CN206523921U - A kind of system for measuring inductance change - Google Patents
A kind of system for measuring inductance change Download PDFInfo
- Publication number
- CN206523921U CN206523921U CN201720152961.3U CN201720152961U CN206523921U CN 206523921 U CN206523921 U CN 206523921U CN 201720152961 U CN201720152961 U CN 201720152961U CN 206523921 U CN206523921 U CN 206523921U
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- resistance
- inductance
- module
- input
- partial pressure
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Abstract
The utility model belongs to measuring circuit technical field, there is provided a kind of system for measuring inductance change, inductance value changes for detecting tested inductance, system access power supply, the system includes pumping signal circuit, partial pressure device, impedance isolation module, follows filtration module, amplification module and detector, pumping signal circuit output pumping signal is transferred to tested inductance after partial pressure device carries out voltage division processing, so that tested inductance produces level signal with partial pressure device connection；Level signal sequentially after impedance isolation module carries out impedance isolation processing, follows filtration module to carry out following filtering process and amplification module to carry out signal enhanced processing, exports electric signal to detector；Detector determines whether the inductance value of tested inductance changes according to the situation of change of electric signal.The effect for the inductance value minor variations that can be accurately detected inductance is thus achieved, the detection mode is simple and easy to apply.
Description
Technical field
The utility model belongs to measuring circuit technical field, more particularly to a kind of system for measuring inductance change.
Background technology
True and false mirror is carried out in ATM (Automatic Teller Machine, automatic depositing-withdrawing) equipment, including to bank note
Other module, the module is specifically that magnetic signal, thickness of bank note of bank note etc. are measured, however, above-mentioned measurement is then
Judged indirectly by the change of inductance.For example：When being measured to the thickness of bank note, bank note can pass through floating in module
Dynamic disk roller, floating disk roller produces corresponding displacement because of the insertion of bank note and according to the thickness of bank note, and floating disk roller is a kind of
Metal magnetic conducting material, there is an inductance coil above floating disk roller, when magnetic conduction floating disk roller relative to inductance coil away from
During from changing, the change of coil inductance will be caused.Therefore, it be can be achieved by being measured to coil inductance to bank note
Thickness measure, still, due to inductance change it is more faint, the requirement to measuring circuit is higher.In the prior art, lead to
Often need artificially using universal meter measurement inductance to change, this kind method detection difficulty is big and accuracy is low.
Therefore, existing inductance measurement technique is existed because needing change artificially using universal meter measurement inductance, is led
The problem of causing big detection difficulty and low accuracy.
Utility model content
The purpose of this utility model is to provide a kind of system for measuring inductance change, it is intended to solve existing inductance measurement
Technology is existed because needing artificially to be measured the change of inductance using universal meter, causes detection difficulty big and accuracy is low asks
Topic.
The utility model provides a kind of system for measuring inductance change, and the system is used for the inductance for detecting tested inductance
Value changes, the system access power supply, the system includes：
Pumping signal circuit, partial pressure device, impedance isolation module, follow filtration module, amplification module and detector；
The input of the input of the pumping signal circuit and the impedance isolation module connects the power supply altogether, described to swash
Encourage the first end of the output termination partial pressure device of signal circuit, the second end of the partial pressure device and the tested inductance
The controlled end of first end and the impedance isolation module connects altogether, the second end ground connection of the tested inductance, the impedance isolation
The input of filtration module is followed described in the output termination of module, the output for following filtration module terminates the amplification module
Input, the input of the output termination detector of the amplification module；
The pumping signal circuit output pumping signal is transferred to described after the partial pressure device carries out voltage division processing
Tested inductance, so that the tested inductance produces level signal with the partial pressure device connection；The level signal is sequentially
Impedance isolation processing is carried out by the impedance isolation module, described follow filtration module to carry out following filtering process and described
Amplification module is carried out after signal enhanced processing, exports electric signal to the detector；The detector is according to the electric signal
Situation of change determines whether the inductance value of the tested inductance changes.
In summary, the utility model provides a kind of system for measuring inductance change, the electricity for detecting tested inductance
Inductance value changes, system access power supply, and the system includes pumping signal circuit, partial pressure device, impedance isolation module, follows filtering mould
Block, amplification module and detector, pumping signal circuit output pumping signal are transmitted after partial pressure device carries out voltage division processing
To tested inductance, so that tested inductance produces level signal with partial pressure device connection；Level signal sequentially by impedance every
Impedance isolation processing is carried out from module, follow filtration module to carry out following filtering process and amplification module to carry out at signal amplification
After reason, electric signal is exported to detector；Detector determines whether the inductance value of tested inductance is sent out according to the situation of change of electric signal
Changing.The effect for the inductance value minor variations that can be accurately detected inductance is thus achieved, the detection mode is simple and easy to apply, solved
Existing inductance measurement technique of having determined is existed because needing change artificially using universal meter measurement inductance, causes detection difficulty
The problem of big and accuracy is low.
Brief description of the drawings
A kind of structural representation of the system for measurement inductance change that Fig. 1 provides for the utility model embodiment.
A kind of exemplary circuit figure of the system for measurement inductance change that Fig. 2 provides for the utility model embodiment.
Embodiment
In order that the technical problems to be solved in the utility model, technical scheme and beneficial effect are more clearly understood, below
With reference to drawings and Examples, the utility model is further elaborated.It should be appreciated that specific implementation described herein
Example only to explain the utility model, is not used to limit the utility model.
A kind of system for measurement inductance change that the utility model embodiment is provided, is widely used in only needing to measure inductance
Precision change, but the scene of specific inductance numerical quantity need not be measured, pass through the output drive signal of pumping signal circuit 102
Tested inductance 109 is transferred to after partial pressure device 107 carries out voltage division processing, so that tested inductance 109 and the phase of partial pressure device 107
Junction produces level signal, and level signal sequentially carries out impedance isolation processing by impedance isolation module 103, follows filtering mould
Block 104 carries out following filtering process and amplification module 105 to carry out after signal enhanced processing, exports electric signal to detector 106,
So that detector 106 determines whether the inductance value of tested inductance 109 changes according to the situation of change of electric signal.
In order to illustrate technical scheme described in the utility model, illustrated below by specific embodiment.
Fig. 1 shows a kind of structure of the system for measurement inductance change that the utility model embodiment is provided, for the ease of
Illustrate, illustrate only the part related to the utility model embodiment, details are as follows：
The system of this kind measurement inductance change, the inductance value for detecting tested inductance 109 (Fig. 1 is represented using inductance L1)
Change, system access power supply 101, the system include pumping signal circuit 102, partial pressure device 107, impedance isolation module 103, with
With filtration module 104, amplification module 105 and detector 106.
The input of pumping signal circuit 102 connects power supply 101, pumping signal altogether with the input of impedance isolation module 103
The first end of the output termination partial pressure device 107 of circuit 102, the second end of partial pressure device 107 and the first end of tested inductance 109
And the controlled end of impedance isolation module 103 connects and forms port 108 altogether, the second end ground connection of inductance 109, impedance isolation are tested
The output termination of module 103 follows the input of filtration module 104, follows the output of filtration module 104 to terminate amplification module 105
Input, the input of the output termination detector 106 of amplification module 105.
The output drive signal of pumping signal circuit 102 is transferred to tested electricity after partial pressure device 107 carries out voltage division processing
Sense 109, so that tested inductance 109 produces level signal with the connection of partial pressure device 107 (i.e. port 108)；Level signal according to
Sequence carries out impedance isolation processing by impedance isolation module 103, follows filtration module 104 to carry out following filtering process and amplification
Module 105 is carried out after signal enhanced processing, exports electric signal to detector 106；Detector 106 is according to the situation of change of electric signal
It is determined that whether the inductance value of tested inductance 109 changes.
As the embodiment of the utility model one, the frequency of the pumping signal that above-mentioned pumping signal circuit 102 is exported, amplitude with
And dutycycle is adjustable；And give tested inductance 109 to provide the pumping signal of fixed frequency by pumping signal circuit 102, work as quilt
When the inductance value for surveying inductance 109 changes, it is only necessary to which tested inductance can be determined by measuring the level value changes of above-mentioned port 108
Whether 109 inductance value changes.
Fig. 2 has gone out a kind of exemplary circuit of the system of measurement inductance change of the utility model embodiment offer, in order to just
In explanation, the part related to the utility model embodiment is illustrate only, details are as follows：
As the embodiment of the utility model one, above-mentioned pumping signal circuit 102 includes exciting signal source, and (Fig. 2 uses pulse
Waveform is represented), resistance R0 and first switch pipe (Fig. 2 is represented using triode Q1)；The output terminating resistor of exciting signal source
R0 first end, the controlled end of resistance R0 the second termination first switch pipe, the input of first switch pipe is pumping signal electricity
The input on road 102, the output end of first switch pipe is the output end of pumping signal circuit 102.
Wherein, first switch pipe is specially triode or FET, as long as can reach that the function of switch also may be used.
Base stage, colelctor electrode and the emitter stage of triode correspond to controlled end, input and the output end of above-mentioned first switch pipe respectively；
Grid, drain electrode and the source electrode of FET correspond to controlled end, input and the output end of above-mentioned first switch pipe respectively.
As the embodiment of the utility model one, above-mentioned partial pressure device 107 includes divider resistance R1；The first of divider resistance R1
End and the second end are respectively first end and the second end of partial pressure device 107.
As the embodiment of the utility model one, above-mentioned impedance isolation module 103 includes：(Fig. 2 uses three poles to second switch pipe
Pipe Q2 is represented), resistance R2, resistance R3 and electric capacity C1；The input of second switch pipe is the input of impedance isolation module 103
End, the controlled end of second switch pipe is the controlled end of impedance isolation module 103, the of the output terminating resistor R2 of second switch pipe
One end, resistance R2 the second end and resistance R3 first end and electric capacity C1 first end connect and as impedance isolation module altogether
103 output end, resistance R3 the second end is grounded with electric capacity C1 the second end.
Wherein, second switch pipe is specially triode or FET, as long as the function of impedance isolation can be reached
Also may be used.Base stage, colelctor electrode and the emitter stage of triode correspond to the controlled end of above-mentioned second switch pipe, input and defeated respectively
Go out end；Grid, drain electrode and the source electrode of FET correspond to controlled end, input and the output of above-mentioned second switch pipe respectively
End.
It is above-mentioned to follow filtration module 104 to include follower U1, resistance R4, resistance R5 as the embodiment of the utility model one
And electric capacity C2；Follower U1 normal phase input end is the input for following filtration module 104, follower U1 inverting input
Connect altogether with output end and resistance R4 first end, the first of resistance R4 the second end and resistance R5 first end and electric capacity C2
End is connect and as the output end for following filtration module 104 altogether, and resistance R5 the second end is grounded with electric capacity C2 the second end.
As the embodiment of the utility model one, above-mentioned amplification module 105 includes operational amplifier U2, resistance R6 and resistance
R7；Operational amplifier U2 normal phase input end is the input of amplification module 105, operational amplifier U2 inverting input and electricity
Hinder R6 first end and resistance R7 first end connects altogether, operational amplifier U2 output end connects simultaneously altogether with resistance R7 the second end
As the output end of amplification module 105, resistance R6 the second end is grounded.
As the embodiment of the utility model one, above-mentioned detector 106 (Fig. 2 is represented using PA1) can be specifically electric current inspection
Device or ammeter are surveyed, also may be used as long as possessing detection function of current.
A kind of above-mentioned operation principle for the system for measuring inductance change is illustrated below in conjunction with Fig. 1 and Fig. 2：
First, startup power supply VCC；Then, the pumping signal of the output of pumping signal circuit 102 fixed frequency passes through partial pressure electricity
Inductance L1 is transferred to behind resistance R1 and port 108；Because inductance L1 has hindrance function to AC signal, arteries and veins can be applied to coil
Impulse is encouraged, and divider resistance R1 output voltage also has ripple component, therefore, the electricity produced by triode Q2 to port 108
Ordinary mail number carries out impedance isolation；Then, level signal carries out partial pressure by resistance R2, resistance R3 and electric capacity C1 be filtered and
Follower U1 is carried out with subsequent, then carries out secondary filter by resistance R4, resistance R5 and electric capacity C2；Finally, further pass through
Resistance R6, resistance R7 and operational amplifier U2 carry out the enhanced processing of suitable multiple to filtered level signal, and export
Electric signal is to detector, so that detector determines whether the inductance value of tested inductance becomes according to the situation of change of electric signal
Change.Thus achieve and the effect measured is changed to inductance value relative weak, it is adaptable to which detection sensor is used as using inductance
Circuit and device.
In summary, the utility model embodiment provides a kind of system for measuring inductance change, for detecting tested electricity
The inductance value changes of sense, system access power supply, system includes pumping signal circuit, partial pressure device, impedance isolation module, followed
Filtration module, amplification module and detector, pumping signal circuit output pumping signal carry out voltage division processing by partial pressure device
After be transferred to tested inductance so that tested inductance produces level signal with partial pressure device connection；Level signal is sequentially passed through
Impedance isolation module carries out impedance isolation processing, follows filtration module to carry out following filtering process and amplification module to carry out signal
After enhanced processing, electric signal is exported to detector；Detector determines the inductance value of tested inductance according to the situation of change of electric signal
Whether change.The effect for the inductance value minor variations that can be accurately detected inductance is thus achieved, the detection mode is simple
It is easy, solve existing inductance measurement technique and exist because needing change artificially using universal meter measurement inductance, cause
Detection difficulty is big and the problem of low accuracy.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
Any modifications, equivalent substitutions and improvements made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (8)
1. a kind of system for measuring inductance change, the system is used for the inductance value changes for detecting tested inductance, the system connects
Enter power supply, it is characterised in that the system includes：
Pumping signal circuit, partial pressure device, impedance isolation module, follow filtration module, amplification module and detector；
The input of the input of the pumping signal circuit and the impedance isolation module connects the power supply, the excitation letter altogether
The first end of the output termination partial pressure device of number circuit, the second end of the partial pressure device and the first of the tested inductance
The controlled end of end and the impedance isolation module connects altogether, the second end ground connection of the tested inductance, the impedance isolation module
The output termination input for following filtration module, the output for following filtration module terminates the defeated of the amplification module
Enter end, the input of the output termination detector of the amplification module；
The pumping signal circuit output pumping signal is transferred to described tested after the partial pressure device carries out voltage division processing
Inductance, so that the tested inductance produces level signal with the partial pressure device connection；The level signal is sequentially passed through
The impedance isolation module carries out impedance isolation processing, described follows filtration module to carry out following filtering process and the amplification
Module is carried out after signal enhanced processing, exports electric signal to the detector；The detector is according to the change of the electric signal
Situation determines whether the inductance value of the tested inductance changes.
2. the system as claimed in claim 1, it is characterised in that the pumping signal circuit includes：
Exciting signal source, resistance R0 and first switch pipe；
The output termination resistance R0 of exciting signal source first end, the second termination described first of the resistance R0 is opened
The controlled end of pipe is closed, the input of the first switch pipe is the input of the pumping signal circuit, the first switch pipe
Output end be the pumping signal circuit output end.
3. system as claimed in claim 2, it is characterised in that the first switch pipe is triode or FET.
4. the system as claimed in claim 1, it is characterised in that the partial pressure device includes：
Divider resistance R1；
The first end of the divider resistance R1 and the second end are respectively first end and the second end of the partial pressure device.
5. the system as claimed in claim 1, it is characterised in that the impedance isolation module includes：
Second switch pipe, resistance R2, resistance R3 and electric capacity C1；
The input of the second switch pipe is the input of the impedance isolation module, and the controlled end of the second switch pipe is
The controlled end of the impedance isolation module, the output termination resistance R2 of second switch pipe first end, the resistance
R2 the second end connects and as the impedance isolation mode altogether with the first end of the resistance R3 and the first end of the electric capacity C1
The output end of block, the second end of the resistance R3 and the second end of the electric capacity C1 are grounded.
6. system as claimed in claim 5, it is characterised in that the second switch pipe is triode or FET.
7. the system as claimed in claim 1, it is characterised in that described to follow filtration module to include：
Follower U1, resistance R4, resistance R5 and electric capacity C2；
The normal phase input end of the follower U1 follows the input of filtration module, the anti-phase input of the follower U1 for described in
End connects altogether with the first end of output end and the resistance R4, the second end of the resistance R4 and resistance R5 first end with
And the first end of the electric capacity C2 connects and the output end of filtration module is followed described in altogether, the second end of the resistance R5 and institute
State electric capacity C2 the second end ground connection.
8. the system as claimed in claim 1, it is characterised in that the amplification module includes：
Operational amplifier U2, resistance R6 and resistance R7；
The normal phase input end of the operational amplifier U2 is the input of the amplification module, and the operational amplifier U2's is anti-phase
Input connects altogether with the first end of the resistance R6 and the first end of the resistance R7, the output end of the operational amplifier U2
Connect altogether with the second end of the resistance R7 and as the output end of the amplification module, the second end of the resistance R6 is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720152961.3U CN206523921U (en) | 2017-02-20 | 2017-02-20 | A kind of system for measuring inductance change |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720152961.3U CN206523921U (en) | 2017-02-20 | 2017-02-20 | A kind of system for measuring inductance change |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206523921U true CN206523921U (en) | 2017-09-26 |
Family
ID=59892785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720152961.3U Expired - Fee Related CN206523921U (en) | 2017-02-20 | 2017-02-20 | A kind of system for measuring inductance change |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206523921U (en) |
-
2017
- 2017-02-20 CN CN201720152961.3U patent/CN206523921U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170926 |
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| CF01 | Termination of patent right due to non-payment of annual fee |