Fusing control circuit based on temperature triggering

Abstract

The invention relates to the technical field of fuses, and discloses a fusing control circuit based on temperature triggering, which can remarkably improve the safety and reliability of circuit protection. Firstly, the temperature signal acquisition circuit can accurately acquire a temperature signal of a copper bar and convert the temperature signal into a voltage value, and the voltage value is compared with a reference voltage provided by the reference voltage acquisition circuit, so that high-precision monitoring of temperature change is realized, weak fault characteristic temperature change can be captured in time, and a fuse can quickly respond at the initial stage of a fault; and the risk of fault expansion is effectively reduced. And secondly, the circuit design has good anti-interference capability, can stably work in a complex electromagnetic environment, avoids the situation of false triggering or delayed response, and ensures the normal operation of the circuit and the timely processing of faults. Furthermore, the response logic is flexible, a fault circuit can be cut off through high-speed action, mistaken damage to a normal circuit can be avoided, and the protection requirement of a modern complex electronic system is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fuses, in particular to a temperature-triggered fuse control circuit. BACKGROUND

[0002] As a core key component in the circuit protection system, the fuse plays an irreplaceable important role in ensuring the safe and stable operation of the circuit, and its application range is extremely wide, covering not only traditional high and low voltage power distribution systems, various control devices, but also in-depth application in the booming new energy field. Especially in the current rapid rise of the new energy vehicle industry, in the large-capacity power supply scenarios such as battery packs of new energy vehicles, the importance of fuses is increasingly prominent. Because of the large current and high energy in these scenarios, once a short circuit fault or a temperature that is too high occurs, it is extremely likely to cause serious accidents such as battery explosion and circuit fire, causing great loss to personnel life safety and property.

[0003] However, the current fuse control technology has exposed many significant and urgent defects in practical application. First, in terms of temperature signal monitoring, the existing technology has a serious lack of monitoring accuracy. Temperature signal is often one of the important characteristics reflecting circuit abnormalities, but the existing technology is difficult to capture the weak fault characteristic temperature changes in real time and accurately, which leads to the inability to take effective measures in the early stage of failure, thereby increasing the risk of failure expansion. Second, the anti-interference ability is extremely weak. In modern electronic systems, electromagnetic fields are ubiquitous, and the existing fuse control technology lacks effective anti-interference mechanism when facing electromagnetic field disturbance, and is prone to false triggering or delayed response. False triggering will cause unnecessary interruption of the circuit, affecting the normal operation of the system; delayed response may fail to handle the fault in time, and thus cause more serious consequences. Third, the response logic is too rigid. Modern electronic systems have dual requirements for fuse control technology, which not only needs to be able to act quickly to quickly cut off the faulty circuit, but also needs to ensure safety protection to avoid damage to the normal circuit. However, the response logic of the existing technology cannot meet the requirements of both aspects, making it difficult to meet the protection needs of modern complex electronic systems. The traditional scheme mainly relies on simple voltage comparison or mechanical fuse mechanism. This single and backward way will have a sharp decline in performance when facing complex electromagnetic environment or transient impact, and cannot guarantee the safe and reliable operation of the circuit.

[0004] Therefore, in order to effectively improve the safety and reliability of circuit protection and meet the growing protection needs of modern high-reliability electronic systems, it is urgent to develop a new type of fuse control technology with high-precision sensing ability and intelligent response ability.

[0005] The above information is presented as background information only to assist with an understanding of the present disclosure. No determination or admission is made as to any subject matter being prior art with respect to the present disclosure. SUMMARY

[0006] The present application provides a temperature trigger-based fuse control circuit to solve the problems in the prior art.

[0007] To achieve the above object, the present application provides the following technical solutions:

[0008] A temperature trigger-based fuse control circuit, comprising a reference voltage acquisition circuit, a temperature signal acquisition circuit, a comparison circuit and a constant current trigger circuit; wherein,

[0009] The reference voltage acquisition circuit, the temperature signal acquisition circuit and the constant current trigger circuit are connected to the comparison circuit respectively;

[0010] The reference voltage acquisition circuit is configured to provide a reference voltage value;

[0011] The temperature signal acquisition circuit is configured to acquire a temperature signal of a copper bar and convert the temperature signal into an acquisition voltage value;

[0012] The comparison circuit is configured to compare the reference voltage value with the acquisition voltage value and output a signal to the constant current trigger circuit when the acquisition voltage value is greater than the reference voltage value;

[0013] The constant current trigger circuit is configured to output a constant current to drive the fuse to act when receiving the signal output by the comparison circuit.

[0014] Further, in the temperature trigger-based fuse control circuit, the reference voltage acquisition circuit comprises a third interface JP3, a linear voltage regulator Q2 and a sliding resistor R12;

[0015] An input pin of the third interface JP3 is connected to an external DC power supply, and a first output pin of the third interface JP3 is connected to GND;

[0016] A VIN pin of the linear voltage regulator Q2 is connected to a second output pin of the third interface JP3, and a VOUT pin of the linear voltage regulator Q2 is connected to the temperature signal acquisition circuit and the sliding resistor R12 respectively;

[0017] The sliding resistor R12 is connected to the comparison circuit.

[0018] Further, in the temperature trigger-based fuse control circuit, the reference voltage acquisition circuit further comprises a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8 and a ninth capacitor C9;

[0019] One end of the sixth capacitor C6 is connected with the slider of the slide rheostat R12, and the other end is connected with the resistance coil of the slide rheostat R12;

[0020] One end of the seventh capacitor C7 is connected between the third interface JP3 and the VIN pin of the linear voltage regulator Q2, and the other end is connected to GND;

[0021] One end of the eighth capacitor C8 and the ninth capacitor C9 is connected to the VOUT pin of the linear voltage regulator Q2, and the other end is connected to GND.

[0022] Further, in the temperature-triggered fuse control circuit, the temperature signal acquisition circuit comprises a temperature sensor RT1, a first resistor R1, and a voltage follower U1 composed of an operational amplifier;

[0023] The temperature sensor RT1 is arranged on the copper bar and connected with the non-inverting input terminal of the voltage follower U1;

[0024] One end of the first resistor R1 is connected with the non-inverting input terminal of the voltage follower U1, and the other end is connected with the VOUT pin of the linear voltage regulator Q2;

[0025] The output terminal of the voltage follower U1 is connected with the comparison circuit, and the inverting input terminal of the voltage follower U1 is connected with the output terminal of the voltage follower U1.

[0026] Further, in the temperature-triggered fuse control circuit, the temperature signal acquisition circuit further comprises a second interface JP2, a fourth capacitor C4, and a second capacitor C2;

[0027] The input pin of the second interface JP2 is connected with the temperature sensor RT1, the second output pin of the second interface JP2 is connected with the non-inverting input terminal of the voltage follower U1, and the first output pin of the second interface JP2 is connected to GND;

[0028] One end of the fourth capacitor C4 is connected with the non-inverting input terminal of the voltage follower U1, and the other end is connected to GND;

[0029] The power supply pin of the voltage follower U1 is connected with the VOUT pin of the linear voltage regulator Q2, and the ground pin of the voltage follower U1 is connected to GND;

[0030] One end of the second capacitor C2 is connected with the power supply pin of the voltage follower U1, and the other end is connected to GND.

[0031] Further, in the temperature-triggered fuse control circuit, the comparison circuit comprises a voltage comparator U2, a second resistor R2, a seventh resistor R7 and a voltage stabilizing tube ZD1.

[0032] The inverting input end of the voltage comparator U2 is connected with the VOUT pin of the linear voltage stabilizer Q2, the noninverting input end of the voltage comparator U2 is connected with the output end of the voltage follower U1, and the output end of the voltage comparator U2 is connected with the constant current trigger circuit.

[0033] The negative electrode of the voltage stabilizing tube ZD1 is connected with the output end of the voltage comparator U2, and the positive electrode of the voltage stabilizing tube ZD1 is connected with GND.

[0034] One end of the second resistor R2 is connected with the VOUT pin of the linear voltage stabilizer Q2, and the other end is connected with the output end of the voltage comparator U2.

[0035] One end of the seventh resistor R7 is connected with the output end of the voltage comparator U2, and the other end is connected with GND.

[0036] Further, in the temperature-triggered fuse control circuit, the comparison circuit further comprises a third capacitor C3, a fifth capacitor C5, a fifth resistor R5, a sixth resistor R6 and a ninth resistor R9.

[0037] The power supply pin of the voltage comparator U2 is connected with the VOUT pin of the linear voltage stabilizer Q2, and the ground pin of the voltage comparator U2 is connected with GND.

[0038] One end of the third capacitor C3 is connected with the power supply pin of the voltage comparator U2, and the other end is connected with GND.

[0039] One end of the fifth capacitor C5 is connected with the output end of the voltage comparator U2, and the other end is connected with GND.

[0040] The sixth resistor R6 is connected in series with the output end of the voltage comparator U2.

[0041] One end of the ninth resistor R9 is connected between one end of the sixth resistor R6 and the constant current trigger circuit, and the other end is connected with GND.

[0042] The fifth resistor R5 is connected in series between the noninverting input end of the voltage comparator U2 and the output end of the voltage follower U1.

[0043] Further, in the temperature-triggered fuse control circuit, the constant current trigger circuit comprises an NMOS tube Q1, an operational amplifier U3 and a sampling resistor R11.

[0044] The source of the NMOS tube Q1 is connected to GND in series with the sampling resistor R11, and the drain of the NMOS tube Q1 is connected with the fuse;

[0045] The non-inverting input end of the operational amplifier U3 is connected with the output end of the voltage comparator U2, the output end of the operational amplifier U3 is connected with the gate of the NMOS tube Q1, and the inverting input end of the operational amplifier U3 is connected between the source of the NMOS tube Q1 and the sampling resistor R11.

[0046] Further, in the temperature-triggered fuse control circuit, the constant-current trigger circuit further comprises a first interface JP1, a tenth resistor R10, a third resistor R3, a fourth resistor R4 and a first capacitor C1.

[0047] The power pin of the operational amplifier U3 is connected with the VOUT pin of the linear voltage stabilizer Q2 in series with the third resistor R3, and the ground pin of the operational amplifier U3 is connected to GND.

[0048] The tenth resistor R10 is connected in series with the inverting input end of the operational amplifier U3.

[0049] The second input pin of the first interface JP1 is connected to the drain of the NMOS tube Q1, the first input pin of the first interface JP1 is connected between the third resistor R3 and the VOUT pin of the linear voltage stabilizer Q2, and the output pin of the first interface JP1 is connected with the fuse.

[0050] One end of the fourth resistor R4 is connected to the first input pin of the first interface JP1, and the other end is connected between the output end of the operational amplifier U3 and the gate of the NMOS tube Q1.

[0051] One end of the first capacitor C1 is connected between the third resistor R3 and the VOUT pin of the linear voltage stabilizer Q2, and the other end is connected to GND.

[0052] Further, in the temperature-triggered fuse control circuit, the reference voltage acquisition circuit, the temperature signal acquisition circuit, the comparison circuit and the constant-current trigger circuit are respectively electrically connected through a PCB copper layer.

[0053] Compared with the prior art, the present application has the following beneficial effects:

[0054] The application provides a temperature trigger-based fuse control circuit, which can effectively overcome many defects of existing fuse control technologies and significantly improve the safety and reliability of circuit protection. First, the temperature signal acquisition circuit can accurately acquire the temperature signal of the copper bar and convert it into a voltage value, which is compared with the reference voltage provided by the reference voltage acquisition circuit, thereby realizing high-precision monitoring of temperature changes and capturing weak fault characteristic temperature changes in time, so that the fuse can quickly respond in the early stage of failure and effectively reduce the risk of failure expansion. Second, the circuit design has good anti-interference ability and can work stably in a complex electromagnetic environment, avoiding false triggering or delayed response, and ensuring the normal operation of the circuit and timely processing of faults. Third, the response logic is flexible, which can quickly actuate to cut off the fault circuit and avoid damaging the normal circuit, meeting the protection needs of modern complex electronic systems and providing a safer and more reliable circuit protection scheme for high-reliability electronic systems such as new energy vehicles.

[0055] The present application has other characteristics and advantages, which will be apparent or will be described in detail in the accompanying drawings and subsequent detailed description incorporated herein, which together serve to explain the specific principles of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0056] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0057] Figure 1 is a circuit principle schematic diagram of a temperature trigger-based fuse control circuit provided by the embodiment of the present application;

[0058] Figure 2 is a circuit principle schematic diagram of a reference voltage acquisition circuit provided by the embodiment of the present application;

[0059] Figure 3 is a circuit principle schematic diagram of a temperature signal acquisition circuit provided by the embodiment of the present application;

[0060] Figure 4 is a circuit principle schematic diagram of a comparison circuit provided by the embodiment of the present application;

[0061] Figure 5 is a circuit principle schematic diagram of a constant-current trigger circuit provided by the embodiment of the present application.

[0062] Reference signs:

[0063] Reference voltage acquisition circuit 1, temperature signal acquisition circuit 2, comparison circuit 3, constant current trigger circuit 4. DETAILED DESCRIPTION

[0064] To make the possible application scenarios, technical principles, specific schemes that can be implemented, purposes and effects achieved, etc. of the present application clear, the following will be described in detail in combination with the specific embodiments listed and the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, but cannot limit the protection scope of the present application.

[0065] In this paper, the term "embodiment" means that the specific features, structures or characteristics described in combination with the embodiment can be included in at least one embodiment of the present application. The term "embodiment" appearing at various places in the specification does not necessarily refer to the same embodiment, and does not particularly limit the independence or association between other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the technical features mentioned in each embodiment can be combined in any way to form a corresponding implementable technical solution.

[0066] Unless otherwise defined, the meaning of the technical terms used herein is the same as that generally understood by those skilled in the art to which the present application belongs; the use of related terms in this paper is only for the purpose of describing specific embodiments, and is not intended to limit the present application.

[0067] In the description of the present application, the phrase "and / or" is a description of the logical relationship between the objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this paper generally represents that the associated objects before and after are a "or" logical relationship.

[0068] In the present application, the terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, primary and secondary or order relationship between the entities or operations.

[0069] In the present application, without more limitation, the "include", "contain", "have" or other similar expressions used in the sentence are intended to cover non-exclusive inclusion, and these expressions do not exclude the existence of other elements in the process, method or product including the described elements, so that the process, method or product including a series of elements can not only include those limited elements, but also include other elements not explicitly listed, or also include the elements inherent to such process, method or product.

[0070] In the present application, the expressions such as "greater than", "less than", "exceed" and the like are understood as not including the number itself; the expressions such as "above", "below", "within" and the like are understood as including the number itself. In addition, in the description of the embodiments of the present application, the meaning of "multiple" is two or more (including two), and similar expressions related to "multiple" are also understood in this way, for example, "multiple groups", "multiple times" and the like, unless otherwise explicitly specified.

[0071] In the description of the embodiments of the present application, the spatially related expressions used, such as "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or the drawings, and are only for the convenience of describing the specific embodiments of the present application or for the reader to understand, and do not indicate or imply that the indicated device or component must have a particular position, a particular orientation, or be constructed or operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0072] Unless otherwise explicitly specified or limited, in the description of the embodiments of the present application, the terms "mount", "connect", "connect", "fix", "set" and the like should be understood broadly. For example, the "connection" can be fixed connection, or detachable connection, or integral setting; it can be mechanical connection, or electrical connection, or communication connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For those skilled in the art to which the present application belongs, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0073] Please refer to Figure 1 The embodiment of the present application provides a temperature trigger-based fuse control circuit, which comprises a reference voltage acquisition circuit 1, a temperature signal acquisition circuit 2, a comparison circuit 3 and a constant current trigger circuit 4; wherein,

[0074] From the connection relationship of each module, the reference voltage acquisition circuit 1, the temperature signal acquisition circuit 2 and the constant current trigger circuit 4 establish stable electrical connection with the comparison circuit 3. This connection mode ensures that efficient and accurate data transmission and interaction between modules can be achieved, laying a solid foundation for the normal operation of the entire fuse control circuit.

[0075] Specifically, the reference voltage acquisition circuit 1 undertakes the important task of providing a reference voltage value. Through careful design of the circuit structure and precise component selection, it can stably output a pre-set, accurate reference voltage value, providing a reliable reference standard for subsequent temperature comparison operations.

[0076] The temperature signal acquisition circuit 2 focuses on the acquisition of the copper bar temperature signal. In practical applications, the copper bar, as a key conductive component in the circuit, its temperature change directly reflects the working state and potential fault information of the circuit. The temperature signal acquisition circuit 2 uses advanced temperature sensor technology and signal processing algorithms to accurately and in real time acquire the temperature signal of the copper bar, and skillfully converts the temperature signal into a corresponding acquisition voltage value. This conversion process not only realizes the digital processing of the temperature signal, but also provides convenience for subsequent comparison with the reference voltage.

[0077] The comparison circuit 3, as the core decision-making module of the entire fuse control circuit, plays a crucial role. It receives the reference voltage value from the reference voltage acquisition circuit 1 and the acquisition voltage value from the temperature signal acquisition circuit 2, and performs detailed and accurate comparison and analysis of the two voltage values. When the comparison circuit 3 judges that the acquisition voltage value is greater than the reference voltage value, it indicates that the temperature of the copper bar has exceeded the pre-set safety threshold, and there may be potential fault risks. At this time, the comparison circuit 3 will quickly output a specific signal to the constant current trigger circuit 4 to trigger the subsequent fuse protection action.

[0078] The constant current trigger circuit 4 will immediately start working after receiving the signal output by the comparison circuit 3. It outputs a constant current through internal circuit design and control strategy. This constant current has the characteristics of stability and reliability, and can provide enough driving energy for the fuse to make it act quickly, thereby cutting off the faulty circuit to prevent further expansion and spread of the fault.

[0079] The fuse control circuit based on temperature triggering proposed in the embodiment of the present application has significant technical advantages and innovative value, and can effectively overcome many defects of existing fuse control technology, bringing a new solution to the field of circuit protection, greatly improving the safety and reliability of circuit protection.

[0080] Firstly, in terms of temperature monitoring, the temperature signal acquisition circuit exhibits excellent performance. It can collect the temperature signal of the copper bar with extremely high precision and accurately convert it into a voltage value. By comparing it with the precise reference voltage provided by the reference voltage acquisition circuit, fine and high-precision monitoring of temperature changes is achieved. This high-precision monitoring capability enables the circuit to capture extremely weak fault characteristic temperature changes in a timely manner, and even slight temperature fluctuations can be detected. Once abnormal temperature changes are detected, the fuse can respond quickly at the early stage of failure and cut off the circuit in time, effectively reducing the risk of failure expansion and providing strong protection for the safe operation of the circuit system.

[0081] Secondly, the circuit design has excellent anti-interference ability. In modern electronic systems, the electromagnetic environment is complex and variable, and various electromagnetic interferences are everywhere. These interferences can have a serious impact on the normal operation of the circuit, causing false triggering or delayed response problems. However, the fuse control circuit of the present application can maintain stable performance in complex electromagnetic environments through reasonable circuit layout, optimized component selection, and advanced anti-interference technology. It can effectively resist the influence of external electromagnetic interference and avoid false actions or delayed responses caused by interference, ensuring that the circuit can operate normally in various harsh environments and that faults can be handled in a timely and accurate manner.

[0082] Furthermore, the response logic of the circuit is flexible and variable, fully meeting the protection needs of modern complex electronic systems. Modern electronic systems have higher requirements for fuse control technology, both in terms of high-speed action when a fault occurs to quickly cut off the faulty circuit to prevent further deterioration of the fault, and in terms of avoiding damage to normal circuits in normal working conditions to ensure stable operation of the system. The fuse control circuit of the present application realizes flexible adjustment of the response logic through careful design of the control strategy and circuit structure. It can intelligently judge and take appropriate action according to different working scenarios and fault conditions, both quickly responding to faults and ensuring the safety of normal circuits, providing a safer and more reliable circuit protection solution for high-reliability electronic systems such as new energy vehicles.

[0083] In summary, the temperature-triggered fuse control circuit of the present application has significant advantages in temperature monitoring precision, anti-interference ability, and response logic flexibility, providing an innovative and efficient solution for circuit protection in modern electronic systems, with broad application prospects and important practical value.

[0084] In a specific and optimized embodiment of the present embodiment, the fuse control circuit innovatively adopts a modular cascade architecture as a whole. This architecture design is highly systematic and forward-looking, which divides the entire fuse control circuit into several independent modules according to functions, each module undertakes specific functional tasks, and at the same time realizes the cooperative work between modules through reasonable cascade mode, thereby building a functional complete and excellent performance circuit system.

[0085] Specifically, the four core modules of the reference voltage acquisition circuit 1, the temperature signal acquisition circuit 2, the comparison circuit 3 and the constant current trigger circuit 4 are electrically connected through the carefully designed copper layer of the PCB (printed circuit board). As an important channel for current transmission in the circuit, the copper layer of the PCB has the advantages of good conductivity, stable and reliable connection, etc. In the present embodiment, through scientific and reasonable layout and planning of the copper layer of the PCB, the electrical connection between the modules is not only simple and efficient, but also has good signal transmission characteristics.

[0086] From the connection mode, the copper layer of the PCB connects the reference voltage acquisition circuit 1, the temperature signal acquisition circuit 2, the comparison circuit 3 and the constant current trigger circuit 4 with each other according to the pin distribution and signal flow direction of each module with the optimal path. This connection mode not only reduces the interference and loss in the signal transmission process, improves the integrity and accuracy of the signal, but also makes the structure of the entire circuit more compact and the layout more reasonable, which is beneficial to the miniaturization design and integrated application of the circuit.

[0087] Under the joint action of the modular cascade architecture and the copper layer connection of the PCB, the fuse control circuit exhibits many significant advantages. On the one hand, the modular design enables each module to be designed, debugged and maintained independently, greatly improving the development efficiency and maintainability of the circuit. When a module fails or needs to be upgraded, only the module needs to be handled individually, without affecting the normal work of other modules, thereby reducing the maintenance cost and upgrading difficulty. On the other hand, the electrical connection realized by the copper layer of the PCB ensures the stability and reliability of signal transmission between modules, effectively avoids circuit failure caused by poor connection or signal interference, and further improves the performance and stability of the entire fuse control circuit.

[0088] In addition, this modular cascade architecture and the way of connecting the copper layer of the PCB also provide convenience for the expansion and upgrade of the circuit. With the continuous development of electronic technology and the continuous change of application requirements, it may be necessary to expand the function or improve the performance of the fuse control circuit. In this case, only by adding corresponding modules or optimizing and improving the existing modules on the basis of the existing architecture and connecting and integrating through the copper layer of the PCB, the upgrade and expansion of the circuit can be realized without redesigning the entire circuit, thereby greatly shortening the development cycle and reducing the development cost.

[0089] Please refer to Figure 2 In an embodiment of the present embodiment, the reference voltage acquisition circuit 1 adopts a carefully designed circuit structure, and the core components thereof include a third interface JP3, a linear voltage regulator Q2, and a sliding resistor R12. Among them,

[0090] The third interface JP3 serves as the connection hub of the entire reference voltage acquisition circuit 1 and the external power supply, and undertakes the key task of introducing the external DC power supply. The input pin thereof is stably connected with the external DC power supply (5V), ensuring stable power input. At the same time, the first output pin of the third interface JP3 is ingeniously connected to GND (ground), thereby building a stable reference potential for the circuit and laying a foundation for the normal work of the subsequent circuit.

[0091] The linear voltage regulator Q2 (selected from the LM1117-3.3V type) plays a crucial role in the circuit, which is responsible for the voltage stabilization of the input 5V DC power supply. Specifically, the VIN pin of the linear voltage regulator Q2 is closely connected with the second output pin of the third interface JP3, thereby obtaining the 5V DC power supply without voltage stabilization. After the precise voltage stabilization circuit inside the linear voltage regulator Q2 processes, a stable 3.3V voltage is output from the VOUT pin thereof. This stable 3.3V voltage has extremely important significance, which directly provides working power for the temperature signal acquisition circuit 2, ensuring that the temperature signal acquisition circuit 2 can accurately and stably acquire the temperature signal of the copper bar; the other way is to provide a basic voltage for the subsequent voltage division network, which guarantees the generation of adjustable reference voltage.

[0092] The sliding resistor R12 (10kΩ precision adjustable resistor is selected) is the key element in the reference voltage acquisition circuit 1 to realize the adjustable reference voltage. It is connected with the VOUT pin of the linear voltage regulator Q2, together forming a voltage divider network. Through this voltage divider network, the stable 3.3V voltage is converted into a continuously adjustable reference voltage Vref of 0-3.3V. In actual operation, only by adjusting the slide position of the sliding resistor R12, the resistance ratio in the voltage divider network can be changed, and then the accurate adjustment of the size of the reference voltage Vref is realized. This adjustable reference voltage design has great flexibility, which can easily set the corresponding temperature threshold according to different application scenarios and actual needs. When the converted voltage value of the temperature signal collected by the temperature signal acquisition circuit 2 exceeds the set reference voltage Vref, the comparison circuit 3 will trigger the subsequent fuse protection action, thereby realizing effective protection of the circuit.

[0093] The sliding resistor R12 not only plays an important role inside the reference voltage acquisition circuit 1, but also is closely connected with the comparison circuit 3 through a specific electrical connection. It accurately transmits the adjustable reference voltage Vref generated to the comparison circuit 3, providing a key reference for the comparison circuit 3 to compare voltages. The comparison circuit 3 compares the reference voltage Vref with the collected voltage value output by the temperature signal acquisition circuit 2, thereby judging whether the circuit has a risk of failure and deciding whether to trigger the fuse action.

[0094] In order to further optimize the performance of the reference voltage acquisition circuit 1 and improve the stability and anti-interference ability of the circuit, the circuit also carefully configures the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8 and the ninth capacitor C9 and other capacitor elements.

[0095] One end of the sixth capacitor C6 is connected with the slide of the sliding resistor R12, and the other end is connected with the resistance coil of the sliding resistor R12. This connection mode enables the sixth capacitor C6 to play a role in filtering and stabilizing voltage during the adjustment of the reference voltage by the sliding resistor R12, effectively reducing the voltage fluctuation caused by the movement of the slide, and ensuring the stability of the reference voltage Vref.

[0096] One end of the seventh capacitor C7 is connected between the third interface JP3 and the VIN pin of the linear voltage regulator Q2, and the other end is connected to GND. The seventh capacitor C7 mainly plays a role of power filtering here, which can filter out high-frequency noise and interference signals in the input power, providing a more pure input voltage for the linear voltage regulator Q2, thereby improving the voltage stabilizing effect of the linear voltage regulator Q2.

[0097] The eighth capacitor C8 and the ninth capacitor C9 are connected to the VOUT pin of the linear voltage regulator Q2 at one end and to GND at the other end. These two capacitors are used in parallel, further enhancing the filtering effect, effectively removing the residual ripple and noise in the output voltage of the linear voltage regulator Q2, providing a more stable and clean 3.3V power supply for the temperature signal acquisition circuit 2 and the subsequent voltage division network, ensuring the reliable operation of the entire reference voltage acquisition circuit 1.

[0098] In summary, the reference voltage acquisition circuit 1 in this embodiment realizes stable and adjustable reference voltage output through reasonable component selection and careful circuit design, providing a solid foundation for the normal operation of the entire fuse control circuit. At the same time, the synergistic work and optimized configuration of each component effectively improve the stability and anti-interference ability of the circuit, making the reference voltage acquisition circuit 1 able to adapt to complex and variable electronic environments, providing reliable protection for circuit protection.

[0099] Please refer to Figure 3 In one embodiment of this embodiment, the temperature signal acquisition circuit 2 adopts a carefully planned circuit architecture, the core components of which include a temperature sensor RT1, a first resistor R1, and a voltage follower U1 carefully constructed by an operational amplifier. The connection method, function and working principle of each component will be described in detail below.

[0100] As a key component of temperature signal acquisition, the temperature sensor RT1 (optional NTC thermistor, thermocouple, etc. temperature sensing device with high sensitivity and reliability) is precisely set on the copper bar. The copper bar, as an important carrier of current transmission in the circuit, its temperature change directly reflects the working state of the circuit. The temperature sensor RT1 can accurately sense the temperature change of the copper bar in real time and convert it into a corresponding electrical signal. The temperature sensor RT1 is closely connected to the non-inverting input terminal of the voltage follower U1 (selected LMV321 model, this model of operational amplifier has low offset voltage, high input impedance and low output impedance, etc. excellent characteristics, can meet the high precision requirements of temperature signal acquisition), ensuring that the temperature signal collected can be transmitted to the voltage follower U1 without attenuation for subsequent processing.

[0101] The first resistor R1 (selected resistance value of 10kΩ precision resistor) plays an important role in the circuit. One end is connected with the non-inverting input terminal of voltage follower U1, and the other end is connected with the VOUT pin of linear voltage regulator Q2. Linear voltage regulator Q2 provides stable 3.3V working power for the whole temperature signal acquisition circuit 2, and the first resistor R1 and the temperature sensor RT1 together constitute a voltage dividing circuit. Through this voltage dividing circuit, the electrical signal generated by the resistance value change of the temperature sensor RT1 with temperature is converted into a suitable voltage signal, so that the voltage follower U1 can effectively process and transmit.

[0102] The voltage follower U1 is the core processing unit of the temperature signal acquisition circuit 2. Its output is directly connected to the comparison circuit 3, providing the comparison circuit 3 with the processed temperature signal voltage. The inverting input of the voltage follower U1 is ingeniously connected to its output, and this unique connection makes the voltage follower U1 have the characteristics of high input impedance and low output impedance. High input impedance can ensure that the voltage follower U1 hardly draws current from the voltage dividing circuit composed of the temperature sensor RT1 and the first resistor R1 when collecting temperature signals, thereby avoiding signal attenuation and distortion caused by current extraction and ensuring the accuracy of temperature signal acquisition. Low output impedance enables the voltage follower U1 to provide stable driving capability for the subsequent comparison circuit 3, ensuring that the temperature signal can be accurately transmitted to the comparison circuit 3 for further analysis and processing.

[0103] In addition, to further optimize circuit performance and ensure the accuracy and stability of signal acquisition, the circuit also ingeniously incorporates auxiliary elements such as the second interface JP2, the fourth capacitor C4 and the second capacitor C2.

[0104] The second interface JP2, as an important bridge connecting the temperature signal acquisition circuit 2 with external elements, has a clear and key connection method. Its input pin is closely connected with the temperature sensor RT1, ensuring that it can accurately receive the temperature signal collected by the temperature sensor RT1. The second output pin of the second interface JP2 is connected with the non-inverting input terminal of the voltage follower U1, smoothly transmitting the temperature signal to the voltage follower U1. At the same time, the first output pin of the second interface JP2 is connected to GND, providing a stable reference potential for the whole circuit, which helps to improve the accuracy and stability of temperature signal acquisition.

[0105] One end of the fourth capacitor C4 is connected to the non-inverting input terminal of the voltage follower U1, and the other end is connected to GND. In the circuit, the fourth capacitor C4 mainly plays a role in filtering and decoupling. It can effectively filter out high-frequency noise and interference signals in the input signal, prevent these noise and interference signals from affecting the normal operation of the voltage follower U1, so as to ensure that the voltage follower U1 can receive pure and stable temperature signals, and improve the quality of temperature signal acquisition.

[0106] The power supply of the voltage follower U1 is connected to the ground: the power supply pin of the voltage follower U1 is connected to the VOUT pin of the linear voltage regulator Q2 to obtain a stable 3.3V working power supply. Stable power supply is the basis for the normal operation of the voltage follower U1, which can ensure the stable operation of its internal circuit, so as to realize accurate processing of the temperature signal. The ground pin of the voltage follower U1 is connected to GND, which provides a common reference potential for the circuit, ensuring that the output signal of the voltage follower U1 can be transmitted and processed at the correct level.

[0107] One end of the second capacitor C2 is connected to the power supply pin of the voltage follower U1, and the other end is connected to GND. The second capacitor C2 plays a role in power filtering and stabilization in the circuit. It can filter out high-frequency ripple and noise in the power supply to provide a more pure and stable power supply environment for the voltage follower U1, further improving the working stability and reliability of the voltage follower U1, so as to ensure that the entire temperature signal acquisition circuit 2 can operate stably for a long time.

[0108] In the temperature signal acquisition circuit 2 of the present embodiment, the temperature sensor RT1 senses the temperature change of the copper bar in real time and converts it into an electrical signal. The electrical signal is converted into a suitable voltage signal through the voltage division circuit composed of the first resistor R1 and the temperature sensor RT1, and then transmitted to the non-inverting input terminal of the voltage follower U1. The voltage follower U1, with its high input impedance and low output impedance characteristics, buffers and isolates the input voltage signal, ensuring that the signal is not distorted and attenuated during transmission. At the same time, the fourth capacitor C4 and the second capacitor C2 filter the input signal and the power supply respectively, remove noise and interference, and improve signal quality and circuit stability. The temperature signal voltage processed by the voltage follower U1 is transmitted from its output terminal to the comparison circuit 3, providing accurate temperature basis for subsequent circuit protection decisions.

[0109] Please refer to Figure 4In one embodiment of the present embodiment, the comparison circuit 3 adopts a carefully designed circuit architecture, the core components of which include a voltage comparator U2 (selected from the LM393 model, which has the advantages of low power consumption, high precision, fast response speed, etc., and can meet the accuracy and timeliness requirements of the comparison circuit for signal comparison), a second resistor R2, a seventh resistor R7, and a voltage stabilizing tube ZD1. The connection method, function, and working principle of each element will be fully and deeply described below.

[0110] As the core processing unit of the comparison circuit 3, the voltage comparator U2 undertakes the key task of comparing the input signal and outputting the corresponding result. Its inverting input is closely connected with the VOUT pin of the linear voltage regulator Q2, which provides a stable 3.3V working power supply for the entire comparison circuit 3. This connection allows the inverting input of the voltage comparator U2 to obtain a stable reference voltage. The non-inverting input of the voltage comparator U2 is connected with the output of the voltage follower U1, and the signal output by the voltage follower U1 is the processed temperature signal voltage. This connection ensures that the voltage comparator U2 can accurately compare the temperature signal voltage with the reference voltage at the inverting input. The output of the voltage comparator U2 is directly connected with the constant-current trigger circuit 4, which outputs the corresponding level signal according to the comparison result, providing the trigger basis for the constant-current trigger circuit 4, thereby realizing the control of the subsequent circuit.

[0111] The voltage stabilizing tube ZD1 plays a key role in limiting amplitude and protection in the circuit. Its negative electrode is connected with the output of the voltage comparator U2, and its positive electrode is connected with GND. When the voltage output by the voltage comparator U2 exceeds the voltage stabilizing value of the voltage stabilizing tube ZD1, the voltage stabilizing tube ZD1 will quickly conduct and clamp the output voltage near the voltage stabilizing value, preventing excessive voltage from damaging the subsequent constant-current trigger circuit 4 and ensuring the safe and stable operation of the circuit.

[0112] One end of the second resistor R2 is connected with the VOUT pin of the linear voltage regulator Q2 to obtain a stable power voltage, and the other end is connected with the output of the voltage comparator U2. The second resistor R2 mainly plays a role in current limiting and voltage dividing in the circuit. It can limit the current passing through the output of the voltage comparator U2 to prevent damage to the elements caused by excessive current. At the same time, it forms a voltage dividing circuit with the seventh resistor R7 to adjust and stabilize the output voltage of the voltage comparator U2.

[0113] One end of the seventh resistor R7 is connected with the output of the voltage comparator U2, and the other end is connected with GND. In cooperation with the second resistor R2, it forms a voltage dividing circuit to provide a suitable load for the output of the voltage comparator U2, which helps to stabilize the output voltage and can affect the level characteristics of the output signal, making the output signal more suitable for the requirements of the subsequent circuit.

[0114] In addition, to further optimize the circuit performance, enhance the stability and reliability of the circuit, the comparison circuit 3 also ingeniously incorporates the third capacitor C3, the fifth capacitor C5, the fifth resistor R5, the sixth resistor R6 and the ninth resistor R9 and other auxiliary elements.

[0115] The power supply pin of the voltage comparator U2 is connected to the VOUT pin of the linear voltage regulator Q2, ensuring that the voltage comparator U2 can obtain stable working power supply, which is the basis for its normal operation. Stable power supply can ensure the stable operation of the internal circuit of the voltage comparator U2, improve the accuracy and reliability of the comparison. The ground pin of the voltage comparator U2 is connected to GND, providing a common reference potential for the entire circuit, allowing the input and output signals of the voltage comparator U2 to be transmitted and processed at the correct level.

[0116] One end of the third capacitor C3 is connected to the power supply pin of the voltage comparator U2, and the other end is connected to GND. In the circuit, the third capacitor C3 mainly plays a role in power filtering. It can filter out high-frequency ripple and noise in the power supply, providing a more pure and stable power supply environment for the voltage comparator U2, reducing the interference of power supply noise on the operation of the voltage comparator U2, thereby improving the stability and reliability of the comparison circuit.

[0117] One end of the fifth capacitor C5 is connected to the output terminal of the voltage comparator U2, and the other end is connected to GND. The fifth capacitor C5 plays a role in output filtering and decoupling in the circuit. It can filter out high-frequency noise and interference components in the output signal of the voltage comparator U2, making the output signal smoother and more stable, reducing the influence of output signal fluctuations on the subsequent constant current trigger circuit 4, and improving the anti-interference ability of the entire system.

[0118] The sixth resistor R6 is connected in series to the output terminal of the voltage comparator U2. The sixth resistor R6 mainly plays a role in current limiting and impedance matching in the circuit. It can limit the current through the output terminal, protecting the voltage comparator U2 and the subsequent constant current trigger circuit 4 from excessive current impact. At the same time, by adjusting the resistance value of the sixth resistor R6, impedance matching between the output terminal and the subsequent circuit can be achieved, improving the efficiency and quality of signal transmission.

[0119] One end of the ninth resistor R9 is connected between one end of the sixth resistor R6 and the constant current trigger circuit 4, and the other end is connected to GND. The ninth resistor R9 and the sixth resistor R6 together form a voltage dividing and filtering circuit. It can further divide the output signal of the voltage comparator U2, making the signal level input to the constant current trigger circuit 4 more appropriate. At the same time, the ninth resistor R9 can also cooperate with the fifth capacitor C5 to enhance the filtering effect and remove residual noise and interference in the output signal.

[0120] The fifth resistor R5 is connected in series between the non-inverting input terminal of the voltage comparator U2 and the output terminal of the voltage follower U1. The fifth resistor R5 mainly plays a role of current limiting and protection in the circuit. It can limit the current flowing from the output terminal of the voltage follower U1 into the non-inverting input terminal of the voltage comparator U2, preventing the current from being too large to cause damage to the voltage comparator U2 and the voltage follower U1. At the same time, the fifth resistor R5 can also isolate the mutual influence between the two circuits to some extent, improving the stability of the circuit.

[0121] In the comparison circuit 3 of the present embodiment, the temperature signal voltage output by the voltage follower U1 is transmitted to the non-inverting input terminal of the voltage comparator U2, and the stable reference voltage provided by the VOUT pin of the linear voltage regulator Q2 is connected to the inverting input terminal of the voltage comparator U2. The voltage comparator U2 compares the two input voltages, and outputs a high level when the voltage of the non-inverting input terminal is higher than that of the inverting input terminal, and outputs a low level otherwise.

[0122] The voltage limiting tube ZD1 limits the output voltage of the voltage comparator U2 to prevent the output voltage from being too high. The voltage adjustment and stabilization of the output voltage are realized by the voltage dividing circuit composed of the second resistor R2 and the seventh resistor R7. The third capacitor C3 filters the power supply of the voltage comparator U2 to ensure the stability of the power supply. The fifth capacitor C5 filters and decouples the output signal to make the output signal smoother. The sixth resistor R6 and the ninth resistor R9 further process the output signal to make it more suitable for the subsequent constant current trigger circuit 4. The fifth resistor R5 limits the current of the signal input to the non-inverting input terminal of the voltage comparator U2.

[0123] The level signal output by the comparison circuit 3 after processing is transmitted to the constant current trigger circuit 4, providing a trigger control signal for the constant current trigger circuit 4, so as to realize accurate control and protection of the entire circuit system.

[0124] Please refer to Figure 5 In an embodiment of the present embodiment, the circuit architecture of the constant current trigger circuit 4 includes an NMOS tube Q1 (model number AO3400A), an operational amplifier U3, and a sampling resistor R11. The connection mode, function, and working principle of each element and the overall circuit will be described comprehensively and in depth.

[0125] As the key power switch element in the constant-current trigger circuit 4, the NMOS tube Q1 (AO3400A) has excellent characteristics such as low on-resistance and high switching speed, which can effectively control the on-off of the current. The source of the NMOS tube Q1 is connected to GND in series with the sampling resistor R11, and this connection allows the sampling resistor R11 to monitor the current flowing through the source of the NMOS tube Q1 in real time. The drain of the NMOS tube Q1 is directly connected to the fuse, and when the NMOS tube Q1 is turned on, the current will flow through the drain to the fuse, providing the required current drive for the action of the fuse.

[0126] The operational amplifier U3 plays a core control role in the constant-current trigger circuit 4, and it realizes precise and stable control of the current through a negative feedback mechanism. The non-inverting input of the operational amplifier U3 is connected to the output of the voltage comparator U2, and is used to receive the control signal output by the comparison circuit 3. This signal will determine the output state of the operational amplifier U3, and in turn control the on-off of the NMOS tube Q1. The output of the operational amplifier U3 is connected to the gate of the NMOS tube Q1, and by outputting different voltage signals, it adjusts the gate voltage of the NMOS tube Q1, thereby controlling the degree of conduction. The inverting input of the operational amplifier U3 is connected between the source of the NMOS tube Q1 and the sampling resistor R11, and this connection forms a key link in the negative feedback loop. The voltage signal across the sampling resistor R11 is fed back to the inverting input of the operational amplifier U3, and compared with the reference signal at the non-inverting input. The operational amplifier U3 automatically adjusts the output voltage based on the comparison result to maintain the stability of the current.

[0127] The sampling resistor R11 plays an important role in current detection in the circuit. According to Ohm's law, when current flows through the sampling resistor R11, a voltage drop proportional to the current size will be generated across it. This voltage drop signal is fed back to the inverting input of the operational amplifier U3 as a feedback quantity for current control. By accurately selecting the resistance value of the sampling resistor R11, precise detection and control of the current can be achieved, ensuring that the current flowing through the fuse is stable at the set value.

[0128] In addition, to further optimize the performance of the circuit, enhance the stability and reliability of the circuit, and meet the needs of actual circuit connection and functional expansion, the constant-current trigger circuit 4 also ingeniously incorporates the first interface JP1, the tenth resistor R10, the third resistor R3, the fourth resistor R4, and the first capacitor C1, among other auxiliary elements.

[0129] The power pin of the operational amplifier U3 is connected to the VOUT pin of the linear voltage regulator Q2 in series with the third resistor R3. The linear voltage regulator Q2 provides a stable power voltage for the entire circuit, and the third resistor R3 functions as a current limiter and protects the operational amplifier U3 from excessive current flow, ensuring its normal operation. The ground pin of the operational amplifier U3 is connected to GND, providing a stable reference potential for the circuit, allowing the input and output signals of the operational amplifier U3 to be transmitted and processed at the correct level.

[0130] The tenth resistor R10 is connected in series with the inverting input of the operational amplifier U3, mainly functioning as a current limiter and protecting the inverting input of the operational amplifier U3 in the circuit. At the same time, the tenth resistor R10 can also form a certain voltage division and filtering network with elements such as the sampling resistor R11, appropriately processing the feedback signal and improving the stability and anti-interference ability of the circuit.

[0131] The first interface JP1 provides a flexible connection method for the circuit, facilitating connection with other external circuits or elements. The second input pin of the first interface JP1 is connected to the drain of the NMOS transistor Q1, the first input pin is connected between the third resistor R3 and the VOUT pin of the linear voltage regulator Q2, and the output pin is connected to the fuse. This connection method allows the first interface JP1 to effectively transmit power signals and current signals, while providing a convenient interface for the connection of the fuse.

[0132] One end of the fourth resistor R4 is connected to the first input pin of the first interface JP1, and the other end is connected between the output of the operational amplifier U3 and the gate of the NMOS transistor Q1. The fourth resistor R4 functions as a voltage divider and signal regulator in the circuit. It can divide the voltage signal output by the operational amplifier U3, making the voltage input to the gate of the NMOS transistor Q1 more appropriate, thereby more accurately controlling the conduction degree of the NMOS transistor Q1. At the same time, the fourth resistor R4 can also isolate the mutual influence between the output of the operational amplifier U3 and other circuits to some extent, improving the stability of the circuit.

[0133] One end of the first capacitor C1 is connected between the third resistor R3 and the VOUT pin of the linear voltage regulator Q2, and the other end is connected to GND. The first capacitor C1 mainly functions as a power filter in the circuit. It can filter out high-frequency ripples and noise in the power supply, providing a purer and more stable power environment for the operational amplifier U3, reducing the interference of power noise on the operation of the operational amplifier U3, and thus improving the stability and reliability of the constant-current trigger circuit 4.

[0134] In the constant current trigger circuit 4 of the embodiment, when the signal output by the comparison circuit 3 is transmitted to the non-inverting input terminal of the operational amplifier U3, the operational amplifier U3 compares the signal with the voltage signal across the sampling resistor R11 fed back to the inverting input terminal. If the voltage at the non-inverting input terminal is higher than that at the inverting input terminal, the operational amplifier U3 outputs a high level, making the NMOS transistor Q1 conduct, and the current starts to flow through the NMOS transistor Q1, the sampling resistor R11 and the fuse.

[0135] With the current flowing, a voltage drop proportional to the current is generated across the sampling resistor R11, and the voltage signal is fed back to the inverting input terminal of the operational amplifier U3. The operational amplifier U3 constantly compares the voltages at the non-inverting and inverting input terminals, and automatically adjusts the output voltage through the negative feedback mechanism to maintain the balance between the voltages at the non-inverting and inverting input terminals. When the current reaches the set value of 1.36 A, the voltage across the sampling resistor R11 makes the voltage at the inverting input terminal of the operational amplifier U3 equal to that at the non-inverting input terminal, at which time the circuit reaches a stable state, and the current stabilizes at 1.36 A, realizing the constant current driving of the fuse.

[0136] The first interface JP1 provides a flexible connection mode for the circuit, facilitating the connection and debugging of the circuit with external circuits. The auxiliary elements such as the tenth resistor R10, the fourth resistor R4 and the first capacitor C1 cooperate with each other to process the signals of the circuit, such as current limiting, voltage dividing and filtering, thereby improving the stability, anti-interference ability and control precision of the circuit.

[0137] In summary, the constant current trigger circuit 4 in the embodiment realizes the precise constant current driving control of the fuse through reasonable component selection, careful circuit design and ingenious connection mode, thereby providing an important guarantee for the stable operation and reliable action of the entire circuit system.

[0138] Although the terms such as reference voltage acquisition circuit and temperature signal acquisition circuit are used more frequently in the present application, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present application; any additional limitation is contrary to the spirit of the present application.

[0139] Finally, it should be noted that although the above embodiments have been described in the specification and drawings of the present application, the patent protection scope of the present application should not be limited. Any technical solutions obtained by replacing or modifying the equivalent structures or equivalent processes based on the essential concept of the present application, and directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are included in the patent protection scope of the present application.

Claims

1. A temperature-triggered fuse control circuit, characterized in that, It includes a reference voltage acquisition circuit (1), a temperature signal acquisition circuit (2), a comparison circuit (3), and a constant current trigger circuit (4); among which, The reference voltage acquisition circuit (1), temperature signal acquisition circuit (2), and constant current trigger circuit (4) are respectively connected to the comparison circuit (3); The reference voltage acquisition circuit (1) is used to provide a reference voltage value; The temperature signal acquisition circuit (2) is used to acquire the temperature signal of the copper busbar and convert the temperature signal into an acquisition voltage value; The comparison circuit (3) is used to compare the reference voltage value with the acquired voltage value, and output a signal to the constant current trigger circuit (4) when the acquired voltage value is greater than the reference voltage value. The constant current trigger circuit (4) is used to output a constant current when it receives the signal output by the comparison circuit (3) to drive the fuse to operate.

2. The temperature-triggered fuse control circuit according to claim 1, characterized in that, The reference voltage acquisition circuit (1) includes a third interface JP3, a linear regulator Q2, and a sliding rheostat R12; The input pin of the third interface JP3 is connected to an external DC power supply, and the first output pin of the third interface JP3 is connected to GND. The VIN pin of the linear regulator Q2 is connected to the second output pin of the third interface JP3, and the VOUT pin of the linear regulator Q2 is connected to the temperature signal acquisition circuit (2) and the sliding rheostat R12 respectively. The sliding rheostat R12 is connected to the comparator circuit (3).

3. The temperature-triggered fuse control circuit according to claim 2, characterized in that, The reference voltage acquisition circuit (1) also includes a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8 and a ninth capacitor C9; One end of the sixth capacitor C6 is connected to the slider of the sliding rheostat R12, and the other end is connected to the resistance coil of the sliding rheostat R12. One end of the seventh capacitor C7 is connected between the third interface JP3 and the VIN pin of the linear regulator Q2, and the other end is connected to GND; The eighth capacitor C8 and the ninth capacitor C9 are respectively connected at one end to the VOUT pin of the linear regulator Q2 and at the other end to GND.

4. The temperature-triggered fuse control circuit according to claim 2, characterized in that, The temperature signal acquisition circuit (2) includes a temperature sensor RT1, a first resistor R1, and a voltage follower U1 composed of an operational amplifier; The temperature sensor RT1 is mounted on a copper busbar and connected to the non-inverting input terminal of the voltage follower U1. One end of the first resistor R1 is connected to the non-inverting input of the voltage follower U1, and the other end is connected to the VOUT pin of the linear regulator Q2; The output terminal of the voltage follower U1 is connected to the comparator circuit (3), and the inverting input terminal of the voltage follower U1 is connected to the output terminal of the voltage follower U1.

5. The temperature-triggered fuse control circuit according to claim 4, characterized in that, The temperature signal acquisition circuit (2) also includes a second interface JP2, a fourth capacitor C4, and a second capacitor C2; The input pin of the second interface JP2 is connected to the temperature sensor RT1, the second output pin of the second interface JP2 is connected to the non-inverting input of the voltage follower U1, and the first output pin of the second interface JP2 is connected to GND. One end of the fourth capacitor C4 is connected to the non-inverting input of the voltage follower U1, and the other end is connected to GND; The power supply pin of the voltage follower U1 is connected to the VOUT pin of the linear regulator Q2, and the ground pin of the voltage follower U1 is connected to GND. One end of the second capacitor C2 is connected to the power supply pin of the voltage follower U1, and the other end is connected to GND.

6. The temperature-triggered fuse control circuit according to claim 4, characterized in that, The comparison circuit (3) includes a voltage comparator U2, a second resistor R2, a seventh resistor R7, and a Zener diode ZD1; The inverting input of the voltage comparator U2 is connected to the VOUT pin of the linear regulator Q2, the non-inverting input of the voltage comparator U2 is connected to the output of the voltage follower U1, and the output of the voltage comparator U2 is connected to the constant current trigger circuit (4). The negative terminal of the Zener diode ZD1 is connected to the output terminal of the voltage comparator U2, and the positive terminal of the Zener diode ZD1 is connected to GND. One end of the second resistor R2 is connected to the VOUT pin of the linear regulator Q2, and the other end is connected to the output of the voltage comparator U2; One end of the seventh resistor R7 is connected to the output of the voltage comparator U2, and the other end is connected to GND.

7. The temperature-triggered fuse control circuit according to claim 6, characterized in that, The comparison circuit (3) also includes a third capacitor C3, a fifth capacitor C5, a fifth resistor R5, a sixth resistor R6 and a ninth resistor R9; The power supply pin of the voltage comparator U2 is connected to the VOUT pin of the linear regulator Q2, and the ground pin of the voltage comparator U2 is connected to GND. One end of the third capacitor C3 is connected to the power supply pin of the voltage comparator U2, and the other end is connected to GND; One end of the fifth capacitor C5 is connected to the output terminal of the voltage comparator U2, and the other end is connected to GND; The sixth resistor R6 is connected in series at the output terminal of the voltage comparator U2; One end of the ninth resistor R9 is connected between one end of the sixth resistor R6 and the constant current trigger circuit (4), and the other end is connected to GND; The fifth resistor R5 is connected in series between the non-inverting input of the voltage comparator U2 and the output of the voltage follower U1.

8. The temperature-triggered fuse control circuit according to claim 6, characterized in that, The constant current trigger circuit (4) includes an NMOS transistor Q1, an operational amplifier U3, and a sampling resistor R11; The source of the NMOS transistor Q1 is connected to GND in series with the sampling resistor R11, and the drain of the NMOS transistor Q1 is connected to the fuse. The non-inverting input of the operational amplifier U3 is connected to the output of the voltage comparator U2, the output of the operational amplifier U3 is connected to the gate of the NMOS transistor Q1, and the inverting input of the operational amplifier U3 is connected between the source of the NMOS transistor Q1 and the sampling resistor R11.

9. The temperature-triggered fuse control circuit according to claim 8, characterized in that, The constant current trigger circuit (4) also includes a first interface JP1, a tenth resistor R10, a third resistor R3, a fourth resistor R4 and a first capacitor C1; The power supply pin of the operational amplifier U3 is connected in series with the third resistor R3 and then connected to the VOUT pin of the linear regulator Q2. The ground pin of the operational amplifier U3 is connected to GND. The tenth resistor R10 is connected in series with the inverting input terminal of the operational amplifier U3; The second input pin of the first interface JP1 is connected to the drain of the NMOS transistor Q1, the first input pin of the first interface JP1 is connected between the third resistor R3 and the VOUT pin of the linear regulator Q2, and the output pin of the first interface JP1 is connected to the fuse. One end of the fourth resistor R4 is connected to the first input pin of the first interface JP1, and the other end is connected between the output of the operational amplifier U3 and the gate of the NMOS transistor Q1. One end of the first capacitor C1 is connected between the third resistor R3 and the VOUT pin of the linear regulator Q2, and the other end is connected to GND.

10. The temperature-triggered fuse control circuit according to claim 1, characterized in that, The reference voltage acquisition circuit (1), temperature signal acquisition circuit (2), comparison circuit (3) and constant current trigger circuit (4) are electrically connected through the PCB copper layer.

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