A safety linkage control device for distribution box

Abstract

The present invention discloses a safety linkage control device for a distribution box, which effectively solves the problem that the hidden dangers brought by the methods provided by the prior art seriously affect the safety of the distribution box. The device described in the present invention includes a detection circuit and a control circuit. The detection circuit uses the arc signal output by the arc detection module to calculate and judge the current signal detected by the current detection module, and then outputs a difference signal to the control circuit. The control circuit calculates the change signal obtained by calculating the difference signal again and calculating the temperature signal detected by the temperature detection module, thereby obtaining a reminder signal and an emergency signal and outputting them to the monitoring module, thereby ensuring the safety of the distribution box.

Description

Technical Field

[0001] The invention relates to the field of distribution box detection, in particular to a safety linkage control device for a distribution box. Background Art

[0002] The distribution box is an important power supply and distribution device, which contains switchgear, measuring instruments, protective electrical appliances, auxiliary equipment and other hardware. It is the terminal link of the power supply and distribution system. It is responsible for distributing electric energy to various construction equipment, displaying the power status, and facilitating power switching operations. It is very important. The measuring instruments are connected to the monitoring module through connecting wires, which will make the connecting wires inside the distribution box more confusing and easily cause faults.

[0003] The prior art provides a safe and intelligent distribution box with application number 202011181499.2, which solves this problem very well. It uses the method of splicing the internal detection modules together to achieve the effect of reducing the connecting wires inside the distribution box, thereby improving the stability and safety of the distribution box, but this method has hidden dangers. First, the monitoring module still needs to continuously receive the data detected by each detection module, and the monitoring module needs to process the data in the order of the received data. If a sudden fault occurs in the distribution box, the monitoring module can only process the data of the sudden fault after processing the received data, resulting in the phenomenon that the fault of the distribution box cannot be discovered in time, which seriously threatens the safety of the distribution box; second, the detection modules in this method rely on the monitoring module to process the data. If the monitoring module has a program runaway or a fault problem, the safety of the distribution box cannot be effectively guaranteed.

[0004] The present invention provides a new solution to solve this problem. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a base station detection and control circuit, which effectively solves the problem that the hidden dangers brought by the method provided by the prior art seriously affect the safety of the distribution box.

[0006] The technical solution is a safety linkage control device for a distribution box, which includes a detection circuit and a control circuit. The detection circuit uses the arc signal output by the arc detection module to calculate and judge the current signal detected by the current detection module, and then outputs a difference signal to the control circuit. The control circuit further judges the difference signal and calculates the change signal obtained by calculating the temperature signal detected by the temperature detection module, thereby obtaining a reminder signal and an emergency signal and outputting them to the monitoring module.

[0007] Furthermore, the detection circuit amplifies the arc signal generated by the arc detection module, and uses the amplified arc signal to subtract the current signal detected by the current detection module to obtain a difference signal, and transmits the difference signal to the monitoring module after judgment.

[0008] Further, the detection circuit includes a resistor R1, one end of the resistor R1 is connected to the arc detection module, the other end of the resistor R1 is connected to the in-phase end of the op amp U2B, the inverting end of the op amp U2B is respectively connected to one end of the resistor R4 and one end of the resistor R3, the other end of the resistor R4 is respectively connected to the output end of the op amp U2B and the positive electrode of the diode D4, the negative electrode of the diode D4 is respectively connected to the control electrode of the thyristor Q5 and one end of the capacitor C1, the anode of the thyristor Q5 is connected to the current detection module, the cathode of the thyristor Q5 is connected to one end of the resistor R6, the other end of the resistor R6 is respectively connected to one end of the resistor R5, one end of the resistor R7, and the in-phase end of the op amp U3B, the inverting end of the op amp U3B is respectively connected to one end of the capacitor C2 and one end of the resistor R8, the output end of the op amp U3B is respectively connected to the other end of the resistor R8, The inverting end of the operational amplifier U5B and the anode of the thyristor Q9, and the output end of the operational amplifier U5B are respectively connected to the positive electrode of the diode D3, one end of the resistor R18, and the base of the transistor Q10; the negative electrode of the diode D3 is respectively connected to the other end of the capacitor C7, the control electrode of the thyristor Q9, the negative electrode of the diode D1, one end of the relay K1, and one end of the capacitor C5; the cathode of the thyristor Q9 is connected to one end of the 2 pin of the switch S1, the other end of the 2 pin of the switch S1 is connected to one end of the 3 pin of the switch S1, the other end of the resistor R18 is connected to the emitter of the transistor Q10 and to the positive polarity power supply VCC, the collector of the transistor Q10 is connected to the positive electrode of the diode D10, and the other end of the capacitor C5 is respectively connected to the other end of the capacitor C2, the other end of the capacitor C1, the other end of the resistor R3, the other end of the relay K1 and to the ground.

[0009] Furthermore, the control circuit includes a judger and a confirmer. The judger again judges the difference signal output by the detection circuit and compares it with the temperature signal detected by the temperature detection module in the confirmer to obtain an emergency signal after performing calculations on the comparison signal, and uses the difference signal to obtain a reminder signal, and outputs the reminder signal and the emergency signal to the monitoring module.

[0010] Further, the judgement device includes a resistor R26, one end of the resistor R26 is connected to the 1 pin of the switch S1 in the detection circuit, the other end of the resistor R26 is respectively connected to one end of the resistor R19 and the inverting end of the operational amplifier U1B, the output end of the operational amplifier U1B is respectively connected to one end of the resistor R10, the base of the transistor Q7, the base of the transistor Q2, the anode of the thyristor Q8, the anode of the thyristor Q6, and the other end of the 3 pin of the switch S1 in the detection circuit, the collector of the transistor Q2 is respectively connected to one end of the resistor R9 and the positive electrode of the diode D5, the other end of the resistor R9 is respectively connected to the other end of the resistor R10, the base of the transistor Q7 The emitter of the transistor Q10 in the detection circuit is connected to the positive polarity power supply VCC, the emitter of the transistor Q2 is connected to one end of the resistor R11, the collector of the transistor Q7 is respectively connected to the positive electrode of the diode D2 and one end of the resistor R12, the cathode of the diode D2 is respectively connected to one end of the capacitor C3 and the control electrode of the thyristor Q8, the cathode of the diode D5 is respectively connected to one end of the capacitor C6 and the control electrode of the thyristor Q6, the other end of the capacitor C3 is respectively connected to the other end of the capacitor C6, the other end of the capacitor C3, the other end of the resistor R11, the other end of the resistor R12, the other end of the relay K1 in the detection circuit and connected to the ground.

[0011] Furthermore, the confirmer includes a resistor R15, one end of which is connected to the cathode of the thyristor Q8 in the judger, the other end of which is connected to one end of the resistor R13 and the base of the transistor Q3, the collector of the transistor Q3 is connected to one end of the resistor R14 and the base of the transistor Q4, the emitter of the transistor Q4 is connected to one end of the resistor R17, one end of the resistor R24 ​​and the negative electrode of the voltage regulator D7, the collector of the transistor Q4 is connected to one end of the resistor R16 and one end of the resistor R22, respectively. , the other end of resistor R17, the other end of resistor R14, the other end of resistor R13, the emitter of transistor Q1, one end of resistor R25, the emitter of transistor Q7 in the judger, the emitter of transistor Q10 in the detection circuit and connected to the positive polarity power supply VCC, the other end of resistor R24 ​​is connected to pin 1 of AND gate U3A, pin 16 of AND gate U3A is connected to one end of capacitor C4, the other end of capacitor C4 is connected to one end of resistor R21, and the other end of resistor R21 is connected to the collector of transistor Q1. The base of transistor Q1 is connected to the other end of resistor R25, the output end of op amp U4B, and the positive electrode of diode D6 respectively. The inverse phase of op amp U4B is connected to one end of resistor R20. The other end of resistor R20 is connected to the standard temperature signal. The inverting end of op amp U4B is connected to one end of resistor R27. The other end of resistor R27 is connected to the temperature detection module. The cathode of diode D6 is connected to the cathode of diode D8. The positive electrode of diode D8 is connected to the positive electrode of diode D9 and the positive electrode of diode D10 respectively. , the other end of the resistor R22, the cathode of the diode D9 is connected to the cathode of the thyristor Q6 in the judgement, the cathode of the diode D10 is respectively connected to one end of the resistor R23 and the in-phase end of the operational amplifier U6B, the inverting end of the operational amplifier U6B is respectively connected to the output end of the operational amplifier U6B and the monitoring module, the other end of the resistor R23 is connected to the output end of the AND gate U3A, the positive electrode of the voltage regulator D7 is respectively connected to the emitter of the transistor Q3, the other end of the capacitor C3 in the judgement, the other end of the relay K1 in the detection circuit and connected to the ground.

[0012] The present invention achieves the following beneficial effects:

[0013] By combining the detection circuit and the control circuit to calculate and process the current detection module, the arc detection module and the temperature detection module, the amount of data received by the monitoring module is reduced, and the monitoring module can consider that the distribution box needs maintenance when receiving the data, thereby reducing the workload of the monitoring module. At the same time, the switch operation module is mobilized to realize the linkage of the current detection module, the arc detection module, the temperature detection module and the switch operation module in the distribution box, thereby avoiding the situation where the monitoring module cannot monitor the distribution box in time and cannot use the switch operation module to perform corresponding operations when a fault occurs, thereby avoiding the problem of being unable to ensure the safety of the distribution box. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the detection circuit of the present invention.

[0015] Figure 2 Schematic diagram of the control circuit of the present invention. DETAILED DESCRIPTION

[0016] For the above and other technical contents, features and effects of the present invention, please refer to the following attached Figure 1-2 The detailed description of the embodiments will clearly show that the structural contents mentioned in the following embodiments are all based on the drawings in the specification.

[0017] Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0018] A safety linkage control device for a distribution box, the device comprising a detection circuit and a control circuit, the detection circuit using the arc signal output by the arc detection module to calculate and judge the current signal detected by the current detection module, and then output a difference signal to the control circuit, the control circuit again judges the difference signal and calculates the change signal obtained by calculating the temperature signal detected by the temperature detection module, thereby obtaining a reminder signal and an emergency signal and outputting them to a monitoring module.

[0019] The detection circuit includes a resistor R1, one end of which is connected to the arc detection module, the other end of which is connected to the in-phase end of the op amp U2B, the inverting end of the op amp U2B is respectively connected to one end of a resistor R4 and one end of a resistor R3, the other end of which is respectively connected to the output end of the op amp U2B and the positive electrode of a diode D4, the negative electrode of the diode D4 is respectively connected to the control electrode of a thyristor Q5 and one end of a capacitor C1, the anode of the thyristor Q5 is connected to the current detection module, the cathode of the thyristor Q5 is connected to one end of a resistor R6, the other end of which is respectively connected to one end of a resistor R5, one end of a resistor R7 and the in-phase end of the op amp U3B, the inverting end of the op amp U3B is respectively connected to one end of a capacitor C2 and one end of a resistor R8, the output end of the op amp U3B is respectively connected to the other end of the resistor R8 and the op amp The inverting end of the amplifier U5B and the anode of the thyristor Q9, the output end of the operational amplifier U5B is respectively connected to the positive electrode of the diode D3, one end of the resistor R18, and the base of the transistor Q10, the negative electrode of the diode D3 is respectively connected to the other end of the capacitor C7, the control electrode of the thyristor Q9, the negative electrode of the diode D1, one end of the relay K1, and one end of the capacitor C5, the cathode of the thyristor Q9 is connected to one end of the 2 pin of the switch S1, the other end of the 2 pin of the switch S1 is connected to one end of the 3 pin of the switch S1, the other end of the resistor R18 is connected to the emitter of the transistor Q10 and connected to the positive polarity power supply VCC, the collector of the transistor Q10 is connected to the positive electrode of the diode D10, the other end of the capacitor C5 is respectively connected to the other end of the capacitor C2, the other end of the capacitor C1, the other end of the resistor R3, the other end of the relay K1 and connected to the ground;

[0020] The detection circuit transmits the arc signal detected by the arc detection module to the operational amplifier U2B for amplification using resistor R1, so as to avoid the problem that the arc signal is relatively weak when a small arc appears in the distribution box, and the line loss cannot be transmitted to the monitoring module. The amplified arc signal uses diode D4 and capacitor C1 to turn on thyristor Q5. Thyristor Q5 then transmits the current signal of the distribution box detected by the current detection module to the operational amplifier U3B through resistor R6 in two ways, one of which is directly transmitted to the in-phase end of the operational amplifier U3B, and the other is transmitted to the inverting end of the operational amplifier U3B after delay through resistor R5 and capacitor C2. The operational amplifier U3B subtracts the two current signals to output a difference signal, which represents the current change in the distribution box when the arc appears, and transmits the difference signal to the operational amplifier U5B for Zero-crossing comparison, that is, detecting whether the difference signal is positive or negative. When the difference signal turns on the diode D3, it indicates that the current in the distribution box is in an increasing state, that is, the difference signal is positive at this time. At this time, the diode D3 turns on the thyristor Q9 through the capacitor C7, and the thyristor Q9 transmits the difference signal to the control circuit through the 2nd and 3rd pins of the switch S1. If the difference signal turns on the transistor Q10, it indicates that the current in the distribution box is in a decreasing state, that is, the difference signal is negative at this time. At this time, the transistor Q10 turns on the relay K1 through the diode D1, and the relay K1 disconnects the 2nd pin of the switch S1 from the 3rd pin and connects it to the 1st pin, and turns on the thyristor Q9 through the diode D1 and the capacitor C5. At this time, the thyristor Q9 transmits the difference signal to the control circuit through the 2nd and 1st pins of the switch S1.

[0021] The judgement device includes a resistor R26, one end of which is connected to pin 1 of switch S1 in the detection circuit, and the other end of which is respectively connected to one end of resistor R19 and the inverting end of op amp U1B, the output end of op amp U1B is respectively connected to one end of resistor R10, the base of transistor Q7, the base of transistor Q2, the anode of thyristor Q8, the anode of thyristor Q6, and the other end of pin 3 of switch S1 in the detection circuit, the collector of transistor Q2 is respectively connected to one end of resistor R9 and the positive electrode of diode D5, the other end of resistor R9 is respectively connected to the other end of resistor R10, the base of transistor Q7, the positive electrode of diode D6, and the collector of transistor Q2. The emitter of the transistor Q10 in the detection circuit is connected to the positive polarity power supply VCC, the emitter of the transistor Q2 is connected to one end of the resistor R11, the collector of the transistor Q7 is respectively connected to the positive electrode of the diode D2 and one end of the resistor R12, the cathode of the diode D2 is respectively connected to one end of the capacitor C3 and the control electrode of the thyristor Q8, the cathode of the diode D5 is respectively connected to one end of the capacitor C6 and the control electrode of the thyristor Q6, the other end of the capacitor C3 is respectively connected to the other end of the capacitor C6, the other end of the capacitor C3, the other end of the resistor R11, the other end of the resistor R12, the other end of the relay K1 in the detection circuit and connected to the ground;

[0022] The confirmer includes a resistor R15, one end of which is connected to the cathode of the thyristor Q8 in the judger, the other end of which is respectively connected to one end of the resistor R13 and the base of the transistor Q3, the collector of the transistor Q3 is respectively connected to one end of the resistor R14 and the base of the transistor Q4, the emitter of the transistor Q4 is respectively connected to one end of the resistor R17, one end of the resistor R24 ​​and the negative electrode of the voltage regulator tube D7, the collector of the transistor Q4 is respectively connected to one end of the resistor R16, one end of the resistor R22 and the negative electrode of the resistor R The other end of 17, the other end of resistor R14, the other end of resistor R13, the emitter of transistor Q1, one end of resistor R25, the emitter of transistor Q7 in the judger, and the emitter of transistor Q10 in the detection circuit are connected to the positive polarity power supply VCC, the other end of resistor R24 ​​is connected to pin 1 of AND gate U3A, the pin 16 of AND gate U3A is connected to one end of capacitor C4, the other end of capacitor C4 is connected to one end of resistor R21, and the other end of resistor R21 is connected to the collector of transistor Q1. The base of transistor Q1 is connected to the other end of resistor R25, the output end of op amp U4B, and the positive electrode of diode D6 respectively. The inverse phase of op amp U4B is connected to one end of resistor R20. The other end of resistor R20 is connected to the standard temperature signal. The inverting end of op amp U4B is connected to one end of resistor R27. The other end of resistor R27 is connected to the temperature detection module. The cathode of diode D6 is connected to the cathode of diode D8. The anode of diode D8 is connected to the anode of diode D9, the anode of diode D10, and the positive electrode of diode D9 respectively. The other end of resistor R22, the cathode of diode D9 is connected to the cathode of thyristor Q6 in the judgement, the cathode of diode D10 is respectively connected to one end of resistor R23 and the in-phase end of op amp U6B, the inverting end of op amp U6B is respectively connected to the output end of op amp U6B and the monitoring module, the other end of resistor R23 is connected to the output end of AND gate U3A, the positive pole of voltage regulator D7 is respectively connected to the emitter of transistor Q3, the other end of capacitor C3 in the judgement, the other end of relay K1 in the detection circuit and connected to ground.

[0023] The control circuit includes a judger and a confirmer. The judger uses a resistor R26 to receive a difference signal transmitted from the 2nd pin and the 1st pin of the switch S1 in the detection circuit, and inverts the difference signal through the operational amplifier U1B, converts the difference signal from a negative state to a positive state, and uses transistors Q7 and Q2 to re-judge the positive difference signal. When the difference signal turns on the transistor Q7, it indicates that the current in the distribution box has not changed significantly, that is, the current in the distribution box is still in a safe state. At this time, the transistor Q7 turns on the thyristor Q8 through the diode D2 and the capacitor C3, and the thyristor Q8 transmits the difference signal to the confirmer. When the difference signal turns on the transistor Q2 If the voltage is turned on, it indicates that the current in the distribution box has changed significantly and the safety of the distribution box has been affected. At this time, the transistor Q2 turns on the thyristor Q6 through the diode D5 and the capacitor C6, and the thyristor Q6 transmits the difference signal to the confirmer. When the resistor R15 in the confirmer receives the difference signal transmitted from the thyristor Q8 in the judger, the resistor R15 transmits the difference signal to the transistor Q3 and the transistor Q4 for amplification, and uses the voltage regulator D7 to stabilize the difference signal within the voltage regulation range of the voltage regulator D7. The confirmer also detects the temperature signal of the part where the arc occurs in the distribution box by the temperature detection module, and the temperature signal is transmitted to the operational amplifier U4B using the resistor R27 and the standard temperature signal transmitted by the resistor R20. The temperature signal is compared with the standard temperature signal, where the standard temperature signal is the detected temperature signal in the distribution box at this time. The operational amplifier U4B outputs a comparison signal. When the comparison signal turns on the transistor Q1, it indicates that the temperature of the arc-occurring part of the distribution box has not changed significantly. At this time, the transistor Q1 outputs the first high level to the AND gate U3A through the resistor R21 and the capacitor C4. The AND gate U3A performs an AND operation on the difference signal and the first high level, so that the AND gate U3A outputs a reminder signal. The reminder signal is output to the monitoring module through the operational amplifier U6B. The monitoring module reminds the distribution box to perform simple maintenance through the display module. If the confirmer receives the difference signal transmitted from the thyristor Q6, the difference signal will turn on the diode D9 is turned on, and at the same time, the diode D6 in the confirmer is turned on by the comparison signal output by the operational amplifier U4B, then the AND gate circuit composed of the diode D9, the diode D8, and the resistor R22 is turned on, and the AND gate circuit performs an AND operation on the difference signal and the comparison signal and outputs an emergency signal. The emergency signal turns on the switch operation module, and the switch operation module performs corresponding operations on the distribution box, and the emergency signal is output to the monitoring module through the diode D10 and the operational amplifier U6B. The monitoring module notifies the distribution box through the display module that emergency maintenance is required at this time, and the data detected by the current detection module, the temperature detection module, and the arc detection module are converted into analog current signals, temperature signals, and arc signals respectively through the A / D converter.

[0024] When the present invention is in use, the detection circuit transmits the arc signal detected by the arc detection module to the operational amplifier U2B by using the resistor R1 for amplification. The amplified arc signal uses the diode D4 and the capacitor C1 to turn on the thyristor Q5. The thyristor Q5 then transmits the current signal of the distribution box detected by the current detection module to the operational amplifier U3B in two ways through the resistor R6. The operational amplifier U3B performs a subtraction operation on the two current signals, thereby outputting a difference signal, and transmits the difference signal to the operational amplifier U5B for zero-crossing comparison. When the difference signal turns on the diode D3, the diode D3 turns on the thyristor Q9 through the capacitor C7, and the thyristor Q9 transmits the difference signal to the control circuit through the 2nd and 3rd pins of the switch S1. On, if the difference signal turns on the transistor Q10, the transistor Q10 turns on the relay K1 through the diode D1, and the relay K1 disconnects the 2nd pin of the switch S1 from the 3rd pin and connects to the 1st pin, and turns on the thyristor Q9 through the diode D1 and the capacitor C5, and the thyristor Q9 transmits the difference signal to the control circuit through the 2nd pin and the 1st pin of the switch S1. The control circuit includes a judge and a confirmer, and the judge uses the resistor R26 to receive the difference signal transmitted from the 2nd pin and the 1st pin of the switch S1 in the detection circuit, and inverts the difference signal through the operational amplifier U1B, and uses the transistor Q7 and the transistor Q2 to judge the positive difference signal again. When the difference signal is When the transistor Q7 is turned on, the transistor Q7 turns on the thyristor Q8 through the diode D2 and the capacitor C3, and the thyristor Q8 transmits the difference signal to the confirmer. When the difference signal turns on the transistor Q2, the transistor Q2 turns on the thyristor Q6 through the diode D5 and the capacitor C6, and the thyristor Q6 transmits the difference signal to the confirmer. When the resistor R15 in the confirmer receives the difference signal transmitted from the thyristor Q8 in the judger, the resistor R15 transmits the difference signal to the transistor Q3 and the transistor Q4 for amplification, and uses the voltage regulator D7 to stabilize the difference signal. The confirmer also compares the temperature signal with the standard temperature signal using the operational amplifier U4B, and the operational amplifier U4B outputs a comparison signal. When the comparison signal When the signal turns on the transistor Q1, the transistor Q1 outputs the first high level to the AND gate U3A through the resistor R21 and the capacitor C4. The AND gate U3A performs an AND operation on the difference signal and the first high level, so that the AND gate U3A outputs a reminder signal. The reminder signal is output to the monitoring module through the operational amplifier U6B. The monitoring module reminds the user to perform simple maintenance on the distribution box through the display module. If the confirmer receives the difference signal transmitted from the thyristor Q6, the difference signal turns on the diode D9. At the same time, the diode D6 in the confirmer is turned on by the comparison signal output by the operational amplifier U4B. Then, the AND gate circuit composed of the diode D9, the diode D8 and the resistor R22 is turned on. The AND gate circuit performs an AND operation on the difference signal and the comparison signal and outputs an emergency signal.The emergency signal turns on the switch operation module, and the emergency signal is output to the monitoring module through the diode D10 and the op amp U6B. The monitoring module notifies through the display module that the distribution box needs emergency maintenance at this time.

[0025] The present invention achieves the following effects:

[0026] (1) By combining the detection circuit and the control circuit to calculate and process the current detection module, the arc detection module and the temperature detection module, the amount of data received by the monitoring module is reduced, and the monitoring module can determine that the distribution box needs maintenance when receiving the data, that is, the workload of the monitoring module is reduced. At the same time, the switch operation module is mobilized to realize the linkage of the current detection module, the arc detection module, the temperature detection module and the switch operation module in the distribution box, thereby avoiding the monitoring module being unable to timely monitor the distribution box when a fault occurs and being unable to use the switch operation module to perform corresponding operations, thereby avoiding the problem of being unable to ensure the safety of the distribution box;

[0027] (2) A detection circuit is set up to calculate and judge the current signal and arc signal detected by the current detection module and the arc detection module, so as to judge the state change in the distribution box, and accurately judge the change of the state of the current in the distribution box through the judgement in the control circuit, and use the current signal detected by the temperature detection module in the confirmer to improve the accuracy of the judgment of the detection circuit and the control circuit, thereby correspondingly improving the safety of the distribution box, effectively reducing the dependence of the current detection module, the arc detection module, and the temperature detection module on the monitoring module, and avoiding the problem that the safety of the distribution box is not guaranteed when the monitoring module has a program runaway or other faults.

Claims

1. A safety linkage control device for a distribution box, characterized in that: The device includes a detection circuit and a control circuit. The detection circuit uses the arc signal output by the arc detection module to calculate and judge the current signal detected by the current detection module, and then outputs a difference signal to the control circuit. The control circuit calculates the change signal obtained by calculating the difference signal again and the temperature signal detected by the temperature detection module, thereby obtaining a reminder signal and an emergency signal and outputting them to the monitoring module. The detection circuit amplifies the arc signal generated by the arc detection module, and uses the amplified arc signal to subtract the current signal detected by the current detection module to obtain a difference signal, and transmits the difference signal to the monitoring module after judgment; The detection circuit includes a resistor R1, one end of the resistor R1 is connected to the arc detection module, the other end of the resistor R1 is connected to the in-phase end of the operational amplifier U2B, the inverting end of the operational amplifier U2B is respectively connected to one end of the resistor R4 and one end of the resistor R3, the other end of the resistor R4 is respectively connected to the output end of the operational amplifier U2B and the positive electrode of the diode D4, the negative electrode of the diode D4 is respectively connected to the control electrode of the thyristor Q5 and one end of the capacitor C1, the anode of the thyristor Q5 is connected to the current detection module, the cathode of the thyristor Q5 is connected to one end of the resistor R6, the other end of the resistor R6 is respectively connected to one end of the resistor R5, one end of the resistor R7, and the in-phase end of the operational amplifier U3B, the inverting end of the operational amplifier U3B is respectively connected to one end of the capacitor C2 and one end of the resistor R8, the output end of the operational amplifier U3B is respectively connected to the other end of the resistor R8 and the operational amplifier U5 The inverting end of B and the anode of thyristor Q9, the output end of operational amplifier U5B are respectively connected to the positive electrode of diode D3, one end of resistor R18, and the base of transistor Q10, the negative electrode of diode D3 is respectively connected to the other end of capacitor C7, the control electrode of thyristor Q9, the negative electrode of diode D1, one end of relay K1, and one end of capacitor C5, the cathode of thyristor Q9 is connected to one end of pin 2 of switch S1, the other end of pin 2 of switch S1 is connected to one end of pin 3 of switch S1, the other end of resistor R18 is connected to the emitter of transistor Q10 and connected to the positive polarity power supply VCC, the collector of transistor Q10 is connected to the positive electrode of diode D10, the other end of capacitor C5 is respectively connected to the other end of capacitor C2, the other end of capacitor C1, the other end of resistor R3, the other end of relay K1 and connected to ground.

2. A distribution box safety linkage control device as claimed in claim 1, characterized in that: The control circuit includes a judger and a confirmer. The judger judges the difference signal output by the detection circuit again and compares it with the temperature signal detected by the temperature detection module in the confirmer to obtain an emergency signal after calculating the comparison signal, and uses the difference signal to obtain a reminder signal, and outputs the reminder signal and the emergency signal to the monitoring module.

3. A distribution box safety linkage control device as claimed in claim 2, characterized in that: The judgement device includes a resistor R26, one end of which is connected to pin 1 of switch S1 in the detection circuit, and the other end of which is respectively connected to one end of resistor R19 and the inverting end of op amp U1B, the output end of op amp U1B is respectively connected to one end of resistor R10, the base of transistor Q7, the base of transistor Q2, the anode of thyristor Q8, the anode of thyristor Q6, and the other end of pin 3 of switch S1 in the detection circuit, the collector of transistor Q2 is respectively connected to one end of resistor R9 and the positive electrode of diode D5, the other end of resistor R9 is respectively connected to the other end of resistor R10, the base of transistor Q7, the positive electrode of diode D6, and the collector of transistor Q2. The emitter of the transistor Q2 is connected to one end of the resistor R11, the collector of the transistor Q7 is connected to the positive electrode of the diode D2 and one end of the resistor R12, the cathode of the diode D2 is connected to one end of the capacitor C3 and the control electrode of the thyristor Q8, the cathode of the diode D5 is connected to one end of the capacitor C6 and the control electrode of the thyristor Q6, the other end of the capacitor C3 is connected to the other end of the capacitor C6, the other end of the capacitor C3, the other end of the resistor R11, the other end of the resistor R12, the other end of the relay K1 in the detection circuit and the ground.

4. A distribution box safety linkage control device as claimed in claim 2, characterized in that: The confirmer includes a resistor R15, one end of which is connected to the cathode of the thyristor Q8 in the judger, the other end of which is respectively connected to one end of the resistor R13 and the base of the transistor Q3, the collector of the transistor Q3 is respectively connected to one end of the resistor R14 and the base of the transistor Q4, the emitter of the transistor Q4 is respectively connected to one end of the resistor R17, one end of the resistor R24 ​​and the negative electrode of the voltage regulator D7, the collector of the transistor Q4 is respectively connected to one end of the resistor R16, one end of the resistor R22 and the negative electrode of the resistor R17. The other end of resistor R7, the other end of resistor R14, the other end of resistor R13, the emitter of transistor Q1, one end of resistor R25, the emitter of transistor Q7 in the judger, and the emitter of transistor Q10 in the detection circuit are connected to the positive polarity power supply VCC, the other end of resistor R24 ​​is connected to pin 1 of AND gate U3A, pin 16 of AND gate U3A is connected to one end of capacitor C4, the other end of capacitor C4 is connected to one end of resistor R21, and the other end of resistor R21 is connected to the collector of transistor Q1. The base of transistor Q1 is respectively connected to the other end of resistor R25, the output end of op amp U4B, and the positive electrode of diode D6. The inverse phase of op amp U4B is connected to one end of resistor R20. The other end of resistor R20 is connected to the standard temperature signal. The inverting end of op amp U4B is connected to one end of resistor R27. The other end of resistor R27 is connected to the temperature detection module. The cathode of diode D6 is connected to the cathode of diode D8. The anode of diode D8 is respectively connected to the anode of diode D9, the anode of diode D10, and the positive electrode of diode D11. The other end of resistor R22, the cathode of diode D9 is connected to the cathode of thyristor Q6 in the judgement, the cathode of diode D10 is respectively connected to one end of resistor R23 and the in-phase end of op amp U6B, the inverting end of op amp U6B is respectively connected to the output end of op amp U6B and the monitoring module, the other end of resistor R23 is connected to the output end of AND gate U3A, the positive pole of voltage regulator D7 is respectively connected to the emitter of transistor Q3, the other end of capacitor C3 in the judgement, the other end of relay K1 in the detection circuit and connected to ground.

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