CN204514495U - The temperature measurement circuit of platinum resistance thermometer sensor, PT100 - Google Patents
The temperature measurement circuit of platinum resistance thermometer sensor, PT100 Download PDFInfo
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- CN204514495U CN204514495U CN201420801697.8U CN201420801697U CN204514495U CN 204514495 U CN204514495 U CN 204514495U CN 201420801697 U CN201420801697 U CN 201420801697U CN 204514495 U CN204514495 U CN 204514495U
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Abstract
The utility model relates to the temperature measurement circuit of a kind of platinum resistance thermometer sensor, PT100, comprising: constant current source, platinum resistance thermometer sensor, PT100 and sample-taking calculating circuit; Constant current source is connected with the two ends of PT100; Sample-taking calculating circuit comprises: two follow circuits, a differential amplifier and two resistance; The two ends of PT100 connect a follow circuit respectively by a resistance, and two follow circuits are respectively used to the voltage measuring PT100 corresponding end; Positive input terminal and the negative input end of differential amplifier are connected the output terminal of a follow circuit respectively, and the voltage for obtaining according to two follow circuit measurements determines the magnitude of voltage of PT100; Two resistance are high resistance measurement, two follow circuits are high impedance follow circuit, thus improve the input impedance of sample-taking calculating circuit, avoid shunting constant-current source circuit, greatly reduce the lead-in wire resistance of PT100 to the impact of measured temperature, improve the measuring accuracy of temperature measurement circuit.
Description
Technical field
The utility model relates to thermometry field, particularly relates to the temperature measurement circuit of a kind of platinum resistance thermometer sensor, PT100.
Background technology
At present, in track transportation industry, often need to monitor the temperature of some keys such as current transformer IGBT heat-radiating substrate, water-cooling system water temperature.In prior art, the method of monitoring said temperature is mainly: be placed in water-cooling system or on heat-radiating substrate by platinum resistance thermometer sensor, PT100, current source is sealed in PT100 loop, the electric current of current source flows through PT100 loop and produces voltage, gathers PT100 loop voltage carry out temperature survey by AD.
But in prior art, measure the voltage obtained and comprise PT100 and the two-part voltage of wire, result needs to calibrate according to conductor resistance, and conductor resistance changes, and the temperature measured can be caused to have error, affect the measuring accuracy of temperature measurement circuit.
Utility model content
The utility model provides the temperature measurement circuit of a kind of platinum resistance thermometer sensor, PT100, the problem that the measuring accuracy for solving temperature measurement circuit in prior art is not high.
First aspect of the present utility model is to provide the temperature measurement circuit of a kind of platinum resistance thermometer sensor, PT100, comprising:
Constant current source, platinum resistance thermometer sensor, PT100 and sample-taking calculating circuit;
Described constant current source is connected with the two ends of described PT100;
Described sample-taking calculating circuit comprises: two follow circuits, a differential amplifier and two resistance;
The two ends of described PT100 connect a follow circuit respectively by a resistance, and described PT100 is connected with the positive input terminal of described follow circuit, and described two follow circuits are respectively used to the voltage measuring PT100 corresponding end;
Positive input terminal and the negative input end of described differential amplifier are connected the output terminal of a described follow circuit respectively, and the voltage for obtaining according to described two follow circuit measurements determines the magnitude of voltage of described PT100;
The resistance of described two resistance is greater than the first preset value respectively, and the impedance of described two follow circuits is greater than the second preset value respectively, is greater than the 3rd preset value to make the input impedance of described sample-taking calculating circuit.
Further, described constant current source comprises: reference power source, five resistance, the first operational amplifier and the second operational amplifiers;
Described reference power source is connected with the positive input terminal of described first operational amplifier by a resistance; The output terminal of described second operational amplifier is connected with the positive input terminal of described first operational amplifier by a resistance; The output terminal of described first operational amplifier is connected with one end of described PT100 by a resistance; The negative input end of described first operational amplifier is by a resistance eutral grounding; The negative input end of described first operational amplifier is connected with the output terminal of described first operational amplifier by a resistance;
Described reference power source is connected with the other end of described PT100.
Further, described reference power source is reference power supply chip.
Further, the precision of voltage that described reference power supply chip provides is greater than the 4th preset value.
Further, the precision of described five resistance is greater than the 5th preset value.
Further, the temperature drift of described five resistance is less than the 6th preset value.
Further, the two ends of described PT100 are respectively arranged with 2 pigtail splices, and 2 pigtail splices that described PT100 often holds are respectively used to connect described constant current source and described sample-taking calculating circuit.
In the utility model, the temperature measurement circuit of a kind of platinum resistance thermometer sensor, PT100 is provided, comprises: constant current source, platinum resistance thermometer sensor, PT100 and sample-taking calculating circuit; Constant current source is connected with the two ends of PT100; Sample-taking calculating circuit comprises: two follow circuits, a differential amplifier and two resistance; The two ends of PT100 connect a follow circuit respectively by a resistance, and two follow circuits are respectively used to the voltage measuring PT100 corresponding end; Positive input terminal and the negative input end of differential amplifier are connected the output terminal of a follow circuit respectively, and the voltage for obtaining according to two follow circuit measurements determines the magnitude of voltage of PT100; Two resistance are high resistance measurement, two follow circuits are high impedance follow circuit, thus improve the input impedance of sample-taking calculating circuit, avoid shunting constant-current source circuit, greatly reduce the lead-in wire resistance of PT100 to the impact of measured temperature, improve the measuring accuracy of temperature measurement circuit.
Accompanying drawing explanation
The circuit diagram of the temperature measurement circuit of the platinum resistance thermometer sensor, PT100 that Fig. 1 provides for the utility model.
Embodiment
For making the object of the utility model embodiment, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the utility model embodiment, technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
The circuit diagram of the temperature measurement circuit of the platinum resistance thermometer sensor, PT100 that Fig. 1 provides for the utility model, as shown in Figure 1, comprising:
Constant current source 1, platinum resistance thermometer sensor, PT1002 and sample-taking calculating circuit 3;
Constant current source 1 is connected with the two ends of described PT1002;
Sample-taking calculating circuit 3 comprises: two follow circuits, 31, differential amplifier 32 and two resistance 33;
The two ends of PT1002 connect a follow circuit 31, PT1002 respectively by a resistance 33 and are connected with the positive input terminal of follow circuit 31, and two follow circuits 31 are respectively used to the voltage measuring PT1002 corresponding end;
Positive input terminal and the negative input end of differential amplifier 32 are connected the output terminal of a follow circuit 31 respectively, for measuring according to two follow circuits 32 magnitude of voltage that the voltage obtained determines PT1002;
The resistance of two resistance 33 is greater than the first preset value respectively, and the impedance of two follow circuits 31 is greater than the second preset value respectively, is greater than the 3rd preset value to make the input impedance of sample-taking calculating circuit 3.
Wherein, the resistance of platinum resistance thermometer sensor, can change along with the change of temperature.When PT100 is 0 degree Celsius, resistance is the platinum resistance thermometer sensor, of 100 ohm.The resistance of PT100 can form approximate growth at the uniform velocity along with temperature rises.The two ends of PT100 are respectively arranged with 2 pigtail splices, and 2 pigtail splices that PT100 often holds are respectively used to connect constant current source and sample-taking calculating circuit.Constant current source 1 for providing electric current for PT100, to measure the resistance of PT100.Sample-taking calculating circuit 3, for when electric current is by PT100, records the voltage at PT100 two ends, to determine the resistance of PT100 according to voltage, and then determines the temperature value of PT100.
Wherein, sample-taking calculating circuit 3 can also comprise 3 resistance.Between the follow circuit 31 that the positive input terminal that resistance is arranged on differential amplifier 32 connects and differential amplifier 32; Between the positive input terminal that resistance is arranged on differential amplifier 32 and output terminal; A resistance is arranged on the output terminal of differential amplifier 32, and this resistance passes through capacity earth.
The method that sample-taking calculating circuit 3 measures the voltage at PT100 two ends is mainly: the voltage being recorded PT100 two end by two follow circuits 31, by differential amplifier 32, subtraction process is done to the voltage that two follow circuits 31 record, calculate the voltage at PT100 two ends.
The setting of the first preset value, the second preset value and the 3rd preset value can for the value making the precision of temperature measurement circuit reach certain value.Such as, the first preset value and the second preset value can be several thousand ohms.First preset value, the second preset value and the 3rd preset value are enough high, total impedance of two resistance 33 and two follow circuits 31 can be made enough high, thus greatly improve the input impedance of sample-taking calculating circuit, avoid shunting constant-current source circuit, greatly reduce the lead-in wire resistance of PT100 to the impact of measured temperature, improve the measuring accuracy of temperature measurement circuit.
Further, constant current source 1 comprises: reference power source 11, five resistance 12, first operational amplifiers 13 and the second operational amplifier 14;
Reference power source 11 is connected with the positive input terminal of the first operational amplifier 13 by a resistance 12; The output terminal of the second operational amplifier 14 is connected with the positive input terminal of the first operational amplifier 13 by a resistance 12; The output terminal of the first operational amplifier 13 is connected with one end of PT100 by a resistance 12; The negative input end of the first operational amplifier 13 is by resistance 12 ground connection; The negative input end of the first operational amplifier 13 is connected with the output terminal of the first operational amplifier 13 by a resistance 12;
Reference power source 11 is connected with the other end of PT100.
Wherein, reference power source 11 is specifically as follows reference power supply chip.In order to ensure the stability of the reference power source 11 that reference power supply chip provides, the precision of the voltage that reference power supply chip provides is greater than the 4th preset value.
Particularly, reference power source 11 specifically can be connected with the other end of PT100 by electric capacity.Reference power source 11 passes through capacity earth.
Further, in order to ensure the stability of reference power source 11, the precision of five resistance can be greater than the 5th preset value.The temperature drift of five resistance can be less than the 6th preset value.
In addition, the temperature measurement circuit of the platinum resistance thermometer sensor, PT100 provided due to the present embodiment only uses the devices such as PT100, amplifier, resistance, the durability of above-mentioned device is higher, therefore, the cost of the temperature measurement circuit of the platinum resistance thermometer sensor, PT100 that the present embodiment provides is lower, service time is longer, offers convenience for producing.
In the present embodiment, the temperature measurement circuit of a kind of platinum resistance thermometer sensor, PT100 is provided, comprises: constant current source, platinum resistance thermometer sensor, PT100 and sample-taking calculating circuit; Constant current source is connected with the two ends of PT100; Sample-taking calculating circuit comprises: two follow circuits, a differential amplifier and two resistance; The two ends of PT100 connect a follow circuit respectively by a resistance, and two follow circuits are respectively used to the voltage measuring PT100 corresponding end; Positive input terminal and the negative input end of differential amplifier are connected the output terminal of a follow circuit respectively, and the voltage for obtaining according to two follow circuit measurements determines the magnitude of voltage of PT100; Two resistance are high resistance measurement, two follow circuits are high impedance follow circuit, thus improve the input impedance of sample-taking calculating circuit, avoid shunting constant-current source circuit, greatly reduce the lead-in wire resistance of PT100 to the impact of measured temperature, improve the measuring accuracy of temperature measurement circuit.
Last it is noted that above each embodiment is only in order to illustrate the technical solution of the utility model, be not intended to limit; Although be described in detail the utility model with reference to foregoing embodiments, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of each embodiment technical scheme of the utility model.
Claims (7)
1. a temperature measurement circuit of platinum resistance thermometer sensor, PT100, is characterized in that, comprising:
Constant current source, platinum resistance thermometer sensor, PT100 and sample-taking calculating circuit;
Described constant current source is connected with the two ends of described PT100;
Described sample-taking calculating circuit comprises: two follow circuits, a differential amplifier and two resistance;
The two ends of described PT100 connect a follow circuit respectively by a resistance, and described PT100 is connected with the positive input terminal of described follow circuit, and described two follow circuits are respectively used to the voltage measuring PT100 corresponding end;
Positive input terminal and the negative input end of described differential amplifier are connected the output terminal of a described follow circuit respectively, and the voltage for obtaining according to described two follow circuit measurements determines the magnitude of voltage of described PT100;
The resistance of described two resistance is greater than the first preset value respectively, and the impedance of described two follow circuits is greater than the second preset value respectively, is greater than the 3rd preset value to make the input impedance of described sample-taking calculating circuit.
2. the temperature measurement circuit of platinum resistance thermometer sensor, PT100 according to claim 1, is characterized in that,
Described constant current source comprises: reference power source, five resistance, the first operational amplifier and the second operational amplifiers;
Described reference power source is connected with the positive input terminal of described first operational amplifier by a resistance; The output terminal of described second operational amplifier is connected with the positive input terminal of described first operational amplifier by a resistance; The output terminal of described first operational amplifier is connected with one end of described PT100 by a resistance; The negative input end of described first operational amplifier is by a resistance eutral grounding; The negative input end of described first operational amplifier is connected with the output terminal of described first operational amplifier by a resistance;
Described reference power source is connected with the other end of described PT100.
3. the temperature measurement circuit of platinum resistance thermometer sensor, PT100 according to claim 2, is characterized in that,
Described reference power source is reference power supply chip.
4. the temperature measurement circuit of platinum resistance thermometer sensor, PT100 according to claim 3, is characterized in that,
The precision of the voltage that described reference power supply chip provides is greater than the 4th preset value.
5. the temperature measurement circuit of platinum resistance thermometer sensor, PT100 according to claim 2, is characterized in that,
The precision of five resistance in described constant current source is greater than the 5th preset value.
6. the temperature measurement circuit of the platinum resistance thermometer sensor, PT100 according to claim 2 or 5, is characterized in that,
The temperature drift of five resistance in described constant current source is less than the 6th preset value.
7. the temperature measurement circuit of platinum resistance thermometer sensor, PT100 according to claim 1, is characterized in that,
The two ends of described PT100 are respectively arranged with 2 pigtail splices, and 2 pigtail splices that described PT100 often holds are respectively used to connect described constant current source and described sample-taking calculating circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420801697.8U CN204514495U (en) | 2014-12-15 | 2014-12-15 | The temperature measurement circuit of platinum resistance thermometer sensor, PT100 |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420801697.8U CN204514495U (en) | 2014-12-15 | 2014-12-15 | The temperature measurement circuit of platinum resistance thermometer sensor, PT100 |
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| CN204514495U true CN204514495U (en) | 2015-07-29 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105758548A (en) * | 2014-12-15 | 2016-07-13 | 中车大连电力牵引研发中心有限公司 | Temperature measurement circuit of platinum thermal resistor PT100 |
| CN111397756A (en) * | 2020-04-03 | 2020-07-10 | 江苏吉泰科电气股份有限公司 | Motor temperature detection circuit suitable for multiple sensor types |
-
2014
- 2014-12-15 CN CN201420801697.8U patent/CN204514495U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105758548A (en) * | 2014-12-15 | 2016-07-13 | 中车大连电力牵引研发中心有限公司 | Temperature measurement circuit of platinum thermal resistor PT100 |
| CN111397756A (en) * | 2020-04-03 | 2020-07-10 | 江苏吉泰科电气股份有限公司 | Motor temperature detection circuit suitable for multiple sensor types |
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Address after: 116045 Liaoning province Dalian City Lushun Economic Development Zone Dalian Hao Yang No. 1 North Street Patentee after: CRRC DALIAN ELECTRIC TRACTION R & D CENTER CO., LTD. Address before: 116045 Liaoning province Dalian City Lushun Economic Development Zone Dalian Hao Yang No. 1 North Street Patentee before: Co., Ltd of Bei Che Dalian Electric Traction R & D Center |