Electrical fireproof current-limiting protector

Abstract

The utility model belongs to the technical field of protectors, and relates to an electrical fireproof current-limiting protector, which comprises an MCU (Microprogrammed Control Unit), and a key circuit, an LED (Light Emitting Diode) circuit, a power supply circuit, an alarm circuit, a voltage stabilizing circuit, a voltage comparison circuit and a master control switch circuit which are electrically connected with the MCU, the MCU is used for controlling the key circuit, the LED circuit and the master control switch circuit, and the power supply circuit is electrically connected with the MCU. The button circuit is used for button control, the LED circuit is used for sound and light alarm, the power supply circuit is used for supplying power to the MCU, the alarm circuit is used for alarming, the voltage stabilizing circuit is used for stabilizing the voltage of the electrical fireproof current-limiting protector, the voltage comparison circuit is used for comparing the voltage, and the alarm circuit is used for giving an alarm. And the master control switch circuit is used for controlling the on-off of the electrical fireproof current-limiting protector. Electrical fire accidents can be obviously reduced, and the safety of personnel and property in a using place is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of protectors, and more specifically, to an electrical fire prevention current-limiting protector. Background Art

[0002] The electrical fire prevention current-limiting protector is a new type of lightning protection device that uses the principle of a metal oxide lightning arrester to limit the current to a safe range. The current-limiting overvoltage protector consists of two parts, namely: a current-limiting resistor on the power supply side and a discharge gap on the load side. When a lightning wave invades, due to the characteristics of the lightning wave such as large energy, high speed, and extremely strong impact, it will cause a very high overvoltage or instantaneous short-circuit fault to the protected equipment; at the same time, a large amount of heat energy and electromagnetic radiation energy will be generated and transmitted to the surrounding environment when the lightning wave invades. And the energy discharged through the grounding system is limited.

[0003] If the transient pulse current flowing through the equipment is very large at this time, it will cause the insulation of the equipment to break down and be damaged, and even cause a fire and explosion accident; if the transient pulse current flowing through the equipment is very small or there is no transient pulse current passing through at this time, it will also cause the equipment to lose its normal use function due to insufficient overvoltage and even cause a safety accident.

[0004] The existing electrical fire prevention current-limiting protectors lack fast response ability and real-time current-limiting function, are limited to after-the-fact alarm, have a short lifespan and poor reliability, and the contact arcing poses a fire hazard. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is that the existing electrical fire prevention current-limiting protectors lack fast response ability and real-time current-limiting function, are limited to after-the-fact alarm, have a short lifespan and poor reliability, and the contact arcing poses a fire hazard. In view of the above-mentioned defects of the prior art, an electrical fire prevention current-limiting protector is provided, including:

[0006] An MCU, a key circuit, an LED circuit, a power supply circuit, an alarm circuit, a voltage stabilization circuit, a voltage comparison circuit, and a main control switch circuit electrically connected to the MCU. The MCU is used to control the key circuit, the LED circuit, and the main control switch circuit. The key circuit is used for key control. The LED circuit is used for acoustic and optical alarm. The power supply circuit is used to supply power to the MCU. The alarm circuit is used for alarm. The voltage stabilization circuit is used to stabilize the voltage of the electrical fire prevention current-limiting protector. The voltage comparison circuit is used to compare voltages. The main control switch circuit is used to control the switch of the electrical fire prevention current-limiting protector.

[0007] Preferably, the key circuit includes: one end of switch SW101 is connected to one end of switch SW102, one end of switch SW103, and one end of resistor R107 respectively; one end of switch SW105 is connected to one end of switch SW104 and one end of resistor R108 respectively; the other end of switch SW101 is connected to the positive pole of diode D102; the other end of switch SW102 is connected to the other end of switch SW105 and the positive pole of diode D101 respectively; the other end of switch SW103 is connected to the other end of switch SW104 and grounded; the other end of resistor R107 is connected to the other end of resistor R108 and one end of resistor R109 respectively; the negative pole of diode D101 is connected to the other end of resistor R109.

[0008] Preferably, the LED circuit includes: one end of resistor RJ104 is connected to the negative pole of light-emitting diode D1, the positive pole of light-emitting diode D2, and the positive pole of light-emitting diode D6 respectively; the positive pole of light-emitting diode D1 is connected to the negative pole of light-emitting diode D2, the positive pole of light-emitting diode D3, and the negative pole of light-emitting diode D4 respectively; one end of resistor RJ105 is connected to the negative pole of light-emitting diode D3, the positive pole of light-emitting diode D4, and the negative pole of light-emitting diode D5 respectively; the positive pole of light-emitting diode D5 is connected to the negative pole of light-emitting diode D6.

[0009] Preferably, the power supply circuit includes: resistor R109, diode D103, and lithium battery BT1 are connected in series.

[0010] Preferably, the alarm circuit includes: one end of resistor R17 is connected to the base of triode Q3; the collector of triode Q3 is connected to one end of speaker LS101; the emitter of triode Q3 is grounded.

[0011] Preferably, the voltage stabilizing circuit includes: the Vin pin of linear voltage regulator VR1 is connected to V33; the Vout pin of linear voltage regulator VR1 is connected to one end of capacitor C201, one end of capacitor C202, one end of capacitor C203, one end of capacitor C204, and pin 2 of interface com1 respectively; the other end of capacitor C201 is connected to the other end of capacitor C202 and grounded; the other end of capacitor C203 is connected to one end of resistor R211; the other end of resistor R211 is connected to the other end of capacitor C204, pin 1 of interface com1, one end of resistor R1, one end of capacitor C205, and the negative pole of diode D104 respectively; the other end of resistor R1 is connected to the other end of capacitor C205, the positive pole of diode D104 and grounded.

[0012] Preferably, the voltage comparison circuit includes: one end of a resistor R6 is connected to pin 5 of a voltage comparator IC U201B and one end of a resistor R7 respectively; the other end of the resistor R7 is connected to pin 6 of a voltage comparator IC U201A and one end of a resistor R8 respectively; the other end of the resistor R8 is grounded; pin 6 of the voltage comparator IC U201B is connected to pin 5 of the voltage comparator IC U201A; and pin 7 of the voltage comparator IC U201B is connected to pin 7 of the voltage comparator IC U201A.

[0013] Preferably, the main control switch circuit includes: one end of a resistor R17 is connected to the base of a triode Q5, and the emitter of the triode Q5 is grounded.

[0014] Preferably, the MCU includes one of a single-chip microcomputer of the AT32F415 series, a single-chip microcomputer of the 51 series, a single-chip microcomputer of the PIC series, a single-chip microcomputer of the AVR series, a single-chip microcomputer of the ARM series, a single-chip microcomputer of the MIPS series, and a single-chip microcomputer of the PPC series.

[0015] Preferably, the MCU is a single-chip microcomputer of the AT32F415 series.

[0016] Implementing the electrical fire prevention current-limiting protector of the present utility model has the following beneficial effects: By setting an MCU, a key circuit, an LED circuit, a power supply circuit, an alarm circuit, a voltage stabilization circuit, a voltage comparison circuit, and a main control switch circuit that are electrically connected to the MCU, the MCU is used to control the key circuit, the LED circuit, and the main control switch circuit; the key circuit is used for key control; the LED circuit is used for sound and light alarm; the power supply circuit is used to supply power to the MCU; the alarm circuit is used for alarm; the voltage stabilization circuit is used to stabilize the voltage of the electrical fire prevention current-limiting protector; the voltage comparison circuit is used to compare voltages; and the main control switch circuit is used to control the switch of the electrical fire prevention current-limiting protector. It can effectively overcome the disadvantages of traditional circuit breakers, air switches, and monitoring devices, such as large short-circuit current, long time to cut off the short-circuit current, large arc sparks generated during short circuits, and short service life. When a short-circuit fault occurs, it can quickly limit the short-circuit current at the microsecond level to achieve arc extinguishing protection, thereby significantly reducing electrical fire accidents and ensuring the safety of personnel and property in the use place. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0018] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments. In the drawings:

[0019] Figure 1 is a schematic structural diagram of the electrical fire prevention current-limiting protector of the present utility model;

[0020] Figure 2 is a circuit diagram of the key circuit of the electrical fire prevention current-limiting protector of the present utility model;

[0021] Figure 3 is a circuit diagram of the LED circuit of the electrical fire prevention current-limiting protector of the present utility model;

[0022] Figure 4 is a circuit diagram of the power supply circuit of the electrical fire prevention current-limiting protector of the present utility model;

[0023] Figure 5 is a circuit diagram of the alarm circuit of the electrical fire prevention current-limiting protector of the present utility model;

[0024] Figure 6 is a circuit diagram of the voltage stabilizing circuit of the electrical fire prevention current-limiting protector of the present utility model;

[0025] Figure 7 is a circuit diagram of the voltage comparison circuit of the electrical fire prevention current-limiting protector of the present utility model;

[0026] Figure 8 is a circuit diagram of the main control switch circuit of the electrical fire prevention current-limiting protector of the present utility model;

[0027] Figure 9 is a circuit diagram of the MCU circuit of the electrical fire prevention current-limiting protector of the present utility model. Specific embodiments

[0028] The technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0029] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) involved in the embodiments of the present utility model, then the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, then the directional indications will also change accordingly.

[0030] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, such descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0031] Please refer to Figure 1 , which is a schematic structural diagram of the electrical fire prevention current-limiting protector of the present utility model. As Figure 1 shown, in the electrical fire prevention current-limiting protector provided in the first embodiment of the present utility model, it at least includes an MCU, a key circuit, an LED circuit, a power supply circuit, an alarm circuit, a voltage stabilizing circuit, a voltage comparison circuit, and a main control switch circuit that are electrically connected to the MCU. The MCU is used to control the key circuit, the LED circuit, and the main control switch circuit. The key circuit is used for key control. The LED circuit is used for acoustic and optical alarms. The power supply circuit is used to supply power to the MCU. The alarm circuit is used for alarming. The voltage stabilizing circuit is used to stabilize the voltage of the electrical fire prevention current-limiting protector. The voltage comparison circuit is used to compare voltages. The main control switch circuit is used to control the switch of the electrical fire prevention current-limiting protector.

[0032] Figure 2 is the circuit diagram of the key circuit of the electrical fire prevention current-limiting protector of the present utility model. As Figure 2 shown, the key circuit includes: one end of switch SW101 is respectively connected to one end of switch SW102, one end of switch SW103, and one end of resistor R107. One end of switch SW105 is respectively connected to one end of switch SW104 and one end of resistor R108. The other end of switch SW101 is connected to the positive pole of diode D102. The other end of switch SW102 is respectively connected to the other end of switch SW105 and the positive pole of diode D101. The other end of switch SW103 is connected to the other end of switch SW104 and grounded. The other end of resistor R107 is respectively connected to the other end of resistor R108 and one end of resistor R109. The negative pole of diode D101 is connected to the other end of resistor R109. Through multi-level key management, the key management of the electrical fire prevention current-limiting protector of the present utility model can be realized.

[0033] Figure 3 is the circuit diagram of the LED circuit of the electrical fire prevention current-limiting protector of the present utility model. As Figure 3As shown in the figure, the LED circuit includes: one end of resistor RJ104 is connected to the negative electrode of light-emitting diode D1, the positive electrode of light-emitting diode D2, and the positive electrode of light-emitting diode D6 respectively. The positive electrode of light-emitting diode D1 is connected to the negative electrode of light-emitting diode D2, the positive electrode of light-emitting diode D3, and the negative electrode of light-emitting diode D4 respectively. One end of resistor RJ105 is connected to the negative electrode of light-emitting diode D3, the positive electrode of light-emitting diode D4, and the negative electrode of light-emitting diode D5 respectively. The positive electrode of light-emitting diode D5 is connected to the negative electrode of light-emitting diode D6. A light-emitting diode, simply referred to as an LED, is a commonly used light-emitting device that emits light by the recombination of electrons and holes. The light-emitting diode can efficiently convert electrical energy into light energy. The LED1, LED2, LED3, and LED4 levels of display are realized through the LED circuit.

[0034] Figure 4 It is the circuit diagram of the power supply circuit of the electrical fire prevention current-limiting protector of the present utility model. As Figure 4 shown in the figure, the power supply circuit includes: resistor R109 is connected in series with diode D103 and lithium battery BT1. One end of resistor R109 is connected to a 5V voltage, and one end of lithium battery BT1 is grounded. The diode has forward bias characteristics, reverse bias characteristics, forward bias voltage characteristics, and reverse breakdown characteristics. The diode is a semiconductor device composed of a P-type semiconductor and an N-type semiconductor. It has unidirectional conductivity, that is, it can only conduct electricity when it is forward-biased, and it cannot conduct electricity when it is reverse-biased.

[0035] Figure 5 It is the circuit diagram of the alarm circuit of the electrical fire prevention current-limiting protector of the present utility model. As Figure 5 shown in the figure, the alarm circuit includes: one end of resistor R17 is connected to the base of triode Q3, the collector of triode Q3 is connected to one end of speaker LS101, and the emitter of triode Q3 is grounded. Triode Q3 is selected as S8050. Triode Q3 amplifies the electrical signal, and the speaker LS101 makes a sound to give an alarm.

[0036] Figure 6 It is the circuit diagram of the voltage stabilizing circuit of the electrical fire prevention current-limiting protector of the present utility model. As Figure 6As shown in the figure, the voltage stabilizing circuit includes: the Vin pin of the linear voltage regulator VR1 is connected to V33. The Vout pin of the linear voltage regulator VR1 is respectively connected to one end of capacitor C201, one end of capacitor C202, one end of capacitor C203, one end of capacitor C204, and pin 2 of interface com1. The other end of capacitor C201 is connected to the other end of capacitor C202 and grounded. The other end of capacitor C203 is connected to one end of resistor R211. The other end of resistor R211 is respectively connected to the other end of capacitor C204, pin 1 of interface com1, one end of resistor R1, one end of capacitor C205, and the cathode of diode D104. The other end of resistor R1 is respectively connected to the other end of capacitor C205 and the anode of diode D104 and grounded. In this embodiment, the linear voltage regulator VR1 is selected as LR6206-T18, which has the characteristics of high ripple rejection ratio, low power consumption, and low dropout voltage. It is a CMOS buck voltage regulator with overcurrent and short-circuit protection. It has a very low quiescent bias current (8.0 μA Typ.). They can provide an output current of 300 mA under the condition of a very small voltage difference between the input and output voltages, and still maintain a good regulation rate. Due to the very small voltage difference between the input and output and the very small quiescent bias current, the service life can be extended.

[0037] Figure 7 is the circuit diagram of the voltage comparison circuit of the electrical fire current-limiting protector of the present utility model. As Figure 7As shown in the figure, the voltage comparison circuit includes: one end of resistor R6 is respectively connected to pin 5 of voltage comparator IC U201B and one end of resistor R7; the other end of resistor R7 is respectively connected to pin 6 of voltage comparator IC U201A and one end of resistor R8; the other end of resistor R8 is grounded; pin 6 of voltage comparator IC U201B is connected to pin 5 of voltage comparator IC U201A; pin 7 of voltage comparator IC U201B is connected to pin 7 of voltage comparator IC U201A. In this embodiment, both voltage comparator IC U201B and voltage comparator IC U201A are selected as LMV393TP-SR. LMV393TP-SR provides 8-pin DIP, SO-8 and other packages. LMV393TP-SR contains two independent high-precision comparator operational amplifiers, which can be powered by single power supply or dual power supplies. The power supply voltage range is wide and it can be used in a variety of applications. The maximum output current of LMV393TP-SR is 20 mA, which is sufficient to drive transistors and logic systems. Among them, pin 1: output 1, the output pin of operational amplifier 1; pin 2: inverting input 1, the inverting input pin of operational amplifier 1; pin 3: non-inverting input 1, the non-inverting input pin of operational amplifier 1; pin 4: GND, the grounding pin of the IC, which needs to be connected to the negative (-) terminal of the power supply voltage; pin 5: inverting input 2, the non-inverting input pin of operational amplifier 2; pin 6: non-inverting input 2, the inverting input pin of operational amplifier 2; pin 7: output 2, which is the output pin of operational amplifier 2; pin 8: virtual control center, which is the positive pin of the IC and needs to be connected to the positive (+) terminal of the power supply voltage. When the voltage of pin 2 is higher than that of pin 7, the output voltage remains high level, and vice versa. If the inverting terminal of the IC voltage is higher than the non-inverting terminal, the output device is activated. Similarly, if the inverting terminal voltage of the IC is lower than the non-inverting terminal, the output device is deactivated. Here, an LED is used as the output device in this circuit.

[0038] Figure 8 This is the circuit diagram of the main control switch circuit of the electrical fire prevention current-limiting protector of the present utility model. As Figure 8 shown in the figure, the main control switch circuit includes: one end of resistor R17 is connected to the base of triode Q5, and the emitter of triode Q5 is grounded. In this embodiment, triode Q5 is selected as S8050. Its structure is simple and it is easy to expand the current. At the same time, the main control switch unit composed of high-performance MOSFET tubes is used as a solid-state electronic switch, which fundamentally overcomes the defects of traditional fuses and circuit breakers, and has the advantages of no spark, fast switching speed, long service life and low power consumption.

[0039] Figure 9 This is the circuit diagram of the MCU circuit of the electrical fire prevention current-limiting protector of the present utility model. As Figure 9As shown, the MCU includes but is not limited to one of the single-chip microcomputers of the AT32F415 series, 51 series, PIC series, AVR series, ARM series, MIPS series, and PPC series. In some alternative implementation manners of this embodiment, the MCU is a single-chip microcomputer of the AT32F415 series. In this embodiment, the MCU is selected as AT32F415CBT7. The AT32F415 series value-added USB OTG microcontroller of Artel Technology is equipped with a 32-bit core, a CPU operation speed of up to 150 MHz and a built-in digital signal processor (DSP), supports up to 256 KB of flash memory (Flash) and 32 KB of random access memory (SRAM) at most. The fully upgraded USB 2.0 peripherals include full-speed Device and Host transfer modes, and are equipped with an independent 48 MHz internal oscillator to support the crystal-less design of the USB Device, which can reduce costs and improve product reliability. There are also up to 3 USARTs, 2 UARTs, 2 SPIs (which can be multiplexed I 2 S), 2 I 2C, 1 SDIO and 1 CAN interface (2.0B active), 1 16-bit advanced timer, 5 16-bit general-purpose timers, 2 32-bit general-purpose timers, and a 12-channel DMA controller. At the same time, 2 high-speed rail-to-rail input / output analog voltage comparators are also extended, and a 12-bit 16-channel high-speed ADC with a sampling rate of up to 2M SPS can fully meet the requirements of high-speed data acquisition, mixed-signal processing, and industrial control. Almost all I / O ports can tolerate 5V input signals, and all I / O ports are fast I / O with multiple selectable functions and support for port remapping. The excellent flexibility and ease of use meet various application requirements. The AT32F415 series is equipped with the sLib security library independently developed by Yateli, which can support password protection for a specified range of program areas. Solution providers can burn the core algorithm into this area and provide it to downstream customers for secondary development, strengthening the security, reliability, and convenience of secondary development of the product itself. In addition, the AT32F415 series can configure the 18KB system memory into a general user program and data area at one time, expanding the flexibility of the application program's usage space. The AT32F415 can operate in the industrial temperature range of -40 to 105°C, and to meet diverse memory usage requirements, a series of chips are provided for selection, including 5 package types such as LQFP64 (10×10mm), LQFP64 (7×7mm), LQFP48 (7×7mm), QFN48 (6×6mm), and the mini QFN32 (4×4mm), with its rich on-chip resource allocation, high integration, and high cost-effective market competitiveness.

[0040] The electrical fire prevention current-limiting protector of the present utility model can also achieve current-limiting protection for over-temperature faults inside the machine body, as well as functions such as sound and light alarm, parameter presetting, and remote online monitoring, effectively protecting the safety of the power line. Among them, the remote online monitoring technology can achieve multi-machine network monitoring, can be connected to the fire monitoring platform, can record and store data in real time, and can perform data statistics, query, and traceability.

[0041] The working principle of the present utility model is: when a short-circuit fault occurs, the electrical fire prevention current-limiting protector of the present utility model can achieve fast current-limiting protection at the microsecond level, restricting the rapid rise of the short-circuit current within the range of several times the rated working current, thereby effectively eliminating the electrical sparks caused by the short-circuit current and preventing and reducing the hidden dangers of electrical fires; when an over-current fault occurs, the electrical fire prevention current-limiting protector can also achieve current-limiting protection for the over-current fault. Since the electrical fire prevention current-limiting protector adopts high-speed current detection technology, when the instantaneous current in the electrical line surges due to a short circuit, it can quickly detect and implement current-limiting protection, and its control sensitivity is thousands of times higher than that of ordinary circuit breakers.

[0042] The utility model has the following beneficial effects through the design of the above embodiments: by setting an MCU, a key circuit, an LED circuit, a power supply circuit, an alarm circuit, a voltage stabilizing circuit, a voltage comparison circuit, and a main control switch circuit electrically connected to the MCU, the MCU is used to control the key circuit, the LED circuit, and the main control switch circuit, the key circuit is used for key control, the LED circuit is used for sound and light alarm, the power supply circuit is used to supply power to the MCU, the alarm circuit is used for alarm, the voltage stabilizing circuit is used to stabilize the voltage of the electrical fire-proof current-limiting protector, the voltage comparison circuit is used for voltage comparison, and the main control switch circuit is used to control the switch of the electrical fire-proof current-limiting protector; the utility model can effectively overcome the disadvantages of large short-circuit current, long short-circuit current cut-off time, large arc sparks generated during short circuit, and short service life of traditional circuit breakers, air switches, and monitoring equipment. When a short-circuit fault occurs, the short-circuit current can be quickly limited at a microsecond speed to achieve arc extinguishing protection, thereby significantly reducing electrical fire accidents and ensuring the safety of personnel and property in the use site.

[0043] The present invention is described according to specific embodiments, but those skilled in the art should understand that various changes and equivalent substitutions can be made without departing from the scope of the present invention. In addition, in order to adapt to specific occasions of the present invention technology, many modifications can be made to the present invention without departing from its protection scope. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all embodiments that fall within the scope of protection of the claims.

Claims

1. An electrical fire-proof current-limiting protector, characterized in that: The invention comprises: an MCU, a key circuit, an LED circuit, a power supply circuit, an alarm circuit, a voltage stabilizing circuit, a voltage comparison circuit, and a main control switch circuit electrically connected to the MCU, wherein the MCU is used to control the key circuit, the LED circuit, and the main control switch circuit, the key circuit is used for key control, the LED circuit is used for sound and light alarm, the power supply circuit is used to supply power to the MCU, the alarm circuit is used for alarm, the voltage stabilizing circuit is used to stabilize the voltage of the electrical fire-proof current-limiting protector, the voltage comparison circuit is used to compare the voltage, and the main control switch circuit is used to control the switch of the electrical fire-proof current-limiting protector.

2. The electrical fire-proof current-limiting protector according to claim 1, characterized in that: The key circuit includes: one end of the switch SW101 is respectively connected to one end of the switch SW102, one end of the switch SW103, and one end of the resistor R107; one end of the switch SW105 is respectively connected to one end of the switch SW104 and one end of the resistor R108; the other end of the switch SW101 is connected to the positive electrode of the diode D102; the other end of the switch SW102 is respectively connected to the other end of the switch SW105 and the positive electrode of the diode D101; the other end of the switch SW103 is connected to the other end of the switch SW104 and is grounded; the other end of the resistor R107 is respectively connected to the other end of the resistor R108 and one end of the resistor R109; and the cathode of the diode D101 is connected to the other end of the resistor R109.

3. The electrical fire-proof current-limiting protector according to claim 1, characterized in that: The LED circuit includes: one end of the resistor RJ104 is respectively connected to the cathode of the light-emitting diode D1, the anode of the light-emitting diode D2, and the anode of the light-emitting diode D6; the anode of the light-emitting diode D1 is respectively connected to the cathode of the light-emitting diode D2, the anode of the light-emitting diode D3, and the cathode of the light-emitting diode D4; one end of the resistor RJ105 is respectively connected to the cathode of the light-emitting diode D3, the anode of the light-emitting diode D4, and the cathode of the light-emitting diode D5; the anode of the light-emitting diode D5 is connected to the cathode of the light-emitting diode D6.

4. The electrical fire-proof current-limiting protector according to claim 1, characterized in that: The power supply circuit includes: a resistor R109, a diode D103 and a lithium battery BT1 connected in series.

5. The electrical fire-proof current-limiting protector according to claim 1, characterized in that: The alarm circuit includes: one end of the resistor R17 is connected to the base of the transistor Q3, the collector of the transistor Q3 is connected to one end of the speaker LS101, and the emitter of the transistor Q3 is grounded.

6. The electrical fire-proof current-limiting protector according to claim 1, characterized in that: The voltage stabilization circuit includes: the Vin pin of the linear regulator VR1 is connected to V33, the Vout pin of the linear regulator VR1 is respectively connected to one end of the capacitor C201, one end of the capacitor C202, one end of the capacitor C203, one end of the capacitor C204, and pin 2 of the interface com1, the other end of the capacitor C201 is connected to the other end of the capacitor C202 and is grounded, the other end of the capacitor C203 is connected to one end of the resistor R211, the other end of the resistor R211 is respectively connected to the other end of the capacitor C204, pin 1 of the interface com1, one end of the resistor R1, one end of the capacitor C205, and the negative electrode of the diode D104, and the other end of the resistor R1 is respectively connected to the other end of the capacitor C205 and the positive electrode of the diode D104 and is grounded.

7. The electrical fire-proof current-limiting protector according to claim 1, characterized in that: The voltage comparison circuit includes: one end of resistor R6 is respectively connected to pin 5 of voltage comparator IC U201B and one end of resistor R7, the other end of resistor R7 is respectively connected to pin 6 of voltage comparator IC U201A and one end of resistor R8, the other end of resistor R8 is grounded, pin 6 of voltage comparator IC U201B is connected to pin 5 of voltage comparator IC U201A, and pin 7 of voltage comparator IC U201B is connected to pin 7 of voltage comparator IC U201A.

8. The electrical fire-proof current-limiting protector according to claim 1, characterized in that: The main control switch circuit includes: one end of the resistor R17 is connected to the base of the transistor Q5, and the emitter of the transistor Q5 is grounded.

9. The electrical fire-proof current-limiting protector according to any one of claims 1 to 8, characterized in that: The MCU includes: one of AT32F415 series single-chip microcomputer, 51 series single-chip microcomputer, PIC series single-chip microcomputer, AVR series single-chip microcomputer, ARM series single-chip microcomputer, MIPS series single-chip microcomputer and PPC series single-chip microcomputer.

10. The electrical fire-proof current-limiting protector according to claim 9, characterized in that: The MCU is a AT32F415 series single chip microcomputer.

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