CN109030618A - A kind of inversion electromagnetic field intelligent constant magnetic chip and permanent magnetic flaw detector - Google Patents
A kind of inversion electromagnetic field intelligent constant magnetic chip and permanent magnetic flaw detector Download PDFInfo
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- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
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Abstract
The invention discloses a kind of inversion electromagnetic field intelligent constant magnetic chips and permanent magnetic flaw detector, the inversion electromagnetic field intelligent constant magnetic chip includes Magnetic testi module, automatic control module and exciting current adjustment module, the voltage signal of external magnetic inductor input is detected by the Magnetic testi module, and average field strength signal is exported to automatic control module according to the voltage signal, according to the duty ratio size of the average field strength signal and default magnetic field intensity signal adjustment driving signal and exciting current adjustment module is output this to by the automatic control module, input dc power is reverse into alternating current by the exciting current adjustment module, and electromagnetic coil is output this to after adjusting the duty ratio size of alternating current according to driving signal, so that generating constant magnetic field strength by the electromagnetic coil that alternating current controls, and then guarantee instrument detection Sensitivity it is consistent.
Description
Technical field
The present invention relates to non-destructive detecting device technical field, in particular to a kind of inversion electromagnetic field intelligent constant magnetic chip and perseverance
Magnetic flaw detector.
Background technique
Magnetic powder flaw detector is a kind of for checking the instrument on ironwork surface and near surface flaw, is widely used in pressure appearance
In the manufacture of device, pressure pipeline, mechanized equipment etc., installation process.Current magnetic powder flaw detector has fixed magnetic powder flaw detector, shifting
Dynamic formula magnetic powder flaw detector and portable type magnetic powder flaw detector, and existing magnetic powder flaw detector is all that turning for magnetic energy is converted into using electric energy
Change mode, i.e. electric energy pass through transforming circuit transformation, are then converted into magnetic energy by electromagnetism winding and electromagnetic core again.
But the variation of input voltage, the variation of temperature, working time etc. can all cause to export in practical work process
The variation of magnetic energy.And 220V/50HZ alternating current, generator and charging electricity that the energy source for actually using occasion has power grid to provide
Pond.Wherein, there is fluctuation in network voltage, especially larger in field and live fluctuation range, can reach 160V -250V；Generator
Even more voltage fluctuation is greatly and frequent；And charged battery voltage is with electric quantity change, when lithium battery single-unit Full Charge Capacity, voltage is 4.2V,
Voltage is then 2.5V when 20% electricity.Also, temperature, that is, environment temperature in actual use also can be with season difference, day and night change
And it changes.Therefore, the magnetic energy of magnetic powder flaw detector output at present changes very greatly.And the size of magnetic energy directly affects instrument detection
Sensitivity, cause not check defect or find false defect, and then testing goal is not achieved.
Thus the prior art could be improved and improve.
Summary of the invention
Place in view of above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a kind of inversion electromagnetic field intelligent constant magnetic
Chip and permanent magnetic flaw detector, by the size of inversion electromagnetic field intelligent constant magnetic chip real-time control solenoid current, to obtain
By the constant magnetic field strength of iron core, and then guarantee the consistent of detector device detection sensitivity.
In order to achieve the above object, this invention takes following technical schemes:
In the inversion electromagnetic field intelligent constant magnetic chip, including Magnetic testi module, automatic control module and exciting current adjustment
Module, the voltage signal of external magnetic inductor input is detected by the Magnetic testi module, and is exported and put down according to the voltage signal
Equal magnetic field intensity signal is to automatic control module, by the automatic control module according to the average field strength signal and in advance
If the duty ratio size of magnetic field intensity signal adjustment driving signal simultaneously outputs this to exciting current adjustment module, by the excitation
Input dc power is reverse into alternating current by current regulating module, and according to general after the duty ratio size of driving signal adjustment alternating current
It is exported to electromagnetic coil, so that generating constant magnetic field strength by the electromagnetic coil that alternating current controls.
In the inversion electromagnetic field intelligent constant magnetic chip, the Magnetic testi module include filter unit, first voltage with
With device, second voltage follower, rectification unit, compensating unit and amplifying unit, the voltage signal that will test by filter unit into
Output exports after voltage signal is carried out voltage follow by first voltage follower to first voltage follower after row filtering processing
To rectification unit, voltage signal is subjected to after rectification processing output to compensating unit by rectification unit, by compensating unit by voltage
Output average field strength signal is to the second follower after signal carries out Integral Processing, by the second follower by average field strength
Output is to amplifying unit after signal carries out voltage follow, is amplified average field strength signal by amplifying unit defeated after processing
Out to automatic control module.
In the inversion electromagnetic field intelligent constant magnetic chip, the automatic control module includes control chip, low-pass filtering
The average field strength signal and default magnetic field intensity signal are filtered by unit and driving unit by low-pass filter unit
Output carries out modulus to average field strength signal and default magnetic field intensity signal by control chip and turns to control chip after processing
It changes after being calculated with PID and adjusts the duty ratio size of driving signal, and output this to driving unit, believed driving by driving unit
Output number is amplified after processing to exciting current adjustment module.
In the inversion electromagnetic field intelligent constant magnetic chip, the exciting current adjustment module include current limliting filter unit,
Power amplifier inversion unit and protection location, output is inverse to power amplifier after being filtered by current limliting filter unit to input dc power
Become unit, the input dc power is reverse into alternating current by power amplifier inversion unit, and alternating current is adjusted according to driving signal
Protection location is output this to after duty ratio size, stable alternating current is exported by protection location.
In the inversion electromagnetic field intelligent constant magnetic chip, the filter unit includes first resistor, second resistance and
One capacitor, one end connection IN signal end of the first resistor, one end of the other end connection second resistance of the first resistor,
One end of first capacitor and the normal phase input end of first voltage follower, the other end of the first capacitor and second resistance it is another
One end is grounded.
In the inversion electromagnetic field intelligent constant magnetic chip, the rectification unit includes 3rd resistor, the 4th resistance, first
Operational amplifier, first diode, the second diode, the 5th resistance, the 6th resistance, the 7th resistance, the second capacitor and the second fortune
Amplifier is calculated, one end of the 3rd resistor connects the output end and the first electricity of first voltage follower with one end of the 5th resistance
The inverting input terminal of follower is pressed, the other end of the 3rd resistor connects the cathode of one end of the 4th resistance, first diode
With the inverting input terminal of the first operational amplifier；The output end of first operational amplifier and the anode connection of first diode
The cathode of second diode, the other end of the 4th resistance and the anode of the second diode pass through the second fortune of the 6th resistance connection
Calculate the inverting input terminal of amplifier；The other end of 5th resistance, one end of the second capacitor are connected with one end of the 7th resistance
The inverting input terminal of second operational amplifier, the other end, the 7th resistance other end and the second operation amplifier of second capacitor
The output end of device connects compensating unit；The normal phase input end of first operational amplifier and the positive of second operational amplifier are defeated
Enter end to be grounded.
In the inversion electromagnetic field intelligent constant magnetic chip, the compensating unit includes third capacitor and the 8th resistance, institute
Third capacitor one end ground connection is stated, one end of the 8th resistance is connecting second voltage follower just with the other end of 3rd resistor
The other end of phase input terminal, the 8th resistance connects rectification unit.
In the inversion electromagnetic field intelligent constant magnetic chip, the amplifying unit includes the 9th resistance, the tenth resistance, the tenth
One resistance and third operational amplifier, the output end and second voltage follower of the 9th resistance connection second voltage follower
Inverting input terminal, the 9th resistance the other end connection third operational amplifier normal phase input end；Tenth resistance
One end the inverting input terminal of second operational amplifier, another termination of the tenth resistance are connected with one end of eleventh resistor
The other end on ground, the eleventh resistor connects automatic control module with the output end of third operational amplifier.
In the inversion electromagnetic field intelligent constant magnetic chip, the power amplifier inversion unit includes twelfth resistor, the 13rd
Resistance, the 14th resistance, the 15th resistance, the 16th resistance, the 17th resistance, the 18th resistance, the 19th resistance, the 20th
Resistance, the 21st resistance, the 22nd resistance, the 23rd resistance, the 4th capacitor, the 5th capacitor, the 6th capacitor, the 7th electricity
Appearance, third diode, the 4th diode, the first zener diode, the second zener diode, third zener diode, the 4th are surely
Diode, the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, third metal-oxide-semiconductor, the 4th metal-oxide-semiconductor, the first isolation drive chip, the second isolation is pressed to drive
1st foot of dynamic chip, third isolation drive chip, the 4th isolation drive chip, the first isolation drive chip passes through the tenth
Two resistance connect GAH signal end, and the 2nd foot of the first isolation drive chip is grounded, and the 3rd of the first isolation drive chip the
Foot, one end of the 14th resistance, the anode of the first zener diode, the first metal-oxide-semiconductor source electrode connect the first signal output end simultaneously
By the cathode of the 4th capacitance connection third diode, the 4th foot connection thirteenth resistor of the first isolation drive chip
One end；The other end of the thirteenth resistor, the other end of the 14th resistance and the first zener diode cathode connection the
The grid of one metal-oxide-semiconductor, the cathode of the 5th foot connection third diode of the first isolation drive chip, the third diode
Anode connection VCC signal end, the drain electrode of first metal-oxide-semiconductor connects VDC signal end with the drain electrode of the second metal-oxide-semiconductor；
1st foot of the second isolation drive chip connects GAL signal end, the second isolation drive core by the 15th resistance
One end of 2nd foot of piece and the 6th capacitor ground connection, the 3rd foot of the second isolation drive chip, one end of the 17th resistance, the
The source grounding of the anode of two zener diodes, the second metal-oxide-semiconductor, the 4th foot connection the tenth of the second isolation drive chip
One end of six resistance, the other end, the other end of the 17th resistance and the cathode of the second zener diode of the 16th resistance
Connect the grid of the second metal-oxide-semiconductor, the drain electrode of drain electrode the first metal-oxide-semiconductor of connection of second metal-oxide-semiconductor, the second isolation drive core
5th foot of piece connects the other end and the VCC signal end of the 6th capacitor；
1st foot of the third isolation drive chip connects GBH signal end, the third isolation drive core by the 18th resistance
2nd foot of piece is grounded, and the 3rd foot of the third isolation drive chip, one end of the 20th resistance, third zener diode are just
Pole, the source electrode connection second signal output end of third metal-oxide-semiconductor and by the cathode of the 4th diode of the 5th capacitance connection, described the
4th foot of three isolation drive chips connects one end of the 19th resistance；The other end of 19th resistance, the 20th resistance
The other end connects the grid of third metal-oxide-semiconductor with the cathode of third zener diode, and the 5th foot of the third isolation drive chip connects
Connect the cathode of the 4th diode, the anode connection VCC signal end of the 4th diode；
1st foot of the 4th isolation drive chip connects GBL signal end, the 4th isolation drive by the 21st resistance
One end of 2nd foot of chip and the 7th capacitor ground connection, the one of the 3rd foot of the 4th isolation drive chip, the 23rd resistance
End, the anode of the 4th zener diode, the 4th metal-oxide-semiconductor source grounding, the 4th isolation drive chip the 4th foot connection
One end of 22nd resistance, the other end of the 22nd resistance, the other end of the 23rd resistance and the 4th pressure stabilizing two
The cathode of pole pipe connects the grid of the 4th metal-oxide-semiconductor, and draining for the 4th metal-oxide-semiconductor connects the drain electrode of third metal-oxide-semiconductor, and the described 4th
5th foot of isolation drive chip connects the other end and the VCC signal end of the 7th capacitor.
It is a kind of perseverance magnetic flaw detector, including power module, for default magnetic field intensity signal to be converted into voltage signal form
It exports to adjustment of field excitation conversion module, magnetic inductor, electromagnetic coil and the iron core of inversion electromagnetic field intelligent constant magnetic chip, further includes
Inversion electromagnetic field intelligent constant magnetic chip as described above.
Compared to the prior art, a kind of inversion electromagnetic field intelligent constant magnetic chip provided by the invention and permanent magnetic flaw detector, institute
Stating inversion electromagnetic field intelligent constant magnetic chip includes Magnetic testi module, automatic control module and exciting current adjustment module, by described
Magnetic testi module detects the voltage signal of external magnetic inductor input, and exports average field strength letter according to the voltage signal
Number to automatic control module, believed by the automatic control module according to the average field strength signal and default magnetic field strength
Number adjustment driving signal duty ratio size and output this to exciting current adjustment module, by the exciting current adjustment module
Input dc power is reverse into alternating current, and outputs this to electromagnetism after adjusting according to driving signal the duty ratio size of alternating current
Coil so that generating constant magnetic field strength by the electromagnetic coil that alternating current controls, and then guarantees the sensitivity one of instrument detection
It causes.
Detailed description of the invention
Fig. 1 is the structural block diagram of inversion electromagnetic field intelligent constant magnetic chip provided by the invention.
Fig. 2 is the circuit diagram of the Magnetic testi module in inversion electromagnetic field intelligent constant magnetic chip provided by the invention.
Fig. 3 is the first low-pass filter, the second low-pass filtering in inversion electromagnetic field intelligent constant magnetic chip provided by the invention
The circuit diagram of device and control chip.
Fig. 4 is the circuit diagram of third low-pass filter in inversion electromagnetic field intelligent constant magnetic chip provided by the invention.
Fig. 5 is the circuit diagram of burning unit in inversion electromagnetic field intelligent constant magnetic chip provided by the invention.
Fig. 6 is the circuit diagram of voltage regulation unit in the inversion electromagnetic field intelligent constant magnetic chip of the invention mentioned.
Fig. 7 is the circuit diagram of oscillating unit in inversion electromagnetic field intelligent constant magnetic chip provided by the invention.
Fig. 8 is the waveform diagram of Magnetic testi unit each point in inversion electromagnetic field intelligent constant magnetic chip provided by the invention.
Fig. 9, Figure 10, Figure 11, Figure 12 are driving unit in the inversion electromagnetic field intelligent constant magnetic chip of the invention provided
Circuit diagram.
Figure 13 is the circuit diagram of power amplifier inversion unit in inversion electromagnetic field intelligent constant magnetic chip provided by the invention.
Figure 14 is the waveform diagram of power amplifier inversion unit output in inversion electromagnetic field intelligent constant magnetic chip provided by the invention.
Figure 15 is that digital PID calculates the flow chart adjusted in inversion electromagnetic field intelligent constant magnetic chip provided by the invention.
Figure 16 is the structural block diagram of permanent magnetic flaw detector provided by the invention.
Specific embodiment
The present invention provides a kind of inversion electromagnetic field intelligent constant magnetic chip and permanent magnetic flaw detector, passes through inversion electromagnetic field intelligent constant
The size of magnetic chip real-time control solenoid current to obtain the constant magnetic field strength for passing through iron core, and then guarantees flaw detection
Instrument detection sensitivity it is consistent.
To make the purpose of the present invention, technical solution and effect clearer, clear and definite, right as follows in conjunction with drawings and embodiments
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.
Referring to Fig. 1, inversion electromagnetic field intelligent constant magnetic chip provided by the invention, including Magnetic testi module 110, automatic control
Molding block 120 and exciting current adjustment module 130, the Magnetic testi module 110 connects automatic control module 120, described automatic
Control module 120 connects exciting current adjustment module 130, detects external magnetic inductor 170 by the Magnetic testi module 110 and inputs
Voltage signal, and average field strength signal is exported to automatic control module 120, by described automatic according to the voltage signal
Control module 120 is big according to the duty ratio of the average field strength signal and default magnetic field intensity signal adjustment driving signal
It is small and output this to exciting current adjustment module 130, input dc power is reverse by the exciting current adjustment module 130
Alternating current, and according to electromagnetic coil is output this to after the duty ratio size of driving signal adjustment alternating current, so that by alternating current
The electromagnetic coil of control generates constant magnetic field strength.
The present invention completes the real-time detection of magnetic field strength by Magnetic testi module 110, i.e., is detected by Magnetic testi module 110 outer
The voltage signal that portion's magnetic inductor 170 inputs, and average field strength signal is obtained after voltage signal is carried out conversion processing, then
It is big according to the duty ratio of average field strength signal and default magnetic field intensity signal adjustment driving signal by automatic control module 120
It is small, the size of alternating current duty ratio is adjusted according to driving signal by exciting current adjustment module 130 later, so that by alternating current controlled
The electromagnetic coil of system generates constant magnetic field strength, achievees the purpose that all permanent magnetic in any case.Preferably, institute in the present embodiment
Stating alternating current is square wave alternating-current electricity.
Specifically, inversion electromagnetic field intelligent constant magnetic chip provided by the invention further includes energy supply control module 140, the electricity
Source control module 140 is connect with automatic control module 120, Magnetic testi module 110 and exciting current adjustment module 130, in inversion
In the process of electromagnetic field intelligent constant magnetic chip work, height is provided for the work of modules by the energy supply control module 140
The accessory power supply of precision；Preferably, the energy supply control module 140 is efficient, high-precision Switching Power Supply, can effectively be protected
Demonstrate,prove the stability of inversion electromagnetic field intelligent constant magnetic chip work.
Further, referring to Fig. 2, the Magnetic testi module 110 include filter unit 111, first voltage follower A1,
Second voltage follower A4, rectification unit 112, compensating unit 113 and amplifying unit 114,111, first electricity of filter unit
Pressure follower A1, rectification unit 112, compensating unit 113, second voltage follower A4 and amplifying unit 114 are sequentially connected；By filtering
Output is followed to first voltage follower A1 by first voltage after the voltage signal that wave unit 111 will test is filtered
Output is rectified voltage signal by rectification unit 112 to rectification unit 112 after voltage signal is carried out voltage follow by device A1
Output exports average field strength after voltage signal is carried out Integral Processing by compensating unit 113 to compensating unit 113 after processing
Signal exports after average field strength signal is carried out voltage follow by the second follower to amplifying unit to the second follower
114, it exports after average field strength signal is amplified processing by amplifying unit 114 to automatic control module 120.
Specifically, the filter unit 111 is filtered voltage signal, that is, magnetic strength induction signal, filters out various spuious
Interference signal carries out voltage follow to filtered voltage signal by first voltage follower A1 later, to reduce voltage signal
Input impedance, obtain low-impedance voltage signal, then rectification is carried out to low-impedance voltage signal by rectification unit 112
It manages, is to take absolute value in the present embodiment to low-impedance voltage signal, after carrying out Integral Processing by compensating unit 113 again later
Accurate average field strength signal is obtained, faint average field strength signal is carried out by amplifying unit 114 immediately high-precision
Voltage follow is carried out through second voltage follower A4 again after the enhanced processing of degree, and then obtains low-impedance average field strength letter
Number, i.e., the processing such as the voltage signal that the present invention is detected by 110 Duis of Magnetic testi module is filtered, takes absolute value, integrates, with true
Guarantor obtains the average field strength signal of accurate stable, and then meets the requirement of subsequent conditioning circuit.
Further, Fig. 3 and Fig. 4 are please referred to, the automatic control module 120 includes control chip U1, low-pass filtering list
Member 121 and driving unit (showing in figure), the low-pass filter unit 121 and driving unit are connect with control chip U1；
Exported after being filtered the average field strength signal and default magnetic field intensity signal by low-pass filter unit 121 to
Chip U1 is controlled, analog-to-digital conversion and PID are carried out to average field strength signal and default magnetic field intensity signal by control chip U1
The duty ratio size of driving signal is adjusted after calculating, and outputs this to driving unit, is carried out driving signal by driving unit
It exports after enhanced processing to exciting current adjustment module 130.
The average field strength signal that Magnetic testi module 110 is exported by the low-pass filter unit 121 in the present embodiment
Output is to control chip U1 after being filtered again, to guarantee that average field strength signal stabilization is noiseless；At the same time
Output extremely control chip after low-pass filter unit 121 is also filtered supply voltage and default magnetic field intensity signal
U1 stablizes glitch-free default magnetic field intensity signal and supply voltage by control chip U1 reception, and simultaneously to average magnetic field
Strength signal and default magnetic field intensity signal carry out analog-to-digital conversion, and the calculation function of control chip U1 is then recycled to carry out number
PID is calculated, and according to the duty ratio of calculated result adjustment driving signal and output drive signal is to driving unit, will by driving unit
Output provides accurate, steady to exciting current adjustment module 130 after driving signal amplifies for exciting current adjustment module 130
Fixed, effective driving signal realizes the adjusting to magnetic field strength by automatic control module 120, to reach stationary magnetic field
Purpose.It can also be used certainly in other embodiments in the model DSPIC33FJ128MC710PF of the control chip U1
He is control chip U1 with the same function, and this is not limited by the present invention.
Preferably, Fig. 5, Fig. 6 and Fig. 7 are please referred to, the automatic control module 120 further includes burning unit 122, pressure stabilizing list
Member 123 and oscillating unit 124, the burning unit 122, voltage regulation unit 123 and oscillating unit 124 connect with control chip U1
It connects, and burning program is entered to control chip U1 by the burning unit 122, be the control chip U1 by voltage regulation unit 123
Analog-digital conversion process provides reference voltage, it is preferable that reference voltage described in the present embodiment is 3.1V；By the oscillating unit
124 guarantee the normal work of control chip U1.
Further, please continue to refer to Fig. 1, the exciting current adjustment module 130 include current limliting filter unit 131,
Power amplifier inversion unit 132 and protection location 133, the current limliting filter unit 131, power amplifier inversion unit 132 and protection location 133
It is sequentially connected；It is exported after being filtered by current limliting filter unit 131 to input dc power to power amplifier inversion unit 132,
The input dc power is reverse into alternating current by power amplifier inversion unit 132, and adjusts the duty of alternating current according to driving signal
Than outputting this to protection location 133 after size, stable alternating current is exported by protection location 133；Pass through the exciting current
Current limliting filter unit 131 in adjustment module 130 is filtered input dc power and current limliting handle to obtain stablize it is glitch-free
Direct current, later using power amplifier inversion unit 132 according to the driving signal exported in driving unit by DC inverter at square wave
Electricity output is exchanged to electromagnetic coil, and then electromagnetic coil is driven to generate the magnetic field of constant intensity, realizes inversion electromagnetic field intelligent constant
The permanent magnetic purpose of magnetic chip, to guarantee that the sensitivity of instrument detection is consistent；Wherein, the current limliting filter unit 131 and protection
Unit 133 is the prior art, therefore is not further described.
When it is implemented, please continue to refer to Fig. 2, the filter unit 111 includes first resistor R1, second resistance R2 and the
One end of one capacitor C1, the first resistor R1 connects IN signal end, and the other end of the first resistor R1 connects second resistance
The normal phase input end of one end of R2, one end of first capacitor C1 and first voltage follower A1, the first capacitor C1's is another
The other end of end and second resistance R2 are grounded, and ensure that the input voltage signal of detection stablizes nothing by the filter unit 111
Interference.
Rectification unit 112 described in this example includes 3rd resistor R3, the 4th resistance R4, the first operational amplifier A2, the
One diode D1, the second diode D2, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the second capacitor C2 and the second operation
One end of amplifier A3, the 3rd resistor R3 connected with one end of the 5th resistance R5 first voltage follower A1 output end and
The other end of the inverting input terminal of first voltage follower A1, the 3rd resistor R3 connects one end of the 4th resistance R4, first
The inverting input terminal of the cathode of diode D1 and the first operational amplifier A2；The output end of the first operational amplifier A2 and
The cathode of the second diode D2 of anode connection of one diode D1, the other end of the 4th resistance R4 and the second diode D2's
Anode passes through the inverting input terminal of the 6th resistance R6 connection second operational amplifier A3；The other end of the 5th resistance R5,
One end of two capacitor C2 connects the inverting input terminal of second operational amplifier A3, second capacitor with one end of the 7th resistance R7
The other end of C2, the 7th resistance R7 other end connect compensating unit 113 with the output end of second operational amplifier A3；Described first
The normal phase input end of operational amplifier A2 and the normal phase input end of second operational amplifier A3 are grounded.
Specifically, it also referring to Fig. 8, is taken absolute value by rectification unit 112 to low-impedance voltage signal.When low
When the voltage signal of impedance is positive value, the output end of the first operational amplifier A2 is negative, the second diode D2 conducting,
First diode D1 cut-off, so that the first operational amplifier A2 carries out reverse phase amplification to low-impedance voltage signal, Ui2=-
Ui*R4/R3=- Ui, Ui1=Ui, wherein second operational amplifier A3 is add circuit, can according to the empty short empty disconnected principle of amplifier
Ui1/R5+Ui2/R6=- Uo/R7 is obtained, above-mentioned given value is substituted into, obtains Uo=Ui；When low-impedance voltage signal Ui is negative value, institute
The output end for stating the first operational amplifier A2 is positive, the second diode D2 cut-off, the first diode D1 conducting, so that
Ui2=0V, Ui1=Ui, Ui1/R5+Ui2/R6=- Uo/R7 substitute into above-mentioned given value, obtain Uo=- Ui；It can be seen that second operational amplifier
The 14 foot Uo of output of A3=| Ui |.Wherein, Ui is the voltage value of A point, and Ui1 is the voltage value of B point, and Ui2 is the voltage value of C point, Uo
For the voltage value of D point.
Further, the compensating unit 113 includes third capacitor C3 and the 8th resistance R8, described one end third capacitor C3
Ground connection, one end of the 8th resistance R8 connect the positive input of second voltage follower A4 with the other end of 3rd resistor R3
The other end at end, the 8th resistance R8 connects rectification unit 112, is exported by the compensating unit 113 to rectification unit 112
Voltage signal carries out Integral Processing, and then guarantees to obtain accurate average field strength signal, and wherein U1 is obtained later to be integrated
The average field strength signal arrived, the i.e. voltage value of E point in Fig. 2.
Further, the amplifying unit 114 include the 9th resistance R9, the tenth resistance R10, eleventh resistor R11 and
Third operational amplifier A5, the output end and second voltage follower A4 of the 9th resistance R9 connection second voltage follower A4
Inverting input terminal, the 9th resistance R9 the other end connection third operational amplifier A5 normal phase input end；Described tenth
One end of resistance R10 connects the inverting input terminal of second operational amplifier A3, the tenth electricity with one end of eleventh resistor R11
The other end ground connection of R10 is hindered, the other end of the eleventh resistor R11 connects automatically with the output end of third operational amplifier A5
Control module 120 carries out high-precision enhanced processing to faint average field strength signal by amplifying unit 114, with full
The requirement of the subsequent conditioning circuit of foot, and then realize the permanent magnetic function of inversion electromagnetic field intelligent constant magnetic chip.Specifically, the amplification is single
The amplification principle of member 114 is as follows: according to the empty short empty disconnected principle of amplifier, (Vs-U2)/R11=U2/R10 obtains Vs=10U9, wherein
Vs is the voltage value for the average field strength signal that amplifying unit 114 exports, and U2 is the voltage value of F point.
Further, please continue to refer to Fig. 3 and Fig. 4, the low-pass filter unit 121 includes the first low-pass filter
1211, the second low-pass filter 1212 and third low-pass filter 1213, first low-pass filter 1211 and control chip
The 24th foot of U1 connects, and second low-pass filter 1212 is connect with the 25th foot of control chip U1, the third low pass filtered
Wave device 1213 is connect with the 30th foot of control chip U1 and the 31st foot；By first low-pass filter 1211 and the second low pass filtered
The default magnetic field intensity signal and average magnetic field intensity signal are carried out low-pass filtering treatment respectively by wave device 1212, so that input
It is stable, noiseless to the default magnetic field intensity signal of control chip U1 and average magnetic field intensity signal.By the third low pass filtered
Wave device 1213 is filtered the supply voltage for being input to control chip U1, provides more stable confession for control chip U1
Piezoelectric voltage, so that the analog-digital conversion process of control chip U1 is more accurate.
When it is implemented, first low-pass filter 1211 includes the 8th capacitor C8, the 9th capacitor C9 and the 24th
Resistance R24, one end of the 8th capacitor C8 and one end of the 24th resistance R24 are all connected with VSET signal end, and the described 8th
One end of the other end of capacitor C8 and the 9th capacitor C9 are grounded, the other end and the 24th resistance of the 9th capacitor C9
The 24th foot of the other end connection control chip U1 of R24.Second low-pass filter 1212 includes the tenth capacitor C10, the tenth
One capacitor C11 and the 25th resistance R25, one end of the tenth capacitor C10 and one end of the 25th resistance R25 are all connected with
VS signal end, the other end of the tenth capacitor C10 and one end of the 11st capacitor C11 are grounded, the 11st capacitor C11
The other end and the 25th resistance R25 the other end connection control chip U1 the 25th foot.The third low-pass filter
1213 include the 12nd capacitor C12, the 13rd capacitor C13, the 14th capacitor C14, the electricity of the 26th resistance R26 and the 27th
R27 is hindered, one end of the 12nd capacitor C12 connects DVDD signal end with one end of the 26th resistance R26, and the described 20th
The other end, one end of the 13rd capacitor C13 and one end of the 14th capacitor C14 of six resistance R26 is all connected with control chip U1's
The other end of 30th foot, one end of the 12nd resistance, the other end of the 13rd capacitor C13 and the 14th capacitor C14 connects
The 31st foot of control chip U1 is connect, the other end of the 12nd capacitor C12 and the other end of the 27th resistance R27 connect
Ground.
Further, Fig. 9, Figure 10, Figure 11 and Figure 12 are please referred to, the driving unit includes the first NOT gate chip B1, the
Two NOT gate chip B2, third NOT gate chip B3, the 4th NOT gate chip B4, the 28th resistance R28, the 20th resistance R20, third
One end of ten resistance R30 and the 31st resistance R31, the first NOT gate chip B1 and one end of the 28th resistance R28 connect
The 6th foot of control chip U1 is connect, the other end of the 28th resistance R28 connects DVDD signal end, the first NOT gate core
The other end of piece B1 connects GAH signal end；One end of the second NOT gate chip B2 is connected with one end of the 29th resistance R29
The 7th foot of chip U1 is controlled, the other end of the 29th resistance R29 connects DVDD signal end, second NOT gate chip
The other end of B2 connects GAL signal end；One end of the third NOT gate chip B3 connects control with one end of the 30th resistance R30
The other end of the 8th foot of chip U1, the 30th resistance R30 connects DVDD signal end, and the first NOT gate chip B1's is another
One end connects GBH signal end；One end of the 4th NOT gate chip B4 connects control chip with one end of the 31st resistance R31
The other end of the 9th foot of U1, the 31st resistance R31 connects DVDD signal end, and the 4th NOT gate chip B4's is another
End connection GBL signal end；By driving unit respectively to control chip U1 output driving signal GAH1, GAL1, GBH1, GBL1 into
Final driving signal GAH, GAL, GBH, GBL are exported to exciting current point adjustment module after row enhanced processing.Described first
NOT gate chip B1, the second NOT gate chip B2, third NOT gate chip B3 and the 4th NOT gate chip B4 model be 74HC14-SOP,
Certainly in other embodiments, other chips with the same function can also be used, this is not limited by the present invention.
Further, please continue to refer to Fig. 5, the burning unit 122 includes the 15th capacitor C15, the 32nd resistance
One end of R32 and socket XS, the 15th capacitor C15 connect DVDD signal end, the 15th electricity with the 4th foot of socket XS
Hold the 5th foot of the other end connection socket XS of C15, the 4th foot of the socket XS passes through the 32nd resistance R32 connection socket XS
The 3rd foot, the socket XS the 1st foot connection control chip U1 the 27th foot, the socket XS the 3rd foot connection control chip
The 13rd foot of U1, the 5th foot ground connection of the socket XS, the 6th foot of the socket XS connect the 26th foot.By external burning device (figure
In be not shown) connection socket XS establish with the connection relationship of burning unit 122, and then complete the downloading of corresponding software.Wherein institute
The model HEADER3X2 of socket XS is stated, certainly in other embodiments, other sockets with the same function can also be used,
This is not limited by the present invention.
Further, please continue to refer to Fig. 6, the voltage regulation unit 123 include voltage-stablizer U3, four-operational amplifier A6,
16th capacitor C16, the 33rd resistance R33, the 34th resistance R34, the 35th resistance R35, the 36th resistance
R36, the 37th resistance R37, the 1st foot of the voltage-stablizer U3 pass through the 33rd resistance R33 connection VCC signal end, institute
The one end, one end of the 34th resistance R34, one end of the 37th resistance R37 for stating the 16th capacitor C16 are all connected with voltage-stablizer
The 1st foot of U3, the other end ground connection of the 16th capacitor C16, the other end connection the 30th of the 34th resistance R34
The other end of one end of five resistance R35 and the 8th foot of voltage-stablizer U3, the 35th resistance R35 passes through the 36th resistance
R36 ground connection, the normal phase input end of the other end connection four-operational amplifier A6 of the 37th resistance R37, the described 4th
Operational amplifier A6 inverting input terminal connects the output end of four-operational amplifier A6, the output of the four-operational amplifier A6
The 29th foot of end connection control chip U1；Analog-to-digital conversion by voltage regulation unit 123 for the control chip U1 provides accurately
Reference voltage.Model TL431-SOP8, the model OP413 of the four-operational amplifier A6 of the voltage-stablizer U3, when
So in other embodiments, other controllers with the same function can also be used, this is not limited by the present invention.
Further, please continue to refer to Fig. 7, the oscillating unit 124 includes the 38th resistance R38, the 17th capacitor
C17, the 18th capacitor C18 and oscillator Y1, one end of the 17th capacitor C17 and one end of oscillator Y1 pass through the 30th
Eight resistance R38 connections control the 64th foot of chip U1, and the one of the other end of the 17th capacitor C17 and the 18th capacitor C18
End is grounded, and the other end of the 18th capacitor C18 connects the 63rd foot of control chip U1 with the other end of oscillator Y1, this
It can effectively ensure that the normal work of control chip U1 in embodiment using oscillating unit 124.
Specifically, 13 are please referred to, power amplifier inversion unit described in the present embodiment 132 includes twelfth resistor R12, the 13rd
Resistance R13, the 14th resistance R14, the 15th resistance R15, the 16th resistance R16, the 17th resistance R17, the 18th resistance
R18, the 19th resistance R19, the 20th resistance R20, the 21st resistance R21, the 22nd resistance R22, the 23rd resistance
R23, the 4th capacitor C4, the 5th capacitor C5, the 6th capacitor C6, the 7th capacitor C7, third diode D3, the 4th diode D4,
One zener diode ZD1, the second zener diode ZD2, third zener diode ZD3, the 4th zener diode ZD4, the first MOS
Pipe Q1, the second metal-oxide-semiconductor Q2, third metal-oxide-semiconductor Q3, the 4th metal-oxide-semiconductor Q4, the first isolation drive chip U11, the second isolation drive chip
U12, third isolation drive chip U13, the 1st foot of the 4th isolation drive chip U14, the first isolation drive chip U11 are logical
Cross twelfth resistor R12 connection GAH signal end, the 2nd foot ground connection of the first isolation drive chip U11, first isolation
The 3rd foot of driving chip U11, one end of the 14th resistance R14, the anode of the first zener diode ZD1, the first metal-oxide-semiconductor Q1
Source electrode connects the first signal output end and passes through the cathode of the 4th capacitor C4 connection third diode D3, first isolation drive
One end of the 4th foot connection thirteenth resistor R13 of chip U11；The other end, the 14th resistance R14 of the thirteenth resistor R13
The other end and the first zener diode ZD1 cathode connect the first metal-oxide-semiconductor Q1 grid, the first isolation drive chip
The cathode of the 5th foot connection third diode D3 of U11, the anode connection VCC signal end of the third diode D3, described first
The drain electrode of metal-oxide-semiconductor Q1 connects VDC signal end with the drain electrode of the second metal-oxide-semiconductor Q2.
The 1st foot of the second isolation drive chip U12 is by the 15th resistance R15 connection GAL signal end, and described second
The 2nd foot of isolation drive chip U12 and one end ground connection of the 6th capacitor C6, the 3rd foot of the second isolation drive chip U12,
One end of 17th resistance R17, the anode of the second zener diode ZD2, the second metal-oxide-semiconductor Q2 source grounding, described second
The 4th foot of isolation drive chip U12 connects one end of the 16th resistance R16, the other end of the 16th resistance R16, the tenth
The cathode of the other end of seven resistance R17 and the second zener diode ZD2 connect the grid of the second metal-oxide-semiconductor Q2, second metal-oxide-semiconductor
The drain electrode of the first metal-oxide-semiconductor Q1 of drain electrode connection of Q2, the 5th foot of the second isolation drive chip U12 connect the 6th capacitor C6's
The other end and VCC signal end.
The 1st foot of the third isolation drive chip U13 passes through the 18th resistance R18 connection GBH signal end, the third
The 2nd foot of isolation drive chip U13 is grounded, and the one of the 3rd foot of the third isolation drive chip U13, the 20th resistance R20
End, the anode of third zener diode ZD3, third metal-oxide-semiconductor Q3 source electrode connection second signal output end and pass through the 5th capacitor
The cathode of the 4th diode D4 of C5 connection, the 4th foot of the third isolation drive chip U13 connect the one of the 19th resistance R19
End；The cathode of the other end of the 19th resistance R19, the other end of the 20th resistance R20 and third zener diode ZD3 connects
The grid of third metal-oxide-semiconductor Q3 is connect, the 5th foot of the third isolation drive chip U13 connects the cathode of the 4th diode D4, described
The anode connection VCC signal end of 4th diode D4.
The 1st foot of the 4th isolation drive chip U14 is by the 21st resistance R21 connection GBL signal end, and described the
The 2nd foot of four isolation drive chip U14 and one end ground connection of the 7th capacitor C7, the 3rd of the 4th isolation drive chip U14 the
Foot, one end of the 23rd resistance R23, the anode of the 4th zener diode ZD4, the 4th metal-oxide-semiconductor Q4 source grounding, it is described
The 4th foot of 4th isolation drive chip U14 connects one end of the 22nd resistance R22, and the 22nd resistance R22's is another
The cathode at end, the other end of the 23rd resistance R23 and the 4th zener diode ZD4 connects the grid of the 4th metal-oxide-semiconductor Q4, described
The drain electrode of the drain electrode connection third metal-oxide-semiconductor Q3 of 4th metal-oxide-semiconductor Q4, the 5th foot connection the 7th of the 4th isolation drive chip U14
The other end of capacitor C7 and VCC signal end.
Further, the power amplifier inverter circuit uses H bridge shift theory, and specifically, upper bridge arm is by the first metal-oxide-semiconductor Q1
It is constituted with third metal-oxide-semiconductor Q3 and its peripheral part, lower bridge arm is by the second metal-oxide-semiconductor Q2 and the 4th metal-oxide-semiconductor Q4 and its peripheral part structure
At not altogether due to the first metal-oxide-semiconductor Q1 and the second metal-oxide-semiconductor Q2, third metal-oxide-semiconductor Q3 and the 4th metal-oxide-semiconductor Q4, it is therefore desirable to three
The driving power supply of road isolation simplifies circuit to reduce power supply quantity, and the power amplifier inverter circuit in the application uses
Charge pump principle generates driving power required for upper bridge arm the first metal-oxide-semiconductor Q1 and third metal-oxide-semiconductor Q3.Three or two pole
Pipe D3, the 4th capacitor C4 constitute the charge pump of the first metal-oxide-semiconductor Q1 driving power supply, wherein third metal-oxide-semiconductor Q3 and the second metal-oxide-semiconductor
Q2 is worked alternatively, and when the second metal-oxide-semiconductor Q2 conducting, VCC signal end is charged by third diode D3 to the 4th capacitor C4, by
4th capacitor C4 stores the voltage that VCC signal end provides；When the second metal-oxide-semiconductor Q2 shutdown, the 4th capacitor C4 and the first MOS source electrode
One end of connection is the source electrode of the first metal-oxide-semiconductor Q1, since the voltage of the 4th capacitor C4 cannot be mutated, so relative to first
The source electrode of MOS, the voltage on the 4th capacitor C4 is still constant, can give the second metal-oxide-semiconductor Q2 driving end power supply, the as work of charge pump
Make principle.Similarly the 4th metal-oxide-semiconductor Q4 and the 5th capacitor C5 constitute the charge pump of third metal-oxide-semiconductor Q3.Therefore single power supply electricity
Source can complete to power to entire H electrical bridge by charge pump.
Specifically, please continue to refer to Figure 13, the working principle of the power amplifier inverter circuit is as follows: when driving signal GAH is
When high level, the first isolation drive core is connected by twelfth resistor R12 in driving signal GAH, and then the first isolation drive
The 4th foot of chip U11 becomes high level, is further advanced by thirteenth resistor R13 and drives the first metal-oxide-semiconductor Q1 conducting.Wherein, institute
The 14th resistance R14 and the first zener diode ZD1 is stated then to be used to protect the grid of the first metal-oxide-semiconductor Q1.When driving is believed
When number GAH is low level, the 4th foot of the first isolation drive chip U11 becomes low level, so that the first metal-oxide-semiconductor Q1 ends.
When driving signal GAL is high level, driving signal GAL makes the second isolation drive by the 15th resistance R15
Chip U12 conducting, and then the 4th foot of the second isolation drive chip U12 becomes high level, is further advanced by the 16th resistance
R16 drives the second metal-oxide-semiconductor Q2 conducting.Wherein, the 17th resistance R17 and the second zener diode ZD2 are then used for second
The grid of metal-oxide-semiconductor Q2 is protected.When driving signal GAL is low level, the 4th foot of the second isolation drive chip U12
Then become low level, so that the second metal-oxide-semiconductor Q2 ends.Preferably, the 6th capacitor C6 is then used to remove power supply
Coupling and filtering.
When driving signal GBH is high level, driving signal GBH makes third isolation drive by the 18th resistance R18
Core conducting, and then the 4th foot of third isolation drive chip U13 becomes high level, is further advanced by the 19th resistance R19 driving
Third metal-oxide-semiconductor Q3 conducting.Wherein, the 20th resistance R20 and third zener diode ZD3 are then used for third metal-oxide-semiconductor Q3
Grid protected.When driving signal GBH is low level, the 4th foot of third isolation drive chip U13 becomes low level,
So that third metal-oxide-semiconductor Q3 ends.
When driving signal GBL is high level, driving signal GBL drives the 4th isolation by the 21st resistance R21
Dynamic chip U14 conducting, and then the 4th foot of the 4th isolation drive chip U14 becomes high level, is further advanced by the 22nd electricity
It hinders R22 and drives the 4th metal-oxide-semiconductor Q4 conducting.Wherein, the 23rd resistance R23 and the 4th zener diode ZD4 is then used for pair
The grid of 4th metal-oxide-semiconductor Q4 is protected.When driving signal GBL is low level, the of the 4th isolation drive chip U14
4 feet then become low level, so that the 4th metal-oxide-semiconductor Q4 ends.Preferably, the 7th capacitor C7 is then used to carry out power supply
Decoupling and filtering.
Further, also referring to Figure 14, specifically, when the power amplifier inverter circuit enters working condition, preceding
Half of T period, driving signal GBH and driving signal GAL end simultaneously, and driving signal GAH and driving signal GBL are simultaneously turned on,
Turn-on time TD, the first output end OUT1 and second output terminal OUT2 export positive square wave；In rear half of T period, driving signal
GAH and driving signal GBL end simultaneously, and driving signal GBH and driving signal GAL are simultaneously turned on, turn-on time TD, the first output
OUT1 and second output terminal OUT2 is held to export losing side wave.Therefore the control and output for completing a cycle, move in circles, and export
Continual pulsewidth is the square wave alternating-current electricity for the TD period being T；Wherein, driving signal GAH, the driving letter provided by control chip U1
Number GAL, driving signal GBH, driving signal GBL be pulsewidth be the TD period be T signal, and counted by control chip U1 according to PID
The size of result control pulsewidth is calculated, output electromagnetic field intensity is controlled to realize, keeps electromagnetic field intensity constant.
The voltage signal that external magnetic inductor 170 inputs is detected by the Magnetic testi module 110 in the present invention, and by voltage
Signal, which is filtered, takes absolute value, being averaged, amplifying etc. after processing, exports average field strength signal to automatically controlling mould
Block 120 carries out the average field strength signal by the automatic control module 120 to obtain average magnetic strength after analog-to-digital conversion
The digital quantity value of degree, while analog-to-digital conversion is carried out to default magnetic field intensity signal and obtains its digital quantity value, and then by control chip
U1 carries out digital PID calculating according to the digital quantity value of average magnetic intensity and the digital quantity value of default magnetic field intensity signal, then by controlling
Coremaking piece U1 controls driving signal GAH, driving signal GAL, driving signal GBH and driving signal GBL according to PID calculated result
Pulsewidth size controls output electromagnetic field intensity to realize, keeps electromagnetic field intensity constant.
The pid algorithm, wherein P is ratio, and I is integral, and D is differential, i.e., by carrying out to input/output argument deviation
Ratio, integral and differential calculation are estimated the deviation trend of subsequent time, are adjusted in time, make every effort to output dynamic close to setting
Value.
Specifically, the formula of the pid algorithm is as follows:
(1)
Wherein, Kp is proportional gain, and TI is integration time constant, and TD is derivative time constant, and u (t) is control amount, and e (t) is quilt
Deviation between control amount and given value, e (t)=Es-Eo (t), wherein Eo (t) is the digital quantity value of average magnetic intensity, and Es is pre-
If the digital quantity value of magnetic field intensity signal.
In order to carry out Digital PID Algorithm, (1) formula discretization is obtained
(2)
Wherein
T among the above is the sampling period, and k is sample sequence number.
In order to program conveniently, (2) formula is further arranged, is obtained
(3)
Wherein
。
Specifically, Figure 15 is please referred to, the pid number regulating step of the inversion electromagnetic field intelligent constant magnetic chip is as follows:
After S1, system electrification, Initialize installation is carried out, and carry out sampling timing setting；
S2, judge whether to the sampling time, if so, step S3 is carried out, if it is not, then carrying out step S7；
S3, analog-to-digital conversion is carried out to average field strength signal；
S4, analog-to-digital conversion is carried out to default magnetic field intensity signal；
S5, PID calculating is carried out according to the formula (3) in above-mentioned pid algorithm；
S6, the pulsewidth size that driving signal is adjusted according to calculated result；
S7, other things are handled.
The present invention correspondingly provides a kind of permanent magnetic flaw detector, please refers to Figure 16, the perseverance magnetic flaw detector includes power module
150, encouraging to inversion electromagnetic field intelligent constant magnetic chip is exported for default magnetic field intensity signal to be converted into voltage signal form
Magnetically condition conversion module 160, magnetic inductor 170, electromagnetic coil (not shown) and iron core 180 further include as described above
Inversion electromagnetic field intelligent constant magnetic chip, the power module 150 are connect with adjustment of field excitation conversion module 160, the adjustment of field excitation
Conversion module 160 is connect with the automatic control module 120 in inversion electromagnetic field intelligent constant magnetic chip, the power module 150 with
Energy supply control module 140 in inversion electromagnetic field intelligent constant magnetic chip connects, the magnetic inductor 170 and inversion electromagnetic field intelligence
Exciting current adjustment module 130 in permanent magnetic chip connects.
Specifically, power supply is provided for entire permanent magnetic flaw detector by the power module 150, it is preferable that the power module
150 be Rechargeable battery；Magnetic field strength is set as needed by the adjustment of field excitation conversion module 160, and by magnetic field strength
Setting value is converted to voltage signal and exports to inversion electromagnetic field intelligent constant magnetic chip, so that inversion electromagnetic field intelligent constant magnetic chip obtains
It is stable, accurately preset magnetic field intensity signal；It is defeated that magnetic field intensity signal is converted into voltage signal by the magnetic inductor 170
It is handled and is converted to inversion electromagnetic field intelligent constant magnetic chip out；Inversion electromagnetic field intelligent constant magnetic is received by the electromagnetic coil
The square wave alternating-current electricity of chip output generates electromagnetic field；Further, the electromagnetic field that electromagnetic coil generates is transmitted to by iron core 180
On measured workpiece, to realize flaw detection function.It is detailed due to having been carried out to the inversion electromagnetic field intelligent constant magnetic chip above
Description, details are not described herein again.Perseverance magnetic flaw detector of the present invention is by utilizing inversion electromagnetic field intelligent constant magnetic chip real-time control
The size of solenoid current, to obtain the constant magnetic field strength for passing through iron core 180, i.e., so that the magnetic of permanent magnetic flaw detector output
Format of field is constant, can export constant magnetic field strength under any circumstance, and then guarantee the consistent of the sensitivity that instrument detects,
Guarantee objective unified inspection result, provides the foundation of science for the safe operation of product and instruction analysis.
In conclusion a kind of inversion electromagnetic field intelligent constant magnetic chip provided by the invention and permanent magnetic flaw detector, the inversion
Electromagnetic field intelligent constant magnetic chip includes Magnetic testi module, automatic control module and exciting current adjustment module, by the Magnetic testi
Module detects the voltage signal of external magnetic inductor input, and exports average field strength signal to certainly according to the voltage signal
Dynamic control module is adjusted by the automatic control module according to the average field strength signal and default magnetic field intensity signal
The duty ratio size of driving signal simultaneously outputs this to exciting current adjustment module, will be inputted by the exciting current adjustment module
DC inverter at alternating current, and according to driving signal adjust alternating current duty ratio size after output this to electromagnetic coil,
So that generating constant magnetic field strength by the electromagnetic coil that alternating current controls, and then guarantee that the sensitivity of instrument detection is consistent.
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 all should belong to the guarantor of appended claims of the invention
Protect range.
Claims (10)
1. a kind of inversion electromagnetic field intelligent constant magnetic chip, which is characterized in that including Magnetic testi module, automatic control module and excitation
Current regulating module, the voltage signal of external magnetic inductor input is detected by the Magnetic testi module, and is believed according to the voltage
Number output average field strength signal to automatic control module, believed by the automatic control module according to the average field strength
Number and default magnetic field intensity signal adjustment driving signal duty ratio size and output this to exciting current adjustment module, by
Input dc power is reverse into alternating current by the exciting current adjustment module, and the duty ratio of alternating current is adjusted according to driving signal
Electromagnetic coil is output this to after size, so that generating constant magnetic field strength by the electromagnetic coil that alternating current controls.
2. inversion electromagnetic field intelligent constant magnetic chip according to claim 1, which is characterized in that the Magnetic testi module includes
Filter unit, first voltage follower, second voltage follower, rectification unit, compensating unit and amplifying unit, by filter unit
Output is to first voltage follower after the voltage signal that will test is filtered, by first voltage follower by voltage signal
Output is to rectification unit after carrying out voltage follow, and output is single to compensating after voltage signal is carried out rectification processing by rectification unit
Member, output average field strength signal is to the second follower after voltage signal is carried out Integral Processing by compensating unit, by second
Follower will average field strength signal carry out voltage follow after output to amplifying unit, by amplifying unit by average field strength
Signal exports after amplifying processing to automatic control module.
3. inversion electromagnetic field intelligent constant magnetic chip according to claim 1, which is characterized in that the automatic control module packet
Control chip, low-pass filter unit and driving unit are included, by the average field strength signal and is preset by low-pass filter unit
Output is to control chip after magnetic field intensity signal is filtered, by control chip to average field strength signal and default magnetic
Field intensity signal adjusts the duty ratio size of driving signal after carrying out analog-to-digital conversion and PID calculating, and it is single to output this to driving
Member exports after driving signal is amplified processing by driving unit to exciting current adjustment module.
4. inversion electromagnetic field intelligent constant magnetic chip according to claim 1, which is characterized in that the exciting current adjustment mould
Block includes current limliting filter unit, power amplifier inversion unit and protection location, is filtered by current limliting filter unit to input dc power
Output is to power amplifier inversion unit after processing, and the input dc power is reverse into alternating current by power amplifier inversion unit, and according to
Protection location is output this to after the duty ratio size of driving signal adjustment alternating current, stable exchange is exported by protection location
Electricity.
5. inversion electromagnetic field intelligent constant magnetic chip according to claim 2, which is characterized in that the filter unit includes the
One end of one resistance, second resistance and first capacitor, the first resistor connects IN signal end, the other end of the first resistor
One end, one end of first capacitor and the normal phase input end of first voltage follower of second resistance are connected, the first capacitor
The other end and the other end of second resistance are grounded.
6. inversion electromagnetic field intelligent constant magnetic chip according to claim 2, which is characterized in that the rectification unit includes the
Three resistance, the 4th resistance, the first operational amplifier, first diode, the second diode, the 5th resistance, the 6th resistance, the 7th electricity
Resistance, the second capacitor and second operational amplifier, one end of the 3rd resistor connected with one end of the 5th resistance first voltage with
With the output end of device and the inverting input terminal of first voltage follower, the other end of the 3rd resistor connects the one of the 4th resistance
It holds, the inverting input terminal of the cathode of first diode and the first operational amplifier；The output end of first operational amplifier and
The cathode of anode the second diode of connection of first diode, the other end of the 4th resistance and the anode of the second diode are logical
Cross the inverting input terminal of the 6th resistance connection second operational amplifier；One end of the other end of 5th resistance, the second capacitor
The inverting input terminal of second operational amplifier, the other end, the 7th resistance of second capacitor are connected with one end of the 7th resistance
The other end connects compensating unit with the output end of second operational amplifier；The normal phase input end of first operational amplifier and
The normal phase input end of two operational amplifiers is grounded.
7. inversion electromagnetic field intelligent constant magnetic chip according to claim 2, which is characterized in that the compensating unit includes the
Three capacitors and the 8th resistance, third capacitor one end ground connection, one end of the 8th resistance and the other end of 3rd resistor connect
The normal phase input end of second voltage follower is connect, the other end of the 8th resistance connects rectification unit.
8. inversion electromagnetic field intelligent constant magnetic chip according to claim 2, which is characterized in that the amplifying unit includes the
Nine resistance, the tenth resistance, eleventh resistor and third operational amplifier, the 9th resistance connect the defeated of second voltage follower
The inverting input terminal of outlet and second voltage follower, the positive of the other end connection third operational amplifier of the 9th resistance
Input terminal；One end of tenth resistance connects the inverting input terminal of second operational amplifier, institute with one end of eleventh resistor
The other end ground connection of the tenth resistance is stated, the other end of the eleventh resistor connects automatically with the output end of third operational amplifier
Control module.
9. inversion electromagnetic field intelligent constant magnetic chip according to claim 4, which is characterized in that the power amplifier inversion unit packet
Include twelfth resistor, thirteenth resistor, the 14th resistance, the 15th resistance, the 16th resistance, the 17th resistance, the 18th electricity
Resistance, the 19th resistance, the 20th resistance, the 21st resistance, the 22nd resistance, the 23rd resistance, the 4th capacitor, the 5th
Capacitor, the 6th capacitor, the 7th capacitor, third diode, the 4th diode, the first zener diode, the second zener diode,
Three zener diodes, the 4th zener diode, the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, third metal-oxide-semiconductor, the 4th metal-oxide-semiconductor, the first isolation
Driving chip, the second isolation drive chip, third isolation drive chip, the 4th isolation drive chip, first isolation drive
1st foot of chip connects GAH signal end by twelfth resistor, the 2nd foot ground connection of the first isolation drive chip, and described the
3rd foot of one isolation drive chip, one end of the 14th resistance, the anode of the first zener diode, the first metal-oxide-semiconductor source electrode connect
It connects the first signal output end and passes through the cathode of the 4th capacitance connection third diode, the 4th of the first isolation drive chip the
One end of foot connection thirteenth resistor；The other end of the thirteenth resistor, the other end of the 14th resistance and the first pressure stabilizing
The cathode of diode connects the grid of the first metal-oxide-semiconductor, and the 5th foot connection third diode of the first isolation drive chip is born
Pole, the anode connection VCC signal end of the third diode, the drain electrode of first metal-oxide-semiconductor are connected with the drain electrode of the second metal-oxide-semiconductor
VDC signal end；
1st foot of the second isolation drive chip connects GAL signal end, the second isolation drive core by the 15th resistance
One end of 2nd foot of piece and the 6th capacitor ground connection, the 3rd foot of the second isolation drive chip, one end of the 17th resistance, the
The source grounding of the anode of two zener diodes, the second metal-oxide-semiconductor, the 4th foot connection the tenth of the second isolation drive chip
One end of six resistance, the other end, the other end of the 17th resistance and the cathode of the second zener diode of the 16th resistance
Connect the grid of the second metal-oxide-semiconductor, the drain electrode of drain electrode the first metal-oxide-semiconductor of connection of second metal-oxide-semiconductor, the second isolation drive core
5th foot of piece connects the other end and the VCC signal end of the 6th capacitor；
1st foot of the third isolation drive chip connects GBH signal end, the third isolation drive core by the 18th resistance
2nd foot of piece is grounded, and the 3rd foot of the third isolation drive chip, one end of the 20th resistance, third zener diode are just
Pole, the source electrode connection second signal output end of third metal-oxide-semiconductor and by the cathode of the 4th diode of the 5th capacitance connection, described the
4th foot of three isolation drive chips connects one end of the 19th resistance；The other end of 19th resistance, the 20th resistance
The other end connects the grid of third metal-oxide-semiconductor with the cathode of third zener diode, and the 5th foot of the third isolation drive chip connects
Connect the cathode of the 4th diode, the anode connection VCC signal end of the 4th diode；
1st foot of the 4th isolation drive chip connects GBL signal end, the 4th isolation drive by the 21st resistance
One end of 2nd foot of chip and the 7th capacitor ground connection, the one of the 3rd foot of the 4th isolation drive chip, the 23rd resistance
End, the anode of the 4th zener diode, the 4th metal-oxide-semiconductor source grounding, the 4th isolation drive chip the 4th foot connection
One end of 22nd resistance, the other end of the 22nd resistance, the other end of the 23rd resistance and the 4th pressure stabilizing two
The cathode of pole pipe connects the grid of the 4th metal-oxide-semiconductor, and draining for the 4th metal-oxide-semiconductor connects the drain electrode of third metal-oxide-semiconductor, and the described 4th
5th foot of isolation drive chip connects the other end and the VCC signal end of the 7th capacitor.
10. a kind of perseverance magnetic flaw detector, which is characterized in that including power module, for default magnetic field intensity signal to be converted into electricity
Pressure signal form export the adjustment of field excitation conversion module to inversion electromagnetic field intelligent constant magnetic chip, magnetic inductor, electromagnetic coil and
Iron core further includes inversion electromagnetic field intelligent constant magnetic chip as described in any one of claims 1-9.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112034031A (en) * | 2020-07-15 | 2020-12-04 | 成都飞机工业（集团）有限责任公司 | Magnetic Barkhausen noise signal detection and adjustment system and adjustment method thereof |
| CN115326921A (en) * | 2022-10-14 | 2022-11-11 | 中国石油大学(华东) | Double-frequency single-phase-locking double-mode detection device and detection method based on double-layer coil |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2530816A1 (en) * | 1975-07-10 | 1977-01-27 | Foerster Inst Dr Friedrich | Flaw detector for testing materials esp. tubes - has magnetic head with alternating field and tracking error compensation |
| JPH05340923A (en) * | 1992-06-04 | 1993-12-24 | Hitachi Metals Ltd | Magnetic detector |
| CN202974946U (en) * | 2012-10-26 | 2013-06-05 | 中国北车集团大同电力机车有限责任公司 | Magnetic particle flaw detector |
| CN104090146A (en) * | 2014-07-24 | 2014-10-08 | 中国科学院上海应用物理研究所 | Alternating current/direct current sensor |
| CN204228925U (en) * | 2014-10-31 | 2015-03-25 | 海航航空技术有限公司 | Alternating-current generator of airplane pressure regulator |
| CN104796002A (en) * | 2015-04-28 | 2015-07-22 | 深圳市神视检验有限公司 | Power processing circuit of AC/DC magnetic defect detector and magnetic defect detector |
| US20160161570A1 (en) * | 2013-07-18 | 2016-06-09 | Fujikura Ltd. | Magnetic sensor drive circuit, magnetic sensor, current sensor, and method for driving magnetic sensor |
| CN108233653A (en) * | 2018-02-08 | 2018-06-29 | 广东叠加能源科技有限责任公司 | The micro- source electricity generation system of magnetic energy quantum superposition vector |
| CN208383791U (en) * | 2018-07-11 | 2019-01-15 | 深圳市中昌探伤器材有限公司 | A kind of inversion electromagnetic field intelligent constant magnetic chip and permanent magnetic flaw detector |
-
2018
- 2018-07-11 CN CN201810757439.7A patent/CN109030618B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2530816A1 (en) * | 1975-07-10 | 1977-01-27 | Foerster Inst Dr Friedrich | Flaw detector for testing materials esp. tubes - has magnetic head with alternating field and tracking error compensation |
| JPH05340923A (en) * | 1992-06-04 | 1993-12-24 | Hitachi Metals Ltd | Magnetic detector |
| CN202974946U (en) * | 2012-10-26 | 2013-06-05 | 中国北车集团大同电力机车有限责任公司 | Magnetic particle flaw detector |
| US20160161570A1 (en) * | 2013-07-18 | 2016-06-09 | Fujikura Ltd. | Magnetic sensor drive circuit, magnetic sensor, current sensor, and method for driving magnetic sensor |
| CN104090146A (en) * | 2014-07-24 | 2014-10-08 | 中国科学院上海应用物理研究所 | Alternating current/direct current sensor |
| CN204228925U (en) * | 2014-10-31 | 2015-03-25 | 海航航空技术有限公司 | Alternating-current generator of airplane pressure regulator |
| CN104796002A (en) * | 2015-04-28 | 2015-07-22 | 深圳市神视检验有限公司 | Power processing circuit of AC/DC magnetic defect detector and magnetic defect detector |
| CN108233653A (en) * | 2018-02-08 | 2018-06-29 | 广东叠加能源科技有限责任公司 | The micro- source electricity generation system of magnetic energy quantum superposition vector |
| CN208383791U (en) * | 2018-07-11 | 2019-01-15 | 深圳市中昌探伤器材有限公司 | A kind of inversion electromagnetic field intelligent constant magnetic chip and permanent magnetic flaw detector |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112034031A (en) * | 2020-07-15 | 2020-12-04 | 成都飞机工业（集团）有限责任公司 | Magnetic Barkhausen noise signal detection and adjustment system and adjustment method thereof |
| CN112034031B (en) * | 2020-07-15 | 2021-08-03 | 成都飞机工业（集团）有限责任公司 | Magnetic Barkhausen noise signal detection and adjustment system and adjustment method thereof |
| CN115326921A (en) * | 2022-10-14 | 2022-11-11 | 中国石油大学(华东) | Double-frequency single-phase-locking double-mode detection device and detection method based on double-layer coil |
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|---|---|
| CN109030618B (en) | 2024-03-08 |
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