CN205102947U - Three -way formula platinum resistance PT100 temperature detection circuit - Google Patents
Three -way formula platinum resistance PT100 temperature detection circuit Download PDFInfo
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- CN205102947U CN205102947U CN201520919520.2U CN201520919520U CN205102947U CN 205102947 U CN205102947 U CN 205102947U CN 201520919520 U CN201520919520 U CN 201520919520U CN 205102947 U CN205102947 U CN 205102947U
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Abstract
The utility model discloses three -way formula platinum resistance PT100 temperature detection circuit, including reference source D1, sampling circuit and difference signal amplification circuit, reference source D1's output voltage access sampling circuit adopts wheatstone bridge as sampling circuit's input voltage, sampling circuit, and the sampled signal of its production inserts difference signal amplification circuit, thereby signal amplification circuit 2 relevant with the signal amplification circuit 1PT100 resistance of difference signal amplification circuit output records corresponding temperature value. The utility model discloses a three -way formula platinum resistance PT100 temperature detection circuit has solved the wire resistance to the influence that measuring result caused, has improved the precision of temperature measurement, especially solves remote temperature measurement and surveys inaccurate problem. In addition, the reference source circuit has completely cut off the influence of external power source noise to measuring result, difference signal amplification circuit adopts high input impedance and low output impedance's amplifier, realizes that voltage is accurate to enlarge, and the interference killing feature is strong, the on -the -spot demand of adaptation technology that can be better.
Description
Technical field
The utility model relates to technical field of temperature measurement, particularly relates to a kind of three-wire type platinum resistance thermometer sensor, PT100 temperature measurement circuit.
Background technology
Along with the progress of science and technology, electrical equipment is progressively towards the future development of high pressure, high-power, multifunction, and the temperature of the inner privileged site of electrical equipment judges it is the important indicator judging that whether it is intact.The resistance of platinum resistance thermometer sensor, and temperature suffered by it are approximated to linear relationship, and have signal sensitivity high, be easy to the features such as continuous coverage, therefore electrical equipment manufacturer is generally at the privileged site of equipment pre-buried PT100 type platinum resistance thermometer sensor, the change of PT100 resistance, converting relative change in voltage to by treatment circuit, device interior environment temperature can be calculated by measuring this voltage.
But, in the prior art, usually need resistance signal to be delivered in Computer Control Unit or other instrument by lead-in wire.Industrial heat resistance is arranged on production scene, and there is certain distance between pulpit, and therefore the lead-in wire of thermal resistance has larger impact to measurement result.
Utility model content
The utility model, in order to overcome the deficiency of above technology, provides a kind of three-wire type platinum resistance thermometer sensor, PT100 temperature measurement circuit, solves the impact that conductor resistance causes measurement result, improve measuring accuracy.
The utility model overcomes the technical scheme that its technical matters adopts:
A kind of three-wire type platinum resistance thermometer sensor, PT100 temperature measurement circuit, comprises reference source D1, sample circuit and circuit for amplifying differential signal;
Power supply is connected with 3 pin of reference source D1 through resistance R1, resistance R4 is connected with between 1 pin of reference source D1 and 3 pin, resistance R10 is connected with between 1 pin of reference source D1 and 2 pin, the 2 pin ground connection of reference source D1,1 pin produce a reference voltage, and the output voltage of reference source D1 accesses the input voltage of sample circuit as sample circuit;
Sample circuit adopts Wheatstone bridge, and resistance R6, R7, R13 and platinum resistance thermometer sensor, PT100 form 4 brachium pontis of Wheatstone bridge, and resistance R6 connects with platinum resistance thermometer sensor, PT100, and resistance R7 connects with resistance R13, and two series circuits are in parallel again; Described platinum resistance thermometer sensor, PT100 is three-wire type, one end of platinum resistance thermometer sensor, PT100 draws that a wire is connected with resistance R6 by 1 pin of terminal J1, the other end draw two wires respectively by terminal J1 2 pin and 3 pin and resistance R13 and power supply be connected, the sampled signal access differential signal amplification circuit that sample circuit produces;
Circuit for amplifying differential signal comprises amplifier U1A, amplifier U1B and amplifier U1C, platinum resistance thermometer sensor, PT100 is connected with the in-phase input end of amplifier U1A by resistance R2, resistance R7 is connected with the in-phase input end of amplifier U1B by resistance R17, resistance R9 and resistance R12 is connected between the reverse input end of amplifier U1A and the inverting input of amplifier U1B, feedback resistance R8 is connected with between the reverse input end of amplifier U1A and output terminal, feedback resistance R14 is connected with between the reverse input end of amplifier U1B and output terminal, the output terminal of amplifier U1A connects power supply ground through resistance R3 and resistance R5, resistance R3 is connected with the in-phase input end of amplifier U1C with the dividing potential drop of resistance R5, the output terminal of amplifier U1B is connected with the reverse input end of amplifier U1C by resistance R15, feedback resistance R16 is connected with between the reverse input end of amplifier U1C and output terminal, the output terminal of amplifier U1C exports a voltage signal relevant to platinum resistance thermometer sensor, PT100 resistance through diode D2 and the electric capacity C1 of resistance R11 and earth.
Preferred according to the utility model, three wires of described platinum resistance thermometer sensor, PT100 adopt equal lengths, iso-cross-section amasss, etc. the wire of material.
Preferred according to the utility model, described reference source D1 is that TL431, TL431 have that temperature characterisitic within the scope of low dynamical output resistance, total temperature is smooth, the advantage of low output voltage noise, and internal reference voltage is 2.5V; Resistance R6, R7 and R13 adopt Low Drift Temperature precision resistance; Circuit for amplifying differential signal adopts four high guaily unit integrated circuit LM324, and its inside comprises four groups of identical operational amplifiers of form, has the feature of high-gain, high input opposing, low output impedance, can realize voltage and accurately amplify.
The beneficial effects of the utility model are:
The utility model adopts three-wire type platinum resistance thermometer sensor, PT100 temperature measurement circuit, solves the impact that conductor resistance causes measurement result, improves the precision of thermometric, especially solve the indeterminable problem of remote temperature measurement.In addition, reference source circuit, has completely cut off the impact of external power source noise on measurement result; Circuit for amplifying differential signal, adopts the amplifier of high input impedance and low output impedance, realizes voltage and accurately amplify, and antijamming capability is strong, can adapt to the demand at technique scene preferably.
Accompanying drawing explanation
Fig. 1 is temperature measurement circuit schematic diagram of the present utility model.
Embodiment
Better understand the utility model for the ease of those skilled in the art, be described in further details below in conjunction with the drawings and specific embodiments to the utility model, following is only exemplary do not limit protection domain of the present utility model.
As shown in Figure 1, three-wire type platinum resistance thermometer sensor, PT100 temperature measurement circuit of the present utility model, comprise reference source D1, sample circuit and circuit for amplifying differential signal, reference source D1 is TL431.
Power supply is connected with 3 pin of reference source TL431 through resistance R1, resistance R4 is connected with between 1 pin of reference source TL431 and 3 pin, resistance R10 is connected with between 1 pin of reference source TL431 and 2 pin, the 2 pin ground connection of reference source TL431,1 pin produce the reference voltage of a 2.5V, now the output voltage of reference source TL431
, access sample circuit is as the input voltage of sample circuit.
Described sample circuit adopts Wheatstone bridge, resistance R6, R7, R13 and platinum resistance thermometer sensor, PT100 form 4 brachium pontis of Wheatstone bridge, resistance R6, R7 and R13 adopt Low Drift Temperature precision resistance, resistance R6 connects with platinum resistance thermometer sensor, PT100, resistance R7 connects with resistance R13, and two series circuits are in parallel again.Described platinum resistance thermometer sensor, PT100 is three-wire type place in circuit, three wires of platinum resistance thermometer sensor, PT100 adopt equal lengths, iso-cross-section amasss, etc. the wire of material, one end of platinum resistance thermometer sensor, PT100 draws that a wire is connected with resistance R6 by 1 pin of terminal J1, the other end draw two wires respectively by terminal J1 2 pin and 3 pin and resistance R13 and power supply be connected, when the resistance of platinum resistance thermometer sensor, PT100 changes, electric bridge produces a voltage differential signal, be called sampled signal, sampled signal access differential signal amplification circuit carries out signal and amplifies process.
Circuit for amplifying differential signal adopts four high guaily unit integrated circuit LM324, its inside comprises four groups of identical operational amplifiers of form, be called for short amplifier, wherein amplifier U1A, amplifier U1B and amplifier U1C are the inner three groups of separate operational amplifiers of four high guaily unit integrated circuit LM324, due to another group with less than, namely do not represent in the drawings.Platinum resistance thermometer sensor, PT100 is connected with the in-phase input end of amplifier U1A by resistance R2, resistance R7 is connected with the in-phase input end of amplifier U1B by resistance R17, resistance R9 and resistance R12 is connected between the reverse input end of amplifier U1A and the inverting input of amplifier U1B, feedback resistance R8 is connected with between the reverse input end of amplifier U1A and output terminal, feedback resistance R14 is connected with between the reverse input end of amplifier U1B and output terminal, the output terminal of amplifier U1A connects power supply ground through resistance R3 and resistance R5, resistance R3 is connected with the in-phase input end of amplifier U1C with the dividing potential drop of resistance R5, the output terminal of amplifier U1B is connected with the reverse input end of amplifier U1C by resistance R15, feedback resistance R16 is connected with between the reverse input end of amplifier U1C and output terminal, the output terminal of amplifier U1C exports a voltage signal relevant to platinum resistance thermometer sensor, PT100 resistance through diode D2 and the electric capacity C1 of resistance R11 and earth.
The utility model adopts three-wire type platinum resistance thermometer sensor, PT100 temperature measurement circuit, effectively can eliminate the impact of conductor resistance on temperature-measuring results.The resistance supposing on a section lead is that the resistance of r, PT100 is set to
; When bridge balance,
, as R6=R7,
, conductor resistance can not have an impact to measurement result.This three-wire type temperature measurement circuit eliminates the impact that conductor resistance causes measurement result, improves measuring accuracy.
Temperature measurement circuit described in the utility model, when the change in resistance of platinum resistance thermometer sensor, PT100, the voltage differential signal that on electric bridge, generation one is small, is sampled signal
, in circuit for amplifying differential signal,
,
,
,
.
through signal amplification circuit process, be amplified voltage
, after calculating the resistance of platinum resistance thermometer sensor, PT100, according to the linear relationship of platinum resistance thermometer sensor, PT100 and temperature, corresponding temperature value can be obtained.
Above only describes ultimate principle of the present utility model and preferred implementation, those skilled in the art can make many changes and improvements according to foregoing description, and these changes and improvements should belong to protection domain of the present utility model.
Claims (3)
1. a three-wire type platinum resistance thermometer sensor, PT100 temperature measurement circuit, is characterized in that: comprise reference source D1, sample circuit and circuit for amplifying differential signal;
Power supply is connected with 3 pin of reference source D1 through resistance R1, resistance R4 is connected with between 1 pin of reference source D1 and 3 pin, resistance R10 is connected with between 1 pin of reference source D1 and 2 pin, the 2 pin ground connection of reference source D1,1 pin produce a reference voltage, and the output voltage of reference source D1 accesses the input voltage of sample circuit as sample circuit;
Sample circuit adopts Wheatstone bridge, and resistance R6, R7, R13 and platinum resistance thermometer sensor, PT100 form 4 brachium pontis of Wheatstone bridge, and resistance R6 connects with platinum resistance thermometer sensor, PT100, and resistance R7 connects with resistance R13, and two series circuits are in parallel again; Described platinum resistance thermometer sensor, PT100 is three-wire type, one end of platinum resistance thermometer sensor, PT100 draws that a wire is connected with resistance R6 by 1 pin of terminal J1, the other end draw two wires respectively by terminal J1 2 pin and 3 pin and resistance R13 and power supply be connected, the sampled signal access differential signal amplification circuit that sample circuit produces;
Circuit for amplifying differential signal comprises amplifier U1A, amplifier U1B and amplifier U1C, platinum resistance thermometer sensor, PT100 is connected with the in-phase input end of amplifier U1A by resistance R2, resistance R7 is connected with the in-phase input end of amplifier U1B by resistance R17, resistance R9 and resistance R12 is connected between the reverse input end of amplifier U1A and the inverting input of amplifier U1B, feedback resistance R8 is connected with between the reverse input end of amplifier U1A and output terminal, feedback resistance R14 is connected with between the reverse input end of amplifier U1B and output terminal, the output terminal of amplifier U1A connects power supply ground through resistance R3 and resistance R5, resistance R3 is connected with the in-phase input end of amplifier U1C with the dividing potential drop of resistance R5, the output terminal of amplifier U1B is connected with the reverse input end of amplifier U1C by resistance R15, feedback resistance R16 is connected with between the reverse input end of amplifier U1C and output terminal, the output terminal of amplifier U1C exports a voltage signal relevant to platinum resistance thermometer sensor, PT100 resistance through diode D2 and the electric capacity C1 of resistance R11 and earth.
2. temperature measurement circuit according to claim 1, is characterized in that: three wires of described platinum resistance thermometer sensor, PT100 adopt equal lengths, iso-cross-section amasss, etc. the wire of material.
3. temperature measurement circuit according to claim 1, is characterized in that: described reference source D1 is TL431; Resistance R6, R7 and R13 adopt Low Drift Temperature precision resistance; Circuit for amplifying differential signal adopts four high guaily unit integrated circuit LM324.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520919520.2U CN205102947U (en) | 2015-11-18 | 2015-11-18 | Three -way formula platinum resistance PT100 temperature detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520919520.2U CN205102947U (en) | 2015-11-18 | 2015-11-18 | Three -way formula platinum resistance PT100 temperature detection circuit |
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| CN205102947U true CN205102947U (en) | 2016-03-23 |
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| CN201520919520.2U Expired - Fee Related CN205102947U (en) | 2015-11-18 | 2015-11-18 | Three -way formula platinum resistance PT100 temperature detection circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106017715A (en) * | 2016-05-19 | 2016-10-12 | 浪潮电子信息产业股份有限公司 | Motor high temperature alarm and method implementing high temperature alarm |
| CN109030913A (en) * | 2018-08-27 | 2018-12-18 | 沃尔特电子（苏州）有限公司 | A kind of current detection means |
| CN109781292A (en) * | 2019-01-31 | 2019-05-21 | 大禹电气科技股份有限公司 | Three-wire system platinum resistance thermometer sensor, break detection circuit and detection device and detection method |
| CN113349464A (en) * | 2020-03-05 | 2021-09-07 | 日本烟草产业株式会社 | Power supply unit for aerosol inhaler |
-
2015
- 2015-11-18 CN CN201520919520.2U patent/CN205102947U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106017715A (en) * | 2016-05-19 | 2016-10-12 | 浪潮电子信息产业股份有限公司 | Motor high temperature alarm and method implementing high temperature alarm |
| CN109030913A (en) * | 2018-08-27 | 2018-12-18 | 沃尔特电子（苏州）有限公司 | A kind of current detection means |
| CN109781292A (en) * | 2019-01-31 | 2019-05-21 | 大禹电气科技股份有限公司 | Three-wire system platinum resistance thermometer sensor, break detection circuit and detection device and detection method |
| CN113349464A (en) * | 2020-03-05 | 2021-09-07 | 日本烟草产业株式会社 | Power supply unit for aerosol inhaler |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160323 Termination date: 20171118 |