CN105574982A - Magnetism reading device for coil magnetic core full bridge structure - Google Patents
Magnetism reading device for coil magnetic core full bridge structure Download PDFInfo
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- CN105574982A CN105574982A CN201610017242.0A CN201610017242A CN105574982A CN 105574982 A CN105574982 A CN 105574982A CN 201610017242 A CN201610017242 A CN 201610017242A CN 105574982 A CN105574982 A CN 105574982A
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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
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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
- H01F2038/143—Inductive couplings for signals
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- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Inspection Of Paper Currency And Valuable Securities (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The invention discloses a magnetism reading device for a coil magnetic core full bridge structure. The magnetism reading device is connected with a main processor of a false proof detection device, and includes a housing, wherein a permalloy shielding shell and a difference amplification module are arranged in the housing; a working window is arranged in the length direction of the permalloy shielding shell; a plurality of independent detection channels are arranged in the working window successively; each detection channel is a Wheatstone full bridge structure which is formed by four magnetic induction units; the Wheatstone full bridge structure is used for inducing changes of the magnetic field and outputting a differential voltage signal to a difference amplification module; and the difference amplification module can be used for restraining a common mode input signal and amplifying the differential mode input signal, and can output a magnetic characteristic false proof signal of an object to be detected to the main processor of the false proof detection device, so that the anti-electromagnetic interference performance of a domestic traditional coil+magnetic core type magnetic reading sensor and the signal to noise ratio of the output signal, and the performance requirement for the anti-electromagnetic interference performance of the magnetic reading sensor and the signal to noise ratio for the false proof detection device can be satisfied.
Description
Technical field
The present invention relates to anti-counterfeiting detection, recognition technology, particularly a kind of wound core full bridge structure read chinaware.
Background technology
Serial number, pattern ink and metallic airbag line on the multiple big banknote such as Renminbi, Euro, dollar are distributed with magnetic material, record magnetic feature anti-counterfeiting information.
Bank's automatic teller machine (ATM), high-grade currency examine cleaning-sorting machine are in order to judge the true and false of banknote, must be configured with can read magnetic characteristic anti-counterfeiting information on banknote read Magnetic Sensor, and processed by the banknote magnetic characteristic anti-counterfeiting information that sensor reads, thus identify the true and false and the denomination of institute's currency examine ticket.
The volume of bank's automatic teller machine (ATM), high-grade currency examine cleaning-sorting machine is large, function is many, the electromagnetic interference that its inner heavy-duty motor and various circuit board produce is comparatively large, has higher requirements to the signal to noise ratio (S/N ratio) of the electromagnetism interference performance and output signal of reading Magnetic Sensor.
Magnetic Sensor read by the indium antimonide semiconductor (MR) that current domestic high-grade currency examine cleaning-sorting machine, ATM in bank generally use Japanese MURATA company to produce.The signal to noise ratio (S/N ratio) of this semiconductor transducer electromagnetism interference performance and output signal is better, but price is very expensive.And domestic traditional coil+magnetic-core type reads Magnetic Sensor, although price is very cheap, but because each sense channel only has 1 or 2 coil+magnetic core Parallel opertation structures, make the signal to noise ratio (S/N ratio) of its electromagnetism interference performance and output signal poor, can only for low and middle-grade small-sized cash inspecting machine, and cannot for bank's automatic teller machine (ATM), high-grade currency examine cleaning-sorting machine.
In view of this, the prior art that domestic traditional coil+magnetic-core type reads Magnetic Sensor has yet to be improved and developed.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art part, what the object of the present invention is to provide a kind of wound core full bridge structure reads chinaware, be intended to solve the signal to noise ratio (S/N ratio) that existing coil+magnetic-core type reads Magnetic Sensor electromagnetism interference performance and output signal thereof poor, cannot problem on the anti-counterfeiting detection equipment such as bank's automatic teller machine (ATM), high-grade currency examine cleaning-sorting machine.
In order to achieve the above object, this invention takes following technical scheme:
A kind of wound core full bridge structure read chinaware, be connected with the primary processor of anti-counterfeiting detection equipment, described chinaware of reading comprises shell, permalloy shielding case and differential amplification module is provided with in described shell, length direction along permalloy shielding case is provided with operation window and in described operation window, is disposed with multiple independently sense channel, and each sense channel is the Hui Sitong full bridge structure be made up of 4 magnetic induction unit; Described Hui Sitong full bridge structure is used for the change output difference divided voltage signal of induced field in differential amplification module, described differential amplification module has suppression common mode input signal, amplify the function of differential input signal, and the magnetic feature anti-counterfeiting signal exporting thing to be checked is to the primary processor of anti-counterfeiting detection equipment.
Described wound core full bridge structure read in chinaware, described magnetic induction unit comprises a Nd-Fe-B magnet steel, a permalloy magnetic core, a gap copper sheet, a coil, is also provided with magnetic sheet in a permalloy between adjacent two magnetic induction unit; Wherein, magnetic sheet, gap copper sheet, coil composition magnetic loop in described Nd-Fe-B magnet steel, permalloy magnetic core, permalloy.
Described wound core full bridge structure read in chinaware, described gap copper piece clip being located in Nd-Fe-B magnet steel and permalloy between magnetic sheet, being formed the gathering throat of the magnetic information for reading thing to be checked, described permalloy magnetic core and coil are positioned at the below of described Nd-Fe-B magnet steel, in the partial insertion coil of described permalloy magnetic core.
Described wound core full bridge structure read in chinaware, described magnetic induction unit also comprises coil holder and binding post, and described coil winding is on described coil holder, and described binding post is arranged on described coil holder, and the two ends of described coil are wound on described binding post.
Described wound core full bridge structure read in chinaware, the common port of adjacent two coils shares a binding post.
Described wound core full bridge structure read in chinaware, the workplace of described shell is provided with two row's ferrites.
Described wound core full bridge structure read in chinaware, described differential amplification module comprises the first operational amplifier, the second operational amplifier, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the 11 resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, the 7th electric capacity, the 8th electric capacity, the 9th electric capacity and the tenth electric capacity, 4 magnetic induction unit are respectively the first magnetic induction unit, the second magnetic induction unit, the 3rd magnetic induction unit and the 4th magnetic induction unit, wherein, first magnetic induction unit is contrary with the polarity of the 3rd magnetic induction unit, second magnetic induction unit is contrary with the polarity of the 4th magnetic induction unit, described first magnetic induction unit is disposed adjacent with the second magnetic induction unit or the 4th magnetic induction unit, and described second magnetic induction unit is disposed adjacent with the 4th magnetic induction unit or the second magnetic induction unit, described first magnetic induction unit is connected the positive input terminal of the first operational amplifier successively with the common port of the 3rd magnetic induction unit with the first resistance by the first electric capacity, the not common end of the first magnetic induction unit and the not common end ground connection of the 3rd magnetic induction unit, described second magnetic induction unit is connected the negative input end of the first operational amplifier successively with the common port of the 4th magnetic induction unit with the second resistance by the second electric capacity, the not common end of the second magnetic induction unit and the not common end ground connection of the 4th magnetic induction unit, the negative input end of described first operational amplifier connects the output terminal of the first operational amplifier by the 4th resistance, described 4th electric capacity and the 4th resistor coupled in parallel, the positive input terminal of described first operational amplifier connects one end of the 6th electric capacity by the 3rd resistance, one end of 7th electric capacity, one end of 6th resistance and one end of the 7th resistance, the other end of described 7th electric capacity is connected feeder ear with the other end of the 7th resistance, the other end of described 6th electric capacity and the other end ground connection of the 6th resistance, described 3rd electric capacity and the 3rd resistor coupled in parallel, the output terminal of described first operational amplifier is connected with the 5th resistance the negative input end stating the second operational amplifier by the 5th electric capacity successively, the negative input end of the second operational amplifier connects the output terminal of the second operational amplifier by the 11 resistance, described tenth electric capacity and the 11 resistor coupled in parallel, the positive input terminal of described second operational amplifier connects one end of the 8th electric capacity by the 8th resistance, one end of 9th electric capacity, one end of 9th resistance and one end of the tenth resistance, the other end of described 8th electric capacity is connected feeder ear with the other end of the 9th electric capacity, the other end of the 9th resistance and the other end ground connection of the tenth resistance.
Described wound core full bridge structure read chinaware, also comprise circuit board and bonnet, described differential amplification module installation is on described circuit board, described binding post is arranged on circuit board, through described bonnet and is electrically connected with differential amplification module, described circuit board is provided with pin, is electrically connected with the primary processor of anti-counterfeiting detection equipment.
Described wound core full bridge structure read in chinaware, described circuit board is provided with epoxy resin insulating layers, and described epoxy resin insulating layers covers described differential amplification module, the end of binding post and a part for pin.
Described wound core full bridge structure read in chinaware, described sense channel is 16, the workplace of described shell is provided with 32 grooves coordinated with the erecting frame of anti-counterfeiting detection equipment.
Compared to prior art, wound core full bridge structure provided by the invention read chinaware, be connected with the primary processor of anti-counterfeiting detection equipment, described chinaware of reading comprises shell, permalloy shielding case and differential amplification module is provided with in described shell, length direction along permalloy shielding case is provided with operation window and in described operation window, is disposed with multiple independently sense channel, and each sense channel is the Hui Sitong full bridge structure be made up of 4 magnetic induction unit; Described Hui Sitong full bridge structure is used for the change output difference divided voltage signal of induced field in differential amplification module, described differential amplification module has suppression common mode input signal, amplify the function of differential input signal, and the magnetic feature anti-counterfeiting signal exporting thing to be checked is to the primary processor of anti-counterfeiting detection equipment.The present invention utilize by 4 independently magnetic induction unit form Wheatstone bridge induced field change produce differential voltage output, differential amplification module is utilized to have inhibiting effect to common mode input signal (i.e. electromagnetic interference signal), to the amplification principle of differential input signal (i.e. banknote magnetic signal), thus greatly increase the signal to noise ratio (S/N ratio) that domestic traditional coil+magnetic-core type reads Magnetic Sensor electromagnetism interference performance and output signal, the anti-counterfeiting detection equipment such as bank's automatic teller machine (ATM) or high-grade currency examine cleaning-sorting machine that reach are to the performance requirement reading Magnetic Sensor electromagnetism interference and signal to noise ratio (S/N ratio).
Accompanying drawing explanation
The cut-open view reading chinaware of the wound core full bridge structure that Fig. 1 provides for the embodiment of the present invention.
The front view reading chinaware of the wound core full bridge structure that Fig. 2 provides for the embodiment of the present invention.
The left view reading chinaware of the wound core full bridge structure that Fig. 3 provides for the embodiment of the present invention.
The vertical view reading chinaware of the wound core full bridge structure that Fig. 4 provides for the embodiment of the present invention.
The upward view reading chinaware of the wound core full bridge structure that Fig. 5 provides for the embodiment of the present invention.
The circuit diagram reading Hui Sitong full bridge structure and differential amplification module in chinaware of the wound core full bridge structure that Fig. 6 provides for the embodiment of the present invention.
Embodiment
What the invention provides a kind of wound core full bridge structure reads chinaware, be provided with 16 independently sense channels, each sense channel by 4 independently magnetic induction unit form Wheatstone bridge induced field change produce differential voltage export, the differential amplification module on circuit board is utilized to have inhibiting effect to common mode input signal (i.e. electromagnetic interference signal), to the amplification principle of work of differential input signal (i.e. banknote magnetic signal), thus greatly increase the signal to noise ratio (S/N ratio) that domestic traditional coil+magnetic-core type reads Magnetic Sensor electromagnetism interference performance and output signal, reach bank's automatic teller machine (ATM) or high-grade currency examine cleaning-sorting machine to the performance requirement reading Magnetic Sensor electromagnetism interference and signal to noise ratio (S/N ratio), there is good popularizing application prospect.
For making object of the present invention, technical scheme and effect clearly, clearly, developing simultaneously referring to accompanying drawing, the present invention is described in more detail for embodiment.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Wound core full bridge structure provided by the invention read chinaware, be connected with the primary processor of anti-counterfeiting detection equipment.Wherein, anti-counterfeiting detection equipment is bank's automatic teller machine (ATM), high-grade currency examine cleaning-sorting machine etc., and thing to be checked is the financial document of the band magnetic characteristics such as bank note, bank money, security.
Refer to Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5, the chinaware of reading of wound core full bridge structure of the present invention comprises shell 1, and the two ends of described shell are provided with screw cap 23 or screw, is fixed on cleaning-sorting machine so that will read chinaware installation.The end face of shell 1 adopts plain grinding lathe to grind out level and smooth workplace 33, is convenient to coordinate pressure emery wheel conveying banknote 32.Permalloy shielding case 2 and differential amplification module 14 is provided with in described shell.Described shell 1 is plastic casing, and the both sides of described shell are respectively fixed with permalloy shielding case 2 by 6 the first screws 21.
The described length direction along permalloy shielding case 2 is provided with operation window (in figure non-label) and in described operation window, is disposed with multiple independently sense channel, and each sense channel is the Hui Sitong full bridge structure 100 be made up of 4 magnetic induction unit.
In the present embodiment, described sense channel is 16, mates with the processor on bank's automatic teller machine (ATM), high-grade currency examine cleaning-sorting machine, thus accurately reads the magnetic characteristic information on banknote 32, accurately identifies the true and false and the face amount of banknote 32.Described Hui Sitong full bridge structure is used for the change output difference divided voltage signal of induced field in differential amplification module 14, described differential amplification module 14 has suppression common mode input signal, amplify the function of differential input signal, and the magnetic feature anti-counterfeiting signal exporting 16 tunnel things to be checked is to the primary processor of anti-counterfeiting detection equipment, the primary processor of anti-counterfeiting detection equipment, according to the true and false and the face amount of reading the magnetic information identification thing to be checked that chinaware feeds back, reaches the requirement of bank ATM and high-grade currency examine cleaning-sorting machine.
Please continue to refer to Fig. 1 to Fig. 5, described magnetic induction unit comprises Nd-Fe-B magnet steel 5, permalloy magnetic core 8, gap copper sheet 6, coil 9, is also provided with magnetic sheet 7 in a permalloy between adjacent two magnetic induction unit; Wherein, in described Nd-Fe-B magnet steel 5, permalloy magnetic core 8, permalloy, magnetic sheet 7, gap copper sheet 6, coil 9 form magnetic loop.
In the present embodiment, described gap copper sheet 6 being located in Nd-Fe-B magnet steel 5 and permalloy between magnetic sheet 7, forming the gathering throat of the magnetic information for reading thing to be checked, and gathering throat stretches out the operation window of permalloy shielding case 2.Described permalloy magnetic core 8 and coil 9 are positioned at the below of described Nd-Fe-B magnet steel 5, in the partial insertion coil 9 of described permalloy magnetic core 8.
Between permalloy shielding case 2 and permalloy magnetic core 8, be also provided with allumen magnetic core seat 3, allumen magnetic core seat 3 is fixed on permalloy shielding case 2 by the second screw.Namely allumen magnetic core seat 3 is arranged in the outside of permalloy magnetic sheet 7, and in permalloy, the bottom of magnetic sheet 7 is in adjacent two permalloys between magnetic sheet 7, and in permalloy, the top of magnetic sheet 7 is between adjacent two Nd-Fe-B magnet steels 5.
During concrete enforcement, described magnetic induction unit also can comprise coil holder 10 and binding post 11, and described coil 9 is wound on described coil holder 10, and described binding post 11 is arranged on described coil holder 10, and the two ends of described coil 9 are wound on described binding post 11.The common port of adjacent two coils 9 shares a binding post 11, and namely adjacent two magnetic induction unit have three binding posts 11, and middle binding post 11 is public binding post 11, and the end of permalloy magnetic core 8 inserts in coil holder 10, as shown in Figure 1.
Preferably, the workplace 33 of described shell is provided with two row's ferrites 4, ferrite 4 is 12, is positioned at the both sides of Nd-Fe-B magnet steel 5, reads chinaware friction durability for improving.
Please continue to refer to Fig. 1 to Fig. 5, described chinaware of reading also can comprise circuit board 13 and bonnet 12, described differential amplification module 14 is arranged on described circuit board 13, described binding post 11 is arranged on circuit board 13, through described bonnet 12 and is electrically connected with differential amplification module 14, described circuit board 13 is provided with pin 16, is electrically connected with the primary processor of anti-counterfeiting detection equipment.In the present embodiment, each sense channel arranges a pin 16,16 sense channels and has 16 pins 16, and therefore, 16 differential amplification modules 14 export 16 road banknote 32 magnetic signals to cleaning-sorting machine or ATM process.
In order to make circuit board 13 performance make stable and improve the security performance reading chinaware, circuit board 13 is provided with epoxy resin insulating layers 15, described epoxy resin insulating layers 15 covers described differential amplification module 14, the end of binding post 11 and a part for pin 16.
See also Fig. 1 to Fig. 6, specifically, each sense channel comprises 4 magnetic induction unit, is respectively: the first magnetic induction unit L1, the second magnetic induction unit L2, the 3rd magnetic induction unit L3 and the 4th magnetic induction unit L4.Wherein, first magnetic induction unit L1 is contrary with the polarity of the 3rd magnetic induction unit L3, second magnetic induction unit L2 is contrary with the polarity of the 4th magnetic induction unit L4, and described first magnetic induction unit L1 is disposed adjacent with the second magnetic induction unit L2 or the 4th magnetic induction unit L4.
That is: the first magnetic induction unit L1(or the second magnetic induction unit L2) export the 3rd magnetic induction unit L3(the 4th magnetic induction unit L4 while of increasing) export and reduce.In like manner, the 3rd magnetic induction unit L3(or the 4th magnetic induction unit L4) export the first magnetic induction unit L1(second magnetic induction unit L2 while of increasing) export and reduce.Therefore, first magnetic induction unit L1 and the 3rd magnetic induction unit L3(or the second magnetic induction unit L2 and the 4th magnetic induction unit L4) form push-pull bridge structure, produce two times of bridge voltages to export, improve the output sensitivity reading chinaware of described wound core full bridge structure.
4 magnetic induction unit are adopted symmetrical structure by the present invention, make differential amplification module 14 under the condition of circuit symmetrical, have very strong suppression zero point drift and restraint speckle and interference performance, the chinaware anti-electromagnetic interference capability of reading greatly enhancing described wound core full bridge structure improves its signal to noise ratio (S/N ratio).
Please continue to refer to Fig. 6, described differential amplification module 14 comprises the first operational amplifier A 1, second operational amplifier A 2, first resistance R1, the second resistance R2, the 3rd resistance 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, the 11 resistance R11, the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4, the 5th electric capacity C5, the 6th electric capacity C6, the 7th electric capacity C7, the 8th electric capacity C8, the 9th electric capacity C9 and the tenth electric capacity C10.
Wherein, first operational amplifier A 1, second operational amplifier A 2 accessible site is in chip piece, as: model is the double operational integrated chip of TP2412, the capacitance of described first electric capacity C1, the second electric capacity C2 is 0.1uF, and the capacitance of the 3rd electric capacity C3, the 4th electric capacity C4, the 6th electric capacity C6, the 7th electric capacity C7 and the tenth electric capacity C10 is 510pF.The capacitance of the 5th electric capacity C5 is 47nF, and the capacitance of the 8th electric capacity C8 and the 9th electric capacity C9 is 1nF.The resistance of the first resistance R1, the second resistance R2 and the 8th resistance R8 is 1K Ω, the resistance of the 3rd resistance R3, the 4th resistance R4 and the 11 resistance R11 is 200K Ω, the resistance of the 5th resistance R5 is 2K Ω, the resistance of the 6th resistance R6 and the 7th resistance R7 is 300K Ω, and the resistance of the 9th resistance R9 and the tenth resistance R10 is 390K Ω.
In the present embodiment, described first magnetic induction unit L1 is connected the positive input terminal of the first operational amplifier A 1 successively with the common port of the 3rd magnetic induction unit L3 with the first resistance R1 by the first electric capacity C1, the not common end of the first magnetic induction unit L1 and the not common end ground connection of the 3rd magnetic induction unit L3, described second magnetic induction unit L2 is connected the negative input end of the first operational amplifier A 1 successively with the common port of the 4th magnetic induction unit L4 with the second resistance R2 by the second electric capacity C2, the not common end of the second magnetic induction unit L2 and the not common end ground connection of the 4th magnetic induction unit L4, the negative input end of described first operational amplifier A 1 connects the output terminal of the first operational amplifier A 1 by the 4th resistance R4, described 4th electric capacity C4 is in parallel with the 4th resistance R4, the positive input terminal of described first operational amplifier A 1 connects one end of the 6th electric capacity C6 by the 3rd resistance R3, one end of 7th electric capacity C7, one end of 6th resistance R6 and one end of the 7th resistance R7, the other end of described 7th electric capacity C7 is connected feeder ear with the other end of the 7th resistance R7, the other end of described 6th electric capacity C6 and the other end ground connection of the 6th resistance R6, described 3rd electric capacity C3 is in parallel with the 3rd resistance R3, the output terminal of described first operational amplifier A 1 is connected with the 5th resistance R5 the negative input end stating the second operational amplifier A 2 by the 5th electric capacity C5 successively, the negative input end of the second operational amplifier A 2 connects the output terminal of the second operational amplifier A 2 by the 11 resistance R11, described tenth electric capacity C10 is in parallel with the 11 resistance R11, the positive input terminal of described second operational amplifier A 2 connects one end of the 8th electric capacity C8 by the 8th resistance R8, one end of 9th electric capacity C9, one end of 9th resistance R9 and one end of the tenth resistance R10, the other end of described 8th electric capacity C8 is connected feeder ear with the other end of the 9th electric capacity C9, the other end of the 9th resistance R9 and the other end ground connection of the tenth resistance R10.
To be connected with the common port of the 3rd magnetic induction unit L3 output one road voltage signal u1 be connected the positive input terminal of the first operational amplifier A 1 by the first magnetic induction unit L1.Second magnetic induction unit L2 is connected with the common port of the 4th magnetic induction unit L4 output one road voltage signal u2, and connects the negative input end of the first operational amplifier A 1.All the other ends ground connection respectively of L1, L3, L2, L4, undertaken the 2nd grade by the second operational amplifier A 2 and compare amplification, circuit total magnification is about 20,000 times.
Please continue to refer to Fig. 1 to Fig. 4, describedly read chinaware overall length 195 ± 0.2mm, height overall 31.3 ± 0.2mm, beam overall 15.9 ± 0.2mm, the workplace both sides of described cover top portion arrange the groove 22 having 32 long 5mm, dark 2mm, coordinate that to be convenient to paper money smooth and easy with the erecting frame on currency examine cleaning-sorting machine.The bottom of described shell is provided with 6 M2 nuts 24, is convenient to client and installs pcb board.
In the present embodiment, 16 sense channels composition magnetic core read ranges are about 176mm, arrange 16 independently sense channel be conducive to the magnetic characteristic anti-counterfeiting information that the serial number, pattern ink and the metallic airbag line that are distributed on breadth such as determinand such as banknote 32 grade record to separate that cleaning-sorting machine is exported in reading, ATM is convenient to carry out processing, identifying.
For a better understanding of the present invention, the principle of work of reading chinaware of composition graphs 1 to Fig. 6 to wound core full bridge structure of the present invention please be descend to be described in detail:
When currency examine cleaning-sorting machine or ATM work, the workplace reading chinaware that banknote 32 is against wound core full bridge structure by money pressing wheel 31 travels forward.Magnetic material in serial number on banknote 32, pattern ink and safety line, change Nd-Fe-B magnet steel 5 and middle magnetic sheet in magnetic induction unit and form density of line of magnetic force between gathering throat and distribution, thus causing the magnetic flux be made up of in magnetic loop magnetic sheet 7, permalloy magnetic core 8, coil 9 in a Nd-Fe-B magnet steel 5, gap copper sheet 6, permalloy to change, coil 9 produces induced electricity physical features thus and exports corresponding signal.Wheatstone bridge doubleway output is formed by above-mentioned 4 magnetic induction unit.Because banknote 32 successively arrives time and the position difference of 4 magnetic induction unit in described Wheatstone bridge, therefore, described Wheatstone bridge output voltage u1 ≠ u2, the described difference channel first order amplifies output voltage u0=200K Ω/1K Ω * (u1-u2)=200*(u1-u2), voltage difference (u1-u2) is amplified about 200 times by first order amplifier.First order amplifier output voltage u0 is again through second level amplifier amplification=200K Ω/2K Ω * u0=100*u0 about 100 times, and difference mode signal (u1-u2) exports through pin 1616 after always being amplified about 200*100=20000 times by described difference channel.Namely described difference channel has amplification to the banknote 32 magnetic feature anti-counterfeiting signal read.
Bank's automatic teller machine (ATM), the inner heavy-duty motor of high-grade currency examine cleaning-sorting machine and various circuit board 13 apart from described wound core full bridge structure to read chinaware workplace far away, the electromagnetic radiation that motor various circuit board 13 produces is identical to the interference of 4 magnetic induction unit in described Wheatstone bridge, then described Wheatstone bridge output common mode signal u1=u2, the described difference channel first order amplifies output voltage u0=200K Ω/1K Ω * (u1-u2)=0, second level amplifier export also be 0(Wheatstone bridge and difference channel parameter perfect symmetry time), namely described difference channel is to ATM in bank, the electromagnetic interference that the inner heavy-duty motor of high-grade currency examine cleaning-sorting machine and various circuit board 13 produce has inhibiting effect, thus greatly increase the signal to noise ratio (S/N ratio) that domestic traditional coil 9+ magnetic-core type reads Magnetic Sensor electromagnetism interference performance and output signal, reach bank's automatic teller machine (ATM) or high-grade currency examine cleaning-sorting machine to the performance requirement reading Magnetic Sensor electromagnetism interference and signal to noise ratio (S/N ratio).There is good popularizing application prospect.
Be understandable that, for those of ordinary skills, can be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, and all these change or replace the protection domain that all should belong to the claim appended by the present invention.
Claims (10)
1. a wound core full bridge structure read chinaware, be connected with the primary processor of anti-counterfeiting detection equipment, described chinaware of reading comprises shell, it is characterized in that, permalloy shielding case and differential amplification module is provided with in described shell, length direction along permalloy shielding case is provided with operation window and in described operation window, is disposed with multiple independently sense channel, and each sense channel is the Hui Sitong full bridge structure be made up of 4 magnetic induction unit; Described Hui Sitong full bridge structure is used for the change output difference divided voltage signal of induced field in differential amplification module, described differential amplification module has suppression common mode input signal, amplify the function of differential input signal, and the magnetic feature anti-counterfeiting signal exporting thing to be checked is to the primary processor of anti-counterfeiting detection equipment.
2. wound core full bridge structure according to claim 1 read chinaware, it is characterized in that, described magnetic induction unit comprises a Nd-Fe-B magnet steel, a permalloy magnetic core, a gap copper sheet, a coil, is also provided with magnetic sheet in a permalloy between adjacent two magnetic induction unit; Wherein, magnetic sheet, gap copper sheet, coil composition magnetic loop in described Nd-Fe-B magnet steel, permalloy magnetic core, permalloy.
3. wound core full bridge structure according to claim 2 read chinaware, it is characterized in that, described gap copper piece clip being located in Nd-Fe-B magnet steel and permalloy between magnetic sheet, being formed the gathering throat of the magnetic information for reading thing to be checked, described permalloy magnetic core and coil are positioned at the below of described Nd-Fe-B magnet steel, in the partial insertion coil of described permalloy magnetic core.
4. wound core full bridge structure according to claim 3 read chinaware, it is characterized in that, described magnetic induction unit also comprises coil holder and binding post, and described coil winding is on described coil holder, described binding post is arranged on described coil holder, and the two ends of described coil are wound on described binding post.
5. wound core full bridge structure according to claim 4 read chinaware, it is characterized in that, the common port of adjacent two coils shares a binding post.
6. wound core full bridge structure according to claim 1 read chinaware, it is characterized in that, the workplace of described shell is provided with two row's ferrites.
7. wound core full bridge structure according to claim 1 read chinaware, it is characterized in that, described differential amplification module comprises the first operational amplifier, the second operational amplifier, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the 11 resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, the 7th electric capacity, the 8th electric capacity, the 9th electric capacity and the tenth electric capacity, 4 magnetic induction unit are respectively the first magnetic induction unit, the second magnetic induction unit, the 3rd magnetic induction unit and the 4th magnetic induction unit, wherein, first magnetic induction unit is contrary with the polarity of the 3rd magnetic induction unit, second magnetic induction unit is contrary with the polarity of the 4th magnetic induction unit, described first magnetic induction unit is disposed adjacent with the second magnetic induction unit or the 4th magnetic induction unit, and described second magnetic induction unit is disposed adjacent with the 4th magnetic induction unit or the second magnetic induction unit, described first magnetic induction unit is connected the positive input terminal of the first operational amplifier successively with the common port of the 3rd magnetic induction unit with the first resistance by the first electric capacity, the not common end of the first magnetic induction unit and the not common end ground connection of the 3rd magnetic induction unit, described second magnetic induction unit is connected the negative input end of the first operational amplifier successively with the common port of the 4th magnetic induction unit with the second resistance by the second electric capacity, the not common end of the second magnetic induction unit and the not common end ground connection of the 4th magnetic induction unit, the negative input end of described first operational amplifier connects the output terminal of the first operational amplifier by the 4th resistance, described 4th electric capacity and the 4th resistor coupled in parallel, the positive input terminal of described first operational amplifier connects one end of the 6th electric capacity by the 3rd resistance, one end of 7th electric capacity, one end of 6th resistance and one end of the 7th resistance, the other end of described 7th electric capacity is connected feeder ear with the other end of the 7th resistance, the other end of described 6th electric capacity and the other end ground connection of the 6th resistance, described 3rd electric capacity and the 3rd resistor coupled in parallel, the output terminal of described first operational amplifier is connected with the 5th resistance the negative input end stating the second operational amplifier by the 5th electric capacity successively, the negative input end of the second operational amplifier connects the output terminal of the second operational amplifier by the 11 resistance, described tenth electric capacity and the 11 resistor coupled in parallel, the positive input terminal of described second operational amplifier connects one end of the 8th electric capacity by the 8th resistance, one end of 9th electric capacity, one end of 9th resistance and one end of the tenth resistance, the other end of described 8th electric capacity is connected feeder ear with the other end of the 9th electric capacity, the other end of the 9th resistance and the other end ground connection of the tenth resistance.
8. wound core full bridge structure according to claim 5 read chinaware, it is characterized in that, also comprise circuit board and bonnet, described differential amplification module installation is on described circuit board, described binding post is arranged on circuit board, through described bonnet and is electrically connected with differential amplification module, described circuit board is provided with pin, is electrically connected with the primary processor of anti-counterfeiting detection equipment.
9. wound core full bridge structure according to claim 8 read chinaware, it is characterized in that, described circuit board is provided with epoxy resin insulating layers, described epoxy resin insulating layers covers described differential amplification module, the end of binding post and a part for pin.
10. wound core full bridge structure according to claim 1 read chinaware, it is characterized in that, described sense channel is 16, the workplace of described shell is provided with 32 grooves coordinated with the erecting frame of anti-counterfeiting detection equipment.
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| CN105574982B (en) | 2018-09-25 |
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