CN206378219U - A kind of temperature transmitter - Google Patents
A kind of temperature transmitter Download PDFInfo
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- CN206378219U CN206378219U CN201621481814.2U CN201621481814U CN206378219U CN 206378219 U CN206378219 U CN 206378219U CN 201621481814 U CN201621481814 U CN 201621481814U CN 206378219 U CN206378219 U CN 206378219U
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Abstract
The utility model discloses a kind of temperature transmitter.A kind of standard that 4~20mA current signals are defaulted as automating industry is widely used by everybody, and environment temperature is particularly significant come the demand for meeting masses in the processed raw material of design temperature transmitter measurement and process.The utility model includes power supply module and pick-up output module；The 24V voltage conversions of input are that 5V is output to pick-up output module by voltage stabilizing conversion chip by power supply module；Temperature value is converted to voltage signal by pick-up output module by thermistor, then is exported the current signal that voltage signal is converted to 4~20mA by first resistor.The utility model, which need to only provide 24V DC voltages, can obtain accurately electric current output, and output is stable.
Description
Technical field
The utility model belongs to signal switch technology field, and in particular to a kind of temperature transmitter.
Background technology
In the industrial production of modernization, temperature plays extremely important role.For example：In metallurgical industry, chemical industry work
In all conglomeraties such as industry, food processing, power engineering and machine-building, people are required for processed raw material and processed
Environment temperature is measured and controlled in journey, to ensure the smooth and safe of the manufacturing.Generally measure a kind of physical quantity
Method is first to be translated into common analog quantity to be measured indirectly.In recent years, 4~20mA current signals are defaulted as automation
A kind of standard of industry is widely used by everybody.Thermometric original paper species miscellaneous, some special industrial thermometric instrument and meters more
It is sufficiently complex.And it is most of need import, price is sufficiently expensive, easily can not popularize and promote at home.Therefore design
A kind of stabilization, simple, cheap temperature transmitter are particularly significant come the demand for meeting masses.
The content of the invention
The purpose of this utility model is to provide a kind of temperature transmitting module that temperature value is converted to current signal.
The utility model includes power supply module and pick-up output module；Described power supply module will by voltage stabilizing conversion chip
The 24V voltage conversions of input are that 5V is output to pick-up output module；Described pick-up output module includes thermistor, double computings
Amplifier and triode QH1.Dual operational amplifier is made up of the first amplifier with the second amplifier.Second amplifier is just
Mutually input terminates rheostat R11 sliding end；The anti-phase input of second amplifier terminates the 9th resistance R9 one end；9th resistance
The 5V output ends of R9 another termination power supply module.The 13rd resistance R14 of output termination of second amplifier one end；13rd
Resistance R14 another termination triode QH1 base stage.The normal phase input end of first amplifier meets the 8th resistance R8 and the tenth
Resistance R10 one end；The 5V output ends of 8th resistance R8 another termination power supply module；Tenth resistance R10 another termination becomes
Hinder device R11 the first terminals；Rheostat R11 the second wiring terminates the 11st resistance R12 one end；11st resistance R12
The other end ground connection.The anti-phase input termination 3rd resistor R3 of first amplifier one end；3rd resistor R3 another termination
Four resistance R4, second resistance R2 and thermistor one end；The 5V output ends of 4th resistance R4 another termination power supply module；Heat
The output end of the amplifier of another termination first of quick resistance；Second resistance R2 the second diode of another termination D2 positive pole.The
The 7th resistance R7 of output termination of one amplifier one end, the 7th resistance R7 resistance R6 of another termination the 6th one end；6th
The resistance R6 resistance R13 of another termination the 12nd one end and the inverting input of the second amplifier；12nd resistance R13's is another
One terminates one end of triode QH1 emitter stage, the second diode D2 positive pole and first resistor R1；First resistor R1's is another
End ground connection.The negative supply voltage end ground connection of first amplifier, the 5V output ends of positive supply voltage end power supply module.Triode QH1
Colelctor electrode connect the current output terminal of power supply module.The positive supply voltage of amplifier terminates the 5V output ends of power supply module.First
Resistance R1 earth terminal is the current signal output end of pick-up output module.Temperature value is converted to voltage by described thermistor
Signal, first resistor exports the current signal that voltage signal is converted to 4~20mA.
Described power supply module includes conversion chip, and described conversion chip uses LP2951 voltage stabilizing conversion chips；Conversion
OUTPUT the and SENSE pins of chip connect the second electric capacity C2 one end, the second electric capacity C2 other end ground connection.Conversion chip
SHUTDOWN and GND pins are grounded.The VTAP pins of conversion chip are connected with FEEDBACK pins.The INPUT of conversion chip
Pin connects the 3rd electric capacity C3, the first electric capacity C1 one end and the first diode D1 negative pole；3rd electric capacity C3 and the first electric capacity C1
The other end be grounded；First diode D1 positive pole connects the 5th resistance R5 one end；5th resistance R5 another termination 24V electricity
Pressure.First diode D1 negative pole is the current output terminal of power supply module.The OUTPUT pins of conversion chip are power supply module
5V output ends.
Described thermistor uses platinum resistance thermometer sensor, PT1000.
Described dual operational amplifier uses TLC27L21D dual operational amplifiers.
The utility model has an advantageous effect in that：
1st, the utility model, which need to only provide 24V DC voltages, can obtain accurately electric current output.
2nd, the utility model is applicable various industrial occasions, meets industry demand.
3rd, the utility model circuit structure is simple, and output is stable and with low cost.
Brief description of the drawings
Fig. 1 is system block diagram of the present utility model；
Fig. 2 is the circuit theory diagrams of power supply module in the utility model；
Fig. 3 is the circuit theory diagrams of pick-up output module in the utility model.
Embodiment
The utility model is described in further detail below in conjunction with the accompanying drawings.
As shown in figure 1, a kind of temperature transmitter, including power supply module 101 and pick-up output module 102；Power supply module 101
The 24V voltage conversions of input are output to by pick-up output module 102 for 5V by voltage conversion chip；Pick-up output module 102
Temperature value is converted to by voltage signal by thermistor, then is converted to voltage signal by sampling resistor (first resistor R1)
The current signal output of 4~20mA stabilization.
As shown in Fig. 2 power supply module 101 includes conversion chip U2, conversion chip U2 uses LP2951 voltage stabilizing conversion chips；
Conversion chip U2 OUTPUT and SENSE pins connect the second electric capacity C2 one end, the second electric capacity C2 other end ground connection.Conversion
Chip U2 SHUTDOWN and GND pins are grounded.Conversion chip U2 VTAP pins are connected with FEEDBACK pins.Change core
Piece U2 INPUT pins connect the 3rd electric capacity C3, the first electric capacity C1 one end and the first diode D1 negative pole；3rd electric capacity C3 and
The first electric capacity C1 other end is grounded；First diode D1 positive pole connects the 5th resistance R5 one end；5th resistance R5's is another
One termination 24V voltages.First diode D1 negative pole is the current output terminal A-1 of power supply module 101.Conversion chip U2's
OUTPUT pins are the 5V output ends VOUT of power supply module 101.
As shown in figure 3, pick-up output module 102 includes thermistor RTD1, dual operational amplifier and triode QH1.Heat
Quick resistance RTD1 uses platinum resistance thermometer sensor, PT1000；Dual operational amplifier uses TLC27L21D dual operational amplifiers, double operation amplifiers
Device is made up of the first amplifier U1A with the second amplifier U1B.Second amplifier U1B normal phase input end connects rheostat R11 cunning
Moved end；Second amplifier U1B anti-phase input terminates the 9th resistance R9 one end；9th resistance R9 another termination power supply module
101 5V output ends VOUT.Second amplifier U1B the 13rd resistance R14 of output termination one end；13rd resistance R14's
Another termination triode QH1 base stage.First amplifier U1A normal phase input end connects the 8th resistance R8's and the tenth resistance R10
One end；The 5V output ends VOUT of 8th resistance R8 another termination power supply module 101；Tenth resistance R10 another termination variable resistance
Device R11 the first terminals；Rheostat R11 the second wiring terminates the 11st resistance R12 one end；11st resistance R12's
The other end is grounded.First amplifier U1A anti-phase input termination 3rd resistor R3 one end；3rd resistor R3 another termination
Four resistance R4, second resistance R2 and thermistor RTD1 one end；The 5V of 4th resistance R4 another termination power supply module 101 is defeated
Go out to hold VOUT；Thermistor RTD1 the first amplifier of another termination U1A output end；Second resistance R2 another termination second
Diode D2 positive pole.First amplifier U1A the 7th resistance R7 of output termination one end, the 7th resistance R7 another termination the
Six resistance R6 one end；The 6th resistance R6 resistance R13 of another termination the 12nd one end and the second amplifier U1B's is anti-phase defeated
Enter end；12nd resistance R13 another termination triode QH1 emitter stage, the second diode D2 positive pole and first resistor R1
One end；First resistor R1 other end ground connection.First amplifier U1A negative supply voltage end ground connection, positive supply voltage end is supplied
The 5V output ends VOUT of electric module 101.Triode QH1 colelctor electrode meets the current output terminal A-1 of power supply module 101.First puts
Big device U1A positive supply voltage terminates the 5V output ends VOUT of power supply module 101.First resistor R1 earth terminal exports for pick-up
The current signal output end I of module 102.
Thermistor RTD1 resistance increases with the rise of temperature, reduces with the reduction of temperature；Suitable for neutral and
Oxidant, stability is good, with certain non-linear, and temperature-measuring range is -50~350 DEG C.
Operation principle of the present utility model is as follows：
The first amplifier U1A normal phase input ends voltage and the second amplifier U1B inverting inputs in dual operational amplifier
Voltage is equal.First amplifier U1A output end voltage value V0, the first amplifier U1A anti-phase input terminal voltage value V1, second
Amplifier U1B normal phase input end magnitudes of voltage V2, the second amplifier U1B output end voltage values V3And the electric current of pick-up output module 102
The current value I of signal output part calculation formula is as follows：
Wherein, Vout is the 5V output ends VOUT of power supply module 101 magnitude of voltage, and RTD is thermistor RTD1 resistance,
R6For the 6th resistance R6 resistance, R7For the 7th resistance R7 resistance, R8For the 8th resistance R8 resistance, R9For the 9th resistance R9
Resistance, R10For the tenth resistance R10 resistance, R11aFor the resistance between rheostat R11 sliding ends and the first terminals, R12For
11st resistance R12 resistance, R11bFor the resistance between rheostat R11 sliding ends and the second terminals, R13For the 12nd resistance
R13 resistance.
The first amplifier U1A in dual operational amplifier is equivalent to sign-changing amplifier, and the second amplifier U1B is equivalent to subtraction
Device.When the temperature varies, thermistor RTD1 resistance changes therewith, can derive that pick-up is exported according to formula
The current value I of the current signal output end of module 102 size.The accurate pick-up output of the current forms of temperature value is realized with this.
In addition, standardsizing rheostat R11 is sized to change the current value I of the current signal output end of pick-up output module 102 size,
Therefore standardsizing rheostat R11 is exactly to adjust zero point of the present utility model.
Claims (4)
1. a kind of temperature transmitter, including power supply module and pick-up output module；It is characterized in that：Described power supply module passes through
The 24V voltage conversions of input are that 5V is output to pick-up output module by voltage stabilizing conversion chip；Described pick-up output module includes
Thermistor, dual operational amplifier and triode QH1；Dual operational amplifier is made up of the first amplifier with the second amplifier；Institute
The normal phase input end for stating the second amplifier connects rheostat R11 sliding end；The anti-phase input of second amplifier terminates the 9th resistance
R9 one end；The 5V output ends of 9th resistance R9 another termination power supply module；The electricity of output termination the 13rd of second amplifier
Hinder R14 one end；13rd resistance R14 another termination triode QH1 base stage；The normal phase input end of first amplifier
Connect the 8th resistance R8 and the tenth resistance R10 one end；The 5V output ends of 8th resistance R8 another termination power supply module；Tenth electricity
Hinder R10 another termination rheostat R11 the first terminals；Rheostat R11 the second wiring terminates the one of the 11st resistance R12
End；11st resistance R12 other end ground connection；The anti-phase input termination 3rd resistor R3 of first amplifier one end；3rd electricity
Hinder R3 the resistance R4 of another termination the 4th, second resistance R2 and one end of thermistor；4th resistance R4 another termination is powered
The 5V output ends of module；The output end of the amplifier of another termination first of thermistor；Second resistance R2 another termination second
Diode D2 positive pole；The 7th resistance R7 of output termination of first amplifier one end, the 7th resistance R7 another termination the 6th
Resistance R6 one end；The 6th resistance R6 resistance R13 of another termination the 12nd one end and the inverting input of the second amplifier；
The one of 12nd resistance R13 another termination triode QH1 emitter stage, the second diode D2 positive pole and first resistor R1
End；First resistor R1 other end ground connection；The negative supply voltage end ground connection of first amplifier, positive supply voltage end power supply module
5V output ends；Triode QH1 colelctor electrode connects the current output terminal of power supply module；The positive supply voltage termination power supply mould of amplifier
The 5V output ends of block；First resistor R1 earth terminal is the current signal output end of pick-up output module；Described thermistor
Temperature value is converted into voltage signal, first resistor exports the current signal that voltage signal is converted to 4~20mA.
2. a kind of temperature transmitter according to claim 1, it is characterised in that：Described power supply module includes conversion core
Piece, described conversion chip uses LP2951 voltage stabilizing conversion chips；OUTPUT the and SENSE pins of conversion chip connect the second electricity
Hold C2 one end, the second electric capacity C2 other end ground connection；SHUTDOWN the and GND pins of conversion chip are grounded；Conversion chip
VTAP pins be connected with FEEDBACK pins；The INPUT pins of conversion chip connect the 3rd electric capacity C3, the first electric capacity C1 one end
And first diode D1 negative pole；3rd electric capacity C3 and the first electric capacity C1 other end are grounded；First diode D1 positive pole
Connect the 5th resistance R5 one end；5th resistance R5 another termination 24V voltages；First diode D1 negative pole is power supply module
Current output terminal；The OUTPUT pins of conversion chip are the 5V output ends of power supply module.
3. a kind of temperature transmitter according to claim 1, it is characterised in that：Described thermistor uses platinum resistance thermometer sensor,
PT1000。
4. a kind of temperature transmitter according to claim 1, it is characterised in that：Described dual operational amplifier is used
TLC27L21D dual operational amplifiers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621481814.2U CN206378219U (en) | 2016-12-30 | 2016-12-30 | A kind of temperature transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621481814.2U CN206378219U (en) | 2016-12-30 | 2016-12-30 | A kind of temperature transmitter |
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| Publication Number | Publication Date |
|---|---|
| CN206378219U true CN206378219U (en) | 2017-08-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621481814.2U Active CN206378219U (en) | 2016-12-30 | 2016-12-30 | A kind of temperature transmitter |
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| CN (1) | CN206378219U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108024419A (en) * | 2017-12-26 | 2018-05-11 | 郑州创亿达照明有限公司 | The control system of LED aquatic animals lamps with emulated ecological environment sound |
-
2016
- 2016-12-30 CN CN201621481814.2U patent/CN206378219U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108024419A (en) * | 2017-12-26 | 2018-05-11 | 郑州创亿达照明有限公司 | The control system of LED aquatic animals lamps with emulated ecological environment sound |
| CN108024419B (en) * | 2017-12-26 | 2024-11-26 | 郑州创亿达照明有限公司 | Control system for LED aquarium lights with simulated ecological environment sound |
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