Intelligent adaptation circuit of temperature sensor excitation current source and intelligent adaptation method thereof

Abstract

The application discloses an intelligent adaptive circuit of a temperature sensor excitation current source and an intelligent adaptive method thereof, comprising a voltage acquisition circuit and a constant current source circuit; a signal output end of the voltage acquisition circuit is connected with a controller circuit; a control output end of the controller circuit is connected with a selectable current circuit; the selectable current circuit is connected between a positive electrode end of a temperature sensor and the constant current source circuit; the controller circuit determines an adaptive excitation current source of the temperature sensor based on a voltage acquisition signal of the temperature sensor; the controller circuit changes the output current size of the selectable current circuit by controlling the conduction and shutdown of each switch tube; the application can adapt to temperature sensors of various excitation current sources, and can adapt to the temperature sensors without manually adjusting the excitation current source range, thereby reducing the measurement error caused by the inadaptation of the temperature sensor excitation current selection, supporting various application scenarios of the temperature sensors, and bringing significant convenience to users.

Description

Technical Field

[0001] This invention belongs to the field of excitation current of temperature sensors, specifically relating to an intelligent adaptation circuit for the excitation current source of a temperature sensor. This invention also relates to the intelligent adaptation method used in the intelligent adaptation circuit, which is particularly suitable as a sensing and detection technology for application scenarios with multiple temperature sensors. Background Technology

[0002] A temperature sensor (specifically a "resistance temperature detector") is a passive sensor whose resistance changes with temperature, increasing as temperature rises. To measure the resistance of a temperature sensor, an external electronic device is needed to provide an excitation current source, generating a measurable voltage signal. The temperature is then calculated from the voltage value. Excessive or insufficient excitation current will affect measurement accuracy.

[0003] Furthermore, the types of temperature sensors commonly used in industry today include: platinum resistance temperature sensors: PT100, PT500, and PT1000. Different types of temperature sensors and resistance ranges require different excitation current sources. Specifically, the excitation current source for PT100 is 3mA (recommended value), for PT500 it is 1mA (recommended value), and for PT1000 it is 0.5mA (recommended value).

[0004] However, existing technologies for providing excitation current sources for temperature sensors typically employ fixed current sources, supporting only a single temperature sensor. Their operating principle involves adjusting the resistance to change the output of the excitation current source. However, in practical industrial applications, there are numerous types of temperature sensors, and traditional fixed excitation current sources can only provide a single output current, making it difficult to meet the flexible configuration requirements of various temperature sensor devices.

[0005] Therefore, the applicant seeks technical solutions to improve the above-mentioned technical problems. Summary of the Invention

[0006] In view of this, the purpose of this invention is to propose an intelligent adaptation circuit and method for the excitation current source of a temperature sensor, which can adapt to temperature sensors with various excitation current sources and can adapt to the temperature sensor without manually adjusting the range of the excitation current source. This reduces the measurement error caused by mismatch in the selection of the excitation current of the temperature sensor, supports various application scenarios of temperature sensors, and brings significant convenience to users.

[0007] Therefore, the technical solution adopted by the present invention is as follows: A smart adapter circuit for a temperature sensor excitation current source includes a voltage acquisition circuit connected to the positive and negative terminals of the temperature sensor, and a constant current source circuit connected to the positive terminal of the temperature sensor; wherein, The signal output terminal of the voltage acquisition circuit is connected to the controller circuit. The control output terminal of the controller circuit is connected to an optional current circuit. The optional current circuit is connected between the positive terminal of the temperature sensor and the constant current source circuit, and includes multiple switching transistors; The controller circuit determines the appropriate excitation current source for the temperature sensor based on the voltage acquisition signal from the temperature sensor, and outputs a control signal to the selectable current circuit. The controller circuit changes the output current of the selectable current circuit by controlling the on and off states of each switching transistor.

[0008] Preferably, the optional current circuit includes a first switch branch, a second switch branch, and a third switch branch connected between the positive terminal of the temperature sensor and the constant current source circuit; wherein each switch branch is connected in parallel and is provided with a switching transistor and a voltage divider adjustment resistor that are communicatively connected to the controller circuit.

[0009] Preferably, the switching transistor is a MOSFET.

[0010] Preferably, the controller circuit includes a first control output terminal, a second control output terminal, and a third control output terminal; The first switch branch is provided with a first switch transistor and a first voltage divider regulating resistor. The gate of the first switch transistor is connected to the first control output terminal, its source is connected to the constant current source circuit, and its drain is connected to the positive terminal of the temperature sensor. The second switching branch is provided with a second switching transistor and a second voltage divider regulating resistor. The gate of the second switching transistor is connected to the second control output terminal, and its source is connected to the constant current source circuit. Its drain is connected to the positive terminal of the temperature sensor. The third switch branch is equipped with a third switch transistor and a third voltage divider regulating resistor. The gate of the third switch transistor is connected to the third control output terminal, its source is connected to the constant current source circuit, and its drain is connected to the positive terminal of the temperature sensor.

[0011] Preferably, the constant current source circuit includes a first operational amplifier and a second operational amplifier; wherein, one input terminal of the first operational amplifier is connected to the positive terminal of the temperature sensor, and its other input terminal is connected to its output terminal, and the output terminal is connected to a reference voltage terminal; one input terminal of the second operational amplifier is connected to the reference voltage terminal, and its other input terminal is connected to its output terminal through a second voltage divider resistor, and the output terminal is connected to the positive terminal of the temperature sensor through a first voltage divider resistor; the output terminal of the second operational amplifier is connected to the optional current circuit.

[0012] Preferably, a fourth voltage divider resistor and a fifth voltage divider resistor are connected between the reference voltage terminal and the input terminal of the first operational amplifier, and another branch of the fifth voltage divider resistor is connected to the input terminal of the second operational amplifier; the other branch of the second voltage divider resistor is grounded through a third voltage divider resistor.

[0013] Preferably, the first operational amplifier and the second operational amplifier are each provided with an operational amplifier power supply as a power input terminal, and their power output terminals are respectively grounded.

[0014] Preferably, the voltage acquisition circuit includes a first voltage acquisition input terminal connected to the positive terminal of the temperature sensor and a second voltage acquisition input terminal connected to the negative terminal of the temperature sensor, as well as a first signal output terminal and a second signal output terminal respectively connected to the controller circuit.

[0015] Preferably, in an intelligent adaptation method based on the intelligent adaptation circuit described above, when powered on at room temperature, all switches in the selectable current circuit are in the off state, and the voltage acquisition circuit acquires the first voltage sampling value between the positive and negative terminals of the temperature sensor; then, at least partially turn on the switches in the selectable current circuit, and the voltage acquisition circuit acquires the second voltage sampling value between the positive and negative terminals of the temperature sensor; the resistance of the temperature sensor is calculated based on the difference between the two voltage sampling values, and the conduction state of the selectable current circuit is selected based on the resistance of the temperature sensor.

[0016] Preferably, the calculation process for determining the resistance of the temperature sensor based on the difference between two consecutive voltage sampling values ​​is as follows: Based on the first voltage sampling value Vsample1 and the corresponding output current Iout under the current source condition, the resistance value Rrtd1 corresponding to the temperature sensor at room temperature during the first sampling is calculated. Based on the second voltage sampling value Vsample2 and the corresponding output current Iout under the current source condition, the resistance value Rrtd2 corresponding to the temperature sensor at room temperature during the second sampling is calculated. The resistance values ​​obtained from the two sampling calculations are averaged to obtain the resistance value of the temperature sensor, AVERAGE(Rrtd1,Rrtd2).

[0017] This invention proposes an intelligent adaptation circuit for the excitation current source of a temperature sensor, which can be adapted to temperature sensors with various excitation current sources without the need for manual adjustment of the excitation current source range. This reduces measurement errors caused by mismatch in the selection of the excitation current source for the temperature sensor, supports various application scenarios of temperature sensors, and brings significant convenience to users. This invention is particularly suitable as a sensing and detection technology for application scenarios with multiple temperature sensors, such as industrial IoT and wind power. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the intelligent adapter circuit structure of the temperature sensor excitation current source under a specific embodiment of the present invention; Figure 2 yes Figure 1 A schematic diagram of the structure in the state of adapting to the first type of current source; Figure 3 yes Figure 1 A schematic diagram of the structure in the state of adapting to the second type of current source; Figure 4 yes Figure 1 A schematic diagram of the structure in the state of adapting to the third type of current source; Figure 5 yes Figure 1 A schematic diagram of the structure in the state of adapting to the fourth type of current source; Figure 6 This is a control logic diagram of the intelligent adaptation process of the temperature sensor excitation current source under a specific embodiment of the present invention. Detailed Implementation

[0019] This invention discloses an intelligent adapter circuit for a temperature sensor excitation current source, including a voltage acquisition circuit connected to the positive and negative terminals of the temperature sensor, and a constant current source circuit connected to the positive terminal of the temperature sensor. The signal output terminal of the voltage acquisition circuit is connected to a controller circuit. The control output terminal of the controller circuit controls a selectable current circuit. The selectable current circuit is connected between the positive terminal of the temperature sensor and the constant current source circuit, and includes multiple switching transistors. The controller circuit determines the adapter excitation current source for the temperature sensor based on the voltage acquisition signal from the temperature sensor and outputs a control signal to the selectable current circuit. The controller circuit changes the output current of the selectable current circuit by controlling the on and off states of each switching transistor.

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Please see Figure 1 As shown, this embodiment provides an intelligent adaptation circuit for a temperature sensor excitation current source, including a voltage acquisition circuit connected to the positive terminal RTD+ and the negative terminal RTD- of the temperature sensor, and a constant current source circuit connected to the positive terminal of the temperature sensor; wherein, the signal output terminal of the voltage acquisition circuit is connected to a controller circuit; the control output terminal of the controller circuit controls the connection to a selectable current circuit; the selectable current circuit is connected between the positive terminal RTD+ of the temperature sensor and the constant current source circuit, and includes multiple switching transistors; the controller circuit determines the adaptation excitation current source of the temperature sensor based on the voltage acquisition signal of the temperature sensor, and outputs a control signal to the selectable current circuit; the controller circuit changes the output current of the selectable current circuit by controlling the conduction and cutoff of each switching transistor; Preferably, in this embodiment, the optional current circuit includes a first switch branch, a second switch branch, and a third switch branch connected between the positive terminal RTD+ of the temperature sensor and the constant current source circuit; wherein, each switch branch is connected in parallel and is provided with a switching transistor and a voltage divider adjustment resistor that are communicatively connected to the controller circuit; specifically preferably, each switching transistor is a MOSFET. Preferably, in this embodiment, the controller circuit includes a first control output terminal SW1, a second control output terminal SW2, and a third control output terminal SW3; the first switching branch is provided with a first switching transistor Q1 and a first voltage divider adjustment resistor R6, the gate of the first switching transistor Q1 is connected to the first control output terminal SW1, its source is connected to the constant current source circuit, and its drain is connected to the positive terminal RTD+ of the temperature sensor; the second switching branch is provided with a second switching transistor Q2 and a second voltage divider adjustment resistor R7, the gate of the second switching transistor Q2 is connected to the second control output terminal SW2, its source is connected to the constant current source circuit, and its drain is connected to the positive terminal RTD+ of the temperature sensor; the third switching branch is provided with a third switching transistor Q3 and a third voltage divider adjustment resistor R8, the gate of the third switching transistor Q3 is connected to the third control output terminal SW3, its source is connected to the constant current source circuit, and its drain is connected to the positive terminal RTD+ of the temperature sensor; Specifically, in this preferred embodiment, R1=25KΩ, R6=6.24KΩ, R7=5KΩ, and R8=1.25KΩ; the first switch Q1, the second switch Q2, and the third switch Q3 have the same structure; Preferably, in this embodiment, the constant current source circuit includes a first operational amplifier U1 and a second operational amplifier U2; wherein, one input terminal of the first operational amplifier U1 is connected to the positive terminal of the temperature sensor, and its other input terminal is connected to its output terminal, and the output terminal is connected to the reference voltage V_REF terminal; one input terminal of the second operational amplifier U2 is connected to the reference voltage V_REF terminal, and its other input terminal is connected to its output terminal through a second voltage divider resistor R2, and the output terminal is connected to the positive terminal RTD+ of the temperature sensor through a first voltage divider resistor R1 (specifically, a resistance value of 25KΩ is selected in this embodiment); the output terminal of the second operational amplifier U2 is connected to an optional current circuit; More preferably, in this embodiment, a fourth voltage divider resistor R4 and a fifth voltage divider resistor R4 are connected between the reference voltage V_REF terminal (specifically, in this embodiment, 2.5VDC is selected as the reference voltage V_REF) and the input terminal of the first operational amplifier U1, and another branch of the fifth voltage divider resistor R4 is connected to the input terminal of the second operational amplifier U2; the other branch of the second voltage divider resistor R2 is grounded to GND through a third voltage divider resistor R3; the first operational amplifier U1 and the second operational amplifier U2 are respectively provided with an operational amplifier power supply (specifically, 5VDC is selected in this embodiment) as the power input terminal, and their power output terminals are respectively grounded to GND.

[0022] Preferably, in this embodiment, the voltage acquisition circuit includes a first voltage acquisition input terminal Vol1 connected to the positive terminal of the temperature sensor and a second voltage acquisition input terminal Vol2 connected to the negative terminal of the temperature sensor, as well as a first signal DATA1 output terminal and a second signal DATA2 output terminal respectively connected to the controller circuit.

[0023] This embodiment also proposes an intelligent adaptation method based on the intelligent adaptation circuit described above. When powered on at room temperature, all switches in the selectable current circuit are in the off state. The voltage acquisition circuit acquires the first voltage sample value between the positive terminal RTD+ and the negative terminal RTD- of the temperature sensor. Then, the switches in the selectable current circuit are at least partially turned on, and the voltage acquisition circuit acquires the second voltage sample value between the positive and negative terminals of the temperature sensor. The resistance of the temperature sensor is calculated based on the difference between the two voltage sample values, and the conduction state of the selectable current circuit is selected based on the resistance of the temperature sensor. Please refer to the above for further details. Figure 6 As shown, preferably, in this embodiment, the intelligent adaptation method specifically includes the following steps: Step 1: Power on the temperature sensor to be adapted with the excitation current source at room temperature (i.e., Figure 6 (The device is powered on at room temperature). Step 2: The controller circuit sets its first control output terminal SW1, second control output terminal SW2, and third control output terminal SW3 to a low-level 0 signal input state (that is...) Figure 6 The settings shown (SW1="0", SW2="0", SW3="0") ensure that all switches in the selectable current circuit are turned off; please refer to [reference needed]. Figure 2 As shown, this embodiment is in the state of adapting to the first type of current source, which can provide an adapting current source for calculating the resistance value of the temperature sensor at room temperature. At this time, the output current Iout = V_REF / R1 = 2.5V / 25KΩ = 0.1mA; Step 3: The voltage acquisition circuit acquires the sampled values ​​Vol1 and Vol2 from the positive terminal RTD+ and negative terminal RTD- of the temperature sensor, respectively, and then obtains the first voltage sampled value Vsample1 = Vol1 - Vol2 (i.e., ...). Figure 6 The voltage value of the voltage acquisition circuit Vacquisition1 = Vol1 - Vol2 is shown. At the same time, the corresponding output current Iout is 0.1mA. Then, the resistance value Rrtd1 of the temperature sensor at the first sampling room temperature is calculated. Step 4: The controller circuit sets its first control output terminal SW1 to a high-level 1 signal input state, and sets both the second control output terminal SW2 and the third control output terminal SW3 to a low-level 0 signal input state (that is... Figure 6 The settings shown (SW1="1", SW2="0", SW3="0") ensure that the first switch Q1 in the selectable current circuit is turned on, while the second and third switches Q2 and Q3 are turned off. Please refer to [reference needed]. Figure 3 As shown, this embodiment is in the state of adapting to the second current source, which can provide an adapted current source for calculating the resistance value of the temperature sensor at room temperature, and provide an adapted excitation current source for the PT1000 model temperature sensor. At this time, the output current Iout = V_REF / (R1 / / R6) = 0.5mA. Step 5: The voltage acquisition circuit acquires the sampled values ​​Vol1 and Vol2 from the positive terminal RTD+ and negative terminal RTD- of the temperature sensor, respectively, and then obtains the second voltage sampled value Vsample2 = Vol1 - Vol2 (i.e., ...). Figure 6 The voltage value of the voltage acquisition circuit, Vacquired2 = Vol1 - Vol2, is shown. At the same time, the corresponding output current Iout is 0.5mA. Then, the resistance value Rrtd2 of the temperature sensor at the second sampling temperature is calculated. Step 6: Since the resistance value of the temperature sensor at room temperature during the first sampling is Rrtd1=Vsample1 / 0.1mA; and the resistance value of the temperature sensor at room temperature during the second sampling is Rrtd2=Vsample2 / 0.5mA; the resistance values ​​obtained from the two samplings are averaged to obtain the resistance value of the temperature sensor AVERAGE(Rrtd1,Rrtd2). Step 7: Identify the type of temperature sensor currently connected based on the calculated resistance value of the temperature sensor. The controller circuit adapts the excitation current source of the temperature sensor by controlling the on and off of each switching transistor. Please refer to the above for further details. Figure 6 , Figure 3 , Figure 4 and Figure 5 As shown, preferably, in this embodiment, when the resistance AVERAGE (Rrtd1, Rrtd2) of the temperature sensor is within the range of 110Ω ± 10%, it is determined to be a PT100 model temperature sensor, and the controller circuit sets its first control output terminal SW1, second control output terminal SW2, and third control output terminal SW3 to a high-level 1 signal input state (that is...). Figure 6 The settings shown (SW1="1", SW2="1", SW3="1") ensure that the first switch Q1, the second switch Q2, and the third switch Q3 in the selectable current circuit are all in the on state. See [link to documentation] for details. Figure 5 As shown, at this time, the output current Iout = V_REF / (R1 / / R6 / / R7 / / R8); thus completing... Figure 6 The message "PT100 current source adaptation complete" is displayed. When the resistance (Rrtd1, Rrtd2) of the temperature sensor is within the range of 550Ω ± 10%, it is determined to be a PT500 model temperature sensor. The controller circuit sets its first control output terminal SW1 and second control output terminal SW2 to a high-level (1) signal input state, and sets its third control output terminal SW3 to a low-level (0) signal input state (i.e., ...). Figure 6 The settings shown (SW1="1", SW2="1", SW3="0") ensure that the first and second switches Q1 and Q2 in the selectable current circuit are on, while the third switch Q3 is off. See [link to documentation] for details. Figure 4 As shown, at this time, the output current Iout = V_REF / (R1 / / R6 / / R7); thus completing... Figure 6 The message "PT500 current source adaptation complete" is displayed. When the resistance (Rrtd1, Rrtd2) of the temperature sensor is within the range of 1100Ω ± 10%, it is determined to be a PT100 model temperature sensor. The controller circuit sets its first control output terminal SW1 to a high-level 1 signal input state and its second control output terminal SW2 and third control output terminal SW3 to a low-level 0 signal input state. Figure 6 The settings shown (SW1="1", SW2="0", SW3="0") ensure that the first switch Q1 in the selectable current circuit is turned on, while the second and third switches Q2 and Q3 are turned off. See [link to documentation] for details. Figure 3 As shown, at this time, the output current Iout = V_REF / (R1 / / R6); thus completing... Figure 6 The message "PT1000 current source adaptation complete" is displayed.

[0024] This embodiment can intelligently select appropriate excitation current parameters according to the type of temperature sensor used (such as PT100, PT500, PT1000, etc.), supporting various application scenarios of temperature sensors and bringing significant convenience to users.

[0025] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0026] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A smart adaptation method for a smart adaptation circuit of a temperature sensor excitation current source, characterized in that, The intelligent adapter circuit includes a voltage acquisition circuit connected to the positive terminal (RTD+) and negative terminal (RTD-) of the temperature sensor, and a constant current source circuit connected to the positive terminal of the temperature sensor; wherein, The signal output terminal of the voltage acquisition circuit is connected to the controller circuit. The control output terminal of the controller circuit is connected to an optional current circuit. The optional current circuit is connected between the positive terminal (RTD+) of the temperature sensor and the constant current source circuit, and includes multiple switching transistors; The constant current source circuit includes a first operational amplifier (U1) and a second operational amplifier (U2); wherein, one input terminal of the first operational amplifier (U1) is connected to the positive terminal of the temperature sensor, and its other input terminal is connected to its output terminal, which is connected to a reference voltage terminal; one input terminal of the second operational amplifier (U2) is connected to the reference voltage terminal, and its other input terminal is connected to its output terminal through a second voltage divider resistor (R2), which is connected to the positive terminal (RTD+) of the temperature sensor through a first voltage divider resistor (R1); the output terminal of the second operational amplifier (U2) is connected to the selectable current circuit; The optional current circuit includes a first switch branch, a second switch branch, and a third switch branch connected between the positive terminal (RTD+) of the temperature sensor and the constant current source circuit; wherein each switch branch is connected in parallel and is equipped with a switching transistor and a voltage divider adjustment resistor that are communicatively connected to the controller circuit. The controller circuit includes a first control output terminal (SW1), a second control output terminal (SW2), and a third control output terminal (SW3). The first switch branch is provided with a first switch transistor (Q1) and a first voltage divider adjustment resistor (R6). The gate of the first switch transistor (Q1) is connected to the first control output terminal (SW1), and its source is connected to the constant current source circuit. Its drain is connected to the positive terminal (RTD+) of the temperature sensor after being connected to the first voltage divider adjustment resistor (R6). The second switch branch is provided with a second switch (Q2) and a second voltage divider adjustment resistor (R7). The gate of the second switch (Q2) is connected to the second control output terminal (SW2), and its source is connected to the constant current source circuit. Its drain is connected to the positive terminal (RTD+) of the temperature sensor after being connected to the second voltage divider adjustment resistor (R7). The third switch branch is equipped with a third switch transistor (Q3) and a third voltage divider regulating resistor (R8). The gate of the third switch transistor (Q3) is connected to the third control output terminal (SW3), and its source is connected to the constant current source circuit. Its drain is connected to the positive terminal (RTD+) of the temperature sensor after being connected to the third voltage divider regulating resistor (R8). The controller circuit determines the appropriate excitation current source for the temperature sensor based on the voltage acquisition signal from the temperature sensor, and outputs a control signal to the selectable current circuit; the controller circuit changes the output current of the selectable current circuit by controlling the on and off of each switching transistor. When powered on at room temperature, all switches in the selectable current circuit are in the off state. The voltage acquisition circuit acquires the first voltage sample value between the positive terminal (RTD+) and the negative terminal (RTD-) of the temperature sensor. Then, the switches in the selectable current circuit are at least partially turned on, and the voltage acquisition circuit acquires the second voltage sample value between the positive and negative terminals of the temperature sensor. The resistance of the temperature sensor is calculated based on the difference between the two voltage sample values, and the conduction state of the selectable current circuit is selected based on the resistance of the temperature sensor. The calculation process for calculating the resistance of the temperature sensor based on the difference between the two voltage sample values ​​is as follows: Based on the first voltage sampling value Vsample1 and the corresponding output current Iout under the current source condition, the resistance value Rrtd1 corresponding to the temperature sensor at room temperature during the first sampling is calculated. Based on the second voltage sampling value Vsample2 and the corresponding output current Iout under the current source condition, the resistance value Rrtd2 corresponding to the temperature sensor at room temperature during the second sampling is calculated. The resistance values ​​obtained from the two sampling calculations are averaged to obtain the resistance value of the temperature sensor, AVERAGE(Rrtd1,Rrtd2).

2. The intelligent adaptation method for the intelligent adaptation circuit of the temperature sensor excitation current source according to claim 1, characterized in that, The switching transistor is a MOSFET.

3. The intelligent adaptation method for the intelligent adaptation circuit of the temperature sensor excitation current source according to claim 1, characterized in that, The reference voltage terminal is connected to the input terminal of the first operational amplifier (U1) by a fourth voltage divider resistor (R4) and a fifth voltage divider resistor (R4), and the other branch of the fifth voltage divider resistor (R4) is connected to the input terminal of the second operational amplifier (U2); the other branch of the second voltage divider resistor (R2) is grounded through a third voltage divider resistor (R3).

4. The intelligent adaptation method for the intelligent adaptation circuit of the temperature sensor excitation current source according to claim 3, characterized in that, The first operational amplifier (U1) and the second operational amplifier (U2) are respectively provided with an operational amplifier power supply as a power input terminal, and their power output terminals are respectively grounded.

5. The intelligent adaptation method for the intelligent adaptation circuit of the temperature sensor excitation current source according to claim 1, characterized in that, The voltage acquisition circuit includes a first voltage acquisition input terminal (Vol1) connected to the positive terminal of the temperature sensor and a second voltage acquisition input terminal (Vol2) connected to the negative terminal of the temperature sensor, as well as a first signal (DATA1) output terminal and a second signal (DATA2) output terminal respectively connected to the controller circuit.

Images