Enclosed fuse intelligent detection device

Abstract

The utility model belongs to the technical field of fuses, and relates to an intelligent detection device for a closed fuse, which comprises an MCU (Microprogrammed Control Unit), and a current detection circuit, a temperature detection circuit and a state detection circuit which are electrically connected with the MCU, and the MCU is used for controlling the current detection circuit, the temperature detection circuit and the state detection circuit. The current detection circuit is used for monitoring the current condition of the device in real time, the temperature detection circuit is used for detecting the working temperature of the device in real time and providing reference for MCU control, and the state detection circuit is used for monitoring the operation state of the fuse. The detection efficiency and accuracy are obviously improved, and the real-time monitoring and feedback of the operation state of the fuse are ensured; the stability and the safety of the power system are improved; the overheating condition can be found and processed in time, and potential safety hazards caused by too high temperature are prevented; and whether the fuse is in a normal working state or is fused or not can be accurately judged, so that continuous and stable operation of a power system is ensured.

Description

Technical Field

[0001] This utility model relates to the field of fuse technology, and more specifically, to a closed-loop intelligent fuse detection device. Background Technology

[0002] In existing power distribution systems, fuses are crucial protective components, and their safe and stable operation is essential for the reliability of the entire power system. Traditional fuse inspection methods rely heavily on manual inspections, which are not only inefficient but also make it difficult to monitor the fuse status in real time and detect potential faults in a timely manner. Utility Model Content

[0003] To address the aforementioned deficiencies in the existing technology, this utility model provides a closed-type intelligent fuse detection device, comprising:

[0004] The MCU includes a current detection circuit, a temperature detection circuit, and a status detection circuit electrically connected to it. The MCU controls the current detection circuit, the temperature detection circuit, and the status detection circuit. The current detection circuit monitors the current of the device in real time. The temperature detection circuit detects the operating temperature of the device in real time to provide a reference for the control of the MCU. The status detection circuit monitors the operating status of the fuse.

[0005] Preferably, the MCU includes any one of the STM32F103C series and GD32F103.

[0006] Preferably, the current detection circuit includes: pin 1 of the energy metering chip U3 is connected to one end of resistor R23 and one end of capacitor C11 respectively; pin 2 of the energy metering chip U3 is connected to one end of capacitor C12 and one end of resistor R21 respectively; pin 3 of the energy metering chip U3 is connected to one end of resistor R12 and one end of capacitor C13 respectively; pin 4 of the energy metering chip U3 is connected to one end of capacitor C14 and one end of resistor R13 respectively; pin 5 of the energy metering chip U3 is connected to one end of capacitor C15, one end of resistor R19, and one end of resistor R18 respectively; pin 6 of the energy metering chip U3 is connected to one end of capacitor C16 and grounded; and pin 16 of the energy metering chip U3 is connected to one end of capacitor C17 and connected to a 3.3V power supply. The other end of capacitor C11 is connected to the other end of capacitor C12, the other end of resistor R23 is connected to one end of load CR1, the other end of load CR1 is connected to one end of relay K1, the other end of relay K1 is connected to pin 1 of current transformer TA1, the other end of capacitor C13 is connected to the other end of capacitor C14, the other end of resistor R12 is connected to pin 4 of current transformer TA1 and one end of resistor R11 respectively, the other end of resistor R11 is grounded, the other end of resistor R13 is connected to pin 3 of current transformer TA1, the other end of resistor R19 is connected to the other end of capacitor C15, resistor R18 is connected in series with resistors R17, R16, R15 and R14 in sequence, and one end of resistor R14 is connected to AC-DC.

[0007] Preferably, the temperature detection circuit includes: a temperature sensor, a signal amplification circuit, and an analog-to-digital converter electrically connected to each other.

[0008] Preferably, the state detection circuit includes: pin 4 of rectifier bridge DB1 is connected to the anode of diode D1, the anode of diode D2, and the cathode of diode D3 respectively; pin 3 of rectifier bridge DB1 is grounded; the cathode of diode D1 is connected to one end of resistor R1 and the source of transistor Q1 respectively; the drain of transistor Q1 is connected to one end of capacitor C1; the gate of transistor Q1 is connected to the other end of resistor R1 and the drain of transistor Q2 respectively; the source of transistor Q2 is grounded; and the gate of transistor Q2 is connected to the output terminal of battery voltage detection chip U1, one end of resistor R6, and resistor... One end of resistor R5 is connected to the input terminal of battery voltage detection chip U1, one end of resistor R2, and one end of resistor R3. The other end of resistor R2 is connected to the negative terminal of diode D2 and one end of capacitor C2. The other end of resistor R3 is connected to the other end of capacitor C2 and the positive terminal of diode D3 and grounded. The other end of resistor R6 is connected to one end of capacitor C4 and the input terminal of battery voltage detection chip U2. The other end of capacitor C4 is grounded. The output terminal of battery voltage detection chip U2 is connected to the positive terminal of diode D4 and one end of resistor R4.

[0009] Preferably, the power metering chip U3 includes one of the following: HLW8112, CSE7761, R5F10Y series, STMicroelectronics' STPM series, MSP430 series, and PIC24FJ128GA310 series.

[0010] Preferably, the signal amplification circuit includes a signal amplification chip U4, which is connected to the temperature sensor.

[0011] Preferably, the temperature detection circuit further includes a display and alarm circuit.

[0012] Preferably, the signal amplification chip U4 includes any one of LM1875, LM3886, LM4766, LM358, LM324, LM393, LM339, LM386 and AG50.

[0013] Preferably, the display and alarm circuit includes an LED display screen, a sound generator, and a flashlight that are electrically connected.

[0014] The closed-type intelligent fuse detection device of this utility model has the following beneficial effects:

[0015] Through the built-in MCU (microcontroller unit), unified control and management of current detection circuit, temperature detection circuit and status detection circuit are realized, which significantly improves detection efficiency and accuracy. As the core processor, the MCU can quickly respond to and process data from each detection circuit, ensuring real-time monitoring and feedback of the fuse's operating status.

[0016] The current detection circuit can monitor the current in the device in real time and accurately, effectively preventing fuse damage caused by current overload, and improving the stability and safety of the power system.

[0017] The temperature detection circuit monitors the operating temperature of the device in real time, providing the MCU with crucial temperature reference data. This helps to detect and address overheating issues promptly, preventing potential safety hazards caused by excessively high temperatures.

[0018] Status detection circuits are designed to monitor the operating status of fuses, accurately determining whether a fuse is in normal working condition or has blown. This is of great significance for quickly locating faults and shortening maintenance time, thereby ensuring the continuous and stable operation of the power system. Attached Figure Description

[0019] 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 the structures shown in these drawings without creative effort. The utility model will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0020] Figure 1 This is a schematic diagram of the module structure of the closed-type intelligent fuse detection device of this utility model;

[0021] Figure 2 This is a circuit diagram of the current detection circuit in the closed-type intelligent fuse detection device of this utility model;

[0022] Figure 3 This is a circuit diagram of the status detection circuit in the closed-type intelligent fuse detection device of this utility model. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0025] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0026] Please see Figure 1 This is a schematic diagram of the modular structure of the closed-type intelligent fuse detection device of this utility model. Figure 1 As shown, the enclosed fuse intelligent detection device provided in the first embodiment of this utility model includes at least: an MCU, a current detection circuit, a temperature detection circuit and a status detection circuit electrically connected to the MCU. The MCU is used to control the current detection circuit, the temperature detection circuit and the status detection circuit. The current detection circuit is used to monitor the current status of the device in real time. The temperature detection circuit is used to detect the operating temperature of the device in real time and provide a reference for the control of the MCU. The status detection circuit is used to monitor the operating status of the fuse.

[0027] In some optional implementations, the MCU includes any one of the STM32F103C series and GD32F103. In this embodiment, the MCU is selected as STM32F103CBT6 from the STM32F103C series.

[0028] The STM32F103C8T6 employs a high-performance ARM Cortex-M3 32-bit RISC core, operating at 72MHz, and features rich enhanced I / O and peripheral connectivity. Its advantages include high performance, low power consumption, and ease of development, making it suitable for the rapid processing of complex algorithms and tasks.

[0029] The GD32F103 features high performance, low power consumption, and a rich set of peripheral interfaces, supporting multiple programming languages ​​and development environments. Its advantages lie in its high cost-effectiveness and abundant development resources.

[0030] MCU (Microcontroller Unit) is the core control unit of the enclosed fuse intelligent detection device, and its main functions include:

[0031] Control function: The MCU is responsible for controlling the operating status of the current detection circuit, temperature detection circuit, and status detection circuit, ensuring that they can acquire data in real time and accurately.

[0032] Data processing: The MCU receives analog signals from various detection circuits (current detection circuit, temperature detection circuit, and status detection circuit), performs A / D conversion and data processing to evaluate the operating status of the fuse.

[0033] Fault diagnosis: Based on the data from each detection circuit (current detection circuit, temperature detection circuit, and status detection circuit), the MCU can determine whether the fuse has abnormal conditions such as overload, short circuit, or excessive temperature, and take corresponding protective measures.

[0034] Communication function: The MCU can exchange data with the host computer or other intelligent devices through the communication module to realize remote monitoring and fault alarm.

[0035] Figure 2 This is a circuit diagram of the current detection circuit in the closed-type intelligent fuse detection device of this utility model. Figure 2 As shown, in some optional implementations, the current detection circuit includes: pin 1 of the energy metering chip U3 is connected to one end of resistor R23 and one end of capacitor C11 respectively; pin 2 of the energy metering chip U3 is connected to one end of capacitor C12 and one end of resistor R21 respectively; pin 3 of the energy metering chip U3 is connected to one end of resistor R12 and one end of capacitor C13 respectively; pin 4 of the energy metering chip U3 is connected to one end of capacitor C14 and one end of resistor R13 respectively; pin 5 of the energy metering chip U3 is connected to one end of capacitor C15, one end of resistor R19, and one end of resistor R18 respectively; pin 6 of the energy metering chip U3 is connected to one end of capacitor C16 and grounded; pin 16 of the energy metering chip U3 is connected to one end of capacitor C17 and connected to... With a voltage of 3.3V, the other end of capacitor C11 is connected to the other end of capacitor C12, the other end of resistor R23 is connected to one end of load CR1, the other end of load CR1 is connected to one end of relay K1, the other end of relay K1 is connected to pin 1 of current transformer TA1, the other end of capacitor C13 is connected to the other end of capacitor C14, the other end of resistor R12 is connected to pin 4 of current transformer TA1 and one end of resistor R11, the other end of resistor R11 is grounded, the other end of resistor R13 is connected to pin 3 of current transformer TA1, the other end of resistor R19 is connected to the other end of capacitor C15, resistor R18 is connected in series with resistors R17, R16, R15 and R14, and one end of resistor R14 is connected to AC-DC.

[0036] The U3 power metering chip includes one of the following: HLW8112, CSE7761, R5F10Y series, STMicroelectronics' STPM series, MSP430 series, and PIC24FJ128GA310 series.

[0037] The current detection circuit is used to monitor the current status of the intelligent detection device for enclosed fuses in real time. Its main functions include:

[0038] Current sampling: The operating current of the fuse is collected in real time through a high-precision current sensor.

[0039] Signal conversion: Converts the sampled current signal into a voltage signal, which facilitates A / D conversion and data processing by the MCU.

[0040] Overload protection: When the current exceeds the set threshold, the current detection circuit will trigger the protection mechanism to cut off the power supply or issue an alarm signal.

[0041] The temperature detection circuit includes: a temperature sensor, a signal amplification circuit, and an analog-to-digital converter, which are electrically connected.

[0042] A temperature sensor is the core component of a temperature detection circuit, responsible for converting ambient temperature into an electrical signal. Common temperature sensors include thermistors, thermocouples, and semiconductor temperature sensors (such as PN junction diodes or transistors). Thermistors change resistance with temperature, thermocouples generate voltage based on the thermoelectric effect, and semiconductor temperature sensors utilize the characteristic that the voltage of a PN junction changes with temperature.

[0043] The signal amplification circuit includes a signal amplification chip U4, which is connected to the temperature sensor. The signal amplification chip U4 includes any one of the following: LM1875, LM3886, LM4766, LM358, LM324, LM393, LM339, LM386, and AG50.

[0044] Since the signals output by temperature sensors are often weak, they need to be amplified by a signal amplification circuit for subsequent processing. The signal amplification circuit can accurately amplify the temperature signal while maintaining its stability and accuracy.

[0045] An analog-to-digital converter (ADC) is responsible for converting analog temperature signals into digital signals so that they can be further processed by a microprocessor or digital system. It is important to note that the resolution and accuracy of the ADC are crucial to the accuracy of temperature detection.

[0046] In some alternative implementations, the temperature detection circuit also includes a display and alarm circuit. The display and alarm circuit includes an LED display screen, a sound generator, and a flashing light, all electrically connected.

[0047] LED displays consist of unit boards, power supplies, control cards, and wiring. The unit board is the core component of the display, consisting of LED modules, driver chips, and PCB circuit boards.

[0048] The display circuitry presents temperature information to the user in a readable format, such as an LED display or LCD screen. The alarm circuitry issues an alarm when the temperature exceeds a preset range, alerting the user to take appropriate action.

[0049] The temperature detection circuit is used to detect the operating temperature of the intelligent detection device for enclosed fuses in real time. Its main functions include:

[0050] Temperature sampling: The temperature of the fuse and its surrounding environment is collected in real time using temperature sensors (such as thermocouples, resistance temperature detectors, or thermistors).

[0051] Signal conversion: Converts the sampled temperature signal into a voltage or current signal, which facilitates A / D conversion and data processing by the MCU.

[0052] Overheat protection: When the temperature exceeds the set threshold, the temperature detection circuit will trigger the protection mechanism to cut off the power supply or issue an alarm signal.

[0053] Figure 3 This is a circuit diagram of the status detection circuit in the closed-type intelligent fuse detection device of this utility model. Figure 3 As shown, the state detection circuit includes: pin 4 of rectifier bridge DB1 is connected to the anode of diode D1, the anode of diode D2, and the cathode of diode D3, respectively; pin 3 of rectifier bridge DB1 is grounded; the cathode of diode D1 is connected to one end of resistor R1 and the source of transistor Q1, respectively; the drain of transistor Q1 is connected to one end of capacitor C1, respectively; the gate of transistor Q1 is connected to the other end of resistor R1 and the drain of transistor Q2, respectively; the source of transistor Q2 is grounded; and the gate of transistor Q2 is connected to the output terminal of battery voltage detection chip U1, one end of resistor R6, and resistor R... One end of resistor R5 is connected to the input terminal of battery voltage detection chip U1, one end of resistor R2, and one end of resistor R3. The other end of resistor R2 is connected to the negative terminal of diode D2 and one end of capacitor C2. The other end of resistor R3 is connected to the other end of capacitor C2 and the positive terminal of diode D3 and grounded. The other end of resistor R6 is connected to one end of capacitor C4 and the input terminal of battery voltage detection chip U2. The other end of capacitor C4 is grounded. The output terminal of battery voltage detection chip U2 is connected to the positive terminal of diode D4 and one end of resistor R4.

[0054] In some optional implementations, both battery voltage detection chip U1 and battery voltage detection chip U2 may include, but are not limited to, CN301. CN301 is an extremely low-power battery voltage detection chip. Its main function is to monitor the battery's voltage state and output a corresponding level signal according to a preset threshold. This chip is particularly suitable for voltage detection of single or multiple lithium batteries, multiple alkaline batteries, nickel-cadmium batteries, nickel-metal hydride batteries, and multiple lead-acid batteries.

[0055] When the monitored battery voltage is lower than the downlink threshold set by CN301, the chip outputs a low-level signal; conversely, when the battery voltage is higher than the uplink threshold, CN301 outputs a high-level signal. A fixed voltage difference, known as hysteresis, exists between these two thresholds. This characteristic helps eliminate detection output instability caused by power supply noise or load fluctuations leading to battery voltage instability.

[0056] The CN301 operates in an ambient temperature range of -40°C to +85°C and is packaged in a 5-pin SOT23 package. Furthermore, the CN301 features a 60ms pulse delay, a design that effectively filters out monitoring output disturbances caused by noise or other interference, thereby improving system reliability.

[0057] The working principle of the state detection circuit is:

[0058] When there is no power input to the CT, capacitor C2 is de-energized, battery voltage detection chip U1 outputs low, and transistors Q2 and Q1 are cut off. When power is supplied to the CT, because transistor Q1 is cut off, current preferentially flows through diode D2 to charge capacitor C2. Since capacitor C2 has a small capacitance, it charges quickly. After voltage division by resistors R2 and R3, when the comparator set value is reached, battery voltage detection chip U1 outputs high, causing transistors Q2 and Q3 to conduct. Because the supercapacitor has a large capacitance and was initially de-energized, current flows through diode D1 and transistor Q1 to charge the supercapacitor. At this time, capacitor C2 slowly discharges through resistors R2 and R3, and the voltage on capacitor C2 gradually decreases. When the battery voltage detection chip U1 outputs high, it simultaneously charges capacitor C4 through resistor R6. When the voltage on capacitor C2 drops to the lower threshold, the battery voltage detection chip U1 outputs low, capacitor C4 discharges through resistor R6, and transistor Q1 is turned off. Current then charges capacitor C2 again, so the output of battery voltage detection chip U1 quickly becomes high again. Capacitor C4 cannot discharge much. Only when there is no current at the CT input, and the current remains below the discharge time of capacitor C2, causing battery voltage detection chip U1 to output low for a long time, and capacitor C4 to discharge completely, will battery voltage detection chip U2 be triggered to output low. When the falling edge of battery voltage detection chip U2 outputs, it passes through differentiating capacitor C3 and generates a negative pulse on the MCU to wake it up.

[0059] The status detection circuit is used to monitor the operating status of the fuse, and its main functions include:

[0060] Status monitoring: Real-time monitoring of the fuse's open / closed status, partial discharge, etc.

[0061] Signal conversion: Converting the monitored status signals into digital or analog signals that the MCU can recognize.

[0062] Fault warning: When an abnormal condition is detected in the fuse, the status detection circuit will issue a warning signal to remind the operator to carry out maintenance.

[0063] The working process of this novel enclosed intelligent fuse detection device is as follows:

[0064] (1) Initialization: After the system is powered on, the MCU first performs initialization operations, including setting the clock, initializing the I / O ports, configuring the A / D converter, etc.

[0065] (2) Data acquisition: The MCU acquires the current, temperature and status data of the fuse in real time by controlling the current detection circuit, temperature detection circuit and status detection circuit.

[0066] (3) Data processing: The MCU processes and analyzes the collected data, including filtering, A / D conversion, data calibration, etc., to obtain accurate current, temperature and status information.

[0067] (4) Fault diagnosis: The MCU determines whether there is an abnormality in the fuse based on the processed data. For example, when the current exceeds the set threshold, it is judged as overload; when the temperature exceeds the set threshold, it is judged as overheating; when the status sensor detects an abnormal signal, it is judged as fuse failure.

[0068] (5) Protection measures: When an abnormal situation is detected, the MCU will trigger corresponding protection measures, such as cutting off the power supply, issuing an alarm signal, or starting the backup device.

[0069] (6) Communication and alarm: The MCU sends abnormal information to the host computer or other intelligent devices through the communication module to realize remote monitoring and fault alarm.

[0070] The beneficial effects of this utility model, through the design of the above embodiments, are as follows:

[0071] Through the built-in MCU (microcontroller unit), unified control and management of current detection circuit, temperature detection circuit and status detection circuit are realized, which significantly improves detection efficiency and accuracy. As the core processor, the MCU can quickly respond to and process data from each detection circuit, ensuring real-time monitoring and feedback of the fuse's operating status.

[0072] The current detection circuit can monitor the current in the device in real time and accurately, effectively preventing fuse damage caused by current overload, and improving the stability and safety of the power system.

[0073] The temperature detection circuit monitors the operating temperature of the device in real time, providing the MCU with crucial temperature reference data. This helps to detect and address overheating issues promptly, preventing potential safety hazards caused by excessively high temperatures.

[0074] Status detection circuits are designed to monitor the operating status of fuses, accurately determining whether a fuse is in normal working condition or has blown. This is of great significance for quickly locating faults and shortening maintenance time, thereby ensuring the continuous and stable operation of the power system.

[0075] This utility model has been described based on specific embodiments, but those skilled in the art will understand that various changes and equivalent substitutions can be made without departing from the scope of this utility model. Furthermore, to adapt to specific applications of this utility model, numerous modifications can be made without departing from its protection scope. Therefore, this utility model is not limited to the specific embodiments disclosed herein, but includes all embodiments falling within the protection scope of the claims.

Claims

1. A closed-type intelligent fuse detection device, characterized in that, include: The MCU includes a current detection circuit, a temperature detection circuit, and a status detection circuit electrically connected to it. The MCU controls the current detection circuit, the temperature detection circuit, and the status detection circuit. The current detection circuit monitors the current of the device in real time. The temperature detection circuit detects the operating temperature of the device in real time to provide a reference for the control of the MCU. The status detection circuit monitors the operating status of the fuse.

2. The closed-type intelligent fuse detection device according to claim 1, characterized in that, The MCU includes any one of the STM32F103C series and GD32F103.

3. The closed-type intelligent fuse detection device according to claim 1, characterized in that, The current detection circuit includes: pin 1 of the energy metering chip U3 is connected to one end of resistor R23 and one end of capacitor C11; pin 2 of the energy metering chip U3 is connected to one end of capacitor C12 and one end of resistor R21; pin 3 of the energy metering chip U3 is connected to one end of resistor R12 and one end of capacitor C13; pin 4 of the energy metering chip U3 is connected to one end of capacitor C14 and one end of resistor R13; pin 5 of the energy metering chip U3 is connected to one end of capacitor C15, one end of resistor R19, and one end of resistor R18; pin 6 of the energy metering chip U3 is connected to one end of capacitor C16 and grounded; and pin 16 of the energy metering chip U3 is connected to one end of capacitor C17 and connected to a 3.3V voltage. The other end of capacitor C11 is connected to the other end of capacitor C12. The other end of resistor R23 is connected to one end of load CR1. The other end of load CR1 is connected to one end of relay K1. The other end of relay K1 is connected to pin 1 of current transformer TA1. The other end of capacitor C13 is connected to the other end of capacitor C14. The other end of resistor R12 is connected to pin 4 of current transformer TA1 and one end of resistor R11. The other end of resistor R11 is grounded. The other end of resistor R13 is connected to pin 3 of current transformer TA1. The other end of resistor R19 is connected to the other end of capacitor C15. Resistor R18 is connected in series with resistors R17, R16, R15, and R14. One end of resistor R14 is connected to AC-DC.

4. The closed-type intelligent fuse detection device according to claim 1, characterized in that, The temperature detection circuit includes a temperature sensor, a signal amplification circuit, and an analog-to-digital converter that are electrically connected.

5. The closed-type intelligent fuse detection device according to claim 1, characterized in that, The state detection circuit includes: pin 4 of rectifier bridge DB1 is connected to the anode of diode D1, the anode of diode D2, and the cathode of diode D3 respectively; pin 3 of rectifier bridge DB1 is grounded; the cathode of diode D1 is connected to one end of resistor R1 and the source of transistor Q1 respectively; the drain of transistor Q1 is connected to one end of capacitor C1; the gate of transistor Q1 is connected to the other end of resistor R1 and the drain of transistor Q2 respectively; the source of transistor Q2 is grounded; and the gate of transistor Q2 is connected to the output terminal of battery voltage detection chip U1, one end of resistor R6, and resistor R5 respectively. One end of resistor R5 is connected to the input terminal of battery voltage detection chip U1, one end of resistor R2, and one end of resistor R3. The other end of resistor R2 is connected to the negative terminal of diode D2 and one end of capacitor C2. The other end of resistor R3 is connected to the other end of capacitor C2 and the positive terminal of diode D3 and grounded. The other end of resistor R6 is connected to one end of capacitor C4 and the input terminal of battery voltage detection chip U2. The other end of capacitor C4 is grounded. The output terminal of battery voltage detection chip U2 is connected to the positive terminal of diode D4 and one end of resistor R4.

6. The closed-type intelligent fuse detection device according to claim 3, characterized in that, The power metering chip U3 includes one of the following: HLW8112, CSE7761, R5F10Y series, STMicroelectronics' STPM series, MSP430 series, and PIC24FJ128GA310 series.

7. The closed-type intelligent fuse detection device according to claim 4, characterized in that, The signal amplification circuit includes a signal amplification chip U4, which is connected to the temperature sensor.

8. The closed-type intelligent fuse detection device according to claim 4, characterized in that, The temperature detection circuit also includes a display and alarm circuit.

9. The closed-type intelligent fuse detection device according to claim 7, characterized in that, The signal amplification chip U4 includes any one of the following: LM1875, LM3886, LM4766, LM358, LM324, LM393, LM339, LM386 and AG50.

10. The closed-type intelligent fuse detection device according to claim 8, characterized in that, The display and alarm circuit includes an LED display screen, a sound generator, and a flashlight, which are electrically connected.

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