Temperature detection circuit and energy storage system

Abstract

The utility model relates to the technical field of energy storage power supply mainly provides temperature detection circuit and energy storage system, and this circuit includes first conversion module, the triangular wave generation module and detection module connected with first conversion module, detection module still is connected with the equipment to be measured, first conversion module still is connected with the controller, the triangular wave generation module still is used for with first power connection. Triangular wave generation module is used for receiving the first voltage of first power, and generates triangular wave signal based on first voltage, detection module is in response to the temperature of equipment to be measured, to based on temperature output corresponding voltage signal, first conversion module is used for receiving triangular wave signal and voltage signal, and based on triangular wave signal and voltage signal output first pulse signal, thereby converting the temperature of equipment to be measured from analog signal to digital signal, and the digital signal after conversion is input to the ordinary IO mouth of controller, thereby making controller accurately acquire the temperature of equipment to be measured while, the utilization rate of resources is improved.

Description

Technical Field This utility model relates to the technical field of energy storage power supply, and in particular to a temperature detection circuit and energy storage system. Background Technology With the continuous development of the energy storage inverter industry, performance optimization and reliability assurance in all aspects of the product have become the core focus of industry technology research and development, among which heat treatment is one of the key aspects. Precise temperature monitoring and control can not only avoid device damage caused by abnormal temperatures, but also ensure that the energy storage system is in a state of high efficiency for a long time, which is directly related to user safety and product lifespan. In the design architecture of digital power supplies, to achieve precise control and real-time monitoring of the power supply's operating status, it is necessary to sample core electrical parameters such as voltage and current. These sampling tasks mainly rely on the controller's analog-to-digital conversion interface (ADC I / O). However, due to the limitations of the MCU's own hardware resource configuration, the number of its ADC I / O ports usually has a fixed upper limit, while the configuration of ordinary I / O ports (non-ADC functions) is relatively large. This results in a situation where no usable ADC I / O is available during temperature detection, while ordinary I / O port resources are idle, leading to a serious waste of resources. On the other hand, if temperature is not sampled, it will increase the risk of product failure due to overheating and reduce the reliability of the energy storage inverter power supply. Utility Model Content This utility model provides a temperature detection circuit and an energy storage system, aiming to solve the technical problem of wasted MCU resources and inaccurate temperature detection in existing energy storage systems.

[0001] To solve the above-mentioned technical problems, one technical solution adopted by the present invention is to provide a temperature detection circuit, which includes a triangular wave generation module, a detection module and a first conversion module; The first conversion module is connected to the triangular wave generating module and the detection module respectively. The detection module is also used to connect to the device under test. The first conversion module is also connected to the controller. The triangular wave generating module is also used to connect to the first power supply. The triangular wave generating module is used to receive the first voltage of the first power supply and generate a triangular wave signal based on the first voltage. The detection module responds to the temperature of the device under test and outputs a corresponding voltage signal to the first conversion module based on the temperature; The first conversion module is used to receive the triangular wave signal and the voltage signal, and output a first pulse signal to the controller based on the triangular wave signal and the voltage signal, so that the controller determines the temperature of the device under test based on the duty cycle of the first pulse signal.

[0002] Optionally, the first conversion module is further configured to output a high-level signal when the voltage signal is greater than the triangular wave signal; and When the voltage signal is less than the triangular wave signal, a low-level signal is output.

[0003] Optionally, the first conversion module is a comparator U1B; The first input terminal of the comparator U1B is connected to the detection module, the second input terminal of the comparator U1B is connected to the triangular wave generation module, and the output terminal of the comparator U1B is connected to the controller.

[0004] Optionally, the detection module includes a thermistor RT1, a resistor R5, a resistor R6, and a resistor R12; The resistor R12 is connected to the first input terminal of the comparator U1B and the resistor R5 respectively. The resistor R12 is also grounded through the thermistor RT1. The resistor R5 is also connected to the first power supply. The thermistor RT1 is also connected to the device under test. The resistor R6 is connected in parallel with the thermistor RT1.

[0005] Optionally, the triangular wave generation module includes a triangular wave generation unit and an energy storage unit; The triangular wave generating unit is connected to the energy storage unit, the energy storage unit is connected to the first conversion module, and the triangular wave generating unit is also used to connect to the first power source. The triangular wave generation unit is used to receive the first voltage, control the charging and discharging of the energy storage unit based on the first voltage, and output a triangular wave signal to the first conversion module during the charging and discharging process of the energy storage unit.

[0006] Optionally, the triangular wave generation unit includes resistors R1, R2, R3, R4 and comparator U1A; The first input terminal of the comparator U1A is connected to the first power supply through the resistor R1. The first input terminal of the comparator U1A is grounded through the resistor R4. The first input terminal of the comparator U1A is also connected to the output terminal of the comparator U1A through the resistor R3. The output terminal of the comparator U1A is connected to the first power supply through the resistor R2. The output terminal of the comparator U1A is also connected to the energy storage unit. The second input terminal of the comparator U1A is connected to the energy storage unit. Optionally, the energy storage unit includes a capacitor C1 and a resistor R10; The first end of capacitor C1 is connected to the output end of comparator U1A through resistor R10. The first end of capacitor C1 is also connected to the second input end of comparator U1A. The second end of capacitor C1 is used for grounding.

[0007] Optionally, the temperature detection circuit further includes a second conversion module; The second conversion module is connected to the first conversion module and the second power supply respectively, and the second conversion module is also used to connect to the controller; The second conversion module is used to receive the first pulse signal output by the first conversion module, and periodically turn on and off based on the duty cycle of the first pulse signal, thereby outputting a second pulse signal to the controller.

[0008] Optionally, the second conversion module includes a switch Q1, resistors R7, R8, R9, and R13; The control terminal of the switch Q1 is connected to the first conversion module through the resistor R7. The control terminal of the switch Q1 is also connected to the second terminal of the switch Q1 through the resistor R9. The first terminal of the switch Q1 is connected to the second power supply through the resistor R8. The second terminal of the switch Q1 is also connected to the controller through the resistor R13. The second terminal of the switch Q1 is used for grounding.

[0009] To solve the above-mentioned technical problems, another technical solution adopted in this utility model embodiment is: to provide an energy storage system, the energy storage system comprising: Controller; Device under test; and The temperature detection circuit described above.

[0010] Unlike related technologies, this utility model provides a temperature detection circuit and energy storage system. The circuit includes a triangular wave generator module, a detection module, and a first conversion module. The first conversion module is connected to both the triangular wave generator module and the detection module. The detection module is also connected to the device under test (DUT). The first conversion module is also connected to a controller, and the triangular wave generator module is connected to a first power supply. The triangular wave generator module receives a first voltage from the first power supply and generates a triangular wave signal based on the first voltage. The detection module responds to the temperature of the DUT by outputting a corresponding voltage signal to the first conversion module based on the temperature. The first conversion module receives the triangular wave signal and the voltage signal, and outputs a first pulse signal based on the triangular wave signal and the voltage signal, thereby converting the temperature of the DUT from an analog signal to a digital signal. The converted digital signal is then input to a general-purpose I / O port of the controller, enabling the controller to accurately obtain the temperature of the DUT while improving resource utilization and thus enhancing the reliability of the energy storage system. Attached Figure Description One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0011] Figure 1 This is a structural block diagram of an energy storage system provided in an embodiment of the present invention; Figure 2 This is a structural block diagram of a temperature detection circuit provided in an embodiment of the present invention; Figure 3 This is a circuit diagram of a temperature detection circuit provided in an embodiment of the present invention. Detailed Implementation To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining this utility model and are not intended to limit this utility model.

[0012] The technical features involved in the various embodiments of this application described below do not conflict with each other and can be combined with each other.

[0013] When an element is described as "connected" to another element, it can be directly connected to the other element, or there may be one or more intervening elements between them.

[0014] The terms "first," "second," etc., used in the specification and claims of this utility model are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, the first object can be one or more.

[0015] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0016] Please see Figure 1 , Figure 1 This is a structural block diagram of an energy storage system provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the energy storage system 100 includes a device under test (DUT) 10, a controller 20, and a temperature detection circuit 30. The temperature detection circuit 30 is connected to both the DUT 10 and the controller 20. The temperature detection circuit 30 is used to detect the temperature of the DUT 10 in real time and convert the temperature into a pulse signal (digital signal), which is then input to a general-purpose I / O port of the controller 20. This allows the controller 20 to determine the temperature of the DUT 10 based on the pulse signal. It should be noted that during the operation of the energy storage system 100, the controller 20 needs to acquire voltage, current, and temperature signals of the energy storage system 100 in real time. Since these signals are analog signals, they need to be input to the analog-to-digital converter (ADC) port of the controller 20 so that the controller 20 can accurately identify the corresponding values. However, due to the large number of analog signals that need to be sampled, and the limited number of ADC ports in the controller 20, the system faces challenges. Therefore, in order to improve the utilization rate of resources, the temperature detection circuit 30 is introduced. The temperature of the device under test 10 is converted into a digital signal by the temperature detection circuit 30 and then input to the ordinary interface of the controller 20. In this way, the resource utilization rate of the energy storage system 100 is improved while accurately obtaining the temperature of the device under test 10.

[0017] In some embodiments, please refer to Figure 2 , Figure 2 This is a structural block diagram of a temperature detection circuit provided in an embodiment of the present invention, as shown below. Figure 2 As shown, the temperature detection circuit 30 includes a triangular wave generation module 31, a detection module 32, and a first conversion module 33; The first conversion module 33 is connected to the triangular wave generating module 31 and the detection module 32 respectively. The detection module 32 is also used to connect to the device under test 10. The first conversion module 33 is also connected to the controller 20. The triangular wave generating module 31 is also used to connect to the first power supply (not shown). The triangular wave generating module 31 is used to receive the first voltage of the first power supply and generate a triangular wave signal based on the first voltage. The detection module 32 responds to the temperature of the device under test and outputs a corresponding voltage signal to the first conversion module 33 based on the temperature; The first conversion module 33 is used to receive the triangular wave signal and the voltage signal, and output a first pulse signal to the controller 20 based on the triangular wave signal and the voltage signal, so that the controller 20 determines the temperature of the device under test 10 based on the duty cycle of the first pulse signal.

[0018] Specifically, during the operation of the energy storage system 100, the detection module 32 monitors the temperature of the device under test 10 in real time, converts the temperature into a voltage signal, and inputs it to the first conversion module 33. Simultaneously, the triangular wave generator module 31 receives the first voltage output from the first power supply and outputs a triangular wave signal to the first conversion module 33 based on the first voltage. When the first conversion module 33 receives the triangular wave signal and the voltage signal, it compares the triangular wave signal with the voltage signal and outputs a first pulse signal to the controller 20 based on the comparison result. Since the first pulse signal is a digital signal, it can be directly input to the general-purpose I / O port of the controller 20. Upon receiving the first pulse signal, the controller 20 can determine the temperature of the device under test 10 based on the duty cycle of the first pulse signal. Therefore, the temperature of the device under test 10 can be accurately obtained while improving resource utilization.

[0019] In yet another embodiment, the first conversion module 33 is further configured to output a high-level signal when the voltage signal is greater than the triangular wave signal; and When the voltage signal is less than the triangular wave signal, a low-level signal is output.

[0020] Specifically, when the first conversion module 33 receives the triangular wave signal and the voltage signal, it compares the two signals. If the voltage signal is greater than the triangular wave signal, a high-level signal is output; otherwise, a low-level signal is output. Based on this, a first pulse signal with a corresponding duty cycle is output to the controller 20 according to the voltage signal and the triangular wave signal. It should be noted that the triangular wave signal is a periodic signal, while the voltage signal changes with the temperature of the device under test (DUT) 10. Therefore, the duty cycle of the first pulse signal also changes with the temperature of the DUT 10. Based on this, after the controller 20 receives the first pulse signal, it can infer the temperature of the DUT 10 based on the duty cycle of the first pulse signal.

[0021] In some embodiments, when determining the duty cycle of the first pulse signal, the controller 20 may determine the duty cycle of the first pulse signal by triggering on the rising edge and interrupting on the falling edge, or by triggering on the falling edge and interrupting on the rising edge. After determining the duty cycle of the first pulse signal, the temperature of the device under test 10 can be determined based on the duty cycle.

[0022] In some embodiments, please refer to Figure 3 , Figure 3 This is a circuit diagram of a temperature detection circuit provided in an embodiment of this utility model, as shown below. Figure 3 As shown, the detection module 32 includes a thermistor RT1, a resistor R5, a resistor R6, and a resistor R12; The resistor R12 is connected to the first input terminal of the comparator U1B and the resistor R5 respectively. The resistor R12 is also grounded through the thermistor RT1. The resistor R5 is also connected to the first power supply. The thermistor RT1 is also connected to the device under test 10. The resistor R6 is connected in parallel with the thermistor RT1.

[0023] Specifically, the thermistor RT1 is connected to the device under test 10, and the resistance of the thermistor RT1 changes with the temperature of the device under test 10. When the thermistor RT1 responds to the temperature of the device under test 10, the thermistor RT1, in parallel with resistor R6, together with resistors R12 and R5, divides the first voltage, and inputs the divided voltage signal to the first conversion module 33. The voltage signal is the voltage division value resulting from the thermistor RT1 and resistor R6 connected in parallel and resistor R12 connected in series.

[0024] In yet another embodiment, such as Figure 2 As shown, the triangular wave generation module 31 includes a triangular wave generation unit 311 and an energy storage unit 312; The triangular wave generating unit 311 is connected to the energy storage unit 312, the energy storage unit 312 is connected to the first conversion module 33, and the triangular wave generating unit 311 is also used to connect to the first power source. The triangular wave generation unit 311 is used to receive the first voltage and control the charging and discharging of the energy storage unit 312 based on the first voltage, and outputs a triangular wave signal to the first conversion module 33 during the charging and discharging process of the energy storage unit 312.

[0025] Specifically, when the temperature detection circuit 30 starts working, the triangular wave generation unit 311 receives the first voltage output by the first power supply and outputs a high-level signal based on the first voltage. After the triangular wave generation unit 311 outputs a high-level signal, the energy storage unit 312 begins charging based on the high-level signal. At this time, the voltage stored in the energy storage unit 312 slowly rises, causing the voltage output to the first conversion module 33 to also slowly rise. When the energy stored in the energy storage unit 312 is greater than the first voltage, the triangular wave generation unit 311 outputs a low-level signal, and the energy storage unit 312 begins discharging. During the discharging process of the energy storage unit 312, the voltage input to the first conversion module 33 slowly decreases. When the energy stored in the energy storage unit 312 falls below the first voltage again, the energy storage unit 312 recharges. Based on this, the energy storage unit 312 cycles through charging and discharging, thereby periodically outputting triangular wave signals to the first conversion module 33.

[0026] In another embodiment, such as Figure 3 As shown, the triangular wave generation unit 311 includes resistors R1, R2, R3, and R4, and a comparator U1A; the energy storage unit 312 includes a capacitor C1 and a resistor R10. The first input terminal of the comparator U1A is connected to the first power supply (VDD) through the resistor R1. The first input terminal of the comparator U1A is grounded through the resistor R4. The first input terminal of the comparator U1A is also connected to the output terminal of the comparator U1A through the resistor R3. The output terminal of the comparator U1A is connected to the first power supply through the resistor R2. The output terminal of the comparator U1A is also connected to the energy storage unit 312. The second input terminal of the comparator U1A is connected to the energy storage unit 312.

[0027] The first end of capacitor C1 is connected to the output end of comparator U1A through resistor R10. The first end of capacitor C1 is also connected to the second input end of comparator U1A. The second end of capacitor C1 is used for grounding.

[0028] Specifically, when the first power supply outputs the first voltage, resistors R1 and R3, connected in parallel, are combined with resistor R4 to divide the voltage. The divided voltage is then input to the first input terminal of comparator U1A. At this time, the voltage at the first input terminal of comparator U1A is greater than the voltage at the second input terminal, and comparator U1A outputs a high-level signal. After comparator U1A outputs a high-level signal, the high-level signal charges capacitor C1 through resistor R10, and the voltage stored in capacitor C1 slowly rises. When the voltage stored in capacitor C1 exceeds the voltage division value across resistor R4, comparator U1A outputs a low-level signal. At this time, capacitor C1 begins to discharge through resistor R10, and simultaneously, resistors R4 and R3, connected in parallel, are combined with resistor R1 to divide the first voltage, and the divided voltage is input to the first input terminal of comparator U1A. During the discharge of capacitor C1, if the energy stored in capacitor C1 is lower than the voltage division value of resistors R4 and R3 connected in parallel, comparator U1A will output a high-level signal again to charge capacitor C1. Based on this, a triangular wave signal can be output to the first conversion module 33 by continuously charging and discharging capacitor C1. It can be understood that the triangular wave signal is generated based on the charging and discharging of capacitor C1. By setting the capacitance of capacitor C1 and the resistance of resistor R10, the charging and discharging rate of capacitor C1 can be controlled, thereby controlling the linear slope of the instantaneous value of the triangular wave signal.

[0029] In some embodiments, such as Figure 3 As shown, the first conversion module 33 is a comparator U1B; The first input terminal of the comparator U1B is connected to the detection module 32, the second input terminal of the comparator U1B is connected to the triangular wave generation module 31, and the output terminal of the comparator U1B is connected to the controller 20.

[0030] Specifically, when the detection module 32 outputs a voltage signal and the triangular wave module 31 outputs a triangular wave signal, the comparator U1B compares the magnitude of the voltage signal and the triangular wave signal. When the voltage signal is greater than the triangular wave signal, it outputs a high-level signal to the controller 20; when the voltage signal is less than the triangular wave signal, it outputs a low-level signal to the controller 20. It should be noted that the instantaneous value of the triangular wave signal changes over time. When the detection module 32 outputs a voltage signal based on the current temperature of the device under test 10, the comparator U1B compares the voltage signal with the instantaneous value of the triangular wave signal at the current moment and outputs a corresponding first pulse signal based on the comparison result. Based on this, by comparing the instantaneous values ​​of the voltage signal and the triangular wave signal at the same moment, and through real-time synchronous amplitude comparison, the voltage value corresponding to the voltage signal is converted into a "time signal" of the pulse signal. Therefore, the temperature of the device under test 10 can be determined by the duty cycle of the first pulse signal.

[0031] In another embodiment, it is known that the first pulse signal is directly input to the controller 20, and the high-level signal of the first pulse signal is determined based on the first power supply, and the operating voltage of the controller 20 is constant. Therefore, to avoid the pulse signal input to the controller 20 carrying excessively high voltage, such as... Figure 2 As shown, the temperature detection circuit also includes a second conversion module 34; The second conversion module 34 is connected to the first conversion module 33 and the second power supply (not shown) respectively, and the second conversion module 34 is also used to connect to the controller 20; The second conversion module 34 is used to receive the first pulse signal output by the first conversion module 33, and periodically turn on and off based on the duty cycle of the first pulse signal, thereby outputting a second pulse signal to the controller 20.

[0032] It should be noted that the second voltage corresponding to the second power supply is lower than the first voltage. When the second conversion module 34 receives the first pulse signal, it will turn on when the first pulse signal is a high-level signal, thereby outputting a low-level signal to the controller 20, and turn off when the first pulse signal is a low-level signal, so as to output a high-level signal to the controller 20 based on the second voltage. Based on this, the controller 20 can determine the temperature of the device under test 10 based on the pulse signal.

[0033] In another embodiment, when the thermistor RT1 is a negative temperature coefficient thermistor, the second conversion module 34 inverts the first pulse signal, so that the controller 20 determines that the temperature of the device under test 10 is rising when the duty cycle of the second pulse signal increases, and determines that the temperature of the device under test 10 is falling when the duty cycle of the second pulse signal decreases. Based on this, the temperature of the device under test 10 can be determined more intuitively according to the duty cycle of the pulse signal.

[0034] In another embodiment, such as Figure 3 As shown, the second conversion module 34 includes a switch Q1, resistors R7, R8, R9, and R13; The control terminal of the switch Q1 is connected to the first conversion module 33 through the resistor R7. The control terminal of the switch Q1 is also connected to the second terminal of the switch Q1 through the resistor R9. The first terminal of the switch Q1 is connected to the second power supply (VCC) through the resistor R8. The second terminal of the switch Q1 is also connected to the controller 20 through the resistor R13. The second terminal of the switch Q1 is used for grounding.

[0035] Specifically, the switch Q1 receives the first pulse signal through the resistor R7. When the first pulse signal is high, the switch Q1 is turned on, and the resistor R13 is grounded through the switch Q1, thereby outputting a low-level signal to the controller 20. Conversely, when the first pulse signal is low, the switch Q1 is turned off, and the second voltage is input to the controller 20 through the resistors R8 and R13, causing the controller 20 to receive a high-level signal. Based on this, the controller 20 can periodically receive the second pulse signal and determine the temperature of the device under test 10 based on the duty cycle of the second pulse signal.

[0036] In another embodiment, the number of the detection module 32, the first conversion module 33, and the second conversion module 34 is determined based on the number of devices under test 10. As the number of devices under test 10 increases, the number of the detection module 32, the first conversion module 33, and the second conversion module 34 also increases accordingly. The second pulse signals of the multiple second conversion modules 34 are all input to the general-purpose I / O ports of the controller 20. Based on this, the resource utilization rate can be improved while simultaneously testing the temperature of multiple devices under test 10.

[0037] This utility model provides a temperature detection circuit, which includes a triangular wave generating module, a detection module, and a first conversion module. The first conversion module is connected to both the triangular wave generating module and the detection module. The detection module is also connected to a device under test (DUT). The first conversion module is also connected to a controller. The triangular wave generating module is also connected to a first power supply. The triangular wave generating module receives a first voltage from the first power supply and generates a triangular wave signal based on the first voltage. The detection module responds to the temperature of the DUT by outputting a corresponding voltage signal to the first conversion module based on the temperature. The first conversion module receives the triangular wave signal and the voltage signal, and outputs a first pulse signal based on the triangular wave signal and the voltage signal, thereby converting the temperature of the DUT from an analog signal to a digital signal. The converted digital signal is then input to a general-purpose I / O port of the controller, enabling the controller to accurately obtain the temperature of the DUT while improving resource utilization and thus enhancing the reliability of the energy storage system.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; under the concept of this utility model, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this utility model as described above, which are not provided in detail for the sake of brevity; although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A temperature detection circuit, characterized by comprising: The temperature detection circuit includes a triangular wave generation module, a detection module, and a first conversion module; The first conversion module is connected to the triangular wave generating module and the detection module respectively. The detection module is also used to connect to the device under test. The first conversion module is also connected to the controller. The triangular wave generating module is also used to connect to the first power supply. The triangular wave generating module is used to receive the first voltage of the first power supply and generate a triangular wave signal based on the first voltage. The detection module responds to the temperature of the device under test and outputs a corresponding voltage signal to the first conversion module based on the temperature; The first conversion module is used to receive the triangular wave signal and the voltage signal, and output a first pulse signal to the controller based on the triangular wave signal and the voltage signal, so that the controller determines the temperature of the device under test based on the duty cycle of the first pulse signal.

2. The temperature detection circuit according to claim 1, characterized by, The first conversion module is further configured to output a high-level signal when the voltage signal is greater than the triangular wave signal; and When the voltage signal is less than the triangular wave signal, a low-level signal is output.

3. The temperature detection circuit according to claim 2, wherein The first conversion module is a comparator U1B; The first input terminal of the comparator U1B is connected to the detection module, the second input terminal of the comparator U1B is connected to the triangular wave generating module, and the output terminal of the comparator U1B is connected to the controller.

4. The temperature detection circuit according to claim 3, wherein The detection module includes a thermistor RT1, a resistor R5, a resistor R6, and a resistor R12; The resistor R12 is connected to the first input terminal of the comparator U1B and the resistor R5 respectively. The resistor R12 is also grounded through the thermistor RT1. The resistor R5 is also connected to the first power supply. The thermistor RT1 is also connected to the device under test. The resistor R6 is connected in parallel with the thermistor RT1.

5. The temperature detection circuit according to any one of claims 1 to 4, wherein The triangular wave generating module includes a triangular wave generating unit and an energy storage unit; The triangular wave generating unit is connected to the energy storage unit, the energy storage unit is connected to the first conversion module, and the triangular wave generating unit is also used to connect to the first power source. The triangular wave generation unit is used to receive the first voltage, control the charging and discharging of the energy storage unit based on the first voltage, and output a triangular wave signal to the first conversion module during the charging and discharging process of the energy storage unit.

6. The temperature detection circuit according to claim 5, wherein The triangular wave generation unit includes resistors R1, R2, R3, and R4, and comparator U1A; The first input terminal of the comparator U1A is connected to the first power supply through the resistor R1. The first input terminal of the comparator U1A is grounded through the resistor R4. The first input terminal of the comparator U1A is also connected to the output terminal of the comparator U1A through the resistor R3. The output terminal of the comparator U1A is connected to the first power supply through the resistor R2. The output terminal of the comparator U1A is also connected to the energy storage unit. The second input terminal of the comparator U1A is connected to the energy storage unit.

7. The temperature detection circuit according to claim 6, wherein The energy storage unit includes a capacitor C1 and a resistor R10; The first end of capacitor C1 is connected to the output end of comparator U1A through resistor R10. The first end of capacitor C1 is also connected to the second input end of comparator U1A. The second end of capacitor C1 is used for grounding.

8. The temperature detection circuit according to any one of claims 1 to 4, characterized by, The temperature detection circuit also includes a second conversion module; The second conversion module is connected to the first conversion module and the second power supply respectively, and the second conversion module is also used to connect to the controller; The second conversion module is used to receive the first pulse signal output by the first conversion module, and periodically turn on and off based on the duty cycle of the first pulse signal, thereby outputting a second pulse signal to the controller.

9. The temperature detection circuit according to claim 8, wherein The second conversion module includes a switch Q1, resistors R7, R8, R9, and R13; The control terminal of the switch Q1 is connected to the first conversion module through the resistor R7. The control terminal of the switch Q1 is also connected to the second terminal of the switch Q1 through the resistor R9. The first terminal of the switch Q1 is connected to the second power supply through the resistor R8. The second terminal of the switch Q1 is also connected to the controller through the resistor R13. The second terminal of the switch Q1 is used for grounding.

10. An energy storage system characterized by, The energy storage system includes: Controller; Device under test; and The temperature detection circuit as described in any one of claims 1-9.

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