94 results about "Transient-voltage-suppression diode" patented technology

The invention relates to the technical field of anti-electromagnetic interference, and provides a Type-C interface power supply surge protection design method. Comprising a Type-C interface power supply, and the Type-C interface power supply is composed of a Type-C interface, a transient suppression diode D4 and a chip end. The design method comprises the steps of obtaining an initial circuit schematic diagram and a surge protection requirement of a Type-C interface, and determining rated voltage, rated power and response time of the Type-C interface; determining a first electrical characteristic that the Type-C interface generates low-voltage surge interference according to the rated voltage and the rated power, and configuring multiple TVS transient voltage suppressor diodes at the output end of the Type-C interface to generate a first circuit schematic diagram; acquiring a second electrical characteristic after the configuration of the multiple TVS transient voltage suppressor diodes, and configuring a plurality of common-mode inductance filters at the output ends of the multiple TVS transient voltage suppressor diodes to generate a second circuit schematic diagram; and according to the second circuit schematic diagram, generating a Type-C interface to be verified, and performing a low-voltage surge test.

The application discloses a kind of excitation control circuit with multiple de-excitation loop for aviation three-stage power generation system, including: resonant de-excitation capacitor C2, de-excitation switch S1, de-excitation switch S2, anti-reverse diode D1, freewheeling diode D2, freewheeling diode D3, transient voltage suppression diode D4, voltage regulating MOS tube Q1, voltage regulating MOS tube Q2, de-excitation resistor R1 and excitation winding L;Wherein, the positive terminal of DC power supply DC+ is connected to the anode of anti-reverse diode D1, the cathode of anti-reverse diode D1 is sequentially connected to the negative terminal of DC power supply DC- by de-excitation switch S1 and resonant de-excitation capacitor C2;The cathode of anti-reverse diode D1 is respectively connected to the drain of voltage regulating MOS tube Q1, the negative electrode of freewheeling diode D3 and one end of de-excitation switch S2, the source of voltage regulating MOS tube Q1 is respectively connected to the positive electrode F+ of excitation winding L, the negative electrode of freewheeling diode D2;The anode of freewheeling diode D3 is respectively connected to the negative electrode F- of excitation winding L, the drain of voltage regulating MOS tube Q2 and the negative electrode of transient voltage suppression diode D4, the other end of de-excitation switch S2 is respectively connected to the positive electrode of transient voltage suppression diode D4 and one end of de-excitation resistor R1;The anode of freewheeling diode D2, the source of voltage regulating MOS tube Q2 and the other end of de-excitation resistor R1 are respectively connected to the negative terminal of DC power supply DC-.The technical scheme of the application solves the problem that the freewheeling diode added between excitation voltages in the existing excitation circuit cannot consume the energy of magnetic field, and the de-excitation speed is slow.

The invention provides a power panel assembly based on output noise suppression and ripple attenuation. The power panel assembly comprises an input EMI electromagnetic compatibility module, a core power conversion module and an output noise suppression module. The input EMI electromagnetic compatibility module comprises a composite anti-surge circuit, the composite anti-surge circuit is formed by connecting a transient voltage suppressor diode, a metal oxide varistor and a self-recovery fuse in series, the clamping voltage of the transient voltage suppressor diode is 85 V, the peak power consumption is larger than or equal to 1500 W, the nominal voltage of the metal oxide varistor is 100 V, and the self-recovery fuse is connected with the transient voltage suppressor diode. The through-flow capacity is greater than or equal to 5kA; the core power conversion module comprises an isolation DC / DC power conversion unit and a three-dimensional stacked LC filter circuit, and the isolation DC / DC power conversion unit comprises at least one hot backup module, supports 9-36V input voltage and outputs multiple independent voltages.

The invention discloses an absorption circuit for a multi-path parallel flyback switching power supply MOS (Metal Oxide Semiconductor) tube, which is used for controlling voltage between a drain electrode and a source electrode of the MOS tube and comprises a first flyback circuit, a second flyback circuit and an absorption circuit, and the first flyback circuit and the second flyback circuit are connected in parallel and are connected to an output end of the absorption circuit; and the high-frequency capacitors C101 and C103 respectively form a loop with the primary side leakage inductance Lm of the transformer in the first flyback circuit and the second flyback circuit, so that the voltage amplitude generated by resonance of the leakage inductance Lm and the parasitic capacitance Coss of the MOS tube is reduced. Meanwhile, fast recovery diodes D102 and D104 are conducted, so that a high-frequency capacitor C102 absorbs voltage energy, a transient voltage suppression diode D101 performs voltage clamping, and terminal voltage of an MOS tube in the flyback circuit is controlled. The circuit is verified by an actual multi-path parallel flyback switching power supply, the work is stable and reliable, the stress control effect of the MOS tube is good, and the cost is relatively low.

According to the three-phase three-wire current acquisition circuit adaptive to the distribution network terminal and the control method, the three-phase three-wire current acquisition circuit comprises a current acquisition circuit, a signal amplification circuit, a metering and processing circuit, an operational amplifier and a multi-stage anti-interference design, and conversion from large current to small current is realized through elements such as a current transformer, a magnetic bead, a transient voltage suppression diode and a sampling resistor; current signals are converted into voltage signals, and electromagnetic interference and high-frequency noise are effectively suppressed; the precision and the amplitude of the signal are improved; data storage, processing and communication are achieved through the electric energy metering chip, the MCU, the resistor, the capacitor and other elements, the precision and reliability of current collection are remarkably improved through multi-level signal processing and anti-interference design, the reference requirements in the complex electromagnetic environment can be effectively met, and high-quality current data support is provided for power distribution network terminal equipment; the current collector is widely applied to a distribution network terminal unit and a power management system, and can complete a current accurate collection task in a complex electromagnetic environment.

The utility model discloses a kind of drive circuits, belong to electric bicycle instrument technical field, specifically related to a kind of electric bicycle instrument drive circuit, comprising: conversion module, output filter and high voltage surge suppression module;Output filter and high voltage surge suppression module are connected with conversion module;Conversion module includes: MOS tube Q6, MOS tube Q9, resistance R20, resistance R19, resistance R18, triode Q5 and triode Q10;Output filter includes: inductance L2, electrolytic capacitor C15, electrolytic capacitor C14, capacitor C13;High voltage surge suppression module includes: transient voltage suppression diode D5;The utility model uses wide input voltage range, high-efficiency switching power supply, replaces traditional linear voltage stabilizer, and efficiency is higher, and heat is smaller, and tolerance to input voltage fluctuation is better, while increasing greater capacity input electrolytic capacitor, effectively absorb transient surge and fill transient voltage drop, in addition, TVS diode is used to suppress high voltage surge, and self-recovery fuse is used to prevent overcurrent.

The utility model discloses a surge protection circuit, a controller, a battery management system, power distribution equipment and a vehicle. The surge protection circuit comprises a first transient voltage suppressor diode and a second transient voltage suppressor diode, the anode of the first transient voltage suppressor diode is connected with the anode of the second transient voltage suppressor diode, and the cathode of the first transient voltage suppressor diode is suitable for being connected with the anode end of a power supply. The cathode of the second transient voltage suppression diode is suitable for being connected with the negative terminal of the power supply and the first grounding terminal. According to the surge protection circuit, when a positive surge occurs and the first transient voltage suppressor diode is broken down, the second transient voltage suppressor diode can serve as a common diode to be conducted, surge voltage is discharged from the first grounding end, and when a negative surge occurs and the second transient voltage suppressor diode is broken down, the surge voltage is discharged from the second grounding end. And the first transient voltage suppression diode can be conducted as a common diode, so that the surge resistance of a subsequent circuit can be improved.

The present invention relates to a sequential release surge protector, comprising a wave head absorption channel, a wavelength pre-emission channel, and an energy release channel. The wave head absorption channel comprises a transient voltage suppression diode (TVS) and a first zinc oxide varistor (M0). The transient voltage suppression diode (TVS) is connected in series with the first zinc oxide varistor (M0), and the other end of the first zinc oxide varistor (M0) is grounded. A second zinc oxide varistor (M1) is connected in parallel to both ends of the transient voltage suppression diode (TVS). The second zinc oxide varistor (M1) and the first zinc oxide varistor (M0) form a wavelength pre-emission channel. The second zinc oxide varistor (M1) and the gas discharge tube (G) are connected in series with each other, and the other end of the gas discharge tube (G) is grounded. The second zinc oxide varistor (M1) and the gas discharge tube (G) form an energy release channel. This application targets the waveform characteristics of lightning currents and sequentially releases surge overcurrents to achieve the goals of higher continuous operating voltage, lower residual voltage, larger flow rate, and faster response time.

The utility model provides a positive and negative plugging detection system for a non-standard Type-C interface, and belongs to the technical field of detection systems. Comprising a circuit board, the circuit board is provided with a bearing part, and the bearing part is used for detecting the insertion state of the non-standard Type-C interface so as to distinguish the forward insertion state and the reverse insertion state of the non-standard Type-C interface; and the number of the amplifiers is two, the two amplifiers are both arranged on the circuit board, the amplifiers are connected with the receiving part in series, and the amplifiers are used for amplifying the insertion state signal of the non-standard Type-C interface detected by the receiving part. According to the utility model, through cooperation of the microswitch, the amplifier, the resistor, the comparator and the indicating lamp in the bearing part, accurate detection and positive and negative insertion judgment of the insertion state of the non-standard Type-C interface are realized; effective protection on the circuit in the case of transient high-voltage impact and overcurrent is realized.

The utility model relates to the field of flow transmitter interfaces of hydrogen filling machines, in particular to a flow transmitter interface circuit. Comprising a controller (U1000C), a first connector (CN400), an isolation transceiver (U400), a first transient suppression diode (T400), a second transient suppression diode (T401), a third transient suppression diode (T402), a first voltage stabilizing diode (T410), a second voltage stabilizing diode (T411), a first photoelectric coupler (U401), a second photoelectric coupler (U402) and a first resistor (R400). According to the utility model, the isolation transceiver and the photoelectric coupler are added between the flow transmitter interface and the controller of the hydrogen filling machine, electrical isolation between the flow transmitter interface and the controller is realized through the isolation transceiver, interference of other electromagnetic signals is reduced, and the signal transmission quality is improved; a transient suppression diode is added, the safety of equipment is improved, a voltage stabilizing diode is added on a connector interface, and the stability of the equipment is improved.

The utility model relates to an LED boost constant current circuit, comprising an LED signal processing unit and a multi-channel boost constant current unit, a lamp signal input sequentially passes through the LED signal processing unit and the multi-channel boost constant current unit to drive a load LED to be on or off; a lamp signal input end is connected with a transient voltage suppression diode TVS1 and an RC filtering protection circuit in parallel, the output of the RC filtering protection circuit is connected with a common mode inductor L1 through an anti-reverse diode D1, the other end, far away from the anti-reverse diode D1, of the common mode inductor L1 is connected with a differential mode inductor L2, and the other end, far away from the common mode inductor L1, of the differential mode inductor L2 serves as the output of an LED signal processing unit and is connected with a multi-channel boosting constant current unit. And the multi-channel boost constant current unit outputs to a load LED in a DCM mode. While the boost constant current output is designed to be stable, under the condition of open circuit or short circuit of the LED lamp, all the LED lamps can be extinguished at one time, and the load is well protected; and a more efficient DCM mode is selected for driving, so that the design complexity is reduced while the design requirements are met safely and efficiently.

The utility model discloses a Hall sensor circuit for cabinet door state detection, and belongs to the field of sensor circuits. Comprising a Hall sensor module, a filtering module, a voltage protection module, a current limiting module, a state indication module and a signal output interface module. The Hall sensor module is used for sensing a magnetic field signal generated by the position change of the cabinet door and outputting a corresponding level signal; the filtering module is composed of a pi-type filtering circuit composed of a capacitor and an inductor and is used for suppressing high-frequency interference of a power supply and improving power supply stability. The voltage protection module adopts a transient voltage suppression diode to realize input surge suppression; the current limiting module is composed of a plurality of resistors and is used for limiting output current and realizing signal level voltage division conditioning; the state indication module indicates the state of the cabinet door in real time through a light-emitting diode; and the signal output interface module is used for transmitting the processed signal to a control system. The circuit has the advantages of simple structure, strong anti-interference capability, high adaptability and good detection reliability.

A vertical vacuum welding furnace adopted in the welding method comprises a welding furnace body and a temperature controller, and the welding furnace body comprises a furnace body base, a furnace body upper cover, a lower heating body, an upper heating body, a welding graphite plate, a welding graphite plate cover plate, an inflation rod and a vacuumizing pipe. The welding graphite plate is provided with a real temperature thermocouple, and the welding graphite plate cover plate is provided with an upper heating body temperature control thermocouple; the welding method comprises the following steps: step a, placing a TVS diode between a welding graphite plate and a welding graphite plate cover plate; step b, vacuumizing; step d, filling nitrogen; e, heating and welding; and f, vacuumizing and then cooling. According to the invention, uniform IMC intermetallic compounds can be generated between the layers of the TVS diode, that is, the adhesive force and mechanical strength between the layers of the TVS diode can be improved, and the current wave impact capability and product reliability of the TVS diode can be improved.

According to the battery management chip protection circuit, a battery management chip comprises a first number of sampling pins, the protection circuit comprises a plurality of transient voltage suppressor diodes TVSs, the negative electrode of each TVS is connected with a battery cell corresponding to the last sampling pin in each group of sampling pins, and the negative electrode of each TVS is connected with a battery cell corresponding to the last sampling pin in each group of sampling pins; the positive electrode is connected with the battery cell corresponding to the first sampling pin in the battery management chip; wherein the number of TVSs contained in each group of sampling pins is the same, and in each group of sampling pins, the withstand voltage values of all the sampling pins are the same. In this way, stepped protection of the first number of sampling pins in the battery management chip is achieved, surge voltage exceeding the withstand voltage value of the middle pin is prevented from being generated in the surge limiting process of the last pin, the reliability of the battery management chip is improved, and the service life of the battery management chip is prolonged.

The application discloses a welding method suitable for large-through-flow transient voltage suppression diodes, and a vertical vacuum welding furnace used in the welding method comprises a welding furnace body and a temperature controller, the welding furnace body comprises a furnace body base, a furnace body upper cover, a lower heating body, an upper heating body, a welding graphite plate, a welding graphite plate cover plate, a gas filling rod and a vacuum pumping pipe, the welding graphite plate is provided with an actual temperature thermocouple, and the welding graphite plate cover plate is provided with an upper heating body temperature control thermocouple; the welding method comprises the following steps: step a, placing a TVS diode between the welding graphite plate and the welding graphite plate cover plate; step b, vacuum pumping; step d, nitrogen filling; step e, heating and welding; and step f, cooling after vacuum pumping. The application can make the TVS diode generate uniform IMC intermetallic compounds between layers, that is, can improve the adhesion and mechanical strength between layers of the TVS diode, and can improve the current wave impact capacity and product reliability of the TVS diode.

The invention discloses a multi-power-supply pre-drive control circuit device and method. The multi-power-supply pre-drive control circuit device comprises a power supply module, a pre-drive driving module, a switch control output module, a current sampling module and a micro-control processor module, the power supply module is connected with the pre-drive module; the pre-driving module is connected with the switch control output module; the switch control output module is connected with the current sampling module; and the current sampling module is connected with the micro-control processor module. The system has the advantages that dynamic adjustment can be carried out according to actual load requirements through double-circuit power supply, the system is suitable for small-current loads and can also cope with large-current peak values, and flexibility and expansibility are achieved; a pre-driving chip is adopted, driving and protection functions are integrated, serial peripheral interface (SPI) communication is supported, and system configuration and state monitoring are facilitated; through the multi-protection design of an anti-reverse connection circuit, a transient voltage suppressor (TVS) tube, a filter circuit and the like, the stability and the electromagnetic compatibility (EMC) performance in a complex automobile electronic environment are improved.

The utility model relates to the technical field of digital output circuits, and discloses an isolated DO electrostatic protection circuit, which comprises an isolated DO circuit, the isolated DO circuit comprises a filter capacitor bank and a voltage control type relay which are electrically connected, the voltage control type relay comprises a coil and a contact switch which are arranged in an isolated manner, and the filter capacitor bank is electrically connected with the voltage control type relay. And the output end of the voltage control type relay is connected in parallel with at least one of the capacitor C5, the piezoresistor RV1 and the transient voltage suppression diode TVS1. According to the utility model, by additionally arranging the TVS diode, the piezoresistor and other structures and carrying out simple circuit improvement, static electricity of the isolated DO can be timely dredged only by using fewer electrical elements, so that the anti-interference capability of equipment is improved, the stability and the reliability of the equipment are enhanced, a series of losses caused by static electricity faults are reduced, and the safety of the equipment is improved. The product economic benefit is further improved.

The present invention relates to the field of anti-electromagnetic interference technology, and provides a method for designing surge protection for a Type-C interface power supply. The method comprises a Type-C interface power supply, which comprises a Type-C interface, a transient voltage suppressor diode D4, and a chip end; the method comprises: obtaining an initial circuit schematic diagram and surge protection requirements of the Type-C interface, and determining the rated voltage, rated power, and response time of the Type-C interface; determining a first electrical characteristic of the Type-C interface generating low-voltage surge interference based on the rated voltage and rated power, and configuring multiple TVS transient voltage suppressor diodes at the output end of the Type-C interface to generate a first circuit schematic diagram; obtaining a second electrical characteristic after configuring the multiple TVS transient voltage suppressor diodes, and configuring multiple common-mode inductor filters at the output end of the multiple TVS transient voltage suppressor diodes to generate a second circuit schematic diagram; generating a Type-C interface to be verified based on the second circuit schematic diagram, and performing a low-voltage surge test.

The embodiment of the utility model provides a measurement system of a transient voltage suppressor (TVS), belongs to the technical field of electronics, and aims to solve the problem of large measurement error of the breakdown voltage VBR of the TVS so as to improve the accuracy of measuring the breakdown voltage VBR of the TVS. The system comprises a control unit; the current measuring unit, the first resistor and the transient voltage suppression diode are connected in series to form a series structure; the current excitation measurement unit is connected in series with the series structure; the first voltage measuring unit is connected with the series structure in parallel; wherein the control unit is used for controlling the current excitation measurement unit, the first voltage measurement unit and the current measurement unit to measure the transient voltage suppression diode.

The utility model relates to the related field of diode packaging structures, in particular to a transient suppression diode packaging structure with a power enhancement function, which comprises a device body, an upper shell, a lower shell, a connecting assembly, a pin assembly, a boss and a chip are arranged in the device body, the upper shell and the lower shell are symmetrically arranged, and the connecting assembly is connected with the pin assembly. The connecting assembly is installed between the upper shell and the lower shell, the two pin assemblies are symmetrically located at the outer ends of the upper shell and the lower shell, bosses are arranged in the upper shell and the lower shell respectively, embedded grooves are formed in the inner sides of the bosses, and the chip is correspondingly connected between the two embedded grooves. The connecting assembly comprises an upper sleeve and a lower sleeve, and the pin assembly comprises a mounting plate and a hinge seat, so that folding and limiting of a pin piece can be realized, flexible use or storage of the pin piece is facilitated, convenient disassembly and assembly operation between the upper shell and the lower shell can be realized, and disassembly, maintenance or replacement of a chip is facilitated.

The application discloses a protection circuit of a display module and the display module. The protection circuit comprises at least one protector and a timing controller. A first functional pin of a connector in the display module is electrically connected with an input end of the protector, and an output end of the protector is electrically connected with an input end of the timing controller. The protector comprises a transient voltage suppression diode and a voltage stabilizing diode. The first functional pin is electrically connected with the transient voltage suppression diode, and the output voltage of the first functional pin is adjusted to a first voltage by the transient voltage suppression diode. The first functional pin and the transient voltage suppression diode are respectively electrically connected with the voltage stabilizing diode, and the input voltage of the voltage stabilizing diode is adjusted to a safe working voltage of the timing controller by the voltage stabilizing diode. By arranging the protector between the connector and the timing controller, the electrostatic discharge protection of the timing controller is realized, and the voltage short circuit problem is avoided, so that the reliability of the protection circuit is improved.

The invention discloses a low-voltage low-clamping low-leakage transient suppression diode and a preparation method thereof. Relates to the technical field of diodes. Comprising the following steps: step 1, selecting a P-type silicon substrate; step 2, initial oxidation; growing a layer of oxidation film on the surface of the wafer through a thermal oxidation method in a dry oxygen atmosphere; step 3, protecting the front area with a photoresist, and defining a photoresist pattern of the front area through exposure and development; removing the oxide film in the front exposed region by using a BOE corrosive liquid to expose the front N + isolation region to be diffused; step 4, taking POCl as a phosphorus source, and carrying out pre-deposition treatment in a diffusion furnace; step 5, N + isolation region phosphorus propulsion; step 6, etching a mesa structure; the performance attenuation rate is less than 10% after a high-temperature and high-humidity reliability test, and the protection requirements of low-voltage precision circuits of the Internet of Things, consumer electronics and the like are perfectly met.

The application discloses a supercapacitor-based power supply system and a car door handle, and relates to the field of automobile accessories. The supercapacitor-based power supply system comprises a battery, a transient voltage suppression diode, a voltage stabilizing circuit, a supercapacitor, a micro control unit, a driving circuit and a motor. The positive electrode of the battery is connected with the input end of the transient voltage suppression diode. The output end of the voltage stabilizing circuit is connected with the charging end of the supercapacitor and the power input end of the micro control unit. The discharging end of the supercapacitor is connected with the output end of the voltage stabilizing circuit, which is used for providing backup power for the micro control unit, the driving circuit and the motor when the battery is disconnected or the output voltage of the battery is lower than a preset value. The control signal output end of the micro control unit is connected with the input end of the driving circuit, and the output end of the driving circuit is connected with the motor. The micro control unit is configured to monitor the voltage and / or the electric quantity of the supercapacitor. The supercapacitor supplies power to the motor through the driving circuit, thereby improving the power supply stability.

A transient voltage suppression diode includes a substrate of a first conductivity type, a first well region of a second conductivity type disposed in the substrate, a first contact region of the first conductivity type disposed in the first well region and electrically coupled to an input, a second well region of the first conductivity type disposed in the substrate laterally separated from the first well region, a second contact region of the second conductivity type disposed in the second well region and electrically coupled to a ground, and an isolation region disposed in the substrate surrounding a side of the first well region.

The application provides a GPP unidirectional transient voltage suppression diode chip and a production method thereof, which comprises an N++ layer 4, a P+ layer 5 and a P++ layer 6; the upper surface of the P++ layer 6 comprises a planar part and an etching groove 1 arranged around the edge of the planar part; the P+ layer 5 is arranged on the upper side of the P++ layer 6, and the N++ layer 4 is arranged on the upper side of the P+ layer 5; the side surface of the N++ layer 4, the side surface of the P+ layer 5 and the etching groove 1 are provided with a passivation glass 2. The P+ substrate is adopted, the P+ substrate has better uniformity, the product VB is more uniform, and the transient voltage suppression diode characteristics are met. The inverted trapezoidal groove shape is adopted, the bird beak shape of the photoresist mask is avoided, the uniformity of the electrophoretic glass is improved, and the risk of sharp tip discharge is reduced.

The invention relates to a chip-on-board packaging area light source and a method for improving the antistatic grade of the chip-on-board packaging area light source. The area light source comprises a shell (2) and a circuit board (1) in the shell (2). A transient voltage suppression diode (11) and a light emitting diode (12) are arranged on the circuit board (1), and the light emitting diode (12) is connected with the transient voltage suppression diode (11) in parallel and is connected with a positive electrode (13) and a negative electrode (14) together; discharge teeth (21) are arranged on the inner surface of the shell (2), the discharge teeth (21) are electroplated with metal, and the tips of the discharge teeth (21) point to the circuit board (1). Compared with the prior art, the anti-static grade of the chip-on-board packaging surface light source can be improved.

The utility model discloses an anti-crosstalk circuit based on a multi-split high-low side combined drive relay. The anti-crosstalk circuit comprises a power supply, a high-drive module, at least two relays and at least two low-drive modules. A common diode is arranged between a second end of a high-drive switch and a grounding end, the second end of the high-drive switch is connected with a first end of a relay, and a second end of the relay is grounded through a transient voltage suppression diode and a low-drive switch which are connected in parallel in a corresponding low-drive module, so that when the high-drive switch is switched off, the low-drive switch is switched off; the low voltage drop characteristic of a common diode can be utilized to clamp the voltage at the two ends of the relay below the preset voltage, and the preset voltage is far less than the minimum starting voltage driven by each relay, so that the relays of other paths cannot be started; and the condition of mutual crosstalk among the relays after the high-drive switch is switched off when one high-drive module is combined with a plurality of low-drive modules to drive a plurality of relays is avoided.

The application relates to a large-current impact protection circuit of an online ground net corrosion monitoring device, and belongs to the technical field of ground net corrosion monitoring. The protection circuit is connected in series between a ground net conductor and a corrosion monitoring sensor, and comprises a four-stage cooperative protection circuit, a self-recovery protection unit and a control and detection unit. The four-stage cooperative protection circuit is sequentially composed of a gas discharge tube, a metal oxide varistor, a transient voltage suppression diode and a signal isolation unit composed of a direct-current isolation capacitor and a magnetic coupling transformer according to a signal flow direction, and is used for discharging and clamping large-current impacts in stages; the self-recovery protection unit comprises a PPTC self-recovery fuse and a magnetic latching relay connected in series. The application has the advantages that the device can withstand 100kA short-circuit current and 40kA lightning current impact without being damaged, can automatically recover the monitoring function after the impact, and is suitable for online ground net corrosion monitoring in a strong electromagnetic environment such as a transformer substation and a wind power plant.

The application belongs to the technical field of indirect lightning protection between cable ports of avionics, and particularly relates to an indirect lightning protection circuit and a device selection method thereof, wherein the indirect lightning protection circuit comprises: a gas discharge tube (GDT); a transient voltage suppression diode (TVS) connected in parallel with the GDT; and a pulse resistor (R) connected between a line in which the GDT and the TVS are located, for voltage division.

The utility model provides a differential mode surge protection circuit and Ethernet equipment. The differential mode surge protection circuit is arranged between a PHY chip and a differential signal end. The differential mode surge protection circuit comprises a transient voltage suppression diode, a current limiting module and an isolation module. The first end of the transient voltage suppression diode is connected with the signal positive end of the PHY chip, the second end of the transient voltage suppression diode is connected with the signal negative end of the PHY chip, the two ends of the transient voltage suppression diode are connected with the differential signal end through the isolation module, and the current limiting module is arranged between the transient voltage suppression diode and the isolation module. The current limiting module is arranged between the transient voltage suppression diode and the isolation module, so that the current flowing through the transient voltage suppression diode can be suppressed, the smaller the current on the transient voltage suppression diode is, the smaller the clamping voltage of the transient voltage suppression diode is, and the differential mode surge resistance of the Ethernet equipment can be greatly improved.