CN219161496U - Temperature detection circuit and electronic equipment - Google Patents
Temperature detection circuit and electronic equipment Download PDFInfo
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- CN219161496U CN219161496U CN202223473783.4U CN202223473783U CN219161496U CN 219161496 U CN219161496 U CN 219161496U CN 202223473783 U CN202223473783 U CN 202223473783U CN 219161496 U CN219161496 U CN 219161496U
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Abstract
The embodiment of the application provides a temperature detection circuit and electronic equipment, wherein the temperature detection circuit comprises a first temperature sensing unit, and the first temperature sensing unit is configured to acquire a temperature signal and convert the temperature signal into a corresponding first voltage signal; the first signal amplifying unit is connected with the first temperature sensing unit and is configured to amplify the first voltage signal to obtain a second voltage signal; the control unit comprises a first detection pin and a second detection pin, the first detection pin is connected with the first temperature sensing unit, the second detection pin is connected with the first signal amplifying unit, and the control unit is configured to detect the first voltage signal and/or the second voltage signal so as to determine a temperature value corresponding to the temperature signal. By the mode, the accuracy of temperature detection can be improved.
Description
Technical Field
The application relates to the technical field of temperature detection, in particular to a temperature detection circuit and electronic equipment.
Background
Electronic devices in general need to operate in a suitable temperature environment, and in particular, electronic products like batteries, temperature anomalies can cause electronic device failures to create a safety hazard. The temperature sensor (temperature transducer) is a sensor that senses temperature and converts it into a usable output signal. The temperature sensor is a core part of the temperature measuring instrument and has various varieties. The measuring method can be divided into two main types, namely contact type and non-contact type, and the measuring method can be divided into two types, namely thermal resistor and thermocouple according to the characteristics of sensor materials and electronic elements.
Taking a thermistor as an example, the resistance value of the thermistor changes along with the change of temperature, so that the corresponding temperature value can be correspondingly calculated by detecting the resistance value of the thermistor. However, the resistance of the thermistor is not linear with temperature, and when the temperature is high, the resistance of the thermistor gradually decreases, which results in different temperature environments, namely, the temperature measurement by the thermistor is different in accuracy, i.e., the temperature detection result is not accurate enough.
Disclosure of Invention
The embodiment of the application provides a temperature detection circuit and electronic equipment, which are used for solving the problem of inaccurate temperature detection results in the related technology.
The application provides a temperature detection circuit, this temperature detection circuit includes: the first temperature sensing unit is configured to acquire a temperature signal and convert the temperature signal into a corresponding first voltage signal; the first signal amplifying unit is connected with the first temperature sensing unit and is configured to amplify the first voltage signal to obtain a second voltage signal; the control unit comprises a first detection pin and a second detection pin, the first detection pin is connected with the first temperature sensing unit, the second detection pin is connected with the first signal amplifying unit, and the control unit is configured to detect the first voltage signal and/or the second voltage signal so as to determine a temperature value corresponding to the temperature signal.
In some embodiments, the first temperature sensing unit comprises: a first resistor, a first end of which is configured to input a power supply voltage; the first end of the thermistor is connected with the second end of the first resistor, the first detection pin and the first signal amplifying unit are connected, and the second end of the thermistor is grounded.
In some embodiments, the first temperature sensing unit further comprises: and the first end of the filter capacitor is connected with the first end of the thermistor, and the second end of the filter capacitor is grounded.
In some embodiments, the first resistance is a tunable resistor.
In some embodiments, the thermistor is a negative temperature coefficient thermistor.
In some embodiments, the signal amplifying unit includes: the output end of the first operational amplifier is connected with the second detection pin; the first end of the second resistor is connected with the first temperature sensing unit, and the second end of the second resistor is connected with the first input end of the first operational amplifier; the first end of the third resistor is connected with the second input end of the first operational amplifier, and the second end of the third resistor is grounded; and the first end of the fourth resistor is connected with the second input end of the first operational amplifier, and the second end of the fourth resistor is connected with the output end of the first operational amplifier.
In some embodiments, the temperature detection circuit further includes a voltage follower unit, the voltage follower unit being connected to the first temperature sensing unit and the first detection pin.
In some embodiments, the voltage follower unit includes: the output end of the second operational amplifier is connected with the first detection pin; the first end of the fifth resistor is connected with the first temperature sensing unit, and the second end of the fifth resistor is connected with the first input end of the second operational amplifier; and the first end of the sixth resistor is connected with the second input end of the second operational amplifier, and the second end of the sixth resistor is connected with the output end of the second operational amplifier.
In some embodiments, the temperature detection circuit further comprises: the second temperature sensing unit is configured to acquire a temperature signal and convert the temperature signal into a corresponding third voltage signal; the second signal amplifying unit is connected with the second temperature sensing unit and is configured to amplify the third voltage signal to obtain a fourth voltage signal; the control unit further comprises a third detection pin and a fourth detection pin, the third detection pin is connected with the second temperature sensing unit, the fourth detection pin is connected with the second signal amplifying unit, and the control unit is configured to detect the first voltage signal and the third voltage signal to determine a temperature value corresponding to the temperature signal or detect the second voltage signal and the fourth voltage signal to determine a temperature value corresponding to the temperature signal.
The temperature detection circuit provided by the embodiment of the application comprises: the first temperature sensing unit is configured to acquire a temperature signal and convert the temperature signal into a corresponding first voltage signal; the first signal amplifying unit is connected with the first temperature sensing unit and is configured to amplify the first voltage signal to obtain a second voltage signal; the control unit comprises a first detection pin and a second detection pin, the first detection pin is connected with the first temperature sensing unit, the second detection pin is connected with the first signal amplifying unit, and the control unit is configured to detect the first voltage signal and/or the second voltage signal so as to determine a temperature value corresponding to the temperature signal. Through the mode, the temperature detection circuit of the embodiment obtains two temperature values through the two detection channels, can be suitable for different temperature environments, can solve the problem that the resistance value of the thermistor is insensitive to temperature change under certain temperature conditions, and can also meet the detection range of the ADC module in an adaptive manner through the two detection channels, so that the detection precision of the final temperature is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a first embodiment of a temperature detection circuit provided in the present application;
FIG. 2 is a schematic diagram of a second embodiment of a temperature detection circuit provided herein;
FIG. 3 is a schematic diagram of a third embodiment of a temperature detection circuit provided herein;
fig. 4 is a schematic structural diagram of a fourth embodiment of a temperature detection circuit provided in the present application;
FIG. 5 is a schematic diagram of a fifth embodiment of a temperature detection circuit provided herein;
fig. 6 is a schematic structural diagram of an embodiment of an electronic device provided in the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate an orientation or positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
"A and/or B" includes the following three combinations: only a, only B, and combinations of a and B.
The use of "adapted" or "configured to" in this application is meant to be open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps. In addition, the use of "based on" is intended to be open and inclusive in that a process, step, calculation, or other action "based on" one or more of the stated conditions or values may be based on additional conditions or beyond the stated values in practice.
In this application, the term "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the application. In the following description, details are set forth for purposes of explanation. It will be apparent to one of ordinary skill in the art that the present application may be practiced without these specific details. In other instances, well-known structures and processes have not been shown in detail to avoid obscuring the description of the present application with unnecessary detail. Thus, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a first embodiment of a temperature detection circuit provided in the present application, where the temperature detection circuit 100 includes a first temperature sensing unit 11, a first signal amplifying unit 21 and a control unit 30, the first signal amplifying unit 21 is connected to the first temperature sensing unit 11, the control unit 30 includes a first detection pin ADC1 and a second detection pin ADC2, the first detection pin ADC1 is connected to the first temperature sensing unit 11, and the second detection pin ADC2 is connected to the first signal amplifying unit 21.
Optionally, the first temperature sensor 11 includes at least one thermistor, where the thermistor is generally made of a conductive material, and most of the thermistor has a negative temperature coefficient, i.e. the resistance decreases with increasing temperature. The temperature change causes a large resistance change, so it is the most sensitive temperature sensor. However, the linearity of the thermistor is extremely poor and has a great relation to the production process.
The thermistor is very small in size and responds quickly to temperature changes. However, the thermistor requires the use of a current source, and its small size also makes it extremely sensitive to self-heating errors. The thermistor measures absolute temperature on two lines, has better precision, but is more expensive than thermal couple, and the measurable temperature range is smaller Yu Reou. A typical thermistor has a resistance of 5kΩ at 25℃and a resistance change of 200 Ω per 1℃temperature change. Note that the 10 Ω lead resistance only causes a negligible error of 0.05 ℃. It is well suited for current control applications where fast and sensitive temperature measurements are required. The small size is advantageous for space demanding applications, but care must be taken to prevent self-heating errors.
Wherein the first temperature sensing unit 11 is configured to acquire a temperature signal and convert the temperature signal into a corresponding first voltage signal V1; the first signal amplifying unit 21 is configured to amplify the first voltage signal V1 to obtain a second voltage signal V2; the control unit 30 is configured to detect the first voltage signal V1 and/or the second voltage signal V2 to determine a temperature value corresponding to the temperature signal.
Optionally, an analog-to-digital conversion module (ADC) is integrated into the control unit 30, and is mainly used for converting an analog signal into a digital signal. Analog-to-digital conversion typically involves several steps, sampling, quantization, and encoding. Sampling refers to replacing the original temporally continuous signal with a sequence of signal samples at regular intervals, i.e. discretizing the analog signal in time. Quantization is to approximate the original continuously varying amplitude value with a limited number of amplitude values, changing the continuous amplitude of the analog signal to a limited number of discrete values with certain intervals. The coding is to represent the quantized value by binary digits according to a certain rule, and then convert the binary or multi-valued digital signal stream.
In this embodiment, the temperature detection mainly includes two detection channels:
the first detection channel is configured to directly input a first voltage signal V1 determined by performing temperature detection by the first temperature sensing unit 11 to the first detection pin ADC1, so as to perform subsequent analog-to-digital conversion to determine a voltage value corresponding to the first voltage signal V1, a resistance value corresponding to the voltage value, and a temperature value corresponding to the resistance value, thereby obtaining a temperature detection result.
The second detection channel is to amplify the first voltage signal V1 determined by the temperature detection performed by the first temperature sensing unit 11 to obtain a second voltage signal V2, and input the second voltage signal V2 to the second detection pin ADC2 to perform subsequent analog-to-digital conversion to determine a voltage value corresponding to the second voltage signal V2, a resistance value corresponding to the voltage value, and a temperature value corresponding to the resistance value, thereby obtaining a temperature detection result.
It will be appreciated that the above detection mode using two detection channels mainly takes into account the following factors:
firstly, the resistance value of the thermistor is not in a linear relation with the temperature change, when the temperature reaches a certain value, the resistance value of the thermistor is very small with the temperature change, the voltage change at two ends of the thermistor is very small, the measurement precision of the ADC module is required to be higher, and when the ADC precision is insufficient, the small voltage change cannot be detected.
Therefore, the second detection channel in this embodiment may amplify the voltage signal before detecting the voltage signal, so as to amplify the fine change of the voltage, thereby facilitating detection by the ADC module.
Second, the ADC module has a certain measuring range, for a general measuring device, if the measured value of the target to be measured is located in the middle area of the measuring range, the measuring result is more accurate, and if the measured value of the target to be measured is located in the edge area of the measuring range, the general error of the measuring result is larger. For example, the measuring range of the ADC module is 0% -100%, if the measured value of the target to be measured is 10% -90% of the measuring range, the measuring requirement is met, and if the measured value of the target to be measured is 0% -10% or 90% -100%, the measuring result may deviate, and the measuring requirement is not met.
Therefore, the second detection channel in this embodiment can amplify the voltage signal when the voltage signal does not meet the range requirement of the ADC, thereby meeting the range requirement of the ADC module, and facilitating improvement of measurement accuracy.
Alternatively, in an embodiment, the first temperature value may be determined by the first detection channel and the second temperature value may be determined by the second detection channel, and the final detection result may be determined in the following manner.
Mode one: the final result is determined based on the temperature interval of the first temperature value and the second temperature value.
Two temperature intervals can be preset, when the thermistor is placed in the environment of the first temperature interval, the resistance value of the thermistor changes greatly along with the temperature, and when the thermistor is placed in the environment of the second temperature interval, the resistance value of the thermistor changes less along with the temperature. Therefore, when the first temperature value and the second temperature value are located in the first temperature interval, the resistance value of the thermistor changes normally along with the temperature, the first temperature value is taken as a final result, and when the first temperature value and the second temperature value are located in the second temperature interval, the resistance value of the thermistor changes slowly along with the temperature, and the second temperature value is taken as a final result.
For example, an NTC thermistor is exemplified, which has a resistance value that slowly changes with a temperature change under a high temperature condition. If the ambient temperature is-40-150 ℃, the first temperature interval can be defined as-40-60 ℃ and the second temperature interval is 60-150 ℃, so that when the first temperature value and the second temperature value are at-40-60 ℃, the first temperature value is taken as a final result, and when the first temperature value and the second temperature value are at 60-150 ℃, the second temperature value is taken as a final result.
Mode two: and determining a final result based on the ADC measuring range corresponding to the first temperature value and the second temperature value.
The first temperature value determined by the first detection channel can be determined first, the range of the first temperature value in the measuring range of the ADC module is judged, and if the first temperature value is in the middle range of the measuring range of the ADC, for example, 10% -90%, the first temperature value is directly determined as a final result; if the first temperature value is in the edge range of the ADC range or exceeds the range of the ADC range, the accuracy of the first detection channel is considered to be unable to meet the requirement, and the second temperature value is adopted to determine as a final result.
Other modes: in addition to the two ways described above, other ways of determining the final result may be used, such as directly averaging the first temperature value and the second temperature value.
The temperature detection circuit provided in this embodiment includes: the first temperature sensing unit is configured to acquire a temperature signal and convert the temperature signal into a corresponding first voltage signal; the first signal amplifying unit is connected with the first temperature sensing unit and is configured to amplify the first voltage signal to obtain a second voltage signal; the control unit comprises a first detection pin and a second detection pin, the first detection pin is connected with the first temperature sensing unit, the second detection pin is connected with the first signal amplifying unit, and the control unit is configured to detect the first voltage signal and/or the second voltage signal so as to determine a temperature value corresponding to the temperature signal. Through the mode, the temperature detection circuit of the embodiment obtains two temperature values through the two detection channels, can be suitable for different temperature environments, can solve the problem that the resistance value of the thermistor is insensitive to temperature change under certain temperature conditions, and can also meet the detection range of the ADC module in an adaptive manner through the two detection channels, so that the detection precision of the final temperature is improved.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a second embodiment of a temperature detection circuit provided in the present application, and the temperature detection circuit 100 includes a first temperature sensing unit 11, a first signal amplifying unit 21, and a control unit 30.
Wherein the control unit 30 includes a first detection pin ADC1 and a second detection pin ADC2, the first temperature sensing unit 11 includes a first resistor R1 and a thermistor R0, and a first end of the first resistor R1 is configured to input a power supply voltage VCC; the first end of the thermistor R0 is connected with the second end of the first resistor R1 and connected with the first detection pin ADC1 and the first signal amplifying unit 21, the second end of the thermistor R0 is grounded GND, and the second detection pin ADC2 is connected with the first signal amplifying unit 21.
The first resistor R1 is used for dividing the power supply voltage VCC, namely:
V1＝VCC*R0/(R1+R0)
optionally, in an embodiment, the first resistor R1 is configured to be adjustable in resistance, for example, a potentiometer may be used.
Alternatively, in one embodiment, the thermistor R0 is a negative temperature coefficient thermistor, i.e., its resistance decreases with increasing temperature.
Optionally, the first temperature sensing unit 11 further includes a filter capacitor C1, a first end of the filter capacitor C1 is connected to a first end of the thermistor R0, and a second end of the filter capacitor C1 is grounded GND.
In the present embodiment, since the thermistor R0 is a negative temperature coefficient thermistor, the higher the temperature is, the lower the resistance value of the thermistor R0 and thus the lower the voltage across the thermistor R0 (i.e., the first voltage signal V1). If the first channel is used for detection, the first voltage value is insensitive to change, the second voltage value is too low and may be located in the edge region of the ADC range, and the first temperature value may be inaccurate. The signal of the second detection channel is amplified, so that the tiny voltage change is amplified, and the detection range of the ADC module is more met.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a third embodiment of a temperature detection circuit provided in the present application, and the temperature detection circuit 100 includes a first temperature sensing unit 11, a first signal amplifying unit 21, and a control unit 30.
The signal amplifying unit comprises a first operational amplifier U1, a second resistor R2, a third resistor R3 and a fourth resistor R4. The output end of the first operational amplifier U1 is connected with a second detection pin ADC2; the first end of the second resistor R2 is connected with the first temperature sensing unit 11, and the second end of the second resistor R2 is connected with the first input end (non-inverting input end) of the first operational amplifier U1; the first end of the third resistor R3 is connected with the second input end (inverting input end) of the first operational amplifier U1, and the second end of the third resistor R3 is grounded to GND; the first end of the fourth resistor R4 is connected with the second input end of the first operational amplifier U1, and the second end of the fourth resistor R4 is connected with the output end of the first operational amplifier U1.
It should be understood that the first signal amplifying unit 21 is mainly an in-phase proportional operational amplifying circuit, in which:
V2＝(1+R4/R3)V1
therefore, the amplification factor of the first signal amplifying unit 21 can be controlled by adjusting the resistance values of the third resistor R3 and the fourth resistor R4.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a fourth embodiment of a temperature detection circuit provided herein, where the temperature detection circuit 100 includes a first temperature sensing unit 11, a first signal amplifying unit 21, a control unit 30, and a voltage following unit 40, and the voltage following unit 40 connects the first temperature sensing unit 11 and a first detection pin ADC1.
The voltage follower unit 40 includes a second operational amplifier U2, a fifth resistor R5, and a sixth resistor R6, where an output end of the second operational amplifier U2 is connected to the first detection pin ADC1; the first end of the fifth resistor R5 is connected with the first temperature sensing unit 11, and the second end of the fifth resistor R5 is connected with the first input end (non-inverting input end) of the second operational amplifier U2; the first end of the sixth resistor R6 is connected to the second input end (inverting input end) of the second operational amplifier U2, and the second end of the sixth resistor R6 is connected to the output end of the second operational amplifier U2.
It will be appreciated that the voltage follower acts as an impedance match, avoiding the influence of the ADC sampling process on the voltage (V1) across the thermistor.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a fifth embodiment of a temperature detection circuit provided in the present application, where the temperature detection circuit 100 includes a first temperature sensing unit 11, a first signal amplifying unit 21, a second temperature sensing unit 12, a second signal amplifying unit 22, and a control unit 30, and the control unit 30 includes a first detection pin ADC1, a second detection pin ADC2, a third detection pin ADC3, and a fourth detection pin ADC4.
The first signal amplifying unit 21 is connected to the first temperature sensing unit 11, the first detection pin ADC1 is connected to the first temperature sensing unit 11, and the second detection pin ADC2 is connected to the first signal amplifying unit 21. The second signal amplifying unit 22 is connected to the second temperature sensing unit 12, the third detection pin ADC3 is connected to the second temperature sensing unit 12, and the fourth detection pin ADC4 is connected to the second signal amplifying unit 22.
Further, the first temperature sensing unit 11 is configured to acquire a temperature signal and convert the temperature signal into a corresponding first voltage signal V1; the first signal amplifying unit 21 is configured to amplify the first voltage signal V1 to obtain a second voltage signal V2. The second temperature sensing unit 12 is configured to acquire a temperature signal and convert the temperature signal into a corresponding third voltage signal V3; the second signal amplifying unit 22 is configured to amplify the third voltage signal V3 to obtain a fourth voltage signal V4.
Further, the control unit 30 is configured to detect the first voltage signal V1 and the third voltage signal V3 to determine a temperature value corresponding to the temperature signal, or to detect the second voltage signal V2 and the fourth voltage signal V4 to determine a temperature value corresponding to the temperature signal.
Specifically, the first temperature value of the first detection channel may be determined, for example, by averaging, according to the first voltage signal V1 and the third voltage signal V3, and the second temperature value of the second detection channel may be determined, for example, by averaging, according to the second voltage signal V2 and the fourth voltage signal V4. The final detection result is determined based on the two detection channels, and reference may be made to the above-mentioned first embodiment, which is not described here again.
Referring to fig. 6, fig. 6 is a schematic structural diagram of an embodiment of an electronic device 600 provided in the present application, where the electronic device 600 includes a temperature detection circuit 100, and the temperature detection circuit 100 is a temperature detection circuit as described in the above embodiment.
The electronic device 600 may be a device including a temperature detection function, and in an embodiment, the electronic device 600 may be an automobile, and the temperature detection function is mainly applied to temperature detection in a battery box in a BMS (battery management) system of the automobile.
The foregoing has outlined rather broadly the more detailed description of embodiments of the present application, wherein specific examples are provided herein to illustrate the principles and embodiments of the present application, the above examples being provided solely to assist in the understanding of the methods of the present application and the core ideas thereof; meanwhile, those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present application, and the present description should not be construed as limiting the present application in view of the above.
Claims (10)
1. A temperature detection circuit, the temperature detection circuit comprising:
the first temperature sensing unit is configured to acquire a temperature signal and convert the temperature signal into a corresponding first voltage signal;
the first signal amplifying unit is connected with the first temperature sensing unit and is configured to amplify the first voltage signal to obtain a second voltage signal;
the control unit comprises a first detection pin and a second detection pin, the first detection pin is connected with the first temperature sensing unit, the second detection pin is connected with the first signal amplifying unit, and the control unit is configured to detect the first voltage signal and/or the second voltage signal so as to determine a temperature value corresponding to the temperature signal.
2. The temperature detection circuit according to claim 1, wherein,
the first temperature sensing unit includes:
a first resistor, a first end of which is configured to input a power supply voltage;
and the first end of the thermistor is connected with the second end of the first resistor, the first detection pin is connected with the first signal amplifying unit, and the second end of the thermistor is grounded.
3. The temperature detection circuit according to claim 2, wherein,
the first temperature sensing unit further includes:
and the first end of the filter capacitor is connected with the first end of the thermistor, and the second end of the filter capacitor is grounded.
4. The temperature detection circuit according to claim 2, wherein,
the first resistance is an adjustable resistor.
5. The temperature detection circuit according to claim 2, wherein,
the thermistor is a negative temperature coefficient thermistor.
6. The temperature detection circuit according to claim 1, wherein,
the signal amplifying unit includes:
the output end of the first operational amplifier is connected with the second detection pin;
the first end of the second resistor is connected with the first temperature sensing unit, and the second end of the second resistor is connected with the first input end of the first operational amplifier;
the first end of the third resistor is connected with the second input end of the first operational amplifier, and the second end of the third resistor is grounded;
and the first end of the fourth resistor is connected with the second input end of the first operational amplifier, and the second end of the fourth resistor is connected with the output end of the first operational amplifier.
7. The temperature detection circuit according to claim 1, wherein,
the temperature detection circuit further comprises a voltage following unit, and the voltage following unit is connected with the first temperature sensing unit and the first detection pin.
8. The temperature detection circuit according to claim 7, wherein,
the voltage follower unit includes:
the output end of the second operational amplifier is connected with the first detection pin;
a first end of the fifth resistor is connected with the first temperature sensing unit, and a second end of the fifth resistor is connected with the first input end of the second operational amplifier;
and the first end of the sixth resistor is connected with the second input end of the second operational amplifier, and the second end of the sixth resistor is connected with the output end of the second operational amplifier.
9. The temperature detection circuit according to claim 1, wherein,
the temperature detection circuit further includes:
the second temperature sensing unit is configured to acquire a temperature signal and convert the temperature signal into a corresponding third voltage signal;
the second signal amplifying unit is connected with the second temperature sensing unit and is configured to amplify the third voltage signal to obtain a fourth voltage signal;
the control unit further comprises a third detection pin and a fourth detection pin, the third detection pin is connected with the second temperature sensing unit, the fourth detection pin is connected with the second signal amplifying unit, and the control unit is configured to detect the first voltage signal and the third voltage signal to determine a temperature value corresponding to the temperature signal or detect the second voltage signal and the fourth voltage signal to determine a temperature value corresponding to the temperature signal.
10. An electronic device comprising a temperature detection circuit according to any one of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223473783.4U CN219161496U (en) | 2022-12-23 | 2022-12-23 | Temperature detection circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223473783.4U CN219161496U (en) | 2022-12-23 | 2022-12-23 | Temperature detection circuit and electronic equipment |
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| CN219161496U true CN219161496U (en) | 2023-06-09 |
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| CN202223473783.4U Active CN219161496U (en) | 2022-12-23 | 2022-12-23 | Temperature detection circuit and electronic equipment |
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