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 invention relates to a PLCD sensor signal conditioning circuit and a method thereof based on peak value following, belonging to the technical field of sensor signal processing.
Background
Compared with the mainstream non-contact displacement sensor LVDT sensor and the magnetostrictive displacement sensor in the market, the PLCD sensor has the advantages of better reliability and adaptability, more compact structure, lower manufacturing cost and particularly convenient installation and use.
At present, the PLCD sensor technology is vigorously developed abroad and always goes ahead of the world, the domestic research and development of the permanent magnet linear non-contact displacement sensor is still in a blank stage, and the main difficulty of the PLCD sensor is a conditioning circuit of an output signal, so that a high-performance and reliable PLCD sensor signal conditioning circuit is urgently needed to be designed.
The key of the PLCD sensor signal conditioning circuit design is to quickly and accurately obtain the amplitude of the induction signal and judge the phase of the signal. For the detection of the amplitude of the electromagnetic induction signal, a precise rectification method is generally adopted, but the problems of slow response and poor real-time performance exist. The invention provides a PLCD sensor signal conditioning method based on peak value following, which can quickly obtain voltage signals representing the magnitude and direction of displacement.
Chinese patent publication No. CN 103297005a discloses a peak detection circuit, which is capable of linearly and rapidly detecting a peak with a wide operating band and low power consumption, but is only applicable to a high-frequency linear system, and cannot be applied to low-frequency signal peak detection of a PLCD sensor.
Chinese patent publication No. CN 201748940U discloses a peak detector circuit controlled by a single chip microcomputer, which cannot maintain high precision by simply using a capacitor to hold a voltage, and the single chip microcomputer is used to realize the discharge of the capacitor, although the real-time performance can be achieved, the discharge is complicated, and the detection of a low-amplitude signal cannot be performed due to the limitation of the forward conduction voltage drop of a diode.
Chinese patent publication No. CN 202133712U discloses an integrated packaged peak detector circuit, which can achieve good real-time performance by using a logic circuit, but the circuit is still complicated, and when an input signal has noise, it is easy to cause false triggering of an internal trigger, and a low-amplitude signal cannot be detected.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides a PLCD sensor signal conditioning circuit based on peak value following and a method thereof, displacement is quickly obtained through peak value following, the dynamic characteristic is good, and the problems that small signals of a PLCD sensor near a zero position are difficult to capture, and positive and negative values are difficult to judge are solved.
The technical scheme is as follows: in order to achieve the purpose, the invention adopts the technical scheme that:
a PLCD sensor signal conditioning circuit based on peak value following comprises a sine wave generator circuit, a PLCD sensor, a preprocessing circuit, a phase discrimination circuit, a peak value following circuit and an output processing circuit; wherein,
the signal output end of the sine wave generator is respectively connected with the signal input end of the PLCD sensor and the first input end of the phase discrimination circuit;
the signal output end of the PLCD sensor is connected with the signal input end of the preprocessing circuit;
two signal output ends of the pre-processing circuit are respectively connected with a second signal input end of the phase discrimination circuit and a first signal input end of the peak value following circuit;
a first signal output end of the phase discrimination circuit is connected with a second signal input end of the peak value following circuit; and a second signal output end of the phase discrimination circuit and a signal output end of the peak value following circuit are respectively connected with two signal input ends of the output processing circuit.
Furthermore, the PLCD sensor consists of a magnetic core, excitation coils symmetrically wound at two ends of the magnetic core and induction coils uniformly wound in the middle of the magnetic core; and an output signal of the sine wave generator circuit is input into the exciting coil to generate an alternating magnetic field to excite the induction coil, and an output signal of the induction coil is connected into the preprocessing circuit to be conditioned.
Furthermore, the preprocessing circuit is composed of a low-pass filter circuit, a voltage amplifying circuit and a voltage biasing circuit, and the signal output end of the low-pass filter circuit is respectively connected with the signal input ends of the voltage amplifying circuit and the voltage biasing circuit;
the signal output end of the voltage amplifying circuit is connected with a hysteresis comparator in the phase discriminating circuit; and the signal output end of the voltage bias circuit is connected with the input end of a double-channel detection circuit in the peak value following circuit.
Furthermore, the phase detection circuit is composed of two hysteresis comparators and a D trigger, wherein the two hysteresis comparators are a first hysteresis comparator and a second hysteresis comparator respectively; the D trigger comprises two input ends, namely a D input end and a clock input end, and also comprises a Q output end, wherein the Q output end is a second signal output end of the phase discrimination circuit and is connected with a signal input end of the output processing circuit;
the output signal of the sine wave generator circuit is input into the first hysteresis comparator, converted into an excitation coil square wave signal and then input into the D input end of the D trigger;
an output signal of a voltage amplifying circuit of one of the output ends in the pre-processing circuit is input into the second hysteresis comparator and converted into an induction coil square wave signal, and the induction coil square wave signal is input into a clock input end of the D trigger on one hand and is input into a logic gating circuit in the peak value following circuit on the other hand.
Furthermore, the peak value following circuit consists of a double-channel detection circuit, a logic gating circuit, an electromagnetic switch and a diode;
the signal output ends of the two-channel detection circuit and the logic gating circuit are connected with the signal input end of the electromagnetic switch, and the signal output end of the electromagnetic switch is connected with one signal input end of the output processing circuit; the two-channel detection circuits are respectively connected with the logic gating circuit through the diodes;
an output signal of a voltage bias circuit of one of the output ends in the pre-processing circuit is input to a signal input end of the dual-channel detection circuit, namely a first signal input end of the peak value following circuit; the first signal output end of the dual-channel detection circuit is a peak voltage output end and is connected with the electromagnetic switch, and the second signal output end of the dual-channel detection circuit is a holding capacitor charging and discharging end and is connected with the logic gating circuit;
the logic gating circuit consists of a monostable trigger, a bistable trigger and two AND gate circuits; the output signal of the second hysteresis comparator which is one of the input ends in the phase discrimination circuit is input to the signal input end of the logic gating circuit, namely the output signal is a monostable trigger and a bistable triggerThe Q output end of the monostable trigger and the Q output end of the bistable trigger are connected with the signal input end of the AND gate circuit, and the Q output end of the monostable trigger and the Q output end of the bistable trigger are connected with the signal input end of the peak value following circuitThe output end of the AND gate circuit is connected with the signal input end of the AND gate circuit, and the output end of the AND gate circuit is the A, B output end of the logic gating circuit.
Furthermore, the output processing circuit is formed by sequentially connecting a second voltage bias circuit, an inverse proportion operation circuit and an electromagnetic switch, and output signals of the second voltage bias circuit are respectively input to the inverse proportion operation circuit and the electromagnetic switch;
the output signal end of the peak value following circuit is connected with the second voltage bias circuit, and the second signal output end of the phase discrimination circuit is input to the second electromagnetic switch.
A method for a PLCD sensor signal conditioning circuit based on peak following, comprising the steps of:
1) the output signals of the sine wave generator are respectively sent to a phase discrimination circuit and a PLCD sensor;
2) an output signal of an induction coil of the PLCD sensor is conditioned by a pre-processing circuit, specifically, the output signal after being subjected to low-pass filtering and signal amplification conditioning by the pre-processing circuit is input into a hysteresis comparator in a phase discrimination circuit, and the output signal after being subjected to low-pass filtering and signal amplification conditioning by the pre-processing circuit is input into a peak value following circuit to obtain a peak voltage added with a bias value;
3) the phase discrimination circuit judges whether the PLCD sensor is displaced or not according to the received output signals of the sine wave generator and the preprocessing circuit; outputting square wave signals of the induction coil to a peak value following circuit, and outputting positive and negative voltage logic gating signals to an output processing circuit;
4) the peak value following circuit detects the peak voltage of the received signal and outputs the result to the output processing circuit;
5) and obtaining a voltage signal representing the displacement magnitude and direction through an output processing circuit.
Further, the specific method for judging whether the displacement of the PLCD sensor is positive or negative by the phase discrimination circuit in the step 3) is as follows: when the phase of the square wave signal of the exciting coil of the PLCD sensor leads the square wave signal of the induction coil of the PLCD sensor, the Q output end of the D trigger of the PLCD sensor outputs high level to control the output processing circuit to gate positive voltage; when the phase of the square wave signal of the exciting coil lags behind the square wave signal of the induction coil, the Q output end of the D trigger outputs low level to control the output processing circuit to gate negative voltage.
Further, in step 4), a specific method for detecting the peak voltage of the received signal by the peak follower circuit is as follows:
4-1) the two input signals of the peak follower circuit follow the peak voltage in the first period, wherein,
the output end A of the logic gating circuit outputs high level, the first diode is not conducted, and the capacitor of the corresponding second detection circuit is blocked from discharging;
the output end B of the logic gating circuit outputs low level, the second diode is conducted, the capacitor of the corresponding first detection circuit is enabled to discharge and reset quickly, and new peak voltage is detected again;
the C output end of the logic gating circuit outputs high level to control the electromagnetic switch to gate the second detection circuit to output voltage;
4-2) the two-channel detector circuit follows the peak voltage during the next period of the two input signals, wherein,
the output end A of the logic gating circuit outputs high level, the first diode is conducted, the capacitor of the corresponding second detection circuit is rapidly discharged and reset, and new peak voltage is detected again;
the output end B of the logic gating circuit outputs low level, and the second diode is not conducted to block the capacitor of the corresponding first detection circuit from discharging;
the C output end of the logic gating circuit outputs high level to control the electromagnetic switch to gate the second detection circuit to output voltage;
in this way, the peak voltage is repeatedly detected, and quick following is realized.
Further, a specific method for obtaining the voltage signal representing the magnitude and direction of the displacement by the output processing circuit in the step 5) is as follows:
the signal input end of the output processing circuit is provided with a second voltage bias circuit, the second voltage bias circuit adds the positive biased peak voltage with the negative bias voltage with the same magnitude to restore the real peak voltage value, and then the real peak voltage value is converted into the peak negative voltage with the same magnitude and opposite sign through the inverse proportion operation circuit, the peak negative voltage and the peak negative voltage are input into the electromagnetic switch, the phase discrimination circuit (4) realizes the logical gating of positive and negative voltage, and voltage signals representing the displacement magnitude and the direction of the PLCD sensor are output;
the second voltage bias circuit and the peak voltage added with the bias value obtained in the step 2), namely the bias voltage value, are lower than the forward conduction voltage drop of the diode, so that the diode is in a micro-conduction state during working.
Has the advantages that: compared with the prior art, the peak value following based PLCD sensor signal conditioning circuit and the method thereof have the advantages that compared with the conventional rectification filtering conditioning circuit, the peak value following based PLCD sensor signal conditioning circuit can quickly obtain the displacement size, the dynamic characteristic is good, and in addition, the problems that small signals are difficult to capture near zero positions of the PLCD sensor, and the positive and negative values are difficult to judge are solved.
Drawings
FIG. 1 is a flow chart of a PLCD sensor conditioning circuit;
FIG. 2 is a pre-processing circuit diagram;
fig. 3 is a phase detection circuit diagram;
FIG. 4 is a peak follower circuit diagram;
FIG. 5 is an output processing circuit diagram;
FIG. 6 is a logic gating circuit diagram
Fig. 7 is a Multisim circuit simulation diagram.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
The invention relates to a PLCD sensor signal conditioning circuit based on peak value following and a method thereof, which can obtain the effective value of the output signal of a PLCD sensor at the highest speed, judge the displacement direction and detect the small signal of a zero position accessory. The invention comprises a sine wave generator circuit, a PLCD sensor, a preprocessing circuit, a phase discrimination circuit, a peak value following circuit and an output processing circuit. The sine wave generator circuit drives an exciting coil of the PLCD sensor, and after output signals of an induction coil of the PLCD sensor pass through the preprocessing circuit, the output signals and output signals of the sine wave generator circuit are input into the phase discrimination circuit together on one hand to judge whether the sensor is displaced or not; on the other hand, the input peak value following circuit detects the peak voltage of the output signal, and finally, the voltage signal representing the displacement size and direction is obtained through the output processing circuit. Compared with a conventional rectification filtering conditioning circuit, the invention can quickly obtain the displacement size through peak value following, has good dynamic characteristic, and solves the problems that a small signal of the PLCD sensor near a zero position is difficult to capture and the positive and negative values are difficult to judge.
The specific contents are as follows:
as shown in fig. 1, the signal conditioning circuit of the PLCD sensor based on peak following structurally comprises a sine wave generator circuit 1, a PLCD sensor 2, a pre-processing circuit 3, a phase discrimination circuit 4, a peak following circuit 5 and an output processing circuit 6, wherein the signal output part of sine wave generator 1 links to each other with the signal input part of PLCD sensor 2, the first input end of phase discrimination circuit 4, the signal output part of PLCD sensor 2 links to each other with the signal input part of pre-processing circuit 3, two signal output parts of pre-processing circuit 3 respectively with the second signal input part of phase discrimination circuit 4, the first signal input part of peak value follower circuit 5 links to each other, the first signal output part of phase discrimination circuit 4 links to each other with the second signal input part of peak value follower circuit 5, the second signal output part of phase discrimination circuit 4 and the signal output part of peak value follower circuit 5 link to each other with two signal input parts of output processing circuit 6 respectively.
The PLCD sensor 2 consists of a magnetic core, excitation coils symmetrically wound at two ends of the magnetic core and induction coils uniformly wound in the middle of the magnetic core, an output signal of the sine wave generator circuit 1 is input into the excitation coils to generate an alternating magnetic field to excite the induction coils, and an output signal of the induction coils is connected into the preprocessing circuit 3 to be conditioned.
The sine wave generator circuit 1 is composed of an RC sine wave oscillation circuit, an in-phase following circuit and an OCL circuit for eliminating step distortion, and can output stable sine wave signals to the PLCD sensor 2 to drive an excitation coil of the PLCD sensor 2, so that the induction coil is excited to generate corresponding induced electromotive force.
As shown in fig. 2, the preprocessing circuit 3 includes a low-pass filter circuit 7, a voltage amplifier circuit 8, and a voltage bias circuit 9. An output signal of an induction coil of the PLCD sensor 2 is input into the pre-processing circuit 3, low-pass filtering is firstly carried out on the output signal of the induction coil through the low-pass filtering circuit 7 to filter out high-frequency noise, the voltage amplifying circuit 8 amplifies the filtered signal by proper times and then inputs the amplified signal into the hysteresis comparator in the phase discrimination circuit 4, so that a small-amplitude signal can be converted into a stable square wave, the voltage biasing circuit 9 adds positive bias voltage to the filtered signal and inputs the signal into the peak value following circuit 5 to obtain peak voltage added with the bias value, and the small-amplitude signal can be collected into a peak voltage value.
As shown in fig. 3, the phase detection circuit 4 is composed of two hysteresis comparators 10 and 11 and a D flip-flop 12, and an output signal of the sine wave generator circuit 1 is input into the hysteresis comparator 10, converted into an excitation coil square wave signal, and then input into a D input end of the D flip-flop 12; the output signal of the voltage amplifying circuit 8 is input into a hysteresis comparator 11, converted into an induction coil square wave signal, and input into a clock input CP end of a D trigger 12 on one hand, and input into a logic gating circuit 15 in a peak value following circuit 5 on the other hand, when the phase of an excitation coil square wave signal is advanced to that of the induction coil square wave signal, the Q output end of the D trigger 12 outputs a high level, and an output processing circuit 6 is controlled to gate a positive voltage; when the phase of the excitation coil square wave signal lags the phase of the induction coil square wave signal, the Q output end of the D trigger 12 outputs low level, and the output processing circuit 6 is controlled to gate negative voltage.
As shown in fig. 4, the peak follower circuit 5 is constituted by two-channel detector circuits 13, 14, a logic gate circuit 15, an electromagnetic switch 16 and diodes 17, 18, wherein the first signal output terminal of the detection circuit 13, 14 is the peak voltage output terminal, the second signal output terminal is the charge-discharge terminal of the holding capacitor, the output signal of the voltage bias circuit 9 is inputted to the signal input terminal of the detection circuit 13, 14, the output signal of the hysteresis comparator 11 is inputted to the signal input terminal of the logic gating circuit 15, in the first period of two input signals, the detector circuits 13 and 14 follow the peak voltage, the output end A outputs high level, the diode 17 blocks the capacitor of the detector circuit 13 from discharging, the output end B outputs low level, the diode 18 is conducted to enable the capacitor of the detector circuit 14 to discharge and reset quickly, new peak voltage is detected again, and the output end C outputs high level to control the electromagnetic switch 16 to gate the output voltage of the detector circuit 13; in the next period of two input signals, the detection circuits 13 and 14 follow the peak voltage, the A output end outputs low level, the diode 17 is conducted to enable the capacitor of the detection circuit 13 to discharge and reset quickly, new peak voltage is detected again, the B output end outputs high level, the diode 18 prevents the capacitor of the detection circuit 14 from discharging, and the C output end outputs low level to control the electromagnetic switch 16 to gate the output voltage of the detection circuit 14, so that the peak voltage is detected repeatedly in this way, and quick following is realized.
As shown in fig. 6, the logic gating circuit 15 is composed of a monostable flip-flop 22, a bistable flip-flop 23, and two and circuits 24, 25; an output signal of the second hysteresis comparator 11, which is one of the input terminals in the phase detection circuit 4, is input to a signal input terminal of the logic gating circuit 15, that is, a signal input terminal of the monostable flip-flop 22 and the bistable flip-flop 23, that is, a second signal input terminal of the peak value follower circuit 5; the Q output end of the monostable flip-flop 22 and the Q output end of the bistable flip-flop 23 are connected with the signal input end of the AND gate 24, and the Q output end of the monostable flip-flop 22 and the Q output end of the bistable flip-flop 23The output end is connected with the signal input end of the AND gate circuit 25, and the output ends of the AND gate circuits 24 and 25 are the A, B output ends of the logic gating circuit.
As shown in fig. 5, the output processing circuit 6 is composed of a second voltage bias circuit 19, an inverse proportion operation circuit 20 and an electromagnetic switch 21, the second voltage bias circuit 19 adds negative bias voltages with the same magnitude to the forward biased peak voltage to restore the true peak voltage value, and then the second voltage bias circuit 20 converts the positive biased peak voltage value into peak negative voltages with the same magnitude and opposite signs, and the peak negative voltages are input into the electromagnetic switch 21, and the phase detection circuit 4 realizes the logical gating of the positive and negative voltages and outputs voltage signals representing the displacement magnitude and the direction of the PLCD sensor.
Considering the influence that the capacitor in the peak value following circuit 5 is discharged through the diode, and the forward conduction voltage drop of the diode causes the voltage of the small signal not to be generated, the bias voltage values obtained by the voltage bias circuit 9 and the second voltage bias circuit 19 are proper, the excessive bias voltage causes the capacitor to be discharged too much, and the holding voltage of the capacitor is too high due to the simultaneous charging of the input signal and the bias voltage in the subsequent charging process; when the input signal is smaller than the forward conduction voltage of the diode due to an excessively small bias voltage, the diode is not conducted, and the discharge time of the capacitor is too long due to the fact that the input signal is a low-frequency signal, so that real-time follow-up performance is affected; the ideal bias voltage should be slightly below the forward conduction voltage drop of the diode, keeping the diode slightly conductive when discharged, so that a small amplitude input signal can be detected.
Examples
The peak-following based PLCD sensor signal conditioning circuit was simulated using Multisim software, as shown in fig. 7. The gray thin lines are input signals of the exciting coil, the black thin lines are output signals of the induction coil, and the black thick lines are output signals of the output processing circuit 6. The output signal can quickly and accurately follow the peak voltage of the induction coil, and when the input signal of the exciting coil is ahead of the output signal of the induction coil, the final output signal is positive; when the excitation coil input signal lags the induction coil output signal, the resulting output signal is negative. The signal conditioning circuit of the PLCD sensor based on peak value following can accurately detect and output voltage signals representing the displacement size and direction of the PLCD sensor, and meanwhile, a good dynamic tracking effect is kept.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (10)
1. A PLCD sensor signal conditioning circuit based on peak value following is characterized in that: the device comprises a sine wave generator circuit (1), a PLCD sensor (2), a preprocessing circuit (3), a phase discrimination circuit (4), a peak value following circuit (5) and an output processing circuit (6); wherein,
the signal output end of the sine wave generator (1) is respectively connected with the signal input end of the PLCD sensor (2) and the first input end of the phase discrimination circuit (4);
the signal output end of the PLCD sensor (2) is connected with the signal input end of the pre-processing circuit (3);
two signal output ends of the preprocessing circuit (3) are respectively connected with a second signal input end of the phase discrimination circuit (4) and a first signal input end of the peak value following circuit (5);
a first signal output end of the phase discrimination circuit (4) is connected with a second signal input end of the peak value following circuit (5); and a second signal output end of the phase discrimination circuit (4) and a signal output end of the peak value following circuit (5) are respectively connected with two signal input ends of the output processing circuit (6).
2. The peak-follow-based PLCD sensor signal conditioning circuit of claim 1, wherein: the PLCD sensor (2) consists of a magnetic core, excitation coils symmetrically wound at two ends of the magnetic core and induction coils uniformly wound in the middle of the magnetic core; the output signal of the sine wave generator circuit (1) is input into the exciting coil to generate an alternating magnetic field to excite the induction coil, and the output signal of the induction coil is connected into the preprocessing circuit (3) to be conditioned.
3. The peak-follow-based PLCD sensor signal conditioning circuit of claim 1, wherein: the preprocessing circuit (3) is composed of a low-pass filter circuit (7), a voltage amplifying circuit (8) and a voltage biasing circuit (9), and the signal output end of the low-pass filter circuit (7) is respectively connected with the signal input ends of the voltage amplifying circuit (8) and the voltage biasing circuit (9);
the signal output end of the voltage amplifying circuit (8) is connected with a hysteresis comparator in the phase discriminating circuit (4); and the signal output end of the voltage bias circuit (9) is connected with the input ends of two-channel detection circuits (13, 14) in the peak value following circuit (5).
4. The peak-follow-based PLCD sensor signal conditioning circuit of claim 1, wherein: the phase detection circuit (4) is composed of two hysteresis comparators (10, 11) and a D trigger (12), wherein the two hysteresis comparators (10, 11) are a first hysteresis comparator (10) and a second hysteresis comparator (11) respectively; the D trigger (12) comprises two input ends, namely a D input end and a clock input end, and also comprises a Q output end, wherein the Q output end is a second signal output end of the phase discrimination circuit (4) and is connected with a signal input end of the output processing circuit (6);
the output signal of the sine wave generator circuit (1) is input into the first hysteresis comparator (10), converted into an excitation coil square wave signal and then input into the D input end of the D trigger (12);
an output signal of a voltage amplifying circuit (8) of one of output ends in the preprocessing circuit (3) is input into the second hysteresis comparator (11) and converted into an induction coil square wave signal, and the induction coil square wave signal is input into a clock input end of the D flip-flop (12) on one hand and a logic gating circuit (15) in the peak value following circuit (5) on the other hand.
5. The peak-follow-based PLCD sensor signal conditioning circuit of claim 1, wherein: the peak value following circuit (5) is composed of two-channel detection circuits (13, 14), a logic gating circuit (15), an electromagnetic switch (16) and diodes (17, 18);
the signal output ends of the two-channel detection circuits (13, 14) and the logic gating circuit (15) are connected with the signal input end of the electromagnetic switch (16), and the signal output end of the electromagnetic switch (16) is connected with one of the signal input ends of the output processing circuit (6); the two-channel detection circuits (13, 14) are respectively connected with the logic gating circuit (15) through the diodes (17, 18);
the output signal of a voltage bias circuit (9) of one of the output ends in the preprocessing circuit (3) is input to the signal input ends of the two-channel detection circuits (13, 14), namely the first signal input end of the peak value following circuit (5); the first signal output end of the double-channel detection circuit (13, 14) is a peak voltage output end and is connected with the electromagnetic switch (16), and the second signal output end is a holding capacitor charging and discharging end and is connected with the logic gating circuit (15);
the logic gating circuit (15) is composed of a monostable trigger (22), a bistable trigger (23) and two AND gate circuits (24 and 25); the output signal of a second hysteresis comparator (11) which is one of the input ends of the phase detection circuit (4) is input to the signal input end of the logic gating circuit (15), namely the signal input ends of a monostable trigger (22) and a bistable trigger (23), namely the second signal input end of the peak value following circuit (5); the Q output end of the monostable trigger (22) and the Q output end of the bistable trigger (23) are connected with the signal input end of the AND circuit (24), and the Q output end of the monostable trigger (22) and the Q output end of the bistable trigger (23) are connected with the signal input end of the AND circuit (24)The output end of the logic gating circuit is connected with the signal input end of the AND gate circuit (25), and the output ends of the AND gate circuits (24 and 25) are the A, B output ends of the logic gating circuit.
6. The peak-follow-based PLCD sensor signal conditioning circuit of claim 1, wherein: the output processing circuit (6) is formed by sequentially connecting a second voltage bias circuit (19), an inverse proportion operation circuit (20) and a second electromagnetic switch (21), and output signals of the second voltage bias circuit (19) are respectively input into the inverse proportion operation circuit (20) and the second electromagnetic switch (21);
the output signal end of the peak value following circuit (5) is connected with the second voltage bias circuit (19), and the second signal output end of the phase discrimination circuit (4) is input into the second electromagnetic switch (21).
7. A method for a PLCD sensor signal conditioning circuit based on peak value following is characterized in that: the method comprises the following steps:
1) the sine wave generator (1) outputs signals to the phase discrimination circuit (4) and the PLCD sensor (2) respectively;
2) an output signal of an induction coil of the PLCD sensor (2) is conditioned by a pre-processing circuit (3), specifically, two signals are provided, one is a hysteresis comparator which inputs the output signal after low-pass filtering and signal amplification conditioning by the pre-processing circuit (3) into a phase discrimination circuit (4), the other is a peak voltage which is input into a peak value following circuit (5) and added with a bias value after low-pass filtering and positive bias voltage addition by the pre-processing circuit (3);
3) the phase discrimination circuit (4) judges whether the PLCD sensor is displaced or not according to the received output signals of the sine wave generator (1) and the preprocessing circuit (3); outputting square wave signals of the induction coil to a peak value following circuit (5), and outputting positive and negative voltage logic gating signals to an output processing circuit (6);
4) the peak value following circuit (5) detects the peak voltage of the received signal and outputs the result to the output processing circuit (6);
5) voltage signals representing the magnitude and direction of displacement are obtained by an output processing circuit (6).
8. The method for peak-follow based PLCD sensor signal conditioning circuit of claim 7, wherein: the specific method for judging the positive and negative of the displacement of the PLCD sensor by the phase discrimination circuit (4) in the step 3) is as follows: when the phase of the square wave signal of the exciting coil of the PLCD sensor (2) is ahead of the phase of the square wave signal of the induction coil of the PLCD sensor (2), the Q output end of a D trigger (12) of the PLCD sensor (2) outputs high level, and an output processing circuit (6) is controlled to gate positive voltage; when the phase of the excitation coil square wave signal lags behind the induction coil square wave signal, the Q output end of the D trigger (12) outputs low level, and the output processing circuit (6) is controlled to gate negative voltage.
9. The method for peak-follow based PLCD sensor signal conditioning circuit of claim 7, wherein: in the step 4), a specific method for detecting the peak voltage of the received signal by the peak follower circuit (5) is as follows:
4-1) two input signals of the peak follower circuit (5) follow the peak voltage in a first period by a two-channel detector circuit (13, 14), wherein,
the A output end of the logic gating circuit (15) outputs high level, the first diode (17) is not conducted, and the capacitor of the corresponding second detection circuit (14) is blocked from discharging;
the output end B of the logic gating circuit (15) outputs low level, the second diode (18) is conducted, the capacitor of the corresponding first detection circuit (13) is rapidly discharged and reset, and new peak voltage is detected again;
the C output end of the logic gating circuit (15) outputs high level to control the electromagnetic switch (16) to gate the output voltage of the second detection circuit (13);
4-2) the two-channel detector circuit (13, 14) follows the peak voltage in the next period of the two input signals, wherein,
the A output end of the logic gating circuit (15) outputs high level, the first diode (17) is conducted, the capacitor of the corresponding second detection circuit (14) is rapidly discharged and reset, and new peak voltage is detected again;
the output end B of the logic gating circuit (15) outputs low level, and the second diode (18) is not conducted to block the capacitor of the corresponding first detection circuit (13) from discharging;
the C output end of the logic gating circuit (15) outputs high level to control the electromagnetic switch (16) to gate the output voltage of the second detection circuit (13);
in this way, the peak voltage is repeatedly detected, and quick following is realized.
10. The method for peak-follow based PLCD sensor signal conditioning circuit of claim 7, wherein: the specific method for obtaining the voltage signal representing the displacement magnitude and direction by the output processing circuit (6) in the step 5) is as follows:
a second voltage bias circuit (19) is arranged at a signal input end of the output processing circuit (6), the second voltage bias circuit (19) adds negative bias voltage with the same magnitude to the forward biased peak voltage to restore the real peak voltage value, and then the real peak voltage value is converted into peak negative voltage with the same magnitude and opposite sign through an inverse proportion operation circuit (20), the two peak negative voltage values are input into a second electromagnetic switch (21), the phase discrimination circuit (4) realizes the logical gating of the positive and negative voltages, and voltage signals representing the displacement magnitude and the direction of the PLCD sensor are output;
the second voltage bias circuit (19) and the bias value added peak voltage obtained in the step 2), namely the bias voltage value, are lower than the forward conduction voltage drop of the diodes (17, 18), so that the diodes (17, 18) are in a micro-conduction state during working.
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