CN102252767A - Temperature transmitter suitable for MF53 thermistor - Google Patents
Temperature transmitter suitable for MF53 thermistor Download PDFInfo
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- CN102252767A CN102252767A CN2011101714236A CN201110171423A CN102252767A CN 102252767 A CN102252767 A CN 102252767A CN 2011101714236 A CN2011101714236 A CN 2011101714236A CN 201110171423 A CN201110171423 A CN 201110171423A CN 102252767 A CN102252767 A CN 102252767A
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Abstract
The invention relates to a temperature transmitter suitable for an MF53 thermistor. The temperature transmitter provided by the invention carries out once modification on some section of nonlinear characteristics of a thermistor Rt by adopting a simple shunt resistance mode, thereby enabling nonlinear errors of physical parameters of R1 and Rt after parallel connection to be controlled below 0.1%; then, secondary modification is carried out on the output voltage of a bridge circuit by utilizing a forward characteristic curve of a voltage-stabilizing diode D, thereby reaching linear electric signal parameters in a needed measuring range; an effective measuring range is reduced, thereby improving the measuring resolution ratio; and when a temperature trend is changed, a temperature change trend can be foreseen in advance, thereby advancing control and demodulation time and improving control accuracy.
Description
Technical field
The present invention is a kind of temperature transmitter of the MF53 of being applicable to thermistor, belongs to thermometric instruments instrument industry and air-conditioning automatic control field
Background technology
Traditional platinum resistance temperature sensor is because the reference temperature resistance is low, temperature-resistance varying-ratio is little, when long-distance transmissions, be subjected to the influence of conductor resistance, can't guarantee the accuracy measured, therefore, when with platinum resistance during as temperature sensor, produce, manufacturer need sensor and transmitter are fabricated to integrated, with of the influence of solution conductor resistance to its generation.But during transmitter work, the heat that active component produces returns the accuracy that influences sensor measurement again so.For the control system of environment temperature control accuracy requirement at ± 0.1 ℃～± 0.5 ℃, the influence of this part heat can cause the control imbalance for the high precision air-conditioner control system, the temperature rise that it produced must be less than 0.05 ℃, otherwise The whole control system can not guarantee that error is ± 0.1 ℃～± 0.5 ℃ control accuracy requirement.If the heat influence that temperature rise causes to sensing that produces in the time of will solving the work of transmitter active component then needs it is split.
Platinum resistance Pt100 or Pt1000 temperature sensor and transmitter split installation, and there are two big weak points in its platinum resistance:
1. resistance/rate of temperature change is little, have only 0.39 Ω/℃;
2. reference resistor value is on the low side, Pt1000, and the resistance in the time of 0 ℃ has only 1000 Ω; Especially Pt100, the resistance in the time of 0 ℃ has only 100 Ω;
If adopt 0.75mm
2Copper conductor, transmission range 20m, this moment, conductor resistance was 0.91 Ω, the temperature deviation that it produced reaches 2.3 ℃; The temperature deviation that every meter distance produced is 0.115 ℃.On control theory, measuring accuracy will be higher than magnitude of control accuracy, could effectively guarantee control accuracy, so will guarantee that at least this part deviation is less than 0.05 ℃, so just conductor length must be accurate to below the 0.5m, this is difficult to accomplish in actual engineering construction.
Summary of the invention
The present invention designs the temperature transmitter that a kind of MF53 of being applicable to thermistor is provided at existing problems in the above-mentioned prior art just, its purpose mainly is the linearization that solves MF53 in the transmitter, next is will solve under the high-acruracy survey situation, transmitter power supply stability and transmitter output area the input range of corresponding controller.
By research to temperature-resistance corresponding relation of MF53, find that it changes less in the rate of curve of room temperature section relatively, must solve its nonlinear problem by linearization process, to guarantee also that simultaneously resistance/rate of temperature change remains on the higher level, can satisfy high-precision room temperature and detect.Can obtain the pairing relation of following table by calculating us:
| Temperature | Calculate resistance | Resistance after the linearization |
| 15 | 4340.843 | 1460.034 |
| 16 | 4162.522 | 1439.295 |
| 17 | 3992.68 | 1418.432 |
| 18 | 3830.865 | 1397.462 |
| 19 | 3676.649 | 1376.401 |
| 20 | 3529.63 | 1355.268 |
| 21 | 3389.431 | 1334.08 |
| 22 | 3255.695 | 1312.854 |
| 23 | 3128.085 | 1291.606 |
| 24 | 3006.286 | 1270.355 |
| 25 | 2890 | 1249.116 |
| 26 | 2778.945 | 1227.906 |
| 27 | 2672.854 | 1206.742 |
| 28 | 2571.479 | 1185.639 |
| 29 | 2474.582 | 1164.613 |
| 30 | 2381.94 | 1143.679 |
| 31 | 2293.341 | 1122.85 |
| 32 | 2208.586 | 1102.142 |
| 33 | 2127.487 | 1081.568 |
| 34 | 2049.866 | 1061.14 |
| 35 | 1975.552 | 1040.872 |
MF53 is through linearization process, every degree change in resistance is about 21 Ω, at 15 ℃～35 ℃ intervals linear degree is 0.5 ‰, 20 ℃～25 ℃ of the commonly used temperature control sections of high precision air-conditioning, according to the theoretical error 0.05 ‰ of the measuring accuracy after the linearization, can satisfy control accuracy fully and be ± 0.1 ℃ measurement requirement.
Secondly, the power supply of transmitter is another principal element that influences measuring accuracy, therefore must be paid attention on the bridge circuit powerup issue of transmitter, in order to guarantee the stability of bridge circuit power supply, adopts the accurate voltage stabilizing of secondary, to guarantee the stable of bridge circuit power supply.
Consider the received signal scope of controller, this transmitter comprises that also the output voltage range changes circuit, mediates with accurate multiturn potentiometer, and output signal is moved to required scope.
By above-mentioned research, the present invention proposes following technical scheme:
This kind is applicable to the temperature transmitter of MF53 thermistor, comprise stabilized voltage supply, precision type bridge, differential translation circuit, filtering circuit, amplifying circuit and output circuit, it is characterized in that: at precision type bridge is by resistance R 1, R2, the bridge circuit that R3 and R4 form, voltage stabilizing diode D of cross-over connection in this bridge circuit, the contact of R1 and R3 is connected in the end of voltage stabilizing diode D and the precision type bridge, the contact of R2 and R4 is connected in the other end of voltage stabilizing diode D and the precision type bridge, thermistor Rt is in parallel with R1, a certain section nonlinear characteristic to its MF53 thermistor once proofreaied and correct, and the nonlinearity erron of the physical parameter after R1 and the Rt parallel connection is controlled in 1 ‰; And then utilize the forward characteristic of voltage stabilizing diode D, precision type bridge bridge circuit output voltage is carried out the secondary correction, make bridge circuit output voltage and temperature variation linear, R1 and voltage stabilizing diode D constitute linearizer, and the value of R1 is 2K Ω～2.4K Ω.
Input end at output circuit connects a span shift circuit.
AC/DC transducer A1 in the stabilized voltage supply is connected to differential translation circuit, amplifying circuit and output circuit, stabilized voltage supply also connects a secondary regulated power supply, secondary regulated power supply mainly comprises two three terminal regulator A2 and A3, and A2 and A3 are precision type bridge and span shift circuit supply.
The advantage of technical solution of the present invention is:
Can ignore of the influence of transfer wire resistance, guarantee measuring accuracy sensor accuracy; In engineering, significantly reduce the workload of correction.Dwindle effective range, thereby improved Measurement Resolution, when temperature trend changes, shifted to an earlier date the regulating and controlling time, can improve control accuracy.Resistance/rate of temperature change height more can be predicted temperature changing trend in advance, makes control accuracy be more prone to guarantee.
Description of drawings
Fig. 1 is the structured flowchart of transmitter of the present invention
Fig. 2 is the basic circuit diagram of transmitter of the present invention
Embodiment
Below with reference to drawings and Examples technical solution of the present invention is further described:
Referring to accompanying drawing 1, shown in 2, this kind is applicable to the temperature transmitter of MF53 thermistor, comprise stabilized voltage supply 1, precision type bridge 3, differential translation circuit 4, filtering circuit 5, amplifying circuit 6 and output circuit 7, it is characterized in that: at precision type bridge 3 is by resistance R 1, R2, the bridge circuit that R3 and R4 form, voltage stabilizing diode D of cross-over connection in this bridge circuit, the contact of R1 and R3 is connected among the end of voltage stabilizing diode D and the accurate electricity emigrant 3, the contact of R2 and R4 is connected in the other end of voltage stabilizing diode D and the precision type bridge 3, thermistor Rt as temperature sensor is in parallel with R1, R1 and voltage stabilizing diode D constitute linearizer (2), and the value of R1 is 2K Ω～2.4K Ω.
In addition, the input end at output circuit 7 connects a span shift circuit 8.
AC/DC transducer A1 in the stabilized voltage supply 1 is connected to differential translation circuit 4, amplifying circuit 6 and output circuit 7, stabilized voltage supply 1 also connects a secondary regulated power supply 9, secondary regulated power supply 9 mainly comprises two three terminal regulator A2 and A3, and A2 and A3 are accurate electricity emigrant 3 and 8 power supplies of span shift circuit.Adopting secondary regulated power supply 9 can guarantee to become send output accuracy stable.
With the 0.75mm2 copper conductor, transmission range 20m is example: the MF53 influence of transfer wire after to linearization is 0.7 ‰, is higher than the error of MF53 temperature sensor itself far away, because of than ignoring of the influence of transfer wire resistance, guarantee measuring accuracy to sensor accuracy; In engineering, significantly reduce the workload of correction.
Compared with prior art, product of the present invention is once proofreaied and correct a certain section nonlinear characteristic of thermistor Rt with simple parallel resistance mode, and the nonlinearity erron of the physical parameter after R1 and the Rt parallel connection is controlled in 1 ‰; And then utilize the forward characteristic of voltage stabilizing diode D, the bridge circuit output voltage is carried out the secondary correction, thereby reach the linear electric signal parameter in required measurement range, dwindled effective range, thereby improved Measurement Resolution, when temperature trend changes, more can predict temperature changing trend in advance, shift to an earlier date the control conciliation time, can improve control accuracy.
Claims (3)
1. temperature transmitter that is applicable to the MF53 thermistor, comprise stabilized voltage supply (1), precision type bridge (3), differential translation circuit (4), filtering circuit (5), amplifying circuit (6) and output circuit (7), it is characterized in that: precision type bridge (3) is by resistance R 1, R2, the bridge circuit that R3 and R4 form, voltage stabilizing diode D of cross-over connection in this bridge circuit, the end of voltage stabilizing diode D is connected with the contact of middle R1 of precision type bridge (3) and R3, the other end of voltage stabilizing diode D is connected with the contact of middle R2 of precision type bridge (3) and R4, thermistor Rt is in parallel with R1, R1 and voltage stabilizing diode D constitute linearizer (2), and the value of R1 is 2K Ω～2.4K Ω.
2. the temperature transmitter that is applicable to the MF53 thermistor according to claim 1 is characterized in that: the input end at output circuit (7) connects a span shift circuit (8).
3. the temperature transmitter that is applicable to the MF53 thermistor according to claim 1 and 2, it is characterized in that: the AC/DC transducer A1 in the stabilized voltage supply (1) is connected to differential translation circuit (4), amplifying circuit (6) and output circuit (7), stabilized voltage supply (1) also connects a secondary regulated power supply (9), secondary regulated power supply (9) mainly comprises two three terminal regulator A2 and A3, and A2 and A3 are precision type bridge (3) and span shift circuit (8) power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101714236A CN102252767A (en) | 2011-06-24 | 2011-06-24 | Temperature transmitter suitable for MF53 thermistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101714236A CN102252767A (en) | 2011-06-24 | 2011-06-24 | Temperature transmitter suitable for MF53 thermistor |
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| Publication Number | Publication Date |
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| CN102252767A true CN102252767A (en) | 2011-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101714236A Pending CN102252767A (en) | 2011-06-24 | 2011-06-24 | Temperature transmitter suitable for MF53 thermistor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112229536A (en) * | 2020-06-02 | 2021-01-15 | 青岛鼎信通讯股份有限公司 | Method for measuring temperature of terminal block of electric energy meter |
| CN113899463A (en) * | 2021-12-10 | 2022-01-07 | 如果科技有限公司 | Temperature sampling correction circuit, temperature sampling device and vehicle |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3722283A (en) * | 1971-11-17 | 1973-03-27 | Kettering Scient Res Inc | Linear reading thermometer |
| CN2138295Y (en) * | 1992-08-08 | 1993-07-14 | 东南大学 | Electronic instant thermometer |
| CN2239025Y (en) * | 1995-11-20 | 1996-10-30 | 机械工业部上海工业自动化仪表研究所 | Integral two-line thermal couple temp. switch |
-
2011
- 2011-06-24 CN CN2011101714236A patent/CN102252767A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3722283A (en) * | 1971-11-17 | 1973-03-27 | Kettering Scient Res Inc | Linear reading thermometer |
| CN2138295Y (en) * | 1992-08-08 | 1993-07-14 | 东南大学 | Electronic instant thermometer |
| CN2239025Y (en) * | 1995-11-20 | 1996-10-30 | 机械工业部上海工业自动化仪表研究所 | Integral two-line thermal couple temp. switch |
Non-Patent Citations (1)
| Title |
|---|
| 《自动化与仪表》 19871231 李宝俊 电阻温度变送器的测量电桥 第45页 1-3 , * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112229536A (en) * | 2020-06-02 | 2021-01-15 | 青岛鼎信通讯股份有限公司 | Method for measuring temperature of terminal block of electric energy meter |
| CN113899463A (en) * | 2021-12-10 | 2022-01-07 | 如果科技有限公司 | Temperature sampling correction circuit, temperature sampling device and vehicle |
| CN113899463B (en) * | 2021-12-10 | 2022-04-19 | 如果科技有限公司 | Temperature sampling correction circuit, temperature sampling device and vehicle |
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Application publication date: 20111123 |