CN106247915B - A kind of PLCD sensor signal conditioning circuits followed based on peak value and its method - Google Patents
A kind of PLCD sensor signal conditioning circuits followed based on peak value and its method Download PDFInfo
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Abstract
The invention discloses a kind of PLCD sensor signal conditioning circuits followed based on peak value and its methods, including sine wave generator circuit, PLCD sensors, preposing signal process circuit, phase discriminator, peak value follower circuit, output processing circuit.Sine wave generator circuit drives the excitation coil of PLCD sensors, the induction coil output signal of PLCD sensors is after preposing signal process circuit, on the one hand it is input to phase discriminator together with the output signal of sine wave generator circuit, judges the positive and negative of sensor displacement；On the other hand input peak value follower circuit detects the crest voltage of output signal, finally by output processing circuit, obtains the voltage signal for indicating displacement and direction.Relative to conventional rectifying and wave-filtering modulate circuit, the present invention is followed by peak value is quickly obtained displacement, and dynamic characteristic is good, solves the problems, such as that PLCD sensors small signal near zero-bit is difficult to capture, positive and negative values are difficult to judge in addition.
Description
Technical field
The present invention relates to a kind of PLCD sensor signal conditioning circuits followed based on peak value and its methods, belong to sensor
Signal processing technology field.
Background technology
Compared to the non-contact displacement transducer LVDT sensors and magnetostrictive displacement sensor of mainstream in the market,
PLCD sensors possess more excellent reliability and adaptability, greater compactness of structure, and less expensive cost of manufacture is especially installed
It is easy to use.
Foreign countries greatly develop on PLCD sensor technologies and take its place in the front ranks of the world always at present, domestic non-to permanent magnet linear
The research and development of tangent displacement sensor are also in blank stage, and the Major Difficulties of PLCD sensor productions are its output signal
Modulate circuit, therefore, there is an urgent need to design the reliable PLCD sensor signal conditioning circuits of high-performance.
The key of PLCD sensor signal conditioning circuits design is rapidly and accurately to obtain the amplitude of inductive signal, and can sentence
The phase of break signal.Detection for electromagnetic induction signal amplitude, the method for generally taking precision rectifying, but there is response
Slowly, the problem of real-time difference.The present invention proposes the PLCD sensor signal conditioning methods followed based on peak value, can be quickly obtained table
Show the voltage signal in displacement and direction.
The Chinese patent of Publication No. CN 103297005A discloses a kind of peak-detector circuit, which can
It is linear quickly, wide working band and detect wave crest with low power, but it is only applicable in high frequency linearity system, can not be applied to
The low frequency signal wave crest of PLCD sensors detects.
The Chinese patent of Publication No. CN 201748940U discloses a kind of monolithic processor controlled peak-detector circuit, should
Patent utilizes capacitance to keep voltage that cannot keep high-precision merely, although and can be reached using the electric discharge of chip microcontroller capacitance
To real-time, but cross with it is cumbersome, and cannot detect low amplitude value since the forward conduction voltage drop of diode limits the patent
Signal.
The Chinese patent of Publication No. CN 202133712U discloses a kind of peak-detector circuit of integration packaging, this is specially
Profit can reach good real-time using logic circuit, but circuit is still relatively complicated, and when input signal carries noise
When easily cause the false triggering of internal trigger, can not also detect value signal by a narrow margin.
Invention content
Goal of the invention：In order to overcome the deficiencies in the prior art, the present invention provides a kind of to be followed based on peak value
PLCD sensor signal conditioning circuits and its method are followed by peak value and are quickly obtained displacement, and dynamic characteristic is good, solves in addition
The problem of PLCD sensors small signal near zero-bit of having determined is difficult to capture, positive and negative values are difficult to judge.
Technical solution：To achieve the above object, the technical solution adopted by the present invention is：
A kind of PLCD sensor signal conditioning circuits followed based on peak value, including sine wave generator circuit, PLCD are passed
Sensor, preposing signal process circuit, phase discriminator, peak value follower circuit, output processing circuit；Wherein,
The signal output end of the sine-wave generator respectively with the signal input part of the PLCD sensors, the phase demodulation
The first input end of circuit is connected；
The signal output end of the PLCD sensors is connected with the signal input part of preposing signal process circuit；
Two signal output ends of the preposing signal process circuit respectively with the second signal input terminal of the phase discriminator, institute
The first signal input part for stating peak value follower circuit is connected；
First signal output end of the phase discriminator is connected with the second signal input terminal of the peak value follower circuit；Institute
The signal output end of the second signal output end and the peak value follower circuit of stating phase discriminator is respectively handled with the output
Two signal input parts of circuit are connected.
Further, the PLCD sensors be wound on by magnetic core, symmetrically the magnetic core both ends excitation coil and uniformly
The induction coil composition being wound among the magnetic core；The output signal of the generator circuit of the sine wave is input to described sharp
It encourages in coil, generates alternating magnetic field and excitation is generated to the induction coil, the output signal of the induction coil is connected to described
It is improved in preposing signal process circuit.
Further, the preposing signal process circuit is by low-pass filter circuit, voltage amplifier circuit, voltage offset electric circuit structure
At the signal output end of the low-pass filter circuit is inputted with the signal of the voltage amplifier circuit, voltage offset electric circuit respectively
End connection；
The signal output end of the voltage amplifier circuit connects the hysteresis loop comparator in the phase discriminator；The voltage is inclined
The signal output end of circuits connects the input terminal of the binary channels detecting circuit in the peak value follower circuit.
Further, the phase discriminator is made of two hysteresis loop comparators and a d type flip flop, wherein described two
A hysteresis loop comparator is respectively No.1 hysteresis loop comparator, No. two hysteresis loop comparators；The d type flip flop includes two input terminals, point
Not Wei D input terminals and input end of clock, further include a Q output, the Q output is the second letter of the phase discriminator
Number output end, connect with the signal input part of the output processing circuit；
The output signal of the sine wave generator circuit is input in the No.1 hysteresis loop comparator, is converted to excitation line
Square-wave signal is enclosed, then is input to the D input terminals of the d type flip flop；
Described No. two of the output signal input of the voltage amplifier circuit of one of output end in the preposing signal process circuit is stagnant
Comparator is returned, induction coil square-wave signal is converted to, is on the one hand input to the input end of clock of the d type flip flop, on the other hand
It is input in the logic gating circuit in the peak value follower circuit.
Further, the peak value follower circuit is by binary channels detecting circuit, logic gating circuit, electromagnetic switch and two poles
Pipe is constituted；
Wherein, letter of the signal output end of the binary channels detecting circuit, logic gating circuit with the electromagnetic switch
Number input terminal is connected, one of the signal output end of the electromagnetic switch and the output processing circuit signal input part phase
Even；The binary channels detecting circuit connects the logic gating circuit each by the diode；
The output signal of the voltage offset electric circuit of one of output end in the preposing signal process circuit is input to the bilateral
The signal input part of road detecting circuit, the first signal input part of the as described peak value follower circuit；The binary channels detection electricity
First signal output end on road is crest voltage output end, connects the electromagnetic switch, and second signal output end is to keep electricity
Hold charge-discharge end, connects the logic gating circuit；
The logic gating circuit is made of monostable flipflop, flip and flop generator and two AND gate circuits；The mirror
The signal that the output signal of No. two hysteresis loop comparators of one of the input terminal in circuitry phase is input to the logic gating circuit is defeated
Enter end, the as signal input part of monostable flipflop and flip and flop generator, the second letter of the as described peak value follower circuit
The signal of number input terminal, the Q output of monostable flipflop and the Q output connection AND gate circuit of flip and flop generator inputs
End, the Q output of monostable flipflop and flip and flop generatorOutput end connects the signal input part of AND gate circuit, with door
The output end of circuit is A, B output end of logic gating circuit.
Further, the output processing circuit is by No. two voltage offset electric circuits, reverse phase scaling circuit and electromagnetism
Switch is sequentially connected composition, and the output signal of No. two voltage offset electric circuits is separately input to the reverse phase scaling circuit
And electromagnetic switch；
The output signal end of the peak value follower circuit is connect with No. two voltage offset electric circuits, the phase discriminator
Second signal output end is input to No. two electromagnetic switch.
A method of based on the PLCD sensor signal conditioning circuits that peak value follows, include the following steps：
1) sine-wave generator output signal is respectively to phase discriminator and PLCD sensors；
2) the induction coil output signal of PLCD sensors is improved by preposing signal process circuit, specially two kinds, Yi Zhongwei
Output signal after preposing signal process circuit carries out low-pass filtering and signal amplification conditioning is input to the ratio of the hysteresis in phase discriminator
Compared with device, another kind to carry out low-pass filtering through preposing signal process circuit and plus positive bias voltage, is input to peak value follower circuit
In added the crest voltage of bias；
3) phase discriminator judges that PLCD is passed according to the sine-wave generator received and the output signal of preposing signal process circuit
Sensor displacement it is positive and negative；Induction coil square-wave signal is exported to peak value follower circuit, output generating positive and negative voltage logic gating signal arrives
In output processing circuit；
4) peak value follower circuit detects the crest voltage of received signal, exports result to output processing circuit；
5) obtain indicating the voltage signal of displacement and direction by output processing circuit.
Further, phase discriminator judges that the positive and negative specific method of PLCD sensor displacements is in the step 3)：When
The excitation coil square-wave signal phase of the PLCD sensors in advance the induction coil square-wave signal of the PLCD sensors when, institute
The Q output output high level of the d type flip flop of PLCD sensors is stated, control output processing circuit gates positive voltage；Swash when described
When encouraging induction coil square-wave signal described in coil square-wave signal delayed phase, the Q output of the d type flip flop exports low level,
It controls output processing circuit and gates negative voltage.
Further, in the step 4), the peak value follower circuit detects the specific of the crest voltage of received signal
Method is：
4-1) for two input signals of the peak value follower circuit in a cycle, binary channels detecting circuit follows peak
Threshold voltage, wherein
The A output ends of logic gating circuit export high level, and No.1 diode is not turned on, and obstruct corresponding No. two detection electricity
The capacitance on road discharges；
The B output ends of logic gating circuit export low level, and No. two diode current flows make corresponding No.1 detecting circuit
Capacitance repid discharge resets, and detects new crest voltage again；
The C output ends of logic gating circuit export high level, and control electromagnetic switch gates No. two detecting circuit output voltages；
4-2) in the next cycle of two input signals, binary channels detecting circuit follows crest voltage, wherein
The A output ends of logic gating circuit export high level, and No.1 diode current flow makes corresponding No. two detecting circuits
Capacitance repid discharge resets, and detects new crest voltage again；
The B output ends of logic gating circuit export low level, and No. two diodes are not turned on, and obstruct corresponding No.1 detection electricity
The capacitance on road discharges；
The C output ends of logic gating circuit export high level, and control electromagnetic switch gates No. two detecting circuit output voltages；
Detection peak voltage is repeated by this method, and realization quickly follows.
Further, output processing circuit obtains indicating the tool of the voltage signal in displacement and direction in the step 5)
Body method is：
No. two voltage offset electric circuits, No. two voltage offset electric circuits is arranged in the signal input part of the output processing circuit
The crest voltage that forward bias is crossed adds the identical negative bias voltage of size, restores real peak voltage value, then pass through reverse phase
Scaling circuit is converted to peak negative voltage equal in magnitude, that symbol is opposite, and the two inputs electromagnetic switch, by phase discriminator
(4) realize that the logic gating of generating positive and negative voltage, output indicate the voltage signal of PLCD sensor displacement size and Orientations；
The acquired crest voltage for having added bias biases in No. two voltage offset electric circuits and the step 2)
Voltage value is less than the forward conduction voltage drop of diode, and the state of lightly conducting is in when ensure that diode operation.
Advantageous effect：A kind of PLCD sensor signal conditioning circuits followed based on peak value provided by the invention and its side
Method, compared with prior art, relative to conventional rectifying and wave-filtering modulate circuit, the present invention is followed by peak value and is quickly obtained displacement
Size, dynamic characteristic is good, solves that PLCD sensors small signal near zero-bit is difficult to capture, positive and negative values are difficult to judge in addition
Problem.
Description of the drawings
Fig. 1 is PLCD Conditioning Circuits of Sensor flow charts；
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 figures.
Specific implementation mode
The present invention is further described below in conjunction with the accompanying drawings.
The present invention be a kind of PLCD sensor signal conditioning circuits followed based on peak value and its method, can be with most fast
Speed obtains the virtual value of PLCD sensor output signals, can judge direction of displacement, can detect the small signal of zero-bit attachment.This hair
Bright includes sine wave generator circuit, PLCD sensors, preposing signal process circuit, phase discriminator, peak value follower circuit, output processing
Circuit.Sine wave generator circuit drives the excitation coil of PLCD sensors, the induction coil output signal warp of PLCD sensors
After crossing preposing signal process circuit, it is on the one hand input to phase discriminator together with the output signal of sine wave generator circuit, judges to pass
Sensor displacement it is 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 the voltage signal for indicating displacement and direction.Relative to conventional rectifying and wave-filtering modulate circuit, the present invention
It is followed by peak value and is quickly obtained displacement, dynamic characteristic is good, solves PLCD sensors small signal near zero-bit in addition
It is difficult to capture, the problem of positive and negative values are difficult to judge.
Particular content is as follows：
As shown in Figure 1, based on the PLCD sensor signal conditioning circuits that peak value follows, structure includes sine-wave generator
Circuit 1, PLCD sensors 2, preposing signal process circuit 3, phase discriminator 4, peak value follower circuit 5, output processing circuit 6, wherein just
The signal output end of string wave producer 1 is connected with the first input end of the signal input part of PLCD sensors 2, phase discriminator 4,
The signal output end of PLCD sensors 2 is connected with the signal input part of preposing signal process circuit 3, two letters of preposing signal process circuit 3
Number output end is connected with the first signal input part of the second signal input terminal of phase discriminator 4, peak value follower circuit 5 respectively, reflects
First signal output end of circuitry phase 4 is connected with the second signal input terminal of peak value follower circuit 5, the second letter of phase discriminator 4
Number output end and the signal output end of peak value follower circuit 5 are connected with two signal input parts of output processing circuit 6 respectively.
PLCD sensors 2 by magnetic core, symmetrical be wound on the excitation coil at magnetic core both ends and be uniformly wound among magnetic core
Induction coil forms, and the output signal of the generator circuit 1 of sine wave is input in excitation coil, generates alternating magnetic field to induction
Coil generates excitation, and the output signal of induction coil, which is connected in preposing signal process circuit 3, to be improved.
Sine wave generator circuit 1 is by RC sine wave oscillation circuits, the same OCL electricity for mutually following circuit and eliminating step distortion
Road is constituted, the excitation coil of driving PLCD sensors 2 in the sine wave signal to PLCD sensors 2 of exportable stabilization, to induction
Coil generates corresponding induced electromotive force into row energization.
As shown in Fig. 2, preposing signal process circuit 3 is by low-pass filter circuit 7, voltage amplifier circuit 8,9 structure of voltage offset electric circuit
At.The induction coil output signals of PLCD sensors 2 inputs preposing signal process circuit 3, and low-pass filtered circuit 7 is to the line of induction first
The output signal of circle carries out low-pass filtering, filters out high frequency noise, and voltage amplifier circuit 8 is appropriate again by the amplification of filtered signal
The hysteresis loop comparator being input to after number in phase discriminator 4 ensure that small size value signal can also be converted into stable square wave, voltage
Filtered signal is added positive bias voltage by biasing circuit 9, is input in peak value follower circuit 5 and has been added bias
Crest voltage ensure that small size value signal can also be collected peak voltage value.
As shown in figure 3, phase discriminator 4 is made of two hysteresis loop comparators 10,11 and a d type flip flop 12, sine wave hair
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 triggerings
The D input terminals of device 12；The output signal of voltage amplifier circuit 8 inputs hysteresis loop comparator 11, is converted to induction coil square-wave signal,
On the one hand the ends clock input CP of d type flip flop 12 are input to, the logic gating electricity being on the other hand input in peak value follower circuit 5
In road 15, when the advanced induction coil square-wave signal of excitation coil square-wave signal phase, the Q output output of d type flip flop 12 is high
Level, control output processing circuit 6 gate positive voltage；When excitation coil square-wave signal delayed phase induction coil square-wave signal
When, the Q output of d type flip flop 12 exports low level, and control output processing circuit 6 gates negative voltage.
As shown in figure 4, peak value follower circuit 5 is by binary channels detecting circuit 13,14, logic gating circuit 15, electromagnetic switch
16 and diode 17,18 constitute, wherein the first signal output end of detecting circuit 13,14 be crest voltage output end, second letter
Number output end 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
Enter end, the output signal of hysteresis loop comparator 11 is input to the signal input part of logic gating circuit 15, exists in two input signals
In a cycle, detecting circuit 13,14 follows crest voltage, A output ends to export high level, and diode 17 obstructs detecting circuit
13 capacitance electric discharge, B output ends export low level, and the conducting of diode 18 makes the capacitance repid discharge of detecting circuit 14 reset, weight
New crest voltage is newly detected, C output ends export high level control electromagnetic switch 16 and gate 13 output voltage of detecting circuit；Two
In the next cycle of a input signal, detecting circuit 13,14 follows crest voltage, A output ends to export low level, diode 17
Conducting makes the capacitance repid discharge of detecting circuit 13 reset, detects new crest voltage again, B output ends output high level, and two
Pole pipe 18 obstructs the capacitance electric discharge of detecting circuit 14, and C output ends export low level control electromagnetic switch 16 and gate detecting circuit 14
Output voltage, detects peak voltage again and again by this method, and realization quickly follows.
As shown in fig. 6, logic gating circuit 15 is by monostable flipflop 22, flip and flop generator 23 and two AND gate circuits
24, it 25 constitutes；The output signal of No. two hysteresis loop comparators 11 of one of the input terminal in the phase discriminator 4 is input to described patrol
The signal input part of gating circuit 15, the as signal input part of monostable flipflop 22 and flip and flop generator 23 are collected, as
The second signal input terminal of the peak value follower circuit 5；The Q of the Q output and flip and flop generator 23 of monostable flipflop 22
Output end connects the signal input part of AND gate circuit 24, Q output and the flip and flop generator 23 of monostable flipflop 22It is defeated
Outlet connects the signal input part of AND gate circuit 25, and the output end of AND gate circuit 24,25 is A, B output of logic gating circuit
End.
As shown in figure 5, output processing circuit 6 is by No. two voltage offset electric circuits 19, reverse phase scaling circuit 20 and electromagnetism
Switch 21 is constituted, and the crest voltage for crossing forward bias of No. two voltage offset electric circuits 19 is plus the identical negative bias electricity of size
Pressure restores real peak voltage value, then is converted to by reverse phase scaling circuit 20 equal in magnitude, and the opposite peak value of symbol is negative
Voltage, the two input electromagnetic switch 21, realize that the logic of generating positive and negative voltage gates by phase discriminator 4, output indicates PLCD sensors
The voltage signal of displacement and direction.
In view of capacitance leads to small letter by diode discharge, the forward conduction voltage drop of diode in peak value follower circuit 5
Number the influence that can not generate electricity of voltage, bias voltage acquired by the voltage offset electric circuit 9 and No. two voltage offset electric circuits 19
Value is suitable, and excessive bias voltage can cause capacitance electric discharge excessive, by input signal and biasing in subsequent charging process
Voltage charges simultaneously leads to the holding overtension of capacitance；Too small bias voltage can cause to be less than diode when input signal
When forward conduction voltage, diode is not turned on, and since input signal is low frequency signal, capacitor discharge time can be long, influences reality
When followability；Ideal bias voltage should be slightly less than the forward conduction voltage drop of diode, and diode is pico- when keeping discharging
Conducting, so as to detect small magnitude input signal.
Embodiment
This is emulated based on the PLCD sensor signal conditioning circuits that peak value follows using Multisim softwares, is such as schemed
Shown in 7.Wherein grey filament is excitation coil input signal, and black thin is induction coil output signal, and heavy black line is defeated
Go out the output signal of processing circuit 6.Output signal can rapidly and accurately follow induction coil crest voltage, and work 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
When induction coil output signal, final output signal is negative.Show the PLCD sensor signal conditionings followed based on peak value
Circuit can be detected accurately and export the voltage signal for indicating PLCD sensor displacement size and Orientations, while keep good dynamic
State tracking effect.
The above is only a preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (6)
1. a kind of PLCD sensor signal conditioning circuits followed based on peak value, it is characterised in that：Including sine-wave generator electricity
Road（1）, PLCD sensors（2）, preposing signal process circuit（3）, phase discriminator（4）, peak value follower circuit（5）, output processing circuit
（6）；Wherein,
The sine-wave generator（1）Signal output end respectively with the PLCD sensors（2）Signal input part, the mirror
Circuitry phase（4）First input end be connected；
The PLCD sensors（2）Signal output end and preposing signal process circuit（3）Signal input part be connected；
The preposing signal process circuit（3）Two signal output ends respectively with the phase discriminator（4）Second signal input terminal,
The peak value follower circuit（5）The first signal input part be connected；
The phase discriminator（4）The first signal output end and the peak value follower circuit（5）Second signal input terminal be connected；
The phase discriminator（4）Second signal output end and the peak value follower circuit（5）Signal output end respectively with it is described
Output processing circuit（6）Two signal input parts be connected；
The preposing signal process circuit（3）By low-pass filter circuit（7）, voltage amplifier circuit（8）, voltage offset electric circuit（9）It constitutes,
The low-pass filter circuit（7）Signal output end respectively with the voltage amplifier circuit（8）, voltage offset electric circuit（9）Letter
The connection of number input terminal；
The voltage amplifier circuit（8）Signal output end connect the phase discriminator（4）In hysteresis loop comparator；The voltage
Biasing circuit（9）Signal output end connect the peak value follower circuit（5）In binary channels detecting circuit（13,14）Input
End；
The phase discriminator（4）By two hysteresis loop comparators（10,11）With a d type flip flop（12）It constitutes, wherein described two
A hysteresis loop comparator（10,11）Respectively No.1 hysteresis loop comparator（10）, No. two hysteresis loop comparators（11）；The d type flip flop
（12）Further include a Q output including two input terminals, respectively D input terminals and input end of clock, the Q output is
For the phase discriminator（4）Second signal output end, with the output processing circuit（6）Signal input part connection；
The sine wave generator circuit（1）Output signal be input to the No.1 hysteresis loop comparator（10）In, it is converted to sharp
Coil square-wave signal is encouraged, then is input to the d type flip flop（12）D input terminals；
The preposing signal process circuit（3）In one of output end voltage amplifier circuit（8）Output signal input it is described No. two
Hysteresis loop comparator（11）, induction coil square-wave signal is converted to, the d type flip flop is on the one hand input to（12）Clock input
End, is on the other hand input to the peak value follower circuit（5）In logic gating circuit（15）In；
The peak value follower circuit（5）By binary channels detecting circuit（13,14）, logic gating circuit（15）, electromagnetic switch（16）
And diode（17,18）It constitutes；
Wherein, the binary channels detecting circuit（13,14）, logic gating circuit（15）Signal output end opened with the electromagnetism
It closes（16）Signal input part be connected, the electromagnetic switch（16）Signal output end and the output processing circuit（6）Its
In signal input part be connected；The binary channels detecting circuit（13,14）Each by the diode（17,18）Connection institute
State logic gating circuit（15）；
The preposing signal process circuit（3）In one of output end voltage offset electric circuit（9）Output signal be input to it is described double
Channel detecting circuit（13,14）Signal input part, the as described peak value follower circuit（5）The first signal input part；It is described
Binary channels detecting circuit（13,14）The first signal output end be crest voltage output end, connect the electromagnetic switch（16）,
Second signal output end is holding capacitor charge-discharge end, connects the logic gating circuit（15）；
The logic gating circuit（15）By monostable flipflop（22）, flip and flop generator（23）With two AND gate circuits（24,
25）It constitutes；The phase discriminator（4）In one of input terminal No. two hysteresis loop comparators（11）Output signal be input to it is described
Logic gating circuit（15）Signal input part, as monostable flipflop（22）And flip and flop generator（23）Signal input
End, the as described peak value follower circuit（5）Second signal input terminal；Monostable flipflop（22）Q output and bistable state
Trigger（23）Q output connect AND gate circuit（24）Signal input part, monostable flipflop（22）Q output with it is double
Steady state trigger（23）'sOutput end connects AND gate circuit（25）Signal input part, AND gate circuit（24,25）Output end
As A, B output end of logic gating circuit；
The output processing circuit（6）By No. two voltage offset electric circuits（19）, reverse phase scaling circuit（20）With No. two electricity
Magnetic switch（21）It is sequentially connected composition, No. two voltage offset electric circuits（19）Output signal be separately input to the reverse phase ratio
Example computing circuit（20）With No. two electromagnetic switch（21）；
The peak value follower circuit（5）Output signal end and No. two voltage offset electric circuits（19）Connection, the phase demodulation electricity
Road（4）Second signal output end be input to No. two electromagnetic switch（21）.
2. the PLCD sensor signal conditioning circuits according to claim 1 followed based on peak value, it is characterised in that：It is described
PLCD sensors（2）By magnetic core, symmetrically it is wound on the excitation coil at the magnetic core both ends and is uniformly wound among the magnetic core
Induction coil composition；The generator circuit of the sine wave（1）Output signal be input in the excitation coil, generate friendship
Varying magnetic field generates excitation to the induction coil, and the output signal of the induction coil is connected to the preposing signal process circuit（3）
In improved.
3. a kind of method of PLCD sensor signal conditioning circuits followed based on peak value according to claim 1, special
Sign is：Include the following steps：
1）Sine-wave generator（1）Output signal is respectively to phase discriminator（4）With PLCD sensors（2）；
2）PLCD sensors（2）Induction coil output signal pass through preposing signal process circuit（3）Conditioning, it is specially two kinds, a kind of
For through preposing signal process circuit（3）It carries out the output signal after low-pass filtering and signal amplification conditioning and is input to phase discriminator（4）In
Hysteresis loop comparator, another kind is through preposing signal process circuit（3）It carries out low-pass filtering and plus positive bias voltage, is input to peak
Value follows circuit（5）In added the crest voltage of bias；
3）Phase discriminator（4）According to the sine-wave generator received（1）And preposing signal process circuit（3）Output signal, judge
PLCD sensor displacements it is positive and negative；Induction coil square-wave signal is exported to peak value follower circuit（5）, output generating positive and negative voltage logic choosing
Messenger is to output processing circuit（6）In；
4）Peak value follower circuit（5）The crest voltage of the received signal of detection, exports result to output processing circuit（6）；
5）Pass through output processing circuit（6）Obtain indicating the voltage signal of displacement and direction.
4. the method for the PLCD sensor signal conditioning circuits according to claim 3 followed based on peak value, feature are existed
In：The step 3）Middle phase discriminator（4）Judge that the positive and negative specific method of PLCD sensor displacements is：When the PLCD is sensed
Device（2）Excitation coil square-wave signal phase PLCD sensors in advance（2）Induction coil square-wave signal when, the PLCD
Sensor（2）D type flip flop（12）Q output export high level, control output processing circuit（6）Gate positive voltage；Work as institute
When stating induction coil square-wave signal described in excitation coil square-wave signal delayed phase, the d type flip flop（12）Q output output
Low level controls output processing circuit（6）Gate negative voltage.
5. the method for the PLCD sensor signal conditioning circuits according to claim 3 followed based on peak value, feature are existed
In：The step 4）In, the peak value follower circuit（5）The specific method of the crest voltage of the received signal of detection is：
4-1）The peak value follower circuit（5）Two input signals in a cycle, binary channels detecting circuit（13,14）
Follow crest voltage, wherein
Logic gating circuit（15）A output ends export high level, No.1 diode（17）It is not turned on, corresponding No. two inspections of barrier
Wave circuit（14）Capacitance electric discharge；
Logic gating circuit（15）B output ends export low level, No. two diodes（18）Conducting makes corresponding No.1 detection electricity
Road（13）Capacitance repid discharge reset, detect new crest voltage again；
Logic gating circuit（15）C output ends export high level, control electromagnetic switch（16）Gate No.1 detecting circuit（13）
Output voltage；
4-2）In the next cycle of two input signals, binary channels detecting circuit（13,14）Follow crest voltage, wherein
Logic gating circuit（15）A output ends export high level, No.1 diode（17）Conducting, makes corresponding No. two detection electricity
Road（14）Capacitance repid discharge reset, detect new crest voltage again；
Logic gating circuit（15）B output ends export low level, No. two diodes（18）It is not turned on, obstructs corresponding No.1 inspection
Wave circuit（13）Capacitance electric discharge；
Logic gating circuit（15）C output ends export high level, control electromagnetic switch（16）Gate No. two detecting circuits（14）
Output voltage；
Detection peak voltage is repeated by this method, and realization quickly follows.
6. the method for the PLCD sensor signal conditioning circuits according to claim 3 followed based on peak value, feature are existed
In：The step 5）Middle output processing circuit（6）It obtains indicating that the specific method of the voltage signal in displacement and direction is：
The output processing circuit（6）Signal input part be arranged No. two voltage offset electric circuits（19）, No. two voltage bias
Circuit（19）The crest voltage that forward bias is crossed adds the identical negative bias voltage of size, restores real peak voltage value, then
Pass through reverse phase scaling circuit（20）Peak negative voltage equal in magnitude, that symbol is opposite is converted to, the two inputs No. two electromagnetism
Switch（21）, by phase discriminator（4）Realize that the logic gating of generating positive and negative voltage, output indicate PLCD sensor displacement size and Orientations
Voltage signal；
No. two voltage offset electric circuits（19）With the step 2）In the acquired crest voltage for having added bias bias
Voltage value is less than diode（17,18）Forward conduction voltage drop, ensure that diode（17,18）The shape of lightly conducting is in when work
State.
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| CN110132118B (en) * | 2019-06-13 | 2021-11-16 | 重庆红江机械有限责任公司 | Displacement detection system based on LVDT sensor |
| CN111030648B (en) * | 2019-12-25 | 2023-03-14 | 厦门亿芯源半导体科技有限公司 | Symmetrical double-channel signal peak-to-peak value detection circuit |
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| CN201611365U (en) * | 2009-11-25 | 2010-10-20 | 天津南大强芯半导体芯片设计有限公司 | Small-signal peak voltage detection circuit |
| CN202133712U (en) * | 2011-07-08 | 2012-02-01 | 青岛智腾微电子有限公司 | Peak detection circuit |
| CN103297005A (en) * | 2012-03-02 | 2013-09-11 | 中国科学院微电子研究所 | Peak detection circuit |
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| CN101788598A (en) * | 2009-11-25 | 2010-07-28 | 天津南大强芯半导体芯片设计有限公司 | Voltage peak detection circuit and operating method thereof |
| CN201611365U (en) * | 2009-11-25 | 2010-10-20 | 天津南大强芯半导体芯片设计有限公司 | Small-signal peak voltage detection circuit |
| CN202133712U (en) * | 2011-07-08 | 2012-02-01 | 青岛智腾微电子有限公司 | Peak detection circuit |
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