numerals correspond to the same or similar parts;

the terms describing positional relationships in the drawings are for illustrative purposes only and should not be construed as limiting the patent;

it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A multi-channel multi-type signal high-speed data acquisition card is characterized by comprising a signal input module (1), N signal input expansion modules (2), a signal type switching module (3), an analog-to-digital conversion module (4), an isolation module (5), a control module (6), a data transmission module (7) and a power supply module (8);

the output end of the signal input module (1) and the output ends of all the signal input expansion modules (2) are electrically connected with the input end of the signal type switching module (3) in a parallel connection mode;

the output end of the signal type switching module (3) is electrically connected with the input end of the analog-to-digital conversion module (4);

the output end of the analog-to-digital conversion module (4) is electrically connected with the input end of the control module (6) through the isolation module (5);

the output end of the control module (6) is connected with the control end of the signal type switching module (3), the output end of the control module (6) is electrically connected with the input end of the data transmission module (7), and the data transmission module (7) is connected with external equipment;

the power supply module (8) directly supplies power for the signal input module (1) and the signal input expansion module (2), and supplies power for the signal type switching module (3), the analog-to-digital conversion module (4), the control module (6) and the data transmission module (7) through the isolation module (5).

2. A multi-channel, multi-type signal high speed data acquisition card according to claim 1, wherein said signal input module (1) comprises M sensor signal input channels (11), each of said signal input expansion modules (2) comprises M sensor signal input expansion channels (21), the sensor signal input expansion channels (21) are in one-to-one correspondence with the sensor signal input channels (11), and M is an even number;

each of the sensor signal input channels (11) and each of the sensor signal input extension channels (21) includes a positive terminal and a negative terminal; the positive terminal of each sensor signal input channel (11) and the positive terminal of each sensor signal input extension channel (21) are electrically connected in parallel with the input terminal of the signal type switching module (3), and the negative terminal of each sensor signal input channel (11) and the negative terminal of each sensor signal input extension channel (21) are grounded.

3. The multi-channel multi-type signal high-speed data acquisition card according to claim 2, wherein the signal type switching module (3) comprises P channel switches (31), P resistor type switches (32), a filter circuit unit (33), Q signal type switches (34), a plurality of divider resistors (35) and a plurality of sampling resistors (36), and P and Q satisfy that P is greater than or equal to M, and Q = P/2;

each channel change-over switch (31) and each resistance model change-over switch (32) are single-pole multi-throw switches and comprise a plurality of input ends, an output end and a control end;

each signal type change-over switch (34) is a single-pole double-throw switch and comprises an input end, two output ends and a control end;

the filter circuit unit (33) comprises P input ends and P output ends;

one input end of each channel switch (31) is correspondingly and electrically connected with a positive wiring end of one sensor signal input channel (11), and the rest input ends of the channel switches (31) are correspondingly and electrically connected with a positive wiring end of one sensor signal input extension channel (21); the output end of each channel switch (31) is correspondingly and electrically connected with one input end of the filter circuit unit (33), and the control end of each channel switch (31) is electrically connected with the control module (6); each output end of the filter circuit unit (33) is electrically connected with the input end of the analog-to-digital conversion module (4);

different input ends of one resistor type change-over switch (32) are correspondingly and electrically connected with the output end of one channel change-over switch (31) through voltage-dividing resistors (35) of different types, the output end of each resistor type change-over switch (32) is electrically connected with a power supply module (8) through an isolation module (5), and the control end of each resistor type change-over switch (32) is electrically connected with a control module (6);

any output end of each signal type switch (34) is connected with a sampling resistor (36) in series and then correspondingly connected in parallel between every two output ends of the filter circuit unit (33), and the control end of each signal type switch (34) is electrically connected with the control module (6).

4. A multi-channel, multi-type signal high speed data acquisition card according to claim 3, characterized in that said control module (6) comprises a MCU master controller (61) and an isolation controller (62);

the output end of the MCU main controller (61) is connected with the control end of each channel selector switch (31), the control end of each resistor type selector switch (32) and the control end of each signal type selector switch (34) through an isolation controller (62);

the MCU main controller (61) is electrically connected with the analog-to-digital conversion module (4) and the data transmission module (7) through the isolation module (5).

5. A multi-channel, multi-type signal high speed data acquisition card according to claim 4, characterized in that said isolation module (5) comprises an isolation power supply (51) and an isolation communication unit (52);

the power supply unit (8) supplies power to each resistor type selector switch (32), the analog-to-digital conversion module (4), the isolation communication unit (52) and the isolation controller (62) through an isolation power supply (51);

the MCU main controller (61) is electrically connected with the analog-to-digital conversion module (4) and the data transmission module (7) through the isolation communication unit (52).

6. The multi-channel multi-type signal high-speed data acquisition card according to claim 5, wherein the control module (6) further comprises an expansion device (63) electrically connected with the MCU main controller (61), and the expansion device (63) comprises at least one of an external display screen, a buzzer, a knob, a key, a rocker, an indicator light and a loudspeaker.

7. A control method of a multi-channel multi-type signal high-speed data acquisition card based on any one of claims 1 to 6, characterized by comprising the following steps:

s1: acquiring initial configuration information of a data acquisition card;

s8: reconfiguring a corresponding mth or mth and m +1 resistance model change-over switch and a mth signal type change-over switch according to the input signal type of the mth sensor signal input channel;

s9: repeating the steps S6-S8 from the input of the first sensor signal into the expansion channel, sequentially acquiring input signals of all the sensor signals into the expansion channel to obtain a data acquisition result of the expansion channel, and taking the data acquisition result of the original channel and the data acquisition result of the expansion channel as the data acquisition results of all the channels;

8. The method according to claim 7, wherein the operation modes of said data acquisition card include a voltage signal acquisition mode, a current signal acquisition mode and a resistance signal acquisition mode;

switching between a sensor signal input channel and a sensor signal input expansion channel is performed by controlling a channel switching switch (31);

corresponding voltage dividing resistors (35) are connected in by controlling a resistor type selector switch (32);

the input mode of the analog-to-digital conversion module (4) is controlled by controlling the signal type switch (34), the input mode of the analog-to-digital conversion module (4) comprises a single-ended input mode and a differential input mode, when the signal type switch (34) is switched off, the input mode of the analog-to-digital conversion module (4) is the single-ended input mode, and when the signal type switch (34) is switched on, the input mode of the analog-to-digital conversion module (4) is the differential input mode;

switching between different working modes of the data acquisition card is carried out by controlling a resistor type switch (32) and a signal type switch (34);

9. The method according to claim 8, wherein the operating mode of the data acquisition card is specifically:

when the data acquisition card acquires a voltage signal of an input channel, the data acquisition card works in a voltage signal acquisition mode, the resistance model type switch (32) is switched off, the signal type switch (34) is switched off, and the signal input mode of the analog-to-digital conversion module (4) is a single-ended input mode and occupies a signal input channel of the analog-to-digital conversion module (4); the positive pole of the input voltage signal is connected with the positive terminal of the nth sensor signal input channel or the sensor signal input expansion channel, the negative pole of the input voltage signal is connected with the negative input end of any sensor signal input channel, wherein n is an odd number, and n is more than or equal to 1 and less than or equal to m;

when the data acquisition card acquires a current signal of an input channel, the data acquisition card works in a current signal acquisition mode, the resistance model type switch (32) is switched off, the signal type switch (34) is switched on, the signal input mode of the analog-to-digital conversion module (4) is a differential input mode, and two signal input channels of the analog-to-digital conversion module (4) are occupied; the positive pole of the input current signal is connected with the positive terminal of the nth sensor signal input channel or the sensor signal input expansion channel, the negative pole of the input current signal is connected with the negative terminal of the (n + 1) th sensor signal input channel or the sensor signal input expansion channel, wherein n is an odd number, and n is more than or equal to 1 and less than or equal to m;

when the data acquisition card acquires a resistance signal of an input channel, the data acquisition card works in a resistance signal acquisition mode, the resistance model selector switch (32) is connected to the corresponding divider resistor (35), the signal type selector switch (34) is disconnected, the signal input mode of the analog-to-digital conversion module (4) is a single-end input mode, and one signal input channel of the analog-to-digital conversion module (4) is occupied; the positive pole of the input resistance signal is connected with the positive terminal of any sensor signal input channel or sensor signal input expansion channel, and the negative pole of the input resistance signal is connected with the negative terminal of any sensor signal input channel or sensor signal input expansion channel.

10. The method according to claim 9, wherein in step S1, the initial configuration information of the data acquisition card comprises sensor input interface status information, acquisition mode information of the data acquisition card, current system time, alarm threshold, unit of signal acquisition and data transmission mode.