CN107084750A - A kind of real-time dynamic weight signal processing circuit module - Google Patents
A kind of real-time dynamic weight signal processing circuit module Download PDFInfo
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- CN107084750A CN107084750A CN201710392366.1A CN201710392366A CN107084750A CN 107084750 A CN107084750 A CN 107084750A CN 201710392366 A CN201710392366 A CN 201710392366A CN 107084750 A CN107084750 A CN 107084750A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G23/00—Auxiliary devices for weighing apparatus
- G01G23/01—Testing or calibrating of weighing apparatus
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C19/00—Electric signal transmission systems
- G08C19/02—Electric signal transmission systems in which the signal transmitted is magnitude of current or voltage
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Abstract
The invention discloses a kind of real-time dynamic weight signal processing circuit module.Including electric power management circuit, signal amplification circuit, signal filter circuit, Voltage-current conversion circuit and transducer excitation voltage circuit；Wherein electric power management circuit is connected with signal amplification circuit, signal filter circuit, Voltage-current conversion circuit and transducer excitation voltage circuit is powered respectively, and signal amplification circuit, signal filter circuit, Voltage-current conversion circuit are sequentially connected with and as the path of sensor dynamic weight signal.The present invention can amplify original dynamic weight signal, eliminate disturbing load signal, and voltage signal is converted into current signal, and the cut-off frequency of LPF is adjustable in the range of 3~300Hz, can be suitably used for the weight object of different weight equipment and different qualities.
Description
Technical field
The present invention relates to a kind of signal processing circuit module, a kind of real-time dynamic of industry spot is more particularly to applied to
Weight signal processing circuit module.
Background technology
Dynamic weight measuring technology is widely used in industry spot Product checking and sorting link.Usual weight sensing
Device is installed in some fixed position of conveyer belt, when measured object passes through the position, sensor output weight signal.In dynamic
In conveyer belt system, when product arrived weight sensor, due to requiring the speed of product dynamic weight metering, product weight
The time of amount loading on a sensor is very short (within hundreds of milliseconds).Shaken additionally, due to the machinery in conveyer belt running
The influence of the disturbing factors such as dynamic, product rolling vibration, real product weight can be submerged among various interference loads, to dynamic
State weight realizes that high-acruracy survey causes very big difficulty.Therefore under extraneous Random Excitation, how exclusive PCR load, it is accurate
Really measurement measured object actual weight, is the technological difficulties and key point of dynamic weight test system.
At present, the main voltage signal conditioning circuit using industrial general of industry spot dynamic realtime weight signal conditioning come
Realize that signal amplification, filtering and pressure circulation such as change at the function.But it is due to that dynamic weight signal has retention time short change fast
Feature, in the difference plus dynamic weight equipment and weight object, existing signal processing circuit module is difficult to meet dynamic weight
Measure the response of weight of equipment signal fast, the big demand of operating mode difference, it is impossible to realize high-precision dynamic weight.
Develop with the demand of product market and industry spot, in the urgent need to one kind is applied widely, dynamic property is good
Signal processing circuit module.
The content of the invention
In order to solve above-mentioned technical problem present in prior art, it is an object of the invention to provide a kind of real-time dynamic
Weight signal processing circuit module, can be used in the signal transacting of dynamic weight equipment, and dynamic weight signal is nursed one's health, and
And filter cutoff frequency is adjustable, the problem of industry spot dynamic weight precision is low is solved.
To achieve these goals, the technical solution adopted by the present invention is as follows：
The present invention includes electric power management circuit, signal amplification circuit, signal filter circuit, Voltage-current conversion circuit and sensing
Device driving voltage circuit；Wherein electric power management circuit respectively with signal amplification circuit, signal filter circuit, Voltage-current conversion circuit
It is connected with transducer excitation voltage circuit and is powered, signal amplification circuit, signal filter circuit, Voltage-current conversion circuit is suitable
It is secondary to connect and be used as the path of sensor dynamic weight signal.
Dynamic weight signal is input to signal amplification circuit amplification, is then input to signal filter circuit filtering, last defeated
Enter to Voltage-current conversion circuit and be converted into the weight signal after the conditioning of electric current, transducer excitation voltage circuit connection sensor is used
To drive sensor.
The electric power management circuit includes power interface CON1, electric capacity C1~C14, resistance R1, diode D1, light-emitting diodes
Pipe D2,24V turn ± 15V power transfer modules U1 and voltage stabilizing chip U2~U5, and circuit meets+24V through power interface CON1 and powered,
Diode D1 anode connects+24V positive sources, and through tantalum electric capacity C1, with simulating (AGND's diode D1 negative electrode) is connected, two poles
Pipe D1 negative electrode is connected with the 24V input VIN pin for turning ± 15V power transfer modules U1, and diode D1 negative electrode is through resistance R1
With light emitting diode D2 with connecing simulation again (AGND)；24V turns ± 15V power transfer modules U1 power output end-VO and+VO pin
Output -15V and+15V power supplys respectively, and respectively by electric capacity C3, C4 and electric capacity C5, C6 in parallel with connecing simulation (AGND)；
Voltage stabilizing chip U2 input Vin pin connect+15V power supplys, and output end vo ut pin output ﹢ 12V power supplys, output end vo ut pin pass through simultaneously
The electric capacity C7 and C8 of connection are with connecing simulation (AGND)；+ 12V the power supplys of voltage stabilizing chip U2 outputs connect voltage stabilizing chip U4 5,7,8 pin, surely
The pressure chip U4 pin of output end 1 and 2 pin is connected and exports 5V power supplys, and connects simulation ground by electric capacity C11 and C12 in parallel
(AGND), while voltage stabilizing chip U4 1 pin and 2 pin are connected to 3 pin by electric capacity C2, voltage stabilizing chip U4 4 pin connect simulation ground
(AGND)；Voltage stabilizing chip U3 input Vin pin connect -15V power supplys, voltage stabilizing chip U3 output end vo ut pin output -12V power supplys
And by electric capacity C9 and C10 in parallel with connecing simulation (AGND)；Voltage stabilizing chip U5 input Vin pin connect -12V power supplys, U5's
Output end vo ut pin output -5V power supplys and by parallel electric capacity C13 and C14 with connecing simulation (AGND).
Described signal amplification circuit includes interface CON2 and interface CON3, operational amplifier chip U6 and U7, potentiometer
VR1 and VR2, resistance R2~R6 and electric capacity C15~C22, original dynamic weight signal access circuit, interface by interface CON2
CON2 two pin are connected with operational amplifier chip the U6 pin of input 5 and 4 pin respectively；Operational amplifier chip U6 2 pin
Resistance R2, potentiometer VR1 is sequentially passed through with 15 pin of itself to be connected；Operational amplifier chip U6 10 pin connect simulation ground
(AGND), the operational amplifier chip U6 pin of power pins 13 and 7 pin meets+12V and -12V power supplys respectively, and respectively through parallel connection
Electric capacity C15, C16 and electric capacity C17, C18 connect simulation (AGND)；Operational amplifier chip U6 11 pin and 12 pin are connected,
And be connected by resistance R5 with the operational amplifier chip U7 pin of reverse input end 2, operational amplifier chip U7 3 pin are by electricity
With connecing simulation (AGND), operational amplifier chip U7 7 pin and 4 pin meet+12V and -12V power supplys to resistance R6 respectively, and respectively through
Shunt capacitance C19, C20 and C21, C22 are with connecing simulation (AGND)；Resistance R3 one end is connected with potentiometer VR2 public pin,
Potentiometer VR2 two ends with connecting simulation respectively (AGND) and+5V power supplys, the resistance R3 other end and operational amplifier chip U7's
2 pin are connected, and operational amplifier chip U7 2 pin are connected by resistance R4 with 6 pin of itself, operational amplifier chip U7 6 pin
As the output pin of signal amplification circuit, by the signal after the output amplification that is connected with interface CON3, output signal is connected to
Signal filter circuit.
Described signal filter circuit includes interface CON4, low pass filter chip U8, resistance R7 and R8 and electric capacity C23
~C27, interface CON4 two ends respectively with low pass filter chip U8 Fout pin and simulation (AGND) be connected, LPF
Device chip U8 CLKR pin, VCC- pin, AGND pin and VCC+ pin is power pins, and wherein LS pin and VCC pin connects -5V power supplys and passed through
Cross electric capacity C24 and C25 in parallel with connecing simulation (AGND), VCC+ pin connect+5V power supplys and connect by electric capacity C26 and C27 in parallel
Simulation ground (AGND), AGND pin are with connecing simulation (AGND)；Bandpass filter chip U8 CLKIN pin are connect digitally by electric capacity C23
(DGND), and by resistance R8 and potentiometer VR3 and itself CLKR pin connect, simulation ground (AGND) and digitally (DGND) it
Between be connected by resistance R7, low pass filter chip U8 Fin pin fetch the output signal from signal amplification circuit, through too low
Filtered signal is exported in Fout pin and exported by interface CON4 after pass filter processing.
Described Voltage-current conversion circuit include interface CON5, pressure stream conversion chip U9, triode Q1, FET Q2,
Resistance R9~R18 and electric capacity C28~C31, pressure stream conversion chip U9 VSP pin and GND pin are power pins, VSP pin connect+
24V power supplys simultaneously pass through electric capacity C30 and C31 in parallel with connecing simulation (AGND), and GND pin are with connecing simulation (AGND)；Core is changed in pressure circulation
Piece U9 VIN pin be signal input part, by pull down resistor R18 connect simulation (AGND), while with resistance R16 and resistance R17
One end be connected, the resistance R16 and resistance R17 other end is fetched respectively to be changed from the output signal of signal filter circuit and pressure circulation
The reference voltage of chip U9 itself REGF pin；Pressure stream conversion chip U9 SET pin pass sequentially through resistance R13 and resistance R14 connects mould
Plan ground (AGND), pressure stream conversion chip U9 REGS pin with connecing simulation (AGND), press stream conversion chip U9's by resistance R11
REGF pin are connected by resistance R12 with the REGS pin of itself, REGF pin by electric capacity C29 connect simulation (AGND)；Pressure circulation is changed
By resistance R10 with connecing simulation (AGND), pressure stream conversion chip U9 PAD pin directly connect simulation ground to chip U9 OD pin
(AGND)；Pressure stream conversion chip U9 IS pin and VG pin connect triode Q1 emitter and collector, triode Q1 hair respectively
Emitter-base bandgap grading is connected by resistance R9 with base stage, and FET Q2 source electrode is connected with triode Q1 base stage, FET Q2 grids
It is connected with triode Q1 colelctor electrode, as current signal output end after FET Q2 drain electrode connecting resistance R15, and passes through electricity
Hold C28 with connecing simulation (AGND), resistance R15 connection interfaces CON5 and output current signal.
Described transducer excitation voltage circuit includes interface CON6, voltage stabilizing chip U10, potentiometer VR4 and VR5, resistance
R19 and electric capacity C32~C35, voltage stabilizing chip U10 GND pin and two IN pin are power pins, 4 pin with connecing simulation (AGND),
Two IN pin meet+12V and pass through electric capacity C34 and C35 in parallel with connecing simulation (AGND)；Voltage stabilizing chip U10 two OUT pin phases
Potentiometer VR4 and potentiometer VR5 common port, single-pole double-throw switch (SPDT) S1 two fixed termination potentiometer VR4 are connect after even respectively
With potentiometer VR5 one end, single-pole double-throw switch (SPDT) S1 movable end by resistance R19 with connecing simulation (AGND)；Voltage stabilizing chip U10
ADJ pin by resistance R19 with connecing simulation (AGND), potentiometer VR4 and VR5 common port output transducer driving voltage simultaneously connects
Interface CON6, and, interface CON6 1 pin is with connecing simulation (AGND) by electric capacity C32 and C33 in parallel with connecing simulation (AGND).
It is preferred that, described 24V turns ± 15V power transfer modules U1 and uses model HDN3-24S05A1, and described is steady
Chip U2 is pressed to use model L7912CV, described voltage stabilizing core using model LM2940CT-12, described voltage stabilizing chip U3
Piece U4 uses model L7905CV using model ADP3303, described voltage stabilizing chip U5.
It is preferred that, described operational amplifier chip U6 is adopted using model INA114, the operational amplifier chip U7
Use model OP177.
It is preferred that, described filter chip U8 uses model TLC14C.
It is preferred that, described filter chip U9 uses model XTR111.
It is preferred that, described filter chip U10 uses model LT1965.
The invention has the advantages that：
1. it can be converted to strong antijamming capability by faint dynamic weight voltage signal after amplification, filtering, be adapted to existing
The current signal of field long-distance transmissions；
2. low pass filter cutoff frequency is adjustable, it can be incited somebody to action according to weight device type, line speed, plant characteristic of weighing
Wave filter is adjusted to suitable cut-off frequency；
3. the signal conditioning circuit linearity is good, long-term work drift is low；
4. pass through electromagnetic compatibility and antistatic design, stable work in work.
Brief description of the drawings
Fig. 1 is the general structure block diagram of the present invention.
Fig. 2 is the circuit structure diagram of electric power management circuit of the present invention.
Fig. 3 is the circuit structure diagram of signal amplification circuit of the present invention.
Fig. 4 is the circuit structure diagram of signal filter circuit of the present invention.
Fig. 5 is the circuit structure diagram of Voltage-current conversion circuit of the present invention.
Fig. 6 is the circuit structure diagram of inventive sensor driving voltage circuit.
Fig. 7 is linearity test chart of the present invention.
Fig. 8 is long-term working stability test chart of the present invention.
In figure：Electric power management circuit 1, signal amplification circuit 2, signal filter circuit 3, Voltage-current conversion circuit 4, sensor
Driving voltage circuit 5.
Embodiment
Below in conjunction with drawings and examples, the present invention is further described.
As shown in figure 1, the present invention module include electric power management circuit 1, signal amplification circuit 2, signal filter circuit 3,
Voltage-current conversion circuit 4 and transducer excitation voltage circuit 5；Wherein electric power management circuit 1 respectively with signal amplification circuit 2, letter
Number filter circuit 3, Voltage-current conversion circuit 4 are connected with transducer excitation voltage circuit 5 and are powered, signal amplification circuit 2,
Signal filter circuit 3, Voltage-current conversion circuit 4 are sequentially connected with and as the path of sensor dynamic weight signal.
As shown in Fig. 2 electric power management circuit 1 include power interface CON1, electric capacity C1~C14, resistance R1, diode D1,
Light emitting diode D2,24V turns ± 15V power transfer modules U1 and voltage stabilizing chip U2~U5, and circuit connect through power interface CON1+
24V powers, and diode D1 anode connects+24V positive sources, and diode D1 negative electrode is connected through tantalum electric capacity C1 with simulation, and two
Pole pipe D1 negative electrode is connected with the 24V input VIN pin for turning ± 15V power transfer modules U1, and diode D1 negative electrode is through resistance
R1 and light emitting diode D2 connect simulation ground again；24V turns ± 15V power transfer modules U1 power output end-VO and+VO pin difference
Output -15V and+15V power supplys, and simulation ground is connect by electric capacity C3, C4 and electric capacity C5, C6 in parallel respectively；Voltage stabilizing chip U2
Input Vin pin connect+15V power supplys, output end vo ut pin output ﹢ 12V power supplys, output end vo ut pin pass through electric capacity C7 in parallel
Simulation ground is connect with C8；+ 12V the power supplys of voltage stabilizing chip U2 outputs connect voltage stabilizing chip U4 5,7,8 pin, voltage stabilizing chip U4 output end
1 pin and 2 pin are connected and export 5V power supplys, and connect simulation ground by electric capacity C11 and C12 in parallel, while the 1 of voltage stabilizing chip U4
Pin and 2 pin are connected to 3 pin by electric capacity C2, and voltage stabilizing chip U4 4 pin connect simulation ground；Voltage stabilizing chip U3 input Vin pin connect-
15V power supplys, voltage stabilizing chip U3 output end vo ut pin output -12V power supplys simultaneously connect simulation ground by electric capacity C9 and C10 in parallel；
Voltage stabilizing chip U5 input Vin pin connect -12V power supplys, and U5 output end vo ut pin output -5V power supplys simultaneously pass through electric capacity in parallel
C13 and C14 connect simulation ground.
As shown in figure 3, signal amplification circuit 2 includes interface CON2 and interface CON3, operational amplifier chip U6 and U7, electricity
Position device VR1 and VR2, resistance R2~R6 and electric capacity C15~C22, original dynamic weight signal access circuit by interface CON2, connect
Mouth CON2 two pin are connected with operational amplifier chip the U6 pin of input 5 and 4 pin respectively；The 2 of operational amplifier chip U6
Pin sequentially passes through resistance R2, potentiometer VR1 and is connected with 15 pin of itself；Operational amplifier chip U6 10 pin connect simulation ground, fortune
The pin of power pins 13 and 7 pin for calculating amplifier chip U6 meet+12V and -12V power supplys respectively, and respectively through electric capacity in parallel
C15, C16 and electric capacity C17, C18 connect simulation ground.Operational amplifier chip U6 11 pin and 12 pin are connected, and by resistance R5
It is connected with the operational amplifier chip U7 pin of reverse input end 2, operational amplifier chip U7 3 pin connect simulation by resistance R6
Ground, operational amplifier chip U7 7 pin and 4 pin meet+12V and -12V power supplys respectively, and respectively through shunt capacitance C19, C20 with
And C21, C22 connect simulation ground；Resistance R3 one end is connected with potentiometer VR2 public pin, and potentiometer VR2 two ends connect mould respectively
Intend ground and+5V power supplys, the resistance R3 other end is connected with operational amplifier chip U7 2 pin, operational amplifier chip U7 2 pin
It is connected by resistance R4 with 6 pin of itself, operational amplifier chip U7 6 pin pass through as the output pin of signal amplification circuit
It is connected with interface CON3 and exports the signal after amplification, output signal is connected to signal filter circuit 3.
As shown in figure 4, signal filter circuit 3 includes interface CON4, low pass filter chip U8, resistance R7 and R8 and electricity
Hold C23~C27, interface CON4 two ends are connected with low pass filter chip U8 Fout pin and simulation respectively, LPF
Device chip U8 CLKR pin, VCC- pin, AGND pin and VCC+ pin is power pins, and wherein LS pin and VCC pin connects -5V power supplys and passed through
The electric capacity C24 and C25 for crossing parallel connection connect simulation ground, and VCC+ pin connect+5V power supplys and connect simulation ground by electric capacity C26 and C27 in parallel,
AGND pin connect simulation ground；Bandpass filter chip U8 CLKIN pin meet digitally DGND by electric capacity C23, and by resistance R8 and
Potentiometer VR3 and the CLKR pin of itself are connected, and simulation ground and are digitally connected by resistance R7 between DGND, low pass filter
Chip U8 Fin pin fetch the output signal from signal amplification circuit 2, export and filter in Fout pin after low-pass filtering treatment
Rear signal is simultaneously exported by interface CON4.
As shown in figure 5, Voltage-current conversion circuit 4 includes interface CON5, pressure stream conversion chip U9, triode Q1, field-effect
Pipe Q2, resistance R9~R18 and electric capacity C28~C31, pressure stream conversion chip U9 VSP pin and GND pin are power pins, VSP pin
Connect+24V power supplys and connect simulation ground by electric capacity C30 and C31 in parallel, GND pin connect simulation ground；Pressure stream conversion chip U9 VIN
Pin is signal input part, and simulation ground is connect by pull down resistor R18, while be connected with resistance R16 and resistance R17 one end, resistance
R16 and resistance the R17 other end fetch the output signal and pressure stream conversion chip U9 itself REGF from signal filter circuit 3 respectively
The reference voltage of pin；Pressure stream conversion chip U9 SET pin pass sequentially through resistance R13 and resistance R14 and connect simulation ground, and core is changed in pressure circulation
Piece U9 REGS pin connect simulation ground by resistance R11, and pressure stream conversion chip U9 REGF pin pass through resistance R12 and the REGS of itself
Pin is connected, and REGF pin connect simulation ground by electric capacity C29；Pressure stream conversion chip U9 OD pin connect simulation ground, pressure stream by resistance R10
Conversion chip U9 PAD pin directly connect simulation ground；Pressure stream conversion chip U9 IS pin and VG pin connect triode Q1 transmitting respectively
Pole and colelctor electrode, triode Q1 emitter stage are connected by resistance R9 with base stage, FET Q2 source electrode and triode Q1's
Base stage is connected, and FET Q2 grids are connected with triode Q1 colelctor electrode, conduct after FET Q2 drain electrode connecting resistance R15
Current signal output end, and simulation ground is connect by electric capacity C28, resistance R15 connection interfaces CON5 simultaneously exports the 4- for being adapted to industry transmission
20mA current signals.
As shown in fig. 6, transducer excitation voltage circuit 5 include interface CON6, voltage stabilizing chip U10, potentiometer VR4 and VR5,
Resistance R19 and electric capacity C32~C35, voltage stabilizing chip U10 GND pin and two IN pin are power pins, and 4 pin connect simulation ground, two
Individual IN pin meet+12V and connect simulation ground by electric capacity C34 and C35 in parallel；Voltage stabilizing chip U10 two OUT pin are distinguished after being connected
Connect potentiometer VR4 and potentiometer VR5 common port, single-pole double-throw switch (SPDT) S1 two fixed termination potentiometer VR4 and potentiometer
VR5 one end, single-pole double-throw switch (SPDT) S1 movable end connects simulation ground by resistance R19；Voltage stabilizing chip U10 ADJ pin pass through electricity
Resistance R19 connects simulation ground, potentiometer VR4 and VR5 common port output transducer driving voltage and connection interface CON6, and passes through in parallel
Electric capacity C32 and C33 connect simulation ground, interface CON6 1 pin connects simulation ground.
The course of work of the present invention is as follows：
In the dynamic weight equipment course of work, due to the mechanical oscillation in conveyer belt running, product rolling vibration
Deng the influence of disturbing factor, the original weight signal of weight sensor output is also adjoint in addition to comprising real product weight
Various interference load signals.
After the power line of weight sensor and signal wire AM access module, the driving voltage of weight sensor is by sensor excitation
Potential circuit 5 is provided, and user can select sensor to swash according to the type and the weight of weight object of sensor by switching S1
Encourage voltage (5V or 10V outputs).
After dynamic weight equipment is started working, the original weight signal from weight sensor first passes through module by signal amplification
The signal of mV ranks is amplified to V grades by circuit 2, and user can be realized by potentiometer VR1 (to be increased to the gain-adjusted of amplified signal
Beneficial scope be 25~1000), signal is amplified to suitable voltage magnitude；Zero point electricity to signal is realized by potentiometer VR2
Position regulation.
Signal amplification circuit is while actual products weight signal is amplified, and interference signal is also exaggerated；After amplification
Signal filters out interference signal by signal filter circuit 3, and user can be according to weight signal characteristic, by adjusting potentiometer
VR3 sets low pass filter cutoff frequency (cut-off frequency scope is 3~300Hz), and disturbing signal is eliminated to greatest extent and is protected
Stay weight signal；Eliminate interference after voltage signal reach Voltage-current conversion circuit (4, by voltage signal be converted to be adapted to industry
The 4-20mA current signals of on-site transfer, to strengthen the antijamming capability in transmitting procedure.
Weight current signal can be carried out by industrial control unit (ICU)s such as the medium such as twisted-pair feeder long-distance transmissions to single-chip microcomputer, PLC
Calculating is handled, and obtains product weight.
In specific implementation, 24V turns ± 15V power transfer modules U1 and uses model HDN3-24S05A1, voltage stabilizing chip U2
Model L7912CV, voltage stabilizing chip U4 is used to use model using model LM2940CT-12, voltage stabilizing chip U3
ADP3303, voltage stabilizing chip U5 use model L7905CV；Operational amplifier chip U6 uses model INA114, operation amplifier
Device chip U7 uses model OP177；Filter chip U8 uses model TLC14C, filter chip U9 to use model
XTR111, filter chip U10 use model LT1965.
Low pass filter chip U8 cut-off frequencies in signal filter circuit 3 are adjustable in the range of 3~300Hz, specific real
Applying can be adjusted wave filter to suitable cut-off frequency according to weight device type, line speed, weight plant characteristic.
With reference to Fig. 7, Fig. 7 is the linearity test result of above example.Under conveyer belt running status, by multiplication factor
Regulation is adjusted the cut-off frequency of wave filter to 50Hz to 2000 times, respectively with quality be 10 grams, 20 grams, 30 grams, 50 grams and
100 grams of standard test weight records output current as load of weighing.Linear fit is carried out to obtained scatterplot, the goodness of fit reaches
To 0.9999.Test result indicates that, the present invention has the good linearity in the dynamic case.
With reference to Fig. 8, the long-time stability and temperature drift test result of Fig. 8 above example.In conveyer belt running status
Under, multiplication factor is adjusted to 2000 times, the cut-off frequency of wave filter is adjusted to 50Hz, the current signal that module is exported is connect
Enter controller, obtain dynamic weighing result.One piece of weight is used to be weighed load as experiment for 51.5 grams of egg, it is small every 6
50 experiments of weighing of Shi Jinhang, record weighing results and calculate average value.Duration test in 84 hours is carried out continuously, weighing results exist
Fluctuated above and below actual weight, deviation range is less than ± 0.5 gram.Test result indicates that, long-term working stability of the present invention is good, claims
Weight result is affected by temperature small.
As can be seen here, low pass filter cutoff frequency of the invention is adjustable in the range of 3~300Hz, can meet dynamic weight
Measure the response of weight of equipment signal fast, faint original dynamic weight signal can be amplified, pass through low pass by the big demand of operating mode difference
Filter circuit filters out disturbing load signal, and voltage signal is converted into the 4-20mA current signals that suitable industry spot is transmitted,
Improve the measuring accuracy of dynamic weight equipment.
The upper only presently preferred embodiments of the present invention, is not intended to limit the invention, all spirit in the present invention
With any modifications, equivalent substitutions and improvements made within principle etc., it should be included in the scope of the protection.
Claims (3)
1. a kind of real-time dynamic weight signal processing circuit module, it is characterised in that：Put including electric power management circuit (1), signal
Big circuit (2), signal filter circuit (3), Voltage-current conversion circuit (4) and transducer excitation voltage circuit (5)；Wherein power supply pipe
Manage circuit (1) respectively with signal amplification circuit (2), signal filter circuit (3), Voltage-current conversion circuit (4) and sensor excitation
Potential circuit (5), which is connected, to be powered, and signal amplification circuit (2), signal filter circuit (3), Voltage-current conversion circuit (4) are suitable
It is secondary to connect and be used as the path of sensor dynamic weight signal.
2. a kind of dynamic realtime weight signal processing circuit module according to claim 1, it is characterised in that：The power supply
Manage circuit (1) include power interface CON1, electric capacity C1~C14, resistance R1, diode D1, light emitting diode D2,24V turn ±
15V power transfer modules U1 and voltage stabilizing chip U2~U5, circuit meets+24V through power interface CON1 and powered, diode D1 sun
Pole connects+24V positive sources, and diode D1 negative electrode is connected through tantalum electric capacity C1 with simulation, and diode D1 negative electrode and 24V turn ±
15V power transfer modules U1 input VIN pin are connected, and diode D1 negative electrode connects mould again through resistance R1 and light emitting diode D2
Intend ground；Power output end-VO and+the VO pin that 24V turns ± 15V power transfer modules U1 export -15V and+15V power supplys respectively, and
Simulation ground is connect by electric capacity C3, C4 and electric capacity C5, C6 in parallel respectively；Voltage stabilizing chip U2 input Vin pin connect+15V electricity
Source, output end vo ut pin output ﹢ 12V power supplys, output end vo ut pin connect simulation ground by electric capacity C7 and C8 in parallel；Voltage stabilizing chip
+ 12V the power supplys of U2 outputs connect voltage stabilizing chip U4 5,7,8 pin, and voltage stabilizing chip the U4 pin of output end 1 and 2 pin are connected and exported
5V power supplys, and simulation ground is connect by electric capacity C11 and C12 in parallel, while voltage stabilizing chip U4 1 pin and 2 pin are connected by electric capacity C2
3 pin are connected to, voltage stabilizing chip U4 4 pin connect simulation ground；Voltage stabilizing chip U3 input Vin pin connect -15V power supplys, voltage stabilizing chip U3
Output end vo ut pin output -12V power supplys and simulation ground is connect by parallel electric capacity C9 and C10；Voltage stabilizing chip U5 input
Vin pin connect -12V power supplys, and U5 output end vo ut pin output -5V power supplys simultaneously connect simulation ground by electric capacity C13 and C14 in parallel；
Described signal amplification circuit (2) includes interface CON2 and interface CON3, operational amplifier chip U6 and U7, potentiometer
VR1 and VR2, resistance R2~R6 and electric capacity C15~C22, dynamic weight signal access circuit, the two of interface CON2 by interface CON2
Individual pin is connected with operational amplifier chip the U6 pin of input 5 and 4 pin respectively；Operational amplifier chip U6 2 pin are sequentially passed through
Resistance R2, potentiometer VR1 are connected with 15 pin of itself；Operational amplifier chip U6 10 pin connect simulation ground, operational amplifier core
The piece U6 pin of power pins 13 and 7 pin meets+12V and -12V power supplys respectively, and respectively through electric capacity C15, C16 and electricity in parallel
Hold C17, C18 and connect simulation ground；
Operational amplifier chip U6 11 pin and 12 pin are connected, and by resistance R5 and operational amplifier chip U7 reverse input
2 pin are held to be connected, operational amplifier chip U7 3 pin connect simulation ground, operational amplifier chip U7 7 pin and 4 pin by resistance R6
+ 12V and -12V power supplys are met respectively, and connect simulation ground respectively through shunt capacitance C19, C20 and C21, C22；The one of resistance R3
End be connected with potentiometer VR2 public pin, potentiometer VR2 two ends connect respectively simulate with+5V power supplys, the resistance R3 other end
It is connected with operational amplifier chip U7 2 pin, operational amplifier chip U7 2 pin are connected by resistance R4 with 6 pin of itself, transports
Amplifier chip U7 6 pin are calculated as the output pin of signal amplification circuit, pass through the letter after the output amplification that is connected with interface CON3
Number, output signal is connected to signal filter circuit (3)；
Described signal filter circuit (3) includes interface CON4, low pass filter chip U8, resistance R7 and R8 and electric capacity C23
~C27, interface CON4 two ends are connected with low pass filter chip U8 Fout pin and simulation respectively, low pass filter chip
U8 CLKR pin, VCC- pin, AGND pin and VCC+ pin is power pins, and wherein LS pin and VCC pin connect -5V power supplys and by parallel
Electric capacity C24 and C25 connect simulation ground, VCC+ pin connect+5V power supplys and connect simulation ground, AGND pin by parallel electric capacity C26 and C27
Connect simulation ground；Bandpass filter chip U8 CLKIN pin are connect digitally by electric capacity C23, and by resistance R8 and potentiometer VR3 and
Itself CLKR pin connection, simulation ground and digitally between be connected by resistance R7, low pass filter chip U8 Fin pin connect
Output signal from signal amplification circuit (2), exports filtered signal in Fout pin after low-pass filtering treatment and leads to
Cross interface CON4 outputs；
Described Voltage-current conversion circuit (4) includes interface CON5, pressure stream conversion chip U9, triode Q1, FET Q2, electricity
R9~R18 and electric capacity C28~C31 is hindered, pressure stream conversion chip U9 VSP pin and GND pin are power pins, and VSP pin meet+24V
Power supply simultaneously connects simulation ground by electric capacity C30 and C31 in parallel, and GND pin connect simulation ground；Pressure stream conversion chip U9 VIN pin are letter
Number input, simulation ground is connect by pull down resistor R18, while be connected with resistance R16 and resistance R17 one end, resistance R16 and electricity
The resistance R17 other end is fetched from the output signal and pressure of signal filter circuit (3) respectively flows conversion chip U9 itself REGF pin
Reference voltage；Pressure stream conversion chip U9 SET pin pass sequentially through resistance R13 and resistance R14 and connect simulation ground, pressure stream conversion chip U9
REGS pin simulation ground is connect by resistance R11, pressure stream conversion chip U9 REGF pin pass through resistance R12 and the REGS pin phases of itself
Even, REGF pin connect simulation ground by electric capacity C29；Pressure stream conversion chip U9 OD pin connect simulation ground by resistance R10, and pressure circulation is changed
Chip U9 PAD pin directly connect simulation ground；Pressure stream conversion chip U9 IS pin and VG pin connect respectively triode Q1 emitter stage and
Colelctor electrode, triode Q1 emitter stage is connected by resistance R9 with base stage, FET Q2 source electrode and triode Q1 base stage
It is connected, FET Q2 grids are connected with triode Q1 colelctor electrode, and electric current is used as after FET Q2 drain electrode connecting resistance R15
Signal output part, and simulation ground, resistance R15 connection interfaces CON5 and output current signal are connect by electric capacity C28.
3. a kind of dynamic realtime weight signal processing circuit module according to claim 1, it is characterised in that：Described biography
Sensor driving voltage circuit (5) includes interface CON6, voltage stabilizing chip U10, potentiometer VR4 and VR5, resistance R19 and electric capacity C32
~C35, voltage stabilizing chip U10 GND pin and two IN pin are power pins, and 4 pin connect simulation ground, and two IN pin meet+12V and passed through
Electric capacity C34 and C35 in parallel connects simulation ground；Voltage stabilizing chip U10 two OUT pin connect potentiometer VR4 and current potential respectively after being connected
Device VR5 common port, single-pole double-throw switch (SPDT) S1 two fixed termination potentiometer VR4 and potentiometer VR5 one end, single-pole double throw
The movable end for switching S1 connects simulation ground by resistance R19；Voltage stabilizing chip U10 ADJ pin connect simulation ground, current potential by resistance R19
Device VR4 and VR5 common port output transducer driving voltage and connection interface CON6, and connect mould by electric capacity C32 and C33 in parallel
Intend ground.
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| CN201710392366.1A CN107084750A (en) | 2017-05-27 | 2017-05-27 | A kind of real-time dynamic weight signal processing circuit module |
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| CN112330947A (en) * | 2020-11-20 | 2021-02-05 | 浙江大学 | Secondary water supply pump house data acquisition circuit based on STM32 singlechip |
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Application publication date: 20170822 |