CN207622680U - Signal demodulating circuit and sensing device - Google Patents
Signal demodulating circuit and sensing device Download PDFInfo
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- CN207622680U CN207622680U CN201721888214.2U CN201721888214U CN207622680U CN 207622680 U CN207622680 U CN 207622680U CN 201721888214 U CN201721888214 U CN 201721888214U CN 207622680 U CN207622680 U CN 207622680U
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
- H03D3/006—Demodulation of angle-, frequency- or phase- modulated oscillations by sampling the oscillations and further processing the samples, e.g. by computing techniques
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D2200/00—Indexing scheme relating to details of demodulation or transference of modulation from one carrier to another covered by H03D
- H03D2200/0041—Functional aspects of demodulators
- H03D2200/006—Signal sampling
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Abstract
The utility model belongs to electronic circuit technology field, provide signal demodulating circuit and sensing device, the signal demodulating circuit includes operational amplifying module, comparison module, phase sensitive detection module, filter module and conversion module, after being amplified to received signal by operational amplifying module and being compared to the signal by comparing module, direct current signal is rectified by phase sensitive detection module again, filter module is filtered the direct current signal and exports d. c. voltage signal, d. c. voltage signal is transformed into predetermined DC current signal powering load eventually by conversion module.It is thus achieved that signal is amplified, is compared, after filter rectification and conversion process export predetermined DC current signal powering load effect, the circuit stability；And feedback unit is provided in conversion module, so that the signal of output does not change with the variation of load.
Description
Technical field
The utility model belongs to electronic circuit technology field, more particularly to signal demodulating circuit and sensing device.
Background technology
Existing signal demodulating circuit typically first generates the sine wave signal of an excitation, then passes through capacitance coupling
The mode of conjunction is applied directly to linear displacement transducer (Linear Variable Differential Transformer, LVDT)
Primary coil, since primary coil will produce electromagnetic field, soft magnetic bodies iron core is magnetized, in turn influence LVDT magnetic field, iron
The output AC voltage of two secondary coils can be moved with iron core and be changed when core moves.Meanwhile by the output of secondary coil
When alternating voltage is transformed into the DC voltage or current signal of needs, generally using the either single amplifier essence of diode rectification filtering
Close rectification adds active power filtering, but diode rectification filtering has diode drop, diode when output voltage is very low
It will appear the phenomenon that being not turned on, therefore diode rectification filtering is served only in circuit of less demanding；It is whole using single amplifier precision
When stream plus active power filtering, impedance can be with the change in polarity of input.
Rectifying and wave-filtering is not carried out to the alternating voltage of secondary coil output in existing signal demodulating circuit, causes to occur
The unstable problem of circuit.
Utility model content
The purpose of this utility model is to provide signal demodulating circuit and sensing devices, it is intended to solve existing signal demodulation
Rectifying and wave-filtering is not carried out to the alternating voltage of secondary coil output in circuit, leads to the unstable problem of circuit occur.
The utility model first aspect provides a kind of signal demodulating circuit, is mediated for receiving signal and carrying out solution to it
After reason, predetermined DC current signal is provided to load, the signal demodulating circuit includes：
Operational amplifying module for being amplified processing to the signal；
Comparison module for being compared simultaneously output pulse signal to the signal；
Be connected with the operational amplifying module and the comparison module, for the signal after enhanced processing into
Row rectification and the phase sensitive detection module for exporting direct current signal；
It is connected with the output end of the phase sensitive detection module, for exporting direct current after being filtered to the direct current signal
First filter module of voltage signal；And
It is connected with the output end of first filter module, it is described default for being converted to the d. c. voltage signal
The conversion module of DC current signal；
Wherein, the conversion module includes conversion processing unit and feedback unit, and the feedback unit is used for described turn
The signal for changing processing unit output feeds back to the input terminal of the conversion processing unit, so that the predetermined DC electric current of output
Signal does not change with the variation of the load.
The utility model second aspect provides a kind of sensing device, for providing predetermined DC current signal to load,
The sensing device includes sensing element and such as claim 1-10 any one of them signal demodulating circuits；
The sensing element generates a sensing signal；
After the signal demodulating circuit receives the sensing signal and carries out signal demodulation process to it, export described default
DC current signal.
In conclusion above-mentioned signal demodulating circuit and sensing device, which includes operational amplifying module, ratio
Compared with module, phase sensitive detection module, filter module and conversion module, received signal is amplified by operational amplifying module
And after being compared to the signal by comparing module, then direct current signal, filter module be rectified by phase sensitive detection module
D. c. voltage signal is filtered and exported to the direct current signal, is transformed into d. c. voltage signal eventually by conversion module pre-
If DC current signal powering load.It is thus achieved that being amplified, comparing to signal, after filter rectification and conversion process
Export the effect of predetermined DC current signal powering load, the circuit stability；And feedback is provided in conversion module
Member so that the signal of output does not change with the variation of load, therefore solves in existing signal demodulating circuit not to secondary
The alternating voltage of grade coil output carries out rectifying and wave-filtering, leads to the unstable problem of circuit occur.
Description of the drawings
Fig. 1 is the modular structure schematic diagram of signal demodulating circuit provided by the utility model.
Fig. 2 is the modular structure schematic diagram of sensing device provided by the utility model.
Fig. 3 is the exemplary circuit figure of sensing device provided by the utility model.
Specific implementation mode
In order to make the technical problems to be solved in the utility model, technical solution and advantageous effect be more clearly understood, below
In conjunction with accompanying drawings and embodiments, the present invention will be further described in detail.It should be appreciated that specific implementation described herein
Example is only used to explain the utility model, is not used to limit the utility model.
The signal demodulating circuit and sensing device that the utility model embodiment provides, the power input of the signal demodulating circuit
Part adds magnetic bead, Transient Suppression Diode, capacitance and reverse protection diode, has to external electric signal impact very strong
Defencive function；Primary pumping signal generation circuit is engaged using operational amplifier and RC circuits, generates a class formula sawtooth wave
Signal, after be filtered with three order active filter, generate distortion factor very little sine wave signal；Electric voltage exception in order to prevent,
The voltage-stabiliser tube that rear class adds relatively high power carries out overvoltage protection；Secondary uses phase sensitive detection, mainly by technotron and
Operational amplifier is constituted, and can be good at AC signal being changed into pulsating direct current signal, while using negative-feedback circuit, so that
Output current does not change with load；Rear class has added reverse-phase protection diode D2 and EMI suppression circuit again.Pass through above-mentioned circuit
Connection structure realizes that minimum quiescent current is less than 4 milliamperes, and running current is no more than 26 milliamperes, has reached intrinsic safe explosion-proof
It is required that.
In order to illustrate technical solution described in the utility model, illustrated below by specific embodiment.
Fig. 1 shows the modular structure of signal demodulating circuit provided by the utility model, for convenience of description, illustrates only
With the relevant part of the utility model embodiment, details are as follows：
Above-mentioned signal demodulating circuit, for after receiving signal and carrying out demodulation process to it, predetermined DC to be provided to load
Current signal, the signal demodulating circuit include：
Operational amplifying module 105 for being amplified processing to the signal；
Comparison module 106 for being compared simultaneously output pulse signal to the signal；
It is connected with the operational amplifying module 105 and the comparison module 106, for described in after enhanced processing
Signal carries out rectification and exports the phase sensitive detection module 107 of direct current signal；
It is connected with the output end of the phase sensitive detection module 107, for being exported after being filtered to the direct current signal
First filter module 108 of d. c. voltage signal；And
It is connected with the output end of first filter module 108, it is described for being converted to the d. c. voltage signal
The conversion module 109 of predetermined DC current signal；
Wherein, the conversion module 109 includes conversion processing unit 1091 and feedback unit 1092, the feedback unit
1092 input terminal for feeding back to the conversion processing unit 1091 to the signal that the conversion processing unit 1091 exports, with
The predetermined DC current signal of output is set not change with the variation of the load.
As one embodiment of the utility model, which further includes that voltage regulator circuit and electromagnetic interference inhibit
After the voltage (24V) that electromagnetic interference suppression circuit exports power end carries out electromagnetic interference inhibition, electricity is adjusted by voltage for circuit
The voltage of 24V is reduced to the voltage of 5V by road, and is exported to conversion module 109；Also, export predetermined DC in conversion module 109
After current signal, reverse protection diode and electromagnetic interference suppression circuit can be passed through, so that the output of the circuit is more stable.Specifically
Ground, above-mentioned predetermined DC current signal are 4mA-20mA.
Fig. 2 shows the modular structures of sensing device provided by the utility model, for convenience of description, illustrate only and this
The relevant part of utility model embodiment, details are as follows：
Above-mentioned sensing device, for providing predetermined DC current signal to load, the sensing device includes sensing element
104 and signal demodulating circuit as described above；The sensing element 104 generates a sensing signal；The signal demodulating circuit
After receiving the sensing signal and carrying out signal demodulation process to it, the predetermined DC current signal is exported.
As one embodiment of the utility model, above-mentioned sensing device further includes exciting circuit, and the exciting circuit is for producing
A raw pumping signal；
The exciting circuit includes：
Oscillating waveform module 101 for generating saw-shaped wave；
It is connected with the output end of the oscillating waveform module 101, for being exported just after being filtered to the saw-shaped wave
Second filter module 102 of string wave；And
It is connected with the output end of second filter module 102, the overvoltage for preventing the sine voltage mutation
Protection module 103.
As one embodiment of the utility model, above-mentioned sensing device further includes circuit board；The signal demodulating circuit and institute
Exciting circuit is stated all to be set on the circuit board.
As one embodiment of the utility model, above-mentioned sensing element 104 includes coil block, and the coil block includes just
Grade coil and secondary coil；The input of the primary coil terminates the overvoltage protective module 103, the output of the primary coil
End ground connection；The first output end and second output terminal of the secondary coil connect the operational amplifying module 105 and described respectively
Comparison module 106.
Either, above-mentioned sensing element includes：Coil block, the coil block include primary coil and secondary coil,
For receiving the pumping signal, the secondary coil is connected to the signal demodulating circuit and exports sensing the primary coil
Signal；And iron core, the iron core is arranged to can the relatively described coil block movement.
Or it is that above-mentioned sensing element is linear variable difference transformer.
Fig. 3 shows the exemplary circuit of sensing device provided by the utility model, for convenience of description, illustrates only and this
The relevant part of utility model embodiment, details are as follows：
As one embodiment of the utility model, above-mentioned oscillating waveform module 101 include reference voltage VD, first resistor R1,
Second resistance R2,3rd resistor R3, the 4th resistance R4, the first operational amplifier COM1 and the first capacitance C1.
The first end of the output termination first resistor R1 of reference voltage VD, the second end of first resistor R1, second resistance R2
First end, the first end of 3rd resistor R3 and the first operation comparator COM1 normal phase input end connect altogether, 3rd resistor R3
Second end connect altogether with the output end of the first operation comparator COM1 and the first end of the 4th resistance R4, the first operation comparator
The first end of the second end and the first capacitance C1 of the inverting input of COM1 and the 4th resistance R4 connects and altogether as oscillating waveform
The output end of module 101, the second end of second resistance R2 and the second end of the first capacitance C1 are grounded.Specifically, reference voltage VD
It is the AC power VCC for having fixed voltage value, voltage value 5V.In an embodiment of the utility model, the first operation
Amplifier COM1 uses the operational amplifier of model MCP6L72T-E, needs to use low quiescent current amplifier.
In the present embodiment, above-mentioned second filter module 102 include the 5th resistance R5, the 6th resistance R6, the 7th resistance R7,
Second capacitance C2, third capacitance C3, the 4th capacitance C4 and second operational amplifier COM2.The first termination wave of 5th resistance R5
Shape oscillation module 101, the second end of the 5th resistance R5 and the first end of the 6th resistance R6 and the first end of the second capacitance C2 are total
It connects, the second end of the 6th resistance R6 and the first end of the first end of the 7th resistance R7 and third capacitance C3 connect altogether, the 7th resistance
The second end of R7 and the normal phase input end of second operational amplifier COM2 connect altogether, second end and the third capacitance C3 of the second capacitance C2
Second end and the 4th capacitance C4 second end ground connection, the output end of second operational amplifier COM2 is the second filter module
102 output end.In an embodiment of the utility model, second operational amplifier COM2 uses model MCP6L72T-E
Operational amplifier, need use low quiescent current amplifier.
As one embodiment of the utility model, above-mentioned overvoltage protective module 103 includes the first diode D17, the two or two pole
Pipe D18, third diode D19 and the 4th diode D20.The anode of second diode D18 connects the sun of the 4th diode D20
Pole, the cathode of the second diode D18 connect the cathode of the first diode D17, and the cathode of the 4th diode D20 connects third diode
The cathode of D19, the plus earth of the anode and third diode D19 of the first diode D17.
As one embodiment of the utility model, above-mentioned sensing element 104 includes that (Fig. 3 uses LVDT to linear displacement transducer
It indicates).The primary coil input terminal of linear displacement transducer connects overvoltage protective module 103, the primary line of linear displacement transducer
Output end ground connection is enclosed, the first output end and second output terminal of the secondary coil of linear displacement transducer connect operation amplifier mould simultaneously
Block 105 and comparison module 106.Wherein, the primary coil of linear displacement transducer is described secondary for receiving the pumping signal
Grade coil is connected to the signal demodulating circuit and exports sensing signal.Iron is also provided between primary coil and secondary coil
Core, the iron core can be moved relative to primary coil and secondary coil.
As one embodiment of the utility model, above-mentioned operational amplifying module 105 include the 8th resistance R8, the 9th resistance R9,
Tenth resistance R10 and third operational amplifier COM3.The first end of 8th resistance R8 and the first termination of the 9th resistance R9 are felt
Survey element 104, second end, the second end of the 9th resistance R9, the first end of the tenth resistance R10 and the third fortune of the 8th resistance R8
The inverting input for calculating amplifier COM3 connects altogether, the output end of the second end and third operational amplifier COM3 of the tenth resistance R10
It connects altogether and as the output end of operational amplifying module 105, the positive input end grounding of third operational amplifier COM3.In this practicality
In a novel embodiment, third operational amplifier COM3 uses the operational amplifier of model MC33174D, certainly, operation
The model of amplifier does not limit, as long as can reach with the function described in the present embodiment third operational amplifier COM3 also
It can.
As one embodiment of the utility model, above-mentioned comparison module 106 includes eleventh resistor R11, twelfth resistor
R12, comparator COM4 and the 5th capacitance C5.The first end of eleventh resistor R11 and the first termination of twelfth resistor R12 are felt
Survey element 104, the inverting input of the second termination comparator COM4 of eleventh resistor R11, the second end of twelfth resistor R12
The normal phase input end of comparator COM4 is connect, the output of comparator COM4 terminates the first end of the 5th capacitance C5, the 5th capacitance C5's
Second end is the output end of comparison module 106.In the present embodiment for utility model, comparator COM4 uses model
The signal comparator of MC33174D, certainly, the model of signal comparator do not limit, as long as can reach and the present embodiment comparator
Function described in COM4 also may be used.
As one embodiment of the utility model, above-mentioned phase sensitive detection module 107 includes thirteenth resistor R13, the 14th electricity
Hinder R14, the 15th resistance R15, the 16th resistance R16, the 5th operational amplifier COM5, the 5th diode D1 and first switch
Pipe Q1.The first end of thirteenth resistor R13 connects with the first end of the 14th resistance R14 and is connected with operational amplifying module 105 altogether
It connects, the second end of thirteenth resistor R13 and the first end of the 15th resistance R15 and the reverse phase of the 5th operational amplifier COM5 are defeated
Enter end to connect altogether, the second end of the 15th resistance R15 connects and with the output end of the 5th operational amplifier COM5 as phase sensitive detection altogether
The output end of module 107, the normal phase input end and first of the second end and the 5th operational amplifier COM5 of the 14th resistance R14
The input terminal of switching tube Q1 connects altogether, and the cathode of the 5th diode D1 connects comparison module 106, the anode and the tenth of the 5th diode D1
The first end of six resistance R16 and the controlled end of first switch pipe Q1 connect altogether, the second end and first switch of the 16th resistance R16
The output end of pipe Q1 is grounded.In an embodiment of the utility model, the 5th operational amplifier COM5 uses model
The operational amplifier of MC33174D, certainly, the model of operational amplifier do not limit, and are transported with the present embodiment the 5th as long as can reach
The function described in amplifier COM5 is calculated also may be used.
In an embodiment of the utility model, first switch pipe Q1 is field-effect tube or triode；Field-effect tube
Grid, drain electrode and source electrode are respectively the controlled end, input terminal and output end of first switch pipe Q1；The base stage of triode, collection
Electrode and emitter are respectively the controlled end, input terminal and output end of first switch pipe Q1.
As one embodiment of the utility model, above-mentioned first filter module 108 includes the 17th resistance R17, the 18th electricity
Hinder R18, the 19th resistance R19, the 6th capacitance C6, the 7th capacitance C7 and the 6th operational amplifier COM6.17th resistance R17
The second end of the 107, the 17th resistance R17 of the first termination phase sensitive detection module, the first end of the 18th resistance R18, the 19th
The first end of resistance R19 and the first end of the 7th capacitance C7 connect altogether, and the second end of the 18th resistance R18 is with the 6th capacitance C6's
The inverting input of first end and the 6th operational amplifier COM6 connect altogether, second end and the 6th capacitance of the 19th resistance R19
The output end of the second end of C6 and the 6th operational amplifier COM6 connect and altogether as the output ends of the first filter module 108, and
The positive input end grounding of the second end and the 6th operational amplifier COM6 of seven capacitance C7.In an embodiment of the utility model
In, the 6th operational amplifier COM6 uses the operational amplifier of model MC33174D, and certainly, the model of operational amplifier is not
It limits, also may be used with the function described in the 6th operational amplifier COM6 of the present embodiment as long as can reach.
As one embodiment of the utility model, above-mentioned conversion module 109 includes the 20th resistance R20, the 21st resistance
R21, the 22nd resistance R22, the 23rd resistance R23, the 24th resistance R24, the 25th resistance R25, the 7th operation
Amplifier COM7, second switch pipe Q2 and third switching tube Q3.First the first filter module of termination of 20th resistance R20
The normal phase input end and the 23rd resistance R23 of the second end and the 7th operational amplifier COM7 of 108, the 20th resistance R20
First end connect altogether, the anti-phase input of the 7th operational amplifier COM7 terminates the first end of the 22nd resistance R22, the 7th operation
The first end of the 21st resistance R21 of output termination of amplifier COM7, the second end and second switch of the 21st resistance R21
The input terminal of pipe Q2 and the controlled end of third switching tube Q3 connect altogether, and the controlled end of second switch pipe Q2 is with third switching tube Q3's
The first end of output end and the 24th resistance R24 connect altogether, the output end of second switch pipe Q2, the 22nd resistance R22
The first end of second end, the second end of the 24th resistance R24 and the 25th resistance R25 connects altogether, the 23rd resistance R23
The second end of second end and the 25th resistance R25 connect altogether and as the output end of conversion module 109.In the utility model
In one embodiment, the 7th operational amplifier COM7 uses the operational amplifier of model OP259G, certainly, operational amplifier
Model does not limit, and also may be used with the function described in the 7th operational amplifier COM7 of the present embodiment as long as can reach.
Wherein, conversion processing unit 1091 includes the 21st resistance R21, the 24th resistance R24, the 25th resistance
R25, the 7th operational amplifier COM7, second switch pipe Q2 and third switching tube Q3；Feedback unit 1092 includes the 22nd
Resistance R22 and the 23rd resistance R23.
In an embodiment of the utility model, second switch pipe Q2 is field-effect tube or triode；Field-effect tube
Grid, drain electrode and source electrode are respectively the controlled end, input terminal and output end of second switch pipe Q2；The base stage of triode, collection
Electrode and emitter are respectively the controlled end, input terminal and output end of second switch pipe Q2.
In an embodiment of the utility model, third switching tube Q3 is field-effect tube or triode；Field-effect tube
Grid, drain electrode and source electrode are respectively the controlled end, input terminal and output end of third switching tube Q3；The base stage of triode, collection
Electrode and emitter are respectively the controlled end, input terminal and output end of third switching tube Q3.
The operation principle of above-mentioned signal demodulating circuit and sensing device is described below in conjunction with Fig. 1-Fig. 3：
First, the external voltage for providing 24V, after electromagnetic interference suppression circuit, output is carried out to voltage regulator circuit
Decompression, the voltage that 5V is exported after decompression are powered to conversion module 109；Secondly, sawtooth is generated by oscillating waveform module 101
Wave, and sine wave is exported after the second filter module 102 is filtered sawtooth wave, and it is provided with overvoltage protective module
103 prevent the voltage jump of sine wave；Due to having added sinusoidal excitation signal in the primary coil of linear displacement transducer LVDT, then
Produce electromagnetic field so that the soft magnetic bodies iron core in coil is magnetized, and influences the magnetic field in coil, when iron core moves in coil
When, secondary coil can export the AC signal directly proportional to displacement；Two groups of secondary AC signal amplitudes are smaller, on the one hand logical
It crosses operational amplifying module 105 and processing is amplified to the AC signal, obtain the signal of higher magnitude, on the other hand by comparing
Module 106 generates pulse for phase sensitive detection module；Amplified secondary alternating voltage is sent into phase sensitive detection module 107, so that
AC signal rectification is pulsating direct current signal；Fall larger wave to pulsating direct current target signal filter using the first filter module 108
Line, and d. c. voltage signal is exported, which is given negative by the current signal of output 4mA-20mA after conversion module
Carry power supply.The circuit complete machine electric current is small, and protection circuit function is perfect, and the operation is stable uses negative-feedback circuit, and output current is not
Change with load.
In conclusion the utility model embodiment provides signal demodulating circuit and sensing device, the signal demodulating circuit
Including operational amplifying module, comparison module, phase sensitive detection module, filter module and conversion module, pass through operational amplifying module
After being amplified to received signal and being compared to the signal by comparing module, then pass through phase sensitive detection module rectification
At direct current signal, filter module is filtered the direct current signal and exports d. c. voltage signal, will eventually by conversion module
D. c. voltage signal is transformed into predetermined DC current signal powering load.It is thus achieved that being amplified, comparing, filtering to signal
The effect of predetermined DC current signal powering load, the circuit stability are exported after wave rectification and conversion process；And turning
It changes the mold and is provided with feedback unit in block, so that the signal of output does not change with the variation of load, therefore solve output with negative
The problem of carrying variation.Therefore it is whole to solve in existing signal demodulating circuit the alternating voltage progress export to secondary coil
Stream filtering, leads to the unstable problem of circuit occur.Secondly, it is provided with overvoltage protective module in exciting circuit, realizes pair
Pumping signal carries out the effect of overvoltage protection.The utility model embodiment is realized simply, need not increase additional hardware, can have
Effect reduces cost, has stronger usability and practicality.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
All any modification, equivalent and improvement etc., should be included in the utility model made by within the spirit and principle of utility model
Protection domain within.
Claims (21)
1. a kind of signal demodulating circuit, for after receiving signal and carrying out demodulation process to it, predetermined DC electricity to be provided to load
Flow signal, which is characterized in that the signal demodulating circuit includes：
Operational amplifying module for being amplified processing to the signal；
Comparison module for being compared simultaneously output pulse signal to the signal；
It is connected with the operational amplifying module and the comparison module, it is whole for being carried out to the signal after enhanced processing
Flow and export the phase sensitive detection module of direct current signal；
It is connected with the output end of the phase sensitive detection module, for exporting DC voltage after being filtered to the direct current signal
First filter module of signal；And
It is connected with the output end of first filter module, for the d. c. voltage signal to be converted to the predetermined DC
The conversion module of current signal；
Wherein, the conversion module includes conversion processing unit and feedback unit, and the feedback unit is used for the conversion
The signal of reason unit output feeds back to the input terminal of the conversion processing unit, so that the predetermined DC current signal of output
Do not change with the variation of the load.
2. signal demodulating circuit as described in claim 1, which is characterized in that the operational amplifying module includes：
8th resistance, the 9th resistance, the tenth resistance and third operational amplifier；
The first end reception signal of the first end of 8th resistance and the 9th resistance, the second of the 8th resistance
End, the second end of the 9th resistance, the first end of the tenth resistance and the anti-phase input of the third operational amplifier
End connects altogether, and the second end of the tenth resistance connects and with the output end of the third operational amplifier as the operation amplifier altogether
The output end of module, the positive input end grounding of the third operational amplifier.
3. signal demodulating circuit as described in claim 1, which is characterized in that the comparison module includes：
Eleventh resistor, twelfth resistor, comparator and the 5th capacitance；
The first end of the eleventh resistor and the first end of the twelfth resistor receive the signal, the eleventh resistor
The second termination comparator inverting input, the positive input of the second termination comparator of the twelfth resistor
End, the output of the comparator terminate the first end of the 5th capacitance, and the second end of the 5th capacitance is the relatively mould
The output end of block.
4. signal demodulating circuit as described in claim 1, which is characterized in that the phase sensitive detection module includes：
Thirteenth resistor, the 14th resistance, the 15th resistance, the 16th resistance, the 5th operational amplifier, the 5th diode and
First switch pipe；
The first end of the thirteenth resistor and the first end of the 14th resistance connect altogether and with the operational amplifying module phase
Connection, the first end of the second end of the thirteenth resistor and the 15th resistance and the 5th operational amplifier it is anti-
Phase input terminal connects altogether, and the second end and the output end of the 5th operational amplifier of the 15th resistance connect and altogether as described
The output end of phase sensitive detection module, the second end of the 14th resistance and the normal phase input end of the 5th operational amplifier with
And the input terminal of the first switch pipe connects altogether, the cathode of the 5th diode connects the comparison module, the five or two pole
The anode of pipe connects altogether with the first end of the 16th resistance and the controlled end of the first switch pipe, the 16th resistance
The output end of second end and the first switch pipe be grounded.
5. signal demodulating circuit as claimed in claim 4, which is characterized in that the first switch pipe is field-effect tube or three
Pole pipe；
Grid, drain electrode and the source electrode of the field-effect tube are respectively the controlled end of the first switch pipe, input terminal and defeated
Outlet；
Base stage, collector and the emitter of the triode be respectively the controlled end of the first switch pipe, input terminal and
Output end.
6. signal demodulating circuit as described in claim 1, which is characterized in that first filter module includes：
17th resistance, the 18th resistance, the 19th resistance, the 6th capacitance, the 7th capacitance and the 6th operational amplifier；
The first termination phase sensitive detection module of the 17th resistance, the second end of the 17th resistance, the described tenth
The first end of the first end of eight resistance, the first end of the 19th resistance and the 7th capacitance connects altogether, and the described 18th
The second end of resistance connects altogether with the first end of the 6th capacitance and the inverting input of the 6th operational amplifier, described
The second end of 19th resistance connects simultaneously altogether with the second end of the 6th capacitance and the output end of the 6th operational amplifier
As the output end of first filter module, the second end and the positive of the 6th operational amplifier of the 7th capacitance are defeated
Enter end ground connection.
7. signal demodulating circuit as described in claim 1, which is characterized in that the conversion processing unit includes：
21st resistance, the 24th resistance, the 25th resistance, the 7th operational amplifier, second switch pipe and third
Switching tube；
First termination first filter module of the 20th resistance, the second termination the 7th operation of the 20th resistance
The normal phase input end of amplifier, the output of the 7th operational amplifier terminates the first end of the 21st resistance, described
The second end of 21st resistance connects altogether with the input terminal of the second switch pipe and the controlled end of the third switching tube, institute
It states the controlled end of second switch pipe and the first end of the output end of the third switching tube and the 24th resistance connects altogether,
The output end of the second switch pipe and the second end of the 24th resistance and the first end of the 25th resistance
It connects altogether.
8. signal demodulating circuit as claimed in claim 7, which is characterized in that the second switch pipe is field-effect tube or three
Pole pipe；
Grid, drain electrode and the source electrode of the field-effect tube are respectively the controlled end of the second switch pipe, input terminal and defeated
Outlet；
Base stage, collector and the emitter of the triode be respectively the controlled end of the second switch pipe, input terminal and
Output end.
9. signal demodulating circuit as claimed in claim 7, which is characterized in that the third switching tube is field-effect tube or three
Pole pipe；
Grid, drain electrode and the source electrode of the field-effect tube are respectively the controlled end of the third switching tube, input terminal and defeated
Outlet；
Base stage, collector and the emitter of the triode be respectively the controlled end of the third switching tube, input terminal and
Output end.
10. signal demodulating circuit as claimed in claim 7, which is characterized in that the feedback unit includes the 22nd resistance
With the 23rd resistance；
The inverting input of first termination the 7th operational amplifier of the 22nd resistance, the 22nd resistance
Second end connect altogether with the second end of the 24th resistance and the first end of the 25th resistance, the described 20th
The first end of three resistance connects altogether with the second end of the 20th resistance and the normal phase input end of the 7th operational amplifier,
The second end and the second end of the 25th resistance of 23rd resistance connect and altogether as the defeated of the conversion module
Outlet.
11. a kind of sensing device, for providing predetermined DC current signal to load, which is characterized in that the sensing device packet
Include sensing element and such as claim 1-10 any one of them signal demodulating circuits；
The sensing element generates a sensing signal；
After the signal demodulating circuit receives the sensing signal and carries out signal demodulation process to it, the predetermined DC is exported
Current signal.
12. sensing device as claimed in claim 11, which is characterized in that the sensing device further includes exciting circuit, described
Exciting circuit is for generating a pumping signal；
The exciting circuit includes the oscillating waveform module for generating saw-shaped wave.
13. sensing device as claimed in claim 12, which is characterized in that the oscillating waveform module includes：
Reference voltage, first resistor, second resistance, 3rd resistor, the 4th resistance, the first operational amplifier and the first capacitance；
The output of the reference voltage terminates the first end of the first resistor, the second end of the first resistor, described second
The normal phase input end of the first end of resistance, the first end of the 3rd resistor and the first operation comparator connects altogether, described
The second end of 3rd resistor connects altogether with the output end of the first operation comparator and the first end of the 4th resistance, described
The inverting input of first operation comparator connects altogether with the second end of the 4th resistance and the first end of first capacitance
And it is grounded as the output end of oscillating waveform module, the second end of the second resistance and the second end of first capacitance.
14. sensing device as claimed in claim 12, which is characterized in that the sensing device includes circuit board；
The signal demodulating circuit and the exciting circuit are all set on the circuit board.
15. sensing device as claimed in claim 12, which is characterized in that the exciting circuit further includes：
It is connected with the output end of the oscillating waveform module, for exporting sine wave after being filtered to the saw-shaped wave
Two filter modules.
16. sensing device as claimed in claim 15, which is characterized in that second filter module includes：
5th resistance, the 6th resistance, the 7th resistance, the second capacitance, third capacitance, the 4th capacitance and second operational amplifier；
The first termination oscillating waveform module of the 5th resistance, second end and the 6th resistance of the 5th resistance
First end and the first end of second capacitance connect altogether, the second end of the 6th resistance and the first of the 7th resistance
The first end of end and the third capacitance connects altogether, the positive of the second end and the second operational amplifier of the 7th resistance
Input terminal connects altogether, the second end of second capacitance and the second end of the third capacitance and the second end of the 4th capacitance
Ground connection, the output end of the second operational amplifier are the output end of second filter module.
17. sensing device as claimed in claim 15, which is characterized in that the exciting circuit further includes：
It is connected with the output end of second filter module, the overvoltage protection mould for preventing the sine voltage mutation
Block.
18. sensing device as claimed in claim 17, which is characterized in that the overvoltage protective module includes：
First diode, the second diode, third diode and the 4th diode；
The anode of second diode connects the anode of the 4th diode, and the cathode of second diode connects described first
The cathode of the cathode of diode, the 4th diode connects the cathode of the third diode, the anode of first diode
With the plus earth of the third diode.
19. sensing device as claimed in claim 17, which is characterized in that the sensing element includes coil block, the line
Coil assembly includes primary coil and secondary coil；
The input of the primary coil terminates the overvoltage protective module, the output end ground connection of the primary coil；
The first output end and second output terminal of the secondary coil connect the operational amplifying module and the relatively mould respectively
Block.
20. sensing device as claimed in claim 12, which is characterized in that the sensing element includes：
Coil block, the coil block include primary coil and secondary coil, and the primary coil is for receiving the excitation
Signal, the secondary coil are connected to the signal demodulating circuit and export sensing signal；And
Iron core, the iron core is arranged to can the relatively described coil block movement.
21. sensing device as claimed in claim 11, which is characterized in that the sensing element is linear variable differential transformation
Device.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721888214.2U CN207622680U (en) | 2017-12-28 | 2017-12-28 | Signal demodulating circuit and sensing device |
| DE202018107381.8U DE202018107381U1 (en) | 2017-12-28 | 2018-12-21 | Signal demodulation circuit and scanner |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721888214.2U CN207622680U (en) | 2017-12-28 | 2017-12-28 | Signal demodulating circuit and sensing device |
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| CN207622680U true CN207622680U (en) | 2018-07-17 |
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| CN (1) | CN207622680U (en) |
| DE (1) | DE202018107381U1 (en) |
Cited By (3)
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| CN112798866A (en) * | 2020-12-31 | 2021-05-14 | 中天海洋系统有限公司 | Conductivity signal acquisition circuit and testing device |
| CN113534264A (en) * | 2021-06-29 | 2021-10-22 | 湖北警官学院 | Search explosion device and method based on battery self-discharge |
| CN114963558A (en) * | 2021-10-08 | 2022-08-30 | 青岛海尔新能源电器有限公司 | Device and method for isolating and adjusting load current and water heater |
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| CN109962680B (en) * | 2019-03-21 | 2023-05-30 | 西安联飞智能装备研究院有限责任公司 | Non-phase-sensitive demodulation circuit and demodulation method |
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| CN116155114B (en) * | 2023-04-19 | 2023-06-30 | 深圳市安和威电力科技股份有限公司 | Insulated DC-DC (direct current-direct current) regulating power supply control device based on IGBT (insulated Gate Bipolar transistor) |
| CN117250899A (en) * | 2023-10-24 | 2023-12-19 | 烟台长青微波科技有限公司 | Data acquisition instrument |
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2017
- 2017-12-28 CN CN201721888214.2U patent/CN207622680U/en active Active
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2018
- 2018-12-21 DE DE202018107381.8U patent/DE202018107381U1/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112798866A (en) * | 2020-12-31 | 2021-05-14 | 中天海洋系统有限公司 | Conductivity signal acquisition circuit and testing device |
| CN113534264A (en) * | 2021-06-29 | 2021-10-22 | 湖北警官学院 | Search explosion device and method based on battery self-discharge |
| CN114963558A (en) * | 2021-10-08 | 2022-08-30 | 青岛海尔新能源电器有限公司 | Device and method for isolating and adjusting load current and water heater |
| CN114963558B (en) * | 2021-10-08 | 2024-04-02 | 青岛海尔新能源电器有限公司 | Device and method for isolating and adjusting load current and water heater |
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| DE202018107381U1 (en) | 2019-01-23 |
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