658 results about "Varistor" patented technology

The invention discloses an electric energy metering box fault prediction method and system based on big data analysis, relates to the technical field of smart power grids, and solves the problems of progressive aging missing detection and instantaneous interference misjudgment caused by dependence on single parameter threshold alarm and fault positioning misalignment caused by multi-source data isolated analysis in the prior art. According to the scheme, electrical, environment and equipment state parameters are collected in real time through a multi-dimensional sensing network; the error drift of the mutual inductor is dynamically predicted based on an LSTM-Kalman filtering model, and core breakdown early warning is realized in combination with wavelet transform; outputting a corrected resistance value and a fault mark by using a BP neural network; predicting the life of the piezoresistor by adopting a gradient boosting decision tree and fusing lightning overvoltage characteristics; the transient interference is suppressed through the combination of a Transform self-attention mechanism and dynamic time warping; according to the method, the aging detection precision and the complex environment adaptability are remarkably improved, the misjudgment rate is reduced, and the multi-fault associated positioning and active defense capability is realized.

The invention provides an optimization method and an optimization device for electrical performance of a ZnO piezoresistor based on O2 heat treatment. According to the method, O2 is introduced into the ZnO varistor under the condition of heat treatment, and oxygen vacancies in the ZnO varistor are reduced under the oxygen atmosphere, so that the donor concentration is reduced, the carrier concentration is reduced, and the electrical performance of the ZnO varistor is remarkably improved. Besides, the optimization device provided by the invention is used for the heat treatment step in the electrical performance improvement process of the ZnO varistor, and the front and back surfaces of the ZnO varistor can be in full contact with gas in the heat treatment process, so that the electrical performance is uniformly and effectively improved.

The invention discloses a piezoresistor assembling device, and belongs to the technical field of electronic component manufacturing equipment. The problems that existing piezoresistor assembly mostly depends on manual or semi-automatic equipment, production efficiency is low, consistency is poor, all mechanisms are lack of effective cooperation and need manual intervention, resistor insertion deflection is prone to occurring, sand filling is uneven, and cover plate correction precision is low are solved. The device comprises a shell feeding mechanism, a resistor feeding mechanism, a cover plate feeding mechanism, a material inserting mechanism, a sand filling mechanism, a cover plate assembling mechanism, a driving mechanism, a supporting mechanism and a control system. The supporting mechanism supports all the mechanisms, the driving mechanism drives the shell to move at the stations of the material inserting mechanism, the sand filling mechanism and the cover plate assembling mechanism, the control system coordinates all the mechanisms to act, and all the mechanisms sequentially complete feeding of the shell, the resistor and the cover plate, insertion of the resistor into the shell, sand filling and cover plate assembling. The device is mainly used for automatically completing full-process assembly of the piezoresistor, continuous automatic production is achieved, and the assembly efficiency and the product consistency are improved.

The invention discloses a piezoresistive pressure sensor chip and a preparation method thereof, and belongs to the technical field of micro-electromechanical systems. The piezoresistive pressure sensor chip comprises a substrate, the back of the substrate is etched with a cavity, the center of the cavity is provided with a cross-shaped mass block, and four hollow islands and four peninsula are arranged along the linear direction of the cross-shaped mass block; a plurality of groups of piezoresistor strips are arranged on the front surface of the substrate, each group of piezoresistor strips comprises a first piezoresistor strip component arranged close to the center and a second piezoresistor strip component arranged close to the side wall of the cavity, and the first piezoresistor strip component forms an internal Wheatstone bridge through a first metal lead group; the second piezoresistor strip component forms an external Wheatstone bridge through a second metal lead group; the glass is arranged on the substrate back. The piezoresistive pressure sensor chip can measure the pressure of a micro-pressure section, can bear high overload equivalent to a plurality of times of the full scale, and has the advantages of high sensitivity, good linearity, high precision, good dynamic performance and the like.

The invention relates to the technical field of pressure sensors, and discloses a piezoresistive multi-range MEMS pressure sensor and a processing method thereof. The piezoresistive multi-range MEMS pressure sensor comprises: a pressed diaphragm; the mass blocks comprise a central mass block and a fixed mass block; the insulating layer is clamped between the pressed diaphragm and the mass block; the piezoresistor is arranged on one side, deviating from the mass block, of the pressed diaphragm; the at least two supporting frames are located in the pressure groove, each supporting frame surrounds the center mass block and is spaced from the center mass block, the supporting frame adjacent to the center mass block is connected with the center mass block through a first connecting beam, and the supporting frame adjacent to the fixed mass block is connected with the fixed mass block through a second connecting beam; every two adjacent supporting frames are connected through a third connecting beam. The piezoresistive multi-range MEMS pressure sensor disclosed by the invention is simple in structure and easy to process, and not only realizes multi-range acting force detection, but also realizes micro-range high overload measurement.

The invention relates to the technical field of stand-by power supply monitoring, in particular to an output stability monitoring method for a stand-by power supply for an elevator, which comprises the following steps of: judging whether the output stability of a power supply to be tested is abnormal or not by connecting a piezoresistor test loop and utilizing temperature change curve comparison conditions of a piezoresistor under different output working conditions; calculating a performance separation characterization index under each output working condition by using the temperature increment curve relative to the ambient room temperature; analyzing and determining a performance local separation power supply according to an index sequence consisting of the performance separation characterization indexes; and finally, determining an abnormal battery pack according to the internal resistance detection result of each battery pack under the determined disengagement characteristic dominant working condition. And furthermore, the output performance fluctuation condition of the battery pack in the switching operation process of different remaining electric quantities is indirectly quantified, and the dynamic guarantee capability of the standby power supply under the full working condition is comprehensively reflected.

The utility model discloses a power supply input surge protection and isolation device, which comprises a piezoresistor, a surge decoupling power resistor and a TVS (Transient Voltage Suppressor) tube which are sequentially connected in series, and a self-adaptive surge control circuit which is connected with the surge decoupling power resistor in parallel, when surge overvoltage occurs, the TVS tube is firstly broken down, and transient large current flows through the adaptive surge control circuit; the surge decoupling power resistor is used for enabling the passing surge current to generate relatively large voltage drop after the TVS tube is broken down; the self-adaptive surge control circuit comprises a first MOS tube which is used for conducting transient large current passing through a TVS (Transient Voltage Suppressor) tube; when the voltage drop on the MOS tube is greater than the breakdown voltage of the voltage-regulator tube, the voltage-regulator tube is broken down to trigger the conduction of the triode; when the voltage-regulator tube is broken down, the triode is conducted, so that the GS voltage drop of the first MOS tube is reduced, and the first MOS tube is turned off; when the sum of the clamping voltage of the TVS tube end and the voltage drop of the surge decoupling power resistor exceeds the minimum action voltage of the piezoresistor, the piezoresistor acts, so that high-energy transient interference flows through the piezoresistor, and surge protection is realized. According to the utility model, the surge protection and isolation protection functions of the input end of the power supply can be effectively realized, and the safety and stability of the use of the power supply are ensured.

The invention provides a method and device for increasing the rated current breaking frequency of a direct-current solid-state circuit breaker and application of the method and device, and aims to solve the problem that the breaking frequency of an existing direct-current solid-state circuit breaker is limited due to over-temperature damage caused by performance degradation after multiple current impacts of a piezoresistor and difficult measurement of the junction temperature of a power device. The system comprises a junction temperature prediction module based on a physical information neural network, an auxiliary energy absorption module and a power device voltage clamping module. The junction temperature prediction module is used for accurately predicting the junction temperature of the power device in real time by fusing a physical thermal model and a neural network; the voltage clamping module suppresses turn-off overvoltage; and the auxiliary energy absorption module is started when the junction temperature is close to the limit to absorb residual energy. According to the design, turn-off energy is reasonably distributed, the impact frequency and strength of the piezoresistor are reduced, the service life of the piezoresistor is remarkably prolonged (for example, the service life is prolonged by about 10 times under the impact of 200A), then the rated breaking frequency of the solid-state circuit breaker is greatly increased, and the solid-state circuit breaker is low in cost, high in reliability and suitable for scenes such as a direct-current power grid.

The invention relates to the technical field of SPD lightning protection, in particular to an intelligent SPD lightning protection detection system. The system comprises a data acquisition module used for acquiring leakage current, voltage and temperature of a piezoresistor; the lightning protection analysis module is used for analyzing the dispersion degree of the leakage current of the piezoresistor and the change trend of the leakage current, and determining the damage degree of the piezoresistor in combination with the temperature range of the piezoresistor and the dispersion degree of all elements in the leakage current coupling sequence; the method comprises the following steps of: analyzing the complexity and the voltage change trend of abrupt change data in the voltage of the varistors, and combining the similarity of the voltage change trends between the varistors connected in parallel to determine the voltage anomaly of the varistors; and the lightning protection detection module is used for judging the lightning protection detection precision at the current moment. According to the invention, the problem that the SPD lightning protection detection system cannot prevent lightning surge and power frequency voltage from damaging electrical equipment is solved, and the reliability of the SPD lightning protection detection system is improved.

The utility model relates to the technical field of electrical protection devices, in particular to a surge protection device with a temporary overvoltage protection function, which comprises a piezoresistor assembly, an inductor and a switch assembly, the piezoresistor assembly is connected with the switch assembly in parallel, and two ends of the inductor are respectively connected with the piezoresistor assembly and the switch assembly. The switch assembly comprises a conduction switch, a combination switch, a resistor R1 and a capacitor, the conduction switch is in linkage connection with the combination switch, the conduction switch is connected with the capacitor in series, the resistor R1 is connected with the combination switch and the inductor in series, and one end, away from the conduction switch, of the capacitor is connected with the combination switch and the piezoresistor assembly; when the conduction switch is closed and the capacitor is fully charged, the combination switch is conducted. By means of the arrangement, the surge protection device can be prevented from being damaged by impact when overvoltage occurs; when surge voltage occurs, the surge protection device can effectively discharge the surge voltage, and the safety of electric equipment is protected.

A pressure sensor (1000) and a preparation method therefor and an air conditioning device. The pressure sensor (1000) comprises: a silicon substrate (100), the silicon substrate (100) comprising a first surface (101) and a second surface (102) opposite to each other, and the second surface (102) being provided with a cavity (150); a plurality of doped leads (120), the plurality of doped leads (120) being arranged in the silicon substrate (100); a plurality of varistor (130), the plurality of varistors (130) being electrically connected to the plurality of doped leads (120), respectively; a plurality of contact plugs (140), the plurality of contact plugs (140) being electrically connected to the plurality of doped leads (120), respectively; and a sealing cover (200), the sealing cover (200) being fastened on the silicon substrate (100) and forming a closed cavity (300) with the silicon substrate (100); the sealing cover (200) comprises a bonding portion (201); the sealing cover (200) is bonded and connected to the silicon substrate (100) by means of the bonding portion (201); the orthographic projection of the bonding portion (201) on the silicon substrate (100) is located between the orthographic projections of the varistors (130) and the contact plugs (140) on the silicon substrate (100); the surface of each varistor (130) facing the sealing cover (200) is exposed to the closed cavity (300); and in a first direction (Z), the distance between a third surface (121) of each doped lead (120) and the first surface (101) is greater than the distance between the surface of each varistor (130) facing the sealing cover (200) and the first surface (101).

A protective device that includes a thermal fuse and a metal oxide varistor (MOV) fuse positioned in series downstream of a main breaker, wherein a transformer's primary windings are positioned upstream from the MOV fuse and downstream of the thermal fuse.

A pressure sensor, relating to the technical field of sensors. The pressure sensor comprises a first substrate (21) and a second substrate (22) arranged opposite to each other, and a cavity (23) located between the first substrate (21) and the second substrate (22). The first substrate (21) comprises a pressure-sensitive film (211), and bonding rings (212), piezoresistors (213) and conductive columns (214) which are arranged on the side of the pressure-sensitive film (211) close to the second substrate (22). In the orthographic projection on the second substrate (22), each piezoresistor (213) is located within the range of the cavity (23) and close to the edge of the cavity (23), the corresponding bonding rings (212) are arranged on the side of the piezoresistor (213) distant from the center of the cavity (23), the bonding rings (212) are at least partially adjacent to the piezoresistor (213), and the piezoresistor (213) is connected to the corresponding conductive column (214). In a direction in which the first substrate (21) points to the second substrate (22), the height of the bonding rings (212) is greater than that of the piezoresistors (213). Also disclosed is a preparation method for the pressure sensor.

The invention discloses a direct-current power generation system and a control method thereof, which innovatively adopts a photovoltaic and energy storage double-cascade architecture and combines an intelligent protection and coordination control strategy. The system comprises N photovoltaic cascade subunits and M direct current energy storage modules, and each unit is provided with a bypass protection device. Each photovoltaic cascade subunit is integrated with an MPPT controller, an isolation converter and a bypass protector containing a piezoresistor and a diode; the energy storage module adopts a non-isolated DCDC conversion circuit, and a matched energy storage bypass protector is integrated with a bidirectional power electronic switch, a piezoresistor and a mechanical isolation switch. The technical problems of large voltage fluctuation, low system reliability, difficult maintenance and the like of a traditional direct current system are effectively solved, the service life of equipment is prolonged while the system stability is improved, and the system is particularly suitable for medium-high voltage direct current power supply scenes.

The invention relates to the technical field of equipment foundation vibration detection, in particular to an equipment foundation for measuring self vibration or deflection through resistance change and a measuring method. The equipment foundation comprises an alignment device and a supporting device, piezoresistor elements are installed at the four corners of the top end of the alignment device, and the supporting device comprises a contact plate, a spring shock absorber and an equipment pedestal. According to the method, the vibration or deviation condition of an equipment pedestal is monitored in real time through a piezoresistor element, the accurate sensing of the basic state of the equipment is realized by utilizing the inverse ratio relation between resistance change and pressure change, and the quantitative relation between the resistance change quantity and the displacement quantity of the equipment pedestal is established through laboratory calibration. And when the change of the resistance value exceeds a preset threshold value, an alarm signal is sent to an integrated platform, so that rapid fault early warning is realized. According to the invention, the digital inspection of the equipment foundation is realized, the vibration or deflection state can be timely and automatically sensed, the safe and stable operation of the equipment is effectively guaranteed, and the management efficiency and reliability of the equipment are improved.

The invention discloses a pressure and acceleration integrated graphene composite sensor, which relates to the technical field of sensors, and comprises at least one composite unit, and the composite unit comprises a pressure sensor and an acceleration sensor; the pressure sensor comprises a pressure support frame, a central cross beam and a plurality of first graphene piezoresistors; the first graphene piezoresistors are respectively arranged at the joints of the tail ends of the central cross beams and the pressure support frame; the acceleration sensor comprises an acceleration supporting frame, a central island, a plurality of connecting beams, a plurality of second graphene piezoresistors and a plurality of mass blocks; a plurality of side holes are formed in the central island, and sensitive blocks are fixedly arranged in the middles of the side holes; the second graphene piezoresistor is fixedly arranged on the sensitive block; and each first graphene piezoresistor and each second graphene piezoresistor are respectively connected with two composite electrodes. Pressure and acceleration can be measured at the same time, and the measurement accuracy can be improved.

The invention belongs to the technical field of high-voltage electric appliance material preparation, and particularly relates to a zinc oxide resistor disc and a preparation method and application thereof. The preparation method comprises the following steps: (1) pre-sintering zinc oxide powder; (2) mixing the zinc oxide powder obtained in the step (1), an auxiliary agent and a dispersion liquid, and carrying out ball milling to obtain slurry; the particle size D50 of the slurry is 0.8-1.2 [mu] m, and the dispersity is greater than or equal to 95%; (3) performing spray drying and granulation on the slurry to obtain granulation powder; (4) carrying out molding and first sintering on the granulated powder to obtain a resistor disc semi-finished product; the first sintering adopts sectional sintering; and (5) forming an electrode layer on at least one surface of the resistor disc semi-finished product by adopting a vacuum sputtering and / or electrophoretic deposition process, and performing secondary sintering and annealing. The contact resistance of the zinc oxide resistor disc is less than or equal to 5m omega; and after 1000 hours of aging in a 85 DEG C + 85% RH environment, the leakage current increase is less than or equal to 2 [mu] A, and the performance degradation rate is less than or equal to 5%.

The invention relates to the technical field of power electronics, and discloses an alternating-current static switch topology with a buffering function and a design method of the alternating-current static switch topology. The alternating-current static switch topology comprises a bridge circuit and a buffer circuit, the buffer circuit comprises a first resistor, a first capacitor and a piezoresistor, the first resistor and the first capacitor are connected in series and then connected to the two ends of the bridge circuit in parallel, and the piezoresistor is connected to the two ends of the bridge circuit in parallel. According to the alternating-current static switch topology, the IGBT transistors of the bridge circuit achieve circuit mu s-level rapid opening and closing switching, and opening and closing rapidity is guaranteed; when the IGBT transistor of the bridge circuit is switched off, the piezoresistor of the buffer circuit and the RC circuit absorb the peak voltage of the IGBT transistor when the large current is switched off, so that the IGBT transistor is prevented from generating relatively high voltage stress due to system inductive reactance, the safe and stable work of the IGBT transistor in the bridge circuit is ensured, and the reliability and the stability of the application of the alternating current static switch are improved.

The invention provides a power converter, and belongs to the technical field of power electronics. In the scheme provided by the invention, the lightning protection unit in the power converter comprises a piezoresistor and a gas discharge tube which are connected in series. Therefore, the action voltage of the lightning protection unit can be effectively increased on the premise that the action voltage of the piezoresistor is not increased, and it is ensured that the lightning protection unit can be suitable for the high-voltage power converter. Moreover, by connecting the divider resistor in parallel with the gas discharge tube, flexible voltage division of the piezoresistor and the gas discharge tube can be realized, so that the model selection flexibility of the piezoresistor and the gas discharge tube is effectively improved. Besides, in a lightning stroke scene, the voltage at the two ends of the gas discharge tube after action is relatively low, and the residual voltage of the lightning protection unit can be prevented from being increased, so that the requirement on the protection performance of each power device in the power converter can be prevented from being increased.

This application relates to the field of semiconductor device technology and provides a method for fabricating a pressure sensor based on flip-chip bonding technology, as well as the pressure sensor itself. The method includes growing an oxide layer on a substrate; depositing a sensitive thin film layer on the oxide layer; depositing a piezoresistive resistor on the sensitive thin film layer; depositing a wiring layer on the sensitive thin film layer; depositing a silicon capping layer on the wiring layer; depositing stop structures of different heights and positions on the cavity of the silicon capping layer; the silicon capping layer, the sensitive thin film layer, and the wiring layer forming a closed cavity structure; the stop structures being enclosed within the closed cavity structure; etching through-silicon vias (TSVs) on the silicon capping layer and applying a redistribution layer process to connect the TSVs and the wiring layer; depositing a solder resist layer on the silicon capping layer; and etching the back side of the substrate to form a pressure-sensitive cavity. This application provides a protection method that effectively protects the component structure while maintaining or improving the response frequency and sensitivity to meet the requirements of high dynamic performance.

The invention discloses a state evaluation system of a metal oxide resistor disc for a lightning arrester, relates to the technical field of electrical performance testing, and solves the technical problems that the specific influence degree of environmental factors on insulation resistance is difficult to accurately quantify, and meanwhile, the influence of various factors such as environmental conditions and operation conditions on the performance of the resistor disc cannot be comprehensively considered. By establishing a correlation model, combining the insulation resistance with environmental parameters, fully considering the influence of environmental factors on the insulation performance of the resistor disc, and by establishing the correlation model, the change rule of the insulation resistance can be analyzed more accurately, and reasonable performance change caused by external conditions is considered, so that the insulation performance of the resistor disc is improved. And the performance degradation of the resistor disc can be reflected more objectively in the subsequent comparison with actual detection data. Aging factors are calculated for each region, and the comprehensive health index of the resistor disc in each region is analyzed in combination with the relative deterioration degree coefficient of the insulation resistor, the relative deterioration degree coefficient of the resistive current and the dielectric loss coefficient.

This disclosure presents an embodiment of a power supply device for a submarine data center. One specific embodiment of the power supply device includes a pre-stage voltage regulator / conversion component, a post-stage DC-DC converter component, and a combined protection circuit. The pre-stage voltage regulator / conversion component includes several parallel single-group voltage regulator branches, each branch connected in series with a varistor and a color-coded resistor. A thin-film capacitor is connected in parallel to the output terminal of the pre-stage voltage regulator / conversion component. The post-stage DC-DC converter component, electrically connected to the pre-stage voltage regulator / conversion component, includes at least two sets of full-bridge DC synchronous rectifier circuits. The combined protection circuit includes a pre-stage combined protection circuit, a post-stage active voltage clamping circuit connected in parallel to the output side of the post-stage DC-DC converter component, and a rectifier diode bridge connected between the constant current input port and the pre-stage voltage regulator / conversion component. The pre-stage combined protection circuit is connected in series to the input side of the rectifier diode bridge. By connecting multiple voltage regulator branches in parallel and combining them with the combined protection circuit, ripple is reduced. This embodiment can improve the power supply stability of the power supply device.

The present invention relates to the technical field of eliminating static electricity from the human body, and in particular, to a varistor sponge and its application. The sponge comprises conductive particles of at least two diameters, d1 and d2, dispersed within a sponge matrix, where d2 is greater than d1. The conductive particles of diameter d1 provide the varistor sponge with a normal base resistivity R1, while the conductive particles of diameter d2 provide the varistor sponge with a compressed resistivity R2, where R1 is greater than R2. The beneficial effect of the sponge is that it generates no static sparks when used, and does not produce a shock sensation during the static electricity discharge process.

The present invention relates to an apparatus for converting electrical energy to heat comprising a plurality of modules connected in series arranged between a first and a second de pole, wherein each of the modules has a controllable switchoff type semiconductor switching element. The invention is characterized in that the modules are varistor modules (VM) comprising a varistor (14) arranged in parallel to the switching element (12), and wherein the apparatus (10) further comprises a control system (CS) for controlling the energy conversion, wherein said control system (CS) is configured to actively control a current flowing through the apparatus (10) to equal a preset current reference value by selectively switching the switching elements (12). The present invention further relates to a converter arrangement with the apparatus and a method of operation of the apparatus.

The application discloses a voltage-limited overvoltage protection component with a recoverable electromagnetic drive tripping mechanism, which is composed of a voltage-limited overvoltage protector and an electromagnetic drive tripping mechanism. In a normal state, the normally closed contact of the electromagnetic drive tripping mechanism is in a closed state, which does not affect the normal working state of the voltage-limited overvoltage protector and the protection state under a normal intensity overvoltage. When an overvoltage occurs, a pulse current flowing through the voltage-limited pressure-sensitive resistor induces a current in the upper metal disc of the electromagnetic drive tripping mechanism, which is opposite to the direction of the spiral conductor coil of the lower electromagnetic drive disc, so that the upper metal disc of the lower electromagnetic drive mechanism induces an electromagnetic repulsive force with the lower electromagnetic drive disc, thereby causing the normally closed contact of the electromagnetic drive tripping mechanism to break, effectively inhibiting the continuous effect of a subsequent power frequency or direct current arc on the voltage-limited protector, prolonging the service life of the voltage-limited overvoltage protection component, and effectively realizing the safe use coefficient and prolonging the service life of the voltage-limited overvoltage protection component.

An anode potential adjustment device and an electron accelerator. The electron accelerator comprises a first electrode sheet (201), a second electrode sheet (202) and a high-voltage end (203), wherein the high-voltage end (203) is connected to the first electrode sheet (201). The anode potential adjustment device comprises a varistor (101) and an oil cylinder (102), wherein the varistor (101) is connected between the first electrode sheet (201) and the second electrode sheet (202); and the oil cylinder (102) is connected to a hydraulic pump by means of a hydraulic oil pipe, a piston of the oil cylinder is connected to the varistor (101), and the piston is configured to drive the varistor (101) to adjust a resistance value. The anode potential adjustment device can observe changes of a beam in real time when a high voltage and the beam exist at the same time, thereby making it easier to select an anode resistor (1010).

The invention discloses a surge protector, and relates to the technical field of overvoltage protection equipment, and the surge protector comprises a first separation unit and a second separation unit which are connected in series. The first separation unit comprises a first pole piece of the piezoresistor and an electrode piece electrically connected with the wire inlet end, and the first pole piece and the electrode piece are connected through soldering tin to form a first breakpoint. The second separating unit comprises a second pole piece of the piezoresistor, a moving contact electrically connected with the wire outlet end and a separating mechanism, the moving contact is in contact with the second pole piece to form a second breakpoint, the separating mechanism comprises a sliding block and an elastic piece, the electrode piece is fixed to the sliding block, and the sliding block is provided with a firing pin. When surge occurs in the circuit, the soldering tin is fused to disconnect the first breakpoint, the sliding block slides under the action of the elastic piece, and the firing pin pushes the moving contact to be separated from the second pole piece to achieve disconnection of the second breakpoint. According to the surge protector provided by the invention, the breaking capacity of the surge protector can be improved, and the risk of electrical accidents caused by untimely breaking is reduced.

The invention relates to the technical field of resistor life detection, in particular to a real-time life detection method and system for a piezoresistor. The method comprises the following steps: dividing a current impact experiment of the piezoresistor into a plurality of time windows, obtaining a plurality of related parameters representing that the resistance performance tends to be degraded in each time window, and screening out direct detection parameters measured by an instrument in a resistance degradation process; according to the relevance between the direct detection parameter and the indirect detection parameter of the multiple related parameters, obtaining the relevance significance and reference factors of the two types of detection parameters; weighting processing is carried out on the direct detection parameters to obtain variation characteristic quantities of the piezoresistor tending to deteriorate in different time windows, a prediction model is constructed through the variation characteristic quantities constructed in a self-adaptive weighting mode, and residual life detection is carried out on the target piezoresistor which is in a running state at present by utilizing the prediction model, so that the residual life of the target piezoresistor is detected. According to the scheme, the accuracy of predicting the real-time residual life of the piezoresistor in the using process is improved.

This invention provides a high-voltage suppression and voltage regulation protection circuit, relating to the field of circuit protection technology. The circuit includes a high-voltage discharge elimination circuit, a π-type composite EMI filter network circuit, and a voltage regulator circuit connected in sequence, with terminals at both the input and output ends. The high-voltage discharge elimination circuit consists of four DC spark discharge tubes and two varistors. The π-type composite EMI filter network circuit includes two high-voltage ceramic capacitors, two inductors, and one common-mode inductor. The voltage regulator circuit consists of an electrolytic capacitor and a Zener diode. Through the synergistic effect of the front-stage high-voltage elimination, intermediate-stage filtering, and rear-stage voltage regulation, the circuit achieves suppression and voltage regulation protection against high-voltage interference ranging from kilovolts to tens of kilovolts, ensuring continuous normal operation of the circuit system under harsh high-voltage environments.

The invention discloses a pluggable lightning protection device which comprises a base module and a lightning protection device module. The base module comprises a base shell, an electrode plate group is arranged at the bottom of the base shell, a base cover plate is arranged at an opening of the base shell, and a locking assembly is arranged between the base cover plate and the inner bottom of the base shell; the lightning protection device module comprises an upper cover shell, a PCB is arranged on the inner side of the upper cover shell, a piezoresistor, a fuse, a diode, a resistor, a discharge tube, an LED lamp and an upper cover electrode slice set are arranged on the PCB, the upper cover electrode slice set is connected with the base electrode slice set, and a sealing assembly is further arranged at an opening of the upper cover shell. According to the utility model, pluggable connection with a direct current power supply product can be realized to realize an electrified hot plugging effect, and other devices can be effectively protected; moreover, the lightning protection device is simple and compact in structure and convenient to plug and replace, and the overall structure is small in size due to the design of miniaturization and light weight, so that the space can be effectively saved.