A temperature simulation measurement device and a temperature simulation measurement method

Abstract

The temperature simulation measurement device and simulation measurement method of the present invention belong to the field of industrial testing technology, and include a control terminal, a temperature simulation unit, a temperature measurement unit, a temperature measurement circuit and a temperature sensor; the temperature simulation unit and the temperature measurement unit are both electrically connected to the control terminal; the temperature simulation unit is electrically connected to the temperature measurement circuit; the temperature measurement unit is electrically connected to the temperature sensor. It can simultaneously realize the two functions of measurement circuit inspection and sensor inspection, and can flexibly set parameters through the control terminal, output a single temperature or temperature curve to perform temperature simulation, and can measure thermal resistance temperature sensors with different working characteristics such as Pt100 and Pt1000, thereby improving the working efficiency of simulation measurement.

Description

Technical Field

[0001] The invention belongs to the technical field of industrial testing, and in particular relates to a temperature simulation measurement device and a simulation measurement method. Background Art

[0002] Temperature measurement is a common process in industrial control, manufacturing, and production. Thermistor sensors are widely used due to their high measurement accuracy, wide temperature range, and stable performance. In order to test whether the temperature measurement circuit of the instrument is accurate and effective, a convenient method is to simulate the working characteristics of thermistor sensors and input equivalent signals into the measurement circuit to test and verify the measurement circuit. For production sites such as wind farms that are remote, have harsh environments, and have a large number of measurement points, in addition to the measurement circuit, timely inspection of sensors is also a major problem. Therefore, it is very necessary to provide a device that can simultaneously inspect the measurement circuit and the sensor. In addition, common temperature simulation devices can usually only output a single temperature value and cannot output a changing temperature curve to inspect the equipment. Therefore, it is necessary to provide a temperature simulation device that can flexibly set output parameters. Summary of the invention

[0003] The present invention aims to solve the above problems and provides a temperature simulation measurement device and a simulation measurement method.

[0004] The temperature simulation measurement device of the present invention comprises a control terminal, a temperature simulation unit, a temperature measurement unit, a temperature measurement circuit and a temperature sensor; the temperature simulation unit and the temperature measurement unit are both electrically connected to the control terminal; the temperature simulation unit is electrically connected to the temperature measurement circuit; the temperature measurement unit is electrically connected to the temperature sensor. The temperature simulation unit is used to simulate the working characteristics of the temperature sensor and output a temperature simulation signal; the temperature measurement unit is used to simulate the temperature measurement circuit and measure the temperature signal of the temperature sensor; the control terminal is used for parameter configuration, command issuance, signal transmission, signal reception, data storage, calculation analysis, data display and other functions in the temperature simulation measurement process.

[0005] The temperature simulation measuring device of the present invention, the temperature simulation unit includes a first digital / analog converter DAC and an I / V conversion unit; the control terminal is connected to the first digital / analog converter DAC; the temperature measurement loop is electrically connected to the first digital / analog converter DAC via the I / V conversion unit to form a loop. The I / V conversion unit is used to convert the signal output by the measurement loop into a signal usable by the first digital / analog converter DAC; the first digital / analog converter DAC is used to convert the temperature digital signal input by the control terminal into an analog signal of the temperature.

[0006] The temperature simulation measurement device of the present invention, the temperature measurement unit includes a second digital / analog converter DAC, a current control unit, an analog / digital converter ADC and a voltage follower unit; the aforementioned control terminal, the second digital / analog converter DAC, the current control unit and the temperature sensor are electrically connected in sequence; the temperature sensor, the voltage follower unit, the analog / digital converter ADC and the control terminal are electrically connected in sequence. The second digital / analog converter DAC is used to convert the excitation current digital signal input by the control terminal into an analog signal; the current control unit is used to convert the voltage analog signal output by the second digital / analog converter DAC into an excitation current signal as an excitation source for measuring the temperature of the sensor; the voltage tracking unit is used to measure the voltage value of the temperature sensor circuit under test; the analog / digital converter ADC is used to convert the voltage value of the sensor circuit under test into a digital signal and feed it back to the control terminal. The control terminal is used for parameter configuration, command issuance, signal transmission, signal reception, data storage, calculation analysis, data display and other functions in the temperature simulation measurement process.

[0007] The simulation measurement method of the temperature simulation measurement device of the present invention comprises a simulation method and a measurement method; the steps of the simulation method are: inputting a simulation temperature value or a temperature curve through a control terminal, controlling the output of a corresponding signal, and converting it through a temperature simulation unit so that the temperature measurement circuit measures an equivalent temperature value or a temperature change curve;

[0008] The steps of the measurement method are as follows: outputting an excitation current signal through a control terminal, which is then converted into an excitation current analog signal through a temperature measurement unit; the excitation current analog signal generates a voltage after passing through a temperature sensor, and the voltage value is fed back to the control terminal; the control terminal calculates the resistance value of the temperature sensor through the voltage-current relationship, and finally calculates the current temperature value of the temperature sensor through the temperature-resistance curve of the thermal resistor.

[0009] The simulation measurement method of the temperature simulation measurement device described in the present invention comprises the following steps: converting the temperature value signal inputted by the control terminal into an analog signal of the corresponding temperature value through a digital / analog converter DAC and transmitting the analog signal to the temperature measurement circuit, so that the temperature measurement circuit measures an equivalent temperature value; and converting the signal outputted by the measurement circuit into a usable signal of the digital / analog converter DAC through an I / V conversion unit.

[0010] The analog measurement method of the temperature analog measurement device of the present invention comprises the following steps: converting the excitation current digital signal input by the control terminal into a voltage analog signal through a second digital / analog converter DAC; converting the voltage analog signal output by the digital / analog converter DAC into an excitation current signal by a current control unit as an excitation source for measuring the temperature of a sensor; the excitation current signal generates a voltage through a temperature sensor; a voltage tracking unit measures the voltage value of a temperature sensor circuit under test; converting the voltage value of the sensor circuit under test into a digital signal through an analog / digital converter ADC, feeding it back to the control terminal, and calculating the current temperature value of the temperature sensor.

[0011] The temperature simulation measurement device and simulation measurement method of the present invention include a control terminal, a temperature simulation unit, a temperature measurement unit, a temperature measurement circuit and a temperature sensor; the temperature simulation unit and the temperature measurement unit are both electrically connected to the control terminal; the temperature simulation unit is electrically connected to the temperature measurement circuit; the temperature measurement unit is electrically connected to the temperature sensor. It can simultaneously realize the two functions of measurement circuit inspection and sensor inspection, and can flexibly set parameters through the control terminal, output a single temperature or temperature curve to perform temperature simulation, and can simultaneously measure thermal resistance temperature sensors with different working characteristics such as Pt100 and Pt1000, thereby improving the working efficiency of simulation measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic block diagram of the structure of the temperature simulation measurement device of the present invention;

[0013] Figure 2 is a schematic block diagram of the structure of the temperature simulation unit of the present invention;

[0014] Figure 3 is a schematic block diagram of the structure of the temperature measurement unit of the present invention;

[0015] Figure 4 This is a structural diagram of an implementation example of the temperature simulation unit of the present invention;

[0016] Figure 5 This is a structural diagram of an implementation example of the temperature measurement unit of the present invention;

[0017] Among them, 100-control terminal, 200-temperature measurement unit, 210-temperature simulation unit, 211-I / V conversion unit, 212-first digital / analog converter DAC, 220-temperature measurement unit, 221-second digital / analog converter DAC, 222-current control unit, 223-voltage follower unit, 224-analog / digital converter ADC, 300-temperature measurement loop, 400-temperature sensor. DETAILED DESCRIPTION

[0018] The temperature simulation measurement device and the simulation measurement method of the present invention are described in detail below with reference to the accompanying drawings and embodiments.

[0019] The temperature simulation measuring device described in the present invention is as follows: Figure 1 As shown, it includes a control terminal 100, a temperature simulation unit 210, a temperature measurement unit 220, a temperature measurement loop 300 and a temperature sensor 400; the temperature simulation unit 210 and the temperature measurement unit 220 are both electrically connected to the control terminal 100; the temperature simulation unit 210 is electrically connected to the temperature measurement loop 300; the temperature measurement unit 220 is electrically connected to the temperature sensor 400. Figure 2 As shown, the temperature simulation unit 210 includes a first digital / analog converter DAC212 and an I / V conversion unit 211; the control terminal 100 is electrically connected to the temperature measurement circuit 300 via the first digital / analog converter DAC212; the temperature measurement circuit 300 is electrically connected to the first digital / analog converter DAC212 via the I / V conversion unit 211. Figure 3 As shown, the temperature measurement unit 220 includes a second digital / analog converter DAC221, a current control unit 222, an analog / digital converter ADC224 and a voltage follower unit 223; the aforementioned control terminal 100, the second digital / analog converter DAC221, the current control unit 222 and the temperature sensor 400 are electrically connected in sequence; the temperature sensor 400, the voltage follower unit 223, the analog / digital converter ADC224 and the control terminal 100 are electrically connected in sequence.

[0020] The temperature simulation measuring device described in the present invention has two functions. The first function is to simulate the thermistor temperature sensor to verify the temperature measurement circuit 300, and the second function is to measure the temperature value of the thermistor temperature sensor 400. The device includes:

[0021] Control terminal 100, in this embodiment, the control terminal adopts a PC with built-in processing software, which is used for parameter configuration, instruction issuance, signal transmission, signal reception, data storage, calculation analysis, data display and other functions during temperature simulation and measurement;

[0022] The temperature simulation measuring device 200 comprises a temperature simulation unit 210 and a temperature measuring unit 220;

[0023] The temperature simulation unit 210 is used to simulate the working characteristics of the temperature sensor and output a temperature simulation signal;

[0024] The temperature measurement unit 220 is used to simulate a temperature measurement loop and measure the temperature signal of the temperature sensor.

[0025] like Figure 2As shown, the temperature simulation unit 210 includes an I / V conversion unit 211 and a digital / analog converter DAC212;

[0026] The I / V conversion unit 211 is used to convert the excitation current signal output by the measurement loop into a reference signal of the digital / analog converter DAC212;

[0027] The digital / analog converter DAC212 is used to convert the temperature digital signal input by the control terminal 100 into an analog signal, so that the measurement circuit 300 can measure an equivalent temperature value.

[0028] like Figure 3 As shown, the temperature measurement unit 220 includes a digital / analog converter DAC221, a current control unit 222, a voltage tracking unit 223, and an analog / digital converter ADC224;

[0029] The digital / analog converter DAC221 is used to convert the excitation current digital signal input by the control terminal 100 into a voltage analog signal;

[0030] The current control unit 222 is used to convert the voltage signal output by the digital / analog converter DAC221 into a current signal as an excitation source for the temperature sensor 400 under test;

[0031] The voltage tracking unit 223 is used to measure the voltage value of the temperature sensor 400;

[0032] The analog-to-digital converter ADC224 is used to convert the voltage value of the measured temperature sensor 400 into a digital signal and feed it back to the control terminal 100 .

[0033] Figure 4The circuit diagram of the temperature simulation unit 210 in this embodiment is shown as follows; the specific temperature simulation principle is as follows: the temperature measurement circuit 300 sends out an excitation current Ia, which is converted into a voltage Ua1 through the I / V conversion unit 211, Ua1=Ia*Ra1, and Ua1 is used as the reference voltage Vref of the digital / analog converter DAC212; the analog temperature value Ta0 (or temperature curve) is input through the control terminal 100, and the functional software of the control terminal 100 calculates the corresponding resistance value Ra0 according to the temperature-resistance characteristic curve of the thermal resistor, and calculates the corresponding digital value D0 according to the algorithm, and then sends the value of the digital value D0 to the digital / analog converter DAC212, then the digital / analog converter DAC212 outputs a voltage Ua2=(D0 / Dn)*Vref, wherein Vref=Ua1, and Dn is the maximum range of the digital / analog converter DAC212; thus, the equivalent resistance Ra0=(Ua1-Ua2) / Ia=(1- D0 / Dn)*Ra1 measured by the temperature measurement circuit 300 can be obtained. Therefore, by inputting the analog temperature value Ta0 through the control terminal 100, the temperature simulation function can be realized to calibrate the temperature measurement circuit 300. At the same time, according to the application requirements (such as thermal resistors of different precisions), the values ​​of Ra1 and Dn can be designed to adjust the precision of the analog resistor. Among them, the digital / analog converter DAC212 can use a DAC chip (such as an 8-bit DAC0832 or a 12-bit DAC1210 chip); the I / V conversion unit 211 can use a common operational amplifier (such as OP07, OP27, etc.).

[0034] Figure 5The circuit diagram of the temperature measurement unit 220 in this embodiment is shown; the specific temperature measurement principle is as follows: the parameters are set by the function software of the control terminal 100, and the excitation current value Ib is input, The control terminal 100 calculates the corresponding digital signal D0 according to the algorithm, and then the control terminal 100 outputs the excitation current digital signal D0. The digital signal D0 is converted into the corresponding voltage signal Ub1 through the digital / analog converter DAC221, Ub1=(D0 / Dn)*Vref, and then Ub1 is converted into the current signal Ib through the current control unit 222, Ib=Ub1 / Rb2+(Ub1-Ub2) / Rb1, because Rb1>>Rb2, then Ib≈Ub1 / Rb2=(D0 / Dn)*Vref / Rb1; the excitation current Ib flows through the temperature sensor 400 to generate a voltage Ub3; the Ub3 value is measured by the voltage tracking unit 223 and the analog / digital converter ADC224 and converted into a digital signal input to the control terminal 100, and then the functional software of the control terminal 100 calculates the equivalent resistance Rb0=Ub3 / Ib=(Dn / D0)*( Ub3 / Vref)*Rb1, and calculate the temperature value Tb0 of the measured temperature sensor 400 according to the temperature-resistance characteristic curve of the thermal resistor. Among them, the digital / analog converter DAC221 and the analog / digital converter ADC224 can both use universal conversion chips, the current control unit 222 can be composed of an operational amplifier (such as OP07) and a transistor (such as 2N3904), and the voltage tracking unit 223 can use an operational amplifier (such as OP07).

Claims

1. A simulation measurement method of a temperature simulation measurement device, Features: The temperature simulation measurement device includes a control terminal, a temperature simulation unit, a temperature measurement unit, a temperature measurement circuit and a temperature sensor; the temperature simulation unit and the temperature measurement unit are both electrically connected to the control terminal; the temperature simulation unit is electrically connected to the temperature measurement circuit; the temperature measurement unit is electrically connected to the temperature sensor; The analog measurement method includes simulation method and measurement method; The simulation method comprises the following steps: inputting a simulated temperature value or a temperature curve through a control terminal, controlling the output of a corresponding signal, converting the temperature through a temperature simulation unit, so that the temperature measurement circuit measures an equivalent temperature value or a temperature change curve; The measuring method comprises the following steps: outputting an excitation current digital signal through a control terminal, converting the excitation current analog signal through a temperature measurement unit, generating a voltage through a temperature sensor, and feeding back the voltage value to the control terminal; the control terminal calculates the resistance value of the temperature sensor through the voltage-current relationship, and finally calculates the current temperature value of the temperature sensor through the temperature-resistance curve of the thermal resistor; The temperature simulation unit includes a first digital / analog converter DAC and an I / V conversion unit; the control terminal is connected to the first digital / analog converter DAC; the temperature measurement loop is electrically connected to the first digital / analog converter DAC via the I / V conversion unit to form a loop; The steps of the simulation method are: converting the temperature value signal input through the control terminal into an analog signal of the corresponding temperature value through the first digital / analog converter DAC and transmitting it to the temperature measurement circuit, so that the temperature measurement circuit measures an equivalent temperature value; the signal output by the temperature measurement circuit is converted into a usable signal of the first digital / analog converter DAC through the I / V conversion unit.

2. The simulation measurement method of the temperature simulation measurement device according to claim 1, Features: The temperature measurement unit includes a second digital / analog converter DAC, a current control unit, an analog / digital converter ADC and a voltage follower unit; the aforementioned control terminal, the second digital / analog converter DAC, the current control unit and the temperature sensor are electrically connected in sequence; the temperature sensor, the voltage follower unit, the analog / digital converter ADC and the control terminal are electrically connected in sequence; The steps of the measuring method are as follows: converting the excitation current digital signal input by the control terminal into a voltage analog signal through the second digital / analog converter DAC; converting the voltage analog signal output by the second digital / analog converter DAC into an excitation current signal by the current control unit as an excitation source for measuring the temperature of the sensor; the excitation current signal generates a voltage through the temperature sensor; the voltage follower unit measures the voltage value of the temperature sensor circuit; converting the voltage value of the sensor circuit to be measured into a digital signal through the analog / digital converter ADC, feeding it back to the control terminal, and calculating the current temperature value of the temperature sensor.

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