阅读说明：本技术 一种煤矿巷道用的易燃易爆场所照明防爆电源及方法 (Inflammable and explosive place illumination explosion-proof power supply and method for coal mine tunnel ) 是由 石连文 解红霞 成咏华 李建东 张牧琢 于 2020-12-29 设计创作，主要内容包括：本发明涉及一种煤矿巷道用的易燃易爆场所照明防爆电源及方法,属于煤矿巷道照明设备防爆技术领域。技术方案是：电流检测传感器检测照明负载电路电流的状况；根据过载电路强度与持续时间判断出过载以致短路的全过程,控制高速关断电路迅速关断防爆电源对外部供电传输线路及用电设备的供电。本发明电流检测传感器在金属防爆壳体内完成照明负载电路电流的检测,并通过金属防爆壳体内的大功率MOS开关管切断照明电源,整个过程全部在金属防爆壳体内进行,不会在煤矿巷道产生任何电气火花。同时对过载及短路情况进行准确分析和判断,区分过载和短路并及时处理,保证煤炭生产安全有有序进行。(The invention relates to an explosion-proof power supply and an explosion-proof method for lighting in an inflammable and explosive place for a coal mine tunnel, and belongs to the technical field of explosion prevention of lighting equipment of the coal mine tunnel. The technical scheme is as follows: the current detection sensor detects the condition of the current of the lighting load circuit; and judging the whole process of short circuit caused by overload according to the intensity and duration of the overload circuit, and controlling the high-speed turn-off circuit to quickly turn off the power supply of the explosion-proof power supply to an external power supply transmission line and electric equipment. The current detection sensor of the invention completes the detection of the current of the lighting load circuit in the metal explosion-proof shell, and cuts off the lighting power supply through the high-power MOS switch tube in the metal explosion-proof shell, the whole process is carried out in the metal explosion-proof shell, and no electric spark is generated in the coal mine tunnel. Meanwhile, overload and short circuit conditions are accurately analyzed and judged, overload and short circuit are distinguished and timely processed, and coal production safety is guaranteed to be carried out orderly.)

1. The utility model provides an explosion-proof power supply of inflammable and explosive place illumination that coal mine tunnel was used which characterized in that: the explosion-proof power supply comprises a metal explosion-proof shell, a switch, a transformer, a rectifier bridge, a high-power MOS (metal oxide semiconductor) switching tube, a current detection sensor, a single chip microcomputer, an A/D (analog/digital) conversion circuit and a high-speed turn-off circuit, wherein the metal explosion-proof shell forms an explosion-proof part of an explosion-proof power supply body; in the metal explosion-proof shell, a switch and a transformer provide a 127V alternating current power supply, a rectifier bridge and a high-power MOS switch tube form a non-contact switch circuit to provide a power supply for an illumination load, a current detection sensor detects the current condition of the illumination circuit, an A/D conversion circuit converts a current signal detected by the current detection sensor into a digital signal and sends the digital signal to a single chip for processing, and a high-speed turn-off circuit outputs a turn-off signal at a high speed; the sensor responsible for current detection accomplishes the detection of illumination load circuit current in the metal explosion-proof housing to cut off lighting power supply through the high-power MOS switch tube in the metal explosion-proof housing, whole process is whole to be gone on in the metal explosion-proof housing, can not produce any electric spark in the coal mine tunnel.

2. The combustible and explosive place illumination explosion-proof power supply for the coal mine tunnel according to claim 1, is characterized in that: comprises a detection control system, an input part and an output part;

the detection control system is a control system formed by a singlechip with A/D conversion as a CPU, and the singlechip and an A/D conversion circuit complete the control of circuit detection;

the input part is a current detection sensor and is connected with the singlechip;

an output section: the device consists of a main circuit and a control circuit; the main circuit consists of a rectifier bridge connected to an alternating current power supply, a high-power MOS switching tube, a current detection sensor and an illumination load, wherein the current detection sensor detects an illumination load current signal, and the high-power MOS switching tube executes the task of turning off the load or overload current; the control circuit is a high-speed turn-off circuit which is composed of a comparator and two photoelectric coupling circuits and is used for controlling the high-power MOS switching tube.

3. The inflammable and explosive place lighting explosion-proof power supply for the coal mine tunnel according to the claim 1 or 2, characterized in that: the high-speed turn-off circuit is provided with a reset switch S1 and a reset indicator lamp DS 1.

4. The inflammable and explosive place lighting explosion-proof power supply for the coal mine tunnel according to the claim 1 or 2, characterized in that: the current detection sensor is an externally attached shunt JR.

5. The inflammable and explosive place lighting explosion-proof power supply for the coal mine tunnel according to the claim 1 or 2, characterized in that: the number of the photoelectric couplers is two, and the two photoelectric couplers are a first photoelectric coupler U2 and a second photoelectric coupler U3 respectively.

6. The inflammable and explosive place lighting explosion-proof power supply for the coal mine tunnel according to the claim 1 or 2, characterized in that: the triode driving circuit is composed of two triodes, wherein the two triodes are a triode I Q1 and a triode II Q2 respectively.

7. An explosion-proof method of an illumination power supply of a flammable and combustible place for a coal mine tunnel, which adopts the explosion-proof power supply defined by any one of claims 1 to 6, and is characterized by comprising the following contents:

the switch, the transformer, the rectifier bridge, the high-power MOS switch tube, the current detection sensor, the singlechip A/D conversion circuit and the high-speed turn-off circuit are arranged in a metal explosion-proof shell to form an explosion-proof part of an explosion-proof power supply body; connecting a current detection sensor in series into a transmission line for supplying power to the outside in the metal explosion-proof shell and a circuit loop of electric equipment to form a detection circuit, and detecting the current condition of the circuit; the A/D conversion circuit is responsible for converting voltage signals, detected by the current detection sensor, formed by abnormal current of lighting equipment outside the metal explosion-proof shell and a load circuit of a lighting circuit, into digital signals and transmitting the digital signals to the single chip microcomputer, the single chip microcomputer carries out calculation and judgment, the whole process of short circuit caused by overload is judged according to the current intensity and duration of the load circuit, if a short circuit phenomenon occurs, a control instruction is sent out, the high-speed turn-off circuit is controlled to rapidly turn off the power supply of the explosion-proof power supply to an external power supply transmission line and electric equipment, the short circuit time is extremely short, and is less than 1ms, and no spark is.

8. The explosion-proof method of the lighting power supply of the inflammable and explosive place for the coal mine tunnel according to claim 7, characterized in that the process of judging whether the short circuit is caused by the overload occurs by the single chip microcomputer is as follows:

firstly, a singlechip calculates actual rated current according to lighting rated load, when the lighting load current is detected to exceed 30% and be less than 50% of the rated value, the detection times are increased, if the lighting load current still exceeds 30% of the rated value after lasting for 5 seconds, a warning is given and overload information is displayed, and if the duration is more than 1 minute, the lighting load is turned off and the overload information is displayed;

when the lighting load current exceeds 50% or more of the rated value, the single chip starts to continuously detect the output current, and if the lighting load current still exceeds 50% or more of the rated value after 10 seconds, the single chip gives an audible and visual alarm, turns off the lighting load and displays overload information;

thirdly, when the lighting load current exceeds 100% or more of the rated value, the single chip starts to detect the output current in full force, and if the lighting load current still exceeds 100% or more of the rated value after 2 seconds, the single chip gives an audible and visual alarm, turns off the lighting load and displays overload information;

when the current of the lighting load is suddenly increased to be more than 200% of the rated value, the single chip microcomputer continuously collects the signals for more than 10 times, after software analysis and filtering processing, the continuously collected values exceed 200% of the rated value and more than 200%, a short circuit conclusion is given, an instruction is sent, the high-speed turn-off circuit is controlled to complete the task of turning off the circuit, and the total execution time is far less than 1 ms.

Technical Field

The invention relates to an explosion-proof power supply and a method for lighting in inflammable and explosive places for coal mine tunnels, in particular to a method and special equipment for researching prevention of major explosion accidents caused by accidental short circuit of regional lighting equipment such as coal mine tunnels, chemical engineering, oil depots and the like by aiming at electrical high-speed turn-off of high-current group lighting equipment, and simultaneously discussing research and application of a high-capacity intrinsic safety power supply, belonging to the technical field of explosion prevention of the coal mine tunnel lighting equipment.

Background

At present, a mining lighting explosion-proof switch is only explosion-proof of a switch shell, lighting equipment and lighting circuits outside the shell do not have a real explosion-proof function, and if instantaneous large current is caused by accidental short circuit or other reasons, electric sparks are easily generated, and serious disastrous accidents can be caused. The power supply and the switch for domestic coal mine tunnel illumination are mostly explosion-proof type illumination comprehensive protection devices, and the explosion-proof principle is as follows: the power supply and the switch for illumination are arranged in the metal explosion-proof shell, and the metal explosion-proof shell can supply power to the outside after being sealed and closed, so the explosion-proof type illumination comprehensive protection only has a physical explosion-proof function on related electrical switches, equipment and the like in the metal explosion-proof shell, and cannot affect the outside when explosion occurs. The protection of lighting equipment and lighting circuits outside the shell is realized by switching off the relay contacts to cut off the overload large current or short-circuit current of the circuit, and the action time of the relay is longer (0.13-0.36 s) due to the existence of the inductance coil in the action process of the relay, so that the generation of instant electric sparks during short circuit cannot be blocked in time. If the lighting equipment and lighting lines outside the metal explosion-proof shell are accidentally short-circuited or are broken by metal objects such as coal mining equipment and working face supports to cause instantaneous large current, electric sparks are easily generated, and serious catastrophic accidents can be caused. Therefore, a large number of explosion-proof type illumination comprehensive protection devices for coal mine tunnels in the prior art do not have a real integral explosion-proof function. In addition, the lighting load condition in the coal mine tunnel is complex, only transient overload appears sometimes, the risk of short circuit does not appear, the overload fluctuation is large sometimes, short circuit can be caused by overload sometimes, short circuit accidents appear sometimes, however, the prior art cannot accurately distinguish, misoperation and untimely operation are easily caused, and adverse effects are brought to coal production.

Disclosure of Invention

The invention aims to provide an explosion-proof power supply and an explosion-proof method for lighting in an inflammable and explosive place for a coal mine tunnel, which can ensure that the power supply and the switch for lighting in the coal mine tunnel not only have an explosion-proof function (arranged in a metal explosion-proof shell), but also have a real integral explosion-proof function for lighting circuits and lighting equipment arranged outside the metal explosion-proof shell in the inflammable and explosive place, do not generate electric sparks, prevent serious catastrophic accidents, accurately analyze and judge overload and short-circuit conditions, distinguish the overload and short-circuit and process the overload and short-circuit in time, ensure that the coal production is carried out orderly, and even solve the problems in the prior art.

The technical scheme of the invention is as follows:

an explosion-proof power supply for lighting in inflammable and explosive places for coal mine tunnels comprises a metal explosion-proof shell, a switch, a transformer, a rectifier bridge, a high-power MOS (metal oxide semiconductor) switching tube, a current detection sensor, a single chip microcomputer, an A/D (analog/digital) conversion circuit and a high-speed turn-off circuit, wherein the metal explosion-proof shell forms an explosion-proof part of an explosion-proof power supply body; in the metal explosion-proof shell, a switch and a transformer provide a 127V alternating current power supply, a rectifier bridge and a high-power MOS switch tube form a non-contact switch circuit to provide a power supply for an illumination load, a current detection sensor detects the current condition of the illumination circuit, an A/D conversion circuit converts a current signal detected by the current detection sensor into a digital signal and sends the digital signal to a single chip for processing, and a high-speed turn-off circuit outputs a turn-off signal at a high speed; the current detection sensor completes the detection of the current of the lighting load circuit in the metal explosion-proof shell, and cuts off the lighting power supply through the high-power MOS switch tube in the metal explosion-proof shell, the whole process is completely carried out in the metal explosion-proof shell, and no electric spark can be generated in a coal mine tunnel.

The hardware composition of the invention comprises a detection control system, an input part and an output part;

the detection control system is a control system formed by a singlechip with A/D conversion as a CPU, and the singlechip and an A/D conversion circuit complete the control of circuit detection;

the input part is a current detection sensor and is connected with the singlechip;

an output section: the device consists of a main circuit and a control circuit; the main circuit consists of a rectifier bridge connected to an alternating current power supply, a high-power MOS switching tube, a current detection sensor and an illumination load, wherein the current detection sensor detects an illumination load current signal, and the high-power MOS switching tube executes the task of turning off the load or overload current; the control circuit is a high-speed turn-off circuit which is composed of a comparator and two photoelectric coupling circuits and is used for controlling the high-power MOS switching tube.

The invention is also provided with related auxiliary equipment and measuring tools, which comprise a radiator, an auxiliary current detection sensor, an auxiliary state detection electronic switch circuit, a detection relay, a state indicator lamp and the like.

The auxiliary state detection electronic switch circuit comprises a transistor 9013 and a resistor, and the state indicator lamp is an LED with a current-limiting resistor.

An explosion-proof method for an illumination power supply of a flammable and combustible place for a coal mine tunnel comprises the following steps:

the switch, the transformer, the rectifier bridge, the high-power MOS switch tube, the current detection sensor, the singlechip A/D conversion circuit and the high-speed turn-off circuit are arranged in a metal explosion-proof shell to form an explosion-proof part of an explosion-proof power supply body; connecting a current detection sensor in series into a transmission line for supplying power to the outside in the metal explosion-proof shell and a circuit loop of the lighting load to form a detection circuit, and detecting the current condition of the lighting load circuit; the A/D conversion circuit is responsible for converting a voltage signal formed by circuit current abnormal motion detected by the current detection sensor into a digital signal and transmitting the digital signal to the single chip microcomputer, the single chip microcomputer carries out calculation and judgment, the whole process of short circuit caused by overload is judged according to the intensity and the duration of an overload circuit, if a short circuit phenomenon occurs, a control instruction is sent out, the high-speed turn-off circuit is controlled to rapidly turn off the power supply of the explosion-proof power supply to an external power supply transmission line and electric equipment, the short circuit time is extremely short and is less than 1mS, and no spark is generated at a short circuit.

The process that the single chip microcomputer judges whether overload occurs or not so as to cause short circuit is as follows:

firstly, the single chip microcomputer calculates actual rated current according to lighting rated load, when the lighting load current is detected to exceed 30% and be less than 50% of the rated value, the detection times are increased, if the lighting load current still exceeds 30% of the rated value after lasting for 5 seconds, a warning is given and overload information is displayed, and if the duration is longer than 1 minute, the lighting load is turned off and the overload information is displayed.

And secondly, when the lighting load current is detected to exceed 50% or more of the rated value, the single chip microcomputer starts to continuously detect the output current, and if the lighting load current still exceeds 50% or more of the rated value after 10 seconds, the single chip microcomputer gives an audible and visual alarm, turns off the lighting load and displays overload information.

When the lighting load current exceeds 100% of the rated value and above, the single chip starts to detect the output current in full force, and if the lighting load current still exceeds 100% of the rated value and above after 2 seconds, the single chip gives an audible and visual alarm, turns off the lighting load and displays overload information.

When the current of the lighting load is suddenly increased to be more than 200% of the rated value, the single chip microcomputer continuously collects the signals for more than 10 times, after software analysis and filtering processing, the continuously collected values exceed 200% of the rated value and more than 200%, a short circuit conclusion is given, an instruction is sent, the high-speed turn-off circuit is controlled to complete the task of turning off the circuit, and the total execution time is far less than 1 ms.

The high-speed turn-off circuit is composed of a comparator, photoelectric couplers and a triode drive circuit, a current detection sensor is connected with a non-contact switch circuit in the non-contact switch circuit in series, an output signal is connected with the comparator, the comparator is connected with the two photoelectric couplers and the triode drive circuit, and the output of the triode drive circuit is connected with a high-power MOS switch tube. The high-speed turn-off circuit is provided with a reset switch S2 and a reset indicator lamp DS 1; the high-speed shutdown circuit is used for resetting after action. The current detection sensor is an externally attached shunt JR. The number of the photoelectric couplers is two, namely a first photoelectric coupler U2 and a second photoelectric coupler U3, and the two photoelectric couplers have the effect of isolating the ground. The triode driving circuit is composed of two triodes, wherein the two triodes are a triode I Q1 and a triode II Q2 respectively. The lighting load ZM is 2500W; the model of the first photoelectric coupler U2 and the model of the second photoelectric coupler U3 are 4503, the model of the first triode Q1 is 9103, and the model of the second triode Q2 is 9102.

The innovation points of the invention are as follows:

1. the current detection sensor completes the detection of the current of the lighting load circuit in the metal explosion-proof shell, and cuts off the lighting power supply through the high-power MOS switch tube in the metal explosion-proof shell, the whole process is completely carried out in the metal explosion-proof shell, no electric spark can be generated in a coal mine tunnel, and the whole process really has an explosion-proof function.

2. The overload and short circuit conditions are accurately analyzed and judged, the overload and short circuit conditions are respectively processed according to the intensity and the duration of an overload circuit, and meanwhile, the overload and short circuit conditions are distinguished and processed in time, so that the coal production safety is ensured to be carried out orderly.

The invention has the beneficial effects that: the invention relates to a method for preventing serious explosion accidents possibly caused by accidental short circuit of regional lighting equipment such as coal mine tunnels, chemical engineering, oil depots and the like, and breaks through the bottleneck that the conventional domestic flammable and explosive regional lighting explosion-proof switch only has an explosion-proof function and does not have the explosion-proof function on lighting equipment and lighting circuits outside the switch shell, so that the safety lighting of flammable and explosive places is greatly improved, the safety of an operation site is improved in a bright environment, the popularization and application are easy, meanwhile, the overload and short circuit conditions are accurately analyzed and judged, the overload and short circuit conditions are distinguished and timely processed, and the coal production safety is ensured to be orderly carried out.

Drawings

FIG. 1 is a functional block diagram of the present invention;

fig. 2 is an electrical schematic diagram of the present invention, which is not shown in the figure because the electrical switch and the transformer are common standard components.

Detailed Description

The invention is further illustrated by the following examples in conjunction with the accompanying drawings.

An explosion-proof power supply for lighting in inflammable and explosive places for coal mine tunnels comprises a metal explosion-proof shell, a switch, a transformer, a rectifier bridge, a high-power MOS (metal oxide semiconductor) switching tube, a current detection sensor, a single chip microcomputer, an A/D (analog/digital) conversion circuit and a high-speed turn-off circuit, wherein the metal explosion-proof shell forms an explosion-proof part of an explosion-proof power supply body; in the metal explosion-proof shell, a switch and a transformer provide a 127V alternating current power supply, a rectifier bridge and a high-power MOS switch tube form a non-contact switch circuit to provide a power supply for an illumination load, a current detection sensor detects the current condition of the illumination circuit, an A/D conversion circuit converts a current signal detected by the current detection sensor into a digital signal and sends the digital signal to a single chip for processing, and a high-speed turn-off circuit outputs a turn-off signal at a high speed; the current detection sensor completes the detection of the current of the lighting load circuit in the metal explosion-proof shell, and cuts off the lighting power supply through the high-power MOS switch tube in the metal explosion-proof shell, the whole process is completely carried out in the metal explosion-proof shell, and no electric spark can be generated in a coal mine tunnel.

The invention is also provided with related auxiliary equipment and measuring tools, which comprise a radiator, an auxiliary current detection sensor, an auxiliary state detection electronic switch circuit, a detection relay, a state indicator lamp and the like.

The auxiliary state detection electronic switch circuit comprises a transistor 9013 and a resistor, and the state indicator lamp is an LED with a current-limiting resistor.

An explosion-proof method for an illumination power supply of a flammable and combustible place for a coal mine tunnel comprises the following steps:

the switch, the transformer, the rectifier bridge, the high-power MOS switch tube, the current detection sensor, the singlechip A/D conversion circuit and the high-speed turn-off circuit are arranged in a metal explosion-proof shell to form an explosion-proof part of an explosion-proof power supply body; connecting a current detection sensor in series into a transmission line for supplying power to the outside in the metal explosion-proof shell and a circuit loop of electric equipment to form a detection circuit, and detecting the current condition of the circuit; the A/D conversion circuit is responsible for converting a voltage signal formed by circuit current abnormal motion detected by the current detection sensor into a digital signal and transmitting the digital signal to the single chip microcomputer, the single chip microcomputer carries out calculation and judgment, the whole process of short circuit caused by overload is judged according to the intensity and the duration of an overload circuit, if a short circuit phenomenon occurs, a control instruction is sent out, the high-speed turn-off circuit is controlled to rapidly turn off the power supply of the explosion-proof power supply to an external power supply transmission line and electric equipment, the short circuit time is extremely short, and the short circuit point does not generate sparks for less than 1 ms.

In the embodiment, the hardware composition and the working principle of the invention are as follows:

the hardware comprises a detection control system, an input part and an output part.

Referring to fig. 1 and 2, the load capacity parameter of the detection control system is: the voltage AC127V (220V), the current 10-20A, the current voltage parameter can be adjusted. A control system is composed of a 51-series singlechip STC89C51 with A/D conversion as a CPU, and the singlechip and the A/D conversion circuit complete the control of circuit detection.

An input section: the Q53 type externally attached shunt with JR of 300mv/30A is used as a current detection sensor for detecting the current of a main circuit, one end of the current detection sensor is connected to P1.0 of an STC89C51 CPU, and the other end of the current detection sensor is connected to an ANGND end of the STC89C51 CPU.

An output section: the device consists of a main circuit and a control circuit; the main circuit consists of a rectifier bridge (D1-D4) KPB5010 connected to AC127V (220V), an ATP10050 type MOSFET switching tube Q3, JR and a lighting load ZM 1000-2500W; the load current and detection signal are provided, and the task of switching off the load or overload current can be executed; the control circuit is connected with the input end of the optical coupling circuit 4503 through the output end of STC89C51, and the control of the main circuit is completed through the optical coupling circuit 4503.

The software and control process of the invention are as follows:

software: the detection control system adopts C language to program software.

The control process is as follows:

firstly, the single chip microcomputer calculates the actual rated current to be 20A according to the lighting rated load, a voltage of about 200mV is generated at an A/D input end of the single chip microcomputer STC89C51, the digital quantity is about 20 after A/D conversion, when the lighting load current is detected to exceed 30% and be less than 50% of the rated value, the digital quantity is about 26-30 after A/D conversion, the detection times are started to be increased, if the lighting load current still exceeds 30% of the rated value after lasting for 5 seconds, a warning is given and overload information is displayed, and if the duration is longer than 1 minute, the lighting load is turned off and the overload information is displayed.

When the lighting load current exceeds 50% or more of the rated value, the digital quantity is changed into more than 30 after A/D conversion, the single chip microcomputer starts to continuously detect the output current, and if the lighting load current still exceeds 50% of the rated value after 10 seconds, the single chip microcomputer sends out sound and light alarm, turns off lighting output and displays overload information.

When the lighting load current exceeds 100% of the rated value and above, the digital quantity is changed into more than 60 after A/D conversion, the single chip microcomputer starts to continuously detect the output current, and if the lighting load current still exceeds 100% of the rated value after 2 seconds, the single chip microcomputer sends out sound-light alarm, turns off lighting output and displays overload information.

When the current of the lighting load is suddenly increased to 200% or more of the rated value, the current is converted into a digital value of 90 or more after A/D conversion, the single chip microcomputer continuously collects the signals for more than 10 times, after software analysis and filtering processing, the continuously collected values exceed 200% of the rated value, a short circuit conclusion is given, an instruction is sent, the high-speed turn-off circuit is controlled to complete the task of turning off the circuit, the lighting output is turned off, and the total execution time is far less than 1 ms.

The high-speed turn-off circuit is composed of a comparator, photoelectric couplers and a triode drive circuit, a current detection sensor is connected with a non-contact switch circuit in the non-contact switch circuit in series, an output signal is connected with the comparator, the comparator is connected with the two photoelectric couplers and the triode drive circuit, and the output of the triode drive circuit is connected with a high-power MOS switch tube. The high-speed turn-off circuit is provided with a reset switch S2 and a reset indicator lamp DS 1; the high-speed shutdown circuit is used for resetting after action. The current detection sensor is an externally attached shunt JR. The number of the photoelectric couplers is two, namely a first photoelectric coupler U2 and a second photoelectric coupler U3, and the two photoelectric couplers have the effect of isolating the ground. The triode driving circuit is composed of two triodes, wherein the two triodes are a triode I Q1 and a triode II Q2 respectively. The lighting load ZM is 2500W; the model of the first photoelectric coupler U2 and the model of the second photoelectric coupler U3 are 4503, the model of the first triode Q1 is 9103, and the model of the second triode Q2 is 9102.

The single chip microcomputer detects the occurrence of a short circuit phenomenon, sends out a control instruction, and completes the process of rapidly turning off the explosion-proof power supply to supply power to an external power supply transmission line and electric equipment as follows:

the single chip microcomputer sends out a control instruction to enable P1.0 to be 1.

② if-IN of the comparator LT1713 is 1, the OUT end is 0, which leads to 0 at the V0 end of U2, and leads to the turn-off of the triode Q1 and the turn-on of the Q2.

And thirdly, the G end of the high-power MOS switching tube Q3 is-15V, the S end is +8V, the switching-off is rapid, and the ZM load is powered off. The U3 functions to remain in a powered down state.

The test control system of the present invention is wired as shown in fig. 2, and table 1 shows the functions and parameters of the circuit elements of fig. 2.

TABLE 1

In the embodiment, the lighting load 2500W is loaded, when a short circuit is broken in a dark place by using a wire between loads or lines, the lighting circuit is turned off, no spark is generated, the actions are repeated, no spark is generated, the expected target is achieved, and meanwhile, the detection control system can detect whether the line is short-circuited or not when being started.