CN206440980U - A kind of SCM Based intelligent material control device - Google Patents

Abstract

The utility model discloses the SCM Based intelligent material control device of one kind, including Master control chip and the connected weight signal collecting unit of difference and direct current motor system control unit；The weight signal collecting unit gathers weight of material, sends Master control chip to；The direct current motor system control unit includes current detection circuit, Rotating speed measring circuit and PWM control modules, it is respectively used to detect the electric current and rotary speed information of direct current motor system, and Master control chip is sent to, Master control chip controls the operation of direct current motor system by PWM control modules.Weight signal is converted into voltage signal by the utility model by load sensor, it is then passed to single-chip microcomputer, single-chip microcomputer sends trigger pulse control signal to control the angle of flow or dutycycle of converters, carry out the armature voltage size of controlled motor, so as to reach the purpose of control rotation speed change, have the advantages that simple in construction, comprehensive, the with low cost, stability of detection is preferable.

Description

A kind of SCM Based intelligent material control device

Technical field

The utility model is related to material security configuration technology, more particularly to a kind of SCM Based intelligent batching control dress Put.

Background technology

Feed proportioning system has originated from 19 end of the centurys, since the industrial revolution, the development that every new technology is advanced by leaps and bounds, with belt The appearance of Transmission system, feed proportioning system also meets the tendency of.Earliest belt transmission system weighing principle comes from bucket conveyor To the device of the continuous automatic weighing of bulk material.After World War II, with sensor technology, electronic technology it is swift and violent Development, the development of feed proportioning system is also to advance by leaps and bounds.

The development of feed proportioning system substantially experienced the following four stage：

First stage is the Purely mechanical feed proportioning system in last century five, the sixties, is generally swept using mechanical, photo-electric Retouch or incremental encoder etc., the feed proportioning system in this stage only there is identification to count and startup function.

Second stage is the sensor electronic instrument feed proportioning system in the 60 to 70's, with analog circuit and digital circuit Develop rapidly, engendered the dispensing electrodynamic instrument of various miniaturizations.Balance, identification and accumulative meter can be realized with instrument The functions such as calculation.

3rd, fourth stage be 20th century late nineteen seventies microcomputer-based intelligent feed proportioning system.Computer is drawn first Enter electronic proportioning system, substantially increase its integrated level.Feed proportioning system cumulative amount computing now instead of using summation Integration method.

The feed proportioning system in first and second stage can only carry out simply measurement, cumulative calculation, and the degree of accuracy is not high, to being Change in system running is uncontrollable, therefore its metering process degree of accuracy is low, bad dynamic performance, deficient in stability.And the 3rd, the feed proportioning system controller set in four stages microcomputer technology, testing technology, mechanics of communication, network technology, industry control The technologies such as system, not only increase the accuracy of metering, and to it in metering process produced problem can monitor in real time and Control, meanwhile, automatically controlling for the function such as display, alarm, zeroing of instrument is also more and more perfect.And the development of mechanics of communication is more It is the function for the remote maintenance and diagnosis and data transfer for enhancing instrument.

Research and development and design aspect in automatic batching system, the starting of European and American developed countries are more early, and China at that time exists Under the governance of Qing Government, foreign policy of seclusion is taken so that China does not introduce these advanced technologies timely.Opium After war, some advanced intellectuals of China come to realise the powerful of western sciences technology, and the ludicrous conceit stemming from pure ignorance has been removed gradually Eyes, take a broad view the world, start felt one's way under the compressing of the Western imperialist powers.

After founding of New, government pays much attention to the development of science and technology.The science and technology of China is advanced by leaps and bounds, constantly Overcome technical problem.Wherein batching control system has its important function crucial as one in terms of each production field Link is even more to achieve great success.

In recent years, developing rapidly with computer technology, to original feed proportioning system carry out technical elements improve into For inevitable trend, it is proposed that by data acquisition, automatically control, remotely monitor, alarm, operational management, frequency control etc. it is many The technical improvement method of aspect.When production task is heavy, it is desirable to which system can accelerate speed of production, centralized Control motor Startup, browse production industrial flow chart, make the functions such as accident alarming response, the regulation motor speed of service, realize required work( The centralized Control of energy, this requires system to realize remote control function, and field apparatus is monitored in real time.

First, the generation of large scale integrated chip (LSI chip) and obtain basic extensively using the control system for causing stable safety Ensure, but under some harsh environment, the system failure still occurs often, cause product that we produce can because External disturbance dispensing lack of proper care and it is unqualified, so system has much room for improvement in the antijamming capability of adverse circumstances.

Second, among the industrial production especially in chemical technology, there are high requirement, one to the proportioning accuracy of material As Ingredient Automatic Control System be difficult meet require, it is necessary to develop the equipment of high precision and high sensitivity to realize a this kind of industry The production automation.For this point, we in hardware aspect except taking some measures, the higher component of selection performance： It can also be made an effort on software programming.

3rd, although modern industrial automation brings great convenience to our production and living, at the same time Harmful effect is also generated to environment, it would be desirable in process of production using some means cause our production it is more environmentally friendly, It is more energy efficient, conscientiously implement the strategy of sustainable development.

Analysis more than, it can be seen that Ingredient Automatic Control System is also perfect by some, with very deep Research Significance.

In view of above-mentioned prior art, the applicant has made beneficial design, technical scheme described below be Produced under this background.

Utility model content

The utility model purpose is：A kind of SCM Based intelligent material control device is provided, with simple in construction, inspection The advantages of comprehensive, with low cost, stability is preferable is surveyed, with good application value.

The technical solution of the utility model is：

A kind of SCM Based intelligent material control device, including Master control chip and the connected weight letter of difference Number collecting unit and direct current motor system control unit；The weight signal that the weight signal collecting unit includes being sequentially connected is adopted Collector, signal filtering amplifying circuit and A/D change-over circuits, are respectively used to gather weight of material, and it is amplified to gather signal Again by sending Master control chip to after analog-to-digital conversion；The direct current motor system control unit includes current detection circuit, turned Speed detection circuit and PWM control modules, are respectively used to detect the electric current and rotary speed information of direct current motor system, and are sent to master control Coremaking piece, Master control chip controls the operation of direct current motor system by PWM control modules.

It is preferred that, described Master control chip uses AT89C52 single-chip microcomputers.

It is preferred that, the weight signal Acquisition Circuit uses resistance strain sensor semibridge system measuring circuit.

It is preferred that, the filter amplification circuit is amplified using AD620 chips to the weight signal detected.

It is preferred that, the A/D change-over circuits will amplify obtained mould using 8 A/D converter ADC0809 by AD620 Intend signal and be converted to data signal.

It is preferred that, the PWM control modules, as buffer circuit, obtain constant DC voltage using IGBT.

It is preferred that, the current detection circuit of described direct current motor system is sensed using LA25A-NP Hall-types DC current Device, DC bus current is flowed into from LA25A-NP I+ pins, and two secondary side electric currents are exported by M pins, the voltage signal collected 0~5V magnitude of voltage is enlarged into through ratio amplifier LM345, enters ADC0809 A/D inputs, export and connect 5.1V voltage-stabiliser tubes with Protect ADC0809 A/D input ports.Output signal connects ADC0809 IN-1 ports.

It is preferred that, described Rotating speed measring circuit is used as revolution speed sensing using the photoelectric encoder of raster count N=1024 lines Device, the tachometer pulse frequency that photoelectric encoder is produced has fixed proportionate relationship with motor speed, using M/T method speed measurement treatments.

It is preferred that, described Master control chip is also associated with Key and display circuit, and core is extended as I/O using 8155H Piece, system keyboard and display interface device chip are used as using 8279；The keyboard is using 4 × 4 row-column configurations, 16 keys of composition Matrix keyboard；Display circuit uses line decoder 74LS154 and the LED digital display tube of 4 line -16.

It is preferred that, the power-supply system of described feed proportioning system automatic control system uses whole by power transformer, diode The voltage-stabilized power supply of current circuit, filter circuit and the part of mu balanced circuit four composition provide single-chip microcomputer, d type flip flop 4013, AD0809, SN74191 needs+5V power supplys, AD620 needs ± 5V, bridge measuring circuit needs ± 12V linear power supply, LA25A-NP needs ± 12V power supply.

The utility model has the advantages that：

SCM Based intelligent material control device provided by the utility model, is believed weight by load sensor Number be converted into voltage signal, the voltage signal after filtering, signal amplification, the ultra-weak electronic signal collected is converted into a cover half Analog quantity gives A/D converter and is converted to data signal again, is then passed to single-chip microcomputer, by I/O mouthfuls of transmission trigger pulse control signals To control the angle of flow or dutycycle of converters, carry out the armature voltage size of controlled motor, so as to reach control The purpose of rotation speed change processed.Have the advantages that simple in construction, comprehensive, the with low cost, stability of detection is preferable, should with good With value.

Brief description of the drawings

Below in conjunction with the accompanying drawings and embodiment is further described to the utility model：

Fig. 1 is SCM Based intelligent material control device block diagram module map described in the utility model；

Fig. 2 is the electrical schematic diagram of weight signal Acquisition Circuit described in the utility model；

Fig. 3 is the electrical schematic diagram of signal filtering amplifying circuit described in the utility model；

Fig. 4 is the electrical schematic diagram of A/D change-over circuits described in the utility model；

Fig. 5 is the minimum system electrical schematic diagram of single-chip microcomputer described in the utility model；

Fig. 6 is the electrical schematic diagram of IGBT buffer circuits described in the utility model；

Fig. 7 is pwm converter circuit electrical schematic diagram described in the utility model；

Fig. 8 is overall connection current signal collection change-over circuit figure of the present utility model.

Fig. 9 is that rate signal of the present utility model detects circuit interconnect pattern electrical schematic diagram.

Figure 10 is pwm signal generation circuit described in the utility model；

Figure 11 is the electrical schematic diagram of PWM drive circuit figure described in the utility model；

Figure 12 is the electrical schematic diagram of the interface circuit of 8155H described in the utility model and single-chip microcomputer；

Figure 13 is the electrical schematic diagram of keyboard wiring diagram described in the utility model；

Figure 14 is the electrical schematic diagram of keyboard-display circuit wiring diagram described in the utility model；

Figure 15 is voltage-stabilized power supply circuit flow chart described in the utility model；

Figure 16 is power circuit principle figure described in the utility model；

Figure 17 is+15V power supplys of the present utility model and Power Groud power circuit.

Embodiment

As shown in figure 1, the SCM Based intelligent material control device disclosed in the utility model, including master control coremaking Piece and respectively connected weight signal collecting unit and direct current motor system control unit；The weight signal collecting unit Including the weight signal Acquisition Circuit being sequentially connected, signal filtering amplifying circuit and A/D change-over circuits, it is respectively used to gather material Weight, and it is amplified again by sending Master control chip to after analog-to-digital conversion to gather signal；The direct current motor system control Unit includes current detection circuit, Rotating speed measring circuit and PWM control modules, is respectively used to detect the electric current of direct current motor system And rotary speed information, and Master control chip is sent to, Master control chip controls the fortune of direct current motor system by PWM control modules OK.

The system is using AT89C52 series monolithics as main control chip, first by load sensor by weight signal Be converted into voltage signal, the voltage signal after filtering, signal amplification, the ultra-weak electronic signal collected is converted into certain simulation Amount gives A/D converter and is converted to data signal again, is then passed to single-chip microcomputer.By software programming, realize and be directed to the input number Some algorithms of word signal, by I/O mouthfuls send trigger pulse control signals come control converters angle of flow or Person's dutycycle, carrys out the armature voltage size of controlled motor, so as to reach the purpose of control rotation speed change.

Electric machine control system uses der Geschwindigkeitkreis, electric current loop double closed loop speed regulation system, can reach rapid controlled motor rotation speed change, The purposes such as fast and stable rotating speed.System uses high-resolution digital trigger and high accuracy number speed measuring device.Its inner ring is electricity Stream feedback and control ring, outer shroud are motor speed feedback and control ring, and the regulation of inner ring and outer rings is all by AT89C52 microcomputers Software completes the computing of numeral PI control laws.

As shown in Fig. 2 being weight signal acquisition circuit, measuring circuit therein uses most common bridge-type measuring circuit, What is used is resistance strain sensor semibridge system measuring circuit.The characteristics of direct-current bridge is that signal will not be by each element and wire The influence of distributed inductance and electric capacity, strong antijamming capability, but because the output signal of mechanical strain is small, it is desirable to it is steady with high-gain and height Qualitatively amplifier amplifies.Its two foil gauges and two resistance are attached on spring beam, and measurement resistance causes with Gravity changer The change that spring beam is strained and produced, the change of resistance makes the output voltage of bridge-type measuring circuit change, i.e. output voltage Change reflect the change of gravity.When bridge output connects infinitely great load resistance, visual output end is open circuit, now directly Stream electric bridge is referred to as voltage bridge, i.e. only voltage output.

When ignoring the internal resistance of power supply, had by voltage divider principle：

When meeting condition R₁*R₃=R₂*R₄When, i.e.,

R₁/R₂=R₄/R₃ (3-2)

u_o=0, i.e. bridge balance.Formula (3-2) claims equilibrium condition.

Foil gauge measuring bridge makes bridge balance before measuring, so that bridge output voltage and foil gauge sense during measurement The resistance variations caused by strain received are relevant.

If differential work, i.e. R₁=R+ Δs R, R₂=R, R₃=R, R₄=R- Δ R, by formula (3-1), then electric bridge is output as

As shown in figure 3, for weight signal filtering amplifying circuit, via the signal after the circuit transformations such as electric bridge it is fainter and And also many interference signals, it is difficult to it is used directly to show, record, control or carry out signal conversion.Therefore, in measuring circuit often Provided with Simulation scale-up link and filter circuit.The voltage signal of pressure sensor output is millivolt level, wherein high along with some Frequency is disturbed, low-frequency noise etc..So should set in circuit, big a pair electrochemical capacitor filters out low-frequency noise and a pair common Small capacitances eliminate High-frequency Interference.On the other hand, detection circuit requires very high to operational amplifier.The input signal of amplifier is general Exported by sensor.Not only level is low for the output signal of sensor, and internal resistance is high, is also often accompanied by higher common-mode voltage.Cause This, typically there is the following requirement to amplifier：

1st, input impedance should be much larger than singal source resistance.Otherwise, the load effect of amplifier can be such that surveyed voltage causes partially Difference.

2nd, anti-common-mode voltage interference performance is strong.

3rd, have stable and accurate gain in predetermined frequency bandwidth, it is good linear, input drift and noise should be enough The small signal to noise ratio to ensure requirement.So as to ensure that amplifier output performance is stable.

4th, some circuits for adapting to particular requirement can be added.Outer meeting resistance adjustment, convenience such as amplifier gain is accurate Range switching, polarity auto-changing etc..

The system is amplified using AD620 chips to the weight signal detected, and such chip internal is using differential defeated Enter, common-mode rejection ratio is high, differential-mode input impedance is big, and high gain, precision is also very good, and external interface is simple.Can be by changing RG size changes the gain of amplifier.And with small volume, low in energy consumption, precision is high, noise is low and input bias current is low The characteristics of.AD620 is a low cost, high-precision meter amplifier, it is only necessary to which a non-essential resistance sets gain, gain model Enclose for 1 to 10,000.In addition, AD620 power consumptions relatively low (maximum source current only 1.3mA), degree of precision (maximum nonlinearity 40ppm), low maladjustment voltage (most 50V) and low offset drift (maximum 0.6V/ DEG C) characteristic.AD620 is the integrated instrument of three amplifiers Amplifier architecture, for the high accuracy of protection gain control, the triode of its input provides simple differential bipolar input, and adopts Lower input bias current is obtained with β techniques, by the feedback of amplifier inside input stage, the colelctor electrode of input triode is kept Electric current is constant, and input voltage is added on outside gain control resistance Rg.AD620 two internal gain resistance are 24.7k Ω, thus gain equation formula is

G=49.4k Ω/Rg+1 (3-3)

It is for required gain, then outside to control resistance value to be Rg=49.4/ (G-1) k Ω.Resistance R17, R20 and electric capacity C9, C10, C11, C12 are used for the noise for filtering out prime, and C9, C11 are common small capacitances, can filter out High-frequency Interference, C10, C12 For big electrochemical capacitor, it is mainly used in filtering out low-frequency noise.5.1V voltage-stabiliser tubes D16 effect is to be less than AD620 voltage outputs ADC0809 inputs maximum, prevents from causing wafer damage.

As shown in figure 4, being A/D change-over circuits, it is by 8 path analoging switch, address latch decoder, an A/ D converters and a ternary output latch composition.Variable connector can gate 8 analog channels, it is allowed to which 8 tunnel analog quantity timesharing are defeated Enter, share A/D converter and changed.Ternary output lock device is used to latch the digital quantity that A/D is converted, when OE ends are high level When, it can just take the data converted away from ternary output latch.For single-chip microcomputer and ADC0809 interface circuit, I makes It is connected with OR-NOT circuit with single-chip microcomputer as control signal.Logic data signal is sent directly by AT89C52 data port P0 Be connected in ADC0809 8 data lines, ADC0809 address input line A, B, C respectively by the P2.4 of single-chip microcomputer, P2.5, Tri- port controllings of P2.6, any one that can be gated after decoding in eight passages of IN0~IN7 is AD converted, for controlling AD0809 analog signals input channel processed.On the other hand, it is defeated using Chip Microcomputer A LE pins because ADC0809 is without internal clocking Go out the CLK pins that clock signal gives ADC0809 after d type flip flop two divided-frequency.Weight acquisition signal by AD620 amplify with It is followed by ADC0809 IN0 mouths.Interrupt request singal terminates INT0 mouthfuls of inputs of single-chip microcomputer by ADC0809 EOC.

As shown in figure 5, being the minimum system of single-chip microcomputer, system, as control centre, is born using the AT89C52 of ATM companies Duty receives the signal of data and external equipment, reprocesses data, sends control signal, to reach required requirement.Single-chip microcomputer P0 mouthfuls are connected with data wire, the latch 74LS373 of A/D converter.Keyboard, display connect by 8279 with single-chip microcomputer, single Connect after the P1 mouths of piece machine are expanded with 8279 data port, the line of keyboard meets 8279 RL0-RL3, SL0-SL3 warps 74LS138 decoding outputs, connect the alignment of keyboard, and SL0-SL3 is decoded by 74LS154 and exported again, to display after being driven through 7407 Device LED each common cathode.Output line OUTB0-OUTB3, OUTA0-OUTA3 are used as 8 section code selection data Output port, when connecting the simple keyboard within 32 keys, CNTL, SHIFT input of 8279 chips can be grounded.74LS07 cores Piece be 8279 as the section code selection output port of LED numeral method devices driven in phase chip.

Each interface circuit of single-chip microcomputer：An XTAL1 and XTAL2 indirect 12MHz crystal oscillator, two 30pF's in parallel is small Electric capacity constitutes resonance circuit；P1.0-P1.7 connects 8155H chips and first carries out an I/O mouthfuls of extensions, then by 8155H data terminals The DB0-DB7 that PB0-PB7 connects 8279 carrys out control keyboard/display module.P3.0 controls 8155H IO/M mouths.P3.1 is used as 8155H The chip selection signal of chip, controls it to gate work.P2.3 is used as 8279 chip selection signal, controls its work；P0.0-P0.7 connects 74LS373 and ADC0809 is used for realizing A/D modular converters；P2.7 and P3.6 (WR) and P3.7 (RD) connect nor gate and controlled respectively ADC0809 START, ALE and ENABLE port.P3.2 (INT0) is used for receiving ADC0809 interrupt request singal, makes A/D Converter can be with single-chip microcomputer proper communication.A, B, C mouth that P2.4, P2.5, P2.6 meet ADC0809 are used for selecting that to be changed to lead to Road；P2.0 selects input as 8253 chip slappers, to control 8253 to bring into operation.P2.1, P2.2 meet A0, A1 of 8253 chips Mouthful, for the working method of control counter.P3.3 (INT1) be used for receive 8253 interrupt request singal, control counter with The normal communication of single-chip microcomputer；GND is grounded, and VSS connects+5V power supplys.

As shown in Fig. 6 Fig. 7, Fig. 6 is IGBT buffer circuits, and Fig. 7 is pwm converter circuit.The dc source of pwm converter Generally there is AC network to be produced by uncontrollable commutation diode, and using bulky capacitor filtering, to obtain constant DC voltage. But because capacitance is very big, equivalent to short circuit when suddenly switched on power supply, it will produce very big charging current, be easily damaged Component in circuit, so again with delay after the one big resistance that to be connected between rectifier and filter capacitor, power turn-on Switch is by the resistive short, in order to avoid cause unnecessary loss the design current-limiting resistance to take 1K, a switch in parallel in operation.By Transient current can be very big in circuit, for the sake of security, and switch takes relay adhesive, is controlled with the P3.4 mouths of single-chip microcomputer Relay works.Power device overcurrent caused when opening and turning off is different with over-voltage condition, open-minded in power device When, electric current rises rapidly, and di/dt is very big；When power device is turned off, du/dt rises rapidly, and very high overvoltage occurs.If To consider these two aspects factor during meter buffer circuit.Current-rising-rate can be suppressed by series inductance by opening buffer circuit Di/dt, but because inductance volume ratio is larger, generally IGBT turn-on consumptions can be subject to by improving raster data model condition Control, so IGBT buffer circuit function is more focused on the absorption and suppression of overvoltage in turn off process.In order that power device Overvoltage is effectively suppressed and reduces turn-off power loss when part is turned off, and the design turns off RC buffer circuits using discrete.RC Buffer circuit is mainly used in element with small capacity, such as Fig. 3-5, when IGBT is opened, and buffer circuit electric capacity C will be put by R to IGBT Electricity, accelerates the electric current i rates of climb；When IGBT is turned off, load current is shunted by R to C, alleviates IGBT burden, suppression Du/dt and overvoltage are made.The IGBT following parameter of selection Main Basiss in the design：On-state average current I_Ta, off-state repeat Crest voltage U_URMAnd repetitive peak reverse voltage U_RRM.Wherein：

I_Ta=(1.5--2) K_fbI_d (3-4)

U_URM=U_RRM=(2--3) U_m (3-5)

In formula：K_fb--- on-state average current design factor, 0.368 is equal under the conditions of three-phase bridge rectification；

I_d--- direct current generator rated current；

U_m--- maximum peak voltage.

After being calculated through above formula, I is selected_Ta=10A, U_URM=U_RRM=1200V IGBT.The capacitance-resistance experience in parallel with IGCT Data are：Electric capacity takes 0.1 μ F, the Ω of resistance 100.

As shown in figure 8, Fig. 8, which is current signal, gathers change-over circuit LA25-NP Hall-type DC current sensors.It is inputted Maximum current range is 25A, and the corresponding two secondary sides output currents of 25A are 25mA；Electric current is between primary side loop and secondary loop It is insulation.LA25-NP Hall-types DC current sensor has higher precision and the good linearity, antijamming capability By force.DC bus current is flowed into from LA25A-NP I+ pins, and two secondary side electric currents are exported by M pins.The voltage signal collected 0~5V magnitude of voltage is enlarged into through ratio amplifier LM345, enters ADC0809 A/D inputs, export and connect 5.1V voltage-stabiliser tubes with Protect ADC0809 A/D input ports.Output signal connects ADC0809 IN-1 ports.

As shown in figure 9, rate signal detects circuit interconnect pattern, the low and high level of photoelectric encoder output connects 74LS136 cores Piece carries out two frequency-doubled signal processing, exports tachometer pulse.Then the CLK ends of d type flip flop 4013 are connected to.8253 0 passage, 1 lead to Road counter is respectively to m₁And m₂Counted, d type flip flop is used for making m₂Counting and tachometer pulse count synchronization, by d type flip flop Output Q connect 8253 GATE1, control m₂Count pulse.Because 8253 be that trailing edge is counted, therefore pulse signal is passed through Reverser 74LS04 is connected to 8253 GATE0 ends.Because Singlechip clock frequency is 12MHz, ALE pins have the work of six frequency dividings With, so ALE pins output frequency is 2MHz, and the high frequency clock frequency needed is 2MHz, so can directly by ALE pins and 8253 CLK1 is connected, to survey m₂High-frequency impulse is provided.Start tachometer signal to AT89C52 single-chip microcomputers carry out software programming to P2.0 mouthfuls of output chips select control signal, start 8253.Sending signal control d type flip flop work by 8155H PC0 ports again makes m₁ And m₂Synchronous counting, No. 0 of 8253 and No. 1 counter occupation mode 2 work.This side is initialized into by mcu programming After formula, counting process can be monitored with GATE level.When 8155H PC0 ports export high level, send startup and test the speed letter Number, that is, D is put for high level, and tachometer pulse counter is started counting up up to PC0 mouthfuls export low level from initial value immediately, that is, is sent Stop tachometer signal, force counting process to stop.So start point from testing the speed in halt time interval, GATE0 is high electricity Flat, then the tachometer pulse count value for inputting 8253 CLK0 ports is m₁.The GATE1 of clock counter is exported with d type flip flop Q ends connect, after P2.0 mouthfuls, which export high level, starts to test the speed, to wait subsequent first to input tachometer pulse rising edge and enter The trigger pulse CP ends of d type flip flop, Q is just changed into high level, and hereafter 2MHZ clock pulses is started counting up.It is same to work as PC0 mouthfuls of outputs Low level stops testing the speed, and clock pulses will just stop counting when next pulse, now the count value m of clock₂It is just whole m₁ The time interval of individual tachometer pulse.

As shown in Figure 10, it is pwm signal generation circuit, in transistor power amplification and power circuit, pulse width is adjusted Device (IGBT) processed is widely used with its low in energy consumption, efficiency high.The PWM modulator that analog circuit is constituted is generally by triangle Ripple (or sawtooth waveforms) generator and comparator composition, this circuit are applied to the occasion that control signal is analog signal.As used PWM modulator is simulated, then needs that digital quantity is converted into analog quantity by D/A converter, could connect with this modulator, no But it is inconvenient, and typically also need to carry out zero point adjustment.Then according to control system the characteristics of, a kind of digital P WM is devised Modulator, can directly be connected, circuit is simple with computer export mouthful, make easy, with low cost, without adjustment, fit very much Close microcomputer control occasion.The PWM modulator working frequency, can zero output and fully loaded output up to 100KHZ.When input, 82 are entered D during code processed, the pwm signal that should be produced, PWM pulse period is 256 clock cycles, then high level width should For d, low level width should be 256-d, i.e. dutycycle for d/256*100%, it is contemplated that input as 82 carry system codes, Ji Hunan With with the time-base oscillation circuit realiration of general simple flip-flops or 555 1 classes.It is contemplated that using digital circuit：Counter (or it is fixed When device), trigger and a small amount of auxiliary circuit realize.The reference pulse cp of one higher than PWM frequency 256 times of input, counts to cp, D pulse is counted, high level is exported within d cp cycle, (256-d) individual pulse is then counted, the low electricity in (256-d) cp cycles is exported It is flat.Counter be 8 can preset up/down counter, carry out subtracting countings when being output as high level, count after d pulse, counter Count value is 0, output borrow signal RCO, overturn trigger, and make simultaneously counter default value be d, trigger (low level is output as after overturning), and counter does plus counted, in (256-d) individual rear counter under trigger control Count value is 255, output RCO carry signal, RCO signal promote trigger level to be again transformed into height, and make counting again D is set to, so as to carry out the counting of next round.8 digit counters by 24 it is two-way can preset count 74191 cascade and form, low level RCO signal it is defeated to high-order CLK signal end, as asynchronous connection.High-order RCO signal be the total RCO of circuit signal be connected to meter Number devices put several end LOAD, RCO be after signal inversion trigger clock signal, pass through a d type flip flop 4013, Q ends That is pwm signal positive output Q+, Q are PWM complementary output Q-, then 4013 Q and Q meet two high speed photo coupling TLP521- respectively 1 output.

As shown in figure 11, PWM drive circuit figure, IR2110 built-in functions are made up of three parts：Logic is inputted；Level translation And output protection.The characteristics of IR2110 as described above, many convenience can be brought for the design of device.Especially high-end suspension is certainly The design of power supply is lifted, it is that the control to upper and lower side can be achieved that can greatly reduce group power supply of the number of driving power supply, i.e., one.Simultaneously Because IR2110 output voltage is 10V~20V, admittedly driving IGBT work can be used directly to.IR2110 uses in the system+ 15V power voltage supplies, ground signalling is power earth signal.Two high speed photo coupling TLP521-1 output signal connects IR2110's respectively HIN and LIN ends are used as input signal.When HIN is high level, HO output positive voltage signals, by bootstrap capacitor C7 by voltage It is added between Q2 grid and emitter stage, C7 is discharged by the metal-oxide-semiconductor formation loop of chip internal, and at this moment C7 is equivalent to one Voltage source, so that Q2 is turned on.Because LIN and HIN are a pair of complementary input signals, so now LIN is low level, at this moment gather The electric charge collected in Q4 grids and emitter stage is discharged rapidly over the ground in chip internal by resistance, because dead time influence makes Q2 exist Q4 rapid shut-offs before opening.When HIN is low level, the electric charge being gathered between Q2 grids and emitter stage is logical in chip internal Crossing resistance, electric discharge turns off Q2 rapidly.It is high level by of short duration dead time LIN, VCC is by internal resistance and Q4 grid Pole and source electrode formation loop, make Q4 open-minded.VCC fills through bootstrap diode, C8 and Q4 formation loop to C8 at the same time Electricity, supplements energy for C8 rapidly.

As shown in figure 12, the interface circuit of 8155H and single-chip microcomputer, in circuit connection, the P1.0-P1.7 of single-chip microcomputer connects 8 position datawires of 8155H chips, P3.0 controls 8155H IO/M mouths.P3.1 is used as the chip selection signal of 8155H chips, controls it Gate work.

Matrix keyboard as shown in figure 13, using 8279 chips as common interface circuit, on the one hand receives from keyboard Input data is simultaneously pre-processed, and on the other hand realizes management and the control of logarithmic code display to display data, so that real Now to the automatically scanning of keypad/display, and recognize on keyboard close key key number, can not only greatly save CPU to keyboard/ The operating time of display, so that offloading the CPU, and display is stable, and program is simple, is not in maloperation.8279 It at most can be used to control 16 light-emitting diode displays, when figure place showing is more than 8, be required to be set as that 16 characters are shown.And With the function of eliminating shake.For keyboard Designing, the system may make up the matrix form key of 16 keys using 4 × 4 row-column configurations The function of disk, wherein button is respectively 0~9 numeral and " " button, " starting setting ", " confirmation ", " DEL ", " AC/ON " " multiple Position ".Matrix keyboard is called determinant keyboard.Row-column structure is constituted with I/O mouth lines, button is arranged on the intersection point of ranks. When number of keys is more, I/O mouth lines can be saved.

As shown in figure 14, keyboard-display circuit wiring diagram, is decoded by 74LS154 and exported, and display is arrived after being driven through 7407 LED each common cathode.Output line OUTB0-OUTB3, OUTA0-OUTA3 are defeated as 8 section code selection data Exit port, the content of each numeral method of control light-emitting diode display, when switching from a LED charactron to next bit, by Blanking output line BD exports low level, and 74LS154 decodings produce low level, 74LS138 outputs is all high level.Now, 8 Bit field data output port exports the display content that next LED shows position.74LS138 decoding circulations produce low level, 8 sections Data-out port also respectively shows common cathode for the display content in the display position of low level bit successively, when this When process is shown quickly, people will see the different content shown in several LED.Connecting the letter within 32 keys During singly-bound disk, CNTL, SHIFT input can be grounded.74LS07 chips are 8279 defeated as the section code selection of LED numeral method devices The driven in phase chip of exit port.

As shown in figure 15, voltage-stabilized power supply circuit flow chart, the voltage-stabilized power supply of this secondary design is whole by power transformer, diode Current circuit, four parts of filter circuit and mu balanced circuit are constituted.The design of voltage-stabilized power supply, is the output voltage according to voltage-stabilized power supply The requirement of the performance indications such as Uo, output current Io, output ripple voltage Δ U, correctly determines transformer, integrated regulator, whole The performance parameter of component used in diode and filter circuit is flowed, so as to reasonably select these devices.The skill of voltage-stabilized power supply Art index is divided into two kinds：One kind is characteristic index, includes input voltage, output voltage, output current and the output voltage of permission Adjustable range etc.；Another is quality index, for weighing the degree of stability of output DC voltage, including regulation factor, output Resistance, temperature coefficient and ripple voltage etc..

As shown in Figure 16 and Figure 17, respectively Power Management Design circuit diagram ,+15V power supplys and Power Groud power circuit.

Above-described embodiment is only to illustrate technical concepts and features of the present utility model, and its object is to allow be familiar with technique People can understand content of the present utility model and implement according to this, protection domain of the present utility model can not be limited with this.It is all The modification done according to the Spirit Essence of the utility model main technical schemes, should all cover in protection domain of the present utility model Within.

Claims (9)

1. a kind of SCM Based intelligent material control device, it is characterised in that：Connect including Master control chip and respectively with it The weight signal collecting unit connect and direct current motor system control unit；The weight signal collecting unit includes what is be sequentially connected Weight signal Acquisition Circuit, signal filtering amplifying circuit and A/D change-over circuits, are respectively used to gather weight of material, and will collection Signal is amplified again by sending Master control chip to after analog-to-digital conversion；The direct current motor system control unit is examined including electric current Slowdown monitoring circuit, Rotating speed measring circuit and PWM control modules, are respectively used to detect the electric current and rotary speed information of direct current motor system, and Master control chip is sent to, Master control chip controls the operation of direct current motor system by PWM control modules.

2. SCM Based intelligent material control device according to claim 1, it is characterised in that：Described main control Chip uses AT89C52 single-chip microcomputers.

3. SCM Based intelligent material control device according to claim 2, it is characterised in that：The weight signal Acquisition Circuit uses resistance strain sensor semibridge system measuring circuit.

4. SCM Based intelligent material control device according to claim 2, it is characterised in that：The filter and amplification Circuit is amplified using AD620 chips to the weight signal detected.

5. SCM Based intelligent material control device according to claim 4, it is characterised in that：The A/D conversions Circuit is converted to data signal using 8 A/D converter ADC0809 by obtained analog signal is amplified by AD620.

6. SCM Based intelligent material control device according to claim 1, it is characterised in that：The PWM controls Module, as buffer circuit, obtains constant DC voltage using IGBT.

7. SCM Based intelligent material control device according to claim 1, it is characterised in that：Described direct current The current detection circuit of machine system uses LA25A-NP Hall-type DC current sensors, and DC bus current is from LA25A-NP's I+ pins are flowed into, and two secondary side electric currents are exported by M pins, and the voltage signal collected is enlarged into 0~5V's through ratio amplifier LM345 Magnitude of voltage, enters ADC0809 A/D inputs, exports and connects 5.1V voltage-stabiliser tubes to protect ADC0809 A/D input ports, output Signal connects ADC0809 IN-1 ports.

8. SCM Based intelligent material control device according to claim 7, it is characterised in that：Described rotating speed inspection Slowdown monitoring circuit, speed probe, the tachometer pulse that photoelectric encoder is produced are used as using the photoelectric encoder of the line of raster count N=1024 Frequency has fixed proportionate relationship with motor speed, using M/T method speed measurement treatments.

9. SCM Based intelligent material control device according to claim 1, it is characterised in that：Described main control Chip is also associated with Key and display circuit, using 8155H as I/O extended chips, and system keyboard and aobvious is used as using 8279 Show device interface chip；The keyboard constitutes the matrix keyboard of 16 keys using 4 × 4 row-column configurations；Display circuit using 4 lines- 16 line decoder 74LS154 and LED digital display tubes.