CN104266578B - Ferromagnetic type coating thickness detector circuit based on mobile display terminal - Google Patents
Ferromagnetic type coating thickness detector circuit based on mobile display terminal Download PDFInfo
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Abstract
The invention provides a kind of ferromagnetic type coating thickness detector circuit based on mobile display terminal, including F types coating probe, audio jack, 3 core cables, data acquisition and code modulated circuits module, the module includes data processing circuit, described data processing circuit includes U5 microcontrollers, No. 5 wiring pins of wherein described U5 microcontrollers are PTA3/EXTAL0 ends, No. 6 wiring pins are PTA4/LLWU_P0/XTAL0 ends, it is connected between No. 5 wiring pins and No. 6 wiring pins by resistance R5, and crystal oscillator X2 is parallel with resistance R5, crystal oscillator X2 both sides are grounded by electric capacity C31 and electric capacity C32 respectively.The present invention, which has, improves mobile terminal service efficiency, lowering apparatus cost, is 4 one-tenth of common detector cost, and it is more accurate to measure, measurement accuracy is high, detection error is contracted to ± 1% from ± 3%, and automaticity is higher, solves the problems, such as the networking of instrument, data backup problem, small volume, long lifespan is configured with the advantage of 2.5 times of the detector life-span upgrading of the circuit.
Description
Technical field
The present invention relates to technical field of electric appliances, more particularly to a kind of ferromagnetic type coating thickness detector based on mobile display terminal
Circuit.
Background technology
Traditional coating thickness detector constitutes coating thickness measuring device in the form of main frame adds coating to pop one's head in, as a kind of special
Industry instrument, this pattern has continued to use decades.But this traditional coating thickness detector has the disadvantage that：
1. display content is not enough enriched, low resolution is used current coating thickness detector more（Typically 128*64）FSTN liquid
Fisheye battle array.Although some menus and measurement result can be shown, if to carry out caulocarpic comparative analysis, it can only borrow
PC software is helped to complete on computers, this has resulted in very big inconvenience.
2. complicated temperature compensation algorithm relatively difficult to achieve.Because coating probe is substantially by coil as main sensitivity
Part, due to there is distributed resistance, and causes coating probe to be influenced by temperature larger, especially influence of the hand temperature to probe
Usually influence measurement result arrives stage unacceptably, and does temperature-compensating using traditional monolithic, from arithmetic speed with
All it is to compare laboriously for computing depth.
3. data-handling capacity is limited.Conventional coatings calibrator is only capable of completing simple measurement function and display function,
And comparison analysis, data statistics, the data mining to mass data are helpless.
4. conventional coatings calibrator major part cost is spent on main frame, especially the non-measured circuit part of main frame.
The cost of measuring circuit is only accounted for less than 1/8, that is to say, that most of cost be fall it and be bad at display, at data
Above reason, data transfer and other miscellaneous functions.
The content of the invention
The technical problem to be solved in the present invention is that the weak point present in prior art is based on movement there is provided one kind
The ferromagnetic type coating thickness detector circuit of display terminal, utilizes the mobile terminals such as mobile phone powerful data-handling capacity and display function
Realize the data processing and data mining of mass data, it is possible to have attractive in appearance, convenient display function, make full use of mobile terminal
Generality, improve mobile terminal service efficiency, lowering apparatus cost is 4 one-tenth of common detector cost, using this mould
Formula, single-chip microcomputer can be except data acquisition and data encoding almost no other tasks, therefore its measuring speed and precision are all
It is that traditional coating thickness measuring circuit is incomparable, so that measurement is more accurate, measurement accuracy is high, by current the sector
The detection error for being difficult to capture is contracted to ± 1% from ± 3%, and automaticity is higher, solves the problems, such as the networking of instrument, number
According to backup problem, small volume, long lifespan, due to the low factor of power consumption, is configured with the detector life-span upgrading 2.5 of the circuit
Times.
The technical solution of the present invention is to provide a kind of following ferromagnetic type coating thickness detector based on mobile display terminal
Circuit, including F types coating probe, audio jack, 3 core cables, data acquisition and code modulated circuits module, the data acquisition
And code modulated circuits module includes data processing circuit.
Preferably, described data processing circuit includes model MKL05Z32VFK4 U5 microcontrollers, the U5
Microcontroller includes 1 ~ No. 24, amounts to 24 wiring pins, wherein No. 5 wiring pins of the U5 microcontrollers are PTA3/EXTAL0
End, No. 6 wiring pins are PTA4/LLWU_P0/XTAL0 ends, are connected between No. 5 wiring pins and No. 6 wiring pins by resistance R5,
And crystal oscillator X2 is parallel with resistance R5, crystal oscillator X2 both sides are grounded by electric capacity C31 and electric capacity C32 respectively.
Preferably, No. 3 wiring pins of the U5 microcontrollers are VDD VREFH ends, No. 3 wiring pins are connected to Vin ends, 3
Number wiring pin is further connected with electric capacity C25, electric capacity C25 other end ground connection.
Preferably, No. 17 wiring pins of the U5 microcontrollers are PTB3/IRQ_14 ends, STK_TX ends, STK_ are connected to
Parallel connection after resistance R11, resistance R11 is connected to behind TX ends it is connected to after electric capacity C8 and electric capacity C9, electric capacity C9 and be grounded, is connected to electricity after electric capacity C8
Hinder and be grounded after R12, resistance R12, MIC ends are further connected between electric capacity C8 and resistance R12.
Preferably, No. 18 wiring pins of the U5 microcontrollers are PTB4/IRQ_15/LLWU_P6 ends, STK_RX is connected to
It is connected to behind end after electric capacity C5, electric capacity C5 and is connected to LEFT ends, Vin ends is connected to after resistance R9, resistance R9 are further connected with behind STK_RX ends,
It is further connected with after resistance R10, resistance R10 and is grounded behind STK_RX ends.
Preferably, No. 23 wiring pins of the U5 microcontrollers are PTA1/IRQ_1/RESET_b ends, No. 23 wiring pins
It is followed by behind nRESET ends, nRESET ends being connected to after resistance R51, resistance R51 and is connected to Vin ends, nRESET is further connected with electric capacity behind end
It is grounded after C41, electric capacity C41, is further connected with electric capacity C6 behind nRESET ends, electric capacity C6 is followed by RIGHT ends.
Preferably, No. 16 wiring pins of the U5 microcontrollers are PTA9 ends, POWER_EN ends, POWER_EN ends are connected to
After be connected to power supply circuit, the power supply circuit is to be connected to electric capacity C21, electric capacity after the resistance R7 that POWER_EN ends are followed by, resistance R7
It is grounded after C21, electric capacity C3 is connected to after resistance R7, electric capacity C3 is polarized electric capacity, and positive pole side is connected with resistance R7, electric capacity
It is grounded after C3, is further connected with after resistance R7 after resistance R24, resistance R24 and is connected to resistance R23, be grounded after resistance R23, after resistance R7 also
Inductance L1 is connected to after being connected to diode D20, diode D20；
Preferably, also include model TPS61040DBV U4 controllers, SW ends and the diode D20 of U4 controllers
Positive terminal be connected, the GND ends of U4 controllers ground connection is connected with the FB ends of U4 controllers after resistance R24, after inductance L1 with
The Vin ends of U4 controllers are connected, the En termination SHUTDOWN ends of U4 controllers, and electric capacity C30, electric capacity are further connected with after inductance L1
C30 is polarized electric capacity, and positive pole side is connected with inductance L1, is grounded after electric capacity C30, and button cell is further connected with after inductance L1
P3；
Preferably, model SI2323DS FET is further connected with behind POWER_EN ends, the G terminations of FET
POWER_EN ends, the D termination+5V_F power supplys of FET, the S terminations of FET are connected with diode D20 negative pole end,
The D ends of FET are further connected with after diode VQ5, diode VQ5 to be connected with the S ends of FET, is further connected with after resistance R7
TP1 ends.
Preferably, No. 1 wiring pin of the U5 microcontrollers is PTB6/IRQ_2 ends, No. 1 wiring pin connects F1 ends, FI ends
Measuring circuit is connected to, the measuring circuit is that No. 1 wiring pin that PF1 is provided with three wiring pins, PF1 is connected to+2V_F power supplys,
It is connected to after+2V_F power supplys after resistance R40, resistance R40 and is connected to resistance R47, operational amplifier U2C, and resistance is connected to after resistance R40
R40 is connected with operational amplifier U2C reverse input end, and the output end after resistance R47 with operational amplifier U2C is connected,
No. 2 wiring pins being parallel with resistance R47 on electric capacity C4, PF1 are connected with operational amplifier U2C input in the same direction, on PF1
No. 1 wiring pin be connected with No. 2 wiring pins on PF1 by resistance R13；
Preferably, operational amplifier U2C output is terminated with after resistance R41, resistance R41 being connected to electric capacity C7, electric capacity C7
After be connected to operational amplifier U2D, operational amplifier U2D input in the same direction is connected with electric capacity C7, operational amplifier it is reverse
Input is terminated with+2V_F ends, and operational amplifier U2D output is terminated with after resistance R49, resistance R49 with operational amplifier U2D's
Input in the same direction is connected；
Preferably, operational amplifier U2D output is connected to resistance R37, resistance after being terminated with resistance R42, resistance R42
Operational amplifier U2B is connected to after R37, operational amplifier U2B reverse input end is connected with resistance R37, operational amplifier U2B
Input in the same direction be terminated with+2V_F ends, operational amplifier U2B output end passes through resistance R14 and No. 3 wiring pin phases on PF1
Connection, operational amplifier U2B reverse input end is further connected with the output end after electric capacity C45, electric capacity C45 with operational amplifier U2B
It is connected；
Preferably, output end phase of the operational amplifier U2D input in the same direction by resistance R8 and operational amplifier U2B
Connection, operational amplifier U2D output end is further connected with model 74LVC1G14DBVR IC chip, the NC ends of the IC chip
Vacant, 1A ends are connected with operational amplifier U2D output end, GND ends ground connection, Vcc termination Vin ends, and 1Y termination FI ends are described
Vin ends are connected with R51.
Preferably, also include amplification treatment circuit, the amplification treatment circuit be+2V_F ends after be connected to operational amplifier
U2A, operational amplifier U2A reverse input end are connected with+2V_F ends, and operational amplifier U2A reverse input end passes through electricity
Resistance R15 is connected with operational amplifier U2A output end, and operational amplifier U2A input in the same direction is terminated with resistance R18, resistance
It is grounded after R18, operational amplifier U2A input in the same direction is connected to electric capacity C10, electric capacity after being further connected with resistance R16, resistance R16
C10 is polarized electric capacity, and electric capacity C10 positive pole is connected with resistance R16, resistance R17 is connected to after resistance R16, resistance R17 is followed by
Have and be grounded after electric capacity C18, electric capacity C18 ,+5V_F ends are connected to after resistance R17, model is provided between+5V_F ends and earth terminal
TLC27M9ID IC chip.
Preferably, No. 2 wiring pins of the U5 microcontrollers are PTB7/IRQ_3 ends, and No. 2 wiring pins are vacant；No. 4
Wiring pin is VREFL VSS ends, No. 4 wiring pin ground connection；No. 7 wiring pins are PTA5/LLWU_P1/RTC_CLKIN ends, and No. 7 connect
Stitch is vacant；No. 8 wiring pins are PTA6/LLWU_P2 ends, and No. 8 wiring pins are vacant；No. 9 wiring pins are PTB10 ends, and No. 9 connect
Stitch is vacant；No. 10 wiring pins are PTB11 ends, and No. 10 wiring pins are vacant；No. 11 wiring pins are PTA7/IRQ_7/LLWU_P3
End, and No. 11 wiring pins are vacant；No. 12 wiring pins are PTB0/IRQ_8/LLWU_P4 ends, and No. 12 wiring pins connect SHUTDOWN ends；
No. 13 wiring pins are PTB1/IRQ_9 ends, and No. 13 wiring pins are vacant；No. 14 wiring pins are PTB2/IRQ_10/LLWU_P5 ends,
And No. 14 wiring pins are vacant；No. 15 are PTA8 ends, and No. 15 wiring pins are vacant；No. 19 wiring pins are PTB5/IRQ_16 ends, and 19
Number wiring pin is vacant；No. 20 wiring pins are PTA12/IRQ_17 ends, and No. 20 wiring pins are vacant；No. 21 wiring pins are PTB13 ends,
And No. 21 wiring pins are vacant；No. 22 wiring pins are PTA0/IRQ_0/LLWU_P7/SWD_CLK ends, and No. 22 wiring pins meet SWD_
CLK ends.
Using the beneficial effect of the technical program：The circuit can be placed in F types coating probe, and user need to only purchase to be equipped with and be somebody's turn to do
The F types coating probe of circuit, and download free APP softwares on mobile terminals and can reduce instrument cost to use, carry
High instrument performance, powerful data-handling capacity, data dump ability, data transmission capabilities, enhances instrument portability, one
Root percussion mechanism, which only needs to a simple packaging, can just be carried, and heavy instrument container need not be used to scene.
Experiment proves that, it ensure that calibrator measures the accuracy of coating layer thickness using the circuit, its measurement error does not surpass
± the 0.01% of tested coating layer thickness is crossed, measurement accuracy is high, dependable performance improves the service life and stability of calibrator, treated
Machine and up to 1 year, effectively improves the performance of calibrator.
Brief description of the drawings
Fig. 1 is ferromagnetic type coating thickness detector control section circuit diagram of the invention.
Fig. 2 is the power supply power pack circuit diagram behind POWER_EN ends in Fig. 1.
Fig. 3 is the interface circuit diagram that F types coating is popped one's head in.
Fig. 4 is amplifying circuit at TLC27M9ID chips.
Fig. 5 is calibrator schematic block circuit diagram of the invention.
Embodiment
For purposes of illustration only, below in conjunction with the accompanying drawings, to the ferromagnetic type coating thickness detector electricity based on mobile display terminal of invention
Road elaborates.
As shown in Fig. 1 to Fig. 5, a kind of ferromagnetic type coating thickness detector circuit based on mobile display terminal, including F types are applied
Layer probe, audio jack, 3 core cables, data acquisition and code modulated circuits module.
The data acquisition and code modulated circuits module include data processing circuit.
The described ferromagnetic type coating thickness detector circuit based on mobile display terminal, described data processing circuit includes type
Number be MKL05Z32VFK4 U5 microcontrollers, the U5 microcontrollers include 1 ~ No. 24, amount to 24 wiring pins；
No. 1 wiring pin is PTB6/IRQ_2 ends, and No. 1 wiring pin connects F1 ends,
No. 2 wiring pins are PTB7/IRQ_3 ends, and No. 2 wiring pins are vacant；
No. 3 wiring pins are VDD VREFH ends, and No. 3 wiring pins are connected to Vin ends, and No. 3 wiring pins are further connected with electric capacity C25, electric capacity
C25 other end ground connection；
No. 4 wiring pins are VREFL VSS ends, No. 4 wiring pin ground connection；
No. 5 wiring pins are PTA3/EXTAL0 ends, and No. 6 wiring pins are PTA4/LLWU_P0/XTAL0 ends, No. 5 wiring pins and 6
It is connected between number wiring pin by resistance R5, and crystal oscillator X2 is parallel with resistance R5, crystal oscillator X2 both sides passes through electric capacity respectively
C31 and electric capacity C32 ground connection；
No. 7 wiring pins are PTA5/LLWU_P1/RTC_CLKIN ends, and No. 7 wiring pins are vacant；
No. 8 wiring pins are PTA6/LLWU_P2 ends, and No. 8 wiring pins are vacant；
No. 9 wiring pins are PTB10 ends, and No. 9 wiring pins are vacant；
No. 10 wiring pins are PTB11 ends, and No. 10 wiring pins are vacant；
No. 11 wiring pins are PTA7/IRQ_7/LLWU_P3 ends, and No. 11 wiring pins are vacant；
No. 12 wiring pins are PTB0/IRQ_8/LLWU_P4 ends, and No. 12 wiring pins connect SHUTDOWN ends；
No. 13 wiring pins are PTB1/IRQ_9 ends, and No. 13 wiring pins are vacant；
No. 14 wiring pins are PTB2/IRQ_10/LLWU_P5 ends, and No. 14 wiring pins are vacant；
No. 15 are PTA8 ends, and No. 15 wiring pins are vacant；
No. 16 wiring pins are PTA9 ends, are connected to POWER_EN ends.
Power supply circuit is connected to behind POWER_EN ends, the power supply circuit is the resistance R7, resistance R7 that POWER_EN ends are followed by
After be connected to after electric capacity C21, electric capacity C21 and be grounded, be connected to electric capacity C3 after resistance R7, electric capacity C3 is polarized electric capacity, positive pole side with
Resistance R7 is connected, and is grounded after electric capacity C3, is further connected with after resistance R7 after resistance R24, resistance R24 and is connected to resistance R23, resistance R23
After be grounded, be connected to inductance L1 after diode D20, diode D20 are further connected with after resistance R7；
Also include model TPS61040DBV U4 controllers, the SW ends of U4 controllers and diode D20 positive terminal
It is connected, the GND ends of U4 controllers are grounded, and are connected after resistance R24 with the FB ends of U4 controllers, with U4 controllers after inductance L1
Vin ends be connected, the En of U4 controllers termination SHUTDOWN ends are further connected with electric capacity C30 after inductance L1, and electric capacity C30 is has pole
Property electric capacity, positive pole side is connected with inductance L1, is grounded after electric capacity C30, and button cell P3 is further connected with after inductance L1；
Model SI2323DS FET is further connected with behind POWER_EN ends, the G of FET terminates POWER_EN ends,
D termination+5V_F the power supplys of FET, the S terminations of FET are connected with diode D20 negative pole end, the D of FET
End is further connected with after diode VQ5, diode VQ5 to be connected with the S ends of FET, and TP1 ends are further connected with after resistance R7；
No. 17 wiring pins are PTB3/IRQ_14 ends, are connected to behind STK_TX ends, STK_TX ends and are connected to resistance R11, resistance R11
Parallel connection is connected to after electric capacity C8 and electric capacity C9, electric capacity C9 and is grounded afterwards, is connected to after resistance R12, resistance R12 and is grounded after electric capacity C8, electric capacity
MIC ends are further connected between C8 and resistance R12；
No. 18 wiring pins are PTB4/IRQ_15/LLWU_P6 ends, are connected to behind STK_RX ends and are connected to electric capacity C5, electric capacity C5 is followed by
Have to be further connected with after resistance R9, resistance R9 behind LEFT ends, STK_RX ends and be connected to Vin ends, resistance R10 is further connected with behind STK_RX ends, electricity
Hinder and be grounded after R10；
No. 19 wiring pins are PTB5/IRQ_16 ends, and No. 19 wiring pins are vacant；
No. 20 wiring pins are PTA12/IRQ_17 ends, and No. 20 wiring pins are vacant；
No. 21 wiring pins are PTB13 ends, and No. 21 wiring pins are vacant；
No. 22 wiring pins are PTA0/IRQ_0/LLWU_P7/SWD_CLK ends, and No. 22 wiring pins connect SWD_CLK ends；
No. 23 wiring pins are PTA1/IRQ_1/RESET_b ends, and No. 23 wiring pins are followed by nRESET ends, and nRESET ends are followed by
Have to be connected to behind Vin ends, nRESET ends after resistance R51, resistance R51 and be further connected with electric capacity C41, be grounded after electric capacity C41, behind nRESET ends
Electric capacity C6 is further connected with, electric capacity C6 is followed by RIGHT ends.
Also include measuring circuit, the measuring circuit is that PF1 is the interface that F types coating is popped one's head in, and PF1 is provided with three wiring
No. 1 wiring pin on pin, PF1, which is connected to after+2V_F power supplys ,+2V_F power supplys, is connected to resistance R40, and resistance R47 is connected to after resistance R40,
Operational amplifier U2C is connected to after resistance R40, and resistance R40 is connected with operational amplifier U2C reverse input end, resistance
Output end after R47 with operational amplifier U2C is connected, No. 2 wiring pins and fortune being parallel with resistance R47 on electric capacity C4, PF1
The input in the same direction for calculating amplifier U2C is connected, and on PF1 No. 1 wiring pin passes through resistance R13 phases with No. 2 wiring pins on PF1
Connection,
Operational amplifier U2C output is terminated with after resistance R41, resistance R41 being connected to computing after being connected to electric capacity C7, electric capacity C7
Amplifier U2D, operational amplifier U2D input in the same direction are connected with electric capacity C7, and the reverse input end of operational amplifier is connected to+
2V_F ends, operational amplifier U2D output is terminated with the input in the same direction after resistance R49, resistance R49 with operational amplifier U2D
It is connected,
Operational amplifier U2D output is terminated with after resistance R42, resistance R42 being connected to fortune after being connected to resistance R37, resistance R37
Amplifier U2B is calculated, operational amplifier U2B reverse input end is connected with resistance R37, operational amplifier U2B input in the same direction
+ 2V_F ends are terminated with, operational amplifier U2B output end is connected by resistance R14 with No. 3 wiring pins on PF1, and computing is put
Big device U2B reverse input end is connected after being further connected with electric capacity C45, electric capacity C45 with operational amplifier U2B output end,
Operational amplifier U2D input in the same direction is connected by resistance R8 with operational amplifier U2B output end,
Operational amplifier U2D output end is further connected with model 74LVC1G14DBVR IC chip, the NC of the IC chip
End is vacant, and 1A ends are connected with operational amplifier U2D output end, GND ends ground connection, Vcc termination Vin ends, 1Y termination FI ends,
The Vin ends are connected with R51.
Also include amplification treatment circuit, the amplification treatment circuit be+2V_F ends after be connected to operational amplifier U2A, computing
Amplifier U2A reverse input end is connected with+2V_F ends, and operational amplifier U2A reverse input end passes through resistance R15 and fortune
The output end for calculating amplifier U2A is connected, and operational amplifier U2A input in the same direction is terminated with resistance R18, and resistance R18 is followed by
Ground, operational amplifier U2A input in the same direction, which is further connected with after resistance R16, resistance R16, is connected to electric capacity C10, and electric capacity C10 is to have pole
Property electric capacity, electric capacity C10 positive pole is connected with resistance R16, and electric capacity is connected to after resistance R17, resistance R17 are connected to after resistance R16
It is grounded after C18, electric capacity C18 ,+5V_F ends is connected to after resistance R17, model TLC27M9ID is provided between+5V_F ends and earth terminal
IC chip, mainly formed by four operational amplifiers are integrated inside TLC27M9ID types IC chip.
Resistance R7=100K the Ω, electric capacity C21=0.1uF, electric capacity C3=10uF, resistance R24=2M Ω, resistance R23=1.5M
Ω, diode D20 are MBR0530 types, inductance L1=10uH, electric capacity C30=4.7uF, resistance R12=1K Ω, electric capacity C8=10uF, electricity
Hinder R11=10K Ω, electric capacity C9=4.7nF, electric capacity C5=0.1uF, resistance R9=500K Ω, resistance R10=500 K Ω, electric capacity C6=
0.1uF, electric capacity C41=1uF, resistance R51=10K Ω, electric capacity C25=0.1uF, resistance R5=1M Ω, crystal oscillator X2=32.768MHz,
Electric capacity C31=5.6pF, electric capacity C32=5.6pF, electric capacity C10=1 uF, resistance R4=100K Ω, resistance R3=100K Ω, resistance R18=
The uF of 20K Ω, resistance R16=30K Ω, electric capacity C10=4.7 uF, resistance R17=6810 Ω, electric capacity C18=0.1, resistance R15=100
The Ω of Ω, resistance R13=1823 Ω, resistance R40=6810 Ω, resistance R47=1823, the types of electric capacity C4 models L39 683, resistance R14
The Ω of=4020 Ω, resistance R41=4752, the types of electric capacity C7 models L20 224, the Ω of resistance R49=1823 Ω, resistance R8=1213, fortune
It is TLC27M9ID types to calculate amplifier U2A, operational amplifier U2B, operational amplifier U2C, operational amplifier U2D model, electricity
Hinder the Ω of R42=6810 Ω, resistance R37=2325, the types of electric capacity C45 models L32 334.
One of main points of the present invention are the developments of special F types coating probe, the second is developing supporting APP on mobile terminals
Software, and the key of F types coating probe is lain also in the design of circuit, the special percussion mechanism includes 3.5mm audio jacks, 3
Core cable, data acquisition and code modulated circuits module 1, percussion mechanism probe, circuit module can both collect because its small volume
Into inside being popped one's head in percussion mechanism, it may alternatively be integrated within audio-frequency electric cable（Similar to the line traffic control terminal of walkman）, according to audio
Cable total length is about 1.5m.
The operation principle of the present invention is that oscillating circuit is powered using 5V, primary coil of F probes, secondary coil, common port difference
U2 10 wiring pins, resistance R14 one end, 2V is met, the frequency of oscillating circuit is exported from U2 14 wiring pins, and output signal is passed through
1 wiring pin that one buffered gate V1 progress shaping is input to U5 is measured.Buffered gate V1 effect, one is to make waveform programming rule
Square wave then, is easy to measurement, the second is carrying out 5V to 3.3V level conversion.
The key of the present invention is to be the connection, miniaturization, low power dissipation design of circuit module.Reduce device body as far as possible first
Product, is that this circuit is built using following device：Microprocessor uses MKL05Z32VFK4（QFN24 is encapsulated）, crystal oscillator uses 2520
Encapsulation, except the higher resistance of precision requirement, remaining is encapsulated capacitance resistance ware using 0402.
Because the oscillating circuit of F type coating thickness measurings needs 5V voltages, and microcontroller then can not be in this operating at voltages.
The thinking for solving this problem is to use two-way voltage-stabilized power supply, but the key of the present invention is miniaturization and low-power consumption.Therefore, this hair
Bright use battery is directly powered to microcontroller U5, and boost to 5V only with 1 tunnel powers to measuring circuit, why can be so
Do be because：Coating thickness detector measurement is frequency signal, it is not necessary to stable voltage reference.
P3 is 3V button cells, also should be in more than 2.3V when voltage is low, and the microcontroller used in the present invention
Operating voltage can be between 1.8V-3.6V.
RIGHT is the R channel output of 3.5mm audio ports, from mobile terminal APP（Such as mobile phone）, the signal can be right
Microcontroller is resetted.After reset, APP sends the instruction for starting work by LEFT to microcontroller U5.Now microcontroller
When device U5 program enables SHUTDOWN and POWER_EN, SHUTDOWN high level according to instruction, TPS61040 boostings, output is steady
Fixed 5V, after POWER_EN is pulled low, F type measuring circuits work on power, and export 1 pin that frequency signal N1 all the way is input to U5,
The Timer timing modules of this pin correspondence microprocessor, can be with measurement signal N1 frequency.With the frequency that is implanted into advance and
Corresponding relation between coating layer thickness, can calculate coating layer thickness.After having measured, U5 carries out coding to measurement result and passed through
17 human hair combing wastes give the APP of mobile terminal.
When that need not measure, circuit needs to enter holding state, and its process is：Microcontroller U5 detects APP
Do not send for a long time after measurement instruction, SHUTDOWN is set to low level, now TPS61040 stops boosting, due to battery electricity
Pressure supplies microcontroller U5, therefore microcontroller can still work, but enters low-power consumption mode.Microprocessor program draws high POWER_
EN (U5 16 pin), stopping is powered to measuring circuit, now only gives microprocessor and several resistance equivalent to battery（R9, R10,
R23, R24）Power supply.Microcontroller U5 standby current can drop to 2 μ A or so, and R9, R10, R23, R24 consumption electric currents are no more than
3 μ A, U4 typical case Shutdown electric currents are 1 μ A, therefore in the standby state, total current is about in 6 μ A, and this power consumption can allow
The standby operation of whole system more than 1 year（It is assumed that battery 50mA）.Therefore on/off circuit need not be used.
The present invention improves mobile terminal service efficiency, and lowering apparatus cost is only 4 one-tenth of common detector cost, uses
This pattern, single-chip microcomputer can except data acquisition and data encoding are almost without other tasks, therefore its measuring speed and
Precision is all that traditional coating thickness measuring circuit is incomparable, so that measurement is more accurate, measurement accuracy is high, will be somebody's turn to do at present
The detection error that is difficult to capture in industry is contracted to ± %1 from ± 3%, and automaticity is higher, solves the networking of instrument
Problem, data backup problem, small volume, long lifespan, due to the low factor of power consumption, the detector life-span for being configured with the circuit carries
Rise 2.5 times.
Experiment proves that, surveyed using the ferromagnetic type coating thickness detector circuit calibrator based on mobile display terminal of the present invention
Coating layer thickness is measured, its measurement error is no more than ± the 0.01% of tested coating layer thickness, and measurement accuracy is high, dependable performance.
In the above-described embodiments, the preferred forms to the present invention are described, it is obvious that in the invention structure of the present invention
Under think of, many changes can be still made.Here, it should be noted that any change made under the inventive concept of the present invention all will
Fall within the scope of protection of the present invention.
Claims (1)
1. a kind of ferromagnetic type coating thickness detector circuit based on mobile display terminal, it is characterized in that：Including F types coating probe, sound
Frequency plug, 3 core cables, data acquisition and code modulated circuits module, the data acquisition and code modulated circuits module include
Data processing circuit；Described data processing circuit includes model MKL05Z32VFK4 U5 microcontrollers, the U5 micro-controls
Device processed includes 1 ~ No. 24, amounts to 24 wiring pins, wherein No. 5 wiring pins of the U5 microcontrollers are PTA3/EXTAL0 ends, 6
Number wiring pin is PTA4/LLWU_P0/XTAL0 ends, is connected between No. 5 wiring pins and No. 6 wiring pins by resistance R5, and electricity
Crystal oscillator X2 is parallel with resistance R5, crystal oscillator X2 both sides are grounded by electric capacity C31 and electric capacity C32 respectively；The 3 of the U5 microcontrollers
Number wiring pin is VDD VREFH ends, and No. 3 wiring pins are connected to Vin ends, and No. 3 wiring pins are further connected with electric capacity C25, and electric capacity C25's is another
End ground connection；No. 17 wiring pins of the U5 microcontrollers are PTB3/IRQ_14 ends, are connected to STK_TX ends, STK_TX is connected to behind end
Parallel connection is connected to after electric capacity C8 and electric capacity C9, electric capacity C9 and is grounded after resistance R11, resistance R11, and resistance R12, resistance are connected to after electric capacity C8
It is grounded after R12, MIC ends is further connected between electric capacity C8 and resistance R12；No. 18 wiring pins of the U5 microcontrollers are PTB4/
IRQ_15/LLWU_P6 ends, are connected to behind STK_RX ends and are connected to electric capacity C5, and LEFT ends are connected to after electric capacity C5, and STK_RX is further connected with behind end
It is connected to after resistance R9, resistance R9 behind Vin ends, STK_RX ends and is further connected with resistance R10, is grounded after resistance R10；The U5 microcontrollers
No. 23 wiring pins be PTA1/IRQ_1/RESET_b ends, No. 23 wiring pins are followed by nRESET ends, and nRESET is connected to resistance behind end
It is connected to after R51, resistance R51 behind Vin ends, nRESET ends and is further connected with electric capacity C41, be grounded after electric capacity C41, nRESET is further connected with behind end
Electric capacity C6, electric capacity C6 is followed by RIGHT ends；
No. 16 wiring pins of the U5 microcontrollers are PTA9 ends, are connected to behind POWER_EN ends, POWER_EN ends and are connected to power supply electricity
It is connected to after electric capacity C21, electric capacity C21 and is grounded after road, the resistance R7 that the power supply circuit is followed by for POWER_EN ends, resistance R7, electricity
Electric capacity C3 is connected to after resistance R7, electric capacity C3 is polarized electric capacity, and positive pole side is connected with resistance R7, is grounded after electric capacity C3, resistance
It is further connected with after R7 after resistance R24, resistance R24 and is connected to resistance R23, be grounded after resistance R23, diode D20 is further connected with after resistance R7
, inductance L1 is connected to after diode D20；
Also include model TPS61040DBV U4 controllers, the SW ends of U4 controllers are connected with diode D20 positive terminal
Connect, the GND ends ground connection of U4 controllers, be connected after resistance R24 with the FB ends of U4 controllers, with U4 controllers after inductance L1
Vin ends be connected, the En of U4 controllers termination SHUTDOWN ends are further connected with electric capacity C30 after inductance L1, and electric capacity C30 is has
Polar capacitor, positive pole side is connected with inductance L1, is grounded after electric capacity C30, and button cell P3 is further connected with after inductance L1；
Model SI2323DS FET, the G termination POWER_EN ends of FET, field effect are further connected with behind POWER_EN ends
Should pipe D termination+5V_F power supplys, FET S termination is connected with diode D20 negative pole end, the D ends of FET are also
It is connected to after diode VQ5, diode VQ5 and is connected with the S ends of FET, TP1 ends is further connected with after resistance R7；
No. 1 wiring pin is PTB6/IRQ_2 ends, and No. 1 wiring pin connects F1 ends, and FI is terminated with measuring circuit, and the measuring circuit is
No. 1 wiring pin that PF1 is provided with three wiring pins, PF1 is connected to resistance R40, resistance after being connected to+2V_F power supplys ,+2V_F power supplys
It is connected to after R40 after resistance R47, resistance R40 and is connected to operational amplifier U2C, and resistance R40 and operational amplifier U2C's is reverse defeated
Enter end to be connected, the output end after resistance R47 with operational amplifier U2C is connected, be parallel with resistance R47 on electric capacity C4, PF1
No. 2 wiring pins be connected with operational amplifier U2C input in the same direction, No. 2 wiring on PF1 No. 1 wiring pin and PF1
Pin is connected by resistance R13；
Operational amplifier U2C output is terminated with after resistance R41, resistance R41 being connected to operation amplifier after being connected to electric capacity C7, electric capacity C7
Device U2D, operational amplifier U2D input in the same direction are connected with electric capacity C7, and the reverse input end of operational amplifier is connected to+2V_F
End, operational amplifier U2D output is terminated with after resistance R49, resistance R49 being connected with operational amplifier U2D input in the same direction
Connect；
Operational amplifier U2D output, which is terminated with after resistance R42, resistance R42 being connected to, to be connected to computing after resistance R37, resistance R37 and puts
Big device U2B, operational amplifier U2B reverse input end are connected with resistance R37, operational amplifier U2B input in the same direction termination
There are+2V_F ends, operational amplifier U2B output end is connected by resistance R14 with No. 3 wiring pins on PF1, operational amplifier
U2B reverse input end is connected after being further connected with electric capacity C45, electric capacity C45 with operational amplifier U2B output end；
Operational amplifier U2D input in the same direction is connected by resistance R8 with operational amplifier U2B output end；
Operational amplifier U2D output end is further connected with model 74LVC1G14DBVR IC chip, and the NC ends of the IC chip are empty
Put, 1A ends are connected with operational amplifier U2D output end, GND ends ground connection, Vcc termination Vin ends, 1Y termination FI ends are described
Vin ends are connected with R51；
Also include amplification treatment circuit, the amplification treatment circuit be+2V_F ends after be connected to operational amplifier U2A, operation amplifier
Device U2A reverse input end is connected with+2V_F ends, and operational amplifier U2A reverse input end is put by resistance R15 with computing
Big device U2A output end is connected, and operational amplifier U2A input in the same direction is terminated with being grounded after resistance R18, resistance R18, fortune
Calculation amplifier U2A input in the same direction, which is further connected with after resistance R16, resistance R16, is connected to electric capacity C10, and electric capacity C10 is polarized electricity
Hold, electric capacity C10 positive pole is connected with resistance R16, is connected to after resistance R16 after resistance R17, resistance R17 and is connected to electric capacity C18, electricity
Hold and be grounded after C18 ,+5V_F ends are connected to after resistance R17, it is integrated provided with model TLC27M9ID between+5V_F ends and earth terminal
Circuit chip；
No. 2 wiring pins of the U5 microcontrollers are PTB7/IRQ_3 ends, and No. 2 wiring pins are vacant；
No. 4 wiring pins are VREFL VSS ends, No. 4 wiring pin ground connection；
No. 7 wiring pins are PTA5/LLWU_P1/RTC_CLKIN ends, and No. 7 wiring pins are vacant；
No. 8 wiring pins are PTA6/LLWU_P2 ends, and No. 8 wiring pins are vacant；
No. 9 wiring pins are PTB10 ends, and No. 9 wiring pins are vacant；
No. 10 wiring pins are PTB11 ends, and No. 10 wiring pins are vacant；
No. 11 wiring pins are PTA7/IRQ_7/LLWU_P3 ends, and No. 11 wiring pins are vacant；
No. 12 wiring pins are PTB0/IRQ_8/LLWU_P4 ends, and No. 12 wiring pins connect SHUTDOWN ends；
No. 13 wiring pins are PTB1/IRQ_9 ends, and No. 13 wiring pins are vacant；
No. 14 wiring pins are PTB2/IRQ_10/LLWU_P5 ends, and No. 14 wiring pins are vacant；
No. 15 are PTA8 ends, and No. 15 wiring pins are vacant；
No. 19 wiring pins are PTB5/IRQ_16 ends, and No. 19 wiring pins are vacant；
No. 20 wiring pins are PTA12/IRQ_17 ends, and No. 20 wiring pins are vacant；
No. 21 wiring pins are PTB13 ends, and No. 21 wiring pins are vacant；
No. 22 wiring pins are PTA0/IRQ_0/LLWU_P7/SWD_CLK ends, and No. 22 wiring pins connect SWD_CLK ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410506417.5A CN104266578B (en) | 2014-09-28 | 2014-09-28 | Ferromagnetic type coating thickness detector circuit based on mobile display terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410506417.5A CN104266578B (en) | 2014-09-28 | 2014-09-28 | Ferromagnetic type coating thickness detector circuit based on mobile display terminal |
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| Publication Number | Publication Date |
|---|---|
| CN104266578A CN104266578A (en) | 2015-01-07 |
| CN104266578B true CN104266578B (en) | 2017-08-01 |
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20060032489A (en) * | 2004-10-12 | 2006-04-17 | 엘지전자 주식회사 | Length measuring apparatus for mobile terminal |
| CN103575202A (en) * | 2012-08-06 | 2014-02-12 | 富泰华工业（深圳）有限公司 | Electronic device and test system with function of measuring thickness of coating layer |
| CN203216612U (en) * | 2013-05-20 | 2013-09-25 | 陈小勇 | Audio-plug-type thermometer |
| CN203851366U (en) * | 2014-03-11 | 2014-09-24 | 青岛智感信息技术有限公司 | Circuit board device capable of connecting different sensors |
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| CN104266578A (en) | 2015-01-07 |
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Denomination of invention: Circuit of ferromagnetic coating thickness gauge based on mobile display terminal Effective date of registration: 20211011 Granted publication date: 20170801 Pledgee: Weifang rural commercial bank Limited by Share Ltd. hi tech sub branch Pledgor: SHANDONG IPRE DETECTION TECHNOLOGY Co.,Ltd. Registration number: Y2021980010555 |
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Date of cancellation: 20220922 Granted publication date: 20170801 Pledgee: Weifang rural commercial bank Limited by Share Ltd. hi tech sub branch Pledgor: SHANDONG IPRE DETECTION TECHNOLOGY CO.,LTD. Registration number: Y2021980010555 |
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Denomination of invention: A Ferromagnetic Coating Thickness Gauge Circuit Based on Mobile Display Terminals Effective date of registration: 20230516 Granted publication date: 20170801 Pledgee: Bank of Weifang Limited by Share Ltd. Dongming branch Pledgor: SHANDONG IPRE DETECTION TECHNOLOGY CO.,LTD. Registration number: Y2023980040726 |