A temperature-triggered fuse control circuit

Abstract

The utility model relates to the technical field of fuse, disclose a kind of based on temperature trigger's fuse control circuit, can significantly improve the security and reliability of circuit protection. First, temperature signal acquisition circuit can accurately collect the temperature signal of copper bar and convert into voltage value, compare with the reference voltage provided by reference voltage acquisition circuit, to realize high-precision monitoring to temperature variation, can capture weak fault characteristic temperature variation in time, so that fuse can respond rapidly in the early stage of fault, effectively reduce the risk of fault expansion. Secondly, the circuit design has good anti-interference ability, can work stably in complex electromagnetic environment, avoid misfire or delayed response, ensure normal operation of circuit and timely processing of fault. Thirdly, its response logic is flexible, can high-speed action cut off fault circuit, and can avoid causing damage to normal circuit, meet the protection needs of modern complex electronic system.

Description

Technical Field

[0001] This utility model relates to the field of fuse technology, and in particular to a temperature-triggered fuse control circuit. Background Technology

[0002] As a core component of circuit protection systems, fuses play an irreplaceable role in ensuring the safe and stable operation of circuits. Their applications are extremely wide-ranging, encompassing not only traditional high and low voltage power distribution systems and various control equipment, but also being deeply applied in the booming new energy field. Especially with the rapid rise of the new energy vehicle industry, the importance of fuses is increasingly prominent in high-capacity power supply scenarios such as battery packs. Due to the large current and high energy in these scenarios, short circuits or excessively high temperatures can potentially lead to serious accidents such as battery explosions and circuit fires, causing enormous losses to life and property.

[0003] However, current fuse control technologies have revealed several significant and urgent shortcomings in practical applications. Firstly, in terms of temperature signal monitoring, existing technologies suffer from severely insufficient monitoring accuracy. Temperature signals are often a crucial indicator of circuit abnormalities, but current technologies struggle to capture subtle temperature changes characteristic of faults in real time and accurately. This prevents timely and effective measures from being taken in the early stages of a fault, increasing the risk of fault escalation. Secondly, their anti-interference capability is extremely weak. In modern electronic systems, electromagnetic fields are ubiquitous, and current fuse control technologies lack effective anti-interference mechanisms when facing electromagnetic disturbances, making them prone to false triggering or delayed response. False triggering can lead to unnecessary circuit interruptions, affecting the normal operation of the system; delayed response may prevent timely fault handling, leading to more serious consequences. Thirdly, the response logic is too rigid. Modern electronic systems demand that fuse control technologies possess both the ability to operate at high speed to quickly disconnect faulty circuits and the ability to ensure safety protection, avoiding accidental damage to normal circuits. However, the response logic of current technologies cannot simultaneously meet these two requirements, making it difficult to satisfy the protection needs of modern complex electronic systems. Traditional solutions mainly rely on simple voltage comparison or mechanical fuse mechanisms. This single and outdated approach will experience a sharp decline in performance when faced with complex electromagnetic environments or transient impacts, and cannot guarantee the safe and reliable operation of the circuit at all.

[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 capabilities and intelligent response capabilities.

[0005] The above information is provided as background information only to aid in understanding this disclosure and does not constitute an assertion or admission that any of the above content can be used as prior art relative to this disclosure. Utility Model Content

[0006] This invention provides a temperature-triggered fuse control circuit to solve the problems existing in the prior art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A temperature-triggered fuse control circuit includes a reference voltage acquisition circuit, a temperature signal acquisition circuit, a comparator 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 respectively connected to the comparison circuit;

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

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

[0012] The comparison circuit is used to compare the reference voltage value with the acquired voltage value, and outputs a signal to the constant current trigger circuit when the acquired voltage value is greater than the reference voltage value.

[0013] The constant current trigger circuit is used to output a constant current when it receives the signal output by the comparator circuit, so as to drive the fuse to operate.

[0014] Furthermore, in the temperature-triggered fuse control circuit, the reference voltage acquisition circuit includes a third interface JP3, a linear regulator Q2, and a sliding rheostat R12;

[0015] 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.

[0016] 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 and the sliding rheostat R12 respectively.

[0017] The sliding rheostat R12 is connected to the comparator circuit.

[0018] Furthermore, in the temperature-triggered fuse control circuit, the reference voltage acquisition circuit also includes 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 to the slider of the sliding rheostat R12, and the other end is connected to the resistance coil of the sliding rheostat R12.

[0020] 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;

[0021] 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.

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

[0023] The temperature sensor RT1 is mounted on a copper busbar and connected to the non-inverting input terminal of the voltage follower U1.

[0024] 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;

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

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

[0027] 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.

[0028] 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;

[0029] 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.

[0030] 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.

[0031] Furthermore, in the temperature-triggered fuse control circuit, the comparison circuit includes a voltage comparator U2, a second resistor R2, a seventh resistor R7, and a Zener diode ZD1;

[0032] 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.

[0033] 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.

[0034] 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;

[0035] 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.

[0036] Furthermore, in the temperature-triggered fuse control circuit, the comparison circuit also includes 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 to the VOUT pin of the linear regulator Q2, and the ground pin of the voltage comparator U2 is connected to GND.

[0038] 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;

[0039] 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;

[0040] The sixth resistor R6 is connected in series at the output terminal 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 to GND;

[0042] 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.

[0043] Furthermore, in the temperature-triggered fuse control circuit, the constant current trigger circuit includes an NMOS transistor Q1, an operational amplifier U3, and a sampling resistor R11;

[0044] 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.

[0045] 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.

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

[0047] 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.

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

[0049] 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.

[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 of the operational amplifier U3 and the gate of the NMOS transistor Q1.

[0051] 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.

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

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

[0054] This invention provides a temperature-triggered fuse control circuit that effectively overcomes many shortcomings of existing fuse control technologies, significantly improving the safety and reliability of circuit protection. First, the temperature signal acquisition circuit accurately acquires the temperature signal of the copper busbar and converts it into a voltage value, comparing it with a reference voltage provided by a reference voltage acquisition circuit. This enables high-precision monitoring of temperature changes, allowing for timely detection of subtle fault-indicating temperature changes, enabling the fuse to respond quickly in the early stages of a fault and effectively reducing the risk of fault escalation. Second, the circuit design has excellent anti-interference capabilities, operating stably in complex electromagnetic environments, avoiding false triggering or delayed response, ensuring normal circuit operation and timely fault handling. Furthermore, its response logic is flexible, capable of high-speed disconnection of faulty circuits while avoiding accidental damage to normal circuits, meeting the protection needs of modern complex electronic systems and providing a safer and more reliable circuit protection solution for high-reliability electronic systems such as new energy vehicles.

[0055] This invention has other features and advantages that will be apparent from or will be set forth in detail in the accompanying drawings and the following detailed description, which together serve to explain the particular principles of this invention. Attached Figure Description

[0056] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0057] Figure 1 This is a schematic diagram of the circuit principle of a temperature-triggered fuse control circuit provided in an embodiment of the present invention;

[0058] Figure 2 This is a schematic diagram of the reference voltage acquisition circuit provided in this embodiment of the utility model;

[0059] Figure 3 This is a schematic diagram of the circuit principle of the temperature signal acquisition circuit provided in this embodiment of the utility model;

[0060] Figure 4 This is a schematic diagram of the circuit principle of the comparison circuit provided in this embodiment of the utility model;

[0061] Figure 5 This is a schematic diagram of the constant current trigger circuit provided in this embodiment of the utility model.

[0062] Figure label:

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

[0064] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0065] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0066] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0067] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.

[0068] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.

[0069] Unless otherwise specified, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0070] In this application, expressions such as "greater than", "less than", and "exceeding" are understood to exclude the stated number; expressions such as "above", "below", and "within" are understood to include the stated number. Furthermore, in the description of the embodiments of this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times", unless otherwise explicitly specified.

[0071] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0072] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this application pertains, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0073] Please refer to Figure 1 This utility model embodiment provides a temperature-triggered fuse control circuit, including 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 perspective of the connection relationships between the modules, the reference voltage acquisition circuit 1, the temperature signal acquisition circuit 2, and the constant current trigger circuit 4 have established stable electrical connections with the comparator circuit 3. This connection method ensures efficient and accurate data transmission and interaction between the modules, laying a solid foundation for the normal operation of the entire fuse control circuit.

[0075] Specifically, the reference voltage acquisition circuit 1 plays a crucial role in providing a reference voltage value. Through a carefully designed 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] Temperature signal acquisition circuit 2 focuses on acquiring the temperature signal of the copper busbar. In practical applications, the copper busbar is a key conductive component in the circuit, and its temperature changes directly reflect the circuit's operating status and potential fault information. Temperature signal acquisition circuit 2 utilizes advanced temperature sensor technology and signal processing algorithms to acquire the copper busbar's temperature signal in real time and accurately, and cleverly converts this temperature signal into a corresponding acquisition voltage value. This conversion process not only achieves digital processing of the temperature signal but also facilitates subsequent comparison with a reference voltage.

[0077] Comparator 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 reference voltage acquisition circuit 1 and the acquired voltage value from temperature signal acquisition circuit 2, and performs a detailed and precise comparison and analysis of these two voltage values. When comparator circuit 3 determines that the acquired voltage value is greater than the reference voltage value, it indicates that the temperature of the copper busbar has exceeded the preset safety threshold, potentially posing a risk of failure. At this time, comparator circuit 3 will quickly output a specific signal to constant current trigger circuit 4 to trigger subsequent fuse protection actions.

[0078] Upon receiving the signal from the comparator circuit 3, the constant current trigger circuit 4 immediately starts operating. Through its internal circuit design and control strategy, it outputs a constant current. This constant current is stable and reliable, providing sufficient driving energy to the fuse, enabling it to trip quickly and disconnect the faulty circuit, preventing further expansion and spread of the fault.

[0079] The temperature-triggered fuse control circuit proposed in this embodiment of the invention has significant technical advantages and innovative value. It can effectively overcome many defects in existing fuse control technologies, bringing a brand-new solution to the field of circuit protection and greatly improving the safety and reliability of circuit protection.

[0080] Firstly, in terms of temperature monitoring, the temperature signal acquisition circuit demonstrates superior performance. It can acquire the temperature signal of the copper busbar with extremely high precision and accurately convert it into a voltage value. By comparing it with a precise reference voltage provided by the reference voltage acquisition circuit, it achieves refined and high-precision monitoring of temperature changes. This high-precision monitoring capability allows the circuit to promptly capture even the most subtle fault-indicating temperature changes; even minute temperature fluctuations can be keenly detected. Once an abnormal temperature change is detected, the fuse can respond quickly in the early stages of a fault, promptly cutting off the circuit, effectively reducing the risk of the fault escalating and providing strong protection for the safe operation of the circuit system.

[0081] Secondly, this circuit design possesses excellent anti-interference capabilities. In modern electronic systems, the electromagnetic environment is complex and ever-changing, with various electromagnetic interferences ubiquitous. These interferences can severely impact the normal operation of circuits, leading to problems such as false triggering or delayed response. However, the fuse control circuit of this invention, through reasonable circuit layout, optimized component selection, and advanced anti-interference technology, can maintain stable performance in complex electromagnetic environments. It can effectively resist the influence of external electromagnetic interference, avoiding malfunctions or delayed responses caused by interference, ensuring the circuit operates normally in various harsh environments, and enabling timely and accurate fault handling.

[0082] Furthermore, the circuit's response logic is flexible and adaptable, fully meeting the protection needs of modern complex electronic systems. Modern electronic systems place higher demands on fuse control technology, requiring both high-speed operation to quickly disconnect the faulty circuit in the event of a fault to prevent further deterioration, and the avoidance of accidental damage to normal circuits under normal operating conditions to ensure stable system operation. This utility model's fuse control circuit, through a carefully designed control strategy and circuit structure, achieves flexible adjustment of the response logic. It can intelligently judge and take corresponding actions according to different operating scenarios and fault conditions, enabling rapid fault response while 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 this utility model has significant advantages in terms of temperature monitoring accuracy, anti-interference capability, and response logic flexibility. It provides an innovative and efficient solution for circuit protection of modern electronic systems and has broad application prospects and important practical value.

[0084] In a specific and optimized implementation of this embodiment, the fuse control circuit innovatively adopts a modular cascaded architecture. This architecture design is highly systematic and forward-looking, dividing the entire fuse control circuit into several independent modules according to function. Each module undertakes a specific functional task, while the modules work together through a reasonable cascading method, thereby constructing a fully functional and high-performance circuit system.

[0085] Specifically, the four core modules—reference voltage acquisition circuit 1, temperature signal acquisition circuit 2, comparison circuit 3, and constant current trigger circuit 4—are electrically connected via a carefully designed PCB (printed circuit board) copper layer. The PCB copper layer, as a crucial channel for current transmission in the circuit, offers advantages such as excellent conductivity and stable, reliable connections. In this embodiment, through a scientifically sound layout and planning of the PCB copper layer, the electrical connections between the modules are ensured to be both simple and efficient, while also possessing excellent signal transmission characteristics.

[0086] From a connection perspective, the PCB copper layer connects the reference voltage acquisition circuit 1, temperature signal acquisition circuit 2, comparator circuit 3, and constant current trigger circuit 4 to each other via the optimal path based on the pin distribution and signal flow of each module. This connection method not only reduces interference and loss during signal transmission, improving signal integrity and accuracy, but also makes the overall circuit structure more compact and the layout more reasonable, which is beneficial for miniaturized circuit design and integrated applications.

[0087] The modular cascaded architecture and PCB copper layer connections combine to create a fuse control circuit that exhibits several significant advantages. Firstly, the modular design allows each module to be designed, debugged, and maintained independently, greatly improving development efficiency and maintainability. When a module malfunctions or requires upgrades, only that module needs to be addressed, without affecting the normal operation of other modules, thus reducing maintenance costs and upgrade complexity. Secondly, the electrical connections achieved through the PCB copper layer ensure the stability and reliability of signal transmission between modules, effectively preventing circuit failures caused by poor connections or signal interference, further enhancing the performance and stability of the entire fuse control circuit.

[0088] Furthermore, this modular cascaded architecture and PCB copper layer connection method facilitates circuit expansion and upgrades. As electronic technology continues to develop and application requirements evolve, it may be necessary to expand the functionality or improve the performance of fuse control circuits. In such cases, circuit upgrades and expansions can be achieved simply by adding corresponding modules to the existing architecture or optimizing and improving existing modules, and connecting and integrating them via PCB copper layers, without requiring a complete circuit redesign. This significantly shortens the development cycle and reduces development costs.

[0089] Please refer to Figure 2 In one embodiment of this invention, the reference voltage acquisition circuit 1 employs a carefully designed circuit structure, whose core components include a third interface JP3, a linear regulator Q2, and a sliding rheostat R12.

[0090] The third interface JP3 serves as the connection hub between the entire reference voltage acquisition circuit 1 and the external power supply, undertaking the crucial task of introducing external DC power. Its input pin is securely connected to the external DC power supply (5V), ensuring a stable power input. Simultaneously, the first output pin of the third interface JP3 is cleverly connected to GND (ground), establishing a stable reference potential for the circuit and laying the foundation for the normal operation of subsequent circuits.

[0091] Linear regulator Q2 (model LM1117-3.3V) plays a crucial role in the circuit, responsible for regulating the input 5V DC power supply. Specifically, the VIN pin of linear regulator Q2 is closely connected to the second output pin of the third interface JP3, thereby obtaining the unregulated 5V DC power supply. After processing by the precise internal voltage regulation circuit of linear regulator Q2, a stable 3.3V voltage is output from its VOUT pin. This stable 3.3V voltage is extremely important. One path directly provides operating power to 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 busbar; the other path serves as the base voltage for the subsequent voltage divider network, providing a guarantee for generating an adjustable reference voltage.

[0092] The variable resistor R12 (selected as a 10kΩ precision adjustable resistor) is the key component in the reference voltage acquisition circuit 1 to achieve adjustable reference voltage. It is connected to the VOUT pin of the linear regulator Q2, forming a voltage divider network. Through this network, a stable 3.3V voltage is converted into a continuously adjustable reference voltage Vref from 0 to 3.3V. In practice, simply adjusting the slider position of the variable resistor R12 changes the resistance ratio in the voltage divider network, thus achieving precise adjustment of the reference voltage Vref. This adjustable reference voltage design offers great flexibility, allowing for easy setting of corresponding temperature thresholds based on different application scenarios and actual needs. When the voltage value converted from the temperature signal acquired by the temperature signal acquisition circuit 2 exceeds the set reference voltage Vref, the comparator circuit 3 will trigger subsequent fuse protection, effectively protecting the circuit.

[0093] The sliding rheostat R12 plays a crucial role not only within the reference voltage acquisition circuit 1 but also through a specific electrical connection to the comparator circuit 3. It accurately transmits the generated adjustable reference voltage Vref to the comparator circuit 3, providing a critical reference for voltage comparison. The comparator circuit 3 compares this reference voltage Vref with the acquired voltage value output by the temperature signal acquisition circuit 2 to determine if there is a risk of circuit failure and whether to trigger the fuse.

[0094] To further optimize the performance of the reference voltage acquisition circuit 1 and improve its stability and anti-interference capability, capacitors such as the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8, and the ninth capacitor C9 are carefully configured in the circuit.

[0095] 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. This connection method allows the sixth capacitor C6 to play a role in filtering and stabilizing the voltage during the adjustment of the reference voltage by the sliding rheostat R12, effectively reducing voltage fluctuations caused by the movement of the slider 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 regulator Q2, and the other end is connected to GND. The seventh capacitor C7 mainly serves as a power supply filter here. It can filter out high-frequency noise and interference signals in the input power supply, providing a cleaner input voltage for the linear regulator Q2, thereby improving the voltage regulation effect of the linear regulator Q2.

[0097] The eighth capacitor C8 and the ninth capacitor C9 are connected at one end to the VOUT pin of the linear regulator Q2 and at the other end to GND. These two capacitors are used in parallel to further enhance the filtering effect, effectively removing residual ripple and noise from the output voltage of the linear regulator Q2. This provides a more stable and clean 3.3V power supply for the temperature signal acquisition circuit 2 and the subsequent voltage divider 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, through reasonable component selection and meticulous circuit design, achieves a stable and adjustable reference voltage output, providing a solid foundation for the normal operation of the entire fuse control circuit. Simultaneously, the coordinated operation and optimized configuration of the components effectively improve the circuit's stability and anti-interference capability, enabling the reference voltage acquisition circuit 1 to adapt to complex and ever-changing electronic environments and providing reliable protection for the circuit.

[0099] Please refer to Figure 3 In one embodiment of this invention, the temperature signal acquisition circuit 2 employs a carefully designed circuit architecture, the core components of which include a temperature sensor RT1, a first resistor R1, and a voltage follower U1 carefully constructed from an operational amplifier. The connection methods, functions, and overall circuit operating principles of each component will be described in detail below.

[0100] As a key component for temperature signal acquisition, temperature sensor RT1 (which can be an NTC thermistor, thermocouple, or other temperature sensing device with high sensitivity and reliability) is precisely mounted on the copper busbar. The copper busbar, as a crucial carrier of current transmission in the circuit, directly reflects the circuit's operating state through temperature changes. Temperature sensor RT1 can accurately and in real-time sense the temperature changes of the copper busbar and convert them into corresponding electrical signals. Temperature sensor RT1 is tightly connected to the non-inverting input of voltage follower U1 (using the LMV321 model, an operational amplifier with excellent characteristics such as low offset voltage, high input impedance, and low output impedance, meeting the high-precision requirements of temperature signal acquisition), ensuring that the acquired temperature signal is transmitted to voltage follower U1 for subsequent processing without attenuation.

[0101] The first resistor R1 (a precision resistor with a resistance of 10kΩ) plays a crucial role in the circuit. One end is securely 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 linear regulator Q2 provides a stable 3.3V operating power supply for the entire temperature signal acquisition circuit 2. The first resistor R1 and the temperature sensor RT1 together form a voltage divider circuit. Through this voltage divider circuit, the electrical signal generated by the resistance value of the temperature sensor RT1 changing with temperature is converted into a suitable voltage signal, so that the voltage follower U1 can effectively process and transmit it.

[0102] Voltage follower U1 is the core processing unit of temperature signal acquisition circuit 2. Its output is directly connected to comparator circuit 3, providing the processed temperature signal voltage to comparator circuit 3. The inverting input of voltage follower U1 is cleverly connected to its output; this unique connection method gives voltage follower U1 the significant characteristics of high input impedance and low output impedance. High input impedance ensures that voltage follower U1 draws almost no current from the voltage divider circuit formed by temperature sensor RT1 and the first resistor R1 when acquiring temperature signals, thus avoiding signal attenuation and distortion caused by current extraction and ensuring the accuracy of temperature signal acquisition. Low output impedance allows voltage follower U1 to provide stable driving capability for the subsequent comparator circuit 3, ensuring that the temperature signal can be accurately transmitted to comparator circuit 3 for further analysis and processing.

[0103] In addition, to further optimize circuit performance and ensure the accuracy and stability of signal acquisition, auxiliary components such as the second interface JP2, the fourth capacitor C4, and the second capacitor C2 are cleverly integrated into the circuit.

[0104] The second interface JP2 serves as a crucial bridge connecting the temperature signal acquisition circuit 2 to external components, featuring a clear and critical connection method. Its input pin is tightly connected to the temperature sensor RT1, ensuring accurate reception of the temperature signal acquired by RT1. The second output pin of the second interface JP2 is connected to the non-inverting input of the voltage follower U1, smoothly transmitting the temperature signal to U1. Simultaneously, the first output pin of the second interface JP2 is connected to GND, providing a stable reference potential for the entire circuit, which helps improve the accuracy and stability of temperature signal acquisition.

[0105] 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. In the circuit, the fourth capacitor C4 mainly serves as a filter and decoupler. It can effectively filter out high-frequency noise and interference signals in the input signal, preventing these noise and interference signals from affecting the normal operation of the voltage follower U1, thereby ensuring that the voltage follower U1 can receive a clean and stable temperature signal and improving the quality of temperature signal acquisition.

[0106] Power supply and ground connections for voltage follower U1: The power supply pin of voltage follower U1 is connected to the VOUT pin of linear regulator Q2 to obtain a stable 3.3V operating power supply. A stable power supply is fundamental for the normal operation of voltage follower U1, ensuring the stable operation of its internal circuitry and thus enabling accurate processing of temperature signals. The ground pin of voltage follower U1 is connected to GND, providing a common reference potential for the circuit and ensuring that the output signal of 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, providing a cleaner and more stable power environment for the voltage follower U1, further improving the working stability and reliability of the voltage follower U1, thereby ensuring that the entire temperature signal acquisition circuit 2 can operate stably for a long time.

[0108] In the temperature signal acquisition circuit 2 of this embodiment, the temperature sensor RT1 senses the temperature change of the copper busbar in real time and converts it into an electrical signal. This electrical signal is converted into a suitable voltage signal by a voltage divider circuit formed by 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, buffers and isolates the input voltage signal, ensuring that the signal is not distorted or attenuated during transmission. Simultaneously, the fourth capacitor C4 and the second capacitor C2 filter the input signal and power supply respectively, removing noise and interference, and improving signal quality and circuit stability. The temperature signal voltage processed by the voltage follower U1 is transmitted from its output terminal to the comparator circuit 3, providing accurate temperature information for subsequent circuit protection decisions.

[0109] Please refer to Figure 4In one embodiment of this invention, the comparator circuit 3 employs a carefully designed circuit architecture. Its core components include a voltage comparator U2 (using the LM393 model, which offers advantages such as low power consumption, high precision, and fast response speed, meeting the accuracy and timeliness requirements of the comparator circuit for signal comparison), a second resistor R2, a seventh resistor R7, and a Zener diode ZD1. The connection methods, functions, and overall circuit operating principles of each component will be comprehensively and thoroughly explained below.

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

[0111] Zener diode ZD1 plays a crucial role in limiting and protecting the circuit. Its negative terminal is connected to the output of voltage comparator U2, and its positive terminal is connected to GND. When the voltage output of voltage comparator U2 exceeds the Zener diode ZD1's regulation value, ZD1 will quickly turn on, clamping the output voltage near the regulation value. This prevents excessive voltage from damaging the subsequent constant current trigger circuit 4, ensuring the safe and stable operation of the circuit.

[0112] One end of the second resistor R2 is connected to the VOUT pin of the linear regulator Q2 to obtain a stable power supply voltage, and the other end is connected to the output terminal of the voltage comparator U2. The second resistor R2 mainly functions as a current limiter and voltage divider in the circuit. It limits the current flowing through the output terminal of the voltage comparator U2, preventing excessive current from damaging the components. Simultaneously, together with the seventh resistor R7, it forms a voltage divider circuit to adjust and stabilize the output voltage of the voltage comparator U2.

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

[0114] In addition, to further optimize circuit performance and enhance circuit stability and reliability, the comparator circuit 3 also cleverly incorporates auxiliary components such as the third capacitor C3, the fifth capacitor C5, the fifth resistor R5, the sixth resistor R6, and the ninth resistor R9.

[0115] The power supply pin of voltage comparator U2 is connected to the VOUT pin of linear regulator Q2, ensuring a stable power supply for voltage comparator U2, which is fundamental to its normal operation. A stable power supply guarantees the stable operation of the internal circuitry of voltage comparator U2, improving the accuracy and reliability of comparison. The ground pin of voltage comparator U2 is connected to GND, providing a common reference potential for the entire circuit, enabling the input and output signals of voltage comparator U2 to be transmitted and processed at the correct levels.

[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 serves as a power supply filter. It can filter out high-frequency ripple and noise in the power supply, providing a cleaner and more 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 comparator circuit.

[0117] One end of the fifth capacitor C5 is connected to the output of voltage comparator U2, and the other end is connected to GND. The fifth capacitor C5 serves as an output filter and decoupler in the circuit. It filters out high-frequency noise and interference components in the output signal of voltage comparator U2, making the output signal smoother and more stable, reducing the impact of output signal fluctuations on the subsequent constant current trigger circuit 4, and improving the overall system's anti-interference capability.

[0118] The sixth resistor, R6, is connected in series at the output of voltage comparator U2. Its main functions in the circuit are current limiting and impedance matching. It limits the current flowing through the output, protecting voltage comparator U2 and the subsequent constant current trigger circuit 4 from excessive current surges. Simultaneously, by adjusting the value of R6, impedance matching between the output and subsequent circuitry can be achieved, improving signal transmission efficiency and quality.

[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 divider and filter circuit. This further divides the output signal of the voltage comparator U2, making the signal level input to the constant current trigger circuit 4 more appropriate. Simultaneously, the ninth resistor R9, in conjunction with the fifth capacitor C5, enhances the filtering effect, removing residual noise and interference from the output signal.

[0120] The fifth resistor, R5, is connected in series between the non-inverting input of voltage comparator U2 and the output of voltage follower U1. The fifth resistor R5 primarily functions as a current limiter and protector in the circuit. It limits the current flowing from the output of voltage follower U1 to the non-inverting input of voltage comparator U2, preventing excessive current from damaging both comparators U2 and voltage follower U1. Simultaneously, the fifth resistor R5 also isolates the two circuits from mutual interference to a certain extent, improving circuit stability.

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

[0122] Zener diode ZD1 limits the output voltage of voltage comparator U2 to prevent it from becoming too high. The voltage divider circuit formed by the second resistor R2 and the seventh resistor R7 adjusts and stabilizes the output voltage. The third capacitor C3 filters the power supply to voltage comparator U2 to ensure stability. The fifth capacitor C5 filters and decouples the output signal, making it smoother. The sixth resistor R6 and the ninth resistor R9 further process the output signal to better meet the requirements of the subsequent constant current trigger circuit 4. The fifth resistor R5 provides current limiting protection for the signal input to the non-inverting input of voltage comparator U2.

[0123] The level signal output after processing by the comparator circuit 3 is transmitted to the constant current trigger circuit 4, providing a trigger control signal for the constant current trigger circuit 4, thereby realizing precise control and protection of the entire circuit system.

[0124] Please refer to Figure 5 In one embodiment of this invention, the constant current trigger circuit 4 includes an NMOS transistor Q1 (model AO3400A), an operational amplifier U3, and a sampling resistor R11. The connection method, function, and overall circuit working principle of each component will be comprehensively and thoroughly explained below.

[0125] As a key power switching element in the constant current trigger circuit 4, the NMOS transistor Q1 (AO3400A) possesses excellent characteristics such as low on-resistance and high switching speed, effectively controlling the current flow. Its source is connected in series with a sampling resistor R11 and then to GND. This connection allows the sampling resistor R11 to monitor the current flowing through the source of the NMOS transistor Q1 in real time. The drain of the NMOS transistor Q1 is directly connected to the fuse. When the NMOS transistor Q1 is turned on, current flows through its drain to the fuse, providing the necessary current drive for the fuse to operate.

[0126] Operational amplifier U3 plays a core control role in the constant current trigger circuit 4, achieving precise and stable current control through a negative feedback mechanism. The non-inverting input of operational amplifier U3 is connected to the output of voltage comparator U2, receiving the control signal from comparator circuit 3. This signal determines the output state of operational amplifier U3, thereby controlling the conduction and cutoff of NMOS transistor Q1. The output of operational amplifier U3 is connected to the gate of NMOS transistor Q1, adjusting the gate voltage of NMOS transistor Q1 by outputting different voltage levels, thus controlling its conduction level. The inverting input of operational amplifier U3 is connected between the source of NMOS transistor Q1 and sampling resistor R11; this connection constitutes a key link in the negative feedback loop. The voltage signal across sampling resistor R11 is fed back to the inverting input of operational amplifier U3, compared with the reference signal at the non-inverting input. Operational amplifier U3 automatically adjusts the output voltage based on the comparison result to maintain current stability.

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

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

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

[0130] The tenth resistor, R10, is connected in series with the inverting input of operational amplifier U3. Its main function in the circuit is to limit current and protect the inverting input of operational amplifier U3. Simultaneously, the tenth resistor R10, together with components such as the sampling resistor R11, can form a voltage divider and filter network to appropriately process the feedback signal, improving the circuit's stability and anti-interference capability.

[0131] The first interface JP1 provides a flexible connection method for the circuit, facilitating connection with other external circuits or components. 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 regulator Q2, and the output pin is connected to the fuse. This connection method enables the first interface JP1 to effectively transmit power and current signals, while providing a convenient interface for connecting 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 operational amplifier U3 and the gate of NMOS transistor Q1. The fourth resistor R4 functions as a voltage divider and signal conditioner in the circuit. It divides the voltage signal output from operational amplifier U3, making the voltage input to the gate of NMOS transistor Q1 more appropriate, thus allowing for more precise control of the conduction level of NMOS transistor Q1. Simultaneously, the fourth resistor R4 can also isolate the output of operational amplifier U3 from interference with other circuits to a certain extent, improving circuit stability.

[0133] 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. The first capacitor C1 mainly serves as a power supply filter in the circuit. It can filter out high-frequency ripple and noise in the power supply, providing a cleaner and more stable power supply environment for the operational amplifier U3, reducing the interference of power supply noise on the operation of the operational amplifier U3, thereby improving the stability and reliability of the constant current trigger circuit 4.

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

[0135] As current flows, a voltage drop proportional to the current is generated across the sampling resistor R11. This voltage signal is fed back to the inverting input of operational amplifier U3. Operational amplifier U3 continuously compares the voltages at its non-inverting and inverting inputs, automatically adjusting the output voltage through a negative feedback mechanism to maintain a balance between the voltages at the inverting and non-inverting inputs. When the current reaches the set value of 1.36A, the voltage across the sampling resistor R11 makes the voltage at the inverting input of operational amplifier U3 equal to the voltage at the non-inverting input. At this point, the circuit reaches a steady state, the current stabilizes at 1.36A, and the constant current drives the fuse actuator (i.e., the fuse) to operate.

[0136] The first interface JP1 provides a flexible connection method for the circuit, facilitating connection and debugging with external circuits. Auxiliary components such as the tenth resistor R10, the fourth resistor R4, and the first capacitor C1 work together to perform current limiting, voltage division, and filtering on the circuit signals, improving the circuit's stability, anti-interference capability, and control accuracy.

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

[0138] Although this application frequently uses terms such as reference voltage acquisition circuit and temperature signal acquisition circuit, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

[0139] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this 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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