CN210273502U - Strong electromagnetic pulse multi-stage protection device with detection and display functions - Google Patents
Strong electromagnetic pulse multi-stage protection device with detection and display functions Download PDFInfo
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Abstract
The utility model discloses a strong electromagnetic pulse multi-stage protection device with listen display function belongs to the electromagnetic pulse protection field, including phase line L, neutral conductor N, ground wire PE, preceding stage transient state processing module, back level transient state processing module, steady state filtering module and listen display module, phase line L connects gradually preceding stage transient state processing module, steady state filtering module and back level transient state processing module, neutral conductor N connects gradually preceding stage transient state processing module, steady state filtering module and back level transient state processing module, ground wire PE is connected with preceding stage transient state processing module and back level transient state processing module; the utility model can delay the fast pulse, thereby ensuring that the back-stage system has enough time to process the pulse; the functions of the electromagnetic pulse protection equipment are integrated, so that the electromagnetic pulse protection equipment can adapt to various application scenes; whether the working state of the pulse processing module is intact can be detected, and the times of processing the electromagnetic pulse are counted.
Description
Technical Field
The utility model belongs to electromagnetic pulse protection field relates to a strong electromagnetic pulse multi-stage protector with listen display function.
Background
In modern society, various electromagnetic pulses generated by nature and man-made people, such as lightning electromagnetic pulses, nuclear pulses (high-altitude nuclear electromagnetic pulses), high-power microwaves, ultra-wideband, internal surges, clutter harmonics, strong electromagnetic pulse interference and the like generated when system equipment operates, are interfered more and more frequently, and sensitive electronic systems and equipment are damaged by generated ultrastrong transient pulses; with the development of science and technology, a large number of large-scale integrated circuits are adopted in advanced electronic equipment, and the larger the integration scale is, the more sensitive the electronic equipment is, and the more easily the electronic equipment is interfered by electromagnetic pulses. Therefore, it is imperative to protect sensitive electronic systems and devices from electromagnetic pulses in a comprehensive manner.
The existing protection equipment can be classified into a power supply class, a data class and an antenna feeder class according to functions, wherein the power supply class can be classified into a direct current class and an alternating current class, but the protection equipment often has certain limitations, can only protect electromagnetic pulses with specific energy or frequency spectrum (waveform), and cannot achieve the effect of comprehensive protection especially for fast pulses with short rising edge time, and the protection efficiency needs to be further improved; if the requirements of overall protection of the system and the equipment are met, the electromagnetic pulse protection module, the lightning protection module, the EMI filtering module and the like with single functions are required to be additionally arranged in each system and equipment respectively, and if the equipment is arranged at the same time, the weight and the size of the equipment are greatly influenced, so that the performance of the system and the equipment is not favorably exerted. In modern electronic technology, each system and equipment requires miniaturization, integration and lightweight, so the practicability of the protection scheme is not high; and the existing protective equipment does not have the function of detecting and displaying, can not count the times of processing electromagnetic pulses, and can not detect the state of the pulse processing module.
Disclosure of Invention
The utility model aims to provide a: the strong electromagnetic pulse multi-stage protection device with the detection and display functions solves the problems mentioned in the background technology.
The utility model adopts the technical scheme as follows:
the utility model provides a multistage protector of strong electromagnetic pulse with listen display function, includes phase line L, neutral conductor N, ground wire PE, preceding stage transient state processing module, back level transient state processing module, steady state filter module and listen the display module, phase line L divide into first phase line L1, second phase line L2, third phase line L3, preceding stage transient state processing module, steady state filter module and back level transient state processing module are connected in proper order to phase line L, neutral conductor N connects preceding stage transient state processing module, steady state filter module and back level transient state processing module in proper order, ground wire PE is connected with preceding stage transient state processing module and back level transient state processing module, be provided with between preceding stage transient state processing module and the back level transient state processing module and listen the display module.
The existing protection equipment can be classified into a power supply class, a data class and an antenna feeder class according to functions, wherein the power supply class can be classified into a direct current class and an alternating current class, but the protection equipment often has certain limitations, can only protect electromagnetic pulses with specific energy or frequency spectrum (waveform), and cannot achieve the effect of comprehensive protection especially for fast pulses with short rising edge time, and the protection efficiency needs to be further improved; if the requirements of overall protection of the system and the equipment are met, the electromagnetic pulse protection module, the lightning protection module, the EMI filtering module and the like with single functions are required to be additionally arranged in each system and equipment respectively, and if the equipment is arranged at the same time, the weight and the size of the equipment are greatly influenced, so that the performance of the system and the equipment is not favorably exerted. In modern electronic technology, each system and equipment requires miniaturization, integration and lightweight, so the practicability of the protection scheme is not high; the existing protection equipment does not have a detection display function, can not count the times of processing electromagnetic pulses and can not detect the state of the pulse processing module; and the existing protective equipment has poor protective capability for a system with low tolerance capability.
The utility model relates to a strong electromagnetic pulse multi-stage protection device with listen display function, transient state processing module can let into the ground with strong pulse energy, prevents that rear end high energy transient state module of releasing from causing the short circuit to ground of short time after the damage under extreme condition. The steady-state filtering module filters strong pulses coupled into the cable and harmonic clutter of a useless frequency band generated during system operation, and simultaneously further clamps residual voltage processed by the transient processing module to prevent spike pulses in the transient processing module from being coupled into a back-end system; through the coordination of the transient processing module and the steady-state filtering module, the fast pulse coupled with a cable is delayed, and the rising edge time of the fast pulse is reduced, so that a rear-stage system is ensured to have sufficient time to process the pulse. For a system with high tolerance capability, such as a power supply system, after the two stages of processing, the residual voltage of a back-end system can be sensed to meet the requirement, namely the residual voltage cannot damage the back-end system, so that the back-end system can be protected only by the preceding stage transient processing module and the steady-state filtering module. However, for a system with low endurance capacity, such as a communication system, the sensitivity is high, and after the front-end two-stage processing, the system can sense the residual voltage of the back-end system and still cause different damage to the system, so that the back-end transient processing module and the front-end transient processing module need to be designed to cooperate together to protect the system. The detection display module detects whether the working state of the pulse processing buying block is intact or not, counts the times of processing the electromagnetic pulse, and transmits the detected state to the state display module. The user can intuitively know the protection performance of the current protection device and the number of times of the pulse suffered by the current protection device through the module, and support and help can be provided for the improvement and perfection of the subsequent pertinence of a user system. Compared with various original protective equipment which needs to be independently installed, the device integration level is higher, the size is reduced, the installation space is saved, the cost is greatly reduced, the protective equipment can adapt to various application scenes, the application range of the protective equipment is enlarged, and the protective equipment can be applied to transient strong electromagnetic field environments such as various communication base stations, electric power systems, large pulse power devices, large scientific research institutions, production and processing workshops, test turntables, aircrafts, missile-borne, vehicles-borne, ship-borne, ground control stations, island reefs and the like, so that strong electromagnetic pulses are effectively prevented from invading various systems and equipment, and the continuous and stable operation of the protective equipment is ensured.
Further, the preceding stage transient processing module includes a first protection unit P1, a second protection unit P2, a third protection unit P3 and a fourth protection unit P4, each protection unit includes a high-energy transient protection module F and a high-energy transient discharge module RV therein, one end of the high-energy transient protection module F is an input end of the protection unit where the high-energy transient protection module F is located, the other end of the high-energy transient protection module F is connected with one end of the high-energy transient discharge module RV, and the other end of the high-energy transient discharge module RV is an output end of the protection unit where the high-energy transient discharge module RV is located; the input end of the first protection unit P1, the input end of the second protection unit P2 and the input end of the third protection unit P3 are respectively connected with a first phase line L1, a second phase line L2 and a third phase line L3; the output terminal of the first protection unit P1, the output terminal of the second protection unit P2, and the output terminal of the third protection unit P3 are all connected to the ground line PE, the input terminal of the fourth protection unit P4 is connected to the neutral line N, and the output terminal of the fourth protection unit P4 is connected to the ground line PE.
The high-energy transient discharge module RV is connected with the system in parallel, when the system works normally, the open-circuit state of the high-energy transient discharge module RV does not influence the normal work of the system, when strong electromagnetic pulse coupling enters the cable, the cable is conducted in a transient state (ns level), so that strong pulse energy (large pulse current and high pulse voltage) is discharged to the ground and is restored to the open-circuit state after the strong pulse energy is discharged to the ground, and the whole treatment process is in a mu s level and does not influence the work of the system.
The high-energy transient protection module F mainly has the functions of preventing short-time ground short circuit caused by the damage of the rear-end high-energy transient discharge module RV under extreme conditions, namely, the rear-end processing module can be switched off in a transient state after being damaged, the normal work of a system is not influenced, and the functions of automatic fault switching-off and failure transient protection are achieved.
Further, the steady-state filtering module comprises a first capacitor bank, a second capacitor bank, a resistor bank and an inductor bank, wherein the first capacitor bank comprises a capacitor Cx1. Capacitor C x2. Capacitor C x3, the second capacitor bank comprises a capacitor Cy1. Capacitor C y2. Capacitor C y3. Capacitor C y4. Capacitor C y5. Capacitor C y6. Capacitor C y7. Capacitor C y8, the resistance group includes resistance R1, resistance R2, resistance R3, and the inductance group includes inductance Lcom1. Inductor L com2, the inductance Lcom1 and inductance LcomEach 2 consists of four windings and a magnetic ring;
the first phase line L1 is sequentially connected with a capacitor Cx1 input terminal, resistor R1 input terminal, inductor Lcom1. Capacitor Cy1 input terminal, inductance L com2. Capacitor C y5, the input ends are connected; the second phase line L2 is sequentially connected with a capacitor C x2, input terminal of resistor R2, inductor Lcom1. Capacitor C y2 input terminal, inductance L com2. Capacitor C y6, the input ends are connected; the third phase line L3 is sequentially connected with a capacitor C x3, input terminal of resistor R3, inductor Lcom1. Capacitor C y3 input terminal, inductance L com2. Capacitor C y7 is connected with the input end; the neutral line N is connected with the capacitor C in sequencex1 output terminal, resistor R1 output terminal, capacitor C x2, an output terminal of the resistor R2, and a capacitor C x3, output terminal of resistor R3, inductor Lcom1. Capacitor C y4 input terminal, inductance L com2. Capacitor C y8, the ground wire PE is connected with the capacitor C in sequencey1 output terminal, capacitor C y2 output terminal, capacitor C y3 output terminal and capacitor C y4 output terminal, capacitor C y5 output terminal, capacitor C y6 output terminal, capacitor C y7 output terminal and capacitor C y8, and an output terminal.
The steady-state filtering module consists of a filtering device, and the working principle of the steady-state filtering module is basically the same as that of a filter. The main function of the system is to filter out the strong pulse coupled into the cable and the harmonic clutter of the useless frequency band generated during the operation of the system, and further clamp the residual voltage processed by the transient processing module to prevent the spike pulse from being coupled into the back-end system. Through the coordination of the preceding stage transient processing module and the steady state filtering module, the fast pulse (mainly pulse without processing, the energy of the fast pulse is small, such as the fast pulse with the rising edge less than 5 ns) coupled to a cable is delayed, when the fast pulse is transmitted to the module, firstly, most interference pulse (energy) is filtered by the module, the rising edge time of the interference pulse is reduced, secondly, certain obstruction is formed on other pulse (energy) which cannot be filtered, and the time for transmitting the interference pulse to a back-end system is delayed, so that the back-stage processing module is ensured to have sufficient time for processing the pulse (energy). The steady-state filtering module further improves the comprehensive protection performance, has high-energy transient absorption prevention capability and carries out ultrafast discharge on the invasion pulse.
Further, the post-stage transient processing module includes a first processing unit T1, a second processing unit T2, a third processing unit T3 and a fourth processing unit T4, each processing unit includes a high-energy transient protection module F and a rear-end high-energy transient discharge module VR, one end of the high-energy transient protection module F is an input end of the processing unit where the processing unit is located, the other end of the high-energy transient protection module F is connected with one end of the rear-end high-energy transient discharge module VR, and the other end of the rear-end high-energy transient discharge module VR is an output end of the processing unit where the processing unit is located; the input end of the first processing unit T1, the input end of the second processing unit T2 and the input end of the third processing unit T3 are connected with a first phase line L1, a second phase line L2 and a third phase line L3 respectively; the output terminal of the first processing unit T1, the output terminal of the second processing unit T2, and the output terminal of the third processing unit T3 are all connected to the ground line PE, the input terminal of the fourth processing unit T4 is connected to the neutral line N, and the output terminal of the fourth processing unit T4 is connected to the ground line PE.
And F is a high-energy transient protection module, the action of which is consistent with that of the high-energy transient protection module in the preceding stage transient processing module, namely failure transient protection. The transient suppression diode VR is a high-energy transient bleeder module, and compared with a high-energy transient bleeder module in a preceding stage transient processing module, the transient suppression diode VR has the greatest advantages of ultralow clamping voltage and ultrafast response time, the maximum pulse processing capacity of 10kA, and the response time of ps-level.
For a system with high tolerance capability, such as a power supply system, after the two stages of processing, the residual voltage of a back-end system can be sensed to meet the requirement, namely the residual voltage cannot damage the back-end system, so that the back-end system can be protected only by the preceding stage transient processing module and the steady-state filtering module. However, for a system with low endurance capacity, such as a communication system, the sensitivity is high, and after the front-end two-stage processing, the system can sense the residual voltage of the back-end system and still cause different damage to the system, so that the back-end transient processing module and the front-end transient processing module need to be designed to cooperate together to protect the system.
Further, the detection display module comprises a shell, diodes CR 1-CR 4, light emitting diodes DS 1-DS 5, resistors R4-R16, optical couplers U1-U6, a capacitor CN1, a resistor RN1, an inductor L1, a NAND gate trigger U7, a connector P1, an alternating current-direct current converter, a singlechip U8, a capacitor C1, a capacitor C2, a capacitor C3, a switch S1, a display DS6 and a plurality of display resistor groups;
the shell is grounded, and the input end of the diode CR1, the input end of the diode CR2, the input end of the diode CR3 and the input end of the diode CR4 are connected with the transient processing module;
the output end of the diode CR1 is sequentially connected with the input end 2 of a resistor R4, a resistor R5, a light-emitting diode DS1 and an optocoupler U1; the output end of the diode CR2 is sequentially connected with the input end 2 of the resistor R6, the resistor R7, the light-emitting diode DS2 and the optocoupler U2; the output end of the diode CR3 is sequentially connected with the input end 2 of the resistor R8, the resistor R9, the light-emitting diode DS3 and the optocoupler U3; the output end of the diode CR4 is sequentially connected with the input end 2 of the resistor R10, the resistor R11, the light-emitting diode DS4 and the optocoupler U4; an input end 1 of the optocoupler U1, an input end 1 of the optocoupler U2 and an input end 1 of the optocoupler U3 are connected with a neutral line; the input end 1 of the optocoupler U4 is connected with the transient processing module; the output end 3 of the optocoupler U1, the output end 3 of the optocoupler U2, the output end 3 of the optocoupler U3 and the output end 3 of the optocoupler U4 are respectively connected with the input end 1, the input end 2, the input end 3 and the input end 4 of the NAND gate trigger U7, and the output ends 3 of the optocouplers U1-U4 are also connected with the capacitor CN1 and the resistor RN 1; the output end 4 of the optocoupler U1, the output end 4 of the optocoupler U2, the output end 4 of the optocoupler U3 and the output end 4 of the optocoupler U4 are respectively connected with the input end 14, the input end 5, the input end 6, the input end 11 and the input end 12 of the NAND gate trigger U7, and the output ends 4 of the optocouplers U1-U4 are also connected with the interface 2 of the connector P1 and the interface 1 of the AC-DC converter; the rejection CN1 is connected with the rejection RN1, the input end of the NAND gate trigger U7, the output end of the light emitting diode DS4, the interface 1 of the connector P1 and the interface 2 of the AC-DC converter; the output end 8 of the NAND gate trigger U7 is sequentially connected with a resistor R16 and a light emitting diode DS 5;
the resistor R12, the resistor R13 and the inductor L1 are connected in parallel, one end of the resistor R13 is connected with an interface 1 of an optocoupler U5 and an interface 2 of an optocoupler U6, the other end of the resistor R13 is connected with an interface 2 of an optocoupler U5 and an interface 1 of an optocoupler U6 through a resistor R14, an output end 4 of an optocoupler U5 and an output end 4 of an optocoupler U6 are both connected with an interface 2 of an alternating current-direct current converter, an output end 5 of the optocoupler U5 is connected with an output end 5 of the optocoupler U6 and is connected into the interface 1 of the alternating current-direct current converter and an interface 9 of a connector P1 through a resistor R15, an interface 3 of the alternating current-direct current converter is connected with a first phase line L39;
the interfaces 1-10 and 23-26 of the single chip microcomputer U8 are all connected with wires, each wire is connected with a display resistor group, each display resistor group comprises two resistors connected in series, a display DS6 is connected between the two resistors of each display resistor group, the tail ends of the sixteen wires are all connected into one end of a capacitor C3, and the other end of the capacitor C3 is sequentially connected with a switch S1 and an interface 1 of a connector P1;
the interface 12 of the single chip microcomputer is sequentially connected with one end of a capacitor C1, one end of a capacitor C2 and the interface 2 of a connector P1; the interface 14 of the single chip microcomputer is sequentially connected with the other end of the capacitor C1, the other end of the capacitor C2 and the interface 1 of the connector P1;
and the interface 18 of the singlechip U8 is sequentially connected with the switch S1 and the interface 1 of the connector.
The detection display module detects whether the working state of the pulse processing module is intact, counts the times of processing the electromagnetic pulse, and transmits the detected state to the state display module. The user can intuitively know the protection performance of the current protection device and the number of times of the pulse suffered by the current protection device through the module, and support and help can be provided for the improvement and perfection of the subsequent pertinence of a user system.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:
1. the utility model relates to a strong electromagnetic pulse multi-stage protection device with listen display function through setting up preceding stage transient state processing module, can let into the ground with strong pulse energy, prevents that rear end high energy transient state from releasing the module and causing the short circuit to ground of short time after the damage under extreme condition.
2. The utility model relates to a strong electromagnetic pulse multi-stage protection device with listen display function, through setting up steady state filtering module, the harmonic clutter that produces useless frequency channel when getting into the strong pulse of cable and the system operation to the coupling carries out the filtering, carries out further clamp system with the residual pressure after transient state processing module handles simultaneously, avoids in the peak pulse coupling among them to the back-end system.
3. The utility model relates to a multistage protector of strong electromagnetic pulse with listen display function, through the coordination of preceding stage transient state processing module and steady state filtering module, carry out the time delay like the fast pulse of cable to the coupling, reduce its rise time to ensure that back-end system has sufficient time to handle the pulse.
4. The utility model relates to a strong electromagnetic pulse multi-stage protector with listen display function, through setting up back level transient state processing module, to the very high system of sensitivity, two-stage transient state processing module cooperates jointly, comes to protect the system.
5. The utility model relates to a strong electromagnetic pulse multistage protector with listen display function listens display module through the setting, can handle the operating condition who buys the piece to the pulse whether intact spying, can make statistics of the number of times of handling electromagnetic pulse to the state that will listen is carried to state display module. The user can intuitively know the protection performance of the current protection device and the number of times of the pulse suffered by the current protection device through the module, and support and help can be provided for the improvement and perfection of the subsequent pertinence of a user system. .
6. The utility model relates to a multistage protector of strong electromagnetic pulse with listen display function, the function to electromagnetic pulse protective equipment has been integrated, the volume reduces, practice thrift installation space, make it can adapt to multiple application scene, protective equipment's application range has been increased, if can be applied to all kinds of communication basic stations, electric power system, large-scale pulse power device, large-scale scientific research institute, the production and processing workshop, the test revolving stage, the machine carries, the missile-borne, on-vehicle, the carrier-borne, ground control station, transient strong electromagnetic field environment such as island reef, effectively protect each system of strong electromagnetic pulse invasion, equipment, ensure its continuous steady operation.
7. The utility model relates to a strong electromagnetic pulse multistage protector with listen display function through tertiary coordination, consolidates from airspace reinforcement, energy domain reinforcement, frequency domain reinforcement, synthesizes the protection to the strong electromagnetic pulse of intrusion system equipment comprehensively, guarantees the normal operating of system's equipment.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and that for those skilled in the art, other relevant drawings can be obtained according to the drawings without inventive effort, wherein:
FIG. 1 is a block diagram of a strong electromagnetic pulse multi-stage protection device with detection and display functions;
fig. 2 is a schematic circuit diagram of a preceding stage transient processing module according to the present invention;
fig. 3 is a schematic circuit diagram of the steady-state filter module of the present invention;
fig. 4 is a schematic circuit diagram of a post-stage transient processing module of the present invention;
fig. 5 is a schematic diagram of a first partial circuit of the detection display module according to the present invention.
Fig. 6 is a schematic diagram of a second partial circuit of the detection display module of the present invention.
Fig. 7 is a schematic diagram of a local circuit of the strong electromagnetic pulse multi-stage protection device with the detecting and displaying functions of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the described embodiments are only some, but not all embodiments of the invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The features and properties of the present invention will be described in further detail with reference to the following examples.
Example one
The utility model provides a pair of strong electromagnetic pulse multi-stage protection device with listen display function, including phase line L, neutral conductor N, ground wire PE, preceding stage transient state processing module, back level transient state processing module, steady state filtering module and listen display module, phase line L divide into first phase line L1, second phase line L2, third phase line L3, phase line L connects gradually preceding stage transient state processing module, steady state filtering module and back level transient state processing module, neutral conductor N connects gradually preceding stage transient state processing module, steady state filtering module and back level transient state processing module, ground wire PE is connected with preceding stage transient state processing module and back level transient state processing module, be provided with between preceding stage transient state processing module and the back level transient state processing module and listen display module.
The existing protection equipment can be classified into a power supply class, a data class and an antenna feeder class according to functions, wherein the power supply class can be classified into a direct current class and an alternating current class, but the protection equipment often has certain limitations and can only protect electromagnetic pulses with specific energy or frequency spectrum, particularly fast pulses with short rising edge time, so that the effect of comprehensive protection cannot be achieved, and the protection efficiency needs to be further improved; if the requirement of the complete protection of the equipment is met, the electromagnetic pulse protection module, the lightning protection module and the EMI filtering module with single functions are required to be additionally arranged on each system of the equipment respectively, and if the equipment is arranged at the same time, the weight and the size of the equipment are greatly influenced, and the equipment is not favorable for the exertion of the fighting performance. Modern military equipment requires miniaturization, integration and lightweight, so the protection scheme has low practicability; the existing protection equipment does not have a detection display function, can not count the times of processing electromagnetic pulses and can not detect the state of the pulse processing module; and the existing protective equipment has poor protective capability for a system with low tolerance capability.
The utility model relates to a strong electromagnetic pulse multi-stage protection device with listen display function, transient state processing module can let into the ground with strong pulse energy, prevents that rear end high energy transient state module of releasing from causing the short circuit to ground of short time after the damage under extreme condition. The steady-state filtering module filters strong pulses coupled into the cable and harmonic clutter of a useless frequency band generated during system operation, and simultaneously further clamps residual voltage processed by the transient processing module to prevent spike pulses in the transient processing module from being coupled into a back-end system; through the coordination of the transient processing module and the steady-state filtering module, the fast pulse coupled with a cable is delayed, and the rising edge time of the fast pulse is reduced, so that a rear-stage system is ensured to have sufficient time to process the pulse. For a system with high tolerance capability, such as a power supply system, after the two stages of processing, the residual voltage of a back-end system can be sensed to meet the requirement, namely the residual voltage cannot damage the back-end system, so that the back-end system can be protected only by the preceding stage transient processing module and the steady-state filtering module. However, for a system with low endurance capacity, such as a communication system, the sensitivity is high, and after the front-end two-stage processing, the system can sense the residual voltage of the back-end system and still cause different damage to the system, so that the back-end transient processing module and the front-end transient processing module need to be designed to cooperate together to protect the system. Compared with various original protective equipment which needs to be independently installed, the device integration level is higher, the size is reduced, the installation space is saved, the cost is greatly reduced, the protective equipment can adapt to various application scenes, the application range of the protective equipment is enlarged, and the protective equipment can be applied to transient strong electromagnetic field environments such as various communication base stations, electric power systems, large pulse power devices, large scientific research institutions, production and processing workshops, test turntables, aircrafts, missile-borne, vehicles-borne, ship-borne, ground control stations, island reefs and the like, so that strong electromagnetic pulses are effectively prevented from invading various systems and equipment, and the continuous and stable operation of the protective equipment is ensured.
Example two
In this embodiment, on the basis of the first embodiment, the preceding-stage transient processing module includes a first protection unit P1, a second protection unit P2, a third protection unit P3, and a fourth protection unit P4, each protection unit includes a high-energy transient protection module F and a high-energy transient discharge module RV therein, one end of the high-energy transient protection module F is an input end of the protection unit where the high-energy transient protection module F is located, the other end of the high-energy transient protection module F is connected with one end of the high-energy transient discharge module RV, and the other end of the high-energy transient discharge module RV is an output end of the protection unit where the high-energy transient protection module RV is located; the input end of the first protection unit P1, the input end of the second protection unit P2 and the input end of the third protection unit P3 are respectively connected with a first phase line L1, a second phase line L2 and a third phase line L3; the output terminal of the first protection unit P1, the output terminal of the second protection unit P2, and the output terminal of the third protection unit P3 are all connected to the ground line PE, the input terminal of the fourth protection unit P4 is connected to the neutral line N, and the output terminal of the fourth protection unit P4 is connected to the ground line PE.
The high-energy transient protection module F is an anti-surge hot-melt resistance wire, the high-energy transient protection modules F1-F4 are all anti-surge hot-melt resistance wires, the anti-surge current of the high-energy transient protection modules is 20kA, and the segmentation capability of the high-energy transient protection modules is 200 kA.
The high-energy transient discharge module RV is formed by serially packaging a fuse and a piezoresistor; the alternating-current starting voltage of the high-energy transient discharge modules RV 1-RV 4 is 275V, and the maximum processing capacity is 40 kA.
The high-energy transient discharge module RV is connected with the system in parallel, when the system works normally, the open-circuit state of the high-energy transient discharge module RV does not influence the normal work of the system, when strong electromagnetic pulse coupling enters the cable, the cable is conducted in a transient state (ns level), so that strong pulse energy (large pulse current and high pulse voltage) is discharged to the ground and is restored to the open-circuit state after the strong pulse energy is discharged to the ground, and the whole treatment process is in a mu s level and does not influence the work of the system.
The high-energy transient protection module F mainly has the functions of preventing short-time ground short circuit caused by the damage of the rear-end high-energy transient discharge module RV under extreme conditions, namely, the rear-end processing module can be switched off in a transient state after being damaged, the normal work of a system is not influenced, and the functions of automatic fault switching-off and failure transient protection are achieved.
EXAMPLE III
In this embodiment, on the basis of the first embodiment, the steady-state filtering module includes a first capacitor bankThe capacitor comprises a first capacitor group, a second capacitor group, a resistor group and an inductor group, wherein the first capacitor group comprises a capacitor Cx1. Capacitor C x2. Capacitor C x3, the second capacitor bank comprises a capacitor Cy1. Capacitor C y2. Capacitor C y3. Capacitor C y4. Capacitor C y5. Capacitor C y6. Capacitor C y7. Capacitor C y8, the resistance group includes resistance R1, resistance R2, resistance R3, and the inductance group includes inductance Lcom1. Inductor L com2, the inductance Lcom1 and inductance LcomEach 2 consists of four windings and a magnetic ring;
the first phase line L1 is sequentially connected with a capacitor Cx1 input terminal, resistor R1 input terminal, inductor Lcom1. Capacitor Cy1 input terminal, inductance L com2. Capacitor C y5, the input ends are connected; the second phase line L2 is sequentially connected with a capacitor C x2, input terminal of resistor R2, inductor Lcom1. Capacitor C y2 input terminal, inductance L com2. Capacitor C y6, the input ends are connected; the third phase line L3 is sequentially connected with a capacitor C x3, input terminal of resistor R3, inductor Lcom1. Capacitor C y3 input terminal, inductance L com2. Capacitor C y7 is connected with the input end; the neutral line N is connected with the capacitor C in sequencex1 output terminal, resistor R1 output terminal, capacitor C x2, an output terminal of the resistor R2, and a capacitor C x3, output terminal of resistor R3, inductor Lcom1. Capacitor C y4 input terminal, inductance L com2. Capacitor C y8, the ground wire PE is connected with the capacitor C in sequencey1 output terminal, capacitor C y2 output terminal, capacitor C y3 output terminal and capacitor C y4 output terminal, capacitor C y5 output terminal, capacitor C y6 output terminal, capacitor C y7 output terminal and capacitor C y8, and an output terminal.
Inductor Lcom1 and inductance L com2 is 4.5mH with a dc resistance of: 0.6 omega.
A first capacitor bank: capacitor Cx1. Capacitor C x2. Capacitor CxThe capacitance value of 3 is 0.047 muF.
A second capacitor bank: capacitor Cy1. Capacitor C y2. Capacitor C y3. Capacitor C y4 has a capacitance of 330 pF; capacitor C y5. Capacitor C y6. Capacitor C y7. Capacitor CyThe capacitance value of 8 is 1.5 nF.
A resistor group: the resistances of the resistor R1, the resistor R2, and the resistor R3 are all 1M Ω.
The steady-state filtering module consists of a filtering device, and the working principle of the steady-state filtering module is basically the same as that of a filter. The main function of the system is to filter out the strong pulse coupled into the cable and the harmonic clutter of the useless frequency band generated during the operation of the system, and further clamp the residual voltage processed by the transient processing module to prevent the spike pulse from being coupled into the back-end system. Through the coordination of the transient processing module and the steady-state filtering module, the fast pulse (mainly unprocessed pulse, the energy of the fast pulse is small, such as the fast pulse with the rising edge less than 5 ns) coupled to a cable is delayed, when the fast pulse is conducted to the module, firstly, most interference pulse (energy) is filtered by the module, the rising edge time of the interference pulse is reduced, secondly, a certain block is formed on other pulse (energy) which cannot be filtered, and the time of conducting the interference pulse to a back-end system is delayed, so that the pulse (energy) is ensured to be processed by the post-stage processing module in sufficient time. The steady-state filtering module further improves the comprehensive protection performance, has high-energy transient absorption prevention capability and carries out ultrafast discharge on the invasion pulse.
Example four
In this embodiment, on the basis of the first embodiment, the post-stage transient processing module includes a first processing unit T1, a second processing unit T2, a third processing unit T3, and a fourth processing unit T4, each of the processing units includes a high-energy transient protection module F and a rear-end high-energy transient discharge module VR, one end of the high-energy transient protection module F is an input end of the processing unit where the post-stage transient protection module F is located, the other end of the high-energy transient protection module F is connected to one end of the rear-end high-energy transient discharge module VR, and the other end of the rear-end high-energy transient discharge module VR is an output end of the processing unit where the post-stage transient protection module F; the input end of the first processing unit T1, the input end of the second processing unit T2 and the input end of the third processing unit T3 are connected with a first phase line L1, a second phase line L2 and a third phase line L3 respectively; the output terminal of the first processing unit T1, the output terminal of the second processing unit T2, and the output terminal of the third processing unit T3 are all connected to the ground line PE, the input terminal of the fourth processing unit T4 is connected to the neutral line N, and the output terminal of the fourth processing unit T4 is connected to the ground line PE.
Anti-surge hot-melt resistance wires are adopted in the high-energy transient protection modules F5-F8, and the anti-surge current is 10 kA; the rear-end high-energy transient discharge modules VR 1-VR 4 all adopt transient suppression diodes, the starting voltage of the transient suppression diodes is 380V, and the maximum processing capacity is 10 kA.
The high-energy transient protection module F in the rear-stage transient processing module has the same action as that of the high-energy transient processing module F in the front-stage transient processing module, namely failure transient protection. The rear-end high-energy transient bleeder module VR has the greatest advantages over the high-energy transient bleeder module RV in the preceding stage transient processing module in its ultra-low clamping voltage and ultra-fast response time. The maximum pulse processing capacity is 10kA, the response time is ps-level, and the energy of the pulse which can be sensed at the position is very small due to the processing of the two stages, so that the large current does not need to be released, and a proper device can be selected for clamping according to the characteristics of a back-end system.
For a system with high tolerance capability, such as a power supply system, after the two stages of processing, the residual voltage of a back-end system can be sensed to meet the requirement, namely the residual voltage cannot damage the back-end system, so that the back-end system can be protected only by the preceding stage transient processing module and the steady-state filtering module. However, for a system with low endurance capacity, such as a communication system, the sensitivity is high, and after the front-end two-stage processing, the system can sense the residual voltage of the back-end system and still cause different damage to the system, so that the back-end transient processing module and the front-end transient processing module need to be designed to cooperate together to protect the system.
EXAMPLE five
In this embodiment, on the basis of the first embodiment, the detection display module includes a housing, and diodes CR1 to CR4, light emitting diodes DS1 to DS5, resistors R4 to R16, optical couplers U1 to U6, capacitors CN1, resistors RN1, inductors L1, nand flip-flop U7, connector P1, ac/dc converters, a single chip microcomputer U8, capacitors C1, capacitors C2, capacitors C3, switches S1, and a display DS6, where a plurality of display resistor groups include resistors R17 to R48;
the shell is grounded, and the input end of the diode CR1, the input end of the diode CR2, the input ends of the diode CR3 and the diode CR4 are connected with the transient processing module;
the output end of the diode CR1 is sequentially connected with the input end 2 of a resistor R4, a resistor R5, a light-emitting diode DS1 and an optocoupler U1; the output end of the diode CR2 is sequentially connected with the input end 2 of the resistor R6, the resistor R7, the light-emitting diode DS2 and the optocoupler U2; the output end of the diode CR3 is sequentially connected with the input end 2 of the resistor R8, the resistor R9, the light-emitting diode DS3 and the optocoupler U3; the output end of the diode CR4 is sequentially connected with the input end 2 of the resistor R10, the resistor R11, the light-emitting diode DS4 and the optocoupler U4; an input end 1 of the optocoupler U1, an input end 1 of the optocoupler U2 and an input end 1 of the optocoupler U3 are connected with a neutral line; the input end 1 of the optocoupler U4 is connected with the transient processing module; the output end 3 of the optocoupler U1, the output end 3 of the optocoupler U2, the output end 3 of the optocoupler U3 and the output end 3 of the optocoupler U4 are respectively connected with the input end 1, the input end 2, the input end 3 and the input end 4 of the NAND gate trigger U7, and the output ends 3 of the optocouplers U1-U4 are also connected with the capacitor CN1 and the resistor RN 1; the output end 4 of the optocoupler U1, the output end 4 of the optocoupler U2, the output end 4 of the optocoupler U3 and the output end 4 of the optocoupler U4 are respectively connected with the input end 14, the input end 5, the input end 6, the input end 11 and the input end 12 of the NAND gate trigger U7, and the output ends 4 of the optocouplers U1-U4 are also connected with the interface 2 of the connector P1 and the interface 1 of the AC-DC converter; the rejection CN1 is connected with the rejection RN1, the input end of the NAND gate trigger U7, the output end of the light emitting diode DS4, the interface 1 of the connector P1 and the interface 2 of the AC-DC converter; the output end 8 of the NAND gate trigger U7 is sequentially connected with a resistor R16 and a light emitting diode DS 5;
the resistor R12, the resistor R13 and the inductor L1 are connected in parallel, one end of the resistor R13 is connected with an interface 1 of an optocoupler U5 and an interface 2 of an optocoupler U6, the other end of the resistor R13 is connected with an interface 2 of an optocoupler U5 and an interface 1 of an optocoupler U6 through a resistor R14, an output end 4 of an optocoupler U5 and an output end 4 of an optocoupler U6 are both connected with an interface 2 of an alternating current-direct current converter, an output end 5 of the optocoupler U5 is connected with an output end 5 of the optocoupler U6 and is connected into the interface 1 of the alternating current-direct current converter and an interface 9 of a connector P1 through a resistor R15, an interface 3 of the alternating current-direct current converter is connected with a first phase line L39;
the interfaces 1-10 and the interfaces 23-26 of the single chip microcomputer U8 are all connected with wires, each wire is connected with a display resistor group, each display resistor group comprises two resistors connected in series, sixteen display resistor groups are respectively a resistor R17 and a resistor R33, a resistor R18 and a resistor R34, a resistor R19 and a resistor R36, a resistor R20 and a resistor R37, a resistor R21 and a resistor R38, a resistor R22 and a resistor R39, a resistor R23 and a resistor R40, a resistor R24 and a resistor R41, a resistor R25 and a resistor R42, a resistor R26 and a resistor R43, a resistor R27 and a resistor R44, a resistor R28 and a resistor R44, a resistor R29 and a resistor R45, a resistor R30 and a resistor R46, a resistor R31 and a resistor R47, a resistor R32 and a resistor R48;
a display DS6 is connected between two resistors of each display resistor group, sixteen display resistor groups are sequentially connected with interfaces 5-16 and interfaces COM 1-COM 4 of the display, the tail ends of twelve wires are all connected into one end of a capacitor C3, and the other end of the capacitor C3 is sequentially connected with a switch S1 and an interface 1 of a connector P1;
the interface 12 of the single chip microcomputer is sequentially connected with one end of a capacitor C1, one end of a capacitor C2 and the interface 2 of a connector P1; the interface 14 of the single chip microcomputer is sequentially connected with the other end of the capacitor C1, the other end of the capacitor C2 and the interface 1 of the connector P1;
and the interface 18 of the singlechip U8 is sequentially connected with the switch S1 and the interface 1 of the connector.
The diode CR1, the diode CR2, the diode CR3 and the diode CR4 adopt a diode of a model number 1N4007, and the parameters are as follows: rated current: 1A, withstand voltage: 700V, forward surge withstand: 30A, average rectified current: 1A, maximum reverse withstand voltage: 1000V, maximum reverse leakage current 5uA, forward voltage drop 1.0V, typical junction capacitance: 15pF, operating temperature: minus 50 ℃ to plus 150 ℃.
The light-emitting diodes DS1, DS2, DS3, DS4 and DS5 are BT344057 type light-emitting diodes, and the parameters are working voltage 12V and red.
The resistance values of the resistors R4-R14 are all 20k omega;
display resistance set: the resistances of the resistors R17 to R28 are all 150k omega, the resistances of the resistors R29 to R32 are all 10k omega, the resistances of the resistors R33 to R44 are all 100k omega, and the resistances of the resistors R45 to R48 are all 47k omega.
The optocouplers U1-U6 are all double-light-emitting diode input type-triode receiving type H11G 1;
exclusion CN1 used C10A104, exclusion RN1 used RN-1081M-334-F-C;
the inductance value of the inductor L1 is 1.5uH under the 100Hz alternating current test;
the resistance values of the resistor R12 and the resistor R13 are both 100 omega, and the resistance value of the resistor R14 is both 47 omega;
the nand flip-flop S1 employs 74HC 30; the connector P1 adopts SZX-14; the AC-DC converter adopts HLK-5M 05.
The singlechip U8 adopts an STC15F2K60S2 singlechip;
the parameters of the capacitor C1 are: 0.1 muF, 50V of working voltage; the parameters of the capacitor C2 are: 47 muF, 25V of working voltage; the parameters of the capacitor C3 are: 47 muF, and the working voltage is 50V;
the switch S1 is a double-pole double-throw switch; display DS6 is an LCD liquid crystal nixie tube display GDC 04520.
The detection display module detects whether the working state of the pulse processing module is intact, counts the times of processing the electromagnetic pulse, and transmits the detected state to the state display module. The user can intuitively know the protection performance of the current protection device and the number of times of the pulse suffered by the current protection device through the module, and support and help can be provided for the improvement and perfection of the subsequent pertinence of a user system.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, and any modifications, equivalents and improvements made by those skilled in the art within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. The utility model provides a multistage protector of strong electromagnetic pulse with listen display function which characterized in that: including phase line L, neutral conductor N, ground wire PE, preceding stage transient state processing module, back level transient state processing module, steady state filtering module and detection display module, phase line L divide into first phase line L1, second phase line L2, third phase line L3, preceding stage transient state processing module, steady state filtering module and back level transient state processing module are connected in proper order to phase line L, neutral conductor N connects gradually preceding stage transient state processing module, steady state filtering module and back level transient state processing module, ground wire PE is connected with preceding stage transient state processing module and back level transient state processing module, be provided with between preceding stage transient state processing module and the back level transient state processing module and listen the display module.
2. The apparatus of claim 1, wherein the multi-stage protection device with detection and display functions comprises: the pre-stage transient processing module comprises a first protection unit P1, a second protection unit P2, a third protection unit P3 and a fourth protection unit P4, each protection unit comprises a high-energy transient protection module F and a high-energy transient discharge module RV, one end of the high-energy transient protection module F is an input end of the protection unit, the other end of the high-energy transient protection module F is connected with one end of the high-energy transient discharge module RV, and the other end of the high-energy transient discharge module RV is an output end of the protection unit; the input end of the first protection unit P1, the input end of the second protection unit P2 and the input end of the third protection unit P3 are respectively connected with a first phase line L1, a second phase line L2 and a third phase line L3; the output terminal of the first protection unit P1, the output terminal of the second protection unit P2, and the output terminal of the third protection unit P3 are all connected to the ground line PE, the input terminal of the fourth protection unit P4 is connected to the neutral line N, and the output terminal of the fourth protection unit P4 is connected to the ground line PE.
3. The apparatus of claim 1, wherein the multi-stage protection device with detection and display functions comprises: the steady-state filtering module comprises a first capacitor bank, a second capacitor bank, a resistor bank and an inductor bank, wherein the first capacitor bank comprises a capacitor Cx1. Capacitor Cx2. Capacitor Cx3, the second capacitor bank comprises a capacitor Cy1. Capacitor Cy2. Capacitor Cy3. Capacitor Cy4. Capacitor Cy5. Capacitor Cy6. Capacitor Cy7. Capacitor Cy8, the resistance group includes resistance R1, resistance R2, resistance R3, and the inductance group includes inductance Lcom1. Inductor Lcom2, the inductance Lcom1 and inductance LcomEach 2 consists of four windings and a magnetic ring;
the first phase line L1 is sequentially connected with a capacitor Cx1 input terminal, resistor R1 input terminal, inductor Lcom1. Capacitor Cy1 input terminal, inductance Lcom2. Capacitor Cy5, the input ends are connected; the second phase line L2 is sequentially connected with a capacitor Cx2, input terminal of resistor R2, inductor Lcom1. Capacitor Cy2 input terminal, inductance Lcom2. Capacitor Cy6, the input ends are connected; the third phase line L3 is sequentially connected with a capacitor Cx3, input terminal of resistor R3, inductor Lcom1. Capacitor Cy3 input terminal, inductance Lcom2. Capacitor Cy7 is connected with the input end; the neutral line N is connected with the capacitor C in sequencex1 output terminal, resistor R1 output terminal, capacitor Cx2, an output terminal of the resistor R2, and a capacitor Cx3, output terminal of resistor R3, inductor Lcom1. Capacitor Cy4 input terminal, inductance Lcom2. Capacitor Cy8, the ground wire PE is connected with the capacitor C in sequencey1 output terminal, capacitor Cy2 output terminal, capacitor Cy3 output terminal and capacitor Cy4 ofOutput terminal and capacitor Cy5 output terminal, capacitor Cy6 output terminal, capacitor Cy7 output terminal and capacitor Cy8, and an output terminal.
4. The apparatus of claim 1, wherein the multi-stage protection device with detection and display functions comprises: the rear-stage transient processing module comprises a first processing unit T1, a second processing unit T2, a third processing unit T3 and a fourth processing unit T4, each processing unit comprises a high-energy transient protection module F and a rear-end high-energy transient discharge module VR, one end of the high-energy transient protection module F is an input end of the processing unit, the other end of the high-energy transient protection module F is connected with one end of the rear-end high-energy transient discharge module VR, and the other end of the rear-end high-energy transient discharge module VR is an output end of the processing unit; the input end of the first processing unit T1, the input end of the second processing unit T2 and the input end of the third processing unit T3 are connected with a first phase line L1, a second phase line L2 and a third phase line L3 respectively; the output terminal of the first processing unit T1, the output terminal of the second processing unit T2, and the output terminal of the third processing unit T3 are all connected to the ground line PE, the input terminal of the fourth processing unit T4 is connected to the neutral line N, and the output terminal of the fourth processing unit T4 is connected to the ground line PE.
5. The apparatus of claim 1, wherein the multi-stage protection device with detection and display functions comprises: the detection display module comprises a shell, diodes CR 1-CR 4, light emitting diodes DS 1-DS 5, resistors R4-R16, optical couplers U1-U6, a capacitor CN1, a resistor RN1, an inductor L1, a NAND gate trigger U7, a connector P1, an alternating current-direct current converter, a singlechip U8, a capacitor C1, a capacitor C2, a capacitor C3, a switch S1, a display DS6 and a plurality of display resistor groups;
the shell is grounded, and the input end of the diode CR1, the input end of the diode CR2, the input end of the diode CR3 and the input end of the diode CR4 are connected with the transient processing module;
the output end of the diode CR1 is sequentially connected with the input end 2 of a resistor R4, a resistor R5, a light-emitting diode DS1 and an optocoupler U1; the output end of the diode CR2 is sequentially connected with the input end 2 of the resistor R6, the resistor R7, the light-emitting diode DS2 and the optocoupler U2; the output end of the diode CR3 is sequentially connected with the input end 2 of the resistor R8, the resistor R9, the light-emitting diode DS3 and the optocoupler U3; the output end of the diode CR4 is sequentially connected with the input end 2 of the resistor R10, the resistor R11, the light-emitting diode DS4 and the optocoupler U4; an input end 1 of the optocoupler U1, an input end 1 of the optocoupler U2 and an input end 1 of the optocoupler U3 are connected with a neutral line; the input end 1 of the optocoupler U4 is connected with the transient processing module; the output end 3 of the optocoupler U1, the output end 3 of the optocoupler U2, the output end 3 of the optocoupler U3 and the output end 3 of the optocoupler U4 are respectively connected with the input end 1, the input end 2, the input end 3 and the input end 4 of the NAND gate trigger U7, and the output ends 3 of the optocouplers U1-U4 are also connected with the capacitor CN1 and the resistor RN 1; the output end 4 of the optocoupler U1, the output end 4 of the optocoupler U2, the output end 4 of the optocoupler U3 and the output end 4 of the optocoupler U4 are respectively connected with the input end 14, the input end 5, the input end 6, the input end 11 and the input end 12 of the NAND gate trigger U7, and the output ends 4 of the optocouplers U1-U4 are also connected with the interface 2 of the connector P1 and the interface 1 of the AC-DC converter; the rejection CN1 is connected with the rejection RN1, the input end of the NAND gate trigger U7, the output end of the light emitting diode DS4, the interface 1 of the connector P1 and the interface 2 of the AC-DC converter; the output end 8 of the NAND gate trigger U7 is sequentially connected with a resistor R16 and a light emitting diode DS 5;
the resistor R12, the resistor R13 and the inductor L1 are connected in parallel, one end of the resistor R13 is connected with an interface 1 of an optocoupler U5 and an interface 2 of an optocoupler U6, the other end of the resistor R13 is connected with an interface 2 of an optocoupler U5 and an interface 1 of an optocoupler U6 through a resistor R14, an output end 4 of an optocoupler U5 and an output end 4 of an optocoupler U6 are both connected with an interface 2 of an alternating current-direct current converter, an output end 5 of the optocoupler U5 is connected with an output end 5 of the optocoupler U6 and is connected into the interface 1 of the alternating current-direct current converter and an interface 9 of a connector P1 through a resistor R15, an interface 3 of the alternating current-direct current converter is connected with a first phase line L39;
the interfaces 1-10 and 23-26 of the single chip microcomputer U8 are all connected with wires, each wire is connected with a display resistor group, each display resistor group comprises two resistors connected in series, a display DS6 is connected between the two resistors of each display resistor group, the tail ends of the sixteen wires are all connected into one end of a capacitor C3, and the other end of the capacitor C3 is sequentially connected with a switch S1 and an interface 1 of a connector P1;
the interface 12 of the single chip microcomputer is sequentially connected with one end of a capacitor C1, one end of a capacitor C2 and the interface 2 of a connector P1; the interface 14 of the single chip microcomputer is sequentially connected with the other end of the capacitor C1, the other end of the capacitor C2 and the interface 1 of the connector P1;
and the interface 18 of the singlechip U8 is sequentially connected with the switch S1 and the interface 1 of the connector.
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