CN113225140B - Analog quantity twin signal receiver for remote anti-electromagnetic interference transmission of analog quantity signal - Google Patents
Analog quantity twin signal receiver for remote anti-electromagnetic interference transmission of analog quantity signal Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
An analog quantity twin signal receiver for remote anti-electromagnetic interference transmission of an analog quantity signal comprises a twin channel input module, a first signal preprocessing module, a first AD conversion module, a first twin channel signal processing module, a first DA conversion module, a first control module, a first dial module, a first signal output processing module and an output channel module. The signal receiver of the invention collects complementary twin signals, eliminates external electromagnetic interference by using a difference method, accurately outputs and restores analog quantity signals to be transmitted, and realizes accurate remote transmission of the analog quantity signals. The analog quantity voltage and current signal acquisition device is suitable for acquiring the conventional analog quantity voltage and current signals with continuously changing specifications such as 4-20 mA or 0-20 mA current signals or 0-5V voltage signals.
Description
Technical Field
The invention relates to a signal receiver, in particular to an analog quantity twin signal receiver for remote anti-electromagnetic interference transmission of an analog quantity signal.
Background
The remote transmission of analog signals generally adopts two modes of communication and hard wiring. Under the communication mode, if network congestion occurs in a communication line, packet loss is easy to occur, the transmission quality of analog quantity signals is seriously influenced, the requirements of real-time performance, accuracy and reliability cannot be met, and common communication quantity analog quantity signals are not applied to field device control. Under the ordinary hard-wired mode, the remote transmission of analog quantity signals is easily influenced by electromagnetic interference of the surrounding environment, and particularly when strong electromagnetic field interference sources such as motors exist around, the remote transmission of analog quantity signals is easily distorted and generates a jump phenomenon. At present, a copper metal core cable is widely adopted to realize remote transmission of analog quantity signals. However, the method has the following defects that the analog quantity signal is easily influenced by electromagnetic interference of the surrounding environment in long-distance transmission, so that the transmitted analog quantity signal is easily distorted and jumps.
Disclosure of Invention
The invention aims to solve the problems that in the application occasions of field device control, state monitoring and the like, remote transmission of analog quantity signals is easily influenced by electromagnetic interference of the surrounding environment in a common hard wiring mode, and particularly, when strong electromagnetic field interference sources such as motors exist around, the remote transmission analog quantity signals are easily distorted and generate a jump phenomenon. The receiver collects complementary twin signals, eliminates external electromagnetic interference by using a difference method, accurately outputs and restores the analog quantity signals to be transmitted, and realizes accurate remote transmission of the analog quantity signals.
The technical scheme adopted by the invention is as follows:
an analog twin signal receiver for long-range electromagnetic interference immunity transmission of an analog signal, comprising:
the device comprises a twin channel input module, a first signal preprocessing module, a first AD conversion module, a first twin channel signal processing module, a first DA conversion module, a first control module, a first dial module, a first signal output processing module and an output channel module;
the twin channel input module is used for acquiring n pairs of complementary twin signals X1, Y1, X2, Y2, X3, Y3 … … Xn and Yn input from the outside, and outputting n pairs of twin signals X1, Y1, X2, Y2, X3, Y3 … … Xn and Yn to the first signal preprocessing module;
the first signal preprocessing module is used for acquiring n pairs of twin signals X1, Y1, X2, Y2, X3, Y3 … … Xn and Yn output by the twin channel input module, performing preprocessing isolation amplification filtering processing, and then outputting n pairs of twin signals AX1, AY1, AX2, AY2, AX3, AY3 … … AXn and AYn to the first AD conversion module;
the first AD conversion module is used for acquiring n pairs of twin signals AX1, AY1, AX2, AY2, AX3, AY3 … … AXn and AYn output by the first signal preprocessing module, performing analog-to-digital conversion processing according to channel specification signals S1, S2 and S3 … … Sn output by the first code dialing module, and then outputting n pairs of twin signals DX1, DY1, DX2, DY2, DX3, DY3 … … DXn and DYn to the first twin channel signal processing module;
the first twin channel signal processing module collects n pairs of twin signals DX1, DY1, DX2, DY2, DX3, DY3 … … DXn and DYn output by the first AD conversion module, carries out twin channel signal processing according to channel specification signals S1, S2 and S3 … … Sn output by the first code dialing module, and then outputs n signals DXY1, DXY2 and DXY3 … … DXYn to the first DA conversion module.
The first DA conversion module is used for acquiring n channel signals DXY1, DXY2 and DXY3 … … DXYn output by the first twin channel signal processing module, performing digital-to-analog conversion processing according to channel specification signals S1, S2 and S3 … … Sn output by the first code dialing module, and then outputting n channel signals AXY1, AXY2 and AXY3 … … AXYn to the first signal output processing module;
the first signal output processing module is used for acquiring n channel signals AXY1, AXY2 and AXY3 … … AXYn output by the first DA conversion module, performing isolation amplification processing, and outputting n channel signals XY1, XY2 and XY3 … … XYn to the output channel module;
the output channel module collects n channel signals XY1, XY2 and XY3 … … XYn output by the first signal output processing module, performs isolation amplification processing, and outputs n channel signals XY1, XY2 and XY3 … … XYn;
the device comprises a first control module, a first signal preprocessing module, an AD first conversion module, a first twin channel signal processing module, a first DA conversion module, a first signal output processing module, an output channel module and a first control module, wherein the first control module is used for controlling a data acquisition and processing process.
The receiver also comprises a first power supply module, wherein the power supply module is a twin channel input module, a first signal preprocessing module, a first AD conversion module, a first twin channel signal processing module, a first DA conversion module, a first control module, a first dial module, a first signal output processing module and an output channel module which provide power.
The twin channel input module comprises n pairs of twin channels, each pair of twin channels comprising 2 signal acquisition input channel units.
In the twin channel input module, n pairs of complementary twin signals have the following meanings:
for 4-20 mA analog quantity signals, the two complementary twin analog quantity signals mean that the two analog quantity signals are added to be 24 mA;
for 0-20 mA analog quantity signals, the two complementary twin analog quantity signals mean that the two analog quantity signals are added to be 20 mA;
for 0-5V analog quantity signals, the two complementary twin analog quantity signals mean that the two analog quantity signals are added to be 5V. The first dial module outputs channel specification signals S1, S2 and S3 … … Sn to the first AD conversion module, the first twin channel signal processing module and the first DA conversion module according to the dial setting of a user and a dial rule output method, wherein Sn is the channel specification signal of the twin channel n of the twin channel input module.
The dialing number of the first dialing module is consistent with the number of twin channels contained in the twin channel input module, the number of the first dialing module is n, the numbers are respectively '1', '2', '3' … … 'n', the dialing number of the 'n' number is correspondingly provided with the analog quantity signal specification collected by the twin channel n of the twin channel input module, and each dialing module has 3 positions of '1', '2' and '3':
if the analog quantity signal specification collected by the twin channel n of the twin channel input module is 4-20 mA analog quantity signal, the user sets the dial corresponding to the twin channel n to be 1;
if the analog quantity signal specification collected by the twin channel n of the twin channel input module is 0-20 mA analog quantity signal, the user sets the dial corresponding to the twin channel n to be 2;
and if the analog quantity signal specification collected by the twin channel n of the twin channel input module is 0-5V analog quantity signal, setting the dial corresponding to the twin channel n to be 3 by the user.
The invention relates to an analog twin signal receiver for remote anti-electromagnetic interference transmission of an analog signal, which has the following technical effects:
1) the invention relates to an analog quantity twinborn signal receiver for remote anti-electromagnetic interference transmission of an analog quantity signal, which is matched with an analog quantity twinborn signal converter for remote anti-electromagnetic interference transmission of the analog quantity signal for remote transmission of the analog quantity signal, so that the remote transmission of the analog quantity signal is carried out, the influence of the electromagnetic interference signal in the transmission process of the analog quantity signal can be obviously eliminated, the distortion and jumping of the transmitted analog quantity signal are avoided, and the remote accurate transmission of the analog quantity signal is ensured.
2) The analog twin signal receiver is matched with an analog twin signal converter for remote anti-electromagnetic interference transmission of analog signals, one or more pairs of complementary twin signals are collected, external electromagnetic interference is eliminated by adopting a difference method, the analog signals needing to be transmitted are accurately output and restored, remote and accurate transmission of the analog signals is realized, and the analog twin signal receiver is not influenced by electromagnetic interference of the surrounding environment.
3) The analog twin signal receiver is suitable for collecting conventional analog voltage and current signals with continuously changing specifications such as 4-20 mA or 0-20 mA current signals or 0-5V voltage signals.
Drawings
FIG. 1 is a schematic diagram of an analog twin signal receiver according to the present invention.
Fig. 2 is a flow chart of the analog-to-digital conversion processing method of the AD conversion module 3 of the receiver of the present invention.
Fig. 3 is a flow chart of a twin channel signal processing method of the twin channel signal processing module 4 of the receiver of the present invention.
Fig. 4 is a flow chart of the analog-to-digital conversion processing method of the DA conversion module 5 of the receiver of the present invention.
Fig. 5 is a diagram of a dial man-machine interaction panel style of the dial module 8 of the receiver of the present invention.
Fig. 6 is a flow chart of a dialing rule output method of the dialing module 8 of the receiver of the present invention.
FIG. 7 is a schematic structural view of example 1 of the present invention;
wherein: 11-liquid level sensor, D-an analog quantity twin signal converter for remote anti-electromagnetic interference transmission of analog quantity signals, 12-oil tank, 13-signal transmission cable, A-an analog quantity twin signal receiver for remote anti-electromagnetic interference transmission of analog quantity signals, 14-liquid level electronic display meter, C-plane-certain oil level of the oil tank within the range of the liquid level transmitter, f 1-hydraulic system oil tank liquid level signal, f 2-complementary twin rotating speed signal of the hydraulic system oil tank liquid level signal f1, M-motor, delta-motor and other strong electromagnetic field interference source released electromagnetic interference signals.
Fig. 8 is a schematic structural diagram of an analog twin signal converter D for remote anti-electromagnetic interference transmission of an analog signal.
Detailed Description
An analog quantity twin signal receiver for remote anti-electromagnetic interference transmission of an analog quantity signal comprises a twin channel input module 1, a first signal preprocessing module 2, a first AD conversion module 3, a first twin channel signal processing module 4, a first DA conversion module 5, a first control module 6, a first power module 7, a first dial module 8, a first signal output processing module 9 and an output channel module 10. The structure of the device is schematically shown in figure 1.
The twin channel input module 1 comprises n pairs of twin channels, each pair of twin channels comprises 2 twin signal acquisition input channels, the twin signal acquisition input channels acquire n pairs of complementary twin signals (X1, Y1, X2, Y2, X3, Y3 … … Xn, Yn) of an external input analog quantity twin signal receiver, and output n pairs of twin signals (X1, Y1, X2, Y2, X3, Y3 … … Xn, Yn) to the signal preprocessing module 2. The n pairs of complementary twin signals are analog quantity signals which are output after analog quantity signals output by an external sensor for measuring a certain physical quantity are converted by an analog quantity twin signal converter D for remote anti-electromagnetic interference transmission of the analog quantity signals.
For 4-20 mA analog quantity signals, the two complementary twin analog quantity signals mean that the two analog quantity signals are added to be 24 mA; for 0-20 mA analog quantity signals, the two complementary twin analog quantity signals mean that the two analog quantity signals are added to be 20 mA; for 0-5V analog quantity signals, the two complementary twin analog quantity signals mean that the two analog quantity signals are added to be 5V.
The first signal preprocessing module 2 collects n pairs of twin signals (X1, Y1, X2, Y2, X3, Y3 … … Xn, Yn) output by the twin channel input module 1, performs pre-isolation amplification filtering processing, and then outputs n pairs of twin signals (AX1, AY1, AX2, AY2, AX3, AY3 … … AXn, AYn) to the first AD conversion module 3.
The first AD conversion module 3 collects n pairs of twin signals (AX1, AY1, AX2, AY2, AX3, AY3 … … AXn, AYn) output by the first signal preprocessing module 2, performs analog-to-digital conversion processing according to the channel specification signals S1, S2, S3 … … Sn output by the first code dialing module 8, and then outputs n pairs of twin signals (DX1, DY1, DX2, DY2, DX3, DY3 … … DXn, DYn) to the first twin channel signal processing module 4.
The analog-to-digital conversion processing method of the first AD conversion module 3 includes the following steps:
if S1 is 2, AX1 and AY1 are linearly interpolated according to 0mA corresponding to 0 and 20mA corresponding to 32767 to be converted into DX1 and DY 1;
if S1 is 3, AX1 and AY1 are linearly interpolated according to 0V for 0 and 5V for 32767 to DX1 and DY 1. Step 3, if S2 is equal to 1, carrying out linear interpolation on AX2 and AY2 according to 4mA correspondence 6553 and 20mA correspondence 32767 to convert into DX2 and DY 2;
if S2 is equal to 2, AX2 and AY2 are converted into DX2 and DY2 by linear interpolation according to 0mA corresponding to 0 and 20mA corresponding to 32767;
if S2 is equal to 3, AX2 and AY2 are linearly interpolated according to 0V for 0 and 5V for 32767 to DX2 and DY 2. Step 4, if S3 is equal to 1, carrying out linear interpolation on AX3 and AY3 according to 4mA correspondence 6553 and 20mA correspondence 32767 to convert into DX3 and DY 3;
if S3 is equal to 2, AX3 and AY3 are converted into DX3 and DY3 by linear interpolation according to 0mA corresponding to 0 and 20mA corresponding to 32767;
if S3 is equal to 3, AX3 and AY3 are linearly interpolated according to 0V for 0 and 5V for 32767 to DX3 and DY 3.
……
if Sn is 2, AXn and AYn are converted into DXn and DYn by linear interpolation according to 0mA corresponding to 0 and 20mA corresponding to 32767;
if Sn is 3, AXn and AYn are converted to DXn, DYn by linear interpolation according to 0V for 0 and 5V for 32767. And 6, outputting n pairs of twin signals DX1, DY1, DX2, DY2, DX3, DY3 … … DXn and DYn to return to the step 1.
A flowchart of the analog-to-digital conversion processing method of the first AD conversion module 3 is shown in fig. 2.
AXn and AYn are converted to DXn, DYn by linear interpolation according to 4mA for 6553 and 20mA for 32767, i.e.:
DXn＝6553+(32767-6553)(AXn-4mA)/(20mA-4mA)；
DYn＝6553+(32767-6553)(AYn-4mA)/(20mA-4mA)。
the linear interpolation conversion method is a conventional method, and is referred to as an encyclopedia linear interpolation entry.
The first twin channel signal processing module 4 collects n pairs of twin signals (DX1, DY1, DX2, DY2, DX3, DY3 … … DXn, DYn) output from the first AD conversion module 3, performs twin channel signal processing according to the channel specification signals S1, S2, S3 … … Sn output from the first dialing module 8, and then outputs n signals (DXY1, DXY2, DXY3 … … yn) to the first DA conversion module 5.
The twin channel signal processing method of the first twin channel signal processing module 4 comprises the following steps:
the method comprises the following steps: the n pairs of twin signals DX1, DY1, DX2, DY2, DX3, DY3 … … DXn, DYn output by the first AD conversion module 3 and the channel specification signals S1, S2, S3 … … Sn output by the first dialing module 8 are collected.
Step two: if S1 is equal to 1, the channel signal acquisition value zero point C1 Zero 6553 channel signal acquisition value full point C1 Is full of 32767; otherwise, the channel signal acquisition value zero point C1 Zero Channel signal acquisition value full point C1 Is full of ＝32767。
If S2 is equal to 1, the channel signal acquisition value zero point C2 Zero 6553 channel signal acquisition value full point C2 Is full of 32767; otherwise, the channel signal acquisition value zero point C2 Zero Channel signal acquisition value full point C2 Is full of ＝32767。
If S3 is equal to 1, the channel signal acquisition value is zeroPoint C3 Zero 6553 channel signal acquisition value full point C3 Is full of 32767; otherwise, the channel signal acquisition value zero point C3 Zero Channel signal acquisition value full point C3 Is full of ＝32767。
……
If Sn is equal to 1, the zero point Cn of the channel signal acquisition value Zero 6553, channel signal acquisition value full point Cn Is full of 32767; otherwise, the channel signal acquisition value zero point Cn Zero Equal to 0, the channel signal acquisition value is full Cn Is full of ＝32767。
Step three: dXY1 ═ DX1+ C1 Zero +C1 Is full of -DY1)/2；
DXY2＝(DX2+C2 Zero +C2 Is full of -DY2)/2；
DXY3＝(DX3+C3 Zero +C3 Is full of -DY3)/2；
……
DXYn＝(DXn+Cn Zero +Cn Is full of -DYn)/2。
Step IV: outputs n signals DXY1, DXY2, DXY3 … … DXYn, and returns to the step (r).
A flow chart of the twin channel signal processing method of the first twin channel signal processing module 4 is shown in fig. 3.
The first DA conversion module 5 collects n channel signals (DXY1, DXY2, DXY3 … … DXYn) output by the twin channel signal processing module 4, performs digital-to-analog conversion processing according to the channel specification signals S1, S2, S3 … … Sn output by the first dial module 8, and then outputs n channel signals (AXY1, AXY2, AXY3 … … AXYn) to the first signal output processing module 9.
The digital-to-analog conversion processing method of the first DA conversion module 5 includes the following steps:
step (1): the n channel signals DXY1, DXY2, DXY3 … … DXYn output by the first twin channel signal processing block 4 and the channel specification signals S1, S2, S3 … … Sn output by the first dialing block 8 are collected.
Step (2): if S1 is equal to 1, DXY1 is converted into AXY1 through linear interpolation according to 4mA corresponding to 6553 and 20mA corresponding to 32767;
if S1 is equal to 2, DXY1 is converted into AXY1 through linear interpolation according to 0 corresponding to 0mA and 32767 corresponding to 20 mA;
if S1 is equal to 3, DXY1 performs linear interpolation to convert to AXY1 according to 0 for 0V and 32767 for 5V.
And (3): if S2 is equal to 1, DXY2 is converted into AXY2 through linear interpolation according to 4mA corresponding to 6553 and 20mA corresponding to 32767;
if S2 is equal to 2, DXY2 is converted into AXY2 through linear interpolation according to 0 corresponding to 0mA and 32767 corresponding to 20 mA;
if S2 is equal to 3, DXY2 performs linear interpolation to convert to AXY2 according to 0 for 0V and 32767 for 5V.
And (4): if S3 is equal to 1, DXY3 is converted into AXY3 through linear interpolation according to 4mA corresponding to 6553 and 20mA corresponding to 32767;
if S3 is equal to 2, DXY3 is converted into AXY3 through linear interpolation according to 0 corresponding to 0mA and 32767 corresponding to 20 mA;
if S3 is equal to 3, DXY3 performs linear interpolation to convert to AXY3 according to 0 for 0V and 32767 for 5V.
……
And (5): if Sn is equal to 1, DXYn is converted into AXYn by linear interpolation according to 6553 corresponding to 4mA and 32767 corresponding to 20 mA;
if Sn is 2, DXYn is converted into AXYn by linear interpolation according to 0 corresponding to 0mA and 32767 corresponding to 20 mA;
if Sn is 3, DXYn is linearly interpolated to AXYn in 0V and 32767V to 5V.
And (6): outputting n channel signals (AXY1, AXY2, AXY3 … … AXYn), and returning to the step (1).
A flowchart of the digital-to-analog conversion processing method of the first DA conversion module 5 is shown in fig. 4.
The first control module 6 outputs control signals to the twin channel input module 1, the first signal preprocessing module 2, the first AD conversion module 3, the first twin channel signal processing module 4, the first DA conversion module 5, the first signal output processing module 9 and the output channel module 10. Thereby controlling the whole data acquisition and processing process. The whole data acquisition and processing process comprises n pairs of complementary twin signals (x1, y1, x2, y2, x3, y3 … … xn, yn) input from the outside into the analog twin signal receiver, and the whole data stream acquisition and processing process finally outputs n channel signals (xy1, xy2, xy3 … … xyn) through the output channel module 10 after the series of processing of the twin channel input module 1, the first signal preprocessing module 2, the first AD conversion module 3, the first twin channel signal processing module 4, the first DA conversion module 5 and the first signal output processing module 9.
The first control module 6 is respectively connected with the twin channel input module 1, the first signal preprocessing module 2, the first AD conversion module 3, the first twin channel signal processing module 4, the first DA conversion module 5, the first signal output processing module 9 and the output channel module 10.
The first power supply module 7 provides power for the twin channel input module 1, the first signal preprocessing module 2, the first AD conversion module 3, the first twin channel signal processing module 4, the first DA conversion module 5, the first control module 6, the first dial module 8, the first signal output processing module 9, and the first output channel module 10.
The pattern diagram of the dial man-machine interaction panel of the first dial module 8 is shown in fig. 5, and includes n dial frames including numbers "1", "2", "3" … … "n", each dial frame includes a dial block, and each dial block includes 3 dial bits including numbers "1", "2" and "3" in the dial frame.
The dialing number of the first dialing module 8 is consistent with the twin channel number contained in the twin channel input module 1, the number of the dialing is n, the numbers are respectively ' 1 ', ' 2 ', ' 3 ', ' … … ' n ', and the dialing number of the ' n ' correspondingly sets the analog quantity signal specification collected by the twin channel n of the twin channel input module 1. Each dial has 4 positions, "1" bit, "2" bit, and "3" bit.
If the analog quantity signal specification collected by the twin channel input module 1 twin channel n is 4-20 mA analog quantity signal, the user sets the dial corresponding to the twin channel n to be 1; if the analog quantity signal specification collected by the twin channel input module 1 twin channel n is 0-20 mA analog quantity signal, the user sets the dial corresponding to the twin channel n to be 2; and if the analog quantity signal specification collected by the twin channel input module 1 twin channel n is 0-5V analog quantity signal, setting the dial corresponding to the twin channel n to be 3 by the user.
The dial rule output method comprises the following steps:
step a, collecting dial position information.
Step b, if the dial of the '1' is a '1' bit, S1 is equal to 1; if the "1" dial is "2", S1 is 2; if the "1" dial is "3", S1 is 3.
If the "2" dial is a "1" bit, S2 is 1; if the 2-digit dial is 2, S2 is 2; if the 2-digit is a 3-bit, S2 is equal to 3.
If the "3" dial is a "1" bit, S3 is 1; if the 3-digit is 2, S3 is 2; if the "3" dial is "3", S3 is 3.
……
If the dial of 'n' is '1', Sn is 1; if the dial of 'n' is '2', Sn is 2; if the "n" number is "3", Sn is 3.
And c, outputting channel specification signals S1, S2 and S3 … … Sn, and returning to the step a.
A flowchart of the dialing rule output method is shown in fig. 6.
The first signal output processing module 9 collects n channel signals (AXY1, AXY2, AXY3 … … AXYn) output by the first DA conversion module 5, performs isolation amplification processing, and then outputs n channel signals (XY1, XY2, XY3 … … XYn) to the output channel module 10.
The output channel module 10 collects n channel signals (XY1, XY2, XY3 … … XYn) output by the first signal output processing module 9, performs isolation amplification processing, and outputs n channel signals (XY1, XY2, XY3 … … XYn)
A schematic diagram of an analog twin signal converter D for remote anti-electromagnetic interference transmission of analog signals is shown in FIG. 8.
The converter includes: an input channel module 10 ', a second signal preprocessing module 9 ', a second dialing module 8 ', a second control module 6 ', a second AD conversion module 5 ', a second twin channel signal processing module 4 ', a second DA conversion module 3 ', a second signal output processing module 2 ', and a twin channel output module 1 '.
The input channel module 10 'comprises n input channels and is used for acquiring input n channel signals XY 1', XY2 ', XY 3' … … XYn 'and outputting n channel signals XY 1', XY2 ', XY 3' … … XYn 'to the second signal preprocessing module 9';
the second signal preprocessing module 9 ' acquires n channel signals XY1 ', XY2 ', XY3 ' … … XYn ' output by the input channel module 10 ', performs pre-isolation amplification filtering processing, and then outputs n channel signals AXY1 ', AXY2 ', AXY3 ' … … AXYn ' to the second AD conversion module 5 ';
the second AD conversion module 5 ' collects the n channel signals AXY1 ', AXY2 ', AXY3 ', … … AXYn ' output by the second signal preprocessing module 9 ', and outputs the n channel signals DXY1 ', DXY2 ', DXY3 ', … … DXY ' to the second twin channel signal processing module 4 ';
the second twin channel signal processing module 4 'acquires n channel signals DXY 1', DXY2 ', DXY 3' … … DXYn 'output by the second AD conversion module 5', performs twin channel signal processing according to the channel specification signals S1 ', S2', S3 '… … Sn' output by the second dialing module 8 ', and outputs n pairs of complementary twin signals DX 1', DY1 ', DX 2', DY2 ', DX 3', DY3 '… … DXn', DYn 'to the second DA conversion module 3';
the second DA conversion module 3 'collects n pairs of twin signals DX 1', DY1 ', DX 2', DY2 ', DX 3', DY3 '… … DXn', DYn 'output by the second twin channel signal processing module 4', performs digital-to-analog conversion processing according to the channel specification signals S1 ', S2', S3 '… … Sn' output by the second dialing module 8 ', and then outputs n pairs of twin signals AX 1', AY1 ', AX 2', AY2 ', AX 3', AY3 '… … AXn', AYn 'to the second signal output processing module 2';
the second signal output processing module 2 ' collects n pairs of twin signals AX1 ', AY1 ', AX2 ', AY2 ', AX3 ', AY3 ' … … AXn ', AYn ' output by the second DA conversion module 3 ', performs isolation amplification processing, and then outputs n pairs of twin signals X1 ', Y1 ', X2 ', Y2 ', X3 ', Y3 ' … … Xn ', Yn ' to the second twin channel output module 4 ';
the second twin channel output module 4 ' outputs n pairs of complementary twin signals X1 ', Y1 ', X2 ', Y2 ', X3 ', Y3 ' … … Xn ', Yn ' output by the acquisition signal output processing module 2 ', and outputs n pairs of complementary twin analog quantity signals X1 ', Y1 ', X2 ', Y2 ', X3 ', Y3 ' … … Xn ', Yn ' through the twin channel output module 1 ';
the second control module 6 ' outputs control signals to the second twin channel output module 4 ', the second signal output processing module 2 ', the second DA conversion module 3 ', the second twin channel signal processing module 4 ' to control the data output processing process.
The converter comprises a second power module 7 ', a second power module 7 ' is a second twin channel output module 4 ', a second signal output processing module 2 ', a second DA conversion module 3 ', a second twin channel signal processing module 4 ', a second AD conversion module 5 ', a second control module 6 ', a second dial module 8 ', a second signal pre-processing module 9 ', and an input channel module 10 ' for providing power.
The second twin channel output module 4' comprises n pairs of twin channels, each pair comprising 2 twin signal output channels.
The n pairs of complementary twin signals are remotely transmitted through a cable and are reduced into analog quantity signals needing to be transmitted after conversion processing;
for 4-20 mA analog quantity signals, the two complementary twin analog quantity signals mean that the two analog quantity signals are added to be 24 mA;
for 0-20 mA analog quantity signals, the two complementary twin analog quantity signals mean that the two analog quantity signals are added to be 20 mA;
for 0-5V analog quantity signals, the two complementary twin analog quantity signals mean that the two analog quantity signals are added to be 5V.
The number of the second dialing module 8 ' is consistent with the number of the twin channels included in the second twin channel output module 4 ', the number of the second dialing module is n, the numbers of the second dialing module are respectively ' 1 ', ' 2 ', ' 3 ', ' … … ' n ', and the dialing code of the ' n ' is correspondingly provided with the specification of the analog quantity signal collected by the twin channel n ' of the second twin channel output module 4 '. Each dial has 3 positions, a "1 '" bit, a "2 '" bit, and a "3 '" bit;
if the analog quantity signal specification output by the second twin channel output module 4 ' twin channel n ' is 4-20 mA analog quantity signal, the user sets the dial corresponding to the twin channel n ' to be ' 1 '; if the analog quantity signal specification output by the twin channel output module 4 ' twin channel n ' is 0-20 mA analog quantity signal, the user sets the dial corresponding to the twin channel n ' to be ' 2 '; if the analog quantity signal specification output by the second twin channel output module 4 'twin channel n' is 0-5V analog quantity signal, the user sets the dial corresponding to the twin channel n 'to be 3' ″.
The invention will be further elucidated with reference to the figures and exemplary embodiments.
Example 1:
a liquid level sensor 11 of a hydraulic oil tank of a speed regulator hydraulic system measures a liquid level C of an oil tank 12 of the hydraulic system, an output 4-20 mA analog quantity signal is converted by an analog quantity twin signal converter D for remote anti-electromagnetic interference transmission of the analog quantity signal, a pair of complementary twin signals of 4-20 mA specification related to the liquid level of the hydraulic oil tank of the speed regulator hydraulic system is output, the pair of complementary twin signals are remotely transmitted through a signal transmission cable 13, an analog quantity twin signal receiver A for remote anti-electromagnetic interference transmission of the analog quantity signal is input, and the receiver is processed and output to a liquid level electronic display meter 14, as shown in figure 7.
The liquid level sensor 11 of the governor hydraulic system pressure oil tank measures the liquid level C of the oil tank 12 of the hydraulic system, outputs a hydraulic system pressure oil tank liquid level signal f1, the hydraulic system pressure oil tank liquid level signal f1 inputs an analog quantity twin signal converter D for remote anti-electromagnetic interference transmission of analog quantity signals, and then outputs a pair of complementary twin signals f1 and f2(f2 is 24mA-f1) of 4-20 mA specification relative to the liquid level of the governor hydraulic system pressure oil tank through a signal transmission cable 13. The two signals are transmitted to the analog quantity twin signal receiver A for the remote anti-electromagnetic interference transmission of the analog quantity signal by adopting different cores of the same cable, so that the external electromagnetic environment of the two signals is the same, and the electromagnetic interference signals received by the signal transmission are consistent and are delta. The analog quantity twin signal receiver acquires input hydraulic oil tank liquid level complementary twin signals f1+ delta and f2+ delta respectively.
Then in the analog twin signal receiver, AX1 ═ X1 ═ f1 +. Δ, and AX2 ═ X2 ═ f2 +. Δ.
Then DX 1-32767-X1/20 mA and DX 2-32767-X2/20 mA in the analog twin signal receiver.
Then DXY1 ═ DX1+ C1 in the analog twin signal receiver Zero +C1 Is full of -DY1)/2＝(32767*X1/20mA+6553+32767-32767*X2/20mA)/2＝f1/20mA*32767。
The analog twin signal receiver output XY1 XY1 AXY1 DXY1/32767 20mA f 1.
The invention relates to an analog twin signal receiver A for remote anti-electromagnetic interference transmission of analog signals, which outputs the analog signals to a liquid level electronic display meter 14 without electromagnetic interference signal delta items in a final expression of the analog signals.
Although the method of the present invention is described above with reference to the exemplary embodiment as applied to the case where the governor hydraulic system tank level sensor measures the hydraulic system tank level, and the output level analog signal is converted by the analog twin signal converter and received and recovered by the receiver, and then transmitted to the electronic level indicator, it should be understood by those skilled in the art that various changes may be made to the above exemplary embodiment without departing from the scope of the claims, and the method is widely applied to the transmission of analog signals of other specifications.
Claims (9)
1. An analog twin signal receiver for remote anti-electromagnetic interference transmission of an analog signal, comprising:
the device comprises a twin channel input module (1), a first signal preprocessing module (2), a first AD conversion module (3), a first twin channel signal processing module (4), a first DA conversion module (5), a first control module (6), a first dial module (8), a first signal output processing module (9) and an output channel module (10);
the twin channel input module (1) collects n pairs of complementary twin signals X1, Y1, X2, Y2, X3, Y3 … … Xn and Yn input from the outside, and outputs n pairs of twin signals X1, Y1, X2, Y2, X3, Y3 … … Xn and Yn to the first signal preprocessing module (2);
the complementary twin signals have the following meanings:
for 4-20 mA analog quantity signals, the two complementary twin analog quantity signals mean that the two analog quantity signals are added to be 24 mA; for 0-20 mA analog quantity signals, the two complementary twin analog quantity signals mean that the two analog quantity signals are added to be 20 mA; for 0-5V analog quantity signals, the two complementary twin analog quantity signals mean that the two analog quantity signals are added to be 5V;
the first signal preprocessing module (2) is used for acquiring n pairs of twin signals X1, Y1, X2, Y2, X3, Y3 … … Xn and Yn output by the twin channel input module (1), performing preprocessing isolation, amplification and filtering, and outputting n pairs of twin signals AX1, AY1, AX2, AY2, AX3, AY3 … … AXn and AYn to the first AD conversion module (3);
the first AD conversion module (3) is used for acquiring n pairs of twin signals AX1, AY1, AX2, AY2, AX3, AY3 … … AXn and AYn output by the first signal preprocessing module (2), performing analog-to-digital conversion processing according to channel specification signals S1, S2 and S3 … … Sn output by the first code dialing module (8), and then outputting n pairs of twin signals DX1, DY1, DX2, DY2, DX3, DY3 … … DXn and DYn to the first twin channel signal processing module (4);
the first twin channel signal processing module (4) is used for acquiring n pairs of twin signals DX1, DY1, DX2, DY2, DX3, DY3 … … DXn and DYn output by the first AD conversion module (3), performing twin channel signal processing according to channel specification signals S1, S2 and S3 … … Sn output by the first code dialing module (8), and then outputting n signals DXY1, DXY2 and DXY3 … … DXYn to the first DA conversion module (5);
the first DA conversion module (5) collects n channel signals (DXY1, DXY2 and DXY3 … … DXYn) output by the first twin channel signal processing module (4), performs digital-to-analog conversion processing according to channel specification signals S1, S2 and S3 … … Sn output by the first dial module (8), and then outputs n channel signals AXY1, AXY2 and AXY3 … … AXYn to the first signal output processing module (9);
the first signal output processing module (9) collects n channel signals AXY1, AXY2 and AXY3 … … AXYn output by the first DA conversion module (5), performs isolation amplification processing, and then outputs n channel signals XY1, XY2 and XY3 … … XYn to the output channel module (10);
the output channel module (10) collects n channel signals XY1, XY2 and XY3 … … XYn output by the first signal output processing module (9), performs isolation amplification processing, and outputs n channel signals XY1, XY2 and XY3 … … XYn;
the device comprises a first control module (6), a first signal preprocessing module (2), a first AD conversion module (3), a first twin channel signal processing module (4), a first DA conversion module (5), a first signal output processing module (9), an output channel module (10) and a first control module (6), wherein the first control module (6) is used for controlling a data acquisition and processing process.
2. An analog twin signal receiver for long-distance anti-electromagnetic interference transmission of an analog signal according to claim 1, wherein: the receiver further comprises a first power supply module (7), wherein the first power supply module (7) is a twin channel input module (1), a first signal preprocessing module (2), a first AD conversion module (3), a first twin channel signal processing module (4), a first DA conversion module (5), a first control module (6), a first dial module (8), a first signal output processing module (9) and an output channel module (10) provide power.
3. An analog twin signal receiver for long-range anti-electromagnetic interference transmission of analog signals according to claim 1, wherein: the twin channel input module (1) comprises n pairs of twin channels, each pair of twin channels comprising 2 signal acquisition input channel units.
4. An analog twin signal receiver for long-range anti-electromagnetic interference transmission of analog signals according to claim 1, wherein: the first dial module (8) outputs channel specification signals S1, S2 and S3 … … Sn to the first AD conversion module (3), the first twin channel signal processing module (4) and the first DA conversion module (5) according to the setting of a dial by a user and a dial rule output method, wherein Sn is the channel specification signal of the twin channel n of the twin channel input module (1).
5. An analog twin signal receiver for long-distance anti-electromagnetic interference transmission of analog signals according to claim 1 or 4, characterized in that: the dialing number of the first dialing module (8) is consistent with the twin channel number contained in the twin channel input module (1), the number of the dialing is n, the numbers are respectively '1', '2', '3' … … 'n', the dialing number of the 'n' is correspondingly provided with the analog quantity signal specification collected by the twin channel n of the twin channel input module (1), and each dialing has 3 positions, namely '1', '2' and '3':
if the analog quantity signal specification collected by the twin channel n of the twin channel input module (1) is 4-20 mA analog quantity signal, the user sets the dial corresponding to the twin channel n to be 1;
if the analog quantity signal specification collected by the twin channel n of the twin channel input module (1) is 0-20 mA analog quantity signal, the user sets the dial corresponding to the twin channel n to be 2;
if the analog quantity signal specification collected by the twin channel n of the twin channel input module (1) is 0-5V analog quantity signal, the user sets the dial corresponding to the twin channel to be 3.
6. An analog twin signal receiver for long-range anti-electromagnetic interference transmission of analog signals according to claim 1, wherein: the analog-to-digital conversion processing method of the first AD conversion module (3) comprises the following steps:
step 1, collecting n pairs of twin signals AX1, AY1, AX2, AY2, AX3, AY3 … … AXn and AYn output by a first signal preprocessing module (2) and channel specification signals S1, S2 and S3 … … Sn output by a first code dialing module (8);
step 2, if S1 is equal to 1, AX1 and AY1 are linearly interpolated according to 4mA corresponding to 6553 and 20mA corresponding to 32767 to be converted into DX1 and DY 1;
if S1 is equal to 2, AX1 and AY1 are converted into DX1 and DY1 by linear interpolation according to 0mA corresponding to 0 and 20mA corresponding to 32767;
if S1 is 3, AX1 and AY1 are linearly interpolated according to 0V corresponding to 0 and 5V corresponding to 32767 to be converted into DX1 and DY 1;
step 3, if S2 is equal to 1, carrying out linear interpolation on AX2 and AY2 according to 4mA correspondence 6553 and 20mA correspondence 32767 to convert into DX2 and DY 2;
if S2 is equal to 2, AX2 and AY2 are converted into DX2 and DY2 by linear interpolation according to 0mA corresponding to 0 and 20mA corresponding to 32767;
if S2 is equal to 3, AX2 and AY2 are linearly interpolated according to 0V corresponding to 0 and 5V corresponding to 32767 to be converted into DX2 and DY 2;
step 4, if S3 is equal to 1, carrying out linear interpolation on AX3 and AY3 according to 4mA correspondence 6553 and 20mA correspondence 32767 to convert into DX3 and DY 3;
if S3 is equal to 2, AX3 and AY3 are converted into DX3 and DY3 by linear interpolation according to 0mA corresponding to 0 and 20mA corresponding to 32767;
if S3 is 3, AX3 and AY3 are linearly interpolated according to 0V corresponding to 0 and 5V corresponding to 32767 to be converted into DX3 and DY 3;
……
step 5, if Sn is equal to 1, AXn and AYn are linearly interpolated according to 6553 corresponding to 4mA and 32767 corresponding to 20mA and converted into DXn and DYn;
if Sn is 2, AXn and AYn are converted into DXn and DYn by linear interpolation according to 0mA corresponding to 0 and 20mA corresponding to 32767;
if Sn is 3, AXn and AYn are linearly interpolated according to 0V corresponding to 0,5V corresponding to 32767 and converted into DXn and DYn;
and 6, outputting n pairs of twin signals DX1, DY1, DX2, DY2, DX3, DY3 … … DXn and DYn to return to the step 1.
7. An analog twin signal receiver for long-range anti-electromagnetic interference transmission of analog signals according to claim 1, wherein: the twin channel signal processing method of the first twin channel signal processing module (4) comprises the steps of: the method comprises the following steps: acquiring n pairs of twin signals DX1, DY1, DX2, DY2, DX3, DY3 … … DXn and DYn output by the first AD conversion module (3) and channel specification signals S1, S2 and S3 … … Sn output by the first code dialing module (8);
step two: if S1 is equal to 1, the channel signal acquisition value zero point C1 Zero 6553 channel signal acquisition value full point C1 Is full of 32767; otherwise, the channel signal acquisition value zero point C1 Zero Channel signal acquisition value full point C1 Is full of ＝32767；
If S2 is equal to 1, the channel signal acquisition value zero point C2 Zero 6553 channel signal acquisition value full point C2 Is full of 32767; otherwise, the channel signal acquisition value zero point C2 Zero Channel signal acquisition value full point C2 Is full of ＝32767；
If S3 is equal to 1, the channel signal acquisition value zero point C3 Zero 6553 channel signal acquisition value full point C3 Is full of 32767; otherwise, the channel signal acquisition value zero point C3 Zero Channel signal acquisition value full point C3 Is full of ＝32767；
……
If Sn is equal to 1, the zero point Cn of the channel signal acquisition value Zero 6553, channel signal acquisition value full point Cn Is full of 32767; otherwise, the channel signal acquisition value zero point Cn Zero When the channel signal acquisition value is equal to 0, the full point Cn of the channel signal acquisition value Is full of ＝32767；
Step three: dXY1 ═ DX1+ C1 Zero +C1 Is full of -DY1)/2；
DXY2＝(DX2+C2 Zero +C2 Is full of -DY2)/2；
DXY3＝(DX3+C3 Zero +C3 Is full of -DY3)/2；
……
DXYn＝(DXn+Cn Zero +Cn Is full of -DYn)/2；
Step IV: outputs n signals DXY1, DXY2, DXY3 … … DXYn, and returns to the step (r).
8. An analog twin signal receiver for long-distance anti-electromagnetic interference transmission of an analog signal according to claim 1, wherein: the digital-to-analog conversion processing method of the first DA conversion module (5) comprises the following steps:
step (1): acquiring n channel signals DXY1, DXY2 and DXY3 … … DXYn output by the first twin channel signal processing module (4) and channel specification signals S1, S2 and S3 … … Sn output by the first dialing module (8);
step (2): if S1 is equal to 1, DXY1 is converted into AXY1 through linear interpolation according to 4mA corresponding to 6553 and 20mA corresponding to 32767;
if S1 is equal to 2, DXY1 carries out linear interpolation according to 0 corresponding to 0mA and 32767 corresponding to 20mA to be converted into AXY 1;
if S1 is equal to 3, DXY1 performs linear interpolation according to 0 for 0V and 32767 for 5V to convert into AXY 1;
and (3): if S2 is equal to 1, DXY2 is converted into AXY2 through linear interpolation according to 4mA corresponding to 6553 and 20mA corresponding to 32767;
if S2 is equal to 2, DXY2 is converted into AXY2 through linear interpolation according to 0 corresponding to 0mA and 32767 corresponding to 20 mA;
if S2 is equal to 3, DXY2 performs linear interpolation according to 0 for 0V and 32767 for 5V to convert into AXY 2;
and (4): if S3 is equal to 1, DXY3 is converted into AXY3 through linear interpolation according to 4mA corresponding to 6553 and 20mA corresponding to 32767;
if S3 is equal to 2, DXY3 is converted into AXY3 through linear interpolation according to 0 corresponding to 0mA and 32767 corresponding to 20 mA;
if S3 is equal to 3, DXY3 performs linear interpolation according to 0 for 0V and 32767 for 5V to convert into AXY 3;
……
and (5): if Sn is equal to 1, DXYn is converted into AXYn by linear interpolation according to 6553 corresponding to 4mA and 32767 corresponding to 20 mA;
if Sn is 2, DXYn is converted into AXYn by linear interpolation according to 0 corresponding to 0mA and 32767 corresponding to 20 mA;
if Sn is 3, DXYn is converted into AXYn by linear interpolation according to 0 corresponding to 0V and 32767 corresponding to 5V;
and (6): outputting n channel signals (AXY1, AXY2, AXY3 … … AXYn), and returning to the step (1).
9. An analog twin signal receiver for long-range anti-electromagnetic interference transmission of analog signals according to claim 1, wherein: the method for outputting the dialing rule of the first dialing module (8) comprises the following steps:
step a, collecting dial position information;
step b, if the dial of the '1' is a '1' bit, S1 is equal to 1; if the "1" dial is "2", S1 is 2; if the "1" dial is "3", S1 is 3;
if the 2-digit is 1, S2 is 1; if the 2-digit dial is 2, S2 is 2; if the 2-digit is "3", S2 is 3;
if the "3" dial is a "1" bit, S3 is 1; if the 3-digit is 2, S3 is 2; if the 3-digit is a 3-digit, S3 is 3;
……
if the dial of the number "n" is the bit "1", Sn is 1; if the dial of 'n' is '2', Sn is 2; if the dial of 'n' is '3', Sn is 3;
and c, outputting channel specification signals S1, S2 and S3 … … Sn, and returning to the step a.
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