CN105574982B - A kind of reading chinaware of wound core full bridge structure - Google Patents
A kind of reading chinaware of wound core full bridge structure Download PDFInfo
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- CN105574982B CN105574982B CN201610017242.0A CN201610017242A CN105574982B CN 105574982 B CN105574982 B CN 105574982B CN 201610017242 A CN201610017242 A CN 201610017242A CN 105574982 B CN105574982 B CN 105574982B
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- magnetic induction
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- induction unit
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/04—Testing magnetic properties of the materials thereof, e.g. by detection of magnetic imprint
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/14—Inductive couplings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/14—Inductive couplings
- H01F2038/143—Inductive couplings for signals
Abstract
The invention discloses a kind of reading chinawares of wound core full bridge structure, it is connect with the primary processor of anti-counterfeiting detection equipment, reading chinaware include shell, it is provided with permalloy shielding case and differential amplification module inside the shell, it is equipped with operation window along the length direction of permalloy shielding case and is disposed with multiple independent sense channels in operation window, each sense channel is the favour stone full bridge structure being made of 4 magnetic induction units；Favour stone full bridge structure is in the variation output difference voltage signal to differential amplification module of induced field, differential amplification module has suppression common mode input signal, amplify the function of differential input signal, and export primary processor of the magnetic feature anti-counterfeiting signal to anti-counterfeiting detection equipment of object to be checked, to greatly increase the signal-to-noise ratio that domestic traditional coil+magnetic-core type reads Magnetic Sensor electromagnetism interference performance and output signal, performance requirement of the anti-counterfeiting detection equipment to reading Magnetic Sensor electromagnetism interference and signal-to-noise ratio is reached.
Description
Technical field
The present invention relates to anti-counterfeiting detection, identification technology, more particularly to a kind of reading chinaware of wound core full bridge structure.
Background technology
In serial number, pattern ink and metallic airbag line on a variety of big banknotes such as RMB, Euro, dollar
It is distributed magnetic material, records magnetic feature anti-counterfeiting information.
Bank's automatic teller machine（ATM）, high-grade money-checking cleaning-sorting machine is to judge the true and false of banknote, it is necessary to configured with can read
The reading Magnetic Sensor of magnetic characteristic anti-counterfeiting information on banknote is taken, and the banknote magnetic characteristic anti-counterfeiting information that sensor is read carries out
Processing, the true and false and denomination of money-checking ticket to identify.
Bank's automatic teller machine（ATM）, the volume of high-grade money-checking cleaning-sorting machine is big, function is more, internal heavy-duty motor
And the electromagnetic interference that various circuit boards generate is larger, to reading the electromagnetism interference performance of Magnetic Sensor and the letter of output signal
It makes an uproar than having higher requirements.
Generally using the indium antimonide of MURATA companies of Japan production on high-grade money-checking cleaning-sorting machine domestic at present, ATM in bank
Semiconductor（MR）Read Magnetic Sensor.The noise of this semiconductor transducer electromagnetism interference performance and output signal is relatively good, but
Price is very expensive.And domestic traditional coil+magnetic-core type reads Magnetic Sensor, although price is very cheap, due to each inspection
It surveys channel and there was only 1 or 2 coils+magnetic core Parallel opertation structure, make the signal-to-noise ratio of its electromagnetism interference performance and output signal
It is poor, it is only used on low and middle-grade small-sized cash inspecting machines, and it is not used to bank's automatic teller machine（ATM）, high-grade money-checking sorting
On machine.
In view of this, domestic traditional coil+magnetic-core type reads Magnetic Sensor, the existing technology needs to be improved and developed.
Invention content
Place in view of above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a kind of wound core full bridge structures
Read chinaware, it is intended to which the noise for solving existing coil+magnetic-core type reading Magnetic Sensor electromagnetism interference performance and its output signal compares
Difference is not used to bank's automatic teller machine（ATM）, problem in the anti-counterfeiting detections equipment such as high-grade money-checking cleaning-sorting machine.
In order to achieve the above object, this invention takes following technical schemes：
A kind of reading chinaware of wound core full bridge structure, connect with the primary processor of anti-counterfeiting detection equipment, the reading magnetic
Device includes shell, and permalloy shielding case and differential amplification module are provided in the shell, along permalloy shielding case
Length direction is equipped with operation window and is disposed with multiple independent sense channels in the operation window, each to detect
Channel is the favour stone full bridge structure being made of 4 magnetic induction units；The favour stone full bridge structure is used for the change of induced field
Change in output difference voltage signal to differential amplification module, the differential amplification module has suppression common mode input signal, amplification
The function of differential input signal, and export primary processor of the magnetic feature anti-counterfeiting signal to anti-counterfeiting detection equipment of object to be checked.
In the reading chinaware of the wound core full bridge structure, the magnetic induction unit includes a Nd-Fe-B magnet steel, a slope
Not alloy core, a gap copper sheet, a coil are additionally provided with magnetic sheet in a permalloy between two neighboring magnetic induction unit；
Wherein, magnetic sheet, gap copper sheet, coil form magnetic loop in the Nd-Fe-B magnet steel, permalloy magnetic core, permalloy.
In the reading chinaware of the wound core full bridge structure, the gap copper piece clip is set to Nd-Fe-B magnet steel and perm closes
In gold between magnetic sheet, the gathering throat of magnetic information for reading object to be checked is formed, the permalloy magnetic core and coil are located at
The lower section of the Nd-Fe-B magnet steel, in the partial insertion coil of the permalloy magnetic core.
In the reading chinaware of the wound core full bridge structure, the magnetic induction unit further includes coil holder and binding post, institute
Coil winding is stated on the coil holder, the binding post is set on the coil holder, and the both ends of the coil are wound in described connect
On terminal.
In the reading chinaware of the wound core full bridge structure, the common end of two neighboring coil shares a binding post.
In the reading chinaware of the wound core full bridge structure, two rows of ferrites are provided on the working face of the shell.
In the reading chinaware of the wound core full bridge structure, the differential amplification module include the first operational amplifier,
Second operational amplifier, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th electricity
Resistance, the 8th resistance, the 9th resistance, the tenth resistance, eleventh resistor, the first capacitance, the second capacitance, third capacitance, the 4th capacitance,
5th capacitance, the 6th capacitance, the 7th capacitance, the 8th capacitance, the 9th capacitance and the tenth capacitance；4 magnetic induction units are respectively
One magnetic induction unit, the second magnetic induction unit, third magnetic induction unit and the 4th magnetic induction unit, wherein the first magnetic induction list
Member is with the polarity of third magnetic induction unit on the contrary, the polarity of the second magnetic induction unit and the 4th magnetic induction unit is on the contrary, described the
One magnetic induction unit is disposed adjacent with the second magnetic induction unit or the 4th magnetic induction unit, the second magnetic induction unit and the 4th
Magnetic induction unit or the second magnetic induction unit are disposed adjacent；The common end of the first magnetic induction unit and third magnetic induction unit
Pass sequentially through the positive input terminal that the first capacitance connects the first operational amplifier with first resistor, the first magnetic induction unit it is not common
End and the not common end of third magnetic induction unit are grounded, the common end of the second magnetic induction unit and the 4th magnetic induction unit according to
The secondary negative input end for connecting the first operational amplifier with second resistance by the second capacitance, the not common end of the second magnetic induction unit
It is grounded with the not common end of the 4th magnetic induction unit, the negative input end of first operational amplifier passes through the 4th resistance connection the
The output end of one operational amplifier, the 4th capacitance and the 4th resistor coupled in parallel；The positive input terminal of first operational amplifier
By 3rd resistor connect one end of the 6th capacitance, one end of the 7th capacitance, the 6th resistance one end and the 7th resistance one end,
The other end of 7th capacitance and the other end of the 7th resistance connect feeder ear, the other end of the 6th capacitance and the 6th electricity
The other end of resistance is grounded, and the third capacitance is in parallel with 3rd resistor, and the output end of first operational amplifier passes sequentially through
The negative input end of second operational amplifier is stated in 5th capacitance and the connection of the 5th resistance, and the negative input end of second operational amplifier passes through
Eleventh resistor connects the output end of second operational amplifier, and the tenth capacitance is in parallel with eleventh resistor, second fortune
Calculate amplifier positive input terminal by the 8th resistance connect one end of the 8th capacitance, one end of the 9th capacitance, the 9th resistance one
The one end at end and the tenth resistance, the other end of the 8th capacitance and the other end of the 9th capacitance connect feeder ear, the 9th resistance
The other end and the tenth resistance the other end ground connection.
The reading chinaware of the wound core full bridge structure, further includes circuit board and rear cover, and the differential amplification module is set
It is placed on the circuit board, the binding post is set on circuit board, is electrically connected with differential amplification module across the rear cover, institute
It states and is provided with pin on circuit board, be electrically connected with the primary processor of anti-counterfeiting detection equipment.
In the reading chinaware of the wound core full bridge structure, epoxy resin insulating layers, institute are provided on the circuit board
It states epoxy resin insulating layers and covers the differential amplification module, the end of binding post and a part for pin.
In the reading chinaware of the wound core full bridge structure, the sense channel is 16, the working face of the shell
On be provided with 32 and anti-counterfeiting detection equipment mounting bracket cooperation grooves.
Compared to the prior art, the reading chinaware of wound core full bridge structure provided by the invention, with anti-counterfeiting detection equipment
Primary processor connects, and the reading chinaware includes shell, and permalloy shielding case and differential amplification are provided in the shell
Module is equipped with operation window along the length direction of permalloy shielding case and is disposed in the operation window multiple only
Vertical sense channel, each sense channel are the favour stone full bridge structure being made of 4 magnetic induction units；The favour stone full-bridge
Structure is in the variation output difference voltage signal to differential amplification module of induced field, the differential amplification module to have suppression
Common mode input signal processed, amplifies the function of differential input signal, and exports the magnetic feature anti-counterfeiting signal of object to be checked to anti-counterfeiting detection
The primary processor of equipment.The present invention utilizes the variation for being made of Wheatstone bridge induced field 4 independent magnetic induction units to produce
Raw differential voltage output, has using differential amplification module to common mode input signal（That is electromagnetic interference signal）Inhibition make
With, to differential input signal（That is banknote magnetic signal）Amplification principle, to greatly increase domestic traditional coil+
Magnetic-core type reads the signal-to-noise ratio of Magnetic Sensor electromagnetism interference performance and output signal, has reached bank's automatic teller machine（ATM）
Or the anti-counterfeiting detections equipment such as high-grade money-checking cleaning-sorting machine is to the performance requirement of reading Magnetic Sensor electromagnetism interference and signal-to-noise ratio.
Description of the drawings
Fig. 1 is the sectional view of the reading chinaware of wound core full bridge structure provided in an embodiment of the present invention.
Fig. 2 is the front view of the reading chinaware of wound core full bridge structure provided in an embodiment of the present invention.
Fig. 3 is the left view of the reading chinaware of wound core full bridge structure provided in an embodiment of the present invention.
Fig. 4 is the vertical view of the reading chinaware of wound core full bridge structure provided in an embodiment of the present invention.
Fig. 5 is the upward view of the reading chinaware of wound core full bridge structure provided in an embodiment of the present invention.
Fig. 6 is favour stone full bridge structure and difference in the reading chinaware of wound core full bridge structure provided in an embodiment of the present invention
The circuit diagram of amplification module.
Specific implementation mode
The present invention provides a kind of reading chinaware of wound core full bridge structure, is equipped with 16 independent sense channels, Mei Gejian
The variation generation differential voltage output that channel is made of Wheatstone bridge induced field 4 independent magnetic induction units is surveyed, is utilized
Differential amplification module on circuit board has to common mode input signal（That is electromagnetic interference signal）Inhibiting effect, to differential mode
Input signal（That is banknote magnetic signal）Amplification operation principle, read to greatly increase domestic traditional coil+magnetic-core type
The signal-to-noise ratio of Magnetic Sensor electromagnetism interference performance and output signal has reached bank's automatic teller machine（ATM）Or top grade is tested
Paper money cleaning-sorting machine has good popularizing application prospect to the performance requirement of reading Magnetic Sensor electromagnetism interference and signal-to-noise ratio.
To make the purpose of the present invention, technical solution and effect clearer, clear and definite, develop simultaneously embodiment pair referring to the drawings
The present invention is further described.It should be appreciated that described herein, specific examples are only used to explain the present invention, is not used to
Limit the present invention.
The reading chinaware of wound core full bridge structure provided by the invention, connect with the primary processor of anti-counterfeiting detection equipment.Its
In, anti-counterfeiting detection equipment is bank's automatic teller machine（ATM）, high-grade money-checking cleaning-sorting machine etc., object to be checked is bank note, bank bill
According to financial documents with magnetic characteristic such as, security.
It please referring to Fig.1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5, the reading chinaware of wound core full bridge structure of the invention includes shell 1,
The shell is provided at both ends with cap nut 23 or screw hole, is fixed on cleaning-sorting machine in order to read chinaware installation.The top of shell 1
Smooth working face 33 is ground using plain grinding lathe in face, convenient for conveying banknote 32 with combined pressure grinding wheel.It is arranged in the shell
There are permalloy shielding case 2 and differential amplification module 14.The shell 1 is plastic shell, and the both sides of the shell respectively pass through 6
First screw 21 is fixed with permalloy shielding case 2.
The length direction along permalloy shielding case 2 is equipped with operation window（Non- label in figure）And in the work
Multiple independent sense channels are disposed in window, each sense channel is the favour stone being made of 4 magnetic induction units
Full bridge structure 100.
In the present embodiment, the sense channel is 16, with bank's automatic teller machine（ATM）, high-grade money-checking cleaning-sorting machine
On processor matching, to accurately read banknote 32 on magnetic characteristic information, accurately identify the true and false and face amount of banknote 32.Institute
It states favour stone full bridge structure to be used in the variation output difference voltage signal to differential amplification module 14 of induced field, the difference
Amplification module 14 has suppression common mode input signal, amplifies the function of differential input signal, and the magnetic for exporting 16 tunnels object to be checked is special
Primary processor of the anti-counterfeiting signal to anti-counterfeiting detection equipment is levied, the primary processor of anti-counterfeiting detection equipment is believed according to the magnetic for reading chinaware feedback
Breath identifies the true and false and face amount of object to be checked, has reached the requirement of bank ATM and high-grade money-checking cleaning-sorting machine.
Please continue to refer to Fig. 1 to Fig. 5, the magnetic induction unit includes a Nd-Fe-B magnet steel 5, a permalloy magnetic core 8, one
Gap copper sheet 6, a coil 9 are additionally provided with magnetic sheet 7 in a permalloy between two neighboring magnetic induction unit；Wherein, the neodymium
Magnetic sheet 7, gap copper sheet 6, coil 9 form magnetic loop in iron boron magnet steel 5, permalloy magnetic core 8, permalloy.
In the present embodiment, the gap copper sheet 6 is located in Nd-Fe-B magnet steel 5 and permalloy between magnetic sheet 7, forms use
In the gathering throat for the magnetic information for reading object to be checked, gathering throat stretches out the operation window of permalloy shielding case 2.The perm
Alloy core 8 and coil 9 are located at the lower section of the Nd-Fe-B magnet steel 5, in the partial insertion coil 9 of the permalloy magnetic core 8.
Allumen magnetic core seat 3, allumen are additionally provided between permalloy shielding case 2 and permalloy magnetic core 8
Magnetic core seat 3 is fixed on by the second screw on permalloy shielding case 2.I.e. allumen magnetic core seat 3 is located at magnetic in permalloy
The outside of plate 7, the lower part of magnetic sheet 7 is located in two neighboring permalloy between magnetic sheet 7 in permalloy, magnetic sheet in permalloy
7 top is between two neighboring Nd-Fe-B magnet steel 5.
When it is implemented, the magnetic induction unit may also include coil holder 10 and binding post 11, the coil 9 is wound in described
On coil holder 10, the binding post 11 is set on the coil holder 10, and the both ends of the coil 9 are wound on the binding post 11.
The common end of two neighboring coil 9 shares a binding post 11, i.e., two neighboring magnetic induction unit has there are three binding post 11, in
Between binding post 11 be public binding post 11, the end of permalloy magnetic core 8 is inserted into coil holder 10, as shown in Figure 1.
Preferably, being provided with two rows of ferrites 4 on the working face 33 of the shell, ferrite 4 is 12, is located at neodymium iron boron
Chinaware friction durability is read in the both sides of magnet steel 5 for improving.
Please continue to refer to Fig. 1 to Fig. 5, the reading chinaware may also include circuit board 13 and rear cover 12, the differential amplification mould
Block 14 is set on the circuit board 13, and the binding post 11 is set on circuit board 13, is put with difference across the rear cover 12
Big module 14 is electrically connected, and is provided with pin 16 on the circuit board 13, is electrically connected with the primary processor of anti-counterfeiting detection equipment.This reality
It applies in example, each sense channel setting one pin, 16,16 sense channels have 16 pins 16, and therefore, 16 difference are put
Big module 14 exports 16 road banknote, 32 magnetic signal to cleaning-sorting machine or ATM processing.
For the security performance for making 13 performance of circuit board make to stablize and improve reading chinaware, asphalt mixtures modified by epoxy resin is provided on circuit board 13
Fat insulating layer 15, the epoxy resin insulating layers 15 cover the differential amplification module 14, the end of binding post 11 and pin 16
A part,.
Also referring to Fig. 1 to Fig. 6, specifically, each sense channel includes 4 magnetic induction units, respectively：First
Magnetic induction unit L1, the second magnetic induction unit L2, third magnetic induction unit L3 and the 4th magnetic induction unit L4.Wherein, the first magnetic
The polarity of sensing unit L1 and third magnetic induction unit L3 on the contrary, the second magnetic induction unit L2 and the 4th magnetic induction unit L4 pole
Property is on the contrary, the first magnetic induction unit L1 is disposed adjacent with the second magnetic induction unit L2 or the 4th magnetic induction unit L4.
I.e.：First magnetic induction unit L1（Or the second magnetic induction unit L2）Output increases third magnetic induction unit L3 simultaneously
（4th magnetic induction unit L4）Output is reduced.Similarly, third magnetic induction unit L3（Or the 4th magnetic induction unit L4）Output increases
First magnetic induction unit L1 simultaneously（Second magnetic induction unit L2）Output is reduced.Therefore, the first magnetic induction unit L1 and third magnetic
Sensing unit L3（Or the second magnetic induction unit L2 and the 4th magnetic induction unit L4）Push-pull bridge structure is formed, two times of electric bridges are generated
Voltage output improves the output sensitivity of the reading chinaware of the wound core full bridge structure.
4 magnetic induction units are used symmetrical structure by the present invention, make differential amplification module 14 in the condition of circuit symmetrical
Under, there is very strong inhibition null offset and inhibit noise and interference performance, it is complete to greatly enhance the wound core
The reading chinaware anti-electromagnetic interference capability of bridge structure improves its signal-to-noise ratio.
Please continue to refer to Fig. 6, the differential amplification module 14 includes the first operational amplifier A 1, second operational amplifier
A2, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance
R7, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, eleventh resistor R11, the first capacitance C1, the second capacitance C2, third
Capacitance C3, the 4th capacitance C4, the 5th capacitance C5, the 6th capacitance C6, the 7th capacitance C7, the 8th capacitance C8, the 9th capacitance C9 and
Ten capacitance C10.
Wherein, the first operational amplifier A 1, second operational amplifier A2 can be integrated in chip piece, such as：Model
The double operational integrated chip of TP2412, the first capacitance C1, the second capacitance C2 capacitance be 0.1uF, third capacitance C3, the 4th
Capacitance C4, the 6th capacitance C6, the 7th capacitance C7 and the tenth capacitance C10 capacitance be 510pF.The capacitance of 5th capacitance C5 is
The capacitance of 47nF, the 8th capacitance C8 and the 9th capacitance C9 are 1nF.The resistance of first resistor R1, second resistance R2 and the 8th resistance R8
Value is 1K Ω, and the resistance value of 3rd resistor R3, the 4th resistance R4 and eleventh resistor R11 are 200K Ω, the resistance value of the 5th resistance R5
Resistance value for 2K Ω, the 6th resistance R6 and the 7th resistance R7 is that the resistance value of 300K Ω, the 9th resistance R9 and the tenth resistance R10 are
390KΩ。
In the present embodiment, the common end of the first magnetic induction unit L1 and third magnetic induction unit L3 pass sequentially through first
Capacitance C1 connects the positive input terminal of the first operational amplifier A 1 with first resistor R1, the not common end of the first magnetic induction unit L1 and
The not common end of third magnetic induction unit L3 is grounded, the common end of the second magnetic induction unit L2 and the 4th magnetic induction unit L4
Pass sequentially through the negative input end that the second capacitance C2 connects the first operational amplifier A 1 with second resistance R2, the second magnetic induction unit L2
Not common end and the 4th magnetic induction unit L4 not common end ground connection, the negative input end of first operational amplifier A 1 passes through
The output end of 4th the first operational amplifier A of resistance R4 connections 1, the 4th capacitance C4 are in parallel with the 4th resistance R4；Described
The positive input terminal of one operational amplifier A 1 by one end of the 6th capacitance C6 of 3rd resistor R3 connections, the 7th capacitance C7 one end,
One end of one end and the 7th resistance R7 of the 6th resistance R6, the other end of the other end and the 7th resistance R7 of the 7th capacitance C7
Connect feeder ear, the other end ground connection of the other end of the 6th capacitance C6 and the 6th resistance R6, the third capacitance C3 and the
Three resistance R3 are in parallel, and the output end of first operational amplifier A 1 passes sequentially through the 5th capacitance C5 and the 5th resistance R5 connections are stated
The negative input end of the negative input end of second operational amplifier A2, second operational amplifier A2 passes through eleventh resistor R11 connections
The output end of two operational amplifier As 2, the tenth capacitance C10 is in parallel with eleventh resistor R11, the second operational amplifier
The positive input terminal of A2 passes through one end of the 8th capacitance C8 of the 8th resistance R8 connections, one end of the 9th capacitance C9, the 9th resistance R9
One end of one end and the tenth resistance R10, the other end of the 8th capacitance C8 and the other end of the 9th capacitance C9 connect feeder ear,
The other end of 9th resistance R9 and the other end ground connection of the tenth resistance R10.
Being connected with the common end of third magnetic induction unit L3 by the first magnetic induction unit L1, voltage signal u1 is simultaneously all the way for output
Connect the positive input terminal of the first operational amplifier A 1.The common end of second magnetic induction unit L2 and the 4th magnetic induction unit L4 are connected
Output voltage signal u2, and the negative input end of the first operational amplifier A 1 of connection all the way.Distinguish at remaining end of L1, L3, L2, L4
Ground connection, carries out the 2nd grade by second operational amplifier A2 and compares amplification, circuit total magnification is about 20,000 times.
Please continue to refer to Fig. 1 to Fig. 4, the reading chinaware 195 ± 0.2mm of overall length, total high 31.3 ± 0.2mm, beam overall 15.9
± 0.2mm, the working face both sides setting of the cover top portion shares the groove 22 of 32 long 5mm, depth 2mm, with money-checking cleaning-sorting machine
On mounting bracket cooperation be convenient for walking paper money it is smooth.The bottom of the shell is provided with 6 M2 nuts 24, and pcb board is installed convenient for client.
In the present embodiment, 16 sense channel composition magnetic core read ranges are about 176mm, and the independent detection of setting 16 is logical
Road is conducive to will be distributed over the magnetic recorded on serial number, pattern ink and metallic airbag line on the equal determinands breadth of banknote 32
Property feature anti-counterfeiting information separately read output to cleaning-sorting machine, ATM be convenient for processing, identification.
In order to better understand the present invention, the reading magnetic to the wound core full bridge structure of the present invention in conjunction with Fig. 1 to Fig. 6 please be descend
The operation principle of device is described in detail：
When money-checking cleaning-sorting machine or ATM work, money pressing wheel 31 is by banknote 32 close to the reading chinaware of wound core full bridge structure
Working face travel forward.Magnetic material in serial number, pattern ink and safety line on banknote 32 changes magnetic induction unit
Middle Nd-Fe-B magnet steel 5 and middle magnetic sheet form density of line of magnetic force and distribution between gathering throat, so as to cause by a neodymium iron boron
Magnetic sheet 7, permalloy magnetic core 8, coil 9 form the magnetic flux in magnetic loop and generate change in magnet steel 5, gap copper sheet 6, permalloy
Change, thus coil 9 generates induced electricity topography output corresponding signal.Wheatstone bridge two-way is formed by above-mentioned 4 magnetic induction units
Output.Due to banknote 32 successively reach in the Wheatstone bridge 4 magnetic induction units time and position it is different, institute
Wheatstone bridge the output voltage u1 ≠ u2, difference channel first order amplification output voltage u0=200K Ω/1K Ω * stated
（u1-u2）=200*（u1-u2）, voltage difference（u1-u2）Amplify about 200 times by first order amplifier.First order amplifier output electricity
Press u0 again through second level amplifier amplification=about 100 times of 200K Ω/2K Ω * u0=100*u0, difference mode signal（u1-u2）By the difference
Parallel circuit exports after always amplifying about 200*100=20000 times through pin 1616.Banknote 32 magnetic of the i.e. described difference channel to reading
Feature anti-counterfeiting signal has amplification.
Bank's automatic teller machine（ATM）, heavy-duty motor and 13 distance of various circuit boards inside high-grade money-checking cleaning-sorting machine
Farther out, the electromagnetic radiation that the various circuit boards 13 of motor generate is to described for the reading chinaware working face of the wound core full bridge structure
The interference of 4 magnetic induction units is identical in Wheatstone bridge, then the Wheatstone bridge output common mode signal u1=u2, the difference
The parallel circuit first order amplifies output voltage u0=200K Ω/1K Ω *（u1-u2）=0, amplifier output in the second level is also 0（Favour stone
When electric bridge and difference channel parameter perfect symmetry）, i.e., the described difference channel is to big inside ATM in bank, high-grade money-checking cleaning-sorting machine
The electromagnetic interference that power motor and various circuit boards 13 generate has inhibiting effect, domestic traditional to greatly increase
Coil 9+ magnetic-core types read the signal-to-noise ratio of Magnetic Sensor electromagnetism interference performance and output signal, have reached bank's automatic teller machine
（ATM）Or high-grade money-checking cleaning-sorting machine is to the performance requirement of reading Magnetic Sensor electromagnetism interference and signal-to-noise ratio.It is promoted with good
Application prospect.
It, can according to the technique and scheme of the present invention and its hair it is understood that for those of ordinary skills
Bright design is subject to equivalent substitution or change, and all these changes or replacement should all belong to the guarantor of appended claims of the invention
Protect range.
Claims (8)
1. a kind of reading chinaware of wound core full bridge structure, connect with the primary processor of anti-counterfeiting detection equipment, the reading chinaware
Including shell, which is characterized in that permalloy shielding case and differential amplification module are provided in the shell, along permalloy
The length direction of shielding case is equipped with operation window and is disposed with multiple independent sense channels in the operation window,
Each sense channel is the favour stone full bridge structure being made of 4 magnetic induction units；The favour stone full bridge structure is for incuding
In the variation output difference voltage signal to differential amplification module in magnetic field, the differential amplification module has suppression common mode input letter
Number, amplify the function of differential input signal, and export main process task of the magnetic feature anti-counterfeiting signal to anti-counterfeiting detection equipment of object to be checked
Device；
The magnetic induction unit includes a Nd-Fe-B magnet steel, a permalloy magnetic core, a gap copper sheet, a coil, two neighboring
Magnetic sheet in a permalloy is additionally provided between magnetic induction unit；Wherein, the Nd-Fe-B magnet steel, permalloy magnetic core, perm
Magnetic sheet, gap copper sheet, coil form magnetic loop in alloy；
The gap copper piece clip is set in Nd-Fe-B magnet steel and permalloy between magnetic sheet, formation is believed for reading the magnetic of object to be checked
The gathering throat of breath, the permalloy magnetic core and coil are located at the lower section of the Nd-Fe-B magnet steel, the permalloy magnetic core
Partial insertion coil in.
2. the reading chinaware of wound core full bridge structure according to claim 1, which is characterized in that the magnetic induction unit is also
Including coil holder and binding post, on the coil holder, the binding post is set on the coil holder coil winding, the coil
Both ends be wound on the binding post.
3. the reading chinaware of wound core full bridge structure according to claim 2, which is characterized in that the public affairs of two neighboring coil
End shares a binding post altogether.
4. the reading chinaware of wound core full bridge structure according to claim 1, which is characterized in that the working face of the shell
On be provided with two rows of ferrites.
5. the reading chinaware of wound core full bridge structure according to claim 1, which is characterized in that the differential amplification module
Including the first operational amplifier, second operational amplifier, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th electricity
Resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, eleventh resistor, the first capacitance, the second capacitance,
Third capacitance, the 4th capacitance, the 5th capacitance, the 6th capacitance, the 7th capacitance, the 8th capacitance, the 9th capacitance and the tenth capacitance；4
Magnetic induction unit is respectively the first magnetic induction unit, the second magnetic induction unit, third magnetic induction unit and the 4th magnetic induction unit,
Wherein, the polarity of the first magnetic induction unit and third magnetic induction unit is on the contrary, the second magnetic induction unit and the 4th magnetic induction unit
Polarity on the contrary, the first magnetic induction unit is disposed adjacent with the second magnetic induction unit or the 4th magnetic induction unit, described
Two magnetic induction units are disposed adjacent with the 4th magnetic induction unit or the second magnetic induction unit；The first magnetic induction unit and third
The common end of magnetic induction unit passes sequentially through the positive input terminal that the first capacitance connects the first operational amplifier with first resistor, and first
The not common end of magnetic induction unit and the not common end ground connection of third magnetic induction unit, the second magnetic induction unit and the 4th magnetic
The common end of sensing unit passes sequentially through the negative input end that the second capacitance connects the first operational amplifier with second resistance, the second magnetic
The not common end of sensing unit and the not common end ground connection of the 4th magnetic induction unit, the negative input end of first operational amplifier
The output end of the first operational amplifier, the 4th capacitance and the 4th resistor coupled in parallel are connected by the 4th resistance；First fortune
Calculate amplifier positive input terminal by 3rd resistor connect one end of the 6th capacitance, one end of the 7th capacitance, the 6th resistance one
The one end at end and the 7th resistance, the other end of the 7th capacitance and the other end connection feeder ear of the 7th resistance, the described 6th
The other end of the other end of capacitance and the 6th resistance is grounded, and the third capacitance is in parallel with 3rd resistor, and first operation is put
The output end of big device passes sequentially through the 5th capacitance and the negative input end of second operational amplifier, the second operation are stated in the connection of the 5th resistance
The negative input end of amplifier connects the output end of second operational amplifier, the tenth capacitance and the 11st by eleventh resistor
Resistor coupled in parallel, the positive input terminal of the second operational amplifier connect one end, the 9th capacitance of the 8th capacitance by the 8th resistance
One end, the 9th resistance one end and the tenth resistance one end, the other end of the other end and the 9th capacitance of the 8th capacitance
Connect feeder ear, the other end of the 9th resistance and the other end ground connection of the tenth resistance.
6. the reading chinaware of wound core full bridge structure according to claim 3, which is characterized in that further include circuit board and after
Lid, the differential amplification module is set on the circuit board, the binding post is set on circuit board, pass through the rear cover with
Differential amplification module is electrically connected, and is provided with pin on the circuit board, is electrically connected with the primary processor of anti-counterfeiting detection equipment.
7. the reading chinaware of wound core full bridge structure according to claim 6, which is characterized in that be arranged on the circuit board
There are epoxy resin insulating layers, the epoxy resin insulating layers to cover the differential amplification module, the end of binding post and pin
A part.
8. the reading chinaware of wound core full bridge structure according to claim 1, which is characterized in that the sense channel is 16
It is a, 32 grooves coordinated with the mounting bracket of anti-counterfeiting detection equipment are provided on the working face of the shell.
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| CN113189655A (en) * | 2021-04-30 | 2021-07-30 | 上海领先仪器有限公司 | High anti-interference multichannel metal detection instrument |
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| CH679077A5 (en) * | 1989-03-01 | 1991-12-13 | Cendres & Metaux Sa | Machine readable cheque or credit card identification - uses soft magnetic ferromagnetic material and is fed through AC magnetic field |
| WO2008044162A2 (en) * | 2006-10-09 | 2008-04-17 | Koninklijke Philips Electronics N.V. | Magnetic sensor device with pairs of detection units |
| US7977941B2 (en) * | 2009-02-25 | 2011-07-12 | Everspin Technologies, Inc. | Magnetic field sensing device |
| CN201725379U (en) * | 2010-06-24 | 2011-01-26 | 深圳市怡化电脑有限公司 | ATM (Automatic Teller Machine) giant magneto resistance banknote testing magnetic head |
| CN102323554A (en) * | 2011-05-17 | 2012-01-18 | 杭州电子科技大学 | Integrated coil-biased giant magnetoresistance magneto-dependent sensor |
| CN103839320A (en) * | 2012-11-23 | 2014-06-04 | 北京嘉岳同乐极电子有限公司 | Magnetic sensor used for financial counterfeit detection machine and manufacturing method thereof |
| DE102012111986A1 (en) * | 2012-12-07 | 2014-06-12 | Sick Ag | RFID reading tunnel for the identification of objects by means of RFID |
| CN103886669B (en) * | 2012-12-20 | 2016-09-07 | 深圳粤宝电子科技有限公司 | The magnetic head of compatible soft or hard magnetic characteristic signal detection |
| CN203490762U (en) * | 2013-09-29 | 2014-03-19 | 深圳粤宝电子工业总公司 | Euro anti-counterfeiting magnetic head |
| CN203490759U (en) * | 2013-09-29 | 2014-03-19 | 深圳粤宝电子工业总公司 | Anti-counterfeiting detection magnetic head for both checks and banknotes |
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