NTC (Negative Temperature Coefficient) temperature sensor sampling voltage division circuit and device and vehicle

Abstract

The invention relates to an NTC temperature sensor sampling voltage division circuit and device and a vehicle. The NTC temperature sensor sampling voltage division circuit comprises at least one first gating module and at least one second gating module; sampling enable signals are connected to the enable end of the first gating module and the enable end of the second gating module, level input signals are connected to the input end of the first gating module and the input end of the second gating module, and voltage division signals are output by the output end of the first gating module and the output end of the second gating module; wherein the pull-up resistance values of the first gating module and the second gating module are different, and a level input signal is input by the NTC temperature sensor; and the sampling enable signal controls the conduction of the first gating module or the second gating module so as to carry out voltage division on the NTC temperature sensor for measuring the temperature in different temperature intervals. According to the technical scheme, the sampling precision of the NTC temperature sensor in different temperature intervals is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of vehicle technology, and in particular to an NTC temperature sensor sampling voltage divider circuit, device and vehicle. Background Art

[0002] With the continuous development of the vehicle field, in order to ensure driving safety and driving experience, more and more sensors are used as automotive senses, such as NTC (Negative Temperature Coefficient) temperature sensors.

[0003] The sampling circuit of the commonly used NTC temperature sensor usually adopts the resistance voltage division method for sampling, and obtains the corresponding temperature value by detecting the resistance change of the NTC temperature sensor. Since the resistance change range of the NTC temperature sensor used for temperature collection is very large, this method can accurately collect the temperature within a certain temperature range. However, when the current voltage division circuit divides the voltage of the NTC temperature sensor, the NTC temperature sensor temperature can only guarantee the sampling accuracy in a single temperature range, while the accuracy of the collection in other temperature ranges decreases. Summary of the invention

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides an NTC temperature sensor sampling voltage divider circuit, device and vehicle, which improve the sampling accuracy of the NTC temperature sensor in different temperature ranges.

[0005] In a first aspect, the present disclosure provides an NTC temperature sensor sampling voltage divider circuit, comprising: at least one first gating module and at least one second gating module;

[0006] The enable end of the first gating module and the enable end of the second gating module are both connected to a sampling enable signal, the input end of the first gating module and the input end of the second gating module are connected to a level input signal, and the output end of the first gating module and the output end of the second gating module output a voltage division signal; wherein the pull-up resistance values ​​of the first gating module and the second gating module are different, and the level input signal is input by an NTC temperature sensor;

[0007] The sampling enable signal controls the first gating module or the second gating module to be turned on, so as to divide the voltage of the NTC temperature sensor measuring temperature in different temperature ranges.

[0008] Optionally, the first gating module includes: a first switch unit and a first resistor;

[0009] The first end of the first switch unit is connected to the sampling enable signal, the second end of the first switch unit is connected to the reference voltage, the third end of the first switch unit is electrically connected to the first end of the first resistor, the second end of the first resistor is connected to the level input signal, and the fourth end of the first switch unit is grounded.

[0010] Optionally, the first switch unit includes: a first switch tube and a second switch tube;

[0011] The control end of the first switch tube is connected to a sampling enable signal, the first end of the first switch tube is electrically connected to the control end of the second switch tube, the second end of the first switch tube is grounded, the first end of the second switch tube is electrically connected to the first resistor, and the second end of the second switch tube is connected to a reference voltage.

[0012] Optionally, the second gating module includes: a second switch unit and a second resistor;

[0013] The first end of the second switch unit is connected to the sampling enable signal, the first end of the second switch unit is electrically connected to the first end of the second resistor, the second end of the second switch unit is connected to the reference voltage, and the second end of the second resistor is connected to the level input signal.

[0014] Optionally, the second switch unit includes: a third switch tube;

[0015] The control end of the third switch tube is connected to the sampling enable signal, the first end of the third switch tube is electrically connected to the second resistor, and the second end of the third switch tube is connected to the reference voltage.

[0016] Optionally, the NTC temperature sensor sampling voltage divider circuit further includes:

[0017] An electrostatic protection module, the electrostatic protection module comprising:

[0018] A first capacitor, wherein a first end of the first capacitor is connected to the level input signal, and a second end of the first capacitor is grounded.

[0019] Optionally, the NTC temperature sensor sampling voltage divider circuit further includes:

[0020] A second capacitor, wherein a first end of the second capacitor is electrically connected to an output end of the first gating module and an output end of the second gating module, and a second end of the second capacitor is grounded.

[0021] Optionally, the NTC temperature sensor sampling voltage divider circuit further includes: a third resistor, a first end of the third resistor is electrically connected to the output end of the first gating module and the output end of the second gating module, and a second end of the third resistor is connected to the voltage divider signal.

[0022] In a second aspect, the present disclosure further provides an NTC temperature sensor sampling device, comprising the NTC temperature sensor sampling voltage divider circuit as described in the first aspect, and further comprising:

[0023] NTC temperature sensor and control module;

[0024] The NTC temperature sensor sampling voltage divider circuit is electrically connected to the NTC temperature sensor and the control module respectively;

[0025] The NTC temperature sensor is used to collect the temperature of the surrounding area and input the level input signal to the NTC temperature sensor sampling voltage divider circuit. The control module is used to send the sampling enable signal to the NTC temperature sensor sampling voltage divider circuit, and obtain the temperature value collected by the NTC temperature sensor according to the voltage divider signal output by the NTC temperature sensor sampling voltage divider circuit.

[0026] In a third aspect, the present disclosure further provides a vehicle, comprising the NTC temperature sensor sampling device as described in the second aspect.

[0027] Compared with the prior art, the technical solution provided by the embodiments of the present disclosure has the following advantages:

[0028] The present invention discloses an NTC temperature sensor sampling voltage-dividing circuit, a device and a vehicle. The NTC temperature sensor sampling voltage-dividing circuit comprises: at least one first gating module and at least one second gating module; an enabling end of the first gating module and an enabling end of the second gating module are both connected to a sampling enabling signal, an input end of the first gating module and an input end of the second gating module are both connected to a level input signal, and an output end of the first gating module and an output end of the second gating module output a voltage-dividing signal; wherein the pull-up resistance values ​​of the first gating module and the second gating module are different; the first gating module and the second gating module are respectively turned on based on the sampling enabling signal to divide the voltage of the NTC temperature sensor measuring temperature in different temperature ranges. Therefore, the first gating module and the second gating module with different pull-up resistance values ​​are respectively turned on based on the sampling enable signal, so as to divide the voltage of the NTC temperature sensor measuring temperature in different temperature ranges, thereby avoiding the problem that the voltage dividing circuit with a single resistance value divides the voltage of the NTC temperature sensor, so that the NTC temperature sensor temperature can only ensure the sampling accuracy in a single temperature range, while the accuracy of the collection in other temperature ranges decreases, thereby improving the sampling accuracy of the NTC temperature sensor in different temperature ranges, so that the NTC temperature sensor can collect a wider range of accurate temperatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0031] Figure 1 A schematic diagram of the structure of a NTC temperature sensor sampling voltage divider circuit provided in an embodiment of the present disclosure;

[0032] Figure 2 A schematic diagram of the structure of an NTC temperature sensor sampling device provided in an embodiment of the present disclosure;

[0033] Figure 3 A simulation schematic diagram of the corresponding relationship between the AD value and temperature of an NTC temperature sensor sampling device provided in an embodiment of the present disclosure;

[0034] Figure 4 A simulation schematic diagram of the corresponding relationship between the AD value and temperature of another NTC temperature sensor sampling device provided in an embodiment of the present disclosure.

[0035] Among them, the correspondence between the figure marks and the structure names is: 1. NTC temperature sensor sampling voltage divider circuit; 2. NTC temperature sensor; 3. Control module; 11. First selection module; 12. Second selection module; 31. ADC module; Q1. First switch tube; Q2. Second switch tube; Q3. Third switch tube; R1. First resistor; R2. Second resistor; R3. Third resistor; R4. Fourth resistor; R5. Fifth resistor; C1. First capacitor; C2. Second capacitor. DETAILED DESCRIPTION

[0036] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0037] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0038] In the related art, the sampling circuit of the commonly used NTC temperature sensor usually adopts the resistance voltage division method for sampling, and obtains the corresponding temperature value by detecting the resistance change of the NTC temperature sensor. Since the resistance change range of the NTC temperature sensor used for collecting temperature is very large, this method can accurately collect the temperature within a certain temperature range. However, when the current voltage division circuit divides the voltage of the NTC temperature sensor, the NTC temperature sensor temperature can only guarantee the accuracy of sampling in a single temperature range, and the accuracy of collection in other temperature ranges decreases.

[0039] In order to solve the above problems, an embodiment of the present disclosure provides an NTC temperature sensor sampling voltage divider circuit. Figure 1 The schematic diagram of the structure of a NTC temperature sensor sampling voltage divider circuit provided by the embodiment of the present disclosure is as follows. Figure 1 As shown, the NTC temperature sensor sampling voltage divider circuit 1 includes: at least one first gating module 11 and at least one second gating module 12;

[0040] The enable end of the first gating module 11 and the enable end of the second gating module 12 are both connected to the sampling enable signal MCU_EN, the input end of the first gating module 11 and the input end of the second gating module 12 are both connected to the level input signal NTC_signal_IN, and the output end of the first gating module 11 and the output end of the second gating module 12 output the voltage division signal MCU_ADC; wherein the pull-up resistance values ​​of the first gating module 11 and the second gating module 12 are different;

[0041] The sampling enable signal MCU_EN turns on the first gating module 11 or the second gating module 12 to divide the voltage of the NTC temperature sensor measuring temperature in different temperature ranges.

[0042] Specifically, since the NTC temperature sensor needs to collect temperatures within a wide temperature range when working, and needs to ensure the accuracy of the collected temperature, using a single pull-up resistor to divide the voltage of the NTC temperature sensor can only ensure the accuracy of temperature collection in a single temperature range. For example, in the traditional temperature collection scheme of transmission oil, the normal working temperature of the transmission oil is, for example, 80℃-90℃, and the resistance value of the resistor in the voltage divider circuit is, for example, 1K. The use of a resistor with this resistance value can meet the sampling accuracy of the normal working temperature, for example, ±2℃. However, in low temperature conditions, such as -40℃, the voltage divider circuit uses a resistor with this resistance value to divide the voltage of the NTC temperature sensor, and its accuracy is about ±10℃, which cannot meet the sampling accuracy requirements.

[0043] In addition, for abnormal working conditions such as open circuit or short circuit to power supply, due to the decrease in sampling accuracy of NTC temperature sensor, there is also the problem that fault cannot be diagnosed. For example, in the sampling scheme of NTC temperature sensor of foot air outlet in the car, the center temperature is 35℃, for example, and the resistance value in the voltage divider circuit is generally selected as 4.64k according to experience. After adopting the voltage divider circuit with this resistance value, the temperature accuracy of NTC temperature sensor near 35℃ is about ±1℃~±2℃, but in the high temperature range such as 100℃~105℃, in the low temperature range such as -40℃~-35℃, the sampling accuracy of NTC temperature sensor is poor. At this time, when the problem of short connection to power supply (SCB, Short Connect to Battery) or open circuit (OL, OPEN load) occurs, the collected AD value is, for example, 4000, and at low temperature such as -40℃, the NTC temperature sensor considers the error of MCU or the deviation of resistance, etc., and the error of the actual collected AD value coincides with the range of the AD value collected by the fault, and at this time, there will be a problem of false alarm or failure to collect the fault.

[0044] In order to solve the above problems, Figure 1 As shown, the embodiment of the present disclosure is provided with at least one first gating module 11 and at least one second gating module 12. The first gating module 11 and the second gating module 12 have different corresponding resistance values, and the voltage division accuracy of the NTC temperature sensor in different temperature measurement environments is different, so that the sampling accuracy of the NTC temperature sensor in different temperature ranges can meet the requirements. Therefore, the first gating module 11 and the second gating module 12 are respectively turned on based on the sampling enable signal MCU_EN, so as to divide the voltage of the NTC temperature sensor measuring temperature in different temperature ranges.

[0045] Exemplarily, when the NTC temperature sensor needs to collect temperature in a first temperature range, such as a low temperature range of -40°C to 35°C, when the sampling enable signal MCU_EN is, for example, a high-level signal, the first gating module 11 is turned on and the second gating module 12 is not turned on. The resistance value corresponding to the first gating module 11 is, for example, the resistance value of the voltage divider resistor corresponding to the NTC temperature sensor when collecting temperature in the first temperature range, for example, 1k. The first gating module 11 divides the voltage of the NTC temperature sensor and outputs a voltage divider signal MCU_ADC, thereby ensuring a high sampling accuracy in the low temperature range of -40°C to 35°C, for example, ±2°C.

[0046] When the NTC temperature sensor needs to collect temperature in the second temperature range, such as the temperature range of 35°C to 125°C, the sampling enable signal MCU_EN can be, for example, a low-level signal or a high-impedance signal, which turns on the second selection module 12 and the first selection module 11 is not turned on. The resistance value corresponding to the second selection module 12 is the resistance value of the voltage divider resistor corresponding to the NTC temperature sensor when collecting in the normal working temperature range, for example, it can be 200k. The second selection module 12 divides the voltage of the NTC temperature sensor and outputs the voltage divider signal MCU_ADC, thereby ensuring a high sampling accuracy in the temperature range of 35°C to 125°C, such as ±2°C.

[0047] It should be noted that the temperatures corresponding to the first temperature interval and the second temperature interval, the resistance values ​​corresponding to different temperature intervals, and the enable signals corresponding to different temperature intervals can be set according to the actual temperature measurement requirements of the NTC temperature sensor, and the embodiments of the present disclosure are not limited thereto.

[0048] Exemplarily, the voltage division signal MCU_ADC can be output to the control module, and the control module obtains the resistance value of the NTC temperature sensor based on the voltage division signal MCU_ADC. The control module can be, for example, an MCU (Micro controller Unit). The ADC (Analog to Digital Converter) module in the MCU converts the voltage value into a digital signal, and then calculates the resistance value of the NTC temperature sensor. Based on the corresponding relationship between the resistance value and the temperature value, the temperature value collected by the NTC temperature sensor is obtained. It should be noted that the calculation method for the temperature value collected by the NTC temperature sensor is well known to those skilled in the art, and the embodiments of the present disclosure do not limit this.

[0049] In some embodiments, multiple first gating modules 11 and multiple second gating modules 12 may be set according to the sampling temperature range of the NTC temperature sensor, and all are connected to the sampling enable signal MCU_EN, which is not limited in the embodiments of the present disclosure.

[0050] The disclosed embodiment sets the first gating module 11 and the second gating module 12 with different pull-up resistance values ​​to be turned on respectively based on the sampling enable signal MCU_EN, thereby dividing the voltage of the NTC temperature sensor measuring the temperature in different temperature ranges, avoiding the problem that a voltage dividing circuit with a single resistance value divides the voltage of the NTC temperature sensor, so that the NTC temperature sensor temperature can only ensure the accuracy of sampling in a single temperature range, while the accuracy of sampling in other temperature ranges decreases, thereby improving the sampling accuracy of the NTC temperature sensor in different temperature ranges.

[0051] Alternatively, if Figure 1As shown, the first gating module 11 includes: a first switching unit and a first resistor R1;

[0052] The first end of the first switching unit is connected to the sampling enable signal MCU_EN, the second end of the first switching unit is connected to the reference voltage VCC_ADC_REF, the third end of the first switching unit is electrically connected to the first end of the first resistor R1, the second end of the first resistor R1 is connected to the level input signal NTC_signal_IN, and the fourth end of the first switching unit is grounded.

[0053] Specifically, as Figure 1 shown, the first gating module 11 may include, for example, a first switching unit and a first resistor R1, and the first end of the first switching unit is connected to the sampling enable signal MCU_EN. Exemplarily, the sampling enable signal MCU_EN connected to the first switching unit is, for example, a high-level signal, and the first switching unit is turned on. The first resistor R1 acts as a pull-up voltage-dividing resistor to divide the voltage with the NTC temperature sensor. When the sampling enable signal MCU_EN connected to the first switching unit is, for example, a low-level signal or a high-impedance state signal, the first switching unit is in an off state, and the first resistor R1 does not act as a pull-up voltage-dividing resistor to divide the voltage with the NTC temperature sensor. Thus, by controlling whether the first resistor R1 divides the voltage of the NTC temperature sensor through the sampling enable signal MCU_EN, the first resistor R1 can divide the voltage of the NTC temperature sensor in the temperature range corresponding to its resistance value where accurate temperature measurement can be performed, improving the temperature measurement accuracy.

[0054] Optionally, as Figure 1 shown, the first switching unit includes: a first switching transistor Q1 and a second switching transistor Q2;

[0055] The control end of the first switching transistor Q1 is connected to the sampling enable signal MCU_EN, the first end of the first switching transistor Q1 is electrically connected to the control end of the second switching transistor Q2, the second end of the first switching transistor Q1 is grounded, the first end of the second switching transistor Q2 is electrically connected to the first resistor R1, and the second end of the second switching transistor Q2 is connected to the reference voltage VCC_ADC_REF.

[0056] Specifically, as Figure 1 shown, the first switching unit may include, for example, a first switching transistor Q1 and a second switching transistor Q2, Figure 1It is exemplarily shown in the figure that the first switch tube Q1 can be, for example, an N-type field effect transistor, and the second switch tube Q2 can be, for example, a P-type field effect transistor. Exemplarily, when the control end of the first switch tube Q1 is connected to, for example, a low-level signal or a high-impedance signal, the first switch tube Q1 is in an off state, the second switch tube Q2 is in an off state, and the first resistor R1 does not act as a pull-up voltage-dividing resistor to divide the voltage of the NTC temperature sensor. When the control end of the first switch tube Q1 is connected to, for example, a high-level signal, the first switch tube Q1 is in an on state, the second switch tube Q2 is also in an on state, and the first resistor R1 acts as a pull-up voltage-dividing resistor to divide the voltage of the NTC temperature sensor. In this way, the first switch tube Q1 and the second switch tube Q2 are used to control whether the first resistor R1 divides the voltage with the NTC temperature sensor, thereby improving the control accuracy of the circuit.

[0057] It should be noted that the first switch tube Q1 and the second switch tube Q2 may also be, for example, triodes, and the specific type can meet the use requirements of the circuit, which is not limited in the embodiments of the present disclosure.

[0058] Alternatively, if Figure 1 As shown, the second gating module 12 includes: a second switch unit and a second resistor R2;

[0059] The first end of the second switch unit is connected to the sampling enable signal MCU_EN, the first end of the second switch unit is electrically connected to the first end of the second resistor R2, the second end of the second switch unit is connected to the reference voltage VCC_ADC_REF, and the second end of the second resistor R2 is connected to the level input signal NTC_signal_IN.

[0060] Specifically, the second gating module 12 includes, for example, a second switch unit and a second resistor R2, and the first end of the second switch unit is connected to the sampling enable signal MCU_EN. Exemplarily, the sampling enable signal MCU_EN connected to the second switch unit is, for example, a low-level signal or a high-impedance signal, the second switch unit is turned on, and the second resistor R2 acts as a pull-up voltage-dividing resistor to divide the voltage with the NTC temperature sensor. When the sampling enable signal MCU_EN connected to the second switch unit is, for example, a high-level signal, the second switch unit is in a non-conducting state, and the second resistor R2 does not act as a pull-up voltage-dividing resistor to divide the voltage with the NTC temperature sensor. Thus, by controlling whether the second resistor R2 divides the voltage of the NTC temperature sensor through the sampling enable signal MCU_EN, the second resistor R2 can divide the voltage of the NTC temperature sensor in the temperature range corresponding to its resistance value and capable of accurate temperature measurement, thereby improving the temperature measurement accuracy.

[0061] Alternatively, if Figure 1 As shown, the second switch unit includes: a third switch tube Q3;

[0062] The control terminal of the third switching transistor Q3 is connected to the sampling enable signal MCU_EN. The first terminal of the third switching transistor Q3 is electrically connected to the second resistor R2, and the second terminal of the third switching transistor Q3 is connected to the reference voltage VCC_ADC_REF.

[0063] Specifically, as Figure 1 shown, the second switching unit may include, for example, a third switching transistor Q3. Figure 1 It is exemplarily shown in that the third switching transistor Q3 may be, for example, a P-type field-effect transistor. Exemplarily, when a high-level signal is connected to the control terminal of the third switching transistor Q3, the third switching transistor Q3 is in an off state, and the second resistor R2 does not act as a pull-up voltage-dividing resistor to divide the voltage of the NTC temperature sensor. When a low-level signal or a high-impedance state signal is connected to the control terminal of the third switching transistor Q3, the third switching transistor Q3 is in a conducting state, and the second resistor R2 acts as a pull-up voltage-dividing resistor to divide the voltage of the NTC temperature sensor. Thus, by using the third switching transistor Q3 to control whether the second resistor R2 divides the voltage with the NTC temperature sensor, the control accuracy of the circuit is improved.

[0064] In some embodiments, it may also be set that the second gating module 12 includes the second resistor R2. When the first switching transistor Q1 and the second switching transistor Q2 are conducted, the first resistor R1 and the second resistor R2 are connected in parallel and act as the voltage-dividing resistor of the NTC temperature sensor.

[0065] Optionally, as Figure 1 shown, the NTC temperature sensor sampling voltage-dividing circuit 1 further includes an electrostatic protection module, and the electrostatic protection module includes:

[0066] A first capacitor C1, the first terminal of the first capacitor C1 is connected to the level input signal NTC_signal_IN, and the second terminal of the first capacitor C1 is grounded.

[0067] Specifically, as Figure 1 shown, the NTC temperature sensor sampling voltage-dividing circuit 1 further includes a first capacitor C1. The first capacitor C1 may, for example, play a role in electrostatic protection. By the capacitance characteristic of the first capacitor C1, an impedance to electrostatic discharge is provided, thereby protecting the circuit and the components in the circuit from damage caused by electrostatic discharge. For example, under normal circumstances, the first capacitor C1 does not impede the current, so it has no impact on the normal operation of the circuit. When the first capacitor C1 receives a high-voltage impact within a short period of time, such as electrostatic discharge, the electrostatic characteristic of the first capacitor C1 will cause the capacitor to discharge rapidly, impede the passage of the high voltage, absorb and disperse the high voltage, and protect the use safety of the NTC temperature sensor sampling voltage-dividing circuit 1. It should be noted that the specific type, material, capacitance value, etc. of the first capacitor C1 can be selected according to the actual use requirements of the NTC temperature sensor sampling voltage-dividing circuit 1, and the embodiments of the present disclosure do not limit this.

[0068] Optionally, as Figure 1 shown, the NTC temperature sensor sampling voltage dividing circuit 1 further includes: a second capacitor C2, the second capacitor C2 is electrically connected to the output end of the first gating module 11 and the output end of the second gating module 12, and the second end of the second capacitor C2 is grounded.

[0069] Specifically, as Figure 1 shown, the second capacitor C2 can be used as a filtering capacitor, for example. The second capacitor C2 is connected to the level input signal NTC_signal_IN. There may be abnormal electrical signals such as high-frequency signals or clutter signals in the level input signal NTC_signal_IN. If these abnormal electrical signals are output outward, it may affect the normal use of the NTC temperature sensor sampling voltage dividing circuit 1. For this reason, in the embodiments of the present disclosure, the first end of the second capacitor C2 is connected to the level input signal NTC_signal_IN, and the high-frequency signals or clutter signals in the level input signal NTC_signal_IN applied to the second capacitor C2 are filtered by the second capacitor C2, avoiding damage to the circuit and improving the safety of the circuit.

[0070] The second capacitor C2 can also be used as an input capacitor of the port, for example. The second capacitor C2 is used to charge the sampling capacitor in the ADC module.

[0071] Optionally, as Figure 1 shown, the NTC temperature sensor sampling voltage dividing circuit 1 further includes: a third resistor R3, the first end of the third resistor R3 is electrically connected to the output end of the first gating module 11 and the output end of the second gating module 12, and the second end of the third resistor R3 is connected to the divided voltage signal MCU_ADC.

[0072] Specifically, as Figure 1 shown, the third resistor R3 can be used as a current limiting resistor, for example, to limit the current flowing into the sampling output end. At the same time, the third resistor R3 can also play a role in voltage division, avoiding excessive current in the circuit from burning out the sampling output end. It should be noted that the resistance value, type and material of the third resistor R3 can be selected according to the actual use requirements of the circuit, and the embodiments of the present disclosure do not limit this.

[0073] In some embodiments, as Figure 1As shown, the NTC temperature sensor sampling voltage divider circuit 1 also includes a fourth resistor R4 and a fifth resistor R5, the first end of the fourth resistor R4 is electrically connected to the control end of the first switch tube Q1, the second end of the fourth resistor R4 is grounded, and the fourth resistor R4 serves as a pull-down resistor. The first end of the fifth resistor R5 is electrically connected to the control end of the second switch tube Q2, the second end of the fifth resistor R5 is electrically connected to the first end of the first switch tube Q1, and the fifth resistor R5 can be used as a current limiting resistor, for example. It should be noted that the resistance value and type of material of the fourth resistor R4 and the fifth resistor R5 can be selected according to the actual use requirements of the circuit, and the embodiment of the present disclosure does not limit this.

[0074] The disclosed embodiment sets the first gating module 11 and the second gating module 12 with different pull-up resistance values ​​to be turned on respectively based on the sampling enable signal MCU_EN, thereby dividing the voltage of the NTC temperature sensor measuring the temperature in different temperature ranges, avoiding the problem that a voltage dividing circuit with a single resistance value divides the voltage of the NTC temperature sensor, so that the NTC temperature sensor temperature can only ensure the accuracy of sampling in a single temperature range, while the accuracy of sampling in other temperature ranges decreases, thereby improving the sampling accuracy of the NTC temperature sensor in different temperature ranges.

[0075] The disclosed embodiment also provides an NTC temperature sensor sampling device, Figure 2 A schematic diagram of the structure of an NTC temperature sensor sampling device provided in an embodiment of the present disclosure is shown in FIG. Figure 2 As shown, the NTC temperature sensor sampling device includes the NTC temperature sensor sampling voltage divider circuit 1 provided in the above embodiment, and also includes:

[0076] NTC temperature sensor 2 and control module 3;

[0077] The NTC temperature sensor sampling voltage divider circuit 1 is electrically connected to the NTC temperature sensor and the control module 3 respectively;

[0078] The NTC temperature sensor 2 is used to collect the temperature of the surrounding area and input a level input signal to the NTC temperature sensor sampling voltage divider circuit 1. The control module 3 is used to send a sampling enable signal MCU_EN to the NTC temperature sensor sampling voltage divider circuit 1, and obtain the temperature value collected by the NTC temperature sensor 2 according to the voltage divider signal MCU_ADC output by the NTC temperature sensor sampling voltage divider circuit 1.

[0079] Specifically, combined Figure 1 and Figure 2The NTC temperature sensor sampling voltage divider circuit 1 and the control module 3 can be integrated into an ECU (Electronic Control Unit), for example. KL30 is the power supply of the ECU, the reference voltage VCC_ADC_REF is the power supply for the ADC module 31 and the pull-up source of the NTC temperature sensor 2, VCC_ADC is the power supply for the ADC module 31, and the NTC temperature sensor 2 can be, for example, an NTC thermistor, whose resistance value decreases as the temperature increases. When the NTC temperature sensor 2 collects the temperature of the surrounding area, its resistance value changes. The NTC temperature sensor sampling voltage divider circuit 1 and the NTC temperature sensor 2 are used for voltage division. The control module 3 includes, for example, an ADC module 31 to convert the voltage value into a digital signal AD value. The MCU can obtain the voltage division of the NTC temperature sensor 2 through the AD value, and then calculate the resistance value of the NTC temperature sensor 2. According to the corresponding relationship between the resistance value and the temperature value of the NTC temperature sensor 2, the temperature value collected by the NTC temperature sensor 2 is obtained.

[0080] Exemplarily, when the control module 3 obtains that the temperature range collected by the NTC temperature sensor 2 is, for example, 35°C to 125°C, the control module 3 sends, for example, a low-level signal or a high-impedance signal to the NTC temperature sensor sampling voltage divider circuit 1, and the second gating module 12 in the NTC temperature sensor sampling voltage divider circuit 1 is turned on, and the second resistor R2 in the second gating module 12 is used as a voltage divider resistor to divide the voltage with the NTC temperature sensor. When the control module 3 obtains that the temperature range collected by the NTC temperature sensor 2 is, for example, -40°C to 35°C, the control module 3 sends, for example, a high-level signal to the NTC temperature sensor sampling voltage divider circuit 1, and the first gating module 11 in the NTC temperature sensor sampling voltage divider circuit 1 is turned on, and the first resistor R1 in the first gating module 11 is used as a voltage divider resistor to divide the voltage with the NTC temperature sensor 2. Since the resistance values ​​of the first resistor R1 and the second resistor R2 are different, the corresponding sampling accuracy of the NTC temperature sensor 2 is also different, so the accuracy of the temperature collection of the NTC temperature sensor 2 in the full temperature range can be achieved.

[0081] Exemplarily, the first gating module 11 and the second gating module 12 may also be turned on alternately. For example, the temperature collection interval of the NTC temperature sensor 2 corresponding to the first gating module 11 is a high temperature interval, and the temperature collection interval of the NTC temperature sensor corresponding to the second gating module 12 is a low temperature interval. When the control module 3 determines that the temperature range collected by the NTC temperature sensor 2 is, for example, a high temperature interval based on the temperature value collected by the NTC temperature sensor 2 obtained by turning on the first gating module 11 and the temperature value collected by the NTC temperature sensor 2 obtained by turning on the second gating module 12, the control module 3 sends, for example, a high-level signal to the NTC temperature sensor sampling voltage divider circuit 1, so that the first resistor R1 in the first gating module 11 divides the voltage of the NTC temperature sensor.

[0082] It should be noted that the correspondence between the first gating module 11 and the second gating module 12 and the temperature interval can be set according to the actual sampling requirements of the NTC temperature sensor 2, and the embodiment of the present disclosure is not limited to this.

[0083] Figure 3 A simulation schematic diagram of the corresponding relationship between the AD value and temperature of an NTC temperature sensor sampling device provided in an embodiment of the present disclosure. Figure 3 The horizontal axis is temperature in °C, and the vertical axis is AD value. AD_typ represents the typical value of AD value, AD_max represents the maximum value of AD value, and AD_min represents the minimum value of AD value. Figure 3 It can be seen that in the first temperature range, for example, -40°C to -10°C, the first gating module 11 can be turned on, and the resistance value of the first resistor R1 in the first gating module 11 is selected as a voltage-dividing resistor, for example, 200k, and the sampling accuracy of the NTC temperature sensor 2 in the temperature range of -40°C to -10°C can reach about ±2°C. In the second temperature range of 80°C, the second gating module 12 can be turned on, and the second resistor R2 in the second gating module 12 is selected as a voltage-dividing resistor, for example, 1k, and the sampling accuracy of the NTC temperature sensor 2 at 80°C can reach about ±2°C, and the temperature between 10°C and 105°C is about ±2°C. In this way, the sampling accuracy of the NTC temperature sensor 2 in the temperature range of -40°C to 105°C can be achieved.

[0084] Figure 4 A simulation schematic diagram of the corresponding relationship between the AD value and temperature of another NTC temperature sensor sampling device provided in an embodiment of the present disclosure. Figure 4 The horizontal axis is temperature in °C, and the vertical axis is AD value. AD_typ represents the typical value of AD value, AD_max represents the maximum value of AD value, and AD_min represents the minimum value of AD value. Figure 4It can be known that when the resistance value of the first resistor R1 is 31.6 kΩ for theoretical calculation, the AD value corresponding to -40°C has an obvious difference compared with the AD value of 4000 corresponding to the faults of short circuit to the power supply and open circuit, which can realize the distinction from the faults and avoid the problems of false alarms or inability to identify faults.

[0085] In the embodiment of the present disclosure, the first gating module and the second gating module with different pull-up resistance values are respectively turned on based on the sampling enable signal, so as to divide the voltage of the NTC temperature sensor for temperature measurement in different temperature ranges, avoiding the voltage division of the NTC temperature sensor by a voltage division circuit with a single resistance value, which makes the temperature of the NTC temperature sensor can only ensure the sampling accuracy in a single temperature range, while the sampling accuracy in other temperature ranges decreases. The sampling accuracy of the NTC temperature sensor in different temperature ranges is improved, and then the correct diagnosis of faults is realized, improving the safety of the vehicle.

[0086] The embodiment of the present disclosure also provides a vehicle, and the vehicle includes the NTC temperature sensor sampling device as described in the above embodiment. Therefore, the vehicle provided by the embodiment of the present disclosure has the beneficial effects described in the above embodiment.

[0087] In addition, the vehicle described in the embodiment of the present disclosure can be a fuel vehicle, a pure electric vehicle, or a hybrid vehicle, etc., and the embodiment of the present disclosure does not make specific limitations thereto.

[0088] It should be noted that in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of another identical element in the process, method, article or device including the element.

[0089] The above are only specific embodiments of the present disclosure, enabling those skilled in the art to understand or implement the present disclosure. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A NTC temperature sensor sampling voltage divider circuit, It is characterized in that include: at least one first gating module and at least one second gating module; The enable end of the first gating module and the enable end of the second gating module are both connected to a sampling enable signal, the input end of the first gating module and the input end of the second gating module are both connected to a level input signal, and the output end of the first gating module and the output end of the second gating module output a voltage division signal; wherein the pull-up resistance values ​​of the first gating module and the second gating module are different, and the level input signal is input by an NTC temperature sensor; The sampling enable signal controls the first gating module or the second gating module to be turned on, so as to divide the voltage of the NTC temperature sensor measuring temperature in different temperature ranges.

2. The NTC temperature sensor sampling voltage divider circuit according to claim 1, It is characterized in that The first gating module includes: a first switch unit and a first resistor; The first end of the first switch unit is connected to the sampling enable signal, the second end of the first switch unit is connected to the reference voltage, the third end of the first switch unit is electrically connected to the first end of the first resistor, the second end of the first resistor is connected to the level input signal, and the fourth end of the first switch unit is grounded.

3. The NTC temperature sensor sampling voltage divider circuit according to claim 2, It is characterized in that The first switch unit includes: a first switch tube and a second switch tube; The control end of the first switch tube is connected to the sampling enable signal, the first end of the first switch tube is electrically connected to the control end of the second switch tube, the second end of the first switch tube is grounded, the first end of the second switch tube is electrically connected to the first resistor, and the second end of the second switch tube is connected to the reference voltage.

4. The NTC temperature sensor sampling voltage divider circuit according to claim 1, It is characterized in that The second gating module includes: a second switch unit and a second resistor; The first end of the second switch unit is connected to the sampling enable signal, the first end of the second switch unit is electrically connected to the first end of the second resistor, the second end of the second switch unit is connected to the reference voltage, and the second end of the second resistor is connected to the level input signal.

5. The NTC temperature sensor sampling voltage divider circuit according to claim 4, It is characterized in that The second switch unit includes: a third switch tube; The control end of the third switch tube is connected to the sampling enable signal, the first end of the third switch tube is electrically connected to the second resistor, and the second end of the third switch tube is connected to the reference voltage.

6. The NTC temperature sensor sampling voltage divider circuit according to claim 1, It is characterized in that Also includes: An electrostatic protection module, the electrostatic protection module comprising: A first capacitor, wherein a first end of the first capacitor is connected to the level input signal, and a second end of the first capacitor is grounded.

7. The NTC temperature sensor sampling voltage divider circuit according to claim 1, It is characterized in that Also includes: A second capacitor, wherein a first end of the second capacitor is electrically connected to an output end of the first gating module and an output end of the second gating module, and a second end of the second capacitor is grounded.

8. The NTC temperature sensor sampling voltage divider circuit according to claim 1, It is characterized in that Also includes: A third resistor, wherein a first end of the third resistor is electrically connected to an output end of the first gating module and an output end of the second gating module, and a second end of the third resistor is connected to the voltage division signal.

9. An NTC temperature sensor sampling device, It is characterized in that The NTC temperature sensor sampling voltage divider circuit according to any one of claims 1 to 8 further comprises: NTC temperature sensor and control module; The NTC temperature sensor sampling voltage divider circuit is electrically connected to the NTC temperature sensor and the control module respectively; The NTC temperature sensor is used to collect the temperature of the surrounding area and input the level input signal to the NTC temperature sensor sampling voltage divider circuit. The control module is used to send the sampling enable signal to the NTC temperature sensor sampling voltage divider circuit, and obtain the temperature value collected by the NTC temperature sensor according to the voltage divider signal output by the NTC temperature sensor sampling voltage divider circuit.

10. A vehicle, It is characterized in that It comprises the NTC temperature sensor sampling device as claimed in claim 9.

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