Temperature sampling circuit and motor equipment thereof

Abstract

The utility model discloses a temperature sampling circuit and motor equipment thereof. The temperature sampling circuit comprises a first voltage dividing assembly, a thermistor, a second voltage dividing assembly, a first controllable switch assembly and a controller, the first end of the second voltage dividing assembly is electrically connected with the first end of the first voltage dividing assembly through the first controllable switch assembly, the second end of the second voltage dividing assembly is connected with the second end of the first voltage dividing assembly and then electrically connected with the first end of the thermistor, and the second end of the thermistor is grounded. The first end of the first voltage dividing assembly is used for inputting temperature sampling voltage. The controller is electrically connected with the control end of the first controllable switch assembly and the first end of the thermistor. The controller is used for sending a first control signal to the first controllable switch assembly under the condition that the first partial voltage value is greater than a first preset voltage value; the first controllable switch assembly responds to a first control signal and is converted into a closed state, so that the first voltage dividing assembly, the second voltage dividing assembly and the thermistor form a voltage dividing circuit to sample the temperature.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a temperature sampling circuit and a motor device thereof. Background Art

[0002] In view of the nonlinear correlation between the resistance value and temperature of the NTC thermistor, at present, the temperature of the motor is mostly collected by using the NTC thermistor in combination with a pull-up resistor.

[0003] In the current conventional motor temperature sampling method, since the voltage change ratio of the NTC thermistor in the high temperature zone and the low temperature zone is different, the motor temperature acquisition is generally achieved by equipping a plurality of pull-up resistors and multiple NTC thermistors. However, this sampling circuit needs to be configured with multiple NTC thermistors, which significantly increases the cost of motor temperature sampling. Utility Model Content

[0004] In view of the above problems, the present application provides a temperature sampling circuit and a motor device thereof, which can solve the problem of high cost of configuring multiple NTC thermistors in the current motor temperature sampling circuit.

[0005] In a first aspect, the present application provides a temperature sampling circuit, comprising a first voltage-dividing component, a thermistor, a second voltage-dividing component, a first controllable switch component and a controller; the first end of the second voltage-dividing component is electrically connected to the first end of the first voltage-dividing component through the first controllable switch component, the second end of the second voltage-dividing component is electrically connected to the first end of the thermistor after being connected to the second end of the first voltage-dividing component, the second end of the thermistor is grounded, and the first end of the first voltage-dividing component is used to input a temperature sampling voltage; the controller is electrically connected to the control end of the first controllable switch component and the first end of the thermistor respectively; the controller is used to receive a first divided voltage value transmitted by the first end of the thermistor, and send a first control signal to the first controllable switch component when the first divided voltage value is greater than a first preset voltage value, wherein the first divided voltage value is a voltage value obtained by dividing the temperature sampling voltage by the first voltage-dividing component and the thermistor; the first controllable switch component is used to respond to the first control signal and switch to a closed state, so that the first voltage-dividing component, the second voltage-dividing component and the thermistor form a voltage-dividing circuit to sample the temperature corresponding to the temperature sampling voltage.

[0006] The temperature sampling circuit designed above, the controller of this scheme designs that when the received first divided voltage value is greater than the first preset voltage value, that is, the temperature value corresponding to the first divided voltage value exceeds the preset first temperature threshold, the controller sends a first control signal to the first controllable switch component, so that the first controllable switch component is closed, and the parallel circuit between the second divided voltage component and the first divided voltage component is turned on, so that the first divided voltage component, the second divided voltage component and the thermistor are connected in parallel to form a divided voltage circuit. The addition of the second divided voltage component enables the new divided voltage circuit formed by the first divided voltage component, the second divided voltage component and the thermistor to provide a larger voltage variation range than the original divided voltage circuit formed by the first divided voltage component and the thermistor, thereby improving the sampling accuracy of the temperature sampling circuit. Therefore, this scheme realizes the switching of the parallel resistance value through the first controllable switch by characterizing the range of the divided voltage value of the temperature, so that this scheme can realize accurate sampling of different temperature sections of the motor by only using one thermistor, thereby reducing the cost of the temperature sampling circuit.

[0007] In some embodiments, the first voltage dividing component includes a first resistor, and the second voltage dividing component includes a second resistor; the first end of the first resistor is used to input a temperature sampling voltage, the second end of the first resistor is electrically connected to the first end of the thermistor, the first end of the second resistor is electrically connected to the first end of the first resistor after being connected in series with the first controllable switch component, and the second end of the second resistor is electrically connected to the first end of the thermistor.

[0008] In the above implementation mode, the present scheme uses a first resistor, a second resistor and a thermistor to form a voltage divider circuit. Thus, the sampling range of the voltage divider circuit is significantly expanded by adding the second resistor, so that temperature sampling can be performed with higher accuracy in a new temperature range.

[0009] In some embodiments, the first controllable switch component includes a first triode and a first PMOS tube, a third resistor, a fourth resistor and a fifth resistor; the first end of the second resistor is connected to the drain of the first PMOS tube, the source of the first PMOS tube is used to input the temperature sampling voltage, the gate of the first PMOS tube is connected to the first end of the third resistor and the collector of the first triode, and the second end of the third resistor is connected to the source of the first PMOS tube; the emitter of the first triode is grounded, the base of the first triode is respectively connected to the first end of the fourth resistor and the first end of the fifth resistor, the second end of the fourth resistor is grounded, and the second end of the fifth resistor is electrically connected to the controller.

[0010] In the above implementation mode, this scheme realizes the function of the first controllable switch component by controlling the first transistor and the first PMOS tube, and then controls the parallel conduction of the second resistor and the first resistor, so as to switch the parallel resistance value by the electronic switch, thereby effectively improving the sampling accuracy of each temperature section and ensuring the accurate acquisition of the motor temperature data.

[0011] In some embodiments, the resistance of the second resistor is smaller than the resistance of the first resistor.

[0012] In the above implementation, by adding a second resistor with a smaller parallel resistance value, the voltage divider circuit after the three resistors are connected in parallel can provide a larger voltage variation range, thereby improving the sampling accuracy.

[0013] In some embodiments, the temperature sampling circuit also includes a third voltage-dividing component and a second controllable switch component, wherein the first end of the third voltage-dividing component is electrically connected to the first end of the first voltage-dividing component through the second controllable switch component, and the second end of the third voltage-dividing component is electrically connected to the first end of the thermistor; the controller is also used to receive a second voltage-dividing value transmitted by the first end of the thermistor, and when the second voltage-dividing value is greater than a second preset voltage value, send a second control signal to the second controllable switch component, wherein the second voltage-dividing value is a voltage value obtained by dividing the temperature sampling voltage by the first voltage-dividing component, the second voltage-dividing component and the thermistor, and the second preset voltage value is greater than the first preset voltage value; the second controllable switch component is used to respond to the second control signal and convert into a closed state so that the first voltage-dividing component, the second voltage-dividing component, the third voltage-dividing component and the thermistor form a voltage-dividing circuit to sample the temperature corresponding to the temperature sampling voltage.

[0014] In the above implementation mode, the present scheme can further add a third voltage-dividing component and a second controllable switch component. When the second voltage-dividing voltage value is greater than the second preset voltage value, that is, the temperature value corresponding to the second voltage-dividing voltage value is greater than the preset second temperature threshold, the present scheme further controls the third voltage-dividing component to participate in the voltage division, thereby further improving the voltage variation range of the voltage-dividing circuit after parallel connection, thereby improving the sampling accuracy under higher temperature conditions, and thus realizing flexible selection of different voltage-dividing resistors.

[0015] In some embodiments, the third voltage-dividing component includes a sixth resistor, a first end of the sixth resistor is electrically connected to the first end of the first voltage-dividing component through a second controllable switch component, and a second end of the sixth resistor is electrically connected to the first end of the thermistor.

[0016] In some embodiments, the first voltage-dividing component includes a first resistor, the second voltage-dividing component includes a second resistor, the resistance value of the sixth resistor is smaller than that of the second resistor, and the resistance value of the second resistor is smaller than that of the first resistor.

[0017] In some embodiments, the temperature sampling circuit further includes a filtering component; the first end of the thermistor is connected to the controller via the filtering component; the filtering component is used to filter the divided voltage signal output by the first end of the thermistor and transmit it to the controller.

[0018] In the above implementation mode, the present solution filters the output divided voltage signal through the filter component and then outputs it to the controller, thereby reducing the noise of the output divided voltage signal and improving the accuracy of the divided voltage signal recognition.

[0019] In some embodiments, the filtering component includes a seventh resistor and a capacitor; the first end of the thermistor is electrically connected to the first end of the seventh resistor, the second end of the seventh resistor is connected to the first end of the capacitor and then electrically connected to the controller, and the second end of the capacitor is grounded.

[0020] In the above implementation mode, this solution filters the output divided voltage signal through a simple RC filter structure and then outputs it to the controller, thereby reducing the noise of the output divided voltage signal, improving the accuracy of the divided voltage signal recognition, and simplifying the circuit.

[0021] In a second aspect, the present application provides a motor device, which includes the temperature sampling circuit described in the first aspect.

[0022] The motor device designed above includes the temperature sampling circuit described above. Therefore, when the received first divided voltage value is greater than the first preset voltage value, that is, the temperature value corresponding to the first divided voltage value exceeds the preset first temperature threshold, the controller of the designed motor device sends a first control signal to the first controllable switch component, so that the first controllable switch component is closed, and the parallel circuit between the second divided voltage component and the first divided voltage component is turned on, so that the first divided voltage component, the second divided voltage component and the thermistor are connected in parallel to form a divided voltage circuit. The addition of the second divided voltage component enables the new divided voltage circuit formed by the first divided voltage component, the second divided voltage component and the thermistor to provide a larger voltage variation range than the original divided voltage circuit formed by the first divided voltage component and the thermistor, thereby improving the sampling accuracy of the temperature sampling circuit. Therefore, this scheme realizes the switching of the parallel resistance through the first controllable switch by characterizing the range of the divided voltage value of the temperature, so that this scheme can realize accurate sampling of different temperature sections of the motor by only using one thermistor, thereby reducing the cost of the temperature sampling circuit.

[0023] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0025] Figure 1 A first circuit structure schematic diagram of a temperature sampling circuit provided in an embodiment of the present application;

[0026] Figure 2 A second circuit structure schematic diagram of the temperature sampling circuit provided in an embodiment of the present application;

[0027] Figure 3 A third circuit structure schematic diagram of the temperature sampling circuit provided in an embodiment of the present application;

[0028] Figure 4 A fourth circuit structure schematic diagram of the temperature sampling circuit provided in an embodiment of the present application;

[0029] Figure 5 A fifth circuit structure diagram of the temperature sampling circuit provided in an embodiment of the present application;

[0030] Figure 6 A sixth circuit structure diagram of the temperature sampling circuit provided in an embodiment of the present application;

[0031] Figure 7 A seventh circuit structure diagram of the temperature sampling circuit provided in an embodiment of the present application;

[0032] Figure 8 A schematic diagram of the structure of the motor device provided in an embodiment of the present application.

[0033] Icons: 1-temperature sampling circuit; 10-first voltage-dividing component; 20-thermistor; 30-second voltage-dividing component; 40-first controllable switch component; 50-controller; 60-third voltage-dividing component; 70-second controllable switch component; 80-filtering component; R1-first resistor; R2-second resistor; R3-third resistor; R4-fourth resistor; R5-fifth resistor; R6-sixth resistor; R7-seventh resistor; C-capacitor; Q1-first transistor; Q2-first PMOS tube; M-motor. DETAILED DESCRIPTION

[0034] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0036] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0037] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0038] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0039] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0040] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0041] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0042] In view of the nonlinear correlation between the resistance value and temperature of the NTC thermistor, at present, the temperature of the motor is mostly collected by using the NTC thermistor in combination with a pull-up resistor.

[0043] In the current conventional motor temperature sampling method, since the voltage change ratio of the NTC thermistor in the high temperature zone and the low temperature zone is different, the motor temperature acquisition is generally achieved by equipping a plurality of pull-up resistors and multiple NTC thermistors. However, this sampling circuit needs to be configured with multiple NTC thermistors, which significantly increases the cost of motor temperature sampling.

[0044] Based on the above problems, the present application designs a temperature sampling circuit and a motor device thereof. When the received first divided voltage value is greater than the first preset voltage value, that is, the temperature value corresponding to the first divided voltage value exceeds the preset first temperature threshold, the controller sends a first control signal to the first controllable switch component, so that the first controllable switch component is closed, and the parallel circuit between the second divided voltage component and the first divided voltage component is turned on, so that the first divided voltage component, the second divided voltage component and the thermistor are connected in parallel to form a divided voltage circuit. The addition of the second divided voltage component enables the new divided voltage circuit formed by the first divided voltage component, the second divided voltage component and the thermistor to provide a larger voltage variation range than the original divided voltage circuit formed by the first divided voltage component and the thermistor, thereby realizing accurate adaptation of different resistance ranges of NTC thermistors at different temperatures, so that the present scheme only uses one NTC thermistor to achieve accurate sampling of each temperature segment of the motor, thereby reducing the cost of the temperature sampling circuit.

[0045] Based on the above ideas, the present application first provides a temperature sampling circuit, which can sample the temperature of the motor, such as Figure 1 As shown, the temperature sampling circuit includes a first voltage dividing component 10 , a thermistor 20 , a second voltage dividing component 30 , a first controllable switch component 40 and a controller 50 .

[0046] Please refer to Figure 1The circuit connection relationship is as follows: the first end of the second voltage-dividing component 30 of the temperature sampling circuit designed in this scheme is electrically connected to the first end of the first voltage-dividing component 10 through the first controllable switch component 40, the second end of the second voltage-dividing component 30 is electrically connected to the first end of the thermistor 20 after being connected to the second end of the first voltage-dividing component 10, the second end of the thermistor 20 is grounded, and the first end of the first voltage-dividing component 10 is used to input the temperature sampling voltage VCC; the controller 50 is electrically connected to the control end of the first controllable switch component 40 and the first end of the thermistor 20, respectively.

[0047] In the temperature sampling circuit designed above, the first controllable switch component 40 is in a normally open state. When the first controllable switch component 40 is in a disconnected state, in the temperature sampling circuit designed above, the first voltage divider component 10 and the thermistor 20 form a voltage divider circuit, and the temperature sampling voltage VCC received by the first end of the first voltage divider component 10 is divided to obtain a first divided voltage value. The first end of the thermistor 20 outputs the first divided voltage value to the controller 50.

[0048] Among them, the controller 50 is configured with a first preset voltage value, which can be converted based on a first temperature threshold value, and the first temperature threshold value can be determined according to the motor temperature experience value, for example, the first temperature threshold value can be 100°C, etc.; the first preset voltage value can be configured in advance in the memory / register of the controller 50, and in the case of temperature determination, the controller 50 can call the first preset voltage value configured in the memory / register to compare with the identified sampled temperature value. Specifically, the conversion between the first preset voltage value and the first temperature threshold value can be realized through a specific relationship curve between the voltage and temperature corresponding to the thermistor.

[0049] Based on the foregoing description, the controller 50 can receive a first divided voltage value outputted from the first end of the thermistor 20. In this case, the controller 50 can compare the first divided voltage value with the first preset voltage value. If the first divided voltage value is greater than the first preset voltage value, the temperature value corresponding to the temperature sampling voltage is higher. In this case, since the resistance value of the thermistor 20 will change significantly with changes in temperature, the output voltage change of the voltage divider circuit formed by the first divided voltage component 10 and the thermistor 20 is not sufficient to accurately reflect the temperature change, resulting in a large measurement error, which affects the normal operation of the motor.

[0050] Therefore, in the present scheme, when the first divided voltage value is greater than the first preset voltage value, the controller 50 sends the first control signal Temp_Ctr1 to the first controllable switch component 40, and the first controllable switch component 40 responds to the first control signal Temp_Ctr1 and switches from an open state to a closed state, so that the second divided voltage component 30, the first divided voltage component 10 and the thermistor 20 together form a voltage dividing circuit to sample the temperature corresponding to the temperature sampling voltage. In this case, the first end of the thermistor 20 can output a second divided voltage value, and the controller 50 can obtain a more accurate temperature value corresponding to the second divided voltage value based on the specific relationship curve between the voltage and temperature corresponding to the thermistor and the second divided voltage value. In this way, this scheme lowers the voltage-dividing resistance of the first voltage-dividing component 10 by adding the second voltage-dividing component 30, so that the voltage-dividing resistance jointly formed by the first voltage-dividing component 10 and the second voltage-dividing component 30 approaches the resistance value of the thermistor after the temperature value increases significantly. As a result, the new voltage-dividing circuit formed by the first voltage-dividing component 10, the second voltage-dividing component 30 and the thermistor 20 can provide a larger voltage variation range than the original voltage-dividing circuit formed by the first voltage-dividing component 10 and the thermistor 20, thereby improving the sampling accuracy of the temperature sampling circuit.

[0051] The temperature sampling circuit designed above, the controller of this scheme designs that when the received first divided voltage value is greater than the first preset voltage value, that is, the temperature value corresponding to the first divided voltage value exceeds the preset first temperature threshold, the first controllable switch component is sent a first control signal, so that the first controllable switch component is closed, and the parallel circuit between the second divided voltage component and the first divided voltage component is turned on, so that the first divided voltage component, the second divided voltage component and the thermistor are connected in parallel to form a divided voltage circuit, and the divided voltage resistance value of the first divided voltage component 10 is lowered by adding the second divided voltage component 30, so that the first divided voltage component 10 and the second divided voltage component 30 are connected. 0 together form a voltage-dividing resistance value that is close to the resistance value of the thermistor that is significantly reduced due to the increase in temperature. Therefore, the new voltage-dividing circuit formed by the first voltage-dividing component, the second voltage-dividing component and the thermistor can provide a larger voltage variation range than the voltage-dividing circuit originally formed by the first voltage-dividing component and the thermistor, thereby improving the sampling accuracy of the temperature sampling circuit. Therefore, this scheme uses the range of the voltage-dividing voltage value that represents the temperature to achieve the switching of the parallel resistance value through the first controllable switch, so that this scheme only uses one thermistor to achieve accurate sampling of different temperature sections of the motor, thereby reducing the cost of the temperature sampling circuit.

[0052] In an optional implementation manner of this embodiment, as a possible implementation manner, Figure 2 As shown, the first voltage-dividing component 10 designed in this solution may specifically include a first resistor R1, and the second voltage-dividing component 30 includes a second resistor R2.

[0053] In this case, the first end of the first resistor R1 is used to input the temperature sampling voltage VCC, the second end of the first resistor R1 is electrically connected to the first end of the thermistor 20, the first end of the second resistor R2 is electrically connected to the first end of the first resistor R1 in series with the first controllable switch component 40, and the second end of the second resistor R2 is electrically connected to the first end of the thermistor 20.

[0054] In the above implementation, the present solution uses the first resistor R1, the second resistor R2 and the thermistor 20 to form a voltage divider circuit. Thus, the sampling range of the voltage divider circuit is significantly expanded by adding the second resistor R2, so that temperature sampling can be performed with higher accuracy in the new temperature range.

[0055] In an optional implementation manner of the present embodiment, as a possible implementation manner, the resistance value of the second resistor R2 designed in the present scheme may be smaller than the resistance value of the first resistor R1. This is because the resistance value of the thermistor 20 generally decreases sharply with increasing temperature. In such a case, the present scheme adds a second resistor R2 with a smaller parallel resistance value, so that the resistance value of the first resistor R1 and the second resistor R2 in parallel can be close to the resistance value of the thermistor after the resistance value is reduced, so that the voltage divider circuit after the three are connected in parallel can provide a larger voltage variation range, thereby improving the sampling accuracy.

[0056] In an optional implementation manner of this embodiment, as a possible implementation manner, Figure 3 As shown, the first controllable switch component 40 designed in this scheme may specifically include a first transistor Q1 and a first PMOS transistor Q2, a third resistor R3, a fourth resistor R4 and a fifth resistor R5, wherein a first end of the second resistor R2 is connected to the drain of the first PMOS transistor Q2, a source of the first PMOS transistor Q2 is used to input a temperature sampling voltage VCC, a gate of the first PMOS transistor Q2 is connected to a first end of the third resistor R3 and a collector of the first transistor Q1, and a second end of the third resistor R3 is connected to the source of the first PMOS transistor Q2; an emitter of the first transistor Q1 is grounded, a base of the first transistor Q1 is respectively connected to a first end of the fourth resistor R4 and a first end of the fifth resistor R5, a second end of the fourth resistor R4 is grounded, and a second end of the fifth resistor R5 is connected to the controller 50.

[0057] In the above implementation mode, the present scheme controls the parallel conduction of the second resistor R2 and the first resistor R1 through the first transistor Q1 and the first PMOS transistor Q2. Specifically, when the first control signal Temp_Ctr1 output by the controller is not received, the first transistor Q1 is pulled down to ground through the fourth resistor R4 of the base, so that the first transistor Q1 receives a low-level signal. The first transistor Q1 is not turned on at this time. Since the first transistor Q1 is not turned on, the gate of the first PMOS tube inputs the temperature sampling voltage VCC, which is a high level, and the first PMOS tube is also in a non-conducting state. At this time, only the first resistor R1 is connected in parallel with the thermistor 20 to form a voltage divider circuit.

[0058] When the controller outputs the first control signal Temp_Ctr1, the first control signal Temp_Ctr1 is a high-level signal, and the base of the first transistor Q1 receives the high-level signal to turn on the first transistor Q1. After the first transistor Q1 is turned on, the gate of the first PMOS tube is grounded through the first transistor Q1, so that the gate of the first PMOS tube receives a low-level signal, so that the first PMOS tube is also turned on, so that the second resistor R2 and the first resistor R1 are turned on in parallel, and the second resistor R2, the first resistor R1 and the thermistor 20 form a voltage divider circuit.

[0059] In the above implementation mode, this scheme realizes the function of the controllable switch component by controlling the first transistor Q1 and the first PMOS tube Q2, and then controls the parallel conduction of the second resistor R2 and the first resistor R1, so as to switch the parallel resistance value through the electronic switch, thereby effectively improving the sampling accuracy of each temperature section and ensuring the accurate acquisition of the motor temperature data.

[0060] In an optional implementation manner of this embodiment, as another possible implementation manner, Figure 4 As shown, the temperature sampling circuit designed in this scheme may also include a third voltage-dividing component 60 and a second controllable switch component 70, wherein the first end of the third voltage-dividing component 60 is electrically connected to the first end of the first voltage-dividing component 10 through the second controllable switch component 70, and the second end of the third voltage-dividing component 60 is electrically connected to the first end of the thermistor.

[0061] In the above implementation mode, the present scheme can configure a second preset voltage value in the controller 50 in advance, and the second preset voltage value is greater than the first preset voltage value, that is, the temperature threshold corresponding to the second preset voltage value is greater than the temperature value corresponding to the first preset voltage value. When the controller 50 receives the second divided voltage value transmitted by the first end of the thermistor 20, the controller 50 can also compare the second divided voltage value with the second preset voltage value. If it is determined that the second divided voltage value is greater than the second preset voltage value, it means that the current temperature is in a higher range, which is higher than the preset second temperature threshold. In this case, in order to further improve the sampling accuracy of the temperature sampling circuit, the controller 50 sends a second control signal Temp_Ctr2 to the second controllable switch component 70. The second controllable switch component 70, in response to the second control signal Temp_Ctr2, is converted into a closed state, so that the first voltage dividing component 10, the second voltage dividing component 30, the third voltage dividing component 60 and the thermistor 20 form a new voltage dividing circuit to sample the temperature corresponding to the temperature sampling voltage.

[0062] Specifically, based on the above-mentioned new voltage divider circuit, the first end of the thermistor 20 can output a third divided voltage value to the controller 50, and the controller 50 can obtain a more accurate temperature value corresponding to the third divided voltage value based on the specific relationship curve between the voltage and temperature corresponding to the thermistor and the third divided voltage value.

[0063] In the above-mentioned implementation mode, the present scheme further lowers the voltage-dividing resistance of the first voltage-dividing component 10 and the second voltage-dividing component 30 by adding the third voltage-dividing component 60, so that the voltage-dividing resistance jointly formed by the first voltage-dividing component 10, the second voltage-dividing component 30 and the third voltage-dividing component 60 approaches the resistance value of the thermistor after the temperature value increases significantly. Therefore, the new voltage-dividing circuit formed by the first voltage-dividing component 10, the second voltage-dividing component 30, the third voltage-dividing component 60 and the thermistor 20 can provide a further larger voltage variation range compared to the voltage-dividing circuit formed by the first voltage-dividing component 10, the second voltage-dividing component 30 and the thermistor 20, thereby further improving the sampling accuracy of the temperature sampling circuit.

[0064] In an optional implementation of this embodiment, if Figure 5 As shown, the third voltage-dividing component 60 may specifically be a sixth resistor R6, and the structure of the second controllable switch component 70 may be consistent with the structure of the first controllable switch component 40. The specific principles and structures will not be repeated here. For example, the second controllable switch component may include a second transistor Q3, a second PMOS tube Q4 and multiple resistors.

[0065] In an optional implementation manner of the present embodiment, as a possible implementation manner, the resistance value of the sixth resistor R6 designed in the present scheme may be smaller than the resistance value of the second resistor R2, and the resistance value of the second resistor R2 is smaller than the resistance value of the first resistor R1, so that the resistance value of the first resistor R1, the second resistor R2 and the sixth resistor R6 in parallel approaches the resistance value of the thermistor 20 after the resistance value is reduced due to high temperature, so that the voltage divider circuit after the four are connected in parallel can further provide a larger voltage variation range, thereby further improving the sampling accuracy.

[0066] In an optional implementation manner of this embodiment, as a possible implementation manner, the present scheme can also design multiple voltage-dividing components and controllable switch components corresponding to each voltage-dividing component. The controllable switch component corresponding to each voltage-dividing sub-component can receive a control signal. When receiving the control signal output by the controller, the corresponding voltage-dividing component is controlled to be added to the voltage-dividing circuit in parallel to form a new voltage-dividing circuit, thereby realizing flexible selection of different voltage-dividing resistors.

[0067] Among them, the resistance values ​​of the voltage-dividing resistors of different voltage-dividing components in the multiple voltage-dividing components may be different, so that the present solution can flexibly select between voltage-dividing components with different resistance values, thereby improving the adaptability of temperature sampling. In addition, since the resistance value of the thermistor 20 changes to different degrees under different temperature environments, the present solution can also select a voltage-dividing component that adapts to the resistance value change degree of the thermistor 20 for voltage division according to the resistance value change degree of the thermistor 20, thereby further improving the sampling range accuracy of the formed voltage-dividing circuit.

[0068] It should be noted here that the circuit form of the voltage divider component and the corresponding controllable switch component described in this embodiment may be the same as the second voltage divider component 30 and the corresponding first controllable switch component 40, the third voltage divider component 60 and the corresponding second controllable switch component 70 described above. The specific principles have been described above and will not be repeated here.

[0069] In an optional implementation of this embodiment, if Figure 6 As shown, the temperature sampling circuit designed in this scheme also includes a filter component 80. The first end of the thermistor 20 is electrically connected to the filter component 80. The filter component 80 filters the divided voltage signal output by the first end of the thermistor 20 (such as the analog signal corresponding to the first divided voltage value and the second divided voltage value mentioned above) and then outputs it, thereby reducing the noise of the output divided voltage signal and improving the recognition accuracy of the controller for the divided voltage signal.

[0070] As a possible implementation, Figure 7As shown, the filter component 80 designed in this scheme may include a seventh resistor R7 and a capacitor C. The first end of the thermistor 20 is electrically connected to the first end of the seventh resistor R7, and the second end of the seventh resistor R7 is connected to the first end of the capacitor C and then connected to the controller 50, thereby outputting a filtered divided voltage signal to the controller 50, and the second end of the capacitor C is grounded.

[0071] In the above implementation mode, the present scheme filters the divided voltage signal corresponding to the temperature sampling outputted from the first end of the thermistor 20 through a simple RC filtering structure, thereby reducing the noise of the divided voltage signal finally outputted, and further improving the recognition accuracy of the divided voltage signal.

[0072] The present application also provides a motor device, such as Figure 8 As shown, the motor device includes the temperature sampling circuit 1 described above, and the temperature sampling circuit 1 can sample the temperature of the motor M.

[0073] The motor device designed above includes the temperature sampling circuit described above. Therefore, when the received first divided voltage value is greater than the first preset voltage value, that is, the temperature value corresponding to the first divided voltage value exceeds the preset first temperature threshold, the controller of the designed motor device sends a first control signal to the first controllable switch component, so that the first controllable switch component is closed, and the parallel circuit between the second divided voltage component and the first divided voltage component is turned on, so that the first divided voltage component, the second divided voltage component and the thermistor are connected in parallel to form a divided voltage circuit. The addition of the second divided voltage component enables the new divided voltage circuit formed by the first divided voltage component, the second divided voltage component and the thermistor to provide a larger voltage variation range than the original divided voltage circuit formed by the first divided voltage component and the thermistor, thereby improving the sampling accuracy of the temperature sampling circuit. Therefore, this scheme realizes the switching of the parallel resistance through the first controllable switch by characterizing the range of the divided voltage value of the temperature, so that this scheme can realize accurate sampling of different temperature sections of the motor by only using one thermistor, thereby reducing the cost of the temperature sampling circuit.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A temperature sampling circuit, characterized in that: The circuit includes a first voltage dividing component, a thermistor, a second voltage dividing component, a first controllable switch component and a controller; The first end of the second voltage-dividing component is electrically connected to the first end of the first voltage-dividing component through the first controllable switch component, the second end of the second voltage-dividing component is electrically connected to the first end of the thermistor after being connected to the second end of the first voltage-dividing component, the second end of the thermistor is grounded, and the first end of the first voltage-dividing component is used to input a temperature sampling voltage; The controller is electrically connected to the control end of the first controllable switch assembly and the first end of the thermistor respectively; The controller is configured to receive a first divided voltage value transmitted by a first end of the thermistor, and send a first control signal to the first controllable switch component when the first divided voltage value is greater than a first preset voltage value, wherein the first divided voltage value is a voltage value obtained by dividing the temperature sampling voltage by the first voltage dividing component and the thermistor; The first controllable switch component is used to switch to a closed state in response to the first control signal, so that the first voltage divider component, the second voltage divider component and the thermistor form a voltage divider circuit to sample the temperature corresponding to the temperature sampling voltage.

2. The temperature sampling circuit according to claim 1, characterized in that: The first voltage dividing component includes a first resistor, and the second voltage dividing component includes a second resistor; The first end of the first resistor is used to input a temperature sampling voltage, the second end of the first resistor is electrically connected to the first end of the thermistor, the first end of the second resistor is electrically connected to the first end of the first resistor after being connected in series with the first controllable switch component, and the second end of the second resistor is electrically connected to the first end of the thermistor.

3. The temperature sampling circuit according to claim 2, characterized in that: The first controllable switch component includes a first triode and a first PMOS tube, a third resistor, a fourth resistor and a fifth resistor; The first end of the second resistor is connected to the drain of the first PMOS tube, the source of the first PMOS tube is used to input the temperature sampling voltage, the gate of the first PMOS tube is connected to the first end of the third resistor and the collector of the first transistor, and the second end of the third resistor is connected to the source of the first PMOS tube; The emitter of the first transistor is grounded, the base of the first transistor is respectively connected to the first end of the fourth resistor and the first end of the fifth resistor, the second end of the fourth resistor is grounded, and the second end of the fifth resistor is electrically connected to the controller.

4. The temperature sampling circuit according to claim 2, characterized in that: in, The resistance of the second resistor is smaller than the resistance of the first resistor.

5. The temperature sampling circuit according to claim 1, characterized in that: The temperature sampling circuit further includes a third voltage-dividing component and a second controllable switch component, wherein a first end of the third voltage-dividing component is electrically connected to a first end of the first voltage-dividing component through the second controllable switch component, and a second end of the third voltage-dividing component is electrically connected to a first end of the thermistor; The controller is further used to receive a second divided voltage value transmitted by the first end of the thermistor, and send a second control signal to the second controllable switch component when the second divided voltage value is greater than a second preset voltage value, wherein the second divided voltage value is a voltage value obtained by dividing the temperature sampling voltage by the first voltage dividing component, the second voltage dividing component and the thermistor, and the second preset voltage value is greater than the first preset voltage value; The second controllable switch component is used to respond to the second control signal and switch to a closed state, so that the first voltage divider component, the second voltage divider component, the third voltage divider component and the thermistor form a voltage divider circuit to sample the temperature corresponding to the temperature sampling voltage.

6. The temperature sampling circuit according to claim 5, characterized in that: The third voltage-dividing component includes a sixth resistor, a first end of the sixth resistor is electrically connected to the first end of the first voltage-dividing component through the second controllable switch component, and a second end of the sixth resistor is electrically connected to the first end of the thermistor.

7. The temperature sampling circuit according to claim 6, characterized in that: The first voltage-dividing component includes a first resistor, the second voltage-dividing component includes a second resistor, the resistance value of the sixth resistor is smaller than that of the second resistor, and the resistance value of the second resistor is smaller than that of the first resistor.

8. The temperature sampling circuit according to claim 1, characterized in that: The temperature sampling circuit further includes a filter component; the first end of the thermistor is connected to the controller through the filter component; The filter component is used to filter the divided voltage signal output from the first end of the thermistor and transmit the filtered voltage signal to the controller.

9. The temperature sampling circuit according to claim 8, characterized in that: The filtering component includes a seventh resistor and a capacitor; The first end of the thermistor is electrically connected to the first end of the seventh resistor, the second end of the seventh resistor is electrically connected to the controller after being connected to the first end of the capacitor, and the second end of the capacitor is grounded.

10. A motor device, characterized in that: The motor device comprises the temperature sampling circuit according to any one of claims 1-9.

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