Temperature detection circuit and related chip and related charging device

Abstract

The embodiment of the present application discloses a temperature detection circuit and related chip and related charging device, the temperature detection circuit includes: temperature regulating circuit and temperature sensitive resistance, the temperature regulating circuit includes: dynamic current source, control circuit and ADC circuit, wherein, the dynamic current source connects the control circuit, the ADC circuit and the temperature sensitive resistance, the ADC circuit connects one end of the temperature sensitive resistance and the control circuit, and the other end of the temperature sensitive resistance is grounded;The dynamic current source is used for generating a first current;The ADC circuit is used for forming a first voltage based on the first current and the resistance value of the temperature sensitive resistance;The control circuit is used for adjusting the current value of the dynamic current source through the first voltage and a preset time threshold, obtaining a second current, and controlling the temperature sensitive resistance to work through the second current. The embodiment of the present application can realize accurate temperature detection of the product.

Description

Technical Field

[0001] This application relates to the field of electronic technology, specifically to a temperature detection circuit, related chip, and related charging device. Background Technology

[0002] With the widespread adoption of fast charging protocols and the rapid development of the power bank, energy storage product, smart power strip, and other electronic product markets, charging and discharging power is increasing. The presence of internal resistance causes these products to overheat during high-power charging and discharging. Furthermore, domestic and international certification and testing standards are increasingly emphasizing temperature protection for these products. Therefore, the accuracy of temperature detection for these products has become even more critical, making it essential to address the challenge of achieving precise temperature monitoring. Summary of the Invention

[0003] This application provides a temperature detection circuit, related chips, and related charging devices, which can achieve accurate temperature detection of products.

[0004] In a first aspect, embodiments of this application provide a temperature detection circuit, the temperature detection circuit comprising: a temperature regulation module and a thermistor, the temperature regulation module comprising: a dynamic current source, a control circuit, and an ADC module, wherein... The dynamic current source is connected to the control circuit, the ADC module, and the thermistor. The ADC module is connected to one end of the thermistor and the control circuit, and the other end of the thermistor is grounded. The dynamic current source is used to generate the first current; The ADC module is used to generate a first voltage based on the first current and the resistance value of the thermistor; The control circuit is used to adjust the current value of the dynamic current source by the first voltage and a preset time threshold to obtain a second current, and to control the temperature-sensitive resistor to work by the second current.

[0005] Secondly, embodiments of this application provide a chip, the chip including a temperature detection circuit as described in the first aspect.

[0006] Thirdly, embodiments of this application provide a charging device, wherein the charger includes a temperature detection circuit as described in the first aspect or a chip as described in the second aspect.

[0007] Implementing the embodiments of this application has the following beneficial effects: As can be seen, the temperature detection circuit, chip, and charging device described in the embodiments of this application include a temperature detection circuit comprising a temperature adjustment module and a thermistor. The temperature adjustment module comprises a dynamic current source, a control circuit, and an ADC module. The dynamic current source is connected to the control circuit, the ADC module, and the thermistor. The ADC module is connected to one end of the thermistor and the control circuit, and the other end of the thermistor is grounded. The dynamic current source generates a first current. The ADC module forms a first voltage based on the first current and the resistance value of the thermistor. The control circuit adjusts the current value of the dynamic current source according to the first voltage and a preset time threshold to obtain a second current. The second current controls the thermistor to operate. Thus, the voltage of the thermistor can be detected by the ADC module, reflecting the product temperature. The current of the dynamic current source can be adjusted according to the voltage and its corresponding duration, thereby achieving accurate identification of the product temperature and realizing precise protection. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 This is a schematic diagram of the structure of a temperature detection circuit provided in an embodiment of this application; Figure 2 This is a schematic diagram of another temperature detection circuit provided in an embodiment of this application; Figure 3 This is a schematic diagram of another temperature detection circuit provided in an embodiment of this application; Figure 4 This is a current switching logic diagram of a dynamic current temperature detection circuit provided in an embodiment of this application; Figure 5 This is a flowchart of a dynamic current temperature detection circuit protection provided in an embodiment of this application. Detailed Implementation

[0010] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0011] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0012] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0013] The embodiments of this application will be described in detail below.

[0014] Please see Figure 1 , Figure 1 This is a schematic diagram of a temperature detection circuit provided in an embodiment of this application. As shown in the figure, the temperature detection circuit includes a temperature adjustment module and a thermistor. The temperature adjustment module is used to detect the temperature of the thermistor and dynamically adjust the current of the thermistor to achieve accurate temperature identification of the detected product.

[0015] In practice, the temperature regulation module can be integrated into a chip. The temperature regulation module includes pins, which are connected to one end of a thermistor, while the other end of the thermistor is grounded.

[0016] Furthermore, such as Figure 2 As shown, the temperature detection circuit includes: a temperature regulation module and a thermistor R1. The temperature regulation module includes: a dynamic current source, a control circuit, and an ADC module. The dynamic current source is connected to the control circuit, the ADC module, and the temperature-sensitive resistor R1. The ADC module is connected to one end of the temperature-sensitive resistor R1 and the control circuit, and the other end of the temperature-sensitive resistor R1 is grounded. The dynamic current source is used to generate the first current; The ADC module is used to generate a first voltage based on the first current and the resistance value of the thermistor R1; The control circuit is used to adjust the current value of the dynamic current source by the first voltage and a preset time threshold to obtain a second current, and to control the operation of the temperature-sensitive resistor R1 by the second current.

[0017] The ADC module is used to detect the temperature of the temperature-sensitive resistor R1 through the first current. Due to different temperatures, the control circuit has system logic control functions and / or filter timer functions.

[0018] In this specific implementation, the voltage is acquired by an ADC, and the output current of the current source is dynamically adjusted. The corresponding current is adjusted under different thermistor resistance values ​​to achieve high-precision temperature identification and control. Specifically, switching the current enables accurate temperature detection. After triggering protection, the power circuit module is adjusted. By adjusting the power module's power, losses are reduced, thus indirectly regulating the product temperature.

[0019] Of course, in this embodiment, the chip may not need a high-precision ADC module inside, and only a temperature-sensitive resistor is needed on the outside to achieve accurate identification of different temperatures, thereby reducing the design cost of the chip solution.

[0020] For example, a dynamic current source generates a current I. L A voltage V is generated between the external thermistor R1 and the external thermistor. adc1 V is determined by the internal system logic control circuit of the chip. adc1 The value, lasting T debounce After a certain period of time, the current can be quickly switched to generate current source I. H This forms another voltage V with R1. adc2 .

[0021] Optionally, in generating the first voltage based on the first current and the resistance value of the thermistor, the ADC module is specifically used for: Obtain the first current within a preset time period; Obtain the resistance value of the temperature-sensitive resistor during the preset time period; The first current is sampled to obtain multiple current values; The resistance value is sampled to obtain multiple resistance values; Based on the multiple current values ​​and the multiple resistance values, multiple reference voltages are obtained; Determine the target mean square error of the plurality of current values; The first voltage is determined based on the target mean square error and the plurality of reference voltages.

[0022] In the specific implementation, the preset time period can be preset or the system default, so that the first current of the preset time period can be obtained, and the resistance value of the temperature-sensitive resistor of the preset time period can also be obtained accordingly. Since the ADC originally detects analog signals, it can convert analog signals into digital signals. For example, the current of the analog signal can be converted into the current of the digital signal, and the resistance value of the analog signal can be converted into the resistance value of the digital signal.

[0023] Furthermore, the first current can be sampled to obtain multiple current values, and the resistance value can be sampled to obtain multiple resistance values. Based on the multiple current values ​​and multiple resistance values, multiple reference voltages can be obtained. That is, the product of the resistance value and the current value at the corresponding moment is the reference voltage. Since the resistance and current change constantly, it is necessary to determine the target mean square error of the multiple current values. The mean square error reflects the stability of the voltage change. The first voltage can be determined based on the target mean square error and the multiple reference voltages. In this way, an accurate voltage value can be obtained. This voltage value can accurately reflect the temperature change of the thermistor, which helps to improve the accuracy of the product's temperature protection.

[0024] Further, optionally, in determining the first voltage based on the target mean square error and the plurality of reference voltages, the ADC module is specifically configured to: Determine the target adjustment parameters based on the target mean square error; The average voltage is determined based on the plurality of reference voltages; The average voltage is adjusted according to the target adjustment parameter to obtain the first voltage.

[0025] In practice, a mapping relationship between the mean square error and the adjustment parameter can be preset. Then, the target adjustment parameter corresponding to the target mean square error can be determined based on the mapping relationship. The average voltage of multiple reference voltages can also be determined. The average voltage is adjusted by the target adjustment parameter to obtain the first voltage, i.e., the first voltage = (1 + target adjustment parameter) multiplied by the average voltage. In this way, the voltage value can be dynamically adjusted by the voltage stability reflected by the mean square error, making the voltage value detection more accurate.

[0026] Optionally, in the aspect of adjusting the current value of the dynamic current source through the first voltage and a preset time threshold to obtain the second current, the control circuit is specifically used for: Determine the target voltage level corresponding to the first voltage; Determine the preset time threshold corresponding to the target voltage level; The current value of the dynamic current source is adjusted according to the first voltage and the preset time threshold to obtain the second current.

[0027] In practice, a pre-defined mapping relationship between voltage levels and time thresholds can be set, meaning different voltage levels correspond to different time thresholds.

[0028] Specifically, the target voltage level corresponding to the first voltage can be determined, and then the preset time threshold corresponding to the target voltage level can be determined. Then, the current value of the dynamic current source can be adjusted according to the first voltage and the preset time threshold to obtain the second current. In specific implementation, when the first voltage is within the voltage range of the target voltage level, and the duration of the first voltage within the voltage range of the target voltage level exceeds the preset time threshold, the voltage value of the dynamic current source can be adjusted to obtain the second current. Then, the current of the thermistor can be adjusted using the second current.

[0029] In this embodiment, the temperature of the application product is more accurately identified in high and low temperature environments, protecting the reliability of the application product. In practical applications, it can also meet the temperature certification requirements of UL / EN / IEC62368-1.

[0030] Optionally, in the aspect of adjusting the current value of the dynamic current source through the first voltage and a preset time threshold to obtain the second current, the control circuit is specifically used for: When the first voltage is greater than the first voltage threshold, the first preset duration is used as the preset time threshold; Detecting a first duration during which the first voltage is greater than the first voltage threshold; When the first duration is longer than the first preset duration, the current value of the dynamic current source is adjusted to obtain a second current.

[0031] The first voltage threshold and the first preset duration can both be preset or set by system default.

[0032] In specific implementation, when the first voltage is greater than the first voltage threshold, the first preset duration can be used as the preset time threshold. The first duration for which the first voltage is greater than the first voltage threshold is detected. When the first duration is greater than the first preset duration, it indicates that the product temperature is relatively high for a long time. Then the current value of the dynamic current source can be adjusted to obtain the second current. In this way, the purpose of accurate temperature detection can be achieved.

[0033] Optionally, adjusting the current value of the dynamic current source to obtain the second current includes: Obtain the first preset current value; The dynamic current source is controlled to operate at the first preset current value to obtain the second current.

[0034] The first preset current value can be preset or set by the system default. This allows the dynamic current source to operate at the first preset current value, thus obtaining the second current. This enables dynamic adjustment of the operating current of the dynamic current source, thereby regulating the current of the temperature-sensitive resistor, ensuring both product temperature and operating efficiency.

[0035] Optionally, adjusting the current value of the dynamic current source to obtain the second current includes: Obtain the reference current value; Obtain the target ambient temperature; Determine the target influencing factor corresponding to the target ambient temperature; A second preset current value is determined based on the target influence factor and the reference current value; The dynamic current source is controlled to operate at the second preset current value to obtain the second current.

[0036] In practice, a pre-stored mapping relationship between ambient temperature and influencing factors can be used. Then, the target influencing factor corresponding to the target ambient temperature can be determined based on this mapping relationship. The second preset current value can then be determined based on the target influencing factor and the reference current value. This can be achieved using the following formula: Second preset current value = (1 + target influencing factor) multiplied by the reference current value. The dynamic current source is then controlled to operate at the second preset current value to obtain the second current. In the current adjustment process of the dynamic constant current source, the influence of ambient temperature is fully considered, which helps to further improve the temperature protection effect of the product.

[0037] Optionally, in the aspect of adjusting the current value of the dynamic current source through the first voltage and a preset time threshold to obtain the second current, the control circuit is specifically used for: When the first voltage is less than the second voltage threshold, the second preset duration is used as the preset time threshold, and the second voltage threshold is less than the first voltage threshold; Detecting a second duration during which the first voltage is less than the second voltage threshold; When the second duration is longer than the second preset duration, the current value of the dynamic current source is adjusted to obtain a second current.

[0038] The second voltage threshold and the second preset duration can both be preset or set by system default. The second voltage threshold is lower than the first voltage threshold. The first preset duration and the second preset duration can be the same or different.

[0039] In specific implementation, when the first voltage is less than the second voltage threshold, the second preset duration is used as the preset time threshold. The second duration during which the first voltage is less than the second voltage threshold is detected. When the second duration is greater than the second preset duration, it indicates that the product has been working in a low-temperature state for a long time. The current value of the dynamic current source can then be adjusted to obtain the second current. In this way, the purpose of accurate temperature detection can be achieved, which can improve the performance of the product and ensure the working efficiency of the product.

[0040] Furthermore, such as Figure 3 As shown, it can include not only Figure 2 The temperature detection circuit shown can also include other peripheral circuits. For example, the temperature detection circuit can be connected to a load and powered via a DC-DC / AC-DC module. In specific implementation, the external temperature is accurately acquired by the voltage formed by the dynamic current source and R1. After accurately acquiring the external temperature, if protection is triggered (low temperature, medium-low temperature, medium-high temperature, high temperature), the power (DC-DC / AD-DC) is adjusted through the system's logic controller (control circuit). After power adjustment, the loss decreases, and the temperature naturally decreases, thereby indirectly regulating and controlling the product's temperature. Of course, other devices that require accurate temperature detection can also use the above-described temperature detection circuit.

[0041] For example, when the output current of the dynamic current source is I... H At this time, when the ambient temperature continues to decrease, causing the thermistor R1 to continuously increase, if the voltage V detected at the pin... adc =I H Multiply by R1, which is higher than V adc2 Continuous T debounce After a certain time, the output current of the dynamic current source is adjusted to I. L ,like Figure 4 The dashed arrow in the image indicates that the output current of the dynamic current source is I. L At this time, when the ambient temperature continues to rise, causing the thermistor R1 to continuously decrease, if the voltage V at the pin is detected... adc =I L Multiplying by R2 is less than V adc1 Continuous T debounce After a certain time, the output current of the dynamic current source is adjusted to I. H ,like Figure 4 The solid line arrow.

[0042] In this embodiment, the control circuit enables different system logic to operate on different ADC values. It can accurately identify a wide temperature range, including high temperature, medium-high temperature, normal temperature, medium-low temperature, and low temperature, and realize different logic control, multi-level control of the power of the application product, and more reliably control the temperature change of the application product.

[0043] In this embodiment, the output current of multiple dynamic current sources can be switched to generate a voltage with an external thermistor. When the product is at a high temperature, the thermistor resistance is low. In this case, switching to a high-current source output can generate a higher voltage, which is beneficial for ADC data acquisition. When the product is at a low temperature, the thermistor resistance is high. In this case, switching to a low-current source output can generate a suitable voltage, avoiding exceeding the ADC range. This embodiment can realize a wide-temperature-range, high-precision temperature detection circuit, while reducing the design cost of the ADC module.

[0044] Let me give another example, such as Figure 5 As shown, after power-on startup, it can output I. H Then test V adc >V adc2 Is the duration T greater than T? debounce When the ambient temperature continues to decrease, causing the thermistor R1 to continuously increase, if the voltage V detected at the pin... adc =I H Multiply by R1, which is higher than V adc2 Continuous T debounce After a certain time, the output current of the dynamic current source is adjusted to I. L Conversely, if the temperature protection logic is not triggered, then check whether the temperature protection logic is triggered. If it is, perform protection, then check whether the temperature protection logic is restored. If it is, execute the step of checking whether the temperature protection logic is triggered. If not, perform protection.

[0045] When the output current of the dynamic current source is I L At that time, V was detected. adc Less than V adc1 Is the duration T greater than T? debounce When the ambient temperature continues to rise, causing the thermistor R1 to continuously decrease, if the voltage V detected at the pin... adc =I L Multiplying by R2 is less than V adc1 Continuous T debounce After a certain time, the output current of the dynamic current source is adjusted to I. H Conversely, if the temperature protection logic is not triggered, then check whether the temperature protection logic is triggered. If it is, perform protection, then check whether the temperature protection logic is restored. If it is, execute the step of checking whether the temperature protection logic is triggered. If not, perform protection.

[0046] In this embodiment, the current threshold of the current source is dynamically adjusted for different temperature points. The corresponding current is adjusted under different thermistor resistance values ​​to avoid temperature acquisition distortion caused by the exponential change characteristics of the thermistor. This achieves high-precision temperature identification and enables the chip to accurately control the temperature of the application product, preventing overheating, accelerated aging, and other adverse phenomena caused by high temperatures. This protects the reliability of the application product.

[0047] In related technologies, chips determine the current battery temperature by outputting a fixed current through a pin or by using an LDO voltage divider to detect the voltage at the pin. Because the resistance of a thermistor decreases exponentially with increasing temperature, the V value calculated using V=IR is small when the application product temperature is high. This results in poor accuracy of the protection threshold at high temperatures and generally poor detection performance. Therefore, the chip needs to integrate a high-precision ADC to acquire an effective voltage, increasing chip design costs. If the current source current is large, the thermistor current is large when the application product temperature is low, and the voltage obtained from V=IR can easily exceed the ADC range. If thermistors with different B values ​​are selected, it is impossible to effectively achieve temperature protection over a wide temperature range, thus failing to achieve high-precision temperature detection over a wide temperature range. However, in this embodiment, the threshold of the current source is dynamically adjusted for different temperature points to achieve accurate measurement of the application product temperature. This allows the system to accurately and effectively adjust the charging and discharging capacity, preventing the application product temperature from continuously rising.

[0048] As can be seen, the temperature detection circuit described in this application embodiment includes a temperature adjustment module and a thermistor. The temperature adjustment module includes a dynamic current source, a control circuit, and an ADC module. The dynamic current source is connected to the control circuit, the ADC module, and the thermistor. The ADC module is connected to one end of the thermistor and the control circuit, and the other end of the thermistor is grounded. The dynamic current source generates a first current. The ADC module forms a first voltage based on the first current and the resistance value of the thermistor. The control circuit adjusts the current value of the dynamic current source according to the first voltage and a preset time threshold to obtain a second current. The second current controls the thermistor to work. In this way, the voltage of the thermistor can be detected by the ADC module, and the product temperature can be reflected by the voltage. The current of the dynamic current source can be adjusted by the voltage and its corresponding duration to achieve accurate temperature detection and product temperature protection.

[0049] In this embodiment of the application, a chip may also be provided, which includes the temperature detection circuit described above.

[0050] In this embodiment of the application, a charging device may also be provided, which includes the temperature detection circuit described above. The charging device may include any device capable of performing a charging function, and may include at least one of the following: an adapter, a power bank, a charging station, etc., without limitation herein.

[0051] In this application embodiment, a temperature detection system may also be provided, which can be used in the above-mentioned temperature detection circuit, chip or charging device.

[0052] The above are the implementation methods of the embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the embodiments of this application, and these improvements and modifications are also considered to be within the protection scope of this application.

Claims

1. A temperature detection circuit, characterized in that, The temperature detection circuit includes: a temperature regulation circuit and a thermistor; the temperature regulation circuit includes: a dynamic current source, a control circuit, and an ADC circuit, wherein... The dynamic current source is connected to the control circuit, the ADC circuit, and the temperature-sensitive resistor. The ADC circuit is connected to one end of the temperature-sensitive resistor and the control circuit, and the other end of the temperature-sensitive resistor is grounded. The dynamic current source is used to generate the first current; The ADC circuit is used to generate a first voltage based on the first current and the resistance value of the thermistor. The control circuit is used to adjust the current value of the dynamic current source by the first voltage and a preset time threshold to obtain a second current, and to control the temperature-sensitive resistor to work by the second current. Specifically, in the aspect of adjusting the current value of the dynamic current source to obtain a second current by means of the first voltage and a preset time threshold, the control circuit is configured to: when the first voltage is greater than the first voltage threshold, use a first preset duration as the preset time threshold; detect a first duration during which the first voltage is greater than the first voltage threshold; and when the first duration is greater than the first preset duration, adjust the current value of the dynamic current source to obtain a second current.

2. The temperature detection circuit according to claim 1, characterized in that, In generating the first voltage based on the first current and the resistance value of the thermistor, the ADC circuit is specifically used for: Obtain the first current within a preset time period; Obtain the resistance value of the temperature-sensitive resistor during the preset time period, which is either pre-set or a system default. The first current is sampled to obtain multiple current values; The resistance value is sampled to obtain multiple resistance values; Based on the multiple current values ​​and the multiple resistance values, multiple reference voltages are obtained; Determine the target mean square error of the plurality of current values; The first voltage is determined based on the target mean square error and the plurality of reference voltages.

3. The temperature detection circuit according to claim 2, characterized in that, In determining the first voltage based on the target mean square error and the plurality of reference voltages, the ADC circuit is specifically configured to: Determine the target adjustment parameters based on the target mean square error; The average voltage is determined based on the plurality of reference voltages; The average voltage is adjusted according to the target adjustment parameter to obtain the first voltage.

4. The temperature detection circuit according to any one of claims 1 to 3, characterized in that, In adjusting the current value of the dynamic current source to obtain the second current, the control circuit is specifically used for: Obtain the first preset current value; The dynamic current source is controlled to operate at the first preset current value to obtain the second current.

5. The temperature detection circuit according to any one of claims 1 to 3, characterized in that, In adjusting the current value of the dynamic current source to obtain the second current, the control circuit is specifically used for: Obtain the reference current value; Obtain the target ambient temperature; Determine the target influencing factor corresponding to the target ambient temperature; A second preset current value is determined based on the target influence factor and the reference current value; The dynamic current source is controlled to operate at the second preset current value to obtain the second current.

6. The temperature detection circuit according to any one of claims 1 to 3, characterized in that, In terms of adjusting the current value of the dynamic current source by the first voltage and a preset time threshold to obtain the second current, the control circuit is specifically used for: When the first voltage is less than the second voltage threshold, the second preset duration is used as the preset time threshold, and the second voltage threshold is less than the first voltage threshold; Detecting a second duration during which the first voltage is less than the second voltage threshold; When the second duration is longer than the second preset duration, the current value of the dynamic current source is adjusted to obtain a second current.

7. A temperature detection circuit, characterized in that, The temperature detection circuit includes: a temperature regulation circuit and a thermistor; the temperature regulation circuit includes: a dynamic current source, a control circuit, and an ADC circuit, wherein... The dynamic current source is connected to the control circuit, the ADC circuit, and the temperature-sensitive resistor. The ADC circuit is connected to one end of the temperature-sensitive resistor and the control circuit, and the other end of the temperature-sensitive resistor is grounded. The dynamic current source is used to generate the first current; The ADC circuit is used to generate a first voltage based on the first current and the resistance value of the thermistor. The control circuit is used to adjust the current value of the dynamic current source by the first voltage and a preset time threshold to obtain a second current, and to control the temperature-sensitive resistor to work by the second current. Specifically, in the aspect of adjusting the current value of the dynamic current source to obtain a second current by means of the first voltage and a preset time threshold, the control circuit is configured to: determine the target voltage level corresponding to the first voltage; determine the preset time threshold corresponding to the target voltage level; and adjust the current value of the dynamic current source according to the first voltage and the preset time threshold to obtain a second current.

8. The temperature detection circuit according to claim 7, characterized in that, In generating the first voltage based on the first current and the resistance value of the thermistor, the ADC circuit is specifically used for: Obtain the first current within a preset time period; Obtain the resistance value of the temperature-sensitive resistor during the preset time period; the preset time period is either pre-set or a system default. The first current is sampled to obtain multiple current values; The resistance value is sampled to obtain multiple resistance values; Based on the multiple current values ​​and the multiple resistance values, multiple reference voltages are obtained; Determine the target mean square error of the plurality of current values; The first voltage is determined based on the target mean square error and the plurality of reference voltages.

9. The temperature detection circuit according to claim 8, characterized in that, In determining the first voltage based on the target mean square error and the plurality of reference voltages, the ADC circuit is specifically configured to: Determine the target adjustment parameters based on the target mean square error; The average voltage is determined based on the plurality of reference voltages; The average voltage is adjusted according to the target adjustment parameter to obtain the first voltage.

10. A temperature detection circuit, characterized in that, The temperature detection circuit includes: a temperature regulation circuit and a thermistor; the temperature regulation circuit includes: a dynamic current source, a control circuit, and an ADC circuit, wherein... The dynamic current source is connected to the control circuit, the ADC circuit, and the temperature-sensitive resistor. The ADC circuit is connected to one end of the temperature-sensitive resistor and the control circuit, and the other end of the temperature-sensitive resistor is grounded. The dynamic current source is used to generate the first current; The ADC circuit is used to generate a first voltage based on the first current and the resistance value of the thermistor. The control circuit is used to adjust the current value of the dynamic current source to obtain a second current by means of the first voltage and a preset time threshold, and to control the operation of the temperature-sensitive resistor by means of the second current, wherein the preset time period is preset or system default. Specifically, in the aspect of forming a first voltage based on the first current and the resistance value of the thermistor, the ADC circuit is configured to: acquire the first current over a preset time period; acquire the resistance value of the thermistor over the preset time period; sample the first current to obtain multiple current values; sample the resistance value to obtain multiple resistance values; obtain multiple reference voltages based on the multiple current values ​​and the multiple resistance values; determine a target mean square error of the multiple current values; and determine the first voltage based on the target mean square error and the multiple reference voltages. Specifically, in determining the first voltage based on the target mean square error and the plurality of reference voltages, the ADC circuit is configured to: determine a target adjustment parameter based on the target mean square error; determine a voltage average based on the plurality of reference voltages; and adjust the voltage average based on the target adjustment parameter to obtain the first voltage.

11. A chip, characterized in that, The chip includes a temperature detection circuit as described in any one of claims 1-10.

12. A charging device, characterized in that, The charging device includes a temperature detection circuit as described in any one of claims 1-10.

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