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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- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 229910052697 platinum Inorganic materials 0.000 title claims abstract description 27
- 238000009529 body temperature measurement Methods 0.000 title claims abstract description 26
- 238000005259 measurement Methods 0.000 claims abstract description 7
- 238000005070 sampling Methods 0.000 abstract description 21
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 abstract description 4
- 239000003990 capacitor Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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Abstract
本实用新型涉及一种铂热电阻PT100的测温电路，包括：恒流源、铂热电阻PT100和采样计算电路；恒流源与PT100的两端连接；采样计算电路包括：两个跟随电路、一个差分放大器和两个电阻；PT100的两端分别通过一个电阻连接一个跟随电路，两个跟随电路分别用于测量PT100对应端的电压；差分放大器的正输入端和负输入端分别连接一个跟随电路的输出端，用于根据两个跟随电路测量得到的电压确定PT100的电压值；两个电阻为高阻值电阻，两个跟随电路为高阻抗跟随电路，从而提高采样计算电路的输入阻抗，避免对恒流源电路进行分流，极大地降低PT100的引线阻值对温度测量值的影响，提高测温电路的测量精度。
The utility model relates to a temperature measuring circuit of a platinum thermal resistance PT100, comprising: a constant current source, a platinum thermal resistance PT100 and a sampling calculation circuit; the constant current source is connected to both ends of the PT100; the sampling calculation circuit includes: two following circuits, A differential amplifier and two resistors; both ends of the PT100 are respectively connected to a follower circuit through a resistor, and the two follower circuits are used to measure the voltage at the corresponding end of the PT100; the positive input terminal and negative input terminal of the differential amplifier are respectively connected to a follower circuit. The output terminal is used to determine the voltage value of PT100 according to the voltage measured by the two follower circuits; the two resistors are high-resistance resistors, and the two follower circuits are high-impedance follower circuits, thereby increasing the input impedance of the sampling calculation circuit and avoiding The constant current source circuit divides the current, which greatly reduces the influence of the lead wire resistance of PT100 on the temperature measurement value, and improves the measurement accuracy of the temperature measurement circuit.
Description
技术领域technical field
本实用新型涉及测温技术领域，尤其涉及一种铂热电阻PT100的测温电路。The utility model relates to the technical field of temperature measurement, in particular to a temperature measurement circuit of a platinum thermal resistance PT100.
背景技术Background technique
目前，在轨道交通行业中，经常需要对变流器IGBT散热基板、水冷系统水温等一些关键的温度进行监测。现有技术中，监测上述温度的方法主要为：将铂热电阻PT100放置到水冷系统中或散热基板上，将电流源串入PT100回路，电流源的电流流过PT100回路产生电压，通过AD采集PT100回路电压进行温度测量。At present, in the rail transit industry, it is often necessary to monitor some key temperatures such as the converter IGBT heat dissipation substrate and the water temperature of the water cooling system. In the prior art, the method of monitoring the above temperature is mainly as follows: placing the platinum thermal resistance PT100 in the water cooling system or on the heat dissipation substrate, connecting the current source in series with the PT100 loop, the current of the current source flows through the PT100 loop to generate a voltage, which is collected by AD PT100 loop voltage for temperature measurement.
然而，现有技术中，测量得到的电压包括PT100和导线两部分的电压，结果需要根据导线电阻进行校准，导线电阻发生变化，会导致测量到的温度有误差，影响测温电路的测量精度。However, in the prior art, the measured voltage includes the voltage of the PT100 and the wire. The result needs to be calibrated according to the resistance of the wire. Changes in the resistance of the wire will cause errors in the measured temperature and affect the measurement accuracy of the temperature measurement circuit.
实用新型内容Utility model content
本实用新型提供一种铂热电阻PT100的测温电路，用于解决现有技术中测温电路的测量精度不高的问题。The utility model provides a temperature measuring circuit of a platinum thermal resistance PT100, which is used to solve the problem of low measurement accuracy of the temperature measuring circuit in the prior art.
本实用新型的第一个方面是提供一种铂热电阻PT100的测温电路，包括：The first aspect of the utility model is to provide a temperature measuring circuit of a platinum thermal resistance PT100, including:
恒流源、铂热电阻PT100和采样计算电路；Constant current source, platinum thermal resistance PT100 and sampling calculation circuit;
所述恒流源与所述PT100的两端连接；The constant current source is connected to both ends of the PT100;
所述采样计算电路包括：两个跟随电路、一个差分放大器和两个电阻；The sampling calculation circuit includes: two follower circuits, a differential amplifier and two resistors;
所述PT100的两端分别通过一个电阻连接一个跟随电路，所述PT100与所述跟随电路的正输入端连接，所述两个跟随电路分别用于测量PT100对应端的电压；The two ends of the PT100 are respectively connected to a follower circuit through a resistor, the PT100 is connected to the positive input terminal of the follower circuit, and the two follower circuits are respectively used to measure the voltage at the corresponding end of the PT100;
所述差分放大器的正输入端和负输入端分别连接一个所述跟随电路的输出端，用于根据所述两个跟随电路测量得到的电压确定所述PT100的电压值；The positive input terminal and the negative input terminal of the differential amplifier are respectively connected to the output terminal of one of the follower circuits, and are used to determine the voltage value of the PT100 according to the voltage measured by the two follower circuits;
所述两个电阻的阻值分别大于第一预设值，所述两个跟随电路的阻抗分别大于第二预设值，以使所述采样计算电路的输入阻抗大于第三预设值。The resistance values of the two resistors are respectively greater than a first preset value, and the impedances of the two follower circuits are respectively greater than a second preset value, so that the input impedance of the sampling calculation circuit is greater than a third preset value.
进一步地，所述恒流源包括：参考电源、五个电阻、第一运算放大器和第二运算放大器；Further, the constant current source includes: a reference power supply, five resistors, a first operational amplifier and a second operational amplifier;
所述参考电源通过一个电阻与所述第一运算放大器的正输入端连接；所述第二运算放大器的输出端通过一个电阻与所述第一运算放大器的正输入端连接；所述第一运算放大器的输出端通过一个电阻与所述PT100的一端连接；所述第一运算放大器的负输入端通过一个电阻接地；所述第一运算放大器的负输入端通过一个电阻与所述第一运算放大器的输出端连接；The reference power supply is connected to the positive input terminal of the first operational amplifier through a resistor; the output terminal of the second operational amplifier is connected to the positive input terminal of the first operational amplifier through a resistor; the first operational amplifier The output terminal of the amplifier is connected to one end of the PT100 through a resistor; the negative input terminal of the first operational amplifier is grounded through a resistor; the negative input terminal of the first operational amplifier is connected to the first operational amplifier through a resistor The output terminal connection;
所述参考电源与所述PT100的另一端连接。The reference power supply is connected to the other end of the PT100.
进一步地，所述参考电源为基准电源芯片。Further, the reference power supply is a reference power supply chip.
进一步地，所述基准电源芯片提供的电压的精度大于第四预设值。Further, the accuracy of the voltage provided by the reference power supply chip is greater than a fourth preset value.
进一步地，所述五个电阻的精度大于第五预设值。Further, the accuracy of the five resistors is greater than the fifth preset value.
进一步地，所述五个电阻的温漂小于第六预设值。Further, the temperature drift of the five resistors is smaller than the sixth preset value.
进一步地，所述PT100的两端分别设置有2个引线接头，所述PT100每端的2个引线接头分别用于连接所述恒流源和所述采样计算电路。Further, two lead connectors are respectively provided at both ends of the PT100, and the two lead connectors at each end of the PT100 are respectively used to connect the constant current source and the sampling calculation circuit.
本实用新型中，提供一种铂热电阻PT100的测温电路，包括：恒流源、铂热电阻PT100和采样计算电路；恒流源与PT100的两端连接；采样计算电路包括：两个跟随电路、一个差分放大器和两个电阻；PT100的两端分别通过一个电阻连接一个跟随电路，两个跟随电路分别用于测量PT100对应端的电压；差分放大器的正输入端和负输入端分别连接一个跟随电路的输出端，用于根据两个跟随电路测量得到的电压确定PT100的电压值；两个电阻为高阻值电阻，两个跟随电路为高阻抗跟随电路，从而提高采样计算电路的输入阻抗，避免对恒流源电路进行分流，极大地降低PT100的引线阻值对温度测量值的影响，提高测温电路的测量精度。In the utility model, a temperature measurement circuit of a platinum thermal resistance PT100 is provided, including: a constant current source, a platinum thermal resistance PT100 and a sampling calculation circuit; the constant current source is connected to both ends of the PT100; the sampling calculation circuit includes: two following circuit, a differential amplifier and two resistors; the two ends of the PT100 are respectively connected to a follower circuit through a resistor, and the two follower circuits are respectively used to measure the voltage at the corresponding end of the PT100; the positive input terminal and negative input terminal of the differential amplifier are respectively connected to a follower circuit The output terminal of the circuit is used to determine the voltage value of PT100 according to the voltage measured by the two follower circuits; the two resistors are high-resistance resistors, and the two follower circuits are high-impedance follower circuits, thereby increasing the input impedance of the sampling calculation circuit, Avoid shunting the constant current source circuit, greatly reduce the influence of the lead wire resistance of PT100 on the temperature measurement value, and improve the measurement accuracy of the temperature measurement circuit.
附图说明Description of drawings
图1为本实用新型提供的铂热电阻PT100的测温电路的电路图。Fig. 1 is the circuit diagram of the temperature measurement circuit of the platinum thermal resistance PT100 that the utility model provides.
具体实施方式detailed description
为使本实用新型实施例的目的、技术方案和优点更加清楚，下面将结合本实用新型实施例中的附图，对本实用新型实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本实用新型一部分实施例，而不是全部的实施例。基于本实用新型中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本实用新型保护的范围。In order to make the purpose, technical solutions and advantages of the embodiments of the utility model more clear, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the utility model. Obviously, the described The embodiments are some embodiments of the present utility model, but not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.
图1为本实用新型提供的铂热电阻PT100的测温电路的电路图，如图1所示，包括：Fig. 1 is the circuit diagram of the temperature measurement circuit of the platinum thermal resistance PT100 that the utility model provides, as shown in Fig. 1, comprises:
恒流源1、铂热电阻PT1002和采样计算电路3；Constant current source 1, platinum thermal resistance PT1002 and sampling calculation circuit 3;
恒流源1与所述PT1002的两端连接；The constant current source 1 is connected to both ends of the PT1002;
采样计算电路3包括：两个跟随电路31、一个差分放大器32和两个电阻33；The sampling calculation circuit 3 includes: two follower circuits 31, a differential amplifier 32 and two resistors 33;
PT1002的两端分别通过一个电阻33连接一个跟随电路31，PT1002与跟随电路31的正输入端连接，两个跟随电路31分别用于测量PT1002对应端的电压；The two ends of the PT1002 are respectively connected to a follower circuit 31 through a resistor 33, the PT1002 is connected to the positive input terminal of the follower circuit 31, and the two follower circuits 31 are respectively used to measure the voltage at the corresponding end of the PT1002;
差分放大器32的正输入端和负输入端分别连接一个跟随电路31的输出端，用于根据两个跟随电路32测量得到的电压确定PT1002的电压值；The positive input terminal and the negative input terminal of the differential amplifier 32 are respectively connected to the output terminal of a follower circuit 31 for determining the voltage value of the PT1002 according to the voltage measured by the two follower circuits 32;
两个电阻33的阻值分别大于第一预设值，两个跟随电路31的阻抗分别大于第二预设值，以使采样计算电路3的输入阻抗大于第三预设值。The resistance values of the two resistors 33 are respectively larger than the first preset value, and the impedances of the two follower circuits 31 are respectively larger than the second preset value, so that the input impedance of the sampling calculation circuit 3 is larger than the third preset value.
其中，铂热电阻的阻值会随着温度的变化而改变。PT100为0摄氏度时阻值为100欧姆的铂热电阻。PT100的阻值会随着温度上升而成近似匀速的增长。PT100的两端分别设置有2个引线接头，PT100每端的2个引线接头分别用于连接恒流源和采样计算电路。恒流源1用于为PT100提供电流，以便测量PT100的阻值。采样计算电路3用于在电流通过PT100时，测得PT100两端的电压，以便根据电压确定PT100的阻值，进而确定PT100的温度值。Among them, the resistance value of platinum thermal resistance will change with the change of temperature. PT100 is a platinum thermal resistance with a resistance of 100 ohms at 0 degrees Celsius. The resistance value of PT100 will increase approximately at a constant speed as the temperature rises. Two lead connectors are provided at both ends of the PT100, and the two lead connectors at each end of the PT100 are respectively used to connect the constant current source and the sampling calculation circuit. Constant current source 1 is used to provide current for PT100 so as to measure the resistance value of PT100. The sampling calculation circuit 3 is used to measure the voltage across the PT100 when the current passes through the PT100, so as to determine the resistance value of the PT100 according to the voltage, and then determine the temperature value of the PT100.
其中，采样计算电路3还可以包括3个电阻。一个电阻设置在差分放大器32的正输入端所连接的跟随电路31与差分放大器32之间；一个电阻设置在差分放大器32的正输入端与输出端之间；一个电阻设置在差分放大器32的输出端，且该电阻通过电容接地。Wherein, the sampling calculation circuit 3 may also include 3 resistors. A resistor is arranged between the follower circuit 31 and the differential amplifier 32 connected to the positive input of the differential amplifier 32; a resistor is arranged between the positive input and the output of the differential amplifier 32; a resistor is arranged at the output of the differential amplifier 32 terminal, and this resistor is connected to ground through a capacitor.
采样计算电路3测量PT100两端的电压的方法主要为：由两个跟随电路31测得PT100两个端的电压，由差分放大器32对两个跟随电路31测得的电压做减法处理，计算得到PT100两端的电压。The method for measuring the voltage at both ends of the PT100 by the sampling calculation circuit 3 is mainly as follows: the voltages at the two ends of the PT100 are measured by two follower circuits 31, and the differential amplifier 32 performs subtraction processing on the voltages measured by the two follower circuits 31 to calculate the two ends of the PT100. terminal voltage.
第一预设值、第二预设值以及第三预设值的设定可以为使得测温电路的精度达到一定值的值。例如，第一预设值和第二预设值可以为数千欧姆。第一预设值、第二预设值以及第三预设值足够高，可以使得两个电阻33以及两个跟随电路31的总的阻抗足够高，从而极大地提高采样计算电路的输入阻抗，避免对恒流源电路进行分流，极大地降低PT100的引线阻值对温度测量值的影响，提高测温电路的测量精度。The setting of the first preset value, the second preset value and the third preset value may be values that make the accuracy of the temperature measuring circuit reach a certain value. For example, the first preset value and the second preset value may be thousands of ohms. The first preset value, the second preset value and the third preset value are high enough to make the total impedance of the two resistors 33 and the two follower circuits 31 high enough, thereby greatly improving the input impedance of the sampling calculation circuit, Avoid shunting the constant current source circuit, greatly reduce the influence of the lead wire resistance of PT100 on the temperature measurement value, and improve the measurement accuracy of the temperature measurement circuit.
进一步地，恒流源1包括：参考电源11、五个电阻12、第一运算放大器13和第二运算放大器14；Further, the constant current source 1 includes: a reference power supply 11, five resistors 12, a first operational amplifier 13 and a second operational amplifier 14;
参考电源11通过一个电阻12与第一运算放大器13的正输入端连接；第二运算放大器14的输出端通过一个电阻12与第一运算放大器13的正输入端连接；第一运算放大器13的输出端通过一个电阻12与PT100的一端连接；第一运算放大器13的负输入端通过一个电阻12接地；第一运算放大器13的负输入端通过一个电阻12与第一运算放大器13的输出端连接；The reference power supply 11 is connected with the positive input terminal of the first operational amplifier 13 through a resistor 12; the output terminal of the second operational amplifier 14 is connected with the positive input terminal of the first operational amplifier 13 through a resistor 12; the output of the first operational amplifier 13 terminal is connected with one end of PT100 through a resistor 12; the negative input terminal of the first operational amplifier 13 is grounded through a resistor 12; the negative input terminal of the first operational amplifier 13 is connected with the output terminal of the first operational amplifier 13 through a resistor 12;
参考电源11与PT100的另一端连接。The reference power supply 11 is connected to the other end of the PT100.
其中，参考电源11具体可以为基准电源芯片。为了保证基准电源芯片提供的参考电源11的稳定性，基准电源芯片提供的电压的精度大于第四预设值。Wherein, the reference power supply 11 may specifically be a reference power supply chip. In order to ensure the stability of the reference power supply 11 provided by the reference power supply chip, the accuracy of the voltage provided by the reference power supply chip is greater than the fourth preset value.
具体地，参考电源11具体可以通过电容与PT100的另一端连接。参考电源11通过电容接地。Specifically, the reference power supply 11 may be connected to the other end of the PT100 through a capacitor. The reference power supply 11 is grounded through a capacitor.
进一步地，为了保证参考电源11的稳定性，五个电阻的精度可以大于第五预设值。五个电阻的温漂可以小于第六预设值。Further, in order to ensure the stability of the reference power supply 11, the accuracy of the five resistors may be greater than the fifth preset value. The temperature drift of the five resistors may be less than the sixth preset value.
另外，由于本实施例提供的铂热电阻PT100的测温电路仅用到PT100、放大器、电阻等器件，上述器件的耐用性较高，因此，本实施例提供的铂热电阻PT100的测温电路的成本较低，使用时间较长，为生产带来便利。In addition, since the temperature measurement circuit of the platinum thermal resistance PT100 provided in this embodiment only uses PT100, amplifiers, resistors and other devices, the durability of the above devices is high, therefore, the temperature measurement circuit of the platinum thermal resistance PT100 provided in this embodiment The cost is lower and the service time is longer, which brings convenience to production.
本实施例中，提供一种铂热电阻PT100的测温电路，包括：恒流源、铂热电阻PT100和采样计算电路；恒流源与PT100的两端连接；采样计算电路包括：两个跟随电路、一个差分放大器和两个电阻；PT100的两端分别通过一个电阻连接一个跟随电路，两个跟随电路分别用于测量PT100对应端的电压；差分放大器的正输入端和负输入端分别连接一个跟随电路的输出端，用于根据两个跟随电路测量得到的电压确定PT100的电压值；两个电阻为高阻值电阻，两个跟随电路为高阻抗跟随电路，从而提高采样计算电路的输入阻抗，避免对恒流源电路进行分流，极大地降低PT100的引线阻值对温度测量值的影响，提高测温电路的测量精度。In the present embodiment, a temperature measurement circuit of a platinum thermal resistance PT100 is provided, comprising: a constant current source, a platinum thermal resistance PT100 and a sampling calculation circuit; the constant current source is connected to both ends of the PT100; the sampling calculation circuit includes: two following circuit, a differential amplifier and two resistors; the two ends of the PT100 are respectively connected to a follower circuit through a resistor, and the two follower circuits are respectively used to measure the voltage at the corresponding end of the PT100; the positive input terminal and negative input terminal of the differential amplifier are respectively connected to a follower circuit The output terminal of the circuit is used to determine the voltage value of PT100 according to the voltage measured by the two follower circuits; the two resistors are high-resistance resistors, and the two follower circuits are high-impedance follower circuits, thereby increasing the input impedance of the sampling calculation circuit, Avoid shunting the constant current source circuit, greatly reduce the influence of the lead wire resistance of PT100 on the temperature measurement value, and improve the measurement accuracy of the temperature measurement circuit.
最后应说明的是：以上各实施例仅用以说明本实用新型的技术方案，而非对其限制；尽管参照前述各实施例对本实用新型进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本实用新型各实施例技术方案的范围。Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, and are not intended to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand : It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements to some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the various embodiments of the present invention Scope of technical solutions.
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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 |
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2014
- 2014-12-15 CN CN201420801697.8U patent/CN204514495U/en not_active Expired - Lifetime
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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