CN207636202U - A kind of temperature sampling circuit of high-precision platinum resistor - Google Patents
A kind of temperature sampling circuit of high-precision platinum resistor Download PDFInfo
- Publication number
- CN207636202U CN207636202U CN201721615610.8U CN201721615610U CN207636202U CN 207636202 U CN207636202 U CN 207636202U CN 201721615610 U CN201721615610 U CN 201721615610U CN 207636202 U CN207636202 U CN 207636202U
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- CN
- China
- Prior art keywords
- resistance
- platinum
- circuit
- operational amplifier
- output
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
A kind of temperature sampling circuit of high-precision platinum resistor, it include the three-wire system platinum resistance for sampling, information after sampling is passed to platinum resistance temperature sample circuit by three-wire system platinum resistance, platinum resistance temperature sample circuit is voltage value by the temperature transition that biasing circuit samples platinum resistance, the voltage value carries out the output of voltage by exporting computing circuit, the utility model has high-accuracy arithmetic, obtains the good output voltage values of the linearity.
Description
Technical field
The utility model is related to temperature sampling circuit technical field more particularly to a kind of temperature samplings of high-precision platinum resistor
Circuit.
Background technology
Temperature is the very important measurement parameter of sensor field, right with greatly developing for high-precision sensor field
The sampling request of temperature is higher and higher.It is wide since platinum resistance has the characteristics that the good linearity, fast response time, high certainty of measurement
General applies in the circuit of many temperature samplings, and the temperature value of sampling is converted to corresponding resistance value.
Although what use was most is the temperature of platinum resistance sampling at present, traditional platinum resistance samples temperature sensor is very
Difficulty overcomes measurement error caused by the reasons such as component drift, noise jamming.Cause on measurement accuracy, can not meet and want
It asks.
Invention content
For overcome the deficiencies in the prior art, the purpose of this utility model is to provide a kind of temperature of high-precision platinum resistor
Sample circuit returns to zero to the temperature value of sampling by biasing circuit, and sample circuit directly inputs three-wire system platinum resistance, has
The characteristics of output meets the output voltage values of high linearity, Low Drift Temperature.
To achieve the goals above, the utility model is achieved through the following technical solutions：
A kind of temperature sampling circuit of high-precision platinum resistor includes the three-wire system platinum resistance for sampling, three-wire system platinum electricity
Information after sampling is passed to platinum resistance temperature sample circuit 2 by resistance, and platinum resistance temperature sample circuit 2 will by biasing circuit 1
The temperature transition of platinum resistance sampling is voltage value, which carries out the output of voltage by exporting computing circuit 3.
Further, the biasing circuit 1 includes the one end and capacitance C1 of resistance R1 with resistance R2, R1 with resistance R2
One end is connected, while being connected to the normal phase input end of operational amplifier N1；The other end of resistance R1 is connected with reference voltage Vref；
The other end of resistance R2 is connected with the other end of capacitance C1, while being connected to ground wire.
Further, in the platinum resistance temperature sample circuit 2 the I- terminating resistors R3 of three-wire system platinum resistance one end,
Another termination reference voltage Vref of resistance R3；The ends V- of three-wire system platinum resistance and the inverting input phase of operational amplifier N1
Even；The ends A+ of three-wire system platinum resistance are connected with one end of resistance R4；The base stage of the output end and triode T1 of operational amplifier N1
It is connected, the collector of triode T1 is connected with reference voltage Vref, and the emitter of triode T1 is connected with the other end of resistance R4,
It is output to output computing circuit 3 simultaneously.
Further, the output signal of the platinum resistance temperature sample circuit 2 connects operation amplifier in output computing circuit 3
The normal phase input end of device N2, while being connected with one end of resistance R7；The inverting input of operational amplifier N2 and the one of resistance R5
End, one end of resistance R6, one end of capacitance C2 are connected；The other end of resistance R6 and the other end of capacitance C2 are connected with ground wire；Electricity
The other end of resistance R5 is connected with reference voltage Vref；The output end of operational amplifier N2 is connected with the other end of resistance R7, simultaneously
It is connected with the normal phase input end of operational amplifier N3；The inverting input of operational amplifier N3 and one end of resistance R8, resistance R9
One end, capacitance C3 one end be connected；The other end of resistance R8 is connected with reference voltage Vref；The other end and capacitance of resistance R9
The other end of C3 is connected, and is connected to the output end of operational amplifier N3, and export Vout.
The beneficial effects of the utility model：
The utility model solves traditional platinum resistance samples temperature sensor due to component drift, noise jamming etc.
Caused measurement error problem；By the zeroing of biasing circuit, the compensation of platinum resistance temperature sample circuit, export computing circuit
Filtering and quadratic fit, obtain the temperature sampling requirement of high linearity, Low Drift Temperature.
Description of the drawings
Fig. 1 is the utility model circuit the general frame.
Specific implementation mode
The utility model is described in detail with reference to the accompanying drawings.
As shown in Figure 1, the general frame of the utility model high-precision platinum resistor temperature sampling circuit, which is characterized in that packet
Include biasing circuit 1, platinum resistance temperature sample circuit 2, output computing circuit 3.The three-wire system platinum resistance of sampling is input to platinum resistance
Temperature sampling circuit 2 passes through biasing circuit 1 so that sample circuit is operated in best working condition, while platinum resistance being sampled
Temperature transition be voltage value, the voltage value by export computing circuit 3, obtain the output voltage of high linearity.
One end of resistance R1 in biasing circuit 1, resistance R2 one end be connected with one end of capacitance C1, while being connected to operation
The normal phase input end of amplifier N1；The other end of resistance R1 is connected with reference voltage Vref；The other end and capacitance C1 of resistance R2
The other end be connected, while being connected to ground wire.
One end of the I- terminating resistors R3 of three-wire system platinum resistance in platinum resistance temperature sample circuit 2, resistance R3's is another
Terminate reference voltage Vref；The ends V- of three-wire system platinum resistance are connected with the inverting input of operational amplifier N1；Three-wire system platinum electricity
The ends A+ of resistance are connected with one end of resistance R4；The output end of operational amplifier N1 is connected with the base stage of triode T1, triode T1
Collector be connected with reference voltage Vref, the emitter of triode T1 is connected with the other end of resistance R4, while being output to defeated
Go out computing circuit 3.
It exports in computing circuit 3, the output signal of platinum resistance temperature sample circuit 2 connects operation in output computing circuit 3 and puts
The normal phase input end of big device N2, while being connected with one end of resistance R7；The inverting input of operational amplifier N2 is with resistance R5's
One end, one end of resistance R6, one end of capacitance C2 are connected；The other end of resistance R6 and the other end of capacitance C2 are connected with ground wire；
The other end of resistance R5 is connected with reference voltage Vref；The output end of operational amplifier N2 is connected with the other end of resistance R7, together
When be connected with the normal phase input end of operational amplifier N3；The inverting input of operational amplifier N3 and one end of resistance R8, resistance
One end of R9, one end of capacitance C3 are connected；The other end of resistance R8 is connected with reference voltage Vref；The other end of resistance R9 and electricity
The other end for holding C3 is connected, and is connected to the output end of operational amplifier N3, and export Vout.
The utility model returns to zero to the temperature value of sampling by biasing circuit 1；Platinum resistance temperature sample circuit 2 is direct
Three-wire system platinum resistance is inputted, collected temperature value is converted to resistance and is input to platinum resistance temperature sample circuit 2 by platinum resistance, is led to
Collected resistance value is converted to high-precision voltage value by the compensation of over-sampling circuit；The voltage value of output is using output
Computing circuit 3 carries out voltage filter and quadratic fit, and output meets the output voltage values of high linearity, Low Drift Temperature, meets to platinum
The high-precision of electrical resistance collection temperature corresponds output.
Claims (1)
1. a kind of temperature sampling circuit of high-precision platinum resistor, which is characterized in that include the three-wire system platinum resistance for sampling, three
Information after sampling is passed to platinum resistance temperature sample circuit (2) by line platinum resistance, and platinum resistance temperature sample circuit (2) passes through
The temperature transition that biasing circuit (1) samples platinum resistance is voltage value, which carries out voltage by exporting computing circuit (3)
Output；
The biasing circuit (1) includes that resistance R1 is connected with resistance R2, R1 with one end of resistance R2 with one end of capacitance C1, together
When be connected to the normal phase input end of operational amplifier N1；The other end of resistance R1 is connected with reference voltage Vref；Resistance R2's is another
One end is connected with the other end of capacitance C1, while being connected to ground wire；
One end of the I- terminating resistors R3 of three-wire system platinum resistance in the platinum resistance temperature sample circuit (2), resistance R3's is another
One termination reference voltage Vref；The ends V- of three-wire system platinum resistance are connected with the inverting input of operational amplifier N1；Three-wire system platinum
The ends A+ of resistance are connected with one end of resistance R4；The output end of operational amplifier N1 is connected with the base stage of triode T1, triode
The collector of T1 is connected with reference voltage Vref, and the emitter of triode T1 is connected with the other end of resistance R4, is output to simultaneously
Export computing circuit (3)；
The output signal of the platinum resistance temperature sample circuit (2) is meeting in output computing circuit (3) operational amplifier N2 just
Phase input terminal, while being connected with one end of resistance R7；The inverting input of operational amplifier N2 and one end of resistance R5, resistance R6
One end, capacitance C2 one end be connected；The other end of resistance R6 and the other end of capacitance C2 are connected with ground wire；Resistance R5's is another
End is connected with reference voltage Vref；The output end of operational amplifier N2 is connected with the other end of resistance R7, while and operation amplifier
The normal phase input end of device N3 is connected；The inverting input of operational amplifier N3 and one end of resistance R8, one end of resistance R9, capacitance
One end of C3 is connected；The other end of resistance R8 is connected with reference voltage Vref；The other end of the other end and capacitance C3 of resistance R9
It is connected, is connected to the output end of operational amplifier N3, and export Vout.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721615610.8U CN207636202U (en) | 2017-11-28 | 2017-11-28 | A kind of temperature sampling circuit of high-precision platinum resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721615610.8U CN207636202U (en) | 2017-11-28 | 2017-11-28 | A kind of temperature sampling circuit of high-precision platinum resistor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207636202U true CN207636202U (en) | 2018-07-20 |
Family
ID=62854742
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721615610.8U Expired - Fee Related CN207636202U (en) | 2017-11-28 | 2017-11-28 | A kind of temperature sampling circuit of high-precision platinum resistor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207636202U (en) |
-
2017
- 2017-11-28 CN CN201721615610.8U patent/CN207636202U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180720 Termination date: 20191128 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |