CN203323910U - High-precision temperature signal measuring circuit - Google Patents
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Abstract
本实用新型涉及一种测温电路，属于电子技术领域。一种高精度温度信号测量电路，其主要特点在于包括有恒流源发生器的输出端连接带引线电阻抑制效应的温度信号检测电路的输入端,带引线电阻抑制效应的温度信号检测电路的输出端通过信号放大器与减法器的输入端连接，为被减数信号；0℃基准电压信号产生电路的输出端连接减法器另一个输入端，为减数信号；减法器的输出端电压为V0。本实用新型的优点是检测电路采用了带引线电阻抑制效应的温度信号检测电路，使得温度测量中的引线电阻影响被消除，且测温部件采用恒定电流的工作方式，功率损耗小，最终获得的含温度变化信息的测量电压与电阻的变化率成正比。本测温电路非常适于在工业现场进行有较长引线情况下的精密温度测量。
The utility model relates to a temperature measuring circuit, which belongs to the technical field of electronics. A high-precision temperature signal measurement circuit, its main feature is that the output end of the constant current source generator is connected to the input end of the temperature signal detection circuit with lead resistance suppression effect, and the output end of the temperature signal detection circuit with lead resistance suppression effect The signal amplifier is connected to the input end of the subtractor, which is the subtrahend signal; the output end of the 0°C reference voltage signal generating circuit is connected to the other input end of the subtractor, which is the subtrahend signal; the voltage at the output end of the subtractor is V 0 . The utility model has the advantage that the detection circuit adopts a temperature signal detection circuit with lead wire resistance suppression effect, so that the influence of lead wire resistance in temperature measurement is eliminated, and the temperature measuring part adopts the working mode of constant current, and the power loss is small, and finally obtained The measured voltage with temperature change information is proportional to the rate of change of resistance. This temperature measurement circuit is very suitable for precise temperature measurement in the case of long lead wires in industrial sites.
Description
技术领域： Technical field:
本实用新型涉及一种测温电路，属于电子技术领域。 The utility model relates to a temperature measuring circuit, which belongs to the technical field of electronics. the
背景技术： Background technique:
温度是用来表征物体冷热程度的物理量，使用温度传感器配合电子电路获得温度信号是温度检测的通用方法。但使用中，温度信号的转换电路与温度传感器探头的安装地点之间常因引线电阻带来的附加效应而使实际测量值偏高，该温度传感器的引线越长，这种影响就越明显。四川大学李龙等将恒流源原理应用到测温桥式电路中，采用单片机通过运算实现了对温度较为准确的测量，但该测温装置仅限于Pt100铂热电阻温度传感器引线较短的场合；大连交通大学王长友等采用非线性A／D转换器实现线性化补偿的设计方案，其提出的具有三线制导线电阻消除功能的测温仪表原理图调节点较多，实际操作中不易把握，且其介绍的的最佳线性化参数及最大非线性化误差的计算方法较为复杂，并不具有代表性。 Temperature is a physical quantity used to represent the degree of coldness and heat of an object. Using a temperature sensor with an electronic circuit to obtain a temperature signal is a common method for temperature detection. However, in use, the actual measured value is higher due to the additional effect of lead wire resistance between the temperature signal conversion circuit and the installation location of the temperature sensor probe. The longer the lead wire of the temperature sensor is, the more obvious this effect is. Li Long of Sichuan University applied the principle of constant current source to the temperature measuring bridge circuit, and realized the temperature measurement more accurately by using single-chip microcomputer through operation, but the temperature measuring device is limited to the occasion where the lead wire of the Pt100 platinum thermal resistance temperature sensor is short ; Wang Changyou of Dalian Jiaotong University and others used a nonlinear A/D converter to realize the design scheme of linearization compensation. The schematic diagram of the temperature measuring instrument with the function of eliminating the resistance of the three-wire wire system proposed by him has many adjustment points, which is difficult to grasp in actual operation, and The calculation methods of the optimal linearization parameters and the maximum nonlinearization error introduced by it are relatively complicated and not representative. the
发明内容： Invention content:
本实用新型的目的在于避免现有技术的缺陷，提出一种可以获得高精度温度信号的测量电路，通过设计一种特殊的电路构造，消除了普通测温电路中温度传感器的引线电阻对测量信号的影响，提高了温度测量的准确性。 The purpose of this utility model is to avoid the defects of the prior art, and propose a measurement circuit that can obtain high-precision temperature signals. By designing a special circuit structure, the resistance of the lead resistance of the temperature sensor in the ordinary temperature measurement circuit to the measurement signal is eliminated. The influence of this method improves the accuracy of temperature measurement. the
本实用新型的目的可以通过采用以下技术方案来实现：一种高精度温度信号测量电路，其主要特点在于包括有恒流源发生器的输出端连接带引线电阻抑制效应的温度信号检测电路的输入端,带引线电阻抑制效应的温度信号检测电路的输出端通过信号放大器与减法器的输入端连接，为被减数信号；0℃基准电压信号产生电路的输出端连接减法器另一个输入端，为减数信号，减法器的输出端电压为V0。 The purpose of this utility model can be achieved by adopting the following technical solutions: a high-precision temperature signal measurement circuit, whose main feature is to include an output terminal of a constant current source generator connected to an input terminal of a temperature signal detection circuit with a lead wire resistance suppression effect , the output end of the temperature signal detection circuit with lead resistance suppression effect is connected to the input end of the subtractor through the signal amplifier, which is the minuend signal; the output end of the 0°C reference voltage signal generation circuit is connected to the other input end of the subtractor, which is The subtrahend signal, the voltage at the output terminal of the subtractor is V 0 .
所述的高精度温度信号测量电路，所述的恒流源发生器包括有运算放大器A1的输出端6通过电阻R5与运算放大器A2的正输入端3连接，运算放大器A2的负输入端2与其输出端6连接,且运算放大器A2的输出端6与电阻R4一端连接，电阻R4另一端与电阻R3一端相连，电阻R3的另一端与参考电压源Vref连接，同时电阻R3与R4的连 接线与运算放大器A1的正输入端3相接，运算放大器A1的负输入端2通过电阻R1接地、通过电阻R2与其输出端6相连。
In the high-precision temperature signal measurement circuit, the constant current source generator includes an
所述的R1、R2、R3、R4阻值相等。 The resistance values of R1, R2, R3 and R4 are equal. the
所述的高精度温度信号测量电路，所述的带引线电阻抑制效应的温度信号检测电路包括包括有三线式温度传感器，电阻R8为温度传感器总电阻，RW1、RW2、RW3分别为所述的三线式温度传感器的三根现场连接线电阻，温度传感器总电阻R8的一端接连接线电阻RW2的一端，连接线电阻RW2的另一端接地，温度传感器的总电阻R8的另一端接连接线电阻RW1和RW3的一端，连接线电阻RW3的另一端和运算放大器A3的正输入端3相连，同时，连接线电阻RW1的另一端与电阻R6一端的连接线与运算放大器A2的正输入端3相连，电阻R6的另一端与运算放大器A3的负输入端2相连、并通过电阻R7与运算放大器A3的输出端6相连。
In the high-precision temperature signal measurement circuit, the temperature signal detection circuit with lead resistance suppression effect includes a three-wire temperature sensor, the resistor R8 is the total resistance of the temperature sensor, and RW1, RW2, and RW3 are the three-wire temperature sensors respectively. One end of the total resistance R8 of the temperature sensor is connected to one end of the connection line resistance RW2, the other end of the connection line resistance RW2 is grounded, and the other end of the total resistance R8 of the temperature sensor is connected to one end of the connection line resistance RW1 and RW3 , the other end of the connection line resistor RW3 is connected to the
所述的现场连接线电阻RW1、RW2、RW3阻值相等。 The resistors RW1, RW2 and RW3 of the field connecting wires have the same resistance value. the
所述的高精度温度信号测量电路，所述的信号放大器包括有运算放大器A3的输出端6连接放大器A5的3号输入端，放大器A5的8号端与1号端之间连接有放大倍数控制电阻RG，放大器A5的2号端连接的4号端接地；6号端为放大器A5的输出端。
In the high-precision temperature signal measurement circuit, the signal amplifier includes an
所述的高精度温度信号测量电路，所述的0℃基准电压信号产生电路包括有可调电位器R9，可调电位器R9的可调端连接运算放大器A4的正输入端3，运算放大器A4的负输入端2与输出端6相连接，构成电压跟随器。
In the high-precision temperature signal measurement circuit, the 0°C reference voltage signal generation circuit includes an adjustable potentiometer R9, the adjustable end of the adjustable potentiometer R9 is connected to the
所述的高精度温度信号测量电路，所述的减法器包括有放大器A5的输出端6与电阻R10相连，电阻R10的另一端与电阻R11一端连接，电阻R11的另一端接地，同时电阻R10与R11的连接线与运算放大器A6的正输入端3连接；运算放大器A4的输出端6与电阻R12相连，电阻R12的另一端与电阻R13一端连接，电阻R13的另一端与运算放大器A6的输出端6相连，同时电阻R12与电阻R13的连接线与运算放大器A6的负输入端2连接；运算放大器A6的输出端6最终产生的电压即为含温度变化信息的测量电压V0。
In the high-precision temperature signal measuring circuit, the subtractor includes the
所述的R10、R11、R12、R13阻值相等。 The resistance values of R10, R11, R12 and R13 are equal. the
本实用新型的有益效果是检测电路采用了带引线电阻抑制效应的温度信号检测电路，使得温度测量中的引线电阻影响被消除，且测温部件采用恒定电流的工作方式，功率损耗小，最终获得的含温度变化信息的测量电压与电阻的变化率成正比。本测温电路非常适于在工业现场进行有较长引线情况下的精密温度测量。 The beneficial effect of the utility model is that the detection circuit adopts a temperature signal detection circuit with lead wire resistance suppression effect, so that the influence of lead wire resistance in temperature measurement is eliminated, and the temperature measurement part adopts a constant current working mode, and the power loss is small, and finally obtains The measured voltage containing temperature change information is proportional to the rate of change of resistance. This temperature measurement circuit is very suitable for precise temperature measurement in the case of long lead wires in industrial sites. the
附图说明： Description of drawings:
图1本实用新型的结构框图 Fig. 1 structural block diagram of the utility model
图2基于三线式温度传感器的高精度温度信号测量电路图。 Figure 2 is a circuit diagram of a high-precision temperature signal measurement based on a three-wire temperature sensor. the
具体实施方式： Detailed ways:
以下结合附图所示之最佳实施例作进一步详述： Below in conjunction with the preferred embodiment shown in the accompanying drawings for further details:
实施例1:一种高精度温度信号测量电路，包括有恒流源发生器1的输出端连接带引线电阻抑制效应的温度信号检测电路2的输入端,带引线电阻抑制效应的温度信号检测电路2的输出端通过信号放大器4与减法器5的输入端连接，为被减数信号；0℃基准电压信号产生电路3的输出端连接减法器5另一个输入端，为减数信号，减法器5的输出端电压为V0。
Embodiment 1: a high-precision temperature signal measurement circuit, including the output end of the constant current source generator 1 connected to the input end of the temperature
所述的恒流源发生器1包括有运算放大器A1的输出端6通过电阻R5与运算放大器A2的正输入端3连接，运算放大器A2的负输入端2与其输出端6连接,且运算放大器A2的输出端6与电阻R4一端连接，电阻R4另一端与电阻R3一端相连，电阻R3的另一端与参考电压源Vref连接，同时电阻R3与R4的连接线同时与运算放大器A1的正输入端3相接，运算放大器A1的负输入端2通过电阻R1接地、通过电阻R2与其输出端6相连。
The constant current source generator 1 includes the
所述的R1、R2、R3、R4阻值相等。 The resistance values of R1, R2, R3 and R4 are equal. the
所述的带引线电阻抑制效应的温度信号检测电路2包括有三线式温度传感器，电阻R8为温度传感器总电阻，RW1、RW2、RW3分别为所述的三线式温度传感器的三根现场连接线电阻，温度传感器总电阻R8的一端接连接线电阻RW2的一端，连接线电阻RW2的另一端接地，温度传感器的总电阻R8的另一端接连接线电阻RW1和RW3的一端，连接线电阻RW3的另一端和运算放大器A3的正输入端3相连，同时，连接线电阻RW1的另一端与电阻R6一端的连接线与运算放大器A2的正输入端3相连，电阻R6的另一端与运算放大器A3的负输入端2相连、并通过电阻R7与运算放大器A3的输出端6相连。
The temperature
所述的现场连接线电阻RW1、RW2、RW3阻值相等。 The resistors RW1, RW2 and RW3 of the field connecting wires have the same resistance value. the
所述的信号放大器4包括有运算放大器A3的输出端6连接放大器A5的3号输入端，放大器A5的8号端与1号端之间连接有放大倍数控制电阻RG，放大器A5的2号端连 接的4号端接地；6号端为放大器A5的输出端。
The
所述的0℃基准电压信号产生电路3包括有可调电位器R9，可调电位器R9的可调端连接运算放大器A4的正输入端3，运算放大器A4的负输入端2与输出端6相连接，构成电压跟随器。
The 0°C reference voltage
所述的减法器5包括有放大器A5的输出端6与电阻R10相连，电阻R10的另一端与电阻R11一端连接，电阻R11的另一端接地，同时电阻R10与R11的连接线与运算放大器A6的正输入端3连接；运算放大器A4的输出端6与电阻R12相连，电阻R12的另一端与电阻R13一端连接，电阻R13的另一端与运算放大器A6的输出端6相连，同时电阻R12与电阻R13的连接线与运算放大器A6的负输入端2连接；运算放大器A6的输出端6最终产生的电压即为含温度变化信息的测量电压V0。
Described subtractor 5 comprises that the
所述的R10、R11、R12、R13阻值相等。 The resistance values of R10, R11, R12 and R13 are equal. the
实验例：选择一组具体参数为：R1-R4均选用100K/0.25W的精密电阻，参考电压源Vref选5.1V，R5选用5.1K/0.25W的精密电阻，则流过电阻R5的电流I即为1mA的恒流源；R6、R7均选用100K/0.25W的精密电阻，R8选用pt100铂热电阻温度传感器，如用σ表示该传感器的电阻相对于0℃变化率，则有某温度下pt100铂热电阻温度传感器的总电阻R8=100(1+σ)，使用时，R8所示的温度传感器位于测温现场，三根连接线从其端部引出，按图2所示的结构接入带引线电阻抑制效应的温度信号检测电路；RG选5.489K/0.25W的精密电阻，放大器A5选用AD620，则形成的信号放大器4的放大倍数为10；R9选用100K/1W的多圈精密可调电位器；R10-R13均选用100K/0.25W的精密电阻；电源+VCC及-VCC各选用+12V及-12V；运算放大器A1-A4、A6均选用OP07CP，则由图2可知，调整可调电位器R9的滑动端，使得可调电位器R9的可调端电压=10*0.1=1.0V，从而使V0=10σ，即减法器最终的含温度变化信息的测量电压V0与pt100铂热电阻温度传感器的电阻变化率σ成正比。由于在-200℃～+600℃范围内，pt100的电阻变化都有着非常好的线性度，为0.3851%/℃，因此，只要能够测得V0，就可以求得pt100铂热电阻温度传感器的电阻变化率σ，由此可以求得测量点温度偏离0℃的程度，即可以求得待测点的摄氏温度t值。设该电路某时刻测得V0=6.22V，则可以求得σ=62.2%，故实际温度t=σ/0.3851%/℃=62.2%/0.3851%/℃=161.52℃；又如某时刻测得V0=-1.4V，则可以求得σ=-14%，故实际温度t=σ/0.3851%/℃=-14%/0.3851%/℃=-36.35℃。
Experiment example: select a set of specific parameters: R1-R4 are all selected 100K/0.25W precision resistors, the reference voltage source Vref is selected 5.1V, R5 is selected 5.1K/0.25W precision resistors, then the current I flowing through the resistor R5 It is a constant current source of 1mA; both R6 and R7 use 100K/0.25W precision resistors, and R8 uses a pt100 platinum thermal resistance temperature sensor. The total resistance of the pt100 platinum thermal resistance temperature sensor is R8=100(1+σ). When in use, the temperature sensor indicated by R8 is located at the temperature measurement site, and three connecting wires are drawn from its end, and connected according to the structure shown in Figure 2 Temperature signal detection circuit with lead wire resistance suppression effect; R G selects 5.489K/0.25W precision resistor, amplifier A5 selects AD620, then the magnification factor of the formed
以上所述仅为本实用新型的较佳实施例，并不用以限制本实用新型，凡在本实用新 型的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本实用新型的保护范围之内。 The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model should be included in the Within the protection scope of the present utility model. the
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105738004A (en) * | 2014-12-10 | 2016-07-06 | 中车大连电力牵引研发中心有限公司 | Temperature measurement method and circuit |
| CN104614589A (en) * | 2015-01-19 | 2015-05-13 | 浙江中控自动化仪表有限公司 | Lead-resistance-removed resistance signal source and resistance measuring circuit thereof |
| CN104614589B (en) * | 2015-01-19 | 2017-07-28 | 浙江中控自动化仪表有限公司 | Resistance signal source and its resistance measuring circuit that a kind of lead resistance is eliminated |
| CN106248240A (en) * | 2016-08-15 | 2016-12-21 | 成都众山科技有限公司 | A kind of temperature transmitter with temperature-compensating |
| CN106248240B (en) * | 2016-08-15 | 2018-12-11 | 成都众山科技有限公司 | A kind of temperature transmitter with temperature-compensating |
| CN107560762A (en) * | 2017-09-06 | 2018-01-09 | 阳光电源股份有限公司 | A kind of PT100 resistance temperature measurements method and system |
| CN108318531A (en) * | 2018-03-20 | 2018-07-24 | 淮阴工学院 | The portable PH meters that a kind of included water bath with thermostatic control and form are shown |
| CN111238673A (en) * | 2020-01-06 | 2020-06-05 | 宁波中车时代传感技术有限公司 | Measuring circuit of film temperature sensor |
| US12222251B2 (en) | 2020-01-06 | 2025-02-11 | Ningbo CRRC Times Transducer Technology Co., Ltd. | Measurement circuit of thin-film temperature sensor |
| CN111521285A (en) * | 2020-04-30 | 2020-08-11 | 深圳芯能半导体技术有限公司 | High-voltage integrated circuit and temperature detection circuit thereof |
| CN111521285B (en) * | 2020-04-30 | 2022-01-14 | 深圳芯能半导体技术有限公司 | High-voltage integrated circuit and temperature detection circuit thereof |
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