An automatic early warning optical cable cross-connect cabinet

Abstract

The utility model discloses an automatic early warning optical cable junction box belongs to optical cable junction box technical field, solved the optical cable junction box when using in dry windy sand environment, the box body and the wind rubs the static charge and is difficult to dissipate, and the discharge produces the EMP coupling into the in -house optical fiber patch cord, passes through the connector discharge burnout far -end or user end optical module, causes the light equipment port offline, inserts new module and is damaged again, the problem of fault concealment is difficult to trace back, causes module repeated damage, service interruption. Including box body and setting in the static discharge remote monitoring and suppression circuit in the box body, the static discharge remote monitoring and suppression circuit includes multiband electromagnetic pulse detection module, difference formula ground current monitoring module. The utility model discloses through real -time monitoring the electromagnetic pulse and ground current change around the box body, analyzes and judges static discharge event, and synchronous starting remote alarm signal transmission and initiative charge discharge mechanism, realizes the overall protection and intelligent inhibition to static harm.

Description

Technical Field

[0001] This utility model relates to the field of optical cable junction box technology, and in particular to an automatic early warning optical cable junction box. Background Technology

[0002] Fiber optic junction boxes are core devices in optical access networks, connecting backbone and distribution optical cables. They are primarily used for optical cable splicing, splitting, and distribution. The outer casing is typically made of corrosion-resistant metal or engineering plastic, with an IP65 or higher protection rating, suitable for outdoor pole-mounted and ground-mounted installations. The box integrates fusion splicing units, splitting modules, and patch cord interfaces, enabling flexible optical signal distribution, supporting multi-user access and future expansion, providing stable switching for end-point access in the optical network, and ensuring link transmission reliability.

[0003] When optical cable junction boxes are used in dry, windy, and sandy environments, static charge accumulates due to friction between the box and strong winds and is difficult to dissipate. The EMP generated by the instantaneous discharge of static charge couples into the optical fiber patch cords inside the box and discharges through the patch cord connectors. The high temperature and electromagnetic interference burn out the optical modules at the remote or user end, ultimately leading to the optical equipment ports being taken offline and damaged again when a new module is inserted. The fault is hidden and difficult to trace, resulting in repeated module damage and service interruption.

[0004] Therefore, an automatic early warning optical cable junction box is proposed to solve or alleviate the above problems. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of existing technologies by proposing an automatic early warning optical cable junction box.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An automatic early warning optical cable junction box includes a box body and an electrostatic discharge remote monitoring and suppression circuit installed inside the box body. The electrostatic discharge remote monitoring and suppression circuit includes a multi-band electromagnetic pulse detection module, a differential grounding current monitoring module, an adaptive threshold control module, a multi-level signal processing module, an intelligent discharge control module, and a power line carrier communication module. The signal output terminal of the multi-band electromagnetic pulse detection module is connected to the input terminal of the multi-level signal processing module. The signal output terminal of the differential grounding current monitoring module is connected to the input terminal of the multi-level signal processing module. The control signal output terminal of the adaptive threshold control module is connected to the threshold control terminal of the multi-level signal processing module. The decision signal output terminal of the multi-level signal processing module is connected to the input terminal of the power line carrier communication module and the trigger terminal of the intelligent discharge control module. The signal coupling terminal of the power line carrier communication module is grounded.

[0008] Preferably, the multi-band electromagnetic pulse detection module includes a first radio frequency transistor, a second radio frequency transistor, a third radio frequency transistor, a first detector diode, a second detector diode, and a third detector diode, a first resistor, a second resistor, and a third resistor. The base of the first radio frequency transistor receives antenna signals through a first capacitor. The collector of the first radio frequency transistor is connected to the anode of the first detector diode. The emitter of the first radio frequency transistor is grounded. The cathode of the first detector diode is connected to one end of the first resistor. The base of the second radio frequency transistor receives antenna signals through a second capacitor. The collector of the second radio frequency transistor is connected to the anode of the second detector diode. The emitter of the second radio frequency transistor is grounded. The cathode of the second detector diode is connected to one end of the second resistor. The base of the third radio frequency transistor receives antenna signals through a third capacitor. The collector of the third radio frequency transistor is connected to the anode of the third detector diode. The emitter of the third radio frequency transistor is grounded. The cathode of the third detector diode is connected to one end of the third resistor. The other ends of the first resistor, the second resistor, and the third resistor are connected together to form a signal aggregation output point.

[0009] Preferably, the differential grounding current monitoring module includes a first current transformer, a second current transformer, and an INA214 differential amplifier. The primary side of the first current transformer is grounded, and the secondary output terminal of the first current transformer is connected to the non-inverting input terminal of the INA214 differential amplifier. The primary side of the second current transformer is grounded, and the secondary output terminal of the second current transformer is connected to the inverting input terminal of the INA214 differential amplifier. The reference terminal of the INA214 differential amplifier is grounded through a fourth resistor. The positive power supply terminal of the INA214 differential amplifier is energized, and the negative power supply terminal of the INA214 differential amplifier is grounded. The output terminal of the INA214 differential amplifier is connected to the input terminal of the multi-stage signal processing module through a coupling capacitor.

[0010] Preferably, the adaptive threshold control module includes a dot-bar display driver LM3914 and a CD4066 analog switch. The signal input terminal of the dot-bar display driver LM3914 is connected to the signal aggregation output point in the multi-band electromagnetic pulse detection module. An adjustable resistor is connected between the low reference voltage terminal and the high reference voltage terminal of the dot-bar display driver LM3914. The first output terminal of the dot-bar display driver LM3914 is connected to the first control terminal of the CD4066 analog switch. The tenth output terminal of the dot-bar display driver LM3914 is connected to the fourth control terminal of the CD4066 analog switch. The first switching channel of the CD4066 analog switch is connected in parallel to the first threshold network of the multi-level signal processing module. The fourth switching channel of the CD4066 analog switch is connected in parallel to the second threshold network of the multi-level signal processing module.

[0011] Preferably, the multi-stage signal processing module includes a first comparator LT1016, an LM318 operational amplifier, a CD4046 phase-locked loop, and a second comparator LM311. The non-inverting input of the first comparator LT1016 is connected to the signal aggregation input point in the multi-band electromagnetic pulse detection module. The inverting input of the first comparator LT1016 is connected to a first threshold network. The output of the first comparator LT1016 is connected to the non-inverting input of the LM318 operational amplifier. The output of the LM318 operational amplifier is connected to the signal input of the CD4046 phase-locked loop. The comparator output of the CD4046 phase-locked loop is connected to the non-inverting input of the second comparator LM311. The inverting input of the second comparator LM311 is connected to a second threshold network. The output of the second comparator LM311 is set as a decision signal output.

[0012] Preferably, the power line carrier communication module includes an ST7540 power line modem chip, a coupling transformer, and a driving transistor. The transmit data terminal of the ST7540 power line modem chip is connected to the decision signal output terminal. The power supply terminal of the ST7540 power line modem chip is powered on, and the ground terminal of the ST7540 power line modem chip is grounded. The line interface terminal of the ST7540 power line modem chip is connected to the primary side of the coupling transformer through a fourth capacitor. The base of the driving transistor is connected to the transmit enable terminal of the ST7540 power line modem chip through a fifth resistor. The emitter of the driving transistor is grounded, and the collector of the driving transistor is connected to the primary center tap of the coupling transformer. The secondary side of the coupling transformer is grounded.

[0013] Preferably, the intelligent discharge control module includes an optocoupler and a thyristor. The anode input terminal of the optocoupler is connected to the decision signal output terminal through a sixth resistor, the cathode input terminal of the optocoupler is grounded, the output terminal of the optocoupler is connected to the gate of the thyristor through a seventh resistor, the anode of the thyristor is connected to the housing, and the cathode of the thyristor is grounded.

[0014] This utility model has the following beneficial effects:

[0015] This invention achieves comprehensive protection and intelligent suppression of electrostatic hazards by real-time monitoring of electromagnetic pulses and grounding current changes around the enclosure, analyzing and judging electrostatic discharge events, and simultaneously activating remote alarm signal transmission and active charge discharge mechanisms. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a structural block diagram of the electrostatic discharge remote monitoring and suppression circuit in this utility model.

[0019] In the diagram: 1. Housing; 2. Multi-band electromagnetic pulse detection module; 3. Differential grounding current monitoring module; 4. Adaptive threshold control module; 5. Multi-level signal processing module; 6. Intelligent discharge control module; 7. Power line carrier communication module. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] Furthermore, the terms "first," "second," and "third" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0025] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] An automatic early warning optical cable junction box, such as Figure 1 and Figure 2 As shown, the system includes a housing 1 and an electrostatic discharge remote monitoring and suppression circuit installed inside the housing 1. The electrostatic discharge remote monitoring and suppression circuit includes a multi-band electromagnetic pulse detection module 2, a differential grounding current monitoring module 3, an adaptive threshold control module 4, a multi-level signal processing module 5, an intelligent discharge control module 6, and a power line carrier communication module 7. The signal output terminal of the multi-band electromagnetic pulse detection module 2 is connected to the input terminal of the multi-level signal processing module 5. The signal output terminal of the differential grounding current monitoring module 3 is connected to the input terminal of the multi-level signal processing module 5. The control signal output terminal of the adaptive threshold control module 4 is connected to the threshold control terminal of the multi-level signal processing module 5. The decision signal output terminal of the multi-level signal processing module 5 is connected to the input terminal of the power line carrier communication module 7 and the trigger terminal of the intelligent discharge control module 6. The signal coupling terminal of the power line carrier communication module 7 is grounded.

[0027] The multi-band electromagnetic pulse detection module 2 includes a first radio frequency transistor, a second radio frequency transistor, a third radio frequency transistor, a first detector diode, a second detector diode, and a third detector diode, a first resistor, a second resistor, and a third resistor. The base of the first radio frequency transistor receives antenna signals through a first capacitor. The collector of the first radio frequency transistor is connected to the anode of the first detector diode, and the emitter of the first radio frequency transistor is grounded. The cathode of the first detector diode is connected to one end of the first resistor. The base of the second radio frequency transistor receives antenna signals through a second capacitor. The collector of the second radio frequency transistor is connected to the anode of the second detector diode, and the emitter of the second radio frequency transistor is grounded. The cathode of the second detector diode is connected to one end of the second resistor. The base of the third radio frequency transistor receives antenna signals through a third capacitor. The collector of the third radio frequency transistor is connected to the anode of the third detector diode, and the emitter of the third radio frequency transistor is grounded. The cathode of the third detector diode is connected to one end of the third resistor. The other ends of the first resistor, the second resistor, and the third resistor are connected together to form a signal aggregation output point.

[0028] The differential grounding current monitoring module 3 includes a first current transformer, a second current transformer, and an INA214 differential amplifier. The primary side of the first current transformer is grounded, and the secondary output terminal of the first current transformer is connected to the non-inverting input terminal of the INA214 differential amplifier. The primary side of the second current transformer is grounded, and the secondary output terminal of the second current transformer is connected to the inverting input terminal of the INA214 differential amplifier. The reference terminal of the INA214 differential amplifier is grounded through a fourth resistor. The positive power supply terminal of the INA214 differential amplifier is energized, and the negative power supply terminal of the INA214 differential amplifier is grounded. The output terminal of the INA214 differential amplifier is connected to the input terminal of the multi-stage signal processing module 5 through a coupling capacitor.

[0029] The adaptive threshold control module 4 includes a dot-bar display driver LM3914 and a CD4066 analog switch. The signal input terminal of the dot-bar display driver LM3914 is connected to the signal aggregation output point in the multi-band electromagnetic pulse detection module 2. An adjustable resistor is connected between the low reference voltage terminal and the high reference voltage terminal of the dot-bar display driver LM3914. The first output terminal of the dot-bar display driver LM3914 is connected to the first control terminal of the CD4066 analog switch. The tenth output terminal of the dot-bar display driver LM3914 is connected to the fourth control terminal of the CD4066 analog switch. The first switching channel of the CD4066 analog switch is connected in parallel to the first threshold network of the multi-level signal processing module 5. The fourth switching channel of the CD4066 analog switch is connected in parallel to the second threshold network of the multi-level signal processing module 5.

[0030] The multi-stage signal processing module 5 includes a first comparator LT1016, an LM318 operational amplifier, a CD4046 phase-locked loop (PLL), and a second comparator LM311. The non-inverting input of the first comparator LT1016 is connected to the signal aggregation input point in the multi-band electromagnetic pulse detection module 2. The inverting input of the first comparator LT1016 is connected to a first threshold network. The output of the first comparator LT1016 is connected to the non-inverting input of the LM318 operational amplifier. The output of the LM318 operational amplifier is connected to the signal input of the CD4046 PLL. The comparator output of the CD4046 PLL is connected to the non-inverting input of the second comparator LM311. The inverting input of the second comparator LM311 is connected to the second threshold network. The output of the second comparator LM311 is set as the decision signal output. The first threshold network includes an eighth resistor and a ninth resistor, which are connected in series. One end of the eighth resistor is energized, and the other end of the ninth resistor is grounded. The connection point between the eighth and ninth resistors is connected to the inverting input of the first comparator LT1016. The second threshold network includes a tenth resistor and an eleventh resistor, which are connected in series. One end of the tenth resistor is energized, and the other end of the eleventh resistor is grounded. The connection point between the tenth and eleventh resistors is connected to the inverting input of the second comparator LM311.

[0031] The power line carrier communication module 7 includes an ST7540 power line modem chip, a coupling transformer, and a drive transistor. The transmit data terminal of the ST7540 power line modem chip is connected to the decision signal output terminal. The power supply terminal of the ST7540 power line modem chip is powered on, and the ground terminal of the ST7540 power line modem chip is grounded. The line interface terminal of the ST7540 power line modem chip is connected to the primary side of the coupling transformer through a fourth capacitor. The base of the drive transistor is connected to the transmit enable terminal of the ST7540 power line modem chip through a fifth resistor. The emitter of the drive transistor is grounded, and the collector of the drive transistor is connected to the primary center tap of the coupling transformer. The secondary side of the coupling transformer is grounded.

[0032] The intelligent discharge control module 6 includes an optocoupler and a thyristor. The anode input terminal of the optocoupler is connected to the decision signal output terminal through a sixth resistor, the cathode input terminal of the optocoupler is grounded, and the output terminal of the optocoupler is connected to the gate of the thyristor through a seventh resistor. The anode of the thyristor is connected to the housing 1, and the cathode of the thyristor is grounded.

[0033] In specific operation, the multi-band electromagnetic pulse detection module 2 and the differential grounding current monitoring module 3 work together to monitor the electromagnetic pulse signal radiated from space. When the surface of the optical cable junction box 1 is rubbed by strong wind and static charge accumulates and forms a momentary discharge, the multi-band electromagnetic pulse detection module 2 captures the electromagnetic pulse signal radiated from space through its whip antenna with three parallel channels of high frequency, medium frequency and low frequency. After being pre-amplified by the first radio frequency transistor, the second radio frequency transistor and the third radio frequency transistor, the signal is rectified into a DC signal by the first detector diode, the second detector diode and the third detector diode, and then collected to the signal output point through a resistor. At the same time, the differential grounding current monitoring module 3 monitors the differential change of the current on the grounding wire in real time through the first current transformer and the second current transformer connected in series, and sends the detected differential signal to the differential amplifier for amplification. The two signals are input to the input terminal of the multi-stage signal processing module 5.

[0034] Meanwhile, the adaptive threshold control module 4 analyzes the ambient noise level in real time through the dot-bar display driver and drives the analog switch to dynamically adjust the threshold network resistance value of the multi-level signal processing module 5, thereby ensuring that the detection system can maintain the best sensitivity under different environmental conditions. The multi-level signal processing module 5 first performs preliminary threshold judgment on the input signal through the first comparator, then filters out noise through the active bandpass filter composed of operational amplifiers, then performs frequency locking and verification through the phase-locked loop, and finally makes a decision by the second comparator and outputs a high-level trigger signal.

[0035] The trigger signal is simultaneously sent to the power line carrier communication module 7 and the intelligent discharge control module 6. The power line carrier communication module 7 modulates the alarm signal through the power line modem chip, amplifies it through the drive transistor and isolates it through the coupling transformer, and uses the grounding line itself as the transmission medium to remotely send the alarm information to the monitoring center.

[0036] The intelligent discharge control module 6 uses an optocoupler to isolate the trigger signal and drive the thyristor to conduct, so that the static charge accumulated in the box 1 can be safely discharged to the ground through the anode-to-cathode path of the thyristor, thereby eliminating the source of danger before a violent discharge occurs.

[0037] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An automatic early warning optical cable junction box, characterized in that, The system includes a housing (1) and a remote electrostatic discharge monitoring and suppression circuit installed inside the housing (1). The remote electrostatic discharge monitoring and suppression circuit includes a multi-band electromagnetic pulse detection module (2), a differential grounding current monitoring module (3), an adaptive threshold control module (4), a multi-level signal processing module (5), an intelligent discharge control module (6), and a power line carrier communication module (7). The signal output terminal of the multi-band electromagnetic pulse detection module (2) is connected to the input terminal of the multi-level signal processing module (5). The signal output terminal of the differential grounding current monitoring module (3) is connected to the input terminal of the multi-level signal processing module (5). The control signal output terminal of the adaptive threshold control module (4) is connected to the threshold control terminal of the multi-level signal processing module (5). The decision signal output terminal of the multi-level signal processing module (5) is connected to the input terminal of the power line carrier communication module (7) and the trigger terminal of the intelligent discharge control module (6). The signal coupling terminal of the power line carrier communication module (7) is grounded.

2. The automatic early warning optical cable junction box according to claim 1, characterized in that, The multi-band electromagnetic pulse detection module (2) includes a first radio frequency transistor, a second radio frequency transistor, a third radio frequency transistor, a first detector diode, a second detector diode, and a third detector diode, a first resistor, a second resistor, and a third resistor. The base of the first radio frequency transistor receives antenna signals through a first capacitor. The collector of the first radio frequency transistor is connected to the anode of the first detector diode. The emitter of the first radio frequency transistor is grounded. The cathode of the first detector diode is connected to one end of the first resistor. The base of the second radio frequency transistor receives antenna signals through a second capacitor. The collector of the second radio frequency transistor is connected to the anode of the second detector diode. The emitter of the second radio frequency transistor is grounded. The cathode of the second detector diode is connected to one end of the second resistor. The base of the third radio frequency transistor receives antenna signals through a third capacitor. The collector of the third radio frequency transistor is connected to the anode of the third detector diode. The emitter of the third radio frequency transistor is grounded. The cathode of the third detector diode is connected to one end of the third resistor. The other ends of the first resistor, the second resistor, and the third resistor are connected together to form a signal aggregation output point.

3. An automatic early warning optical cable junction box according to claim 1, characterized in that, The differential grounding current monitoring module (3) includes a first current transformer, a second current transformer, and an INA214 differential amplifier. The primary side of the first current transformer is grounded, and the secondary output terminal of the first current transformer is connected to the non-inverting input terminal of the INA214 differential amplifier. The primary side of the second current transformer is grounded, and the secondary output terminal of the second current transformer is connected to the inverting input terminal of the INA214 differential amplifier. The reference terminal of the INA214 differential amplifier is grounded through a fourth resistor. The positive power supply terminal of the INA214 differential amplifier is powered on, and the negative power supply terminal of the INA214 differential amplifier is grounded. The output terminal of the INA214 differential amplifier is connected to the input terminal of the multi-stage signal processing module (5) through a coupling capacitor.

4. An automatic early warning optical cable junction box according to claim 1, characterized in that, The adaptive threshold control module (4) includes a dot-bar display driver LM3914 and a CD4066 analog switch. The signal input terminal of the dot-bar display driver LM3914 is connected to the signal aggregation output point in the multi-band electromagnetic pulse detection module (2). An adjustable resistor is connected between the low reference voltage terminal and the high reference voltage terminal of the dot-bar display driver LM3914. The first output terminal of the dot-bar display driver LM3914 is connected to the first control terminal of the CD4066 analog switch. The tenth output terminal of the dot-bar display driver LM3914 is connected to the fourth control terminal of the CD4066 analog switch. The first switching channel of the CD4066 analog switch is connected in parallel to the first threshold network of the multi-level signal processing module (5). The fourth switching channel of the CD4066 analog switch is connected in parallel to the second threshold network of the multi-level signal processing module (5).

5. An automatic early warning optical cable junction box according to claim 1, characterized in that, The multi-level signal processing module (5) includes a first comparator LT1016, an LM318 operational amplifier, a CD4046 phase-locked loop, and a second comparator LM311. The non-inverting input of the first comparator LT1016 is connected to the signal aggregation input point in the multi-band electromagnetic pulse detection module (2). The inverting input of the first comparator LT1016 is connected to a first threshold network. The output of the first comparator LT1016 is connected to the non-inverting input of the LM318 operational amplifier. The output of the LM318 operational amplifier is connected to the signal input of the CD4046 phase-locked loop. The comparator output of the CD4046 phase-locked loop is connected to the non-inverting input of the second comparator LM311. The inverting input of the second comparator LM311 is connected to a second threshold network. The output of the second comparator LM311 is set as a decision signal output.

6. An automatic early warning optical cable junction box according to claim 1, characterized in that, The power line carrier communication module (7) includes an ST7540 power line modem chip, a coupling transformer, and a driving transistor. The transmit data terminal of the ST7540 power line modem chip is connected to the decision signal output terminal. The power supply terminal of the ST7540 power line modem chip is powered on. The ground terminal of the ST7540 power line modem chip is grounded. The line interface terminal of the ST7540 power line modem chip is connected to the primary side of the coupling transformer through a fourth capacitor. The base of the driving transistor is connected to the transmit enable terminal of the ST7540 power line modem chip through a fifth resistor. The emitter of the driving transistor is grounded. The collector of the driving transistor is connected to the primary center tap of the coupling transformer. The secondary side of the coupling transformer is grounded.

7. An automatic early warning optical cable junction box according to claim 1, characterized in that, The intelligent discharge control module (6) includes an optocoupler and a thyristor. The anode input terminal of the optocoupler is connected to the decision signal output terminal through a sixth resistor. The cathode input terminal of the optocoupler is grounded. The output terminal of the optocoupler is connected to the gate of the thyristor through a seventh resistor. The anode of the thyristor is connected to the housing (1), and the cathode of the thyristor is grounded.

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