CN106247915A - A kind of PLCD sensor signal conditioning circuit followed based on peak value and method thereof - Google Patents
A kind of PLCD sensor signal conditioning circuit followed based on peak value and method thereof Download PDFInfo
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Abstract
The invention discloses a kind of PLCD sensor signal conditioning circuit followed based on peak value and method thereof, including sine wave generator circuit, PLCD sensor, preposing signal process circuit, phase discriminator, peak value follower circuit, output processing circuit.Sine wave generator circuit drives the excitation coil of PLCD sensor, the induction coil output signal of PLCD sensor is after preposing signal process circuit, on the one hand phase discriminator it is input to together with the output signal of sine wave generator circuit, it is judged that sensor displacement positive and negative；On the other hand input peak value follower circuit detects the crest voltage of output signal, finally by output processing circuit, obtains representing the voltage signal of displacement size and Orientation.Relative to conventional rectifying and wave-filtering modulate circuit, the present invention is followed by peak value and quickly obtains displacement size, and dynamic characteristic is good, solves the problem that PLCD sensor small-signal near zero-bit is difficult to catch, positive and negative values is difficult to judge in addition.
Description
Technical field
The present invention relates to a kind of PLCD sensor signal conditioning circuit followed based on peak value and method thereof, belong to sensor
Signal processing technology field.
Background technology
Compared to the non-contact displacement transducer LVDT sensor of main flow on market and magnetostrictive displacement sensor,
PLCD sensor has more excellent reliability and adaptability, greater compactness of structure, less expensive cost of manufacture, particularly installs
Easy to use.
Abroad greatly develop on PLCD sensor technology and take its place in the front ranks of the world all the time at present, domestic non-to permanent magnet linear
The research and development of tangent displacement sensor are also in the blank stage, and the Major Difficulties of PLCD sensor production is its output signal
Modulate circuit, therefore, in the urgent need to designing high-performance reliable PLCD sensor signal conditioning circuit.
The design of PLCD sensor signal conditioning circuit it is crucial that obtain the amplitude of induced signal rapidly and accurately, and can sentence
The phase place of break signal.For the detection of electromagnetic induction signal amplitude, the method typically taking precision rectifying, but there is response
Slowly, the problem of poor real.The present invention proposes the PLCD sensor signal conditioning method followed based on peak value, can quickly obtain table
Show the voltage signal of displacement size and Orientation.
The Chinese patent of Publication No. CN 103297005A discloses a kind of peak-detector circuit, and this patent readme can
Working band the quickest, wide and detect crest with low power, but it is only applicable in high frequency linearity system, it is impossible to it is applied to
The low frequency signal crest detection of PLCD sensor.
The Chinese patent of Publication No. CN 201748940U discloses a kind of monolithic processor controlled peak-detector circuit, should
Patent utilizes merely electric capacity to keep voltage can not keep high accuracy, although and utilizing the electric discharge of chip microcontroller electric capacity to reach
To real-time, but cross with loaded down with trivial details, and low amplitude value can not be detected owing to the forward conduction voltage drop of diode limits this patent
Signal.
The Chinese patent of Publication No. CN 202133712U discloses the peak-detector circuit of a kind of integration packaging, and this is special
Profit utilizes logic circuit can reach good real-time, but circuit is the most relatively complicated, and when input signal is with noise
Shi Rongyi causes the false triggering of internal trigger, also cannot detect low amplitude value signal.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the present invention provides a kind of and follows based on peak value
PLCD sensor signal conditioning circuit and method thereof, followed by peak value and quickly obtain displacement size, and dynamic characteristic is good, solves in addition
The problem that PLCD sensor small-signal near zero-bit of having determined is difficult to catch, positive and negative values is difficult to judge.
Technical scheme: for achieving the above object, the technical solution used in the present invention is:
A kind of PLCD sensor signal conditioning circuit followed based on peak value, passes including sine wave generator circuit, PLCD
Sensor, preposing signal process circuit, phase discriminator, peak value follower circuit, output processing circuit；Wherein,
The signal output part of described sine-wave generator respectively with signal input part, the described phase demodulation of described PLCD sensor
The first input end of circuit is connected；
The described signal output part of PLCD sensor is connected with the signal input part of preposing signal process circuit；
Two signal output parts of described preposing signal process circuit respectively with secondary signal input, the institute of described phase discriminator
The first signal input part stating peak value follower circuit is connected；
First signal output part of described phase discriminator is connected with the secondary signal input of described peak value follower circuit；Institute
The signal output part of the secondary signal outfan and described peak value follower circuit of stating phase discriminator processes with described output respectively
Two signal input parts of circuit are connected.
Further, described PLCD sensor is wound on the excitation coil and uniformly at described magnetic core two ends by magnetic core, symmetry
It is wound on the induction coil composition in the middle of described magnetic core；The output signal of the generator circuit of described sine wave is input to described sharp
Encouraging in coil, produce alternating magnetic field and described induction coil is produced excitation, the output signal of described induction coil is connected to described
Preposing signal process circuit is nursed one's health.
Further, described preposing signal process circuit is by low-pass filter circuit, voltage amplifier circuit, voltage offset electric circuit structure
Becoming, the signal output part of described low-pass filter circuit inputs with the signal of described voltage amplifier circuit, voltage offset electric circuit respectively
End connects；
The signal output part of described voltage amplifier circuit connects the hysteresis loop comparator in described phase discriminator；Described voltage is inclined
The signal output part of circuits connects the input of the dual pathways detecting circuit in described peak value follower circuit.
Further, described phase discriminator is made up of two hysteresis loop comparators and a d type flip flop, wherein, and described two
Individual hysteresis loop comparator is respectively a hysteresis loop comparator, No. two hysteresis loop comparators；Described d type flip flop includes two inputs, point
Not Wei D input and input end of clock, also include a Q output, described Q output be described phase discriminator second letter
Number outfan, is connected with the signal input part of described output processing circuit；
The output signal of described sine wave generator circuit is input in a described hysteresis loop comparator, is converted to encourage line
Circle square-wave signal, then it is input to the D input of described d type flip flop；
The voltage amplifier circuit of one of the outfan in described preposing signal process circuit output signal input described No. two stagnant
Return comparator, be converted to induction coil square-wave signal, be on the one hand input to the input end of clock of described d type flip flop, on the other hand
It is input in the logic gating circuit in described peak value follower circuit.
Further, described peak value follower circuit is by dual pathways detecting circuit, logic gating circuit, electromagnetic switch and two poles
Pipe is constituted；
Wherein, described dual pathways detecting circuit, logic gating circuit signal output part all with the letter of described electromagnetic switch
Number input is connected, one of them signal input part phase of the signal output part of described electromagnetic switch and described output processing circuit
Even；Described dual pathways detecting circuit connects described logic gating circuit each via described diode；
The output signal of the voltage offset electric circuit of one of the outfan in described preposing signal process circuit is input to described bilateral
The signal input part of road detecting circuit, is the first signal input part of described peak value follower circuit；Described dual pathways detection electricity
First signal output part on road is crest voltage outfan, the electromagnetic switch described in connection, and secondary signal outfan is for keeping electricity
Hold charge-discharge end, the logic gating circuit described in connection；
Described logic gating circuit is made up of monostable flipflop, flip and flop generator and two AND circuits；Described mirror
The signal that the output signal of No. two hysteresis loop comparators of one of the input in circuitry phase is input to described logic gating circuit is defeated
Enter end, be the signal input part of monostable flipflop and flip and flop generator, be the second letter of described peak value follower circuit
Number input, the Q output of monostable flipflop is connected the signal input of AND circuit with the Q output of flip and flop generator
End, the Q output of monostable flipflop and flip and flop generatorOutfan connects the signal input part of AND circuit, with door
The outfan of circuit is A, B outfan of logic gating circuit.
Further, described output processing circuit is by No. two voltage offset electric circuits, anti-phase scaling circuit and electromagnetism
Switch is sequentially connected with composition, and the output signal of described No. two voltage offset electric circuits is separately input to described anti-phase scaling circuit
And electromagnetic switch；
The output signal end of described peak value follower circuit is connected with described No. two voltage offset electric circuits, described phase discriminator
Secondary signal outfan is input to described No. two electromagnetic switch.
A kind of method of PLCD sensor signal conditioning circuit followed based on peak value, comprises the following steps:
1) sine-wave generator output signal is respectively to phase discriminator and PLCD sensor；
2) the induction coil output signal of PLCD sensor is nursed one's health through preposing signal process circuit, specially two kinds, Yi Zhongwei
The hysteresis ratio that output signal after preposing signal process circuit carries out low-pass filtering and signal amplifies conditioning is input in phase discriminator
Relatively device, another kind of for carrying out low-pass filtering and plus positive bias voltage through preposing signal process circuit, it is input to peak value follower circuit
In obtain having added the crest voltage of bias；
3) phase discriminator is according to the sine-wave generator received and the output signal of preposing signal process circuit, it is judged that PLCD passes
Sensor displacement positive and negative；Output induction coil square-wave signal arrives to peak value follower circuit, output generating positive and negative voltage logic gating signal
In output processing circuit；
4) peak value follower circuit detects the crest voltage of accepted signal, and output result is to output processing circuit；
5) obtain representing the voltage signal of displacement size and Orientation by output processing circuit.
Further, described step 3) in phase discriminator judge the positive and negative of PLCD sensor displacement method particularly includes: when
During the induction coil square-wave signal of the advanced described PLCD sensor of excitation coil square-wave signal phase place of described PLCD sensor, institute
State the Q output output high level of the d type flip flop of PLCD sensor, control output processing circuit gating positive voltage；Swash when described
When encouraging induction coil square-wave signal described in coil square-wave signal delayed phase, the Q output output low level of described d type flip flop,
Control output processing circuit gating negative voltage.
Further, described step 4) in, described peak value follower circuit detects the concrete of the crest voltage of accepted signal
Method is:
4-1) two input signals of described peak value follower circuit are within first cycle, and peak followed by dual pathways detecting circuit
Threshold voltage, wherein,
The A outfan output high level of logic gating circuit, a diode is not turned on, and intercepts corresponding No. two detection electricity
The electric capacity electric discharge on road；
The B outfan output low level of logic gating circuit, No. two diode current flows, make a corresponding detecting circuit
Electric capacity repid discharge resets, and again detects new crest voltage；
The C outfan output high level of logic gating circuit, controls electromagnetic switch No. two detecting circuit output voltages of gating；
4-2) in the next cycle of two input signals, crest voltage followed by dual pathways detecting circuit, wherein,
The A outfan output high level of logic gating circuit, a diode current flow, make corresponding No. two detecting circuits
Electric capacity repid discharge resets, and again detects new crest voltage；
The B outfan output low level of logic gating circuit, No. two diodes are not turned on, and intercept a corresponding detection electricity
The electric capacity electric discharge on road；
The C outfan output high level of logic gating circuit, controls electromagnetic switch No. two detecting circuit output voltages of gating；
Duplicate detection peak voltage in this way, it is achieved quickly follow.
Further, described step 5) in output processing circuit obtain representing the tool of voltage signal of displacement size and Orientation
Body method is:
The signal input part of described output processing circuit arranges No. two voltage offset electric circuits, described No. two voltage offset electric circuits
The crest voltage crossed by forward bias adds the negative bias voltage that size is identical, reduction real peak magnitude of voltage, then passes through anti-phase
Scaling circuit is converted to peak negative voltage equal in magnitude, that symbol is contrary, and both input electromagnetic switch, by phase discriminator
(4) realizing the logic gating of generating positive and negative voltage, output represents the voltage signal of PLCD sensor displacement size and Orientation；
Described No. two voltage offset electric circuits and described step 2) in the acquired crest voltage having added bias i.e. bias
Magnitude of voltage is less than the forward conduction voltage drop of diode, it is ensured that be in the state of lightly conducting during diode operation.
Beneficial effect: a kind of PLCD sensor signal conditioning circuit followed based on peak value of present invention offer and side thereof
Method, compared with prior art, relative to conventional rectifying and wave-filtering modulate circuit, the present invention is followed by peak value and quickly obtains displacement
Size, dynamic characteristic is good, solves that PLCD sensor small-signal near zero-bit is difficult to catch, positive and negative values is difficult to judge in addition
Problem.
Accompanying drawing explanation
Fig. 1 is PLCD Conditioning Circuits of Sensor flow chart；
Fig. 2 is preposing signal process circuit figure；
Fig. 3 is phase discriminator figure；
Fig. 4 is peak value follower circuit figure；
Fig. 5 is output processing circuit figure；
Fig. 6 is logic gating circuit figure
Fig. 7 is Multisim circuit simulation figure.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is further described.
The present invention is a kind of PLCD sensor signal conditioning circuit followed based on peak value and method thereof, can be with the fastest
Speed obtains the virtual value of PLCD sensor output signal, can judge direction of displacement, can detect the small-signal of zero-bit adnexa.This
Bright include sine wave generator circuit, PLCD sensor, preposing signal process circuit, phase discriminator, peak value follower circuit, output process
Circuit.Sine wave generator circuit drives the excitation coil of PLCD sensor, the induction coil output signal warp of PLCD sensor
After crossing preposing signal process circuit, on the one hand it is input to phase discriminator together with the output signal of sine wave generator circuit, it is judged that pass
Sensor displacement positive and negative；On the other hand input peak value follower circuit detects the crest voltage of output signal, finally by output
Process circuit, obtain representing the voltage signal of displacement size and Orientation.Relative to conventional rectifying and wave-filtering modulate circuit, the present invention
Being followed by peak value and quickly obtain displacement size, dynamic characteristic is good, solves PLCD sensor small-signal near zero-bit in addition
The problem being difficult to catch, positive and negative values is difficult to judge.
Particular content is as follows:
As it is shown in figure 1, the PLCD sensor signal conditioning circuit followed based on peak value, its structure includes sine-wave generator
Circuit 1, PLCD sensor 2, preposing signal process circuit 3, phase discriminator 4, peak value follower circuit 5, output processing circuit 6, Qi Zhongzheng
The signal output part of string wave producer 1 is connected with signal input part, the first input end of phase discriminator 4 of PLCD sensor 2,
The signal output part of PLCD sensor 2 is connected with the signal input part of preposing signal process circuit 3, two letters of preposing signal process circuit 3
Number outfan is connected with the secondary signal input of phase discriminator 4, the first signal input part of peak value follower circuit 5 respectively, mirror
First signal output part of circuitry phase 4 is connected with the secondary signal input of peak value follower circuit 5, the second letter of phase discriminator 4
Number outfan is connected with two signal input parts of output processing circuit 6 respectively with the signal output part of peak value follower circuit 5.
PLCD sensor 2 is wound on the excitation coil at magnetic core two ends by magnetic core, symmetry and is uniformly wound in the middle of magnetic core
Induction coil forms, and the output signal of sinusoidal wave generator circuit 1 is input in excitation coil, produces alternating magnetic field to sensing
Coil produces excitation, and the output signal of induction coil is connected in preposing signal process circuit 3 nurse one's health.
Sine wave generator circuit 1 is by RC sine wave oscillation circuit, homophase follow circuit and the OCL electricity eliminating step distortion
Road is constituted, and drives the excitation coil of PLCD sensor 2, to sensing in exportable stable sine wave signal to PLCD sensor 2
Coil encourages, and produces corresponding induction electromotive force.
As in figure 2 it is shown, preposing signal process circuit 3 is by low-pass filter circuit 7, voltage amplifier circuit 8, voltage offset electric circuit 9 structure
Become.The induction coil output signal input preposing signal process circuit 3 of PLCD sensor 2, the most low-pass filtered circuit 7 is to the line of induction
The output signal of circle carries out low-pass filtering, filters out high frequency noise, and filtered signal is amplified the most again by voltage amplifier circuit 8
The hysteresis loop comparator in phase discriminator 4 it is input to, it is ensured that small magnitude signal also is able to be converted into stable square wave, voltage after number
Filtered signal plus positive bias voltage, is input in peak value follower circuit 5 obtain having added bias by biasing circuit 9
Crest voltage, it is ensured that small magnitude signal also can collected peak voltage value.
As it is shown on figure 3, phase discriminator 4 is made up of 10,11 and d type flip flop 12 of two hysteresis loop comparators, sinusoidal wave
The output signal of raw device circuit 1 is input in hysteresis loop comparator 10, is converted to excitation coil square-wave signal, then is input to D triggering
The D input of device 12；The output signal input hysteresis loop comparator 11 of voltage amplifier circuit 8, is converted to induction coil square-wave signal,
On the one hand the clock input CP end of d type flip flop 12, the logic being on the other hand input in peak value follower circuit 5 gating electricity it are input to
In road 15, when excitation coil square-wave signal phase place advanced induction coil square-wave signal, the Q output output height of d type flip flop 12
Level, controls output processing circuit 6 and gates positive voltage；When excitation coil square-wave signal delayed phase induction coil square-wave signal
Time, the Q output output low level of d type flip flop 12, control output processing circuit 6 and gate negative voltage.
As shown in Figure 4, peak value follower circuit 5 by dual pathways detecting circuit 13,14, logic gating circuit 15, electromagnetic switch
16 and diode 17,18 constitute, wherein the first signal output part of detecting circuit 13,14 is crest voltage outfan, second letter
Number outfan is holding capacitor charge-discharge end, and the signal that the output signal of voltage offset electric circuit 9 is input to detecting circuit 13,14 is defeated
Entering end, the output signal of hysteresis loop comparator 11 is input to the signal input part of logic gating circuit 15, exists two input signals
In first cycle, crest voltage followed by detecting circuit 13,14, and A outfan output high level, diode 17 intercepts detecting circuit
The electric capacity electric discharge of 13, B outfan output low level, diode 18 conducting makes the electric capacity repid discharge of detecting circuit 14 reset, weight
The crest voltage that new detection is new, C outfan output high level controls electromagnetic switch 16 and gates detecting circuit 13 output voltage；Two
In the next cycle of individual input signal, detecting circuit 13,14 follows crest voltage, A outfan output low level, diode 17
Conducting makes the electric capacity repid discharge of detecting circuit 13 reset, again detects new crest voltage, and B outfan exports high level, and two
Pole pipe 18 intercepts the electric capacity electric discharge of detecting circuit 14, and C outfan output low level controls electromagnetic switch 16 and gates detecting circuit 14
Output voltage, detects peak voltage, it is achieved quickly follow the most again and again.
As shown in Figure 6, logic gating circuit 15 is by monostable flipflop 22, flip and flop generator 23 and two AND circuits
24,25 are constituted；The output signal of No. two hysteresis loop comparators 11 of one of the input in described phase discriminator 4 is patrolled described in being input to
Collect the signal input part of gating circuit 15, be monostable flipflop 22 and the signal input part of flip and flop generator 23, be
The secondary signal input of described peak value follower circuit 5；The Q output of monostable flipflop 22 and the Q of flip and flop generator 23
Outfan connects the signal input part of AND circuit 24, the Q output of monostable flipflop 22 and flip and flop generator 23Defeated
Going out end and connect the signal input part of AND circuit 25, the outfan of AND circuit 24,25 is A, B output of logic gating circuit
End.
As it is shown in figure 5, output processing circuit 6 is by No. two voltage offset electric circuits 19, anti-phase scaling circuit 20 and electromagnetism
Switch 21 composition, the crest voltage crossed by forward bias of No. two voltage offset electric circuits 19 is electric plus the negative bias that size is identical
Pressure, reduction real peak magnitude of voltage, then be converted to equal in magnitude by anti-phase scaling circuit 20, the peak value that symbol is contrary is born
Voltage, both input electromagnetic switch 21, phase discriminator 4 realize the logic gating of generating positive and negative voltage, output expression PLCD sensor
The voltage signal of displacement size and Orientation.
In view of electric capacity in peak value follower circuit 5 by diode discharge, the forward conduction voltage drop of diode causes little letter
Number the impact that cannot generate electricity of voltage, bias voltage acquired by described voltage offset electric circuit 9 and No. two voltage offset electric circuits 19
Value wants suitable, and excessive bias voltage can cause electric capacity electric discharge too much, by input signal and biasing in follow-up charging process
Voltage charges simultaneously and causes the holding overtension of electric capacity；Too small bias voltage can cause when input signal is less than diode
During forward conduction voltage, diode is not turned on, and owing to input signal is low frequency signal, capacitor discharge time can be long, and impact is real
Time followability；Preferably bias voltage should be slightly less than the forward conduction voltage drop of diode, and when keeping discharging, diode is slight
Conducting such that it is able to small magnitude input signal detected.
Embodiment
Use Multisim software that this PLCD sensor signal conditioning circuit followed based on peak value is emulated, such as figure
Shown in 7.Wherein Lycoperdon polymorphum Vitt fine rule is excitation coil input signal, and black thin is induction coil output signal, and heavy black line is defeated
Go out to process the output signal of circuit 6.Output signal can follow induction coil crest voltage rapidly and accurately, and works as excitation coil
When input signal is ahead of induction coil output signal, final output signal is just；When excitation coil input signal lags behind
During induction coil output signal, final output signal is negative.Show this PLCD sensor signal conditioning followed based on peak value
Circuit can accurately detect and export the voltage signal representing PLCD sensor displacement size and Orientation, keeps good moving simultaneously
State tracking effect.
The above is only the preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For Yuan, under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (10)
1. the PLCD sensor signal conditioning circuit followed based on peak value, it is characterised in that: include sine-wave generator electricity
Road (1), PLCD sensor (2), preposing signal process circuit (3), phase discriminator (4), peak value follower circuit (5), output processing circuit
(6)；Wherein,
The signal output part of described sine-wave generator (1) respectively with signal input part, the described mirror of described PLCD sensor (2)
The first input end of circuitry phase (4) is connected；
The signal output part of described PLCD sensor (2) is connected with the signal input part of preposing signal process circuit (3)；
Two signal output parts of described preposing signal process circuit (3) respectively with the secondary signal input of described phase discriminator (4),
First signal input part of described peak value follower circuit (5) is connected；
First signal output part of described phase discriminator (4) is connected with the secondary signal input of described peak value follower circuit (5)；
The secondary signal outfan of described phase discriminator (4) and the signal output part of described peak value follower circuit (5) are respectively with described
Two signal input parts of output processing circuit (6) are connected.
The PLCD sensor signal conditioning circuit followed based on peak value the most according to claim 1, it is characterised in that: described
PLCD sensor (2) is wound on the excitation coil at described magnetic core two ends by magnetic core, symmetry and is uniformly wound in the middle of described magnetic core
Induction coil composition；The output signal of the generator circuit (1) of described sine wave is input in described excitation coil, produces and hands over
Varying magnetic field produces excitation to described induction coil, and the output signal of described induction coil is connected to described preposing signal process circuit (3)
In nurse one's health.
The PLCD sensor signal conditioning circuit followed based on peak value the most according to claim 1, it is characterised in that: described
Preposing signal process circuit (3) is made up of low-pass filter circuit (7), voltage amplifier circuit (8), voltage offset electric circuit (9), described low pass
The signal output part of filter circuit (7) respectively with described voltage amplifier circuit (8), the signal input part of voltage offset electric circuit (9)
Connect；
The signal output part of described voltage amplifier circuit (8) connects the hysteresis loop comparator in described phase discriminator (4)；Described voltage
The signal output part of biasing circuit (9) connects the input of the dual pathways detecting circuit (13,14) in described peak value follower circuit (5)
End.
The PLCD sensor signal conditioning circuit followed based on peak value the most according to claim 1, it is characterised in that: described
Phase discriminator (4) be made up of two hysteresis loop comparators (10,11) and a d type flip flop (12), wherein, said two hysteresis ratio
Relatively device (10,11) is respectively hysteresis loop comparator (10), No. two hysteresis loop comparators (11)；Described d type flip flop (12) includes two
Individual input, respectively D input and input end of clock, also include a Q output, described Q output is described phase demodulation
The secondary signal outfan of circuit (4), is connected with the signal input part of described output processing circuit (6)；
The output signal of described sine wave generator circuit (1) is input in a described hysteresis loop comparator (10), is converted to swash
Encourage coil square-wave signal, then be input to the D input of described d type flip flop (12)；
The output signal of the voltage amplifier circuit (8) of one of the outfan in described preposing signal process circuit (3) inputs described No. two
Hysteresis loop comparator (11), is converted to induction coil square-wave signal, is on the one hand input to the clock input of described d type flip flop (12)
End, is on the other hand input in the logic gating circuit (15) in described peak value follower circuit (5).
The PLCD sensor signal conditioning circuit followed based on peak value the most according to claim 1, it is characterised in that: described
Peak value follower circuit (5) is by dual pathways detecting circuit (13,14), logic gating circuit (15), electromagnetic switch (16) and diode
(17,18) are constituted；
Wherein, described dual pathways detecting circuit (13,14), the signal output part of logic gating circuit (15) are all opened with described electromagnetism
The signal input part closing (16) is connected, its of the signal output part of described electromagnetic switch (16) and described output processing circuit (6)
In signal input part be connected；Described dual pathways detecting circuit (13,14) connects institute each via described diode (17,18)
State logic gating circuit (15)；
The output signal of the voltage offset electric circuit (9) of one of the outfan in described preposing signal process circuit (3) is input to described double
The signal input part of passage detecting circuit (13,14), is the first signal input part of described peak value follower circuit (5)；Described
First signal output part of dual pathways detecting circuit (13,14) is crest voltage outfan, the electromagnetic switch (16) described in connection,
Secondary signal outfan is holding capacitor charge-discharge end, the logic gating circuit (15) described in connection；
Described logic gating circuit (15) by monostable flipflop (22), flip and flop generator (23) and two AND circuits (24,
25) constitute；The output signal of No. two hysteresis loop comparators (11) of one of the input in described phase discriminator (4) is input to described
The signal input part of logic gating circuit (15), is the signal input of monostable flipflop (22) and flip and flop generator (23)
End, is the secondary signal input of described peak value follower circuit (5)；The Q output of monostable flipflop (22) and bistable state
The Q output of trigger (23) connects the signal input part of AND circuit (24), and the Q output of monostable flipflop (22) is with double
Steady state trigger (23)Outfan connects the signal input part of AND circuit (25), and the outfan of AND circuit (24,25) is i.e.
A, B outfan for logic gating circuit.
The PLCD sensor signal conditioning circuit followed based on peak value the most according to claim 1, it is characterised in that: described
Output processing circuit (6) by No. two voltage offset electric circuits (19), anti-phase scaling circuit (20) and No. two electromagnetic switch
(21) being sequentially connected with composition, the output signal of described No. two voltage offset electric circuits (19) is separately input to described anti-phase scale operation
Circuit (20) and No. two electromagnetic switch (21)；
The output signal end of described peak value follower circuit (5) is connected with described No. two voltage offset electric circuits (19), described phase demodulation electricity
The secondary signal outfan on road (4) is input to described No. two electromagnetic switch (21).
7. the method for the PLCD sensor signal conditioning circuit followed based on peak value, it is characterised in that: comprise the following steps:
1) sine-wave generator (1) output signal is respectively to phase discriminator (4) and PLCD sensor (2)；
2) the induction coil output signal of PLCD sensor (2) is nursed one's health through preposing signal process circuit (3), specially two kinds, a kind of
It is input in phase discriminator (4) for the output signal after preposing signal process circuit (3) carries out low-pass filtering and signal amplifies conditioning
Hysteresis loop comparator, another kind of for carrying out low-pass filtering and plus positive bias voltage through preposing signal process circuit (3), be input to peak
Value follow circuit obtains having added the crest voltage of bias in (5)；
3) phase discriminator (4) is according to the sine-wave generator (1) received and the output signal of preposing signal process circuit (3), it is judged that
PLCD sensor displacement positive and negative；Output induction coil square-wave signal is to peak value follower circuit (5), output generating positive and negative voltage logic choosing
Messenger is in output processing circuit (6)；
4) peak value follower circuit (5) detects the crest voltage of accepted signal, and output result is to output processing circuit (6)；
5) obtain representing the voltage signal of displacement size and Orientation by output processing circuit (6).
The method of the PLCD sensor signal conditioning circuit followed based on peak value the most according to claim 7, its feature exists
In described step 3) in phase discriminator (4) judge the positive and negative of PLCD sensor displacement method particularly includes: when described PLCD senses
During the induction coil square-wave signal of the advanced described PLCD sensor (2) of excitation coil square-wave signal phase place of device (2), described PLCD
The Q output output high level of the d type flip flop (12) of sensor (2), controls output processing circuit (6) gating positive voltage；Work as institute
When stating induction coil square-wave signal described in excitation coil square-wave signal delayed phase, the Q output output of described d type flip flop (12)
Low level, controls output processing circuit (6) gating negative voltage.
The method of the PLCD sensor signal conditioning circuit followed based on peak value the most according to claim 7, its feature exists
In: described step 4) in, described peak value follower circuit (5) detects the crest voltage of accepted signal method particularly includes:
4-1) two input signals of described peak value follower circuit (5) are within first cycle, dual pathways detecting circuit (13,14)
Follow crest voltage, wherein,
The A outfan output high level of logic gating circuit (15), a diode (17) is not turned on, and intercepts corresponding No. two inspections
The electric capacity electric discharge of wave circuit (14)；
The B outfan output low level of logic gating circuit (15), No. two diode (18) conductings, make a corresponding detection electricity
The electric capacity repid discharge on road (13) resets, and again detects new crest voltage；
The C outfan output high level of logic gating circuit (15), controls electromagnetic switch (16) No. two detecting circuits (13) of gating
Output voltage；
4-2) in the next cycle of two input signals, crest voltage followed by dual pathways detecting circuit (13,14), wherein,
The A outfan output high level of logic gating circuit (15), diode (17) conducting, make corresponding No. two detection electricity
The electric capacity repid discharge on road (14) resets, and again detects new crest voltage；
The B outfan output low level of logic gating circuit (15), No. two diodes (18) are not turned on, and intercept a corresponding inspection
The electric capacity electric discharge of wave circuit (13)；
The C outfan output high level of logic gating circuit (15), controls electromagnetic switch (16) No. two detecting circuits (13) of gating
Output voltage；
Duplicate detection peak voltage in this way, it is achieved quickly follow.
The method of the PLCD sensor signal conditioning circuit followed based on peak value the most according to claim 7, its feature exists
In described step 5) in output processing circuit (6) obtain representing the voltage signal of displacement size and Orientation method particularly includes:
The signal input part of described output processing circuit (6) arranges No. two voltage offset electric circuits (19), described No. two voltage bias
The crest voltage that forward bias is crossed by circuit (19), plus the identical negative bias voltage of size, reduces real peak magnitude of voltage, then
Being converted to peak negative voltage equal in magnitude, that symbol is contrary by anti-phase scaling circuit (20), both input No. two electromagnetism
Switch (21), is realized the logic gating of generating positive and negative voltage by phase discriminator (4), and output represents PLCD sensor displacement size and Orientation
Voltage signal；
Described No. two voltage offset electric circuits (19) and described step 2) in the acquired crest voltage having added bias i.e. bias
Magnitude of voltage is less than the forward conduction voltage drop of diode (17,18), it is ensured that be in the shape of lightly conducting during diode (17,18) work
State.
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