CN106525267A - Bus type temperature measuring device - Google Patents
Bus type temperature measuring device Download PDFInfo
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- CN106525267A CN106525267A CN201611170744.3A CN201611170744A CN106525267A CN 106525267 A CN106525267 A CN 106525267A CN 201611170744 A CN201611170744 A CN 201611170744A CN 106525267 A CN106525267 A CN 106525267A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
- G01K7/20—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer in a specially-adapted circuit, e.g. bridge circuit
- G01K7/21—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer in a specially-adapted circuit, e.g. bridge circuit for modifying the output characteristic, e.g. linearising
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
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- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses a bus type temperature measuring device which is characterized in that the device comprises a power supply module, a temperature measurement and conversion module, a control module, and a bus communication module. The power module is used for supplying power to the device. The temperature measurement and conversion module and the bus communication module are connected to the control module. The temperature measurement and conversion module obtains a temperature signal and outputs the temperature signal to the control module. The control module receives the temperature signal, calculates a corresponding temperature value, and outputs the temperature value to the communication module. According to the bus type temperature measuring device of the invention, the sensitivity and precision of temperature measurement are high.
Description
Technical field
The present invention relates to technical field of temperature measurement, specifically a kind of bus-type temperature measuring equipment.
Background technology
Bus-type temperature survey is mainly used in measuring pipeline temperature of liquid, due to various dry in existing temperature sensor
Disturb, cause temperature survey change-over circuit measurement to there is precision and be greatly reduced, Linear Quasi is right low, measured temperature fluctuation is big etc. asks
Topic.
The content of the invention
For overcoming the shortcomings of that above-mentioned prior art is present, it is an object of the invention to provide a kind of sensitivity is high, high precision
Bus-type temperature measuring equipment
The technical solution adopted for the present invention to solve the technical problems is：A kind of bus-type temperature measuring equipment, its feature
It is：Including power module, temperature survey modular converter, control module and bus communication module, the power module is supplied for device
Electricity, the temperature survey modular converter and bus communication module are all connected with the control module；
The temperature-measuring module obtains temperature signal, the temperature signal is exported to control module, the control mould
Block receives the temperature signal, and temperature signal is exported to communication module；
The temperature-measuring module includes voltage reference circuit, voltage follower circuit, temperature sensor U7 and voltage amplification
Circuit, also including the resistance bridge circuit of temperature sensor U7, the voltage reference circuit connects the input of voltage follower circuit,
The resistance bridge circuit of temperature sensor U7 connects the input of voltage amplifier circuit, the voltage follower circuit and voltage amplification electricity
The outfan on road connects the control module.
Preferably, the control module includes single-chip microcomputer U3, and the voltage reference circuit includes fiducial chip U39, output
The reference voltage of 2.5V, the voltage follower circuit include operational amplifier U4A, and 2.5V reference voltages access operational amplifier
The in-phase input end of U4A, the voltage amplifier circuit include operational amplifier U4B, the input jointing temp of operational amplifier U4B
The resistance bridge circuit outfan of sensor U7 connects the ADC collection terminals of single-chip microcomputer U3, and resistance bridge circuit is also connected with operational amplifier U4A
Outfan, the outfan of operational amplifier U4A connects the ADC collection terminals of single-chip microcomputer U3.
Preferably, the power module includes two-stage voltage conversion circuit, and 24V voltages are turned by first order voltage conversion circuit
5V voltages are changed to, 5V voltage conversions are 3.3V by second level voltage conversion circuit；
The first order voltage conversion circuit includes voltage stabilizing chip U44, and the second level voltage conversion circuit includes voltage stabilizing
Chip U26, the first voltage change-over circuit also include resettable fuse F200, one end of the resettable fuse F200
Connection 24V voltages, the other end connect the positive pole of one end of TVS pipe D28 and diode D24, the negative pole difference of diode D24 respectively
One end of connection electric capacity C68, C73 and C93 and 1 pin of voltage stabilizing chip U44,4 pins of voltage stabilizing chip U44 connect electricity respectively
Sense L7, one end of electric capacity C121 simultaneously export 5V voltages, and 2 pins connect the other end of the negative pole of diode D41 and inductance L7 respectively,
The TVS pipe, the other end of electric capacity C68, C73, C93, C121 are grounded, 3, the 5 pins ground connection of voltage stabilizing chip U44, institute
State the plus earth of diode D41；3 pins of voltage stabilizing chip U26 of the second voltage change-over circuit connect 5V voltages respectively
With one end of electric capacity C122, C89, C90,4 pins and 2 pins are connected, and connect one end of electric capacity C72, C91 respectively, and 2 pins are defeated
Go out 3.3V voltages, the other end of electric capacity C122, C89, C90, C72 and C91 is grounded.
Preferably, the voltage reference circuit also includes filter capacitor C98, C102, C103, and the voltage follower circuit is also
Including resistance R16, R17, the resistance bridge circuit of the temperature sensor U7 includes resistance R21, R22, R27 and PT100, the electricity
Pressure amplifying circuit also include resistance R23, R25, R26 and R30, the temperature survey change-over circuit also include resistance R18, R24 and
Electric capacity C13～C15, C18；
1 pin of the fiducial chip U39 connects one end of electric capacity C98 and 3.3V voltages, the other end of electric capacity C98 respectively
Ground connection, 3 pins of fiducial chip U39 connect one end of electric capacity C102, C103 and ground respectively, 2 pins connect respectively electric capacity C102,
One end of the other end and resistance R17 of C103, the in-phase input end of another termination operational amplifier U4A of resistance R17, computing are put
The inverting input of big device U4A connects one end of resistance R16 and electric capacity C13 respectively, and outfan connects resistance R16, electric capacity respectively
One end of the other end and resistance R18 of C13, the other end of resistance R18 connect one end of electric capacity C15 and the 13 of single-chip microcomputer U3 respectively
Pin, the other end ground connection of electric capacity C15, the 4 pins ground connection of operational amplifier U4A, 8 pins connect one end of electric capacity C14 respectively
With 3.3V voltages, the other end ground connection of electric capacity C14；
One end of the resistance temperature sensor PT100 connects one end of resistance R21, R23 respectively, and the other end connects respectively
One end and ground of resistance R27, the other end of resistance R21 connect the output of the other end and operational amplifier U4A of resistance R22 respectively
End, the other end of resistance R22 connect one end of the other end and resistance R25 of resistance R27, the other end difference of resistance R23 respectively
One end of the in-phase input end and resistance R26 of concatenation operation amplifier U4B, the other end ground connection of resistance R26, resistance R25's is another
One end of the in-phase input end and resistance R30 of one end difference concatenation operation amplifier U4B, the outfan point of operational amplifier U4B
Not Lian Jie resistance R30 the other end and one end of resistance R24, the other end of resistance R24 connects one end and the list of electric capacity C18 respectively
14 pins of piece machine U3, the other end ground connection of electric capacity C18.
Preferably, the model of the single-chip microcomputer U3 is STM32F103C8T6, and the control module also includes watchdog circuit
And crystal oscillating circuit, the watchdog circuit includes reset chip U33, model MAX6823,1,4 pins point of reset chip U33
Not Lian Jie single-chip microcomputer U3 7,25 pins, 5 pins of reset chip U33 connect one end of 3.3V voltages and electric capacity C66 respectively, 2
Pin is grounded, the other end ground connection of electric capacity C66；The crystal oscillating circuit includes crystal oscillator Y1, and one end of the crystal oscillator Y1 connects respectively
One end of 5 pins and electric capacity C1 of single-chip microcomputer U3, the other end of crystal oscillator Y1 connect 6 pins and electric capacity C2 of single-chip microcomputer U3 respectively
One end, the other end of electric capacity C1, C2 are grounded；
7 pins of the single-chip microcomputer U3 are also respectively connected with resistance R11, one end of electric capacity C3, the other end connection of resistance R11
3.3V power supplys, electric capacity C3 the other end ground connection, the 1 of single-chip microcomputer U3,24,36,48,9 pins connect 3.3V voltages, 44,20 pins
Connect one end of resistance R3, R5 respectively, the other end of resistance R3, R5 is grounded, the 23 of single-chip microcomputer U3,35,47,8 pins connect
Ground.
Preferably, the bus communication module includes transceiver U9, model SP3485,1,4 pins point of transceiver U9
Not Lian Jie single-chip microcomputer U3 31,30 pins, 2,4 pins of transceiver U9 are connected and distinguish the colelctor electrode and electricity of connecting triode Q2
One end of resistance R100, the other end connection 3.3V voltages of resistance R100, the grounded emitter of audion Q2, base stage connection resistance
One end of R14, the other end of resistance R14 connect 30 pins of single-chip microcomputer U3, and 8 pins of transceiver U9 connect electric capacity C21's respectively
One end and 3.3V voltages, the other end ground connection of electric capacity C21,7 pins of transceiver U9 connect resistance R31, R1 and TVS pipe respectively
One end of D3, D7, the other end ground connection of resistance R31,6 pins of transceiver U9 connect one end of resistance R32, TVS pipe D4 respectively
With the other end of TVS pipe D7, the other end of resistance R1 is connected with 6 pins of transceiver by single-pole single-throw switch (SPST) U2, resistance
R32, TVS pipe D3, the other end of TVS pipe D4 are grounded, and one end of resistance R1 outputs signal to host computer, and the other end passes through hilted broadsword
Single-throw switch U2 outputs signal to host computer.
Preferably, also including display module, the display module is connected with control module, displays temperature value；The display
Module includes group of four figures pipe U5, and model DPY-4CA, the group of four figures pipe are driven by serioparallel exchange chip U6, model
74HC595。
The invention has the beneficial effects as follows：The voltage conversion circuit of the present invention adopts two-stage voltage conversion, can export more steady
Fixed voltage；Single-chip microcomputer U3 gathers the output of two operational amplifiers U4A, U4B simultaneously, can obtain accurate temperature value, can
Effectively to reduce because of ADC Acquisition Errors caused by operational amplifier mains ripple, external factor interference etc., ADC is improve
Acquisition precision and stability；Watchdog circuit is prevented from system and is disturbed deadlock.
Description of the drawings
Fig. 1 is the structural representation of an embodiment of the present invention；
Fig. 2 is the circuit diagram of power module of the present invention；
Fig. 3 is the circuit diagram of temperature-measuring module of the present invention；
Fig. 4 A are the schematic diagrams of the single-chip microcomputer U3 of control module of the present invention；
Fig. 4 B are the circuit diagrams of crystal oscillating circuit described in control module of the present invention；
Fig. 4 C are the circuit diagrams of watchdog circuit described in control module of the present invention；
Fig. 5 is the circuit diagram of bus communication module of the present invention；
Fig. 6 is the schematic diagram of another kind embodiment of the invention；
Fig. 7 is the circuit diagram of display module of the present invention.
Specific embodiment
For can clearly illustrate the technical characterstic of this programme, below by specific embodiment, and its accompanying drawing is combined, to this
It is bright to be described in detail.
As shown in figure 1, a kind of bus-type temperature measuring equipment of the present invention, including power module, temperature survey modulus of conversion
Block, control module and bus communication module, the power module are powered for device, and the temperature survey modular converter and bus are logical
Letter module is all connected with the control module；
The temperature-measuring module obtains temperature signal, the temperature signal is exported to control module, the control mould
Block receives the temperature signal, calculates corresponding temperature value, and the temperature value is exported to communication module；
The temperature-measuring module includes voltage reference circuit, voltage follower circuit, temperature sensor U7 and voltage amplification
Circuit, also including the resistance bridge circuit of temperature sensor U7, the voltage reference circuit connects the input of voltage follower circuit,
The resistance bridge circuit of temperature sensor U7 connects the input of voltage amplifier circuit, the voltage follower circuit and voltage amplification electricity
The outfan on road connects the control module.
As shown in Fig. 2 the power module includes two-stage voltage conversion circuit, first order voltage conversion circuit is electric by 24V
Pressure is converted to 5V voltages, and 5V voltage conversions are 3.3V by second level voltage conversion circuit；
The first order voltage conversion circuit includes voltage stabilizing chip U44, and the second level voltage conversion circuit includes voltage stabilizing
Chip U26, the first voltage change-over circuit also include resettable fuse F200, one end of the resettable fuse F200
Connection 24V voltages, the other end connect the positive pole of one end of TVS pipe D28 and diode D24, the negative pole difference of diode D24 respectively
One end of connection electric capacity C68, C73 and C93 and 1 pin of voltage stabilizing chip U44,4 pins of voltage stabilizing chip U44 connect electricity respectively
Sense L7, one end of electric capacity C121 simultaneously export 5V voltages, and 2 pins connect the other end of the negative pole of diode D41 and inductance L7 respectively,
The TVS pipe, the other end of electric capacity C68, C73, C93, C121 are grounded, 3, the 5 pins ground connection of voltage stabilizing chip U44, institute
State the plus earth of diode D41；3 pins of voltage stabilizing chip U26 of the second voltage change-over circuit connect 5V voltages respectively
With one end of electric capacity C122, C89, C90,4 pins and 2 pins are connected, and connect one end of electric capacity C72, C91 respectively, and 2 pins are defeated
Go out 3.3V voltages, the other end of electric capacity C122, C89, C90, C72 and C91 is grounded.
Preferably, the model of voltage stabilizing chip U44 and U26 is respectively LM2576-5 and AMS1117-3.3, described from extensive
The specification of double insurance silk be R60-090, diode D24, D41 be respectively IN4007, SS43, TVS pipe is SMBJ43CA, inductance L7
For 100mH, the capacitance of electric capacity C73, C90, C91, C122 is respectively 1 μ F, 100nF, 100nF, 100nF, electrochemical capacitor C68,
The specification of C72, C89, C93, C121 is respectively 470 μ F, 100 μ F/16V, 100 μ F/16V, 2200 μ F/35V, 470 μ F/35V.
The reason for using this power supply architecture is：Voltage stabilizing chip U44 belongs to DC-DC power source chip, and the voltage of output has
Than larger ripple, it is unfavorable for the stable collection of system.And voltage stabilizing chip U26 belongs to linear stabilized power supply, power conversion process
The voltage pulsation of middle generation is smaller.The 5V that U44 is exported is changed through U26 again, can just export a more stable 3.3V
Voltage, plays certain filter action, completes the smooth conversion of voltage.Resettable fuse F200 has certain anti-overvoltage input
Effect.Diode D24 can effectively prevent power input reversal connection.
As illustrated in figs. 3 and 4, the temperature survey modular converter includes voltage reference circuit, voltage follower circuit, temperature
Degree sensor U7 and voltage amplifier circuit, also including the resistance bridge circuit of temperature sensor U7, the voltage reference circuit connection
The input of voltage follower circuit, the resistance bridge circuit of temperature sensor U7 connect the input of voltage amplifier circuit, the electricity
The outfan of pressure follow circuit and voltage amplifier circuit connects the ADC collection terminals of single-chip microcomputer U3.
The voltage reference circuit includes fiducial chip U39, and model REF3025 exports the reference voltage of 2.5V, described
Voltage follower circuit includes operational amplifier U4A, and 2.5V reference voltages access the in-phase input end of operational amplifier, the voltage
Amplifying circuit includes operational amplifier U4B, the resistance bridge circuit output of the input jointing temp sensor U7 of operational amplifier U4B
The ADC collection terminals of termination single-chip microcomputer U3, resistance bridge circuit are also connected with the outfan of operational amplifier U4A, operational amplifier U4A's
Outfan connects the ADC collection terminals of single-chip microcomputer U3.
The voltage reference circuit also includes filter capacitor C98, C102, C103, and the voltage follower circuit also includes electricity
Resistance R16, R17, the resistance bridge circuit of the temperature sensor U7 include resistance R21, R22, R27 and PT100, the voltage amplification
Circuit also includes resistance R23, R25, R26 and R30, and the temperature survey change-over circuit also includes resistance R18, R24 and electric capacity C13
～C15, C18；
1 pin of the fiducial chip U39 connects one end of electric capacity C98 and 3.3V voltages, the other end of electric capacity C98 respectively
Ground connection, 3 pins of fiducial chip U39 connect one end of electric capacity C102, C103 and ground respectively, 2 pins connect respectively electric capacity C102,
One end of the other end and resistance R17 of C103, the in-phase input end of another termination operational amplifier U4A of resistance R17, computing are put
The inverting input of big device U4A connects one end of resistance R16 and electric capacity C13 respectively, and outfan connects resistance R16, electric capacity respectively
The other end of one end resistance R18 of the other end and resistance R18 of C13 connects one end of electric capacity C15 and the 13 of single-chip microcomputer U3 respectively
Pin, electric capacity C15 the other end ground connection, operational amplifier 4 pins ground connection, 8 pins connect respectively electric capacity C14 one end and
3.3V voltages, the other end ground connection of electric capacity C14；
One end of the resistance temperature sensor PT100 connects one end of resistance R21, R23 respectively, and the other end connects respectively
One end and ground of resistance R27, the other end of resistance R21 connect the output of the other end and operational amplifier U4A of resistance R22 respectively
End, the other end of resistance R22 connect one end of the other end and resistance R25 of resistance R27, the other end difference of resistance R23 respectively
One end of the in-phase input end and resistance R26 of concatenation operation amplifier U4B, the other end ground connection of resistance R26, resistance R25's is another
One end of the in-phase input end and resistance R30 of one end difference concatenation operation amplifier U4B, the outfan of operational amplifier connect respectively
One end of the other end and resistance R24 of connecting resistance R30, the other end of resistance R24 connect one end and the single-chip microcomputer of electric capacity C18 respectively
14 pins of U3, the other end ground connection of electric capacity C18.
Using operational amplifier U4A, U4B as Switching Core, model is TLV2372 to circuit.Operational amplifier U4A and
The voltage follower circuit of resistance R17, R16 composition, for improving the driving force of the 2.5V voltages of fiducial chip U39 outputs；Fortune
The voltage amplifier circuit of amplifier U4B and resistance R23, R25, R26, R30 composition is calculated, by the resistance bridge circuit of temperature sensor U7
The small-signal of output is amplified.The voltage signal of two operational amplifier outputs, while be connected to single-chip microcomputer U3.Actually make
Used time, the interference for often having various extraneous factors, such as power source supplying voltage fluctuation can affect the stability of operational amplifier.
In the present invention, when supply voltage has fluctuation, two operational amplifier U4A, U4B output valves have certain fluctuation, and the two
Fluctuation interference is basically identical.When single-chip microcomputer U3 gathers the output of two operational amplifiers simultaneously, and calculus of differences is done, can be obtained
Glitch-free difference value, difference value is calculated and is tabled look-up obtains comparing accurately temperature value.Therefore the present invention can be effective
Reduce because of ADC Acquisition Errors caused by operational amplifier mains ripple, improve acquisition precision and the stability of ADC.
Preferably, the resistance value of described resistance R16～R18, R21～R27, R30 be respectively 1K Ω, 1K Ω, 100 Ω,
5.1K Ω, 5.1K Ω, 1K Ω, 100 Ω, 1K Ω, 50K Ω, 50 Ω, 50K Ω, electric capacity C13～C15, C18, C98, C102, C103
Capacitance be respectively 100nF, 100nF, 100nF, 100nF, 104nF, 100nF, 10 μ F, the single-chip microcomputer U3 models
STM32F103C8T6。
As shown in figs. 4 b and 4 c, the control module also includes watchdog circuit and crystal oscillating circuit, the house dog electricity
Road includes reset chip U33, and model MAX6823,1,4 pins of reset chip U33 connect the 7 of single-chip microcomputer U3,25 pipes respectively
Foot, 5 pins of reset chip U33 connect one end of 3.3V voltages and electric capacity C66 respectively, and 2 pins are grounded, and electric capacity C66's is another
End ground connection；The crystal oscillating circuit includes crystal oscillator Y1, and one end of the crystal oscillator Y1 connects 5 pins and electric capacity C1 of single-chip microcomputer U3 respectively
One end, the other end of crystal oscillator Y1 connects one end of 6 pins and electric capacity C2 of single-chip microcomputer U3, the other end of electric capacity C1, C2 respectively
It is grounded；
7 pins of the single-chip microcomputer U3 are also respectively connected with resistance R11, one end of electric capacity C3, the other end connection of resistance R11
3.3V power supplys, electric capacity C3 the other end ground connection, the 1 of single-chip microcomputer U3,24,36,48,9 pins connect 3.3V voltages, 44,20 pins
Connect one end of resistance R3, R5 respectively, the other end of resistance R3, R5 is grounded, the 23 of single-chip microcomputer U3,35,47,8 pins connect
Ground.
Preferably, the resistance value of described resistance R3, R5, R11 is 10K Ω, the capacitance difference of electric capacity C1～C3, C66
For 22pF, 22pF, 100nF, 100nF, crystal oscillator Y1 is 8MHz.
The enabling Canis familiaris L. circuit, can anti-locking system be disturbed deadlock.
As shown in figure 5, the bus communication module includes transceiver U9, model SP3485,1,4 pins of transceiver U9
Connect 31,30 pins of single-chip microcomputer U3 respectively, 2,4 pins of transceiver U9 be connected and distinguish connecting triode Q2 colelctor electrode and
One end of resistance R100, the other end connection 3.3V voltages of resistance R100, the grounded emitter of audion Q2, base stage connection resistance
One end of R14, the other end of resistance R14 connect 30 pins of single-chip microcomputer U3, and 8 pins of transceiver U9 connect electric capacity C21's respectively
One end and 3.3V voltages, the other end ground connection of electric capacity C21,7 pins of transceiver U9 connect resistance R31, R1 and TVS pipe respectively
One end of D3, D7, the other end ground connection of resistance R31,6 pins of transceiver U9 connect one end of resistance R32, TVS pipe D4 respectively
With the other end of TVS pipe D7, the other end of resistance R1 is connected with 6 pins of transceiver by single-pole single-throw switch (SPST) U2, resistance
R32, TVS pipe D3, the other end of TVS pipe D4 are grounded, and one end of resistance R1 outputs signal to host computer, and the other end passes through hilted broadsword
Single-throw switch U2 outputs signal to host computer.
Preferably, the resistance value of described resistance R1, R14, R31, R32, R100 be respectively 120 Ω, 3.3K Ω, 4.7K Ω,
4.7K Ω, 10K Ω, the value of electric capacity C21 is 100nF, and audion Q2 is 8050, and TVS pipe D3, D4, D7 are SMBJ15CA.
As shown in fig. 6-7, the schematic diagram of present invention another kind embodiment, device also include display module, the display mould
Block is connected with control module, displays temperature value；The display module includes group of four figures pipe U5, model DPY-4CA, described four
Digital sum pipe is driven by serioparallel exchange chip U6, model 74HC595.
11,12,14 pins of the serioparallel exchange chip U6 connect 16,19,15 pins of single-chip microcomputer U3 respectively, and the 13 of U6
Pin is grounded, and 10,16 pins connect 3.3V voltages, and 8 pins ground connection, 15 and 1～7 pin are sequentially connected by resistance RP1, RP2
A～H pins of group of four figures display tube U5,1,4,5,12 pins of group of four figures display tube U5 are sequentially connected audion respectively
The emitter stage of Q1, Q6, Q4, Q3, the base stage of audion Q1, Q6, Q4, Q3 are sequentially connected resistance R12, R13, R14, R85 respectively
One end, the other end of resistance R12, R13, R14, R85 connect 18,22,17,21 pins of single-chip microcomputer U3 respectively, audion Q1,
The colelctor electrode of Q6, Q4, Q3 connects 3.3V voltages.
Preferably, described resistance RP1, RP2 are 330 Ω, and the resistance of resistance R12, R13, R14, R85 is 1K Ω, and three
Pole pipe Q1, Q6, Q4, Q3 are NPN type triode.
The above is the preferred embodiment of the present invention, for those skilled in the art,
Without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications are also regarded as this
Bright protection domain.
Claims (7)
1. a kind of bus-type temperature measuring equipment, is characterized in that：Including power module, temperature survey modular converter, control module
With bus communication module, the power module powers for device, and the temperature survey modular converter and bus communication module connect
Connect the control module；
The temperature-measuring module obtains temperature signal, and the temperature signal is exported to control module, and the control module connects
The temperature signal is received, temperature signal is exported to communication module；
The temperature-measuring module includes voltage reference circuit, voltage follower circuit, temperature sensor U7 and voltage amplifier circuit,
Also including the resistance bridge circuit of temperature sensor U7, the voltage reference circuit connects the input of voltage follower circuit, temperature
The resistance bridge circuit of sensor U7 connects the input of voltage amplifier circuit, the voltage follower circuit and voltage amplifier circuit
Outfan connects the control module.
2. a kind of bus-type temperature measuring equipment according to claim 1, is characterized in that：The control module includes monolithic
Machine U3, the voltage reference circuit include fiducial chip U39, export the reference voltage of 2.5V, and the voltage follower circuit includes
Operational amplifier U4A, 2.5V reference voltage accesses the in-phase input end of operational amplifier U4A, and the voltage amplifier circuit includes
The resistance bridge circuit outfan of the input jointing temp sensor U7 of operational amplifier U4B, operational amplifier U4B meets single-chip microcomputer U3
ADC collection terminals, resistance bridge circuit is also connected with the outfan of operational amplifier U4A, and the outfan connection of operational amplifier U4A is single
The ADC collection terminals of piece machine U3.
3. a kind of bus-type temperature measuring equipment according to claim 1, is characterized in that：The power module includes two-stage
24V voltage conversions are 5V voltages by voltage conversion circuit, first order voltage conversion circuit, and second level voltage conversion circuit is electric by 5V
Pressure is converted to 3.3V；
The first order voltage conversion circuit includes voltage stabilizing chip U44, and the second level voltage conversion circuit includes voltage stabilizing chip
U26, the first voltage change-over circuit also include resettable fuse F200, and one end of the resettable fuse F200 connects
24V voltages, the other end connect the positive pole of one end of TVS pipe D28 and diode D24 respectively, and the negative pole of diode D24 connects respectively
One end of electric capacity C68, C73 and C93 and 1 pin of voltage stabilizing chip U44,4 pins of voltage stabilizing chip U44 connect inductance respectively
L7, one end of electric capacity C121 simultaneously export 5V voltages, and 2 pins connect the other end of the negative pole of diode D41 and inductance L7, institute respectively
State TVS pipe, the other end of electric capacity C68, C73, C93, C121 to be grounded, 3, the 5 pins ground connection of voltage stabilizing chip U44 is described
The plus earth of diode D41；3 pins of voltage stabilizing chip U26 of the second voltage change-over circuit connect respectively 5V voltages and
One end of electric capacity C122, C89, C90,4 pins and 2 pins are connected, and connect one end of electric capacity C72, C91 respectively, the output of 2 pins
3.3V voltages, the other end of electric capacity C122, C89, C90, C72 and C91 are grounded.
4. a kind of bus-type temperature measuring equipment according to claim 2, is characterized in that：The voltage reference circuit is also wrapped
Filter capacitor C98, C102, C103 is included, the voltage follower circuit also includes resistance R16, R17, the temperature sensor U7's
Resistance bridge circuit includes resistance R21, R22, R27 and PT100, the voltage amplifier circuit also include resistance R23, R25, R26 and
R30, the temperature survey change-over circuit also include resistance R18, R24 and electric capacity C13～C15, C18；
1 pin of the fiducial chip U39 connects one end of electric capacity C98 and 3.3V voltages, another termination of electric capacity C98 respectively
Ground, 3 pins of fiducial chip U39 connect one end of electric capacity C102, C103 and ground respectively, 2 pins connect respectively electric capacity C102,
One end of the other end and resistance R17 of C103, the in-phase input end of another termination operational amplifier U4A of resistance R17, computing are put
The inverting input of big device U4A connects one end of resistance R16 and electric capacity C13 respectively, and outfan connects resistance R16, electric capacity respectively
One end of the other end and resistance R18 of C13, the other end of resistance R18 connect one end of electric capacity C15 and the 13 of single-chip microcomputer U3 respectively
Pin, the other end ground connection of electric capacity C15, the 4 pins ground connection of operational amplifier U4A, 8 pins connect one end of electric capacity C14 respectively
With 3.3V voltages, the other end ground connection of electric capacity C14；
One end of the resistance temperature sensor PT100 connects one end of resistance R21, R23 respectively, and the other end connects resistance respectively
One end and ground of R27, the other end of resistance R21 connect the outfan of the other end and operational amplifier U4A of resistance R22 respectively,
The other end of resistance R22 connects one end of the other end of resistance R27 and resistance R25 respectively, and the other end of resistance R23 connects respectively
One end of the in-phase input end and resistance R26 of operational amplifier U4B, the other end ground connection of resistance R26, the other end of resistance R25
One end of the in-phase input end and resistance R30 of difference concatenation operation amplifier U4B, the outfan of operational amplifier U4B connect respectively
One end of the other end and resistance R24 of connecting resistance R30, the other end of resistance R24 connect one end and the single-chip microcomputer of electric capacity C18 respectively
14 pins of U3, the other end ground connection of electric capacity C18.
5. a kind of bus-type temperature measuring equipment according to claim 2, is characterized in that：The model of the single-chip microcomputer U3 is
STM32F103C8T6, the control module also include watchdog circuit and crystal oscillating circuit, and the watchdog circuit includes reset coil
Piece U33, model MAX6823,1,4 pins of reset chip U33 connect the 7 of single-chip microcomputer U3,25 pins, reset chip respectively
5 pins of U33 connect one end of 3.3V voltages and electric capacity C66,2 pins ground connection, the other end ground connection of electric capacity C66 respectively；It is described
Crystal oscillating circuit includes crystal oscillator Y1, and one end of the crystal oscillator Y1 connects one end of 5 pins and electric capacity C1 of single-chip microcomputer U3, crystal oscillator respectively
The other end of Y1 connects one end of 6 pins and electric capacity C2 of single-chip microcomputer U3 respectively, and the other end of electric capacity C1, C2 is grounded；
7 pins of the single-chip microcomputer U3 are also respectively connected with resistance R11, one end of electric capacity C3, the other end connection 3.3V of resistance R11
Power supply, the other end ground connection of electric capacity C3, the 1 of single-chip microcomputer U3,24,36,48,9 pins connect 3.3V voltages, 44,20 pins difference
One end of connection resistance R3, R5, the other end of resistance R3, R5 is grounded, the 23 of single-chip microcomputer U3,35,47,8 pins are grounded.
6. a kind of bus-type temperature measuring equipment according to claim 2, is characterized in that：The bus communication module includes
Transceiver U9, model SP3485,1,4 pins of transceiver U9 connect the 31 of single-chip microcomputer U3,30 pins respectively, transceiver U9's
2nd, 4 pins are connected and distinguish the colelctor electrode of connecting triode Q2 and one end of resistance R100, the other end connection of resistance R100
3.3V voltages, the grounded emitter of audion Q2, base stage connect one end of resistance R14, and the other end of resistance R14 meets single-chip microcomputer U3
30 pins, 8 pins of transceiver U9 connect one end and the 3.3V voltages of electric capacity C21 respectively, the other end ground connection of electric capacity C21,
7 pins of transceiver U9 connect one end of resistance R31, R1 and TVS pipe D3, D7, the other end ground connection of resistance R31, transmitting-receiving respectively
6 pins of device U9 connect the other end of resistance R32, one end of TVS pipe D4 and TVS pipe D7 respectively, and the other end of resistance R1 passes through
Single-pole single-throw switch (SPST) U2 is connected with 6 pins of transceiver, and resistance R32, TVS pipe D3, the other end of TVS pipe D4 are grounded, resistance
One end of R1 outputs signal to host computer, and the other end outputs signal to host computer by single-pole single-throw switch (SPST) U2.
7. a kind of bus-type temperature measuring equipment according to claim 1, is characterized in that：Also include display module, it is described
Display module is connected with control module, displays temperature value；The display module includes group of four figures pipe U5, model DPY-4CA,
The group of four figures pipe is driven by serioparallel exchange chip U6, model 74HC595.
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