47results about How to "Solve protection problems" patented technology

The invention provides a distributed power data asset management privacy protection encryption architecture design method, which comprises the steps of generating a watermark with robustness and imperceptibility by adopting a content-based digital watermarking algorithm according to statistical characteristics of power data assets, and storing a watermark embedding process and an extraction result through a blockchain; a graph-based data model is adopted, the electric power data assets carrying the watermarks serve as nodes, the data flow relation serves as edges, and an electric power data asset consanguinity graph is constructed; for distributed storage of the blood relationship map, a P2P network topology is constructed by adopting a block chain and a distributed hash table, and blood relationship map data is stored in each node of an alliance chain in a distributed manner; and verifying the digital watermark information embedded in all circulation path nodes through which the power data assets pass in the blood relationship map, calculating the similarity between the extracted watermark and the original watermark, calculating the distortion rate, and judging whether the power data assets are tampered or not.

The invention relates to the technical field of relay protection, in particular to a power distribution network relay protection collaborative optimization method and system considering new energy, and the method comprises the steps: constructing a model architecture of a power distribution network; based on the new energy access characteristics, the topological structure of the power distribution network and the line parameters of the power distribution network, performing simulation and calculation on a short-circuit fault possibly occurring in the power distribution network to obtain a short-circuit current calculation result; determining relay protection equipment of the power distribution network according to the topological structure of the power distribution network, and determining a protection constant value of each protection section of the relay protection equipment according to a short-circuit current calculation result and a protection constant value setting principle; establishing an optimization model to update an iteration decision variable, and obtaining an optimal solution of the decision variable; and adjusting the configuration of the relay protection equipment according to the optimal solution of the decision variable. By comprehensively considering the influence of new energy access on short-circuit current distribution, the reliability and effectiveness of a relay protection system are improved, and the economic operation efficiency of a power distribution network is enhanced.

The invention relates to a block chain transaction method supporting privacy protection and identity tracking, and belongs to the technical field of block chain application. The specific process of the method is as follows: a financial management institution FMA generates a public key / private key pair for member registration and anomaly analysis according to a security parameter lambda, and group sending is performed on public keys; deploying a recharging contract and a payment contract on the block chain; each consumer ui registers to the FMA through a mobile device to become a member user of the transaction system, and the consumer holds a group signature key gski returned by the FMA after successful registration; the payment service operator cj registers to the FMA to become a member before providing service, and after successful registration, the payment service operator holds the FMA to return an identifier pid of each product terminal managed by the payment service operator; and the consumer calls a payment contract to carry out order payment based on the signature key gski and the identifier pid of the product terminal, and finally, the method further comprises an anomaly analysis link.

The invention belongs to the field of industrial control and computer data security, and particularly relates to a millisecond-level power failure data protection system for an industrial control panel. The invention discloses a millisecond power failure data protection system for an industrial control panel. The millisecond power failure data protection system comprises a core processing component, a real-time synchronous shadow memory component, a bus voltage monitoring component, a pre-entropy reduction logic control component, a nonvolatile storage component and a flight control bus arbitration component. The bus voltage monitoring assembly monitors a voltage drop trend and performs early warning, the pre-entropy reduction logic control assembly calculates a minimum data survival set according to energy entropy, the real-time synchronous shadow memory assembly constructs a synchronous shadow control domain and atomizes data, and the flight control bus arbitration assembly compulsively takes over a bus and freezes processor access at the moment of power failure. Atomized writing of data into the nonvolatile storage component is guaranteed. According to the invention, zero-delay data protection and millisecond-level hot start recovery at the moment of power failure are realized, and the data security and reliability of the industrial control equipment in a severe environment are enhanced.

The invention provides a substation terminal network equipment defect elimination checking method and system based on deep learning, and the method comprises the following steps: constructing an equipment configuration heterogeneous graph network by a substation client through combining an equipment configuration file, an equipment operation log and equipment network flow data, all the transformer substation clients utilize a heterogeneous graph network to train a local model, the federated learning server updates a shared learning model by combining local training parameters of all the clients, and the clients needing to be checked continue to update the model according to updating parameters of the server; and identifying a configuration mode of local network equipment through the updated model and obtaining a configuration parameter mapping table, generating an equipment checking strategy in combination with the configuration mode and the configuration parameter mapping table, and finishing checking work of all the network equipment through the equipment checking strategy. According to the invention, the transformer substation can accurately complete network equipment checking.

The utility model relates to the field of lithium battery management discloses a kind of lithium battery management devices of self-adapting overload protection, including protection shell, and the protection shell top is provided with overload trigger component;The overload trigger component includes base one, and the base one bottom is fixedly connected at the top end of protection shell, and the base one top is fixedly connected with base two, and the base two top is fixedly connected with fixed column, and the base two top is fixedly connected with bimetallic strip, and the base one top is provided with static contact plate, and the static contact plate top is fixedly connected with clamping block.In the utility model, bimetallic strip is moved by heat deformation to drive trigger top rod, so that moving contact and static contact point are separated, and circuit on-off control is realized by reset spring cooperation, so as to carry out overload protection to lithium battery circuit, reach the effect of self-adapting overload protection, improve the security of lithium battery use, solve the problem that traditional fixed threshold protection is prone to false triggering or hysteresis protection.

The invention relates to a federated learning-based commercial data protection system, and the system comprises a federated protection module which is used for obtaining multi-modal behavior feature vectors, forming encryption features, carrying out aggregation operation, forming an encryption view, constructing a relation graph, and carrying out federated risk scoring; the self-adaptive control module is used for selecting a group of response action candidate sets, performing cost-benefit simulation evaluation on candidate actions in the response action candidate sets, generating a response action sequence, issuing a control measure command, verifying whether risk misjudgment occurs or not, and feeding back a verification result to the federal protection module; and the compliance guarantee module is used for acquiring data, carrying out noise addition on the data, locally completing encryption, constructing a verifiable trust and audit chain, hiding technical operation to corresponding legal requirements and dynamically generating a compliance state report. According to the technical scheme, the technical problems that in the prior art, misjudgment and early warning are prone to occurring, effective blocking cannot be conducted before IP leakage occurs, and privacy regulation requirements are not met are solved.

The application belongs to the field of oil exploration, and discloses a protection device for a logging instrument probe. The protection device comprises a protection mechanism and a fixing mechanism. The protection mechanism comprises a first support table, a second support table and a cavity for mounting the logging instrument probe. The fixing mechanism comprises a first clamping seat assembly for fixing the logging instrument probe on the first support table and a second clamping seat assembly for fixing the logging instrument probe on the second support table. The protection device can effectively offset the axial impact on the logging instrument probe, and further meet the requirements of fixing and protecting the logging instrument probe.

The application discloses a leakage-proof buried automobile charging pile and a use method thereof, and relates to the field of charging piles.The device comprises a liftable buried box body, a data acquisition module, a health degree calculation module, a state decision module and an execution control module.The health degree calculation module fuses the collected environmental parameters, electrical parameters and mechanical state parameters into insulation health degree and mechanical health degree.The state decision module converts between sealing, maintenance and service states according to the health degree and leakage risk level and in combination with artificial instructions, and provides a user override channel when the power factor health degree is limited.The device distinguishes between permanent damage and instantaneous fluctuation, avoids logical conflicts of dispersed control by establishing a unified health degree decision center, provides a hierarchical recovery path after failure through the state closed loop of sealing-maintenance-service, and eliminates the spatial blind area of single pile decision through multi-pile cooperation.

The invention discloses a pre-termination of an indoor and outdoor lead-in flat cable and a processing method thereof, the pre-termination of the indoor and outdoor lead-in flat cable comprises a flat cable body, two ends of the flat cable body are respectively and fixedly provided with an A-end flat multi-core splitter and a B-end flat multi-core splitter, the pre-termination flat cable technology is adopted, the technical cost required by construction welding is effectively reduced, and the construction efficiency is improved. On-site labor cost burdens are reduced for customers, the overall application cost is further reduced, in addition, due to the pre-terminating design, the labor cost is greatly reduced, the construction efficiency is greatly improved, the convenience of taking and using is achieved, rapid project promotion is ensured, and therefore the market competitiveness of products is enhanced on the efficiency level; compared with an on-site welding flat cable, the pre-terminating scheme has the advantages that the reliability of an interface position is obviously improved, the problems of limitation of straight pulling and side pulling and interface protection in on-site welding are solved, the bottleneck is thoroughly eliminated, and a new benchmark is established for the product reliability.

The present invention relates to a subject screening system suitable for multi-center research, including a regional scientific research management platform, a plurality of hospital subject screening management systems interacting with the regional scientific research management platform, and a universal health information platform; after adopting the above system and steps, the present invention has the following advantages: the system makes good use of regional platform data to assist clinical research, and the introduction of regional data significantly expands the screening coverage and number of potential subjects found, shortening the research enrollment cycle. It provides support for regional multi-center research, improves research efficiency and level, and solves the conflict between patient privacy protection and clinical research needs, pays more attention to patient privacy protection, and focuses on solving the problem of patient privacy protection in the application of regional health data in clinical research through reasonable technical solutions and business process design, providing a new idea and method for the shared application of regional data in clinical research.

The invention discloses a multi-device data transmission method based on differential privacy, which is applied to a multi-device communication system, and comprises the following steps: the system acquires original data, resource information data and path information data of a plurality of devices contained in the system, preprocesses each original data, and then constructs a super object model; obtaining a resource state vector and a topological structure adjacency list of each device through the super object model, wherein the system performs differential privacy processing on the resource state vector, the topological structure adjacency list and parameters in the process of dynamically updating the super object model; carrying out shortest path selection on the data transmission path of each device; the system fragments a data packet to be sent and distributes fragmented data to each device according to a load balancing principle, each device transmits the fragmented data to a receiving device, and the receiving device recombines and verifies the fragmented data after receiving the fragmented data. According to the invention, the transmission efficiency is improved while the data transmission privacy is ensured.

The present application relates to an accident data aggregation statistical analysis method, device and equipment based on an image map, the method comprising: collecting accident data and performing deduplication processing on the accident data; aggregating the accident data and anonymizing unit information and personal information; performing correlation analysis on the aggregated accident data to determine the statistical laws between the accident data; visualizing the accident data on an image map at multiple scales according to the statistical laws; the multi-scale display comprises aggregating and displaying the number of accidents corresponding to each accident data at a first scale, and displaying the accident occurrence points corresponding to each accident data at a second scale, wherein the first scale is larger than the second scale. The accident data includes the time information, location information, category information, unit information and personal information of the accident. The purpose of significantly improving the quality of statistical analysis of accident information is achieved.

The present application relates to the field of water and electricity relay protection, and specifically discloses a kind of water and electricity relay protection defect intelligent diagnosis method, device, equipment and medium, the method comprises: collecting the topology of hydropower station and equipment parameters, constructs node admittance matrix and divides fault point;Establishes the equivalent model of transient potential variation of hydroelectric generating set, introduces dynamic impedance compensation factor to solve short-circuit current and calculates contribution rate matrix;Carry out frequency domain analysis to extract characteristic frequency component, when waveform distortion or low-frequency oscillation in strong coupling area exceeds threshold value, select compensation model to correct sensitivity coefficient, draw protection characteristic curve and identify cooperation interface point.The present application solves the problem of large deviation in fault current calculation and sensitivity distortion caused by ignoring transient potential attenuation and harmonic, low-frequency oscillation in prior art through dynamic impedance compensation and frequency domain compensation model, realizes intelligent and accurate diagnosis of water and electricity relay protection defects.

The application is suitable for the field of automation equipment, and provides a pressure self-adaptive flexible gripping mechanical arm for desert tree planting, which is a three-section column modular structure, is composed of a light-weight protective guide rail, a multi-degree-of-freedom modular mechanical arm and a pressure self-adaptive flexible mechanical claw connected coaxially in sequence, and each unit is detachably connected through quick-change pin shafts.The light-weight protective guide rail realizes dust prevention by using built-in slide rails and upper cleaning micro-holes; the multi-degree-of-freedom modular mechanical arm realizes light weight and high rigidity by using hollow transmission rods and triangular reinforcing rib supports; the pressure self-adaptive flexible mechanical claw realizes lossless and stable gripping of irregular sand willow seedlings by using an asymmetric arc envelope structure matched with a thin film type force sensor closed loop control; and a posture compensation mechanism is further arranged to ensure that the seedlings are vertically planted into the soil.The application solves the problems of easy jamming of the kinematic pair in the desert windy and sandy environment, difficulty in field maintenance, damage and tilting planting of the seedlings, and improves the operation reliability and the survival rate of the seedlings.

The ship cabin liquid level switch protection device comprises a protection cover body, one side face of the protection cover body is of an open structure, the protection cover body comprises a fixed panel at the bottom, the fixed panel is connected with a liquid level switch, the upper portion of the liquid level switch penetrates through the fixed panel and extends into the protection cover body, and the liquid level switch is arranged in the protection cover body. The upper portion of the liquid level switch is located in the protective cover body, and a signal line at the upper end of the liquid level switch extends out of the open structure of the protective cover body. According to the ship cabin liquid level switch protection device provided by the utility model, the liquid level switch can be always in a semi-closed protected state, the ship liquid level switch is greatly ensured not to be easily damaged by external force, the service life of the liquid level switch is prolonged, and the accuracy of acquisition of various data of a cabin is improved; and safe navigation of the ship is ensured.

The invention relates to the technical field of intelligent household electrical appliance and flexible electric heating safety control, in particular to an electric blanket power control system and method, and the method comprises the steps: collecting a real-time voltage sampling sequence and a real-time loop current sampling sequence of an electric heating load, and calculating an actual measurement impedance sequence; constructing a virtual fault state, and generating a theoretical folding fault trajectory; calculating a difference value between the theoretical folding fault trajectory and the ideal impedance trajectory, and marking the difference value as a theoretical residual sequence; calculating the trend similarity between the actually measured residual error sequence and the theoretical residual error sequence; if the trend similarity is greater than a preset judgment threshold, judging that the current state is a folding overheating fault, and executing a latch-up protection strategy; otherwise, the current state is judged to be normal heat storage fluctuation, and a constant temperature adjusting strategy is executed; according to the invention, the problem of pain points of easy false alarm or protection delay in the prior art is solved, and the intelligent identification capability of the system is significantly improved.

The present application relates to the technical field of skin bag material, and particularly relates to a weather-resistant elastic composite skin bag material and a preparation method thereof, which is prepared from the following components: 65-85 parts of elastic matrix resin, 10-20 parts of elastic reinforcing agent, 4-9 parts of weather-resistant agent, 1-4 parts of plasticizer, 0.5-2.0 parts of antioxidant, and 0.3-1.0 parts of lubricant. The present application designs a multi-component synergistic composite weather-resistant agent to achieve all-round weather resistance: abandoning the single action mode of traditional small-molecule weather-resistant agents, adopting bentonite, boron nitride and nano-silicon carbide as physical barrier phases, lanthanum oxide as a chemical stable phase, chitosan and sodium silicate as interface compatible phases, and nano-cellulose agent as a dispersion reinforcing phase.

The invention discloses a vehicle passenger room remnant detection system, which is applied to an automatic passenger shortcut system, and the automatic passenger shortcut system comprises a vehicle automatic control system. The detection system comprises a vehicle-mounted VCA system and a ground VCA system. VCA is video content analysis; and the vehicle-mounted VCA system communicates with the ground VCA system through a vehicle-ground wireless network. The invention further discloses a detection method of the detection system. By means of the technical scheme, whether left articles and persons exist in the compartment or not can be rapidly judged, alarm is given to inform center workers while the car is deducted, the positions of the left articles and persons are located in the video, the workers can process the left articles and persons conveniently, manpower is saved, and meanwhile operation efficiency is improved.

The embodiment of the invention provides an intrusion detection method of the Internet of Vehicles and electronic equipment, the method is applied to a vehicle end, and the method comprises the steps: obtaining vehicle-mounted multi-source data which is used for representing vehicle data from a plurality of data sources; on the basis of the vehicle-mounted multi-source data, initial parameters of the local initial model are updated, updated parameters are obtained, and the parameter quantity of the initial parameters of the model is smaller than the preset parameter quantity; encrypting the update parameter to obtain a first encryption result; the first encryption result is uploaded to the cloud end, an intrusion detection model returned by the cloud end is received, the first encryption result is obtained by combining the cloud end with multiple second encryption results generated by other vehicle ends, parameter updating is conducted on an initial detection model of the cloud end, and the intrusion detection model is obtained and used for conducting intrusion detection on the vehicle ends. According to the method and the device, the technical problems of low detection accuracy and low data security of intrusion detection of the Internet of Vehicles in related technologies are solved.

The invention discloses a method for improving the size of an adult male penis after erection, and relates to the technical field of body local exercise. The invention discloses a method for improving the size of an adult male penis after erection. The method comprises the following steps of instrument exercise, endocrine regulation, night erection improvement, vascular endothelium protection and vascular endothelium repair. Scientific stretching exercise is carried out on the corpus cavernosum, the albuginea and the skin, scientific endocrine adjustment is matched, meanwhile, night erection is improved by assisting oral medicine, related products are used, cavernosum vascular endothelium protection and repair are achieved, retraction is prevented, and finally the purposes that the volume of the cavernosum is increased by a little every day, and the cavernosum is accumulated for a long time are achieved. Finally, the purpose of improving the erection size of the penis is achieved.

The utility model relates to the technical field of low-voltage switch cabinets, in particular to a circuit protection cover of a low-voltage switch cabinet, which comprises a shell, a fixing block is fixedly connected to the outer side of the shell, a first rubber pad is fixedly connected to one side of the fixing block, and a second rubber pad is fixedly connected to one side of the shell. According to the utility model, through the arrangement of the housing, the fixing block, the hinge, the connecting block, the connecting hole and other components, the two housings are combined together under the action of the hinge to wrap an electric wire, then the bolt and the nut penetrate into the fixing block to fix the two half housings, and then the bolt passes through the connecting hole in the connecting block to fix the connecting block and the low-voltage electric box together. Therefore, the problem that an electric wire penetrates through one end of an existing circuit protection cover of the low-voltage switch cabinet, so that the protection cover can only be installed before the electric wire is arranged, and a low-voltage electric wire part of which the bottom is provided with the electric wire cannot be protected is solved.

The utility model relates to the technical field of magnetic suspension conveying systems, in particular to a magnetic drive module and a totally-closed magnetic drive connection line system. Comprising a stator unit and a mover unit, and a first sliding rail and a second sliding rail are arranged above the two sides of an H-shaped supporting frame of the stator unit; a mover of the mover unit comprises a groove gap penetrating through the cover plate, the mover is provided with a first lower groove, a second lower groove and a third lower groove, a first sliding block in sliding fit with the first sliding rail is arranged in the first lower groove, a second sliding block in sliding fit with the second sliding rail is arranged in the third lower groove, and power magnetic steel matched with the magnetic drive motor is arranged in the second lower groove. The system comprises a first conveying line, a second conveying line and a connection module, the connection module moves between the first conveying line and the second conveying line to execute a connection task, and the first conveying line, the second conveying line and the connection module each comprise a rotor unit and a stator unit. The device can be widely applied to precision and ultra-precision machining industries.

The invention relates to the technical field of building construction, in particular to an underground diaphragm wall device suitable for complex geological conditions and a construction method.The device comprises a steel reinforcement cage, guide boxes are symmetrically arranged on the two sides of the top and the two sides of the bottom of the steel reinforcement cage, and pulleys capable of adjusting the extending length are arranged on the outer sides of the guide boxes; an adjusting assembly composed of a worm gear, a worm, a threaded sleeve and an adjusting rod is arranged in the box to control the pulleys to stretch out and draw back. The bottom of the guide box is fixedly connected with a mounting box, a clamping jaw is rotationally connected in the guide box through a first rotating shaft, and a locking assembly comprising a [-shaped locking block, a spring and a push plate is arranged. During construction, the clamping jaw and the locking assembly are used for automatically clamping the reinforcement cage, and after the reinforcement cage is hoisted into the groove, the pulley is adjusted to be tightly attached to the groove wall so as to guide the reinforcement cage to be centered; when the reinforcement cage is lowered to the bottom of the groove, the locking assembly automatically relieves locking in stages, the clamping jaw retracts under the action of the torsional spring, and the device is separated from the reinforcement cage. The clamping device has the advantages that the groove wall is protected, automatic centering is achieved, clamping is stable, and automatic unhooking can be achieved.

The invention discloses a category data analysis algorithm for personalized shuffling differential privacy protection, and relates to the field of data privacy protection and information security, the category data analysis algorithm for personalized shuffling differential privacy protection comprises the following steps: a local user inputs data and a privacy budget to a local randomizer; generating interference through a local randomizer, sampling a plurality of false messages, and sending a disturbed message set and a privacy budget to a shuffling device; the shuffling device shuffles the disturbed message set and privacy budget through a random permutation method; and sending the shuffled disturbed message set and the privacy budget data set to a server for aggregation. According to the method, by introducing the personalized differential privacy and shuffling model, the contradiction between privacy protection and data practicability is effectively solved, the relevance between the data points is broken through shuffling, the privacy protection effect is remarkably improved, and the risk of deducing the original data of the user through the data relevance is prevented.

A two-hand pull-rod binder includes a main body, a clamp, a pull-out component, and a binder cover. The clamp is located on the side of the main body and can slide laterally relative to the main body. The pull-out component is located at the end of the main body and can slide vertically relative to the main body. The vertical sliding of the pull-out component drives the clamp to slide laterally. The main body has a fixed half-ring, and the clamp has a movable half-ring that can engage with the fixed half-ring. By covering the main body and the clamp with the middle connecting surface of the binder cover, the fixed half-ring and the movable half-ring are exposed through the middle connecting surface, thus completely concealing the internal moving structure of the binder. This not only makes the product appearance cleaner and more aesthetically pleasing, meeting the integrated design requirements of modern stationery, but also effectively prevents the clamp from directly contacting the paper edge during lateral sliding, preventing paper wear, fuzzing, or wrinkling, and significantly improving the lifespan and integrity of the paper.

The invention relates to a voiceprint recognition method based on federated learning, and the method comprises the steps: enabling a to-be-processed client to generate a local personalized initial parameter group based on an initial parameter group issued by a server through the distributed characteristics of federated learning, and connecting model memory and momentum increment, a voiceprint recognition model is obtained through a first sample subset and a second sample subset which are independently sampled on the basis of a local audio data sample set, iteration training updating of a parameter set is achieved, and finally the voiceprint recognition model is obtained in a global aggregation mode of a server and is used for achieving recognition of each preset audio sender tag for audio; a voiceprint recognition method is designed, the problems of data privacy protection and distribution heterogeneity of audio data among different devices are effectively solved, and the robustness and generalization ability of a voiceprint recognition model in a system in practical application are improved.

The application relates to a kind of implementation methods of verifiable Internet of Things device data asset transaction, based on the data seller, blockchain and data buyer involved in Internet of Things data asset transaction system, the process for realizing verifiable data asset transaction is as follows: data seller publishes encrypted data on blockchain through smart contract, data buyer requests data according to needs and submits verification request.Smart contract is responsible for verifying the integrity and authenticity of data, and transmits decryption key to data buyer after verification.The data buyer decrypts the data using the key and completes the transaction.If the buyer finds that the decrypted data is abnormal, the smart contract is called to initiate arbitration.Through the confusion encryption mode, RSA accumulator technology, hash verification mechanism and on-chain arbitration mechanism, these attack behaviors are effectively resisted, and the privacy, integrity and verifiability of data transaction are ensured.

The invention relates to the technical field of nursing quality evaluation and continuous improvement systems, in particular to a nursing quality evaluation and continuous improvement system and method based on machine learning. A patient feedback analysis module; a literature analysis module; the theme analysis module is used for analyzing the nursing quality key indexes by utilizing an LDA theme modeling technology and identifying potential problems and improvement opportunities in nursing practice; the expert knowledge base module is used for storing and providing professional knowledge support; the risk prediction module is used for predicting nursing risks based on the machine learning model; a visual interface module; a collaborative recommendation module; the combination of the federated learning core function module, the Xgboost model and the GBDT model plays a complementary role in risk prediction, the Xgboost is good at processing a nonlinear relation, the GBDT is excellent in performance when processing a linear relation, and the combination of the Xgboost and the GBDT enables the risk prediction to be more comprehensive and accurate.

The invention relates to a power device protection circuit and method, refrigeration equipment and a storage medium, in the power device protection circuit, one end of a resistor R1 is connected with a power supply, the other end of the resistor R1 is sequentially connected with one end of a resistor R2 and one end of a resistor R3 in series, the other end of the resistor R3 is grounded, the first input end of a first comparator is connected with the midpoint of the resistor R1 and the resistor R2, and the second input end of the first comparator is connected with the midpoint of the resistor R2. The second input end of the first comparator is connected with the bus, the output end of the first comparator is connected with the signal output interface, the first input end of the second comparator is connected with the midpoint of the resistor R2 and the resistor R3, the second input end of the second comparator is connected with the bus, and the output end of the second comparator is connected with the signal output interface. The signal output interface is connected with the controller through a diode D1; and the controller is used for controlling the turn-off of the power device according to the signal output by the signal output interface, so that the problem that the power device is not timely protected is solved, and the timeliness of the protection of the power device is improved.