CN109781058A - Strain gauge load cell simulator - Google Patents
Strain gauge load cell simulator Download PDFInfo
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- CN109781058A CN109781058A CN201910069740.3A CN201910069740A CN109781058A CN 109781058 A CN109781058 A CN 109781058A CN 201910069740 A CN201910069740 A CN 201910069740A CN 109781058 A CN109781058 A CN 109781058A
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Abstract
The present invention provides a kind of strain gauge load cell simulators, it is characterized in that, including sensor simulator unit circuit interface (1), reversal connection and overvoltage crowbar (2), voltage-stabilized power supply circuit (3), D/A circuit reference voltage resistor voltage divider network (4), reference voltage switching circuit (5), output divider resistance network (6), output divider resistance switching circuit (7), range switch (8), PWM sub-circuit (9), A/D circuit resistor voltage divider network (10), single-chip microcontroller (11), D/A converter (12), user program memory EEPROM (13), temperature sensor (14), liquid crystal display (15), communication interface circuit (16), it operates keyboard (17).The present invention substitutes mechanical switch with electronic switch, eliminates the variation of the contact resistance of mechanical switch contact oxidation or pollution generation, improves the long-time stability of simulator.
Description
Technical field
The present invention relates to circuit design fields, more particularly to strain gauge load cell simulator.
Background technique
The invention patent is on the basis of patent " high accuracy strain gauge load cell simulator ZL03245772.3 " into one
Step development.Simulator will adapt to a variety of different measuring instrumentss for connecting and using with sensor, these instrument supply sensor
Driving voltage is also different.When the transducer excitation voltage variation range of input simulator is excessive, the reference electricity of DAC
At this moment pressure can need to switch different potential-divider networks with switching circuit, be maintained at the reference voltage of DAC beyond the range allowed
Within the scope of suitable, while the output bleeder circuit different with switching, make the ratio of output voltage and driving voltage (i.e.
The output valve of sensor) it remains unchanged.
Traditional way is with the potential-divider network for having the switching of contact different.When the oxidation of switching switch contact or pollution
Contact resistance will be unstable afterwards, changes resistor network intrinsic standoff ratio, and the output signal of simulator will generate error.
Summary of the invention
For the defects in the prior art, the object of the present invention is to provide a kind of strain gauge load cell simulators.
A kind of strain gauge load cell simulator provided according to the present invention, including sensor simulator unit circuit interface, reversal connection and
Overvoltage crowbar, voltage-stabilized power supply circuit, D/A circuit reference voltage resistor voltage divider network, reference voltage switching circuit, output point
Piezoresistance network, output divider resistance switching circuit, range switch, PWM sub-circuit, A/D circuit resistor voltage divider network,
Single-chip microcontroller, D/A converter, user program memory EEPROM, liquid crystal display, communication interface circuit, operation keyboard；
The sensor simulator unit circuit interface is connected with tested instrument, and the transducer excitation voltage for being tested instrument input is logical
It crosses sensor simulator unit circuit interface and is separately connected reversal connection and overvoltage crowbar, A/D circuit resistor voltage divider network, D/A circuit
The input of the output end connection voltage-stabilized power supply circuit of the input terminal of reference voltage resistor voltage divider network, reversal connection and overvoltage crowbar
End, voltage-stabilized power supply circuit (3) provide power supply；The adc circuit of the output end connection single-chip microcontroller of A/D circuit resistor voltage divider network draws
Foot, for measuring the transducer excitation voltage value of tested instrument output；The intrinsic standoff ratio of D/A circuit reference voltage resistor voltage divider network
It is selected by reference to voltage commutation circuit, the output end of D/A circuit reference voltage resistor voltage divider network is separately connected D/A conversion
The input terminal of device, PWM sub-circuit, D/A converter, PWM sub-circuit output end be separately connected output divider resistance network
Input terminal, the D/A converter, PWM sub-circuit connect single-chip microcontroller, D/A converter by single-chip microcontroller instruction output and ginseng
The directly proportional voltage value of voltage is examined to output divider resistance network, the intrinsic standoff ratio of output divider resistance network passes through output partial pressure electricity
Switching circuit control is hindered, the voltage and single-chip microcontroller exported after output divider resistance network partial pressure controls the output of PWM sub-circuit
The output voltage signal that sensor simulator unit circuit interface formation sensor is output to after voltage superposition is sent to the letter of tested instrument
Number input terminal；
The reference voltage switching circuit, output divider resistance switching circuit are separately connected range switch, by amount
Journey selects switch control, and range switch connects single-chip microcontroller and oneself state is input to single-chip microcontroller；
The single-chip microcontroller is separately connected user program memory EEPROM, liquid crystal display, communication interface circuit, operation key
Disk；User program memory EEPROM can save user program program, and liquid crystal display can show simulator working condition,
Communication interface circuit can input user program and sensor simulator unit control instruction, and user passes through operation keyboard operation sensor
Simulator work.
It preferably, further include temperature sensor, the temperature sensor connects single-chip microcontroller, and single-chip microcontroller surveys temperature sensor
The circuit board temperature measured exports after compensating.
Preferably, the maximum output voltage of the PWM sub-circuit is that the minimum of D/A converter differentiates voltage.
Preferably, the sensor simulator unit circuit interface 1 includes connector J1, filter C1, filter C2, filter
C3, filter C4, the reversal connection and overvoltage crowbar include self-recovery fuse F1, TVS pipe D1, the voltage-stabilized power supply circuit
Including voltage-stablizer U1, resistance R16, resistance R18, capacitor C7, capacitor C8, the D/A circuit reference voltage resistor voltage divider network packet
Precision resistance network RM1 is included, the reference voltage switching circuit includes MOSFET pipe Q2, and the output divider resistance network includes
Precision resistance R3, precision resistance R10, precision resistance network RM2, precision resistance network RM3, the output divider resistance switching electricity
Road includes MOSFET pipe Q3, MOSFET pipe Q4, resistance R34, resistance R35, zener diode D8, and the range switch includes
K1A, K1B, the PWM sub-circuit include MOSFET pipe Q1, resistance R1, resistance R2, resistance R4, resistance R5, resistance R6, resistance
R8, capacitor C17, the A/D circuit resistor voltage divider network include resistance R12, resistance R13.
Preferably, MOSFET pipe Q1, MOSFET pipe Q2, MOSFET pipe Q3, MOSFET pipe Q4 uses AO3400, D/A
Converter uses AD5060, and single-chip microcontroller uses PIC18F1320, and temperature sensor uses TC77, user program memory EEPROM
TPS71501 is used using 24C512, voltage-stablizer U1.
Compared with prior art, the present invention have it is following the utility model has the advantages that
1, the present invention substitutes mechanical switch with electronic switch, eliminates the contact of mechanical switch contact oxidation or pollution generation
The variation of resistance improves the long-time stability of simulator.
2, present invention voltage-stabiliser tube guarantees that MOSFET pipe (field-effect tube) has enough cut-in voltages and do not exceed
The gate source voltage limit value of the permission of MOSFET pipe.
3, in bleeder circuit of the present invention with a fixed resistance and the fixed resistance and another resistance that can be disconnected simultaneously
Join the switching between two states, instead of switching between the resistances, reduces what the variation of MOSFET pipe conducting resistance generated
It influences.
4, the present invention combines the property that simulator is improved to improve the resolution ratio of DAC circuit with DAC circuit with pwm circuit
Energy.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is the principle of the present invention block diagram.
Fig. 2 is electrical schematic diagram of the invention.
It is shown in figure:
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, several changes and improvements can also be made.These belong to the present invention
Protection scope.
The present invention relates to a kind of simulated strain sensor export as defined in standard signal, for detecting or calibrated meter and control
A kind of equipment of system processed.The output signal of strain transducer is multiplied with the driving voltage of the input quantity of sensor and sensor
Product is directly proportional.
A kind of strain gauge load cell simulator provided according to the present invention, as shown in Figure 1, including that sensor simulator unit circuit connects
Mouth 1, reversal connection and overvoltage crowbar 2, voltage-stabilized power supply circuit 3, D/A circuit reference voltage resistor voltage divider network 4, reference voltage are cut
Change circuit 5, output divider resistance network 6, output divider resistance switching circuit 7, range switch 8, PWM sub-circuit 9, A/
D circuit resistor voltage divider network 10, single-chip microcontroller 11, D/A converter 12, user program memory EEPROM13, liquid crystal display 15,
Communication interface circuit 16, operation keyboard 17；
The sensor simulator unit circuit interface 1 is connected with tested instrument, is tested the transducer excitation voltage of instrument input
Reversal connection and overvoltage crowbar 2, A/D circuit resistor voltage divider network 10, D/ are separately connected by sensor simulator unit circuit interface 1
The output end connection regulated power supply electricity of the input terminal of A circuit reference voltage resistor voltage divider network 4, reversal connection and overvoltage crowbar 2
The input terminal on road 3, voltage-stabilized power supply circuit 3 provide power supply；The output end connection single-chip microcontroller 11 of A/D circuit resistor voltage divider network 10
Adc circuit pin, for measuring the transducer excitation voltage value of tested instrument output；D/A circuit reference voltage voltage-splitter resistance net
The intrinsic standoff ratio of network 4 is selected by reference to voltage commutation circuit 5, the output end difference of D/A circuit reference voltage resistor voltage divider network 4
Connect D/A converter 12, PWM sub-circuit 9 input terminal, D/A converter 12, PWM sub-circuit 9 output end be separately connected
The input terminal of output divider resistance network 6, the D/A converter 12, PWM sub-circuit 9 connect single-chip microcontroller 11, D/A converter
12 export the voltage value directly proportional to reference voltage to output divider resistance network 6, output partial pressure electricity by the instruction of single-chip microcontroller 11
The intrinsic standoff ratio for hindering network 6 is controlled by output divider resistance switching circuit 7, the electricity that output divider resistance network 6 exports after dividing
The formation of sensor simulator unit circuit interface 1 is output to after the voltage superposition that pressure is exported with the control PWM sub-circuit 9 of single-chip microcontroller 11 to pass
The output voltage signal of sensor is sent to the signal input part of tested instrument；
The reference voltage switching circuit 5, output divider resistance switching circuit 7 are separately connected range switch 8, by
Range switch 8 controls, and range switch 8 connects single-chip microcontroller 11 and oneself state is input to single-chip microcontroller 11；
The single-chip microcontroller 11 is separately connected user program memory EEPROM13, liquid crystal display 15, communication interface circuit
16, keyboard 17 is operated；User program memory EEPROM13 can save user program program, and liquid crystal display 15 can be shown
Simulator working condition, communication interface circuit 16 can input user program and sensor simulator unit control instruction, and user passes through
It operates keyboard 17 and operates sensor simulator unit work.It further include temperature sensor 14, the temperature sensor 14 connects single-chip microcontroller
11, single-chip microcontroller 11 measures after obtained circuit board temperature compensates temperature sensor 14 and exports.
The maximum output voltage of the PWM sub-circuit 9 is that the minimum of D/A converter 12 differentiates voltage.Therefore D/A conversion
The combination of device 12 and PWM sub-circuit 9 improves the resolution ratio of simulator.Utilize the D/A device of sixteen bit and four PWM electricity
Road work in combination can reach 20 resolution ratio.
As shown in Fig. 2, the sensor simulator unit circuit interface 1 includes connector J1, filter C1, filter C2, filter
Wave device C3, filter C4, the reversal connection and overvoltage crowbar 2 include self-recovery fuse F1, TVS pipe D1, the pressure stabilizing electricity
Source circuit 3 includes voltage-stablizer U1, resistance R16, resistance R18, capacitor C7, capacitor C8, the D/A circuit reference voltage divider resistance
Network 4 includes precision resistance network RM1, and the reference voltage switching circuit 5 includes MOSFET pipe Q2, the output divider resistance
Network 6 includes precision resistance R3, precision resistance R10, precision resistance network RM2, precision resistance network RM3, the output partial pressure
Resistance switching circuit 7 includes MOSFET pipe Q3, MOSFET pipe Q4, resistance R34, resistance R35, zener diode D8, the range
Selecting switch 8 includes K1A, K1B, and the PWM sub-circuit 9 includes MOSFET pipe Q1, resistance R1, resistance R2, resistance R4, resistance
R5, resistance R6, resistance R8, capacitor C17, the A/D circuit resistor voltage divider network 10 include resistance R12, resistance R13.Range choosing
Selecting switch 8 is K1A, K1B, and when switch is at 5-10V grades, the grid source of Q2, Q3, Q4 are shorted, and Q2, Q3, Q4 are turned off；Work as switch
At 10-20V grades, Q2, Q3, Q4 are both turned on, the precision resistance network RM1's in D/A circuit reference voltage resistor voltage divider network 4
2-3 foot resistance and 2-4 foot resistor coupled in parallel, 1-3 foot resistance in precision resistance network RM2 in output divider resistance network 6 and
1-4 foot resistor coupled in parallel, 1-3 foot resistance in precision resistance network RM3 and 1-4 foot resistance in output divider resistance network 6 are simultaneously
Connection, thus changes the intrinsic standoff ratio of D/A circuit reference voltage resistor voltage divider network 4 and output divider resistance network 6.Single-chip microcontroller 11
For U5, D/A converter 12 be U4, user program memory EEPROM 13 is U3, temperature sensor 14 is U2.
MOSFET pipe Q1, MOSFET pipe Q2, MOSFET pipe Q3, MOSFET pipe Q4 uses AO3400, D/A converter 12
Using AD5060, single-chip microcontroller 11 uses PIC18F1320, and temperature sensor 14 uses TC77, user program memory EEPROM13
TPS71501 is used using 24C512, voltage-stablizer U1.
Preferably, sensor simulator unit circuit interface 1 is similar with the mode of connection of various strain transducers, the biography of input
Sensor driving voltage supplies each electrical component to voltage-stabilized power supply circuit 3 through reversal connection and overvoltage crowbar 2, divides through A/D circuit
Resistor network 10 arrives the adc circuit pin of single-chip microcontroller 11, for measuring the driving voltage value of interface input；Through D/A circuit reference
Voltage resistor network 4 is sent to the reference voltage input pin and PWM sub-circuit 9 of D/A converter 12 after dividing.D/A electricity
Road reference voltage resistor voltage divider network 4 selects intrinsic standoff ratio by reference voltage switching circuit 5, makes the reference voltage of D/A converter 12
Within the scope of being maintained at suitable.D/A converter 12 is in the instruction output of single-chip microcontroller 11 given ratio and reference voltage at just
The voltage value of ratio, the voltage are sent into output divider resistance network 6, and output divider resistance network 6 switches electricity by output divider resistance
Road 7 controls intrinsic standoff ratio, and the output voltage after partial pressure is superimposed with the output voltage values for the PWM sub-circuit 9 that single-chip microcontroller 11 controls
After be output to sensor simulator unit circuit interface 1, form the output voltage signal of sensor.Reference voltage switching circuit 5 and defeated
Divider resistance switching circuit 7 is by the control of range switch 8 out, while the state of range control switch 8 also enters into list
Piece machine 11.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make a variety of changes or modify within the scope of the claims, this not shadow
Ring substantive content of the invention.In the absence of conflict, the feature in embodiments herein and embodiment can any phase
Mutually combination.
Claims (5)
1. a kind of strain gauge load cell simulator, which is characterized in that including sensor simulator unit circuit interface (1), reversal connection and over-voltage
Protect circuit (2), voltage-stabilized power supply circuit (3), D/A circuit reference voltage resistor voltage divider network (4), reference voltage switching circuit
(5), output divider resistance network (6), output divider resistance switching circuit (7), range switch (8), PWM sub-circuit
(9), A/D circuit resistor voltage divider network (10), single-chip microcontroller (11), D/A converter (12), user program memory EEPROM
(13), liquid crystal display (15), communication interface circuit (16), operation keyboard (17)；
The sensor simulator unit circuit interface (1) is connected with tested instrument, and the transducer excitation voltage for being tested instrument input is logical
It crosses sensor simulator unit circuit interface (1) and is separately connected reversal connection and overvoltage crowbar (2), A/D circuit resistor voltage divider network
(10), the output end connection of the input terminal of D/A circuit reference voltage resistor voltage divider network (4), reversal connection and overvoltage crowbar (2)
The input terminal of voltage-stabilized power supply circuit (3), voltage-stabilized power supply circuit (3) provide power supply；The output of A/D circuit resistor voltage divider network (10)
The adc circuit pin of end connection single-chip microcontroller (11), for measuring the transducer excitation voltage value of tested instrument output；D/A circuit
The intrinsic standoff ratio of reference voltage resistor voltage divider network (4) is selected by reference to voltage commutation circuit (5), D/A circuit reference voltage point
The output end of piezoresistance network (4) is separately connected the input terminal of D/A converter (12), PWM sub-circuit (9), D/A converter
(12), the output end of PWM sub-circuit (9) is separately connected the input terminal of output divider resistance network (6), the D/A converter
(12), PWM sub-circuit (9) connection single-chip microcontroller (11), instruction output and reference electricity of the D/A converter (12) by single-chip microcontroller (11)
The voltage value of direct ratio is pressed into output divider resistance network (6), the intrinsic standoff ratio of output divider resistance network (6) is by exporting partial pressure
Resistance switching circuit (7) control, the voltage and single-chip microcontroller (11) control PWM that output divider resistance network (6) exports after dividing are thin
The output voltage letter that sensor simulator unit circuit interface (1) forms sensor is output to after the voltage superposition of parallel circuit (9) output
Number it is sent to the signal input part of tested instrument；
The reference voltage switching circuit (5), output divider resistance switching circuit (7) are separately connected range switch (8),
It is controlled by range switch (8), range switch (8) connects single-chip microcontroller (11) and oneself state is input to single-chip microcontroller
(11)；
The single-chip microcontroller (11) is separately connected user program memory EEPROM (13), liquid crystal display (15), communication interface electricity
Road (16), operation keyboard (17)；User program memory EEPROM (13) can save user program program, liquid crystal display
(15) simulator working condition can be shown, communication interface circuit (16) can input user program and sensor simulator unit control
Instruction, user operate sensor simulator unit work by operation keyboard (17).
2. strain gauge load cell simulator according to claim 1, which is characterized in that further include temperature sensor (14), institute
Temperature sensor (14) connection single-chip microcontroller (11) is stated, single-chip microcontroller (11) measures temperature sensor (14) obtained circuit board temperature
It is exported after compensating.
3. strain gauge load cell simulator according to claim 1, which is characterized in that the maximum of the PWM sub-circuit (9)
Output voltage is that the minimum of D/A converter (12) differentiates voltage.
4. strain gauge load cell simulator according to claim 1, which is characterized in that the sensor simulator unit circuit interface
It (1) include connector J1, filter C1, filter C2, filter C3, filter C4, the reversal connection and overvoltage crowbar (2)
Including self-recovery fuse F1, TVS pipe D1, the voltage-stabilized power supply circuit (3) includes voltage-stablizer U1, resistance R16, resistance R18, electricity
Hold C7, capacitor C8, the D/A circuit reference voltage resistor voltage divider network (4) includes precision resistance network RM1, described with reference to electricity
Pressing switching circuit (5) includes MOSFET pipe Q2, and the output divider resistance network (6) includes precision resistance R3, precision resistance
R10, precision resistance network RM2, precision resistance network RM3, the output divider resistance switching circuit (7) include MOSFET pipe
Q3, MOSFET pipe Q4, resistance R34, resistance R35, zener diode D8, the range switch (8) includes K1A, K1B, institute
Stating PWM sub-circuit (9) includes MOSFET pipe Q1, resistance R1, resistance R2, resistance R4, resistance R5, resistance R6, resistance R8, capacitor
C17, the A/D circuit resistor voltage divider network (10) include resistance R12, resistance R13.
5. strain gauge load cell simulator according to claim 2 or 4, which is characterized in that described MOSFET pipe Q1, MOSFET
Pipe Q2, MOSFET pipe Q3, MOSFET pipe Q4 uses AO3400, and D/A converter (12) uses AD5060, and single-chip microcontroller (11) uses
PIC18F1320, temperature sensor (14) use TC77, user program memory EEPROM (13) to use 24C512, voltage-stablizer U1
Using TPS71501.
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| CN201910069740.3A CN109781058B (en) | 2019-01-24 | 2019-01-24 | Strain sensor simulator |
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| CN201910069740.3A CN109781058B (en) | 2019-01-24 | 2019-01-24 | Strain sensor simulator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112212908A (en) * | 2020-10-10 | 2021-01-12 | 北京航空航天大学 | Intelligent sensor and intelligent method thereof |
| CN114858050A (en) * | 2022-04-08 | 2022-08-05 | 四川天利科技有限责任公司 | Dynamic strain actual measurement verification method and device of engine rotating member remote measurement system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112212908A (en) * | 2020-10-10 | 2021-01-12 | 北京航空航天大学 | Intelligent sensor and intelligent method thereof |
| CN114858050A (en) * | 2022-04-08 | 2022-08-05 | 四川天利科技有限责任公司 | Dynamic strain actual measurement verification method and device of engine rotating member remote measurement system |
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