CN205562066U - A measuring circuit for PT1000 temperature sensor - Google Patents
A measuring circuit for PT1000 temperature sensor Download PDFInfo
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- CN205562066U CN205562066U CN201620112010.9U CN201620112010U CN205562066U CN 205562066 U CN205562066 U CN 205562066U CN 201620112010 U CN201620112010 U CN 201620112010U CN 205562066 U CN205562066 U CN 205562066U
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Abstract
The utility model belongs to the field of the diesel engine monitoring technique and discloses a measuring circuit for PT1000 temperature sensor, include: the outside temperature sensor of system gathers input circuit part_A, 8 selects 1 multiplex electronic switching circuit and precision operational -amplifier, the 8 input sa that select 1 multiplex electronic switching circuit sb gathers the input circuit part_A output with the outside temperature sensor of system and links to each other, 8 do you select 1 multiplex electronic switching circuit's output da db links to each other with the precision operational -amplifier input. The utility model provides a thereby sensor power supply voltage, its design value of AD converter benchmark reference voltage and effective value error arouse the problem of temperature measurement error, can make 0 to 200 DEG C measuring range with the error control within 1 DEG C, reached the required precision of diesel engine monitoring system to medium temperature signal measurement such as cooling water, lubricating oil, simplified circuit design simultaneously.
Description
Technical field
This utility model belongs to diesel engine monitoring technical field.Relate generally to for diesel coolant, lubricating oil, enter machine sky
A kind of measuring method for PT1000 temperature sensor of the medium temperature signal measurements such as gas and measuring circuit, this utility model
Also can be applied in the monitoring system of other chain drive.
Background technology
Temperature signal measurement is technological means conventional in industrial automatic control, according to application scenario, temperature-measuring range, essence
The temperature sensor type selected by factor such as degree requirement, application cost and power level of diesel engine is different.Diesel oil at present
The temperature sensor type that machine monitoring is conventional has Cu50, PT100, PT1000 etc., and its operating characteristic, manufacturing process, cost etc. are square
There is certain difference in face.PT1000 sensor relatively Cu50 sensor has more preferable temperature and resistance linear relationship, has wider compared with PT100
Resistance range be easier to detected, therefore use PT1000 sensor to make in High speed and heavy duty diesel engine monitoring system
It is a kind of well mode for cooling water, lubricating oil, the temperature signal detection of entering the media such as machine air.Matched sensor is surveyed
Amount circuit is also the important step affecting the factors such as certainty of measurement, the detection of current PT1000, PT100 platinum resistance temperature sensor
Circuit is taked the sampling of Hui Sidun electric bridge to add operation amplifier to carry out the mode of A/D conversion more more, this kind of mode electric bridge supply voltage and
Between design load and the actual value of A/D converter reference voltage, error will cause thermometric error to increase.
Utility model content
For solving above-mentioned technical problem, the purpose of this utility model is to propose a kind of survey for PT1000 temperature sensor
Metering method and measuring circuit.
This utility model adopts the following technical scheme that for completing its utility model task
A kind of measuring circuit for PT1000 temperature sensor, including: its exterior temperature sensor PT100 0 gathers
Input circuit Part_A, 8 selecting 1 multiplexing electronic switching circuit and precision operational-amplifier, 1 multiplexing electricity is selected in described 8
The input Sa-Sb of sub-on-off circuit and its exterior temperature sensor PT100 0 Gather and input circuit Part_A outfan phase
Even；8 select the outfan Da-Db of 1 multiplexing electronic switching circuit to be connected with precision operational-amplifier input.
A kind of measuring circuit for PT1000 temperature sensor, described its exterior temperature sensor PT100 0 gathers defeated
Enter circuit Part_A to be electrically connected with rc filter circuit by temperature sensor PT100 0 and form.
A kind of measuring circuit for PT1000 temperature sensor, described 8 select 1 multiplexing electronic switching circuit by integrated
Circuit ADG507 is constituted, and 8 to select the input of 1 multiplexing electronic switching circuit be Sa-Sb, and outfan is respectively Da-Db.
A kind of measuring circuit for PT1000 temperature sensor, described precision operational-amplifier circuit Part_B is by two-way
Transport and placing device U2, U3 compose in parallel, and the input anode of two-way transport and placing device U2, U3 in parallel selects 1 multiplexing electronic cutting respectively with 8
The outfan Da-Db closing circuit is connected；The input cathode of in parallel two-way transport and placing device U2, U3 respectively with two-way transport and placing device U2,
The output terminals A of U3, outfan B are connected；The in parallel output terminals A of two-way transport and placing device U2, U3, outfan B respectively by resistance with
Transport and placing device U4 is connected；The output terminals A of two-way transport and placing device U2, U3 in parallel and the dividing potential drop end C of the divider resistance being connected between outfan B
It is connected with transport and placing device U5.
A kind of measuring circuit for PT1000 temperature sensor, described transport and placing device U2, U3, U4, U5 model is integrated
Circuit AD8608.
Owing to using technical scheme as above, this utility model has a following superiority:
The measuring method of PT1000 temperature sensor described in the utility model and measuring circuit, solve because of sensor power
Voltage, its design load of A/D converter reference voltage are with actual value error thus cause the problem of thermometric error, hardware
The sampling error removing measure of circuit coordinates the filtering algorithm of software data, makes error control at the temperature-measuring range of 0 to 200 DEG C
Within ± 1 DEG C, reach the required precision to the cooling medium temperature signal measurement such as water, lubricating oil of the diesel engine monitoring system, with
Time simplify circuit design.
Accompanying drawing explanation
Fig. 1 is the measuring circuit figure for PT1000 temperature sensor；
Fig. 2 is the phasing meter schematic diagram of resistance value-temperature corrected value.
Detailed description of the invention
In conjunction with the drawings and specific embodiments, this utility model is illustrated:
As shown in Figure 1, 2, a kind of measuring circuit for PT1000 temperature sensor, including: its exterior temperature sensing
Device PT1000 Gather and input circuit Part_A, 8 select 1 multiplexing electronic switching circuit and precision operational-amplifier, 8 described choosings
The input Sa-Sb and its exterior temperature sensor PT100 0 Gather and input circuit Part_ of 1 multiplexing electronic switching circuit
A outfan is connected；8 select the outfan Da-Db of 1 multiplexing electronic switching circuit to be connected with precision operational-amplifier input.
Described its exterior temperature sensor PT100 0 Gather and input circuit Part_A is by temperature sensor PT100 0 and resistance
Capacitor filter circuit electrical connection composition.
Described 8 select 1 multiplexing electronic switching circuit to be made up of integrated circuit ADG507, and 8 select 1 multiplexing electrical switch
The input of circuit is Sa-Sb, and outfan is respectively Da-Db.
Described precision operational-amplifier circuit Part_B is composed in parallel by two-way transport and placing device U2, U3, two-way amplifier in parallel
The input anode of device U2, U3 selects the outfan Da-Db of 1 multiplexing electronic switching circuit to be connected respectively with 8；Two-way in parallel
The input cathode of transport and placing device U2, U3 is connected with output terminals A, the outfan B of two-way transport and placing device U2, U3 respectively；Two-way in parallel
The output terminals A of transport and placing device U2, U3, outfan B are connected with transport and placing device U4 by resistance respectively；Two-way transport and placing device U2, U3 in parallel
Output terminals A be connected with transport and placing device U5 with the dividing potential drop end C of the divider resistance being connected between outfan B.Described transport and placing device U2, U3,
U4, U5 model is integrated circuit AD8608；This circuit theory is as it is shown in figure 1, this circuit main devices includes that 8 select 1 multiplexing
Electrical switch ADG507 and precision operational-amplifier AD8608.
Fig. 1 represents in the solid box of left side the method for attachment of outside PT1000 temperature sensor；In order to make simple circuit just
In understanding, the most only draw the input circuit i.e. local circuit Part_A that 1 road PT1000 gathers.Side circuit plate contains 8 tunnels
PT1000 Gather and input circuit, i.e. employs identical totally 8 Part_A circuit, and output Sa, Sb of its correspondence are sequentially ingressed into
Input port S1a～S8a of ADG507 and S1b～S8b.ADG507 is passed through between local circuit Part_A and local circuit Part_B
It is connected.MCU exports control signal MCU-A0, MCU-A1, MCU-A2 and MCU-EN, defeated from 8 road PT1000 in order to control ADG507
Enter the 1 road signal selecting to wish to gather in circuit and send into Part_B, and finally output Output-MCU-AD1 and Output-MCU-
AD2 to MCU.
For ease of the operation principle of whole circuit is described, send into the situation of Da, Db here through ADG507 with Sa, Sb signal
As a example by be illustrated.
A kind of measuring method for PT1000 temperature sensor, its step is as follows:
1) signal of telecommunication transmission, gathered by the PT1000 temperature sensor of PT1000 measuring circuit is defeated to processor MCU
Enter end；It is to use PT1000 measuring circuit to complete the conversion to PT1000 temperature sensor signal, calibrate and sample；Will
The resistance value of PT1000 is converted to voltage value signal, and it sends into together with supply-reference voltage processor MCU；MCU exports
Control signal MCU-A0, MCU-A1, MCU-A2 and MCU-EN, select from 8 road PT1000 input circuits in order to control ADG507
Wish that the 1 road signal gathered sends into Part_B, and finally output Output-MCU-AD1 and Output-MCU-AD2 to MCU；
2), processor MCU to send into voltage signal be AD converted after, calculate resistance value, and root according to magnitude of voltage
Temperature value is calculated according to the prediction equation of sensor resistance Yu temperature；
The signal of telecommunication gathered as its exterior temperature sensor PT100 0 Gather and input circuit Part_A selects 1 multichannel multiple through 8
Enter integrated circuit ADG507 with the input Sa-Sb of electronic switching circuit and process feeding precision operational-amplifier circuit Part_B
The situation of input Da, Db:
Processor MCU carries out the AD conversion of 12 sampling precisions to Uout1, has
(1)
Amplifier U4 uses as difference amplifier, has
(2)
Amplifier U2, U3 use as non-inverting buffer, and the signal converting effect in conjunction with ADG507 has:
(3)
(4)
(5)
Therefore formula (5), (2) are substituted in (1), and, then have
(6)
According to design, ideally the reference voltage Uref of AD sampling is equal with sample circuit supply voltage U for 5V, public affairs
Formula (6) can be reduced to
(7)
MCU directly can calculate required sensor resistance according to formula (7).But practical situation, Uref and U with set
Meter magnitude of voltage is the most not quite identical, tests through reality, and Uref is between 4.97V～5.03V, and U is between 4.96V～5.05V.As
Fruit still uses formula (7), thus treats the maximum error of thermometric angle value introducing up to about 13 DEG C.For solving this problem, electricity
During the design of road, draw a supply-reference voltage UC at C point and send into MCU.The AD that MCU carries out 12 sampling precisions to Uout2 turns
Change, then have
(8)
Amplifier U5 uses as non-inverting buffer, has
(9)
From circuit diagram
(10)
(11)
(12)
Consider,, formula (9), (10), (11), (12) are substituted in (8), have
(13)
Formula (13) substitution (6) is obtained
(14)
MCU can calculate required sensor resistance according to formula (14).By introducing the AD of supply-reference voltage UC
Sampled value D2, can use D2 to replace scale factor during calculating sensor resistance, eliminate by MCU AD
The reference voltage Uref of transducer and the inconsistent error brought of sample circuit supply voltage U.Use Rpt according to equation below
Temperature value can be calculated.
(15)
There is nonlinearity erron when temperature survey in PT1000, it is carried out Linearized correction and can make measurement result more
Accurately.Therefore, before outwards testing temperature is treated in output, MCU can use segmentation to table look-up and temperature value Tr is entered by the method for linear interpolation
Line linearityization corrects.Concrete grammar is as follows: first set up the phasing meter of a resistance value-temperature corrected value, then root in MCU
Temperature corrected value Tc is determined, as shown in Equation (16) according to Rpt region interpolation method
(16)
Temperature value T to be measured is exported, such as formula (17) institute after temperature value Tr being modified finally according to temperature corrected value Tc
Show
(17)
This circuit solves reference voltage and the inconsistent measurement caused of sample circuit supply voltage of transducer MCU-AD
The inaccurate problem of result, achieves 8 tunnels in the case of only taking up 2 transducer MCU-AD sampling channels meanwhile
The time-sharing multiplex collection of PT1000 signal, completes the conversion to PT1000 temperature sensor signal, calibrates and sample.
Claims (5)
1., for a measuring circuit for PT1000 temperature sensor, it is characterized in that: including: its exterior temperature sensor
PT1000 Gather and input circuit Part_A, 8 selecting 1 multiplexing electronic switching circuit and precision operational-amplifier, described 8 select 1
The input Sa-Sb and its exterior temperature sensor PT100 0 Gather and input circuit Part_A of multiplexing electronic switching circuit
Outfan is connected；8 select the outfan Da-Db of 1 multiplexing electronic switching circuit to be connected with precision operational-amplifier input.
A kind of measuring circuit for PT1000 temperature sensor the most according to claim 1, is characterized in that: described system
External temperature sensor PT1000 Gather and input circuit Part_A is electrically connected with rc filter circuit by temperature sensor PT100 0
Composition.
A kind of measuring circuit for PT1000 temperature sensor the most according to claim 1, is characterized in that: described 8 select 1
Multiplexing electronic switching circuit is made up of integrated circuit ADG507, and 8 select the input of 1 multiplexing electronic switching circuit to be
Sa-Sb, outfan is respectively Da-Db.
A kind of measuring circuit for PT1000 temperature sensor the most according to claim 1, is characterized in that: described precision
Operation amplifier circuit Part_B is composed in parallel by two-way transport and placing device U2, U3, and the input of two-way transport and placing device U2, U3 in parallel is rectified
Pole selects the outfan Da-Db of 1 multiplexing electronic switching circuit to be connected respectively with 8；The input of two-way transport and placing device U2, U3 in parallel
End negative pole is connected with output terminals A, the outfan B of two-way transport and placing device U2, U3 respectively；The output of two-way transport and placing device U2, U3 in parallel
End A, outfan B are connected with transport and placing device U4 by resistance respectively；The output terminals A of two-way transport and placing device U2, U3 in parallel and outfan B
Between the dividing potential drop end C of divider resistance that connects be connected with transport and placing device U5.
A kind of measuring circuit for PT1000 temperature sensor the most according to claim 4, is characterized in that: described fortune
Putting device U2, U3, U4, U5 model is integrated circuit AD8608.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620112010.9U CN205562066U (en) | 2016-02-03 | 2016-02-03 | A measuring circuit for PT1000 temperature sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620112010.9U CN205562066U (en) | 2016-02-03 | 2016-02-03 | A measuring circuit for PT1000 temperature sensor |
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| Publication Number | Publication Date |
|---|---|
| CN205562066U true CN205562066U (en) | 2016-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620112010.9U Expired - Fee Related CN205562066U (en) | 2016-02-03 | 2016-02-03 | A measuring circuit for PT1000 temperature sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105651412A (en) * | 2016-02-03 | 2016-06-08 | 河南柴油机重工有限责任公司 | Measurement method and measurement circuit for PT1000 temperature sensor |
-
2016
- 2016-02-03 CN CN201620112010.9U patent/CN205562066U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105651412A (en) * | 2016-02-03 | 2016-06-08 | 河南柴油机重工有限责任公司 | Measurement method and measurement circuit for PT1000 temperature sensor |
| CN105651412B (en) * | 2016-02-03 | 2018-09-11 | 河南柴油机重工有限责任公司 | A kind of measurement method and measuring circuit for PT1000 temperature sensors |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160907 Termination date: 20190203 |
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| CF01 | Termination of patent right due to non-payment of annual fee |