CN105243826B - A kind of adjustment of sensitivity and intermittent current transmission method of current transmission signal - Google Patents
A kind of adjustment of sensitivity and intermittent current transmission method of current transmission signal Download PDFInfo
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Abstract
A kind of adjustment of sensitivity and intermittent current transmission method of current transmission signal, in the system for carrying out fault diagnosis to rotating machinery using generalized resonance, resonance demodulation technique, using voltage current adapter A, sensor signal voltage VC is converted into continuous current IC, continuous current IC remote transmission is to detecting instrument, using current-to-voltage convertor B, continuous current IC is converted to the detecting instrument input voltage VY for being equivalent to and restoring sensor signal voltage VC value.The present invention can solve the interference such as powerful earth-current on power equipment to the adverse effect of detection device, and recognition detection equipment itself problem.
Description
Technical field
The present invention relates to the detection signal transmission technologies in a kind of movable machinery equipment fault on-line checking diagnostic techniques, special
It is not a kind of adjustment of sensitivity based on current transmission signal and intermittent current transmission method.For using generalized resonance, being total to
Demodulation techniques of shaking carry out rotating machinery in the system of fault diagnosis, biography when detection point sensor etc. is far from detecting instrument
The anti-interference transmission of sensor signal.
Background technique
Currently, domestic electric locomotive, subway, the high-speed rail overwhelming majority use AC power power supply, by cross-straight-intersection
Inverter system drives alternating current generator as power.Used inverter becomes the transformed of exchange in AC to DC, direct current
Cheng Zhong, during by the AC voltages transmission of inversion to alternating current generator, each component of car body as power ground it
Between generate very big ground voltage interference, fault diagnosis is being carried out to rotating machinery using generalized resonance, resonance demodulation technique
System in, the interference of ground voltage between the installing component of component and instrument that sensor is installed will be in detection signal transmission
Current interference and ground voltage interference are generated in line, totally unfavorable influence are generated to the analog signal transmission of equipment, if mould
Quasi- signal uses voltage transmission scheme, a kind of railway locomotive EEF bogie event as disclosed in Chinese patent application 201320679842.5
Hinder on-line monitoring and diagnosis system, the analog signal of the system uses voltage transmission scheme from sensor to preprocessor, in reality
Just by very big interference signal in the application process of border, and these interference signals have seriously affected the accuracy of fault diagnosis.
The detection signal transmission plan such as sensor common at present, has sensor housing K, sensor usually in structure
Ground CGND, sensor reference point of potential G, instrumentally AGND, instrument reference point of potential J.In sensor CGND with instrumentally
There are grounding wire impedance R between AGND, in sensor housing K and sensor there are distribution capacity C0 between CGND.Due to sensor shell
Where body there is shell interference voltage UK in component and instrument between the parts, because the coupling of distribution capacity C0 makes interference electricity
UK is pressed to generate interference electric current UK/XC0 to CGND, in formula, XC0 is the capacitive reactance of capacitor C0；Power supply of the instrument to sensor, makes ground wire
There are supply current, pressure drop of the two on grounding wire impedance R can become interference voltage VCGND.Due to sensor signal voltage
VC directly in a manner of classical voltage transmission remote transmission to detecting instrument receiving end Y, interference voltage VCGND certainty and sensor
Signal voltage VC superposition, generate the interference to the input voltage VY of detecting instrument YI.As shown in Figure 1.
For the above problem for solving traditional voltage transmission scheme, propose a kind of current transmission signal adjustment of sensitivity and
Intermittent current transmission method.
Summary of the invention
In view of the above-mentioned problems, the object of the present invention is to provide a kind of adjustment of sensitivity of current transmission signal and intermittent currents
Transmission method, to solve in the system for using generalized resonance, resonance demodulation technique to carry out fault diagnosis to rotating machinery, electricity
Powerful grounding current EMI, thunder and lightning interference and electromagnetic interference on the power equipments such as power locomotive, wind-driven generator is to detection device
Adverse effect, and recognition detection equipment itself problem.
A kind of adjustment of sensitivity and intermittent current transmission method of current transmission signal, it is characterized in that: total using broad sense
Vibration, resonance demodulation technique carry out rotating machinery in the diagnostic system of failure, by sensor signal voltage VC, interference-free
It is transferred to the detecting instrument that there is connection grounding wire impedance R between sensor, using voltage current adapter A, voltage and current
Sensor signal voltage VC is converted to continuous current IC by conversion coefficient V_I=1/RX, IC=VC*V_I=VC/RX, in formula,
VC is the signal voltage of sensor, and 1/RX is Voltage to current transducer coefficient V_I；The continuous current IC remote transmission converted to inspection
Instrument is surveyed, using current-to-voltage convertor B, Current Voltage conversion coefficient I_V=RJ, the continuous current IC of remote transmission is turned
It is changed to the detecting instrument input voltage VY:VY=IC*I_V=IC*RJ=VC/ for being equivalent to and restoring sensor signal voltage VC value
RX*RJ=VC, in formula, IC is continuous current, and RJ is to receive resistance, and VC is the signal voltage of sensor；
When sensor signal voltage VC, voltage current adapter A and reference point of potential G reference voltage VG three together
When, the continuous current IC of voltage current adapter A output is the reference voltage VG of sensor signal voltage VC and potential reference point G
It is divided to the sum of conversion value after 1/X: IC=VC/RX+VG/RX/X；The base of reference point of potential J is had in current-to-voltage convertor B
When quasi- voltage VJ, received continuous current IC is converted to the glitch-free detecting instrument input of relative to detecting instrument AGND
Voltage VY, VY=IC*RJ+VJ=(VC/RX+VG/RX/X) * RJ+VJ, i.e. instrument input voltage by signal input voltage VYJ and
DC input voitage VYZ two parts are formed by stacking, i.e. VY=VYJ+VYZ, wherein VYJ=(VC/RX) * RJ, VYZ=(VG/RX/
X)*RJ+VJ。
A kind of adjustment of sensitivity and intermittent current transmission method of current transmission signal, in order to which whether identification sensor accesses
Detecting instrument, it is characterised in that design are as follows: when being not inserted into sensor, detecting instrument end current-to-voltage convertor B is exported defeated
Enter the reference voltage VJ that voltage VY is equal to reference point of potential J；And when being inserted into sensor, detecting instrument end current-to-voltage convertor B
The DC input voitage VYZ of the input voltage VY of output is equal to the reference voltage VG of potential reference point G, or only has fixation with VG
Difference.It proves and design is as follows.
A kind of adjustment of sensitivity and intermittent current transmission method of current transmission signal, in order to which the current potential of detection sensor is joined
The variation that the reference voltage VG of examination point G may occur by faults itself, it is characterised in that design method are as follows:
The reference voltage VG of potential reference point G is carried out 1/X times of partial pressure and obtains VX=VG/X by voltage current adapter A, i.e.,
When downsampling factor to the reference voltage VG of potential reference point G is X, have
VX=VG/X --- --- (1)
VX is superimposed with sensor signal voltage VC and is converted to continuous current IC, and Voltage to current transducer coefficient V_I is depended on
Current-limiting resistance RX, i.e. V_I=1/RX, IC=(VG/X+VC) * V_I=(VG/X+VC)/RX；And the electricity of current-to-voltage convertor B
Galvanic electricity presses size of the conversion coefficient I_V depending on receiving resistance RJ:
RJ=N*RX --- --- (2)
I.e. Current Voltage conversion coefficient is I_V=RJ=N*RX, wherein N is transmission coefficient, is defined as: N=RJ/RX, RJ
One end receive IC, it is another to terminate to reference point of potential J, then have detecting instrument input voltage VY:
VY=VJ+RJ*IC=VJ+RJ* (VG/X+VC)/RX=VJ+N*RX (VG/X+VC)/RX,
VY=VJ+N* (VG/X+VC) --- --- (3)
That is: in detecting instrument input voltage VY, the signal input voltage VYJ containing N times of sensor signal voltage VC:
VYJ=N*VC --- --- (4)
With DC input voitage VYZ:
VYZ=VJ+N*VG/X --- --- (5)；
Since sensor generallys use the power supply of detecting instrument, to guarantee signal dynamic range big as far as possible, sensor
When the reference voltage VG and sensor of potential reference point G accesses instrument, the DC input voitage VYZ of detecting instrument can be taken as approaching
In the supply voltage half of detecting instrument, therefore the combining for downsampling factor X of detecting instrument reference voltage VJ and reference voltage VG sets
Meter criterion (method) may is that
In order to which the VYZ intuitively obtained with detection expresses VG, the DC input voitage VYZ of detecting instrument is enabled to be equal to sensor
The reference voltage VG of potential reference point G, even:
VYZ=VJ+N*VG/X=VG,
Then having the design method of VJ is:
VJ=VG-N*VG/X=VG* (X-N)/X --- --- (6)
Since (in the circuit using single supply) VJ cannot be limited to N≤X less than zero；
When it is VG ' that the reference voltage VG of the reference G of sensor side changes for some reason, just there is detecting instrument by formula (5), (6)
DC input voitage VYZ ':
VYZ '=VJ+N*VG '/X --- --- (7)
Then the method (general formula) of the reference voltage VG ' of the reference G of detection sensor is:
VG '=(VYZ '-VJ) * X/N --- --- (8).
A kind of adjustment of sensitivity and intermittent current transmission method of current transmission signal, characterized in that the voltage and current
The design method of converter are as follows: establish identity R1/R2=(R31 ∥ R32)/R4=K, in formula, ∥ is oeprator in parallel, then
There is the downsampling factor X for VG are as follows:
X=1/ (1- (K+1) * R32 ∥ R4/ (R31+R32 ∥ R4))/K --- --- (9)；
R1, R2, R31, R32, R4 respectively indicate resistance 1, resistance 2, resistance 31, resistance 32 and resistance 4.
A kind of adjustment of sensitivity and intermittent current transmission method of current transmission signal, characterized in that the Current Voltage
The design method of converter B are as follows:
When receiving circuit using inverter cricuit, because circuit has carried out reverse phase, therefore the DC input voitage of detecting instrument
VYZ ':
VYZ '=VJ-N*VG '/X --- --- (10)
When reception circuit does not use negater circuit, the DC input voitage VYZ ' of detecting instrument:
VYZ '=VJ+N*VG '/X --- --- (7)；
In formula, N is transmission coefficient, VG is reference voltage VG.
A kind of adjustment of sensitivity and intermittent current transmission method of current transmission signal, in order to overcome external disturbance radiator
To the distribution capacity between the transmission line of electric current transmission to electric current transmission line radiation interference, characterized in that voltage and current
Electric current transmission line between converter A and current-to-voltage convertor B uses shielding line, and the core wire of the shielding line is as transmission electric current
The transmission line of signal, and the shielded layer of the shielding line is opened a way in the one end voltage current adapter A, the other end is converted in Current Voltage
Device B mono- terminates instrumentally line AGND.
Using the present invention, so that the grounding wire impedance R being present between instrument ground wire AGND and sensor ground wire CGND does not go out
Now in formula (1)~formula (8), no matter sensor operating current or external disturbance UK by sensor housing to sensing
The interference that the interference electric current that the distribution capacity C0 of device ground wire etc. is introduced flows through grounding wire impedance R is not present in the input of detecting instrument
In voltage, be conducive to interference caused by resisting outer bound pair sensor housing and sensor ground wire；It also helps and judges that sensor can
Instrument can not be accessed, the faults itself for the detection devices such as sensor reference voltage changes because of fault, that is, realize inspection
The diagnosis of the faults itselfs such as sensor, sensor and the instrument connection state of measurement equipment.
Detailed description of the invention
Fig. 1 is the voltage transmission structure chart of the prior art；
Fig. 2 is electric current transmission structure figure；
Fig. 3 is electric current transmission plan figure；
Fig. 4 is Fig. 3 electric current transmission plan simulated effect proof diagram；
Fig. 5 is instance graph of the electric current transmission with mutually output；
Fig. 6 is simulated effect proof diagram of Fig. 5 electric current transmission with mutually output；
Fig. 7 is the instance graph of electric current transmission anti-phase output；
Fig. 8 is the simulated effect proof diagram of Fig. 7 electric current transmission anti-phase output.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and embodiments.
Embodiment 1
Reference Fig. 3, a kind of adjustment of sensitivity and intermittent current transmission method of current transmission signal, it is characterized in that: using
Sensor signal voltage VC is converted to continuous current by voltage current adapter A, Voltage to current transducer coefficient V_I=1/RX
IC, IC=VC*V_I=VC/RX, in formula, VC is the signal voltage of sensor, and 1/RX is Voltage to current transducer coefficient；It is converted
Continuous current IC remote transmission to detecting instrument；Using current-to-voltage convertor B, Current Voltage conversion coefficient I_V=RJ,
The continuous current IC that remote transmission is come is converted to and is equivalent to the detecting instrument input voltage for restoring sensor signal voltage VC value
VY, VY=IC*I_V=IC*RJ=VC/RX*RJ, in formula, IC is continuous current, and RJ is to receive resistance, and VC is the letter of sensor
Number voltage；
When sensor signal voltage VC and voltage current adapter A has the reference voltage VG of potential reference point G, voltage
The reference voltage VG that the continuous current IC of current converter A output is sensor signal voltage VC and potential reference point G is divided to
The sum of conversion value after 1/X: IC=VC/RX+VG/RX/X, in formula, X is downsampling factor；Current potential is had in current-to-voltage convertor B
When the reference voltage VJ of datum mark J, received continuous current IC is converted to the glitch-free inspection of relative to detecting instrument AGND
Instrument input voltage VY, VY=IC*RJ+VJ are surveyed, i.e., instrument input voltage is by signal input voltage VYJ and DC input voitage
VYZ two parts are formed by stacking, i.e. VY=VYJ+VYZ, wherein VYJ=(VC/RX) * RJ, VYZ=(VG/RX/X) * RJ+VJ, such as
Shown in Fig. 3.
A kind of adjustment of sensitivity and intermittent current transmission method of current transmission signal, in order to which whether identification sensor accesses
Detecting instrument, it is characterised in that design are as follows: due to VY=IC*RJ+VJ, when being not inserted into sensor, because of IC=0, detector
The input voltage VY of device end current-to-voltage convertor B output is equal to the reference voltage VJ of reference point of potential J, and is inserted into sensor
When, detecting instrument end current-to-voltage convertor B output input voltage VY DC input voitage VYZ be designed parameter guarantee and
Reference voltage VG equal to potential reference point G.
A kind of adjustment of sensitivity and intermittent current transmission method of current transmission signal, in order to which the current potential of detection sensor is joined
The reference voltage VG of examination point G, it is characterised in that design method are as follows:
The voltage VG of potential reference point G is carried out 1/X times of partial pressure and obtains VX by voltage current adapter A, i.e., to potential reference
The downsampling factor of the reference voltage VG of point G is X,
VX=VG/X --- --- (1)
VX is superimposed with sensor signal voltage VC and is converted to continuous current IC, and Voltage to current transducer coefficient V_I is depended on
Current-limiting resistance RX is defined as V_I=1/RX, IC=(VG/X+VC) * V_I=(VG/X+VC)/RX；And current-to-voltage convertor
The Current Voltage conversion coefficient I_V of B depends on receiving the size of resistance RJ,
RJ=N*RX --- --- (2)
That is I_V=RJ=N*RX, wherein N is transmission coefficient, is defined as N=RJ/RX, and one end of RJ receives IC, the other end
It is connected to reference point of potential J, then there is detecting instrument input voltage VY:
VY=VJ+RJ*IC=VJ+RJ* (VG/X+VC)/RX=VJ+N*RX (VG/X+VC)/RX,
VY=VJ+N* (VG/X+VC) --- --- (3)
That is: in detecting instrument input voltage VY, the signal input voltage VYJ containing N times of sensor signal voltage VC:
VYJ=N*VC --- --- (4)
With DC input voitage VYZ:
VYZ=VJ+N*VG/X --- --- (5)；
Since sensor generallys use the power supply of detecting instrument, to guarantee signal dynamic range big as far as possible, sensor
DC input voitage VYZ when the reference voltage VG and sensor of potential reference point G accesses instrument can be taken as close to detector
The supply voltage of device half, therefore the co-design method of the downsampling factor X of detecting instrument reference voltage VJ and reference voltage is (quasi-
Then) it may is that
It enables the DC input voitage VYZ of detecting instrument be equal to the reference voltage VG of sensor potential reference point G, is:
VYZ=VJ+N*VG/X=VG,
Then having the design method of VJ is:
VJ=VG-N*VG/X=VG* (X-N)/X --- --- (6)
Since VJ cannot be limited to N≤X less than zero；
When it is VG ' that the reference G of sensor side and its reference voltage VG change for some reason, just there is the direct current of detecting instrument to input
Voltage VYZ ':
VYZ '=VJ+N*VG '/X --- --- (7)
Then the method for the reference voltage VG ' of the reference G of detection sensor is:
VG '=(VYZ '-VJ) * X/N --- --- (8).
As shown in figure 3, the reference voltage VG=5V of sensor potential reference point G is set, the downsampling factor X=of reference voltage
(R1+R2)/R1=(300k+1.2M)/300k=5, transmission coefficient N=1, Voltage to current transducer coefficient V_I=1/1000, i.e. RX
=1k Ω；According to formula (2), there is RJ=N*RX=1k Ω,
Then Parameter design and computation is:
According to formula (1), there is VX=VG/X=5/5=1V,
According to formula (6), there is VJ=VG* (X-1)/X=5* (5-1)/5=4V；
According to formula (7) theoretical calculation are as follows: VYZ '=VJ+N*VG '/X=4+1*5/5=5V；
As shown in figure 4, emulation detection are as follows: VYZ '=VY=5V meets Theoretical Design.
As shown in figure 4, when shell disturbing pulse voltage VK=200VPP, shell to the coupled capacitor C0=100p of CGND,
When grounding wire impedance R=1k Ω, signal voltage VC=2VPP, although grounding interference peaking voltage VCGND=150VP, and
The DC operation piezoelectric voltage of VCGND reaches 3.5V, but detecting instrument input voltage VY=2VPP, and is equal to sensor signal voltage VC
=2VPP；DC component, that is, VY average value VYZ=5V is equal with the reference voltage VG=5V of potential reference point G；It realizes pair
The correct transmission of the reference voltage VG of sensor signal VC and potential reference point G is without by shell interference voltage VK and sensor work
Make the interference effect of pressure drop of the electric current in grounding wire impedance R.This is because instrument input voltage formula (3) VY=VJ+ of the design
RJ*IC=VJ+RJ* (VG/X+VC)/RX=VJ+N*RX (VG/X+VC)/RX=VJ+N* (VG/X+VC) is without above-mentioned interference electricity
The factor of pressure.
Embodiment 2
A sensor signal VC and reference voltage VG using single power supply is designed by voltage current adapter A, is turned
It is changed to electric current IC, the current-to-voltage convertor B of teletransmission to the detecting instrument for also using single power supply, by receiving resistance RJ and base
Quasi- voltage VJ to instrument ground wire AGND generates instrument input voltage VY to AGND in the one end for receiving resistance RJ reception IC, straight
Flow component of voltage VYZ=VG, signal voltage component VYJ=VC, and sensor ground wire CGND and instrument ground wire AGND it
Between there are when grounding wire impedance R, instrument input voltage VY flows through the interference electricity generated when R without source current and external disturbance electric current
Pressure.
Physical circuit to achieve the above object as shown in figure 5,
Design requirement are as follows:
The reference voltage VG=5V of sensor potential reference point G is equal to instrument DC input voitage VYZ=5V；Voltage and current
Conversion coefficient is V_I=1/3000, i.e. V_I=1mA/3V；Instrument applied signal voltage VYJ is equal to sensor signal voltage VC.
According to definition: V_I=1/RX then has RX=1/V_I=3k Ω；
Due to constant current output electric current IC=VC/RX；
According to formula (4), VYJ=N*VC, i.e. instrument signal input voltage VYJ are equal to the requirement of sensor signal VC, there is VYJ
=IC*N*RJ=1*VC=IC*RX, obtains:
Instrument input resistance RJ=RX/N=3k Ω；
According to definition: N=RJ/RX is obtained:
Transmission coefficient N=1；
Specific implementation circuit as shown in Figure 5, the design method of voltage current adapter is, by resistors match at identical
Formula: R1/R2=(R31 ∥ R32)/R4=K.R3=R31 ∥ R32 is enabled,
As R2 > > RX,
V_I=(V2-V3)/RX=(VC+VG/X)/RX
V+=(VC+VG-V3) * R2/ (R1+R2)+V3
V-=V2*R3/ (R3+R4)+VG*R31/ (R31+R32 ∥ R4)
Based on amplifier high-gain, there is V+=V-, it may be assumed that
(VC+VG-V3) * R2/ (R1+R2)+V3=V2*R3/ (R3+R4)+VG*R31/ (R31+R32 ∥ R4)
General solution:
(VC+VG-V3) * R2/ (R1+R2)+V3=V2*R3/ (R3+R4)+VG*R32 ∥ R4/ (R31+R32 ∥ R4)
VC*R2/ (R1+R2)+V3 [1-R2/ (R1+R2)]=V2*R3/ (R3+R4)+VG*R32 ∥ R4/ (R31+R32 ∥
R4)
VC*R2/ (R1+R2)+VG* (R2/ (R1+R2)-R32 ∥ R4/ (R31+R32 ∥ R4))=V2*R3/ (R3+R4)-V3
[1-R2/(R1+R2)]
VC/ (K+1)+VG* (1/ (K+1)-R32 ∥ R4/ (R31+R32 ∥ R4))=(V2-V3) * K/ (1+K)
(VC+VG* (1- (K+1) * R32 ∥ R4/ (R31+R32 ∥ R4)))/RX=(V2-V3) * K/RX=V_I=(VC+
VG/X)/RX
Therefore there is the downsampling factor X of VG:
X=1/ (1- (K+1) * R32 ∥ R4/ (R31+R32 ∥ R4))/K --- --- (9)
For specific implementation circuit shown in fig. 5, due to K=R1/R2=1.According to formula (9),
There is X=1/ (1- (K+1) * R32 ∥ R4/ (R31+R32 ∥ R4))/K
=1/ (1- (1+1) * 300k Ω ∥ 150k Ω/(300k Ω+300k Ω ∥ 150k Ω))/1=2
Then Parameter design and computation is:
According to formula (1), there is VX=VG/X=5/2=2.5V,
According to formula (6), there is VJ=VG* (X-1)/X=5* (2-1)/2=2.5V；
According to formula (7) theoretical calculation are as follows: VYZ '=VJ+N*VG '/X=2.5+1*5/2=5V；
Fig. 6 is the simulation result for above-mentioned (Fig. 5) design, it was demonstrated that: as reference voltage VG=5V, input signal VC=
When 1VP, DC input voitage VYZ '=5V contained by instrument input voltage VY, signal input voltage VYJ=1VP.Meet design
It is required that.
Embodiment 3
A sensor signal VC and reference voltage VG using single power supply is designed by voltage current adapter A, is turned
Be changed to electric current IC, the current-to-voltage convertor B of teletransmission to the detecting instrument using both positive and negative power supply, by receive resistance RJ and
Reference voltage VJ to instrument ground wire AGND generates instrument input voltage VY to AGND in the one end for receiving resistance RJ reception IC,
DC voltage component VYZ=0, signal voltage component VYJ=VC, and sensor ground wire CGND and instrument ground wire AGND it
Between there are when grounding wire impedance R, instrument input voltage VY hits external disturbance electric current without source current and flows through the interference electricity generated when R
Pressure.
Physical circuit to achieve the above object as shown in fig. 7,
Design requirement are as follows:
The reference voltage VG=5V of sensor potential reference point G, instrument DC input voitage VYZ=0V；Voltage and current turns
Changing coefficient is V_I=1/3000, i.e. V_I=1mA/3V；Instrument applied signal voltage VYJ is equal to sensor signal voltage VC.
According to definition: V_I=1/RX then has RX=1/V_I=3k Ω；
Due to constant current output electric current IC=VC/RX；
According to formula (4), VYJ=N*VC, i.e. instrument signal input voltage VYJ are equal to the requirement of sensor signal VC, there is VYJ
=IC*N*RJ=1*VC=IC*RX, obtains:
Instrument input resistance RJ=RX/N=3k Ω；
According to definition: N=RJ/RX is obtained:
Transmission coefficient N=1；
Specific implementation circuit as shown in Figure 7, the design method of voltage current adapter is, by resistors match at identical
Formula: R1/R2=(R31 ∥ R32)/R4=K.
For specific implementation circuit shown in Fig. 7, due to K=R1/R2=1.According to formula (9),
There is X=1/ (1- (K+1) * R32 ∥ R4/ (R31+R32 ∥ R4))/K
=1/ (1- (1+1) * 200k Ω ∥ 120k Ω/(300k Ω+200k Ω ∥ 120k Ω))/1=5/3.
Then Parameter design and computation is:
According to formula (1), there is VX=VG/X=5/5/3=3V,
According to formula (6), there is VJ+N*VG/X=0；
Because instrument has both positive and negative power supply, best operating point, that is, DC input voitage VYZ of instrument input voltage
Optimum value is close to the voltage of ground wire AGND, therefore instrument side has carried out reverse phase processing to the way of output for receiving signal:
VJ=N*VG/X=3V；
It is the simulation result for above-mentioned design shown in Fig. 8, it was demonstrated that: as reference voltage VG=5V, input signal VC=1VP
When, instrument inputs DC input voitage VYZ '=0V, signal input voltage VYJ=1VP contained by VY.Meet design requirement.
Embodiment 4
A kind of adjustment of sensitivity and intermittent current transmission method of current transmission signal, in order to overcome external disturbance radiator
To the distribution capacity between the transmission line of electric current transmission to electric current transmission line radiation interference, characterized in that voltage and current
Electric current transmission line between converter A and current-to-voltage convertor B uses shielding line, and the core wire of the shielding line is as transmission electric current
The transmission line of signal, and the shielded layer of the shielding line is opened a way in the one end voltage current adapter A, the other end is converted in Current Voltage
Device B mono- terminates instrumentally line AGND.
Claims (5)
1. the adjustment of sensitivity and intermittent current transmission method of a kind of current transmission signal, it is characterized in that: using generalized resonance,
Resonance demodulation technique carries out rotating machinery in the system of fault diagnosis, and by sensor signal voltage VC, interference-free is passed
Defeated to arrive the detecting instrument that there is connection grounding wire impedance R between sensor, using voltage current adapter A, voltage and current turns
Coefficient V_I=1/RX is changed, sensor signal voltage VC is converted into continuous current IC, IC=VC*V_I=VC/RX, in formula, VC
For the signal voltage of sensor, 1/RX is Voltage to current transducer coefficient；The continuous current IC remote transmission converted is to detector
Device is converted to the continuous current IC of remote transmission using current-to-voltage convertor B, Current Voltage conversion coefficient I_V=RJ
It is equivalent to detecting instrument input voltage VY, the VY=IC*I_V=IC*RJ=VC/RX*RJ for restoring sensor signal voltage VC value,
In formula, IC is continuous current, and RJ is to receive resistance, and VC is the signal voltage of sensor；
When sensor signal voltage VC and voltage current adapter A has the reference voltage VG of reference point of potential G, voltage and current
After the reference voltage VG that the continuous current IC of converter A output is sensor signal voltage VC and potential reference point G is divided to 1/X
The sum of conversion value: IC=VC/RX+VG/RX/X；Reference point of potential J and its reference voltage VJ is had in current-to-voltage convertor B
When, received continuous current IC is converted to the glitch-free detecting instrument input voltage VY=of relative to detecting instrument AGND
IC*RJ+VJ=(VC/RX+VG/RX/X) * RJ+VJ, i.e., instrument input voltage is by signal input voltage VYJ and DC input voitage
VYZ two parts are formed by stacking, i.e. VY=VYJ+VYZ, wherein VYJ=(VC/RX) * RJ, VYZ=(VG/RX/X) * RJ+VJ.
2. the adjustment of sensitivity and intermittent current transmission method of a kind of current transmission signal according to claim 1, special
Sign is, in order to which whether identification sensor accesses detecting instrument, design are as follows: and when being not inserted into sensor, detecting instrument end electric current
The input voltage VY of electric pressure converter B output is equal to the reference voltage VJ of reference point of potential J, and when being inserted into sensor, detector
The DC input voitage VYZ of the input voltage VY of device end current-to-voltage convertor B output is equal to the reference voltage of potential reference point G
VG。
3. the adjustment of sensitivity and intermittent current transmission method of a kind of current transmission signal according to claim 1 or 2,
It is characterized in that, for the reference voltage VG of the potential reference point G of detection sensor, design method are as follows:
The reference voltage VG of potential reference point G is carried out 1/X times of partial pressure and obtains VX by voltage current adapter A, i.e., to potential reference
The downsampling factor of the reference voltage VG of point G is X,
VX=VG/X --- --- (1)；
VX is superimposed with sensor signal voltage VC and is converted to continuous current IC, and Voltage to current transducer coefficient V_I depends on current limliting
Resistance RX, i.e. V_I=1/RX, IC=(VG/X+VC) * V_I=(VG/X+VC)/RX；And the electric current electricity of current-to-voltage convertor B
Conversion coefficient I_V is pressed to depend on receiving the size of resistance RJ；
RJ=N*RX --- --- (2)；
I.e. Current Voltage conversion coefficient is I_V=RJ=N*RX, wherein N is transmission coefficient, is defined as: the one of N=RJ/RX, RJ
End receives IC, another to terminate to reference point of potential J, then there is detecting instrument input voltage VY:
VY=VJ+RJ*IC=VJ+RJ* (VG/X+VC)/RX=VJ+N*RX (VG/X+VC)/RX,
VY=VJ+N* (VG/X+VC) --- --- (3)；
That is: in detecting instrument input voltage VY, the signal input voltage VYJ containing N times of sensor signal voltage VC:
VYJ=N*VC --- --- (4)
With DC input voitage VYZ:
VYZ=VJ+N*VG/X --- --- (5)；
The co-design criterion of the downsampling factor X of detecting instrument reference voltage VJ and reference voltage VG is:
It enables the DC input voitage VYZ of detecting instrument be equal to the reference voltage VG of sensor potential reference point G, is:
VYZ=VJ+N*VG/X=VG,
Then having the design method of VJ is:
VJ=VG-N*VG/X=VG* (X-N)/X --- --- (6)
Wherein, VJ cannot be limited to N≤X less than zero；
When it is VG ' that the reference voltage VG of the potential reference point G of sensor side changes for some reason, just there is the direct current of detecting instrument to input
Voltage VYZ ':
VYZ '=VJ+N*VG '/X --- --- (7)
Then the method for the reference voltage VG ' of the potential reference point G of detection sensor is:
VG '=(VYZ '-VJ) * X/N --- --- (8).
4. the adjustment of sensitivity and intermittent current transmission method of a kind of current transmission signal according to claim 1 or 2,
It is characterized in, the design method of the current-to-voltage convertor B are as follows:
When receiving circuit using inverter cricuit, because circuit has carried out reverse phase, therefore the DC input voitage VYZ ' of detecting instrument:
VYZ '=VJ-N*VG '/X --- --- (10)
When reception circuit does not use negater circuit, the DC input voitage VYZ ' of detecting instrument:
VYZ '=VJ+N*VG '/X --- --- (7)；
In formula, N is transmission coefficient, VG ' is reference voltage.
5. the adjustment of sensitivity and intermittent current transmission method of a kind of current transmission signal according to claim 1 or 2,
Be characterized in, in order to overcome external disturbance radiator to transmit the electric current transmission line between distribution capacity to electric current transmission line
Radiation interference uses shielding line, the shielding to the electric current transmission line between voltage current adapter A and current-to-voltage convertor B
Transmission line of the core wire of line as transmission current signal, and the shielded layer of the shielding line is opened a way in the one end voltage current adapter A,
The other end terminates instrumentally line AGND in current-to-voltage convertor B mono-.
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| CN101710445A (en) * | 2009-12-14 | 2010-05-19 | 哈尔滨工业大学 | Multiparameter remote transmission device based on analog current loop |
| CN102033208A (en) * | 2010-12-03 | 2011-04-27 | 李�真 | Battery detection protection chip |
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| US6803776B2 (en) * | 2002-03-13 | 2004-10-12 | National Research Council Of Canada | Current-comparator-based four-terminal resistance bridge for power frequencies |
| CN101710445A (en) * | 2009-12-14 | 2010-05-19 | 哈尔滨工业大学 | Multiparameter remote transmission device based on analog current loop |
| CN102033208A (en) * | 2010-12-03 | 2011-04-27 | 李�真 | Battery detection protection chip |
| CN202197216U (en) * | 2011-08-09 | 2012-04-18 | 迈鑫科技股份有限公司 | Power supply voltage regulating controller |
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