CN108303187A - A kind of rotary body temp measuring system of wireless signal transmission - Google Patents
A kind of rotary body temp measuring system of wireless signal transmission Download PDFInfo
- Publication number
- CN108303187A CN108303187A CN201810130282.5A CN201810130282A CN108303187A CN 108303187 A CN108303187 A CN 108303187A CN 201810130282 A CN201810130282 A CN 201810130282A CN 108303187 A CN108303187 A CN 108303187A
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- resistance
- operational amplifier
- microcontroller
- receiving terminal
- conversion circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
- G01K1/024—Means for indicating or recording specially adapted for thermometers for remote indication
-
- 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
- G01K7/22—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 non-linear resistance, e.g. thermistor
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The invention discloses the rotary body temp measuring systems of wireless signal transmission, including transmitting terminal and receiving terminal；Transmitting terminal includes microcontroller, interactive connection has A/D conversion circuits and the RF modules with antenna on microcontroller, LCD segment encodes screen and keyboard interface are connected on microcontroller, transmitting terminal power supply is connected by LDO reducing transformers with microcontroller, and thermal resistance is connected by signal conditioning circuit with A/D conversion circuits；Receiving terminal includes receiving terminal microcontroller, in RF modules interactive connection to its microcontroller of the receiving terminal with antenna, interactive connection has receiving terminal D/A conversion circuits on microcontroller, it is connected with output buffer on D/A conversion circuits, analog output terminal is connected on output buffer, it is connected with keyboard interface on microcontroller, LED number screens are connected on microcontroller, receiving terminal power supply is connected to by DC/DC reducing transformers on microcontroller.The decaying and interference in wire signal transmission are avoided, the temperature value of measurement is more accurate, greatly reduced the maintenance work of user, has obtained the highly recognition of user.
Description
Technical field
The present invention relates to a kind of temp measuring system more particularly to a kind of rotary body temp measuring systems of wireless signal transmission.
Background technology
Traditional rotary (tank, pot, stove) during the work time will be monitored the temperature parameter of its inside, and will be real
The temperature signal of survey is transferred to secondary display control instrument by signal cable；So being generally used slip ring (in rotating machinery
Around be set with one group of machinery copper ring) mode come to thermometric instrument power and transmit temperature signal.
Since often very severe, mechanical copper ring are easy, by influences such as greasy dirt, dusts, to often lead to power site environment
With the interruption of signal transmission.Moreover the maintenance cost in slip ring mode later stage itself is higher.
Invention content
In order to solve the above technical problems, The present invention provides a kind of rotary body temp measuring systems of wireless signal transmission, keep away
The decaying and interference in wire signal transmission are exempted from, the temperature value of measurement is more accurate, greatly reduced the maintenance workers of user
Make, has obtained the highly recognition of user.
The present invention is to be achieved through the following technical solutions：
A kind of rotary body temp measuring system of wireless signal transmission, including transmitting terminal and receiving terminal；Transmitting terminal include thermal resistance,
Signal conditioning circuit, A/D conversion circuits and microcontroller, interactive connection has RF modules and A/D conversion circuits on the microcontroller,
It is connected with antenna on RF modules, LCD segment encodes screen and keyboard interface are connected on microcontroller, transmitting terminal power supply is depressured by LDO
Device is connected with microcontroller, and thermal resistance is connected by signal conditioning circuit with A/D conversion circuits；Receiving terminal includes receiving terminal RF moulds
Group, receiving terminal microcontroller and receiving terminal D/A conversion circuits are connected with antenna, the interaction of receiving terminal RF modules on receiving terminal RF modules
It is connected on receiving terminal microcontroller, interactive connection has receiving terminal D/A conversion circuits, receiving terminal D/A conversions on receiving terminal microcontroller
It is connected with output buffer on circuit, analog output terminal is connected on output buffer, is connected on receiving terminal microcontroller
There is keyboard interface, also there is LED number screens, receiving terminal power supply to pass through DC/DC by showing to be drivingly connected on receiving terminal microcontroller
Reducing transformer is connected on receiving terminal microcontroller.
Microcontroller in the transmitting terminal is MC9S08LL16 microcontrollers, and RF modules are Si4432 wireless modules, thermoelectricity
It is the magnifier built using low-power consumption amplifier MCP609 that resistance, which uses Pt100 thermal resistances, signal conditioning circuit, and A/D turns
It is 16 A/D converter AD7792 of low-power consumption to change circuit.
Microcontroller in the receiving terminal is MC9S8QE32CLC microcontrollers, and RF modules are Si4432 wireless modules, LED
It is 12 D/A converters that digital screen, which drives the common cathode charactron composition of 0.39 inch, D/A conversion circuits using HT1620,
MCP4728, the buffer circuit that output buffer LM224, BS170 and JS281 field-effect tube is built.
The transmitting terminal microcontroller is interconnected using SPI and RF modules, and transmitting terminal microcontroller is turned by SPI and A/D
Change circuit interactive connection；Receiving terminal microcontroller is interconnected using SPI and RF modules, and receiving terminal microcontroller is turned by SPI and D/A
Circuit interactive connection is changed, transmitting terminal power supply uses lithium battery power supply, receiving terminal power supply to power using 24V DC power supplies.
Signal conditioning circuit includes operational amplifier U10A, U10B, U10C and U10D, thermal resistance 2 in the transmitting terminal
Number interface is connected with the electrode input end of operational amplifier U10C, and the electrode input end of operational amplifier U10C also connects through capacitance
Ground, No. 3 interfacing grounds of thermal resistance, No. 1 interface of thermal resistance divide two-way, and the resistance R6 and R7 being concatenated all the way are connected to operation amplifier
The negative input of the output end of device U10C, operational amplifier U10C is connected between resistance R6 and R7, operational amplifier U10C
Output end be connected on the electrode input end of operational amplifier U10D after resistance R9 and resistance R10, operational amplifier U10D
Output end be connected to after capacitance C1 between resistance R9 and resistance R10, what the output end of operational amplifier U10D was also concatenated
It is grounded after resistance R8 and resistance R15, the negative input of operational amplifier U10D is connected between resistance R9 and resistance R10, fortune
The electrode input end for calculating amplifier U10D is also grounded through capacitance C2, and the output end of operational amplifier U10D is connected to through resistance R12
On A/D conversion circuits, the another way of No. 1 interface of thermal resistance is divided into two-way, and the anode for being connected to operational amplifier U10B all the way is defeated
Enter end, the resistance R1 and resistance R2 that another way is concatenated are connected on the negative input of operational amplifier U10A, operation amplifier
The output end of device U10A is connected between resistance R1 and resistance R2, and the negative input of operational amplifier U10A connects through resistance R3
The negative input on ground, operational amplifier U10B is connected to the output end of oneself, and the output end of operational amplifier U10B is concatenated
Resistance R4 and resistance R5 after be connected on the voltage output end of voltage-reference REF3112, the anode of operational amplifier U10A
Input terminal is connected between resistance R4 and resistance R5, and the voltage output end of voltage-reference REF3112 is also grounded through capacitance C3.
The model MCP609 of operational amplifier U10A, U10B, U10C and U10D in the signal conditioning circuit.
Output buffer includes operational amplifier U1A, U1C and U1D in the receiving terminal, operational amplifier U1A's
Electrode input end is connected through resistance R7 with the output end of D/A conversion circuits, and the one end resistance R6 ground connection, one end is connected to operation amplifier
On the negative input of device U1A, the negative input of operational amplifier U1A is also connected to the output end of oneself through resistance R8
On, the output end of operational amplifier U1A is connected to through resistance R9 on the electrode input end of operational amplifier U1D, operational amplifier
The output end of U1D is connected on the grid of field-effect tube Q1, and the negative input of operational amplifier U1D is connected to field-effect tube Q1
Source electrode, the drain electrode of field-effect tube Q1 is directly connected to direct current 24V voltages by resistance R1, and the source electrode of field-effect tube Q1 passes through resistance
R2 is grounded, and the drain electrode of field-effect tube Q1 is connected to the electrode input end of operational amplifier U1C, and the cathode of operational amplifier U1C is defeated
Enter end to be connected on the source electrode of field-effect tube Q2, direct current 24V voltages, field effect are also connect by resistance R3 on the source electrode of field-effect tube Q2
Should the drain electrode of pipe Q2 be connected to after diode D1 on analog output terminal, the output end connection of operational amplifier U1C is shown up
The grid of effect pipe Q2.
The model LM224AD of described operational amplifier U1A, U1C and the U1D.
Compared with prior art, the present invention has technique effect beneficial below：
The rotary body temp measuring system of wireless signal transmission provided by the invention is applied to Internet of Things, rotary process monitoring
The information collection of equipment, using the rotary body temp measuring system of wireless signal transmission, avoid decaying in wire signal transmission and
Interference, the temperature value of measurement is more accurate, greatly reduced the maintenance work of user, has obtained the highly recognition of user.
Description of the drawings
Fig. 1 be wireless signal transmission provided by the invention rotary body temp measuring system in transmitting terminal structural schematic diagram；
Fig. 2 be wireless signal transmission provided by the invention rotary body temp measuring system in transmitting terminal microcontroller and RF modules
Circuit diagram；
Fig. 3 be wireless signal transmission provided by the invention rotary body temp measuring system in transmitting terminal signal conditioning circuit and
The circuit diagram of A/D conversion circuits；
Fig. 4 be wireless signal transmission provided by the invention rotary body temp measuring system in receiving terminal structural schematic diagram；
Fig. 5 be wireless signal transmission provided by the invention rotary body temp measuring system in receiving terminal microcontroller and RF modules
Circuit diagram；
Fig. 6 be wireless signal transmission provided by the invention rotary body temp measuring system in receiving terminal D/A converting circuit and
The circuit diagram of output buffer.
Specific implementation mode
With reference to specific embodiment, the present invention is described in further detail, it is described be explanation of the invention and
It is not to limit.
Referring to Fig. 1 to Fig. 6, a kind of rotary body temp measuring system of wireless signal transmission, including transmitting terminal and receiving terminal；Transmitting
End includes thermal resistance, signal conditioning circuit, A/D conversion circuits and microcontroller, and being interconnected on the microcontroller has RF modules
With A/D conversion circuits, antenna is connected on RF modules, and LCD segment encodes screen and keyboard interface, transmitting terminal electricity are connected on microcontroller
Source is connected by LDO reducing transformers with microcontroller, and thermal resistance is connected by signal conditioning circuit with A/D conversion circuits；Receiving terminal packet
Receiving terminal RF modules, receiving terminal microcontroller and receiving terminal D/A conversion circuits are included, antenna is connected on receiving terminal RF modules, is received
It holds in RF modules interactive connection to receiving terminal microcontroller, interactive connection has receiving terminal D/A conversion circuits on receiving terminal microcontroller, connects
It is connected with output buffer on receiving end D/A conversion circuits, analog output terminal, receiving terminal list are connected on output buffer
Keyboard interface is connected on piece machine, being also drivingly connected by display on receiving terminal microcontroller has LED number screens, receiving terminal power supply
It is connected on receiving terminal microcontroller by DC/DC reducing transformers.
Wherein, the microcontroller in the transmitting terminal is MC9S08LL16 microcontrollers, and RF modules are Si4432 wireless modules,
Thermal resistance uses Pt100 thermal resistances, and signal conditioning circuit is the magnifier built using low-power consumption amplifier MCP609, A/
D conversion circuits are 16 A/D converter AD7792 of low-power consumption.Microcontroller in the receiving terminal is MC9S8QE32CLC monolithics
Machine, RF modules are Si4432 wireless modules, and LED number screens drive the common cathode charactron composition of 0.39 inch using HT1620,
D/A conversion circuits are 12 D/A converter MCP4728, and output buffer LM224, BS170 and JS281 field-effect tube is taken
The buffer circuit built.
It should be noted that the transmitting terminal microcontroller is interconnected using SPI and RF modules, transmitting terminal microcontroller is logical
SPI is crossed to interconnect with A/D conversion circuits；Receiving terminal microcontroller is interconnected using SPI and RF modules, and receiving terminal microcontroller is logical
It crosses SPI to interconnect with D/A conversion circuits, transmitting terminal power supply uses 3.6V lithium battery power supplies, receiving terminal power supply to use 24V direct currents
Power supply power supply.
Specifically, referring to Fig. 3, signal conditioning circuit includes operational amplifier U10A, U10B, U10C in the transmitting terminal
And U10D, No. 2 interfaces of thermal resistance are connected with the electrode input end of operational amplifier U10C, the anode input of operational amplifier U10C
End is also through capacity earth, No. 3 interfacing grounds of thermal resistance, and No. 1 interface of thermal resistance divides two-way, and the resistance R6 and R7 being concatenated all the way connect
It is connected to the output end of operational amplifier U10C, the negative input of operational amplifier U10C is connected between resistance R6 and R7, fortune
The output end for calculating amplifier U10C is connected to after resistance R9 and resistance R10 on the electrode input end of operational amplifier U10D, is transported
The output end for calculating amplifier U10D is connected to after capacitance C1 between resistance R9 and resistance R10, the output of operational amplifier U10D
It holds the resistance R8 being also concatenated and is grounded after resistance R15, the negative input of operational amplifier U10D is connected to resistance R9 and electricity
Between hindering R10, the electrode input end of operational amplifier U10D is also grounded through capacitance C2, and the output end of operational amplifier U10D is through electricity
Resistance R12 is connected on A/D conversion circuits, and the another way of No. 1 interface of thermal resistance is divided into two-way, is connected to operational amplifier all the way
The electrode input end of U10B, resistance R1 and resistance R2 that another way is concatenated are connected to the negative input of operational amplifier U10A
On, the output end of operational amplifier U10A is connected between resistance R1 and resistance R2, the negative input of operational amplifier U10A
It is grounded through resistance R3, the negative input of operational amplifier U10B is connected to the output end of oneself, and operational amplifier U10B's is defeated
It is connected on the voltage output end of voltage-reference REF3112 after resistance R4 and resistance R5 that outlet is concatenated, operational amplifier
The electrode input end of U10A is connected between resistance R4 and resistance R5, and the voltage output end of voltage-reference REF3112 is also through electricity
Hold C3 ground connection.Wherein, in the signal conditioning circuit operational amplifier U10A, U10B, U10C and U10D model
MCP609。
Referring to Fig. 6, output buffer includes operational amplifier U1A, U1C and U1D, operation amplifier in the receiving terminal
The electrode input end of device U1A is connected through resistance R7 with the output end of D/A conversion circuits, and the one end resistance R6 ground connection, one end is connected to
On the negative input of operational amplifier U1A, the negative input of operational amplifier U1A is also connected to oneself through resistance R8
On output end, the output end of operational amplifier U1A is connected to through resistance R9 on the electrode input end of operational amplifier U1D, operation
The output end of amplifier U1D is connected on the grid of field-effect tube Q1, and the negative input of operational amplifier U1D connects effect of showing up
Should pipe Q1 source electrode, the drain electrode of field-effect tube Q1 is directly connected to direct current 24V voltages by resistance R1, and the source electrode of field-effect tube Q1 is logical
Resistance R2 ground connection is crossed, the drain electrode of field-effect tube Q1 is connected to the electrode input end of operational amplifier U1C, operational amplifier U1C's
Negative input is connected on the source electrode of field-effect tube Q2, and also direct current 24V electricity is connect by resistance R3 on the source electrode of field-effect tube Q2
Pressure, the drain electrode of field-effect tube Q2 are connected to after diode D1 on analog output terminal, and the output end of operational amplifier U1C connects
It is connected to the grid of field-effect tube Q2.Wherein, the model LM224AD of described operational amplifier U1A, U1C and U1D.
It should be noted that transmitting terminal is temperature measuring section in the present invention, receiving terminal is signal transmission part.
The present invention changes original thermometric pattern, and temperature is measured and signal transmission part separates；Part is measured using electricity
Pond powers, and is rotated together with rotary tank (pot, stove).Temperature display, output par, c then use cable power to power.Pass through nothing
Line radiofrequency signal sends the temperature value for measuring part to neighbouring display, output par, c.
Specifically, the rotary body temp measuring system using wireless signal transmission is divided into：Transmitting terminal and receiving terminal two parts.Transmitting
End use lithium battery power supply, rotated together with rotary tank (pot, stove), acquired according to the fixed time interval of setting tested tank (pot,
Stove) internal temperature value.Receiving terminal is powered using 24V DC power supplies, and band screen display and analog quantity transformation export.Transmitting terminal and
Receiving terminal transmits signal using wireless communication mode.
Further specifically, the design of transmitting terminal
Master controller uses the MC9S08LL16 microcontrollers of freescale companies, wireless module to use silicon labs
The Si4432 of company is as wireless signal transmission channel.Temperature measuring section is using Pt100 thermal resistances, low-power consumption amplifier MCP609
16 A/D converter AD7792 compositions of low-power consumption of magnifier and ADI (analog device) company built.
The design of receiving terminal：
Master controller uses the MC9S8QE32CLC microcontrollers of freescale companies, wireless module to use silicon
The Si4432 of labs companies is as wireless signal transmission channel.Display portion is driven using the HT1620 of Shenzhen day micro semiconductor
0.39 cun of common cathode charactron composition.Electric current pick-up part have Wei Xin companies of the U.S. 12 D/A converter MCP4728 and
The buffer circuit composition that LM224 is built.
The rotary body temp measuring system of wireless signal transmission provided by the invention is applied to Internet of Things, rotary process monitoring
The information collection of equipment, using the rotary body temp measuring system of wireless signal transmission, avoid decaying in wire signal transmission and
Interference, the temperature value of measurement is more accurate, greatly reduced the maintenance work of user, has obtained the highly recognition of user.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (8)
1. a kind of rotary body temp measuring system of wireless signal transmission, which is characterized in that including transmitting terminal and receiving terminal；Transmitting terminal packet
Thermal resistance, signal conditioning circuit, A/D conversion circuits and microcontroller are included, interactive connection has RF modules and A/D on the microcontroller
Conversion circuit is connected with antenna on RF modules, and LCD segment encodes screen and keyboard interface are connected on microcontroller, and transmitting terminal power supply is logical
It crosses LDO reducing transformers with microcontroller to be connected, thermal resistance is connected by signal conditioning circuit with A/D conversion circuits；Receiving terminal includes connecing
Receiving end RF modules, receiving terminal microcontroller and receiving terminal D/A conversion circuits are connected with antenna, receiving terminal RF on receiving terminal RF modules
In module interactive connection to receiving terminal microcontroller, interactive connection has receiving terminal D/A conversion circuits, receiving terminal on receiving terminal microcontroller
It is connected with output buffer on D/A conversion circuits, analog output terminal, receiving terminal microcontroller are connected on output buffer
On be connected with keyboard interface, also there is LED number screens, receiving terminal power supply to pass through by showing to be drivingly connected on receiving terminal microcontroller
DC/DC reducing transformers are connected on receiving terminal microcontroller.
2. the rotary body temp measuring system of wireless signal transmission according to claim 1, which is characterized in that the transmitting terminal
In microcontroller be MC9S08LL16 microcontrollers, RF modules be Si4432 wireless modules, thermal resistance use Pt100 thermal resistances, letter
Number modulate circuit is the magnifier built using low-power consumption amplifier MCP609, and A/D conversion circuits are 16 A/D of low-power consumption
Converter AD7792.
3. the rotary body temp measuring system of wireless signal transmission according to claim 1, which is characterized in that the receiving terminal
In microcontroller be MC9S8QE32CLC microcontrollers, RF modules be Si4432 wireless modules, LED number screens using HT1620 drive
The common cathode charactron composition of dynamic 0.39 inch, D/A conversion circuits are 12 D/A converter MCP4728, and output buffer is
The buffer circuit that LM224, BS170 and JS281 field-effect tube are built.
4. the rotary body temp measuring system of wireless signal transmission according to claim 1, which is characterized in that the transmitting terminal
Microcontroller is interconnected using SPI and RF modules, and transmitting terminal microcontroller is interconnected by SPI and A/D conversion circuits；Receiving terminal
Microcontroller is interconnected using SPI and RF modules, and receiving terminal microcontroller is interconnected by SPI and D/A conversion circuits, transmitting terminal
Power supply uses lithium battery power supply, receiving terminal power supply to power using 24V DC power supplies.
5. the rotary body temp measuring system of wireless signal transmission according to claim 1, which is characterized in that the transmitting terminal
Middle signal conditioning circuit includes operational amplifier U10A, U10B, U10C and U10D, No. 2 interfaces of thermal resistance and operational amplifier
The electrode input end of U10C is connected, and also through capacity earth, No. 3 interfaces of thermal resistance connect the electrode input end of operational amplifier U10C
Ground, No. 1 interface of thermal resistance divide two-way, and the resistance R6 and R7 that are concatenated all the way are connected to the output end of operational amplifier U10C, fortune
The negative input for calculating amplifier U10C is connected between resistance R6 and R7, the output end of operational amplifier U10C through resistance R9 and
It is connected to after resistance R10 on the electrode input end of operational amplifier U10D, the output end of operational amplifier U10D is after capacitance C1
It is connected between resistance R9 and resistance R10, the resistance R8 and resistance R15 that the output end of operational amplifier U10D is also concatenated are followed by
The negative input on ground, operational amplifier U10D is connected between resistance R9 and resistance R10, and the anode of operational amplifier U10D is defeated
Enter end to be also grounded through capacitance C2, the output end of operational amplifier U10D is connected to through resistance R12 on A/D conversion circuits, thermal resistance 1
The another way of number interface is divided into two-way, is connected to the electrode input end of operational amplifier U10B, the electricity that another way is concatenated all the way
Resistance R1 and resistance R2 is connected on the negative input of operational amplifier U10A, and the output end of operational amplifier U10A is connected to electricity
Between hindering R1 and resistance R2, the negative input of operational amplifier U10A is grounded through resistance R3, the cathode of operational amplifier U10B
Input terminal is connected to the output end of oneself, is connected to after resistance R4 and resistance R5 that the output end of operational amplifier U10B is concatenated
On the voltage output end of voltage-reference REF3112, the electrode input end of operational amplifier U10A is connected to resistance R4 and resistance
Between R5, the voltage output end of voltage-reference REF3112 is also grounded through capacitance C3.
6. the rotary body temp measuring system of wireless signal transmission according to claim 5, which is characterized in that the signal tune
Manage the model MCP609 of operational amplifier U10A, U10B, U10C and U10D in circuit.
7. the rotary body temp measuring system of wireless signal transmission according to claim 1, which is characterized in that the receiving terminal
Middle output buffer includes operational amplifier U1A, U1C and U1D, the electrode input end of operational amplifier U1A through resistance R7 with
The output end of D/A conversion circuits is connected, and the one end resistance R6 ground connection, one end is connected on the negative input of operational amplifier U1A,
The negative input of operational amplifier U1A is also connected to through resistance R8 on the output end of oneself, the output of operational amplifier U1A
End is connected to through resistance R9 on the electrode input end of operational amplifier U1D, and the output end of operational amplifier U1D is connected to field-effect
On the grid of pipe Q1, the negative input of operational amplifier U1D is connected to the source electrode of field-effect tube Q1, the drain electrode of field-effect tube Q1
Direct current 24V voltages are directly connected to by resistance R1, the source electrode of field-effect tube Q1 is grounded by resistance R2, the drain electrode of field-effect tube Q1
It is connected to the electrode input end of operational amplifier U1C, the negative input of operational amplifier U1C is connected to the source of field-effect tube Q2
On extremely, direct current 24V voltages are also connect by resistance R3 on the source electrode of field-effect tube Q2, the drain electrode of field-effect tube Q2 is after diode D1
It is connected on analog output terminal, the output end of operational amplifier U1C is connected to the grid of field-effect tube Q2.
8. the rotary body temp measuring system of wireless signal transmission according to claim 7, which is characterized in that the operation is put
The model LM224AD of big device U1A, U1C and U1D.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810130282.5A CN108303187A (en) | 2018-02-08 | 2018-02-08 | A kind of rotary body temp measuring system of wireless signal transmission |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810130282.5A CN108303187A (en) | 2018-02-08 | 2018-02-08 | A kind of rotary body temp measuring system of wireless signal transmission |
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| CN108303187A true CN108303187A (en) | 2018-07-20 |
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| CN201810130282.5A Pending CN108303187A (en) | 2018-02-08 | 2018-02-08 | A kind of rotary body temp measuring system of wireless signal transmission |
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Application publication date: 20180720 |