Motor temperature compensation circuit and electronic device

Abstract

The application provides a motor temperature compensation circuit and electronic equipment, the motor temperature compensation circuit turns on two constant current source modules in turn, and a micro control unit is used to collect circuit temperature values of the two constant current source modules. Due to compensation provided by the two constant current source modules, the influence of systematic errors of internal operational amplifier circuits, constant current source circuits and temperature sensors is eliminated, the precision of motor temperature collection and analysis is improved, and the problem that the existing scheme does not consider the existence of deviations of internal resistors, operational amplifiers and constant current source generating circuits, resulting in low precision of motor temperature detection is solved.

Description

Technical Field

[0001] This application relates to the field of motor temperature detection technology, and more specifically, to a motor temperature compensation circuit and electronic device. Background Technology

[0002] During the operation of an electric vehicle, the motor generates heat. If the temperature is not controlled accurately or in a timely manner, the motor may suffer from demagnetization, lifespan reduction, and other harmful phenomena due to overheating, and may even cause safety issues in the electric drive system.

[0003] Currently, most methods use traditional motor temperature sampling circuits, which connect temperature sensors in series and parallel resistors to form a voltage divider circuit. When the sensor resistance changes, the resistance of the series and parallel circuit changes accordingly, and the motor temperature is calculated from the voltage divider value. Alternatively, to improve the accuracy of the acquisition circuit, a constant current source circuit is added. A constant current flows through the temperature sensor, and when the sensor resistance changes, it outputs a changing voltage value, thus calculating a more accurate motor temperature.

[0004] However, commonly used temperature sensors include NTC, PT100, and PT1000. The aforementioned acquisition circuits are mostly suitable for situations where the corresponding changes in temperature and resistance are small. Even a small acquisition error with a PT100 can cause a significant error in motor temperature acquisition, thus placing higher demands on the accuracy of the temperature acquisition circuit. In particular, deviations can occur in the internal resistors, operational amplifiers, and constant current source circuits, which, combined, can cause substantial deviations in motor temperature resolution.

[0005] The existing solution does not take into account the deviations in the internal resistance of the circuit, the operational amplifier, and the constant current source circuit, resulting in low accuracy of motor temperature detection. Summary of the Invention

[0006] The main objective of this application is to provide a motor temperature compensation circuit and electronic device to at least solve the problem that existing solutions do not consider the internal resistance of the circuit, operational amplifiers, and deviations in the constant current source generation circuit, resulting in low accuracy of motor temperature detection.

[0007] To achieve the above objectives, according to one aspect of this application, a motor temperature compensation circuit is provided, the motor temperature compensation circuit comprising:

[0008] A temperature sensor, the first terminal of which is electrically connected to a voltage source, is located inside the motor and is used to detect the temperature of the motor.

[0009] A differential amplifier module has a first input terminal, a second input terminal, and an output terminal. The first input terminal of the differential amplifier module is electrically connected to the first terminal of the temperature sensor, and the second input terminal of the differential amplifier module is electrically connected to the second terminal of the temperature sensor.

[0010] A voltage drop bearing module has a first end, a second end, and a third end, wherein the third end of the voltage drop bearing module is electrically connected to the second end of the temperature sensor.

[0011] A voltage regulator module, wherein the power supply terminal of the voltage regulator module is electrically connected to the voltage source and the first terminal of the voltage drop bearing module, respectively;

[0012] Two constant current source modules, namely a first constant current source module and a second constant current source module, are provided. The conducting terminal of the first constant current source module is electrically connected to the output terminal of the voltage regulator module, the second terminal of the voltage drop bearing module, and the conducting terminal of the second constant current source module, respectively. The first constant current source module and the second constant current source module are used to compensate for the temperature of the motor detected by the temperature sensor.

[0013] The microcontroller has a first control terminal electrically connected to the control terminal of the first constant current source module, a second control terminal electrically connected to the control terminal of the second constant current source module, and a voltage acquisition terminal electrically connected to the output terminal of the differential amplifier module.

[0014] Optionally, the differential amplifier module includes a first operational amplifier resistor module, a second operational amplifier resistor module, a third operational amplifier resistor module, a fourth operational amplifier resistor module, and a first operational amplifier. The first terminal of the first operational amplifier resistor module is electrically connected to the first terminal of the temperature sensor. The first terminal of the third operational amplifier resistor module is electrically connected to the second terminal of the temperature sensor. The non-inverting input terminal of the first operational amplifier is electrically connected to the second terminals of both the first and second operational amplifier resistor modules. The inverting input terminal of the first operational amplifier is electrically connected to the second terminal of both the third and fourth operational amplifier resistor modules. The output terminal of the first operational amplifier is electrically connected to the second terminal of the fourth operational amplifier resistor module and the voltage acquisition terminal of the microcontroller unit. The first terminal of the second operational amplifier resistor module is grounded.

[0015] Optionally, the first constant current source module includes a first power switching device and a first constant current source resistor module, and the second constant current source module includes a second power switching device and a second constant current source resistor module. The drain of the first power switching device is electrically connected to the second terminal of the first constant current source resistor module, and the drain of the second power switching device is electrically connected to the second terminal of the second constant current source resistor module. The gate of the first power switching device is electrically connected to the first control terminal of the microcontroller unit, and the gate of the second power switching device is electrically connected to the second control terminal of the microcontroller unit. The first terminals of the first and second constant current source resistor modules are respectively electrically connected to the output terminal of the voltage regulator module. The input terminal of the voltage regulator module, the source of the first power switching device, and the source of the second power switching device are respectively grounded.

[0016] Optionally, the microcontroller unit is used to perform the following steps:

[0017] The first acquisition voltage is obtained when only the first power switching device is turned on;

[0018] The second acquisition voltage is obtained when only the second power switching device is turned on;

[0019] according to

[0020] Determine the resistance value of the temperature sensor;

[0021] Wherein, RM represents the temperature sensor, R3 is the third operational amplifier resistor module, R4 is the fourth operational amplifier resistor module, R5 is the first voltage divider resistor module, R6 is the second voltage divider resistor module, R7 is the third voltage divider resistor module, R8 is the first constant current source resistor module, R9 is the second constant current source resistor module, Vo1 is the first acquisition voltage, Vo2 is the second acquisition voltage, VCC is the voltage source, and VU1 is the voltage between the first terminal of the temperature sensor and the first voltage divider resistor module when only the first power switching device is turned on. The first voltage divider resistor module is electrically connected between the voltage source and the first terminal of the temperature sensor. The first terminal of the second voltage divider resistor module is electrically connected to the first terminal of the temperature sensor. The second terminal of the second voltage divider resistor module is electrically connected to the second terminal of the temperature sensor. The third voltage divider resistor module is electrically connected between the second terminal of the second voltage divider resistor module and the third terminal of the voltage drop bearing module.

[0022] Optionally, the motor temperature compensation circuit further includes an isolation voltage regulator module, wherein the non-inverting input terminal of the isolation voltage regulator module is electrically connected to the first terminal of the temperature sensor, and the inverting input terminal of the isolation voltage regulator module is electrically connected to the output terminal of the isolation voltage regulator module and the second input terminal of the differential amplifier module.

[0023] Optionally, the motor temperature compensation circuit further includes a fourth voltage divider resistor module, which is electrically connected between the voltage source and the power supply terminal of the voltage regulator module.

[0024] Optionally, the motor temperature compensation circuit further includes a first filter capacitor module and a second filter capacitor module. The first filter capacitor module is electrically connected between the first end and the second end of the temperature sensor. The first end of the second filter capacitor module is electrically connected to the output end of the voltage regulator module, and the second end of the second filter capacitor module is grounded.

[0025] Optionally, the motor temperature compensation circuit further includes a third filter capacitor module and a filter resistor module. The first terminal of the third filter capacitor module is grounded, the second terminal of the third filter capacitor module is electrically connected to the second terminal of the filter resistor module and the voltage acquisition terminal of the microcontroller unit, and the first terminal of the filter resistor module is electrically connected to the output terminal of the differential amplifier module.

[0026] Optionally, the voltage drop bearing module is a transistor structure.

[0027] According to another aspect of this application, an electronic device is provided, comprising: any of the motor temperature compensation circuits described above.

[0028] By applying the technical solution of this application, two constant current source modules are turned on sequentially, and the circuit temperature values ​​of the two constant current source modules are collected by a microcontroller unit. Due to the compensation provided by the two constant current source modules, the influence of systematic errors in the internal operational amplifier circuit, constant current source circuit, and temperature sensor is eliminated, thereby improving the accuracy of motor temperature acquisition and analysis. This solves the problem that existing solutions do not consider the deviations in the internal resistance, operational amplifier, and constant current source generation circuit, resulting in low accuracy of motor temperature detection. Attached Figure Description

[0029] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0030] Figure 1 A first schematic diagram of a motor temperature compensation circuit provided in an embodiment of this application is shown;

[0031] Figure 2 A second schematic diagram of a motor temperature compensation circuit according to an embodiment of this application is shown;

[0032] Figure 3A third schematic diagram of a motor temperature compensation circuit according to an embodiment of this application is shown.

[0033] The above figures include the following reference numerals:

[0034] 100. Differential amplifier module; 200. First constant current source module; 300. Second constant current source module; 400. Microcontroller unit. Detailed Implementation

[0035] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0037] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0038] As described in the background section, most current methods employ traditional motor temperature sampling circuits, where a temperature sensor is connected in series and parallel with resistors to form a voltage divider circuit. When the sensor resistance changes, the resistance of the series and parallel circuit changes accordingly, and the motor temperature is calculated from the voltage divider value. Furthermore, to improve the accuracy of the acquisition circuit, a constant current source circuit is added. A constant current flows through the temperature sensor, and when the sensor resistance changes, it outputs a changing voltage value, thus calculating a more accurate motor temperature. To address the problem of low accuracy in motor temperature detection caused by existing solutions not considering internal circuit resistance, operational amplifiers, and deviations in the constant current source circuit, embodiments of this application provide a motor temperature compensation circuit and electronic device.

[0039] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0040] This application provides a motor temperature compensation circuit, such as Figure 1 As shown, the motor temperature compensation circuit includes:

[0041] A temperature sensor RM is provided, with its first terminal electrically connected to a voltage source VCC. The temperature sensor RM is located inside the motor and is used to detect the temperature of the motor.

[0042] The temperature sensor is a resistive temperature sensor. Depending on the installation location of the temperature sensor, it can detect the voltage at different locations on the motor, such as the bearing temperature and the winding temperature of the motor.

[0043] The differential amplifier module 100 has a first input terminal, a second input terminal, and an output terminal. The first input terminal of the differential amplifier module 100 is electrically connected to the first terminal of the temperature sensor RM, and the second input terminal of the differential amplifier module 100 is electrically connected to the second terminal of the temperature sensor RM.

[0044] The voltage drop bearing module Q3 has a first terminal, a second terminal and a third terminal, and the third terminal of the voltage drop bearing module Q3 is electrically connected to the second terminal of the temperature sensor RM.

[0045] The power supply terminal of the voltage regulator module U1 is electrically connected to the voltage source VCC and the first terminal of the voltage drop bearing module Q3, respectively.

[0046] The voltage regulator module can be a Zener diode.

[0047] Two constant current source modules, namely a first constant current source module 200 and a second constant current source module 300, are provided. The conducting terminal of the first constant current source module 200 is electrically connected to the output terminal of the voltage regulator module U1, the second terminal of the voltage drop bearing module Q3, and the conducting terminal of the second constant current source module 300. The first constant current source module 200 and the second constant current source module 300 are used to compensate for the temperature of the motor detected by the temperature sensor RM.

[0048] The microcontroller unit 400 has a first control terminal electrically connected to the control terminal of the first constant current source module 200, a second control terminal electrically connected to the control terminal of the second constant current source module 300, and a voltage acquisition terminal electrically connected to the output terminal of the differential amplifier module 100.

[0049] In the aforementioned motor temperature compensation circuit, by sequentially turning on two constant current source modules, a microcontroller unit is used to collect the circuit temperature values ​​of the two constant current source modules. Due to the compensation provided by the two constant current source modules, the influence of systematic errors in the internal operational amplifier circuit, constant current source circuit, and temperature sensor is eliminated, thereby improving the accuracy of motor temperature acquisition and analysis. This solves the problem that existing solutions do not consider deviations in the internal resistance, operational amplifier, and constant current source generation circuit, resulting in low accuracy of motor temperature detection.

[0050] In one embodiment of this application, such as Figure 2 As shown, the differential amplifier module 100 includes a first operational amplifier resistor module R1, a second operational amplifier resistor module R2, a third operational amplifier resistor module R3, a fourth operational amplifier resistor module R4, and a first operational amplifier U2. The first terminal of the first operational amplifier resistor module R1 is electrically connected to the first terminal of the temperature sensor RM. The first terminal of the third operational amplifier resistor module R3 is electrically connected to the second terminal of the temperature sensor RM. The non-inverting input terminal of the first operational amplifier U2 is electrically connected to the second terminals of the first operational amplifier resistor module R1 and the second terminal of the second operational amplifier resistor module R2. The inverting input terminal of the first operational amplifier U2 is electrically connected to the second terminal of the third operational amplifier resistor module R3 and the first terminal of the fourth operational amplifier resistor module R4. The output terminal of the first operational amplifier U2 is electrically connected to the second terminal of the fourth operational amplifier resistor module R4 and the voltage acquisition terminal of the microcontroller unit 400. The first terminal of the second operational amplifier resistor module R2 is grounded.

[0051] Specifically, by setting the first op-amp resistor module R1, the second op-amp resistor module R2, the third op-amp resistor module R3, the fourth op-amp resistor module R4, and the first op-amp U2, a stable circuit temperature value is provided for the microcontroller unit.

[0052] In one embodiment of this application, such as Figure 2As shown, the first constant current source module 200 includes a first power switch device Q1 and a first constant current source resistor module R8, and the second constant current source module 300 includes a second power switch device Q2 and a second constant current source resistor module R9. The drain of the first power switch device Q1 is electrically connected to the second terminal of the first constant current source resistor module R8, and the drain of the second power switch device Q2 is electrically connected to the second terminal of the second constant current source resistor module R9. The gate of the first power switch device Q1 is electrically connected to the first control terminal of the microcontroller unit 400, and the gate of the second power switch device Q2 is electrically connected to the second control terminal of the microcontroller unit 400. The first terminals of the first constant current source resistor module R8 and the second constant current source resistor module R9 are respectively electrically connected to the output terminal of the voltage regulator module U1. The input terminal of the voltage regulator module U1, the source of the first power switch device Q1, and the source of the second power switch device Q2 are respectively grounded.

[0053] Specifically, the two power switching devices can be NMOS, and the sequential conduction of the two power switching devices provides compensation to eliminate the influence of systematic errors in the internal operational amplifier circuit, constant current source circuit, and temperature sensor, thereby improving the accuracy of motor temperature acquisition and analysis. The two constant current source resistor modules are used for voltage limiting.

[0054] In one embodiment of this application, such as Figure 2 As shown, the motor temperature compensation circuit also includes an isolation voltage regulator module U3. The non-inverting input terminal of the isolation voltage regulator module U3 is electrically connected to the first terminal of the temperature sensor RM, and the inverting input terminal of the isolation voltage regulator module U3 is electrically connected to the output terminal of the isolation voltage regulator module U3 and the second input terminal of the differential amplifier module 100.

[0055] Specifically, the isolation and voltage regulation module U3 can be a second operational amplifier, used for isolation and voltage regulation.

[0056] In one embodiment of this application, such as Figure 2 As shown, the motor temperature compensation circuit also includes a fourth voltage divider resistor module R10, which is electrically connected between the voltage source VCC and the power supply terminal of the voltage regulator module U1.

[0057] Specifically, the fourth voltage divider resistor module is used to divide the voltage source.

[0058] In one embodiment of this application, such as Figure 2As shown, the motor temperature compensation circuit also includes a first filter capacitor module C1 and a second filter capacitor module C3. The first filter capacitor module C1 is electrically connected between the first end of the temperature sensor RM and the second end of the temperature sensor RM. The first end of the second filter capacitor module C3 is electrically connected to the output end of the voltage regulator module U1, and the second end of the second filter capacitor module C3 is grounded.

[0059] Specifically, the voltage across the temperature sensor is filtered using the first filter capacitor module C1 and the second filter capacitor module C3.

[0060] In one embodiment of this application, such as Figure 2 As shown, the motor temperature compensation circuit also includes a third filter capacitor module C2 and a filter resistor module R11. The first end of the third filter capacitor module C2 is grounded, and the second end of the third filter capacitor module C2 is electrically connected to the second end of the filter resistor module R11 and the voltage acquisition terminal of the microcontroller unit 400, respectively. The first end of the filter resistor module R11 is electrically connected to the output terminal of the differential amplifier module 100.

[0061] Specifically, the voltage output from the output terminal of the differential amplifier module is filtered by the RC filter structure composed of the third filter capacitor module C2 and the filter resistor module R11.

[0062] In one embodiment of this application, the voltage drop bearing module is a transistor structure.

[0063] In one embodiment of this application, the microcontroller unit described above is used to perform the following steps:

[0064] The first acquisition voltage is obtained when only the first power switching device mentioned above is turned on;

[0065] The second acquisition voltage is obtained when only the second power switching device mentioned above is turned on;

[0066] according to

[0067] Determine the resistance value of the temperature sensor mentioned above;

[0068] Wherein, RM represents the temperature sensor, R3 is the third operational amplifier resistor module, R4 is the fourth operational amplifier resistor module, R5 is the first voltage divider resistor module, R6 is the second voltage divider resistor module, R7 is the third voltage divider resistor module, R8 is the first constant current source resistor module, R9 is the second constant current source resistor module, Vo1 is the first acquisition voltage, Vo2 is the second acquisition voltage, VCC is the voltage source, and VU1 is the voltage between the first terminal of the temperature sensor and the first voltage divider resistor module when only the first power switching device is turned on. The first voltage divider resistor module is electrically connected between the voltage source and the first terminal of the temperature sensor. The first terminal of the second voltage divider resistor module is electrically connected to the first terminal of the temperature sensor. The second terminal of the second voltage divider resistor module is electrically connected to the second terminal of the temperature sensor. The third voltage divider resistor module is electrically connected between the second terminal of the second voltage divider resistor module and the third terminal of the voltage drop bearing module.

[0069] Specifically, after comprehensively considering the errors in the circuit, the formula for calculating the output Vo is as follows:

[0070]

[0071] like Figure 3 As shown, V1 is the voltage between the first terminal of RM and the first terminal of R6, and V2 is the voltage between the second terminal of RM and the second terminal of R6.

[0072] By outputting the Vo calculation formula, we can know that the error is concentrated in...

[0073] This is caused by the voltage deviation of V1 and the operational amplifier resistor deviations of R1, R2, R3, and R4. To reduce the V1 deviation, the constant current source circuit needs to be working, the resistance value of R5 needs to be as large as possible, and the operational amplifier resistor deviations of R1, R2, R3, and R4 need to be calculated and eliminated in the final calculation.

[0074] R8, R9, R10, U1, Q1, Q2, Q3, C3, and VCC form a constant current source circuit. When the first constant current source module is working, Q1 is on, Q2 is off, and U1 outputs a constant voltage VU1. At this time, the output current IR8 of the constant current source circuit is:

[0075] Similarly, when the second constant current source module is working, Q2 is turned on and Q1 is turned off. At this time, the output current IR9 of the constant current source circuit is:

[0076] Recorded as:

[0077] Then IR8 = NIR9;

[0078] When the microcontroller unit controls Q1 to turn on, that is, the first constant current source module is turned on, the output Vo1 is:

[0079]

[0080] at this time,

[0081] When the microcontroller unit controls Q2 to turn on, i.e., the second constant current source is turned on, the output Vo2 is:

[0082]

[0083] at this time,

[0084] V11 and V21 are the voltages across RM when the first constant current source module is working, and V12 and V22 are the voltages across RM when the second constant current source module is working.

[0085] Since IR8 = NIR9, V11 - V21 = N(V12 - V22).

[0086] We can obtain:

[0087] in,

[0088]

[0089]

[0090] so

[0091] Therefore, it can be calculated that Error value:

[0092] Using the first constant current source as the main calculation circuit, we can conclude that:

[0093]

[0094] Therefore, the resistance RM of the motor's temperature sensor can be calculated as follows:

[0095]

[0096] This application also provides an electronic device, which includes any of the above-described motor temperature compensation circuits. By sequentially turning on two constant current source modules and using a microcontroller unit to acquire the circuit temperature values ​​of the two constant current source modules, the compensation provided by the two constant current source modules eliminates the influence of systematic errors in the internal operational amplifier circuit, constant current source circuit, and temperature sensor, thereby improving the accuracy of motor temperature acquisition and analysis. This solves the problem that existing solutions do not consider deviations in internal circuit resistance, operational amplifiers, and constant current source generation circuits, resulting in low accuracy of motor temperature detection.

[0097] It should be noted that the above electrical connection can be a direct electrical connection or an indirect electrical connection. A direct electrical connection means that two devices are directly connected, while an indirect electrical connection means that there are other devices such as capacitors and resistors connected between the connected A and B.

[0098] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0099] As can be seen from the above description, the embodiments of this application achieve the following technical effects:

[0100] 1) The motor temperature compensation circuit of this application, by sequentially turning on two constant current source modules, uses a microcontroller unit to collect the circuit temperature values ​​of the two constant current source modules. Due to the compensation provided by the two constant current source modules, the influence of systematic errors of the internal operational amplifier circuit, constant current source circuit, and temperature sensor is eliminated, thereby improving the accuracy of motor temperature acquisition and analysis. This solves the problem that the existing solution does not consider the deviations in the internal resistance, operational amplifier, and constant current source generation circuit, resulting in low accuracy of motor temperature detection.

[0101] 2) The electronic device of this application, by sequentially turning on two constant current source modules, uses a microcontroller unit to collect the circuit temperature values ​​of the two constant current source modules. Due to the compensation provided by the two constant current source modules, the influence of systematic errors in the internal operational amplifier circuit, constant current source circuit, and temperature sensor is eliminated, thereby improving the accuracy of motor temperature acquisition and analysis. This solves the problem that existing solutions do not consider the deviations in the internal resistance, operational amplifier, and constant current source generation circuit, resulting in low accuracy of motor temperature detection.

[0102] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A motor temperature compensation circuit, characterized in that, include: A temperature sensor, the first terminal of which is electrically connected to a voltage source, is located inside the motor and is used to detect the temperature of the motor. A differential amplifier module has a first input terminal, a second input terminal, and an output terminal. The first input terminal of the differential amplifier module is electrically connected to the first terminal of the temperature sensor, and the second input terminal of the differential amplifier module is electrically connected to the second terminal of the temperature sensor. A voltage drop bearing module has a first end, a second end, and a third end, wherein the third end of the voltage drop bearing module is electrically connected to the second end of the temperature sensor. A voltage regulator module, wherein the power supply terminal of the voltage regulator module is electrically connected to the voltage source and the first terminal of the voltage drop bearing module, respectively; Two constant current source modules, namely a first constant current source module and a second constant current source module, are provided. The conducting terminal of the first constant current source module is electrically connected to the output terminal of the voltage regulator module, the second terminal of the voltage drop bearing module, and the conducting terminal of the second constant current source module, respectively. The first constant current source module and the second constant current source module are used to compensate for the temperature of the motor detected by the temperature sensor. The microcontroller unit has a first control terminal electrically connected to the control terminal of the first constant current source module, a second control terminal electrically connected to the control terminal of the second constant current source module, and a voltage acquisition terminal electrically connected to the output terminal of the differential amplifier module. The microcontroller unit is used to perform the following steps: The first acquisition voltage is obtained when only the first power switching device is turned on; The second acquisition voltage is obtained when only the second power switching device is turned on; according to , Determine the resistance value of the temperature sensor; Wherein, RM represents the temperature sensor, R3 is the third operational amplifier resistor module, R4 is the fourth operational amplifier resistor module, R5 is the first voltage divider resistor module, R6 is the second voltage divider resistor module, R7 is the third voltage divider resistor module, R8 is the first constant current source resistor module, R9 is the second constant current source resistor module, Vo1 is the first acquisition voltage, Vo2 is the second acquisition voltage, VCC is the voltage source, VU1 is the voltage between the first terminal of the temperature sensor and the first voltage divider resistor module when only the first power switching device is turned on, the first voltage divider resistor module is electrically connected between the voltage source and the first terminal of the temperature sensor, the first terminal of the second voltage divider resistor module is electrically connected to the first terminal of the temperature sensor, the second terminal of the second voltage divider resistor module is electrically connected to the second terminal of the temperature sensor, and the third voltage divider resistor module is electrically connected between the second terminal of the second voltage divider resistor module and the third terminal of the voltage drop bearing module.

2. The motor temperature compensation circuit according to claim 1, characterized in that, The differential amplifier module includes a first operational amplifier resistor module, a second operational amplifier resistor module, a third operational amplifier resistor module, a fourth operational amplifier resistor module, and a first operational amplifier. The first terminal of the first operational amplifier resistor module is electrically connected to the first terminal of the temperature sensor. The first terminal of the third operational amplifier resistor module is electrically connected to the second terminal of the temperature sensor. The non-inverting input terminal of the first operational amplifier is electrically connected to the second terminals of both the first and second operational amplifier resistor modules. The inverting input terminal of the first operational amplifier is electrically connected to the second terminals of both the third and fourth operational amplifier resistor modules. The output terminal of the first operational amplifier is electrically connected to the second terminal of the fourth operational amplifier resistor module and the voltage acquisition terminal of the microcontroller unit. The first terminal of the second operational amplifier resistor module is grounded.

3. The motor temperature compensation circuit according to claim 2, characterized in that, The first constant current source module includes a first power switching device and a first constant current source resistor module. The second constant current source module includes a second power switching device and a second constant current source resistor module. The drain of the first power switching device is electrically connected to the second terminal of the first constant current source resistor module. The drain of the second power switching device is also electrically connected to the second terminal of the second constant current source resistor module. The gate of the first power switching device is electrically connected to the first control terminal of the microcontroller unit. The gate of the second power switching device is electrically connected to the second control terminal of the microcontroller unit. The first terminals of the first and second constant current source resistor modules are respectively electrically connected to the output terminal of the voltage regulator module. The input terminal of the voltage regulator module, the source of the first power switching device, and the source of the second power switching device are respectively grounded.

4. The motor temperature compensation circuit according to claim 1, characterized in that, The motor temperature compensation circuit also includes an isolation voltage regulator module. The non-inverting input terminal of the isolation voltage regulator module is electrically connected to the first terminal of the temperature sensor, and the inverting input terminal of the isolation voltage regulator module is electrically connected to the output terminal of the isolation voltage regulator module and the second input terminal of the differential amplifier module.

5. The motor temperature compensation circuit according to claim 1, characterized in that, The motor temperature compensation circuit also includes a fourth voltage divider resistor module, which is electrically connected between the voltage source and the power supply terminal of the voltage regulator module.

6. The motor temperature compensation circuit according to claim 1, characterized in that, The motor temperature compensation circuit further includes a first filter capacitor module and a second filter capacitor module. The first filter capacitor module is electrically connected between the first end and the second end of the temperature sensor. The first end of the second filter capacitor module is electrically connected to the output end of the voltage regulator module, and the second end of the second filter capacitor module is grounded.

7. The motor temperature compensation circuit according to claim 1, characterized in that, The motor temperature compensation circuit further includes a third filter capacitor module and a filter resistor module. The first terminal of the third filter capacitor module is grounded, the second terminal of the third filter capacitor module is electrically connected to the second terminal of the filter resistor module and the voltage acquisition terminal of the microcontroller unit, and the first terminal of the filter resistor module is electrically connected to the output terminal of the differential amplifier module.

8. The motor temperature compensation circuit according to any one of claims 1 to 7, characterized in that, The voltage drop bearing module is a transistor structure.

9. An electronic device, characterized in that, include: The motor temperature compensation circuit according to any one of claims 1 to 8.

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