Monitoring device, method, controller, electric machine and vehicle

Abstract

This application relates to a monitoring device, method, controller, motor, and vehicle, and pertains to the field of parameter monitoring technology. The monitoring device includes a mode switching circuit and a temperature sampling circuit. The mode switching circuit determines the operating mode based on a switching signal. The temperature sampling circuit is connected to the mode switching circuit and outputs temperature or voltage sampling results based on the operating mode. The mode switching circuit determines its own operating mode based on the received switching signal. The temperature sampling circuit is connected to the mode switching circuit so that it outputs temperature or voltage sampling results according to the operating mode determined by the mode switching circuit. Thus, by changing the operating mode of the mode switching circuit, the desired voltage or temperature sampling results can be obtained without using separate circuits for voltage and temperature sampling, thereby reducing the hardware cost of the monitoring device.

Description

Technical Field

[0001] This application relates to the field of parameter monitoring technology, and in particular to a monitoring device, method, controller, motor, and vehicle. Background Technology

[0002] With the popularization of new energy electric vehicles and the rapid development of motor drive technology, the safety and reliability of motors face higher requirements. Among these, monitoring the voltage loss of the motor power supply bus and collecting temperature data from key components (such as motor windings and power modules) have become crucial for ensuring stable vehicle operation. Abnormal voltage loss of the bus may lead to motor malfunction or damage to power devices, while insufficient temperature monitoring accuracy makes overheat protection difficult, especially under extreme operating conditions or ambient temperatures. Thermistor resistance varies widely, and traditional temperature sampling circuits are prone to exceeding the effective measurement range, further amplifying safety risks. Therefore, it is necessary to monitor the power supply voltage status and temperature parameters.

[0003] Currently, voltage failure monitoring and temperature acquisition are typically implemented using separate functional circuits. Voltage monitoring circuits generally convert the high-voltage bus signal into a low-voltage signal using a voltage divider network, and then use a comparator or analog-to-digital converter (ADC) to determine if the voltage is abnormal. Temperature acquisition circuits, on the other hand, rely on a voltage divider network composed of a thermistor and a fixed resistor, measuring the voltage drop value to infer the temperature value. However, this separate monitoring approach requires two independent hardware circuits, resulting in higher hardware costs. Summary of the Invention

[0004] This application provides a monitoring device that reduces the hardware cost required for voltage and temperature monitoring, thereby at least partially solving the aforementioned technical problems.

[0005] To achieve the above objectives, according to a first aspect of this application, a monitoring device is provided, comprising:

[0006] The mode switching circuit is used to determine the operating mode based on the switching signal;

[0007] A temperature sampling circuit, connected to the mode switching circuit, is used to output temperature sampling results or voltage sampling results according to the operating mode.

[0008] Optionally, the mode switching circuit is used to connect the voltage to be monitored; when the mode switching circuit is in the first working mode, the voltage to be monitored is connected to the temperature sampling circuit.

[0009] When the mode switching circuit is in the second working mode, the voltage to be monitored is disconnected from the temperature sampling circuit.

[0010] Optionally, the temperature sampling circuit is used to connect to a reference voltage; when the mode switching circuit is in the first working mode, the temperature sampling circuit divides the voltage to be monitored and the reference voltage to obtain the voltage sampling result of the voltage to be monitored;

[0011] When the mode switching circuit is in the second working mode, the temperature sampling circuit divides the reference voltage to obtain the temperature sampling result.

[0012] Optionally, the mode switching circuit includes a switching device, which includes a control electrode that receives the switching signal, a first electrode that is connected to the voltage to be monitored, and a second electrode that is connected to the temperature sampling circuit.

[0013] Optionally, the mode switching circuit further includes a first resistor;

[0014] The first resistor includes a first end connected to the second electrode of the switching device and a second end connected to the temperature sampling circuit.

[0015] Optionally, the temperature sampling circuit includes a second resistor and a thermistor;

[0016] The temperature-sensitive resistor includes a first terminal connected to the reference voltage and a second terminal connected to the second resistor and the mode switching circuit.

[0017] The second resistor includes a first terminal connected to the second terminal of the temperature-sensitive resistor and a second terminal grounded.

[0018] Optionally, this method is applied to motors, where the voltage to be monitored includes the three-phase sampling voltage of the motor and the bus voltage.

[0019] Multiple mode switching circuits are provided, and each mode switching circuit is connected to the three-phase sampling voltage and the bus voltage respectively; each mode switching circuit determines its working mode according to its corresponding switching signal.

[0020] The temperature sampling circuit obtains one of the following based on the operating mode of each of the mode switching circuits: the temperature sampling result, the voltage sampling result of the three-phase sampling voltage, and the voltage sampling result of the bus voltage.

[0021] Optionally, it also includes a phase voltage acquisition circuit, connected to the mode switching circuit, for receiving the zero-crossing detection signal and the original three-phase voltage, and generating the three-phase sampling voltage based on the zero-crossing detection signal and the original three-phase signal.

[0022] Optionally, the phase voltage acquisition circuit includes a third resistor, a fourth resistor, and a fifth resistor;

[0023] The third resistor includes a first terminal connected to the zero-crossing detection signal and a second terminal connected to the original three-phase voltage;

[0024] The fourth resistor includes a first terminal connected to the temperature sampling circuit and a second terminal connected to the second terminal of the third resistor;

[0025] The fifth resistor includes a first end connected to the second end of the third resistor and a second end grounded.

[0026] Optionally, it also includes a controller, which includes a signal output terminal and a sampling terminal;

[0027] The signal output terminal is connected to the mode switching circuit and is used to output the switching signal;

[0028] The sampling terminal is connected to the temperature sampling circuit and is used to receive the temperature sampling result and the voltage sampling result.

[0029] According to a second aspect of this application, a monitoring method is provided, applied to the aforementioned monitoring device, comprising:

[0030] The switching signal is output to the mode switching circuit;

[0031] Based on the switching signal, the temperature sampling result or voltage sampling result is obtained from the temperature sampling circuit.

[0032] Optionally, obtaining the temperature sampling result or voltage sampling result from the temperature sampling circuit according to the switching signal includes:

[0033] When the switching signal is in the first state, the temperature sampling result is obtained from the temperature sampling circuit;

[0034] When the switching signal is in the second state, the voltage sampling result is obtained from the temperature sampling circuit.

[0035] According to a third aspect of this application, a controller is provided that stores a computer program, characterized in that the computer program, when executed by a processor, implements the steps of the above-described method.

[0036] According to a fourth aspect of this application, an electric motor is provided, including the monitoring device described above.

[0037] According to a fifth aspect of this application, a vehicle is provided, including the aforementioned motor.

[0038] In summary, in the monitoring device of this application embodiment, the mode switching circuit determines its own operating mode based on the received switching signal. The temperature sampling circuit is connected to the mode switching circuit so as to output temperature sampling results or voltage sampling results according to the operating mode determined by the mode switching circuit. In this way, by switching the operating mode of the mode switching circuit, the required voltage sampling results or temperature sampling results can be obtained without using separate circuits to sample voltage and temperature separately, thereby reducing the hardware cost of the monitoring device.

[0039] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0042] Figure 1 This is a schematic diagram of the monitoring device provided in an exemplary embodiment of this disclosure;

[0043] Figure 2 This is a circuit connection diagram of the monitoring device provided in an exemplary embodiment of this disclosure;

[0044] Figure 3 This is a schematic diagram of a monitoring device applied to an electric motor provided in an exemplary embodiment of this disclosure;

[0045] Figure 4 This is a circuit connection diagram of a monitoring device for an electric motor provided in an exemplary embodiment of this disclosure;

[0046] Figure 5 This is a connection diagram of the phase voltage acquisition circuit provided in an exemplary embodiment of this disclosure;

[0047] Figure 6 This is a flowchart of a monitoring method provided in an exemplary embodiment of this disclosure.

[0048] Explanation of reference numerals in the attached diagram: 1. Mode switching circuit; 11. Switching device; 2. Temperature sampling circuit; 3. Controller; 4. Phase voltage acquisition circuit. Detailed Implementation

[0049] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0050] According to the first aspect of this application, referring to Figure 1 This disclosure provides a monitoring device, including a mode switching circuit 1 and a temperature sampling circuit 2. The mode switching circuit 1 determines the operating mode based on a switching signal. The temperature sampling circuit 2 is connected to the mode switching circuit 1 and outputs temperature sampling results or voltage sampling results according to the operating mode.

[0051] As an example, the switching signal can be a command from the controller. For instance, in a scenario where the monitoring device is used with a motor, when it is necessary to detect the motor bus voltage Vbus, the controller 3 issues a corresponding switching signal to cause the mode switching circuit 1 to enter the corresponding operating mode, so that the temperature sampling circuit 2 outputs the voltage sampling result. Similarly, when it is necessary to sample the motor temperature or the temperature of the motor's power module, the corresponding switching signal is used to cause the mode switching circuit 1 to enter the corresponding operating mode, so that the temperature sampling circuit 2 outputs the temperature sampling result.

[0052] In the above embodiment, the mode switching circuit 1 determines its own operating mode based on the received switching signal. The temperature sampling circuit 2 is connected to the mode switching circuit 1 so as to output the temperature sampling result or voltage sampling result according to the operating mode determined by the mode switching circuit 1. In this way, by switching the operating mode of the mode switching circuit 1, the required voltage sampling result or temperature sampling result can be obtained without using a separate circuit to sample voltage and temperature separately, thereby reducing the hardware cost of the monitoring device.

[0053] Reference Figure 2 In some embodiments, the mode switching circuit 1 is used to connect the voltage to be monitored. When the mode switching circuit 1 is in a first operating mode, the voltage to be monitored is connected to the temperature sampling circuit 2. When the mode switching circuit 1 is in a second operating mode, the voltage to be monitored is disconnected from the temperature sampling circuit 2.

[0054] The voltage to be monitored can be any voltage that needs to be monitored. For example, in the scenario where the monitoring device is applied to a motor, the voltage to be monitored can be the motor's bus voltage Vbus.

[0055] As an example, the switching signal can be a digital signal that includes two levels: a first state and a second state. One of the first and second states is a low-level state, and the other is a high-level state. For example, when the first state of the switching signal is high, the second state is low. Conversely, when the first state of the switching signal is low, the second state is high.

[0056] As an example, the operating mode of the mode switching circuit 1 can be controlled by switching the level state of the switching signal. For instance, when the switching signal is in the first state, the mode switching circuit 1 can be controlled to operate in the first mode; when the switching signal is in the second state, the mode switching circuit 1 can be controlled to operate in the second mode.

[0057] In the above embodiment, the mode switching circuit 1 is connected to the voltage to be monitored. When the mode switching circuit 1 is in the first operating mode, the voltage to be monitored is connected to the temperature sampling circuit 2, at which time the temperature sampling circuit 2 can sample and analyze the voltage to be monitored. When the mode switching circuit 1 is in the second operating mode, the voltage to be monitored is disconnected from the temperature sampling circuit 2, and sampling of the voltage to be monitored stops. By disconnecting the voltage to be monitored in a timely manner when sampling is not required, energy loss of the voltage to be monitored is avoided, thereby reducing power consumption.

[0058] In some embodiments, the temperature sampling circuit 2 is used to connect a reference voltage. When the mode switching circuit 1 is in the first operating mode, the temperature sampling circuit 2 divides the voltage to be monitored and the reference voltage to obtain the voltage sampling result of the voltage to be monitored. When the mode switching circuit 1 is in the second operating mode, the temperature sampling circuit 2 divides the reference voltage to obtain the temperature sampling result.

[0059] The reference voltage can be a stable reference voltage, and its amplitude can be set according to the actual application scenario.

[0060] As an example, when the mode switching circuit 1 is in the first operating mode, the voltage to be monitored is connected to the temperature sampling circuit 2. The temperature sampling circuit 2 simultaneously divides the voltage to be monitored and the reference voltage to obtain the voltage sampling result of the voltage to be monitored. However, when the mode switching circuit 1 is in the second operating mode, the voltage to be monitored is not connected to the temperature sampling circuit 2. In this case, the temperature sampling voltage is only divided by the reference voltage to obtain the temperature sampling result.

[0061] In the above embodiments, the working state of the mode switching circuit 1 controls whether the voltage to be monitored is connected to the temperature sampling circuit 2, so that the temperature sampling circuit 2 can output both voltage sampling results and temperature sampling results, realizing the reuse of the temperature sampling circuit 2, thereby helping to reduce hardware costs.

[0062] Reference Figure 2 In some embodiments, the mode switching circuit 1 includes a switching device 11, which includes a control electrode that receives a switching signal, a first electrode that is connected to the voltage to be monitored, and a second electrode that is connected to the temperature sampling circuit 2.

[0063] The switching device 11 can be any of the following: a metal-oxide-semiconductor field-effect transistor (MOS), a junction field-effect transistor (JFET), a bipolar junction transistor (BJT), or a silicon-controlled rectifier (SCR). Depending on the type of conductive channel, the switching device 11 can be either a P-type or an N-type transistor.

[0064] The amplitude of the switching signal can be set according to the conduction threshold of different types of switching devices 11. The switching signal includes the level states of a first state and a second state, which can be set by the conductive channel type of the switching device 11; for example, when the switching device 11 is a P-type transistor, the first state of the switching signal can be a low-level state to control the conduction of the switching device 11. When the switching device 11 is an N-type transistor, the first state of the switching signal can be a high-level state to control the conduction of the switching device 11.

[0065] In the above embodiments, the switching signal connected to the control electrode of the switching device 11 can control the on / off state of the switching device 11, thereby controlling the on / off state between the voltage and temperature sampling circuit 2 to be monitored, so that the temperature sampling circuit 2 can output both voltage sampling results and temperature sampling results.

[0066] Reference Figure 2 In some embodiments, the mode switching circuit 1 further includes a first resistor R1. The first resistor R1 includes a first end connected to the second electrode of the switching device 11 and a second end connected to the temperature sampling circuit 2.

[0067] In the above embodiment, the first resistor R1 is connected in series with the switching device 11, so that the first resistor R1 can divide and limit the voltage to be monitored connected to the switching device 11. When the switching device 11 is turned on, and the voltage to be monitored is transmitted to the temperature sampling circuit 2 through the switching device 11 and the first resistor R1, the first resistor R1 will divide the voltage to be monitored according to its resistance value, so that the voltage entering the temperature sampling circuit 2 is within a suitable range, avoiding damage to the sampling circuit caused by excessively high voltage.

[0068] In some embodiments, the temperature sampling circuit 2 includes a second resistor R2 and a thermistor RC. The thermistor RC includes a first terminal connected to the reference voltage and a second terminal connected to the second resistor R2 and the mode switching circuit 1. The second resistor R2 includes a first terminal connected to the second terminal of the thermistor RC and a second terminal grounded.

[0069] The thermistor RC can be either a positive temperature coefficient (PTC) thermistor RC or a negative temperature coefficient (NTC) thermistor RC. The resistance of a PTC thermistor RC increases with increasing temperature, while the resistance of a NTC thermistor RC decreases with increasing temperature.

[0070] As an example, a thermistor RC can be placed near the device whose temperature is being measured. For instance, in a scenario where the monitoring device is used in a motor, the thermistor RC can be placed near the power module within the motor. The motor's power module contains several transistors, and the on / off state of each transistor controls the motor's operating state. The power module can convert the input bus voltage Vbus into the required output form, such as DC-AC or AC-DC conversion, to meet the motor's different power requirements. The power module can also amplify the bus voltage Vbus, outputting higher current and voltage signals to provide sufficient power to the motor. During the operation of the power module, a significant amount of heat is generated. The temperature sampling results output by the temperature sampling circuit 2 help ensure that the motor's power module operates within a suitable temperature range. Furthermore, it prevents malfunctions or damage caused by overheating of the power module.

[0071] As an example, when switch 11 is open, the thermistor RC and the second resistor R2 divide the reference voltage. The resulting temperature sampling can be expressed as V1 = VCC * R20 / (RC0 + R20); where VCC represents the amplitude of the reference voltage; R20 represents the resistance of the second resistor R2; and RC0 represents the resistance of the thermistor RC at the current sampling temperature. Since the amplitude of the reference voltage and the resistance of the second resistor R2 are known, the resistance of the thermistor RC can be calculated by combining the temperature sampling result, the amplitude of the reference voltage, and the resistance of the second resistor R2. Therefore, the sampling temperature can be obtained based on the resistance-temperature characteristic curve of the thermistor RC.

[0072] As an example, when switching device 11 is turned on, the first resistor R1, the second resistor R2, and the thermistor RC divide the reference voltage and the voltage to be monitored. The voltage sampling result obtained at this time can be expressed as:

[0073] V2 = (Vbus*R20*RC0 + VCC*R10*R20) / (R10*RC0 + R20*R10 + R20*RC0) where R10 represents the resistance of the first resistor R1; R20 represents the resistance of the second resistor R2; RC0 represents the resistance of the thermistor RC; VCC represents the amplitude of the reference voltage; and Vbus represents the amplitude of the voltage to be monitored.

[0074] It should be noted that the resistance values ​​of the first resistor R1 and the second resistor R2 are known values, while the resistance of the thermistor RC changes with temperature. Therefore, the voltage sampling result will fluctuate within a certain range due to temperature influence. In this case, a threshold range can be set to determine the normal range of the voltage sampling result. If the voltage sampling result is within the threshold range, it is considered that the monitored voltage is not experiencing a power outage and is functioning normally. When the voltage sampling result exceeds the threshold range, it indicates that the amplitude of the monitored voltage has changed significantly, causing the voltage sampling result to exceed the allowable variation range of the thermistor RC. In this case, the monitored voltage is abnormal.

[0075] As an example, if the required sampling temperature range is 20℃-80℃, the corresponding resistance range of the thermistor RC is 10kΩ-2kΩ. Given that the resistance of the first resistor R1 is R10 = 5kΩ, the resistance of the second resistor R2 is R20 = 3kΩ, the reference voltage amplitude VCC = 5V, and the voltage amplitude to be monitored is Vbus = 12V. When the temperature is 20℃, RC0 = 10kΩ, then:

[0076] V2min=(12*3*10+5*5*3) / (5*10+3*5+3*10)=4.58V.

[0077] Similarly, when the temperature is 80% and RC0 = 2kΩ, substituting into the formula yields:

[0078] V2max=(12*3*2+5*5*3) / (5*2+3*5+3*2)=4.74V.

[0079] At this point, the threshold range for the voltage sampling result can be set to 4.58V to 4.74V. When the voltage sampling result exceeds the threshold range, it indicates that the voltage to be monitored is abnormal.

[0080] In the above embodiment, when the mode switching circuit 1 is in the first operating mode, the first resistor R1, the second resistor R2, and the thermistor RC form a voltage divider network. When the mode switching circuit 1 is in the second operating mode, the thermistor RC and the second resistor R2 form a voltage divider network. In this way, the thermistor RC and the second resistor R2 are reused.

[0081] Reference Figure 3 In some embodiments, the monitoring device is applied to a motor, and the voltage to be monitored includes the three-phase sampling voltage of the motor and the bus voltage Vbus. Multiple mode switching circuits 1 are provided, each connected to both the three-phase sampling voltage and the bus voltage Vbus. Each mode switching circuit 1 determines its operating mode based on its corresponding switching signal. The temperature sampling circuit 2 obtains one of the following based on the operating mode of each mode switching circuit 1: the temperature sampling result, the voltage sampling result of the three-phase sampling voltage, or the voltage sampling result of the bus voltage Vbus.

[0082] Combination Figure 4 As an example, the three-phase sampling voltage may include U-phase sampling voltage SH1, V-phase sampling voltage SH2, and W-phase sampling voltage SH3. The voltage sampling results of the three-phase sampling voltage include U-phase sampling results, V-phase sampling results, and W-phase sampling results. In this case, the number of mode switching circuits 1 can be four, and the four mode switching voltages are respectively connected to the first switching signal IO1, the second switching signal IO2, the third switching signal IO3, and the fourth switching signal IO4. Thus, the output result of the temperature sampling circuit 2 can be controlled by the level states of the first switching signal IO1, the second switching signal IO2, the third switching signal IO3, and the fourth switching signal IO4. For example, when the first switching signal IO1 is in the first state, the mode switching circuit 1 connected to the U-phase sampling voltage is turned on, and the temperature sampling circuit 2 outputs the U-phase sampling result. When the second switching signal IO2 is in the first state, the mode switching circuit 1 connected to the V-phase sampling voltage is turned on, and the temperature sampling circuit 2 outputs the V-phase sampling result. When the third switching signal IO3 is in the first state, the mode switching circuit 1 connected to the W-phase sampling voltage is turned on, and the temperature sampling circuit 2 outputs the W-phase sampling result. When the fourth switching signal IO4 is in the first state, the mode switching circuit 1 connected to the bus voltage Vbus is turned on, and the temperature sampling circuit 2 outputs the bus voltage Vbus voltage sampling result. When the first switching signal IO1, the second switching signal IO2, the third switching signal IO3, and the fourth switching signal IO4 are all in the second state, the temperature sampling circuit 2 outputs the temperature sampling result.

[0083] In the above embodiments, each mode switching circuit 1 is connected to the three-phase sampling voltage and the bus voltage Vbus. Under different operating conditions, the controller 3 can send different switching signals to each mode switching circuit 1, so that the temperature sampling circuit 2 can obtain one of the following based on the operating mode of each mode switching circuit 1: the temperature sampling result, the voltage sampling result of the three-phase sampling voltage, and the voltage sampling result of the bus voltage Vbus. This allows for the monitoring of multiple voltages in the motor, and the temperature sampling circuit 2 is reused multiple times, further reducing costs.

[0084] Reference Figure 4 In some embodiments, a phase voltage acquisition circuit 4 is also included, which is connected to the mode switching circuit 1, for receiving the zero-crossing detection signal CMP-ZEO and the original three-phase voltage, and generating a three-phase sampling voltage based on the zero-crossing detection signal CMP-ZEO and the original three-phase signal.

[0085] Reference Figure 5 As an example, the phase voltage acquisition circuit 4 includes a third resistor R3, a fourth resistor R4, and a fifth resistor R5. The third resistor R3 includes a first terminal connected to the zero-crossing detection signal CMP-ZEO and a second terminal connected to the original three-phase voltage. The fourth resistor R4 includes a first terminal connected to the temperature sampling circuit 2 and a second terminal connected to the second terminal of the third resistor R3. The fifth resistor R5 includes a first terminal connected to the second terminal of the third resistor R3 and a second terminal grounded.

[0086] The original three-phase voltages can include the original U-phase voltage AU, the original V-phase voltage BU, and the original W-phase voltage CU. The phase voltage acquisition circuit 4 also has multiple sets, each corresponding to a mode switching circuit 1.

[0087] In the above implementation, firstly, the zero-crossing point of the original three-phase voltage can be detected by the zero-crossing detection signal CMP-ZEO. The phase voltage acquisition circuit 4 processes and analyzes the zero-crossing detection signal CMP-ZEO and the original three-phase voltage. The third resistor R3, the fourth resistor R4, and the fifth resistor R5 form a voltage divider network. The zero-crossing detection signal CMP-ZEO and the original three-phase voltage are input through the third resistor R3, and the input original three-phase circuit is divided and adjusted by the fourth resistor R4 and the fifth resistor R5 so that the three-phase sampling voltage output to the temperature sampling circuit 2 is within a suitable range for subsequent sampling.

[0088] In some embodiments, the monitoring device further includes a controller 3, which includes a signal output terminal and a sampling terminal. The signal output terminal is connected to the mode switching circuit 1 and is used to output a switching signal. The sampling terminal is connected to the temperature sampling circuit 2 and is used to receive temperature sampling results and voltage sampling results.

[0089] In the above embodiments, when it is necessary to sample the voltage to be monitored, the controller 3 can output a first state switching signal to put the mode switching circuit 1 into the first working mode; when it is necessary to collect temperature data, it outputs a second state switching signal to put the mode switching circuit 1 into the second working mode. That is, only one signal output terminal is needed to control the working mode of the mode switching voltage. The sampling terminal can receive the temperature sampling result and the voltage sampling result in a time-division manner according to the state of the switching signal output by the signal output terminal. During the period when the controller 3 outputs the first state switching signal, the sampling terminal receives the voltage sampling result; during the period when the controller 3 outputs the second state switching signal, the sampling terminal receives the temperature sampling result. Thus, the voltage sampling result and the temperature sampling result can be obtained through a single sampling terminal.

[0090] Reference Figure 6 According to a second aspect of this application, a monitoring method is provided, applied to the monitoring device described above, comprising steps S101-S102.

[0091] Step S101: Output a switching signal to mode switching circuit 1.

[0092] Step S102: Obtain the temperature sampling result or voltage sampling result from the temperature sampling circuit 2 according to the switching signal.

[0093] As one implementation of step S102, step S102 may include: when the switching signal is in the first state, obtaining the temperature sampling result from the temperature sampling circuit 2; when the switching signal is in the second state, obtaining the voltage sampling result from the temperature sampling circuit 2.

[0094] According to a third aspect of this application, a controller is provided that stores a computer program, characterized in that the computer program, when executed by a processor, implements the steps of the above-described method.

[0095] According to a fourth aspect of this application, an electric motor is provided, including the monitoring device described above.

[0096] According to a fifth aspect of this application, a vehicle is provided, including the aforementioned motor.

[0097] The vehicle may be a gasoline-powered vehicle, a plug-in hybrid electric vehicle, or a new energy vehicle, etc., and this disclosure does not make any specific restrictions.

[0098] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0099] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0100] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0101] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A monitoring device, characterized in that, include: The mode switching circuit is used to determine the operating mode based on the switching signal; A temperature sampling circuit, connected to the mode switching circuit, is used to output temperature sampling results or voltage sampling results according to the operating mode.

2. The monitoring device according to claim 1, characterized in that, The mode switching circuit is used to connect the voltage to be monitored; when the mode switching circuit is in the first working mode, the voltage to be monitored is connected to the temperature sampling circuit. When the mode switching circuit is in the second working mode, the voltage to be monitored is disconnected from the temperature sampling circuit.

3. The monitoring device according to claim 2, characterized in that, The temperature sampling circuit is used to connect to a reference voltage; when the mode switching circuit is in the first working mode, the temperature sampling circuit divides the voltage to be monitored and the reference voltage to obtain the voltage sampling result of the voltage to be monitored. When the mode switching circuit is in the second working mode, the temperature sampling circuit divides the reference voltage to obtain the temperature sampling result.

4. The monitoring device according to claim 1, characterized in that, The mode switching circuit includes a switching device, which includes a control electrode that receives the switching signal, a first electrode that is connected to the voltage to be monitored, and a second electrode that is connected to the temperature sampling circuit.

5. The monitoring device according to claim 4, characterized in that, The mode switching circuit also includes a first resistor; The first resistor includes a first end connected to the second electrode of the switching device and a second end connected to the temperature sampling circuit.

6. The monitoring device according to claim 3, characterized in that, The temperature sampling circuit includes a second resistor and a thermistor; The temperature-sensitive resistor includes a first terminal connected to the reference voltage and a second terminal connected to the second resistor and the mode switching circuit. The second resistor includes a first terminal connected to the second terminal of the temperature-sensitive resistor and a second terminal grounded.

7. The monitoring device according to claim 6, applied to a motor, characterized in that, The voltage to be monitored includes the three-phase sampling voltage of the motor and the bus voltage; Multiple mode switching circuits are provided, and each mode switching circuit is connected to the three-phase sampling voltage and the bus voltage respectively; each mode switching circuit determines its working mode according to its corresponding switching signal. The temperature sampling circuit obtains one of the following based on the operating mode of each of the mode switching circuits: the temperature sampling result, the voltage sampling result of the three-phase sampling voltage, and the voltage sampling result of the bus voltage.

8. The monitoring device according to claim 7, characterized in that, It also includes a phase voltage acquisition circuit, which is connected to the mode switching circuit, for receiving the zero-crossing detection signal and the original three-phase voltage, and generating the three-phase sampling voltage based on the zero-crossing detection signal and the original three-phase signal.

9. The monitoring device according to claim 8, characterized in that, The phase voltage acquisition circuit includes a third resistor, a fourth resistor, and a fifth resistor; The third resistor includes a first terminal connected to the zero-crossing detection signal and a second terminal connected to the original three-phase voltage; The fourth resistor includes a first terminal connected to the temperature sampling circuit and a second terminal connected to the second terminal of the third resistor; The fifth resistor includes a first end connected to the second end of the third resistor and a second end grounded.

10. The monitoring device according to claim 1, characterized in that, It also includes a controller, which includes a signal output terminal and a sampling terminal; The signal output terminal is connected to the mode switching circuit and is used to output the switching signal; The sampling terminal is connected to the temperature sampling circuit and is used to receive the temperature sampling result and the voltage sampling result.

11. A monitoring method, characterized in that, The monitoring device according to any one of claims 1 to 10 comprises: The switching signal is output to the mode switching circuit; Based on the switching signal, the temperature sampling result or voltage sampling result is obtained from the temperature sampling circuit.

12. The monitoring method according to claim 11, characterized in that, The step of obtaining temperature sampling results or voltage sampling results from the temperature sampling circuit according to the switching signal includes: When the switching signal is in the first state, the temperature sampling result is obtained from the temperature sampling circuit; When the switching signal is in the second state, the voltage sampling result is obtained from the temperature sampling circuit.

13. A controller, characterized in that, It stores a computer program thereon, characterized in that, when executed by a processor, the computer program implements the steps of the method according to any one of claims 11 to 12.

14. An electric motor, characterized in that, Includes the monitoring device as described in any one of claims 1 to 10.

15. A vehicle, characterized in that, Including the motor as described in claim 14.

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