179 results about "Circuit Failure" patented technology

Temperature-aware built-in self-test (BIST) control system for selectively controlling activation of BIST circuits in a processor-based system to maintain temperature limit and related methods. The temperature-aware BIST control system is configured to selectively control the number of BIST circuits in the processor-based system activated during the same time based on a temperature limit indicator related to a sensed temperature(s) in the processor-based system and whether such is within a defined temperature threshold(s) and / or temperature change rate threshold(s), which may be programmable. In this manner, the safety manager circuit can dynamically and selectively control the number of BIST circuits activated based on temperature according to the BIST control policy(ies) to reduce or avoid circuit failures due to excess temperature, while at the same time maximizing the staggering (i.e., overlapping) of BIST circuit activations to maximize testing speed.

The application provides a composite low-voltage power cable, and belongs to the technical field of cables.The composite low-voltage power cable comprises an outer shell and a copper strip.Five groups of isolation sleeves are fixed together by a connecting block to ensure stable connection between the isolation sleeves and the copper strip, prevent displacement under external pressure, ensure stability of the copper strip, avoid circuit failure, and support columns are arranged at the centers of the isolation sleeves to provide support force, maintain stability of the isolation sleeves, prevent deformation or loosening, improve stability of the cable under high pressure or bending, spiral blades are clamped in the isolation sleeves to promote air circulation, improve heat dissipation performance, reduce heat accumulation, and reduce the risk of cable failure, the spiral blades also help maintain the shape of the isolation sleeves, prevent deformation caused by external pressure, and the combination of the support columns, the spiral blades and the isolation sleeves improves mechanical stability of the cable, which can withstand greater external impact or tension and ensure stable operation of the cable under high load.

The application provides a semiconductor device and a preparation method thereof, wherein the gate dielectric layer comprises a first edge region and a first central region, the thickness of the first edge region is greater than that of the first central region, and the source-drain region is formed in the semiconductor substrate on both sides of the gate dielectric layer. Since the thickness of the first edge region of the gate dielectric layer is greater than that of the first central region, the electric field intensity of the first edge region of the gate dielectric layer can be reduced, the longitudinal electric field intensity near the source-drain region is reduced, the injection energy of the electrons is reduced, the difficulty of the electrons to inject into the gate through the first edge region of the gate dielectric layer is increased, the hot carrier injection effect of the device is improved, the reliability of the device is improved, and the risk of circuit failure in the device is reduced.

The utility model discloses a wiring terminal with a buffer function, which comprises a wiring terminal body, the top of the wiring terminal body is provided with a plurality of groups of wiring grooves, and the interiors of the plurality of groups of wiring grooves are respectively provided with an anti-falling buffer assembly for preventing a lead from falling off. Wherein the upper base is in threaded connection with a first threaded hole of the lower base through a first bolt, so that a wire is clamped between the upper base and the lower base, the wire can be effectively prevented from falling off in the wiring process, the wiring stability and reliability are improved, circuit faults and potential safety hazards caused by wire falling off are reduced, and the service life of the wire is prolonged. Wherein a buffer piece in the anti-falling buffer assembly enables the lead to absorb and disperse external impact force through elastic deformation of a buffer structure even if the lead is subjected to external tension or vibration after being installed, and plays a role in buffering and protecting the wiring terminal and the lead connected with the wiring terminal.

This utility model discloses a floor-standing networked signal cabinet for controlling traffic lights, relating to the field of control cabinet technology. The utility model includes a protective cabinet, a control cabinet, and an adjustment component. The adjustment component includes two baffles; a connecting shaft connects the two baffles; a semi-circular plate is fixed to the side of the connecting shaft; a cylindrical plate is fixed to the bottom of the semi-circular plate; a partition is fixed to the inner wall of the control cabinet; a circular groove is formed on the surface of the protective cabinet; an air inlet slot and an air outlet slot are formed through one inner wall of the control cabinet; the other inner wall of the control cabinet is connected to the interior of the protective cabinet; a fan is rotatably mounted on the partition. This utility model uses a sliding adjustment component to move the baffles, and simultaneously, the baffles drive a gear through a rack and pinion to change the direction of airflow, thereby regulating the humidity inside the protective cabinet. This prevents excessively low humidity from causing static electricity in electrical appliances, circuit failures, and data loss, or excessively high humidity from causing rust, short circuits, aging, and battery leakage in electrical appliances.

The invention relates to the technical field of battery testing, in particular to an open-circuit failure testing device for a new energy automobile battery in a high-temperature environment, which comprises a rack, a bearing table for placing the battery is fixed on the rack, first side heating plates are symmetrically arranged on two sides of the bearing table, and a second side heating plate is arranged on one side of each first side heating plate. An upper heating plate, a first side heating plate, a second side heating plate and the upper heating plate are arranged above the bearing table, and heating elements for heating a battery are fixedly mounted on the first side heating plate, the second side heating plate and the upper heating plate; the two first side heating plates are arranged on the rack in a sliding mode, the upper heating plate is fixed to a lifting rod, and the lifting rod is driven to ascend and descend through a first driving mechanism arranged on the rack. Therefore, the heating intensity can be conveniently and linearly controlled, different high-temperature environments are accurately simulated, and the efficiency and accuracy of the high-temperature open-circuit failure test of the battery are effectively improved.

The application discloses a temperature sensing type power line and an electric water heater. The temperature sensing type power line comprises a power line body and a power plug. The power line body comprises a first body, an input end of which is connected with the power plug; a second body, an output end of which is used for being connected with an electric device; and a temperature sensing circuit breaking device, which is used for sensing the temperature of the electric device and cutting off the circuit of the power line when the temperature reaches a set value. The input end and the output end of the temperature sensing circuit breaking device are connected with the output end of the first body and the input end of the second body respectively. The temperature sensing type power line has the temperature sensing function, can automatically cut off the circuit when the sensed temperature reaches the set value, plays a role of protecting the circuit and the electric device, guarantees the life and property safety of the user, increases the service life of the power line and the electric device, reduces the probability of the circuit failure, and guarantees the life and property safety of the user.

The invention provides a low-conduction-loss direct-current circuit breaker with a fault type judgment function and a judgment method, and belongs to the field of circuit fault detection. In order to solve the problems that in an existing hybrid high-voltage direct-current circuit breaker, the conduction loss of a load commutation switch is high, and a circuit device does not have the fault type discrimination capability, the direct-current circuit breaker comprises a load branch, a multifunctional branch, a main breaking branch and an energy absorption branch. The discrimination method comprises the following steps: in a normal operation mode, a load branch is conducted; the capacitor pre-charging mode operates in parallel to charge the capacitor C; when the circuit is short-circuited, a thyristor turn-off mode is entered, and the T1 is turned off; and entering a load commutation mode, converting the fault current to a main breaking branch, introducing an energy absorption branch, and entering an energy absorption mode. And injecting a controlled RLC oscillation current, analyzing current waveform characteristics to judge a direct current fault type, and performing reclosing or maintenance of the circuit breaker according to the analyzed direct current fault type.

The utility model relates to the technical field of electrical connection devices, in particular to an arc extinguish chamber of a universal circuit breaker and the universal circuit breaker. The arc-extinguishing chamber comprises a first arc-isolating wall, a second arc-isolating wall, an arc-extinguishing grid group, an arc-extinguishing cover and a sealing structure. The sealing structure comprises a first sealing part and a second sealing part, and the first sealing part is arranged on the side, away from the second arc isolating wall, of the first arc isolating wall and located at the end, close to the cover plate, of the first arc isolating wall. The second sealing part is arranged on the side, away from the first arc-isolating wall, of the second arc-isolating wall and located at the end, close to the cover plate, of the second arc-isolating wall. The first sealing part is arranged on the outer side of the first arc isolation wall, and the second sealing part is arranged on the outer side of the second arc isolation wall, so that a gap between the arc extinguish chamber and the cavity wall at the opening of the arc extinguish chamber mounting cavity can be effectively blocked, electric arcs can be prevented from escaping from the gap at the opening, the safety of the universal circuit breaker is improved, and the service life of the universal circuit breaker is prolonged. And circuit faults are reduced.

The application provides a power circuit, a fault diagnosis method and a power electronic device, and relates to the technical field of power electronics. The technical scheme provided by the application can analyze the fault type based on the diagnosis data of the diagnosis voltage within the preset time before and after the moment when the IGBT fails, so that the fault type of the power circuit can be quickly and accurately located, and the fault maintenance cost of the power electronic device is effectively reduced. Moreover, the power circuit provided by the embodiment of the application has a simple structure and no use limit, and is suitable for different types of power scenarios.

This utility model discloses a circuit breaker, belonging to the field of low-voltage electrical technology. The circuit breaker includes a contact structure and a leakage current test circuit. The contact structure includes a first moving contact and a conductive rod electrically connected to the first moving contact. The leakage current test circuit includes a test resistor and a spring contact. The test resistor has a first lead, and the first lead and the end of the conductive rod facing the spring contact are both abutted against and electrically connected to the first surface of the spring contact. The circuit breaker provided by this utility model adopts a lap-connection power extraction method to electrically connect the test resistor and the first moving contact, so as to realize the leakage current test circuit extracting power from the first end of the test resistor, effectively reducing the use of wires, that is, reducing the number of wire connection points and soldering points, reducing the risk of short circuit and leakage current test circuit failure, facilitating assembly, and effectively reducing manufacturing costs.

The utility model belongs to the technical field of power transmission line fault alarms, and particularly relates to a power transmission line grounding fault troubleshooting alarm which comprises a circuit fault detector, a loudspeaker is arranged on one side, close to the upper end, of the front end face of the circuit fault detector, and guide plates are fixedly connected to the two sides of the circuit fault detector. The two guide plates are slidably connected with supporting plates, the two supporting plates are rotatably connected with mounting shafts, a wireless display is fixedly connected between the two mounting shafts, a display screen is fixedly arranged on the outer wall of the wireless display, sliding grooves are formed in the supporting plates, sliding plates are slidably connected in the sliding grooves, and clamping rods are fixedly connected in the sliding plates. Under the action of mutual cooperation of the guide plate, the sliding groove, the sliding plate, the clamping rod, the supporting plate, the clamping hole, the mounting shaft, the wireless displayer and the display screen structure, the display screen can be prevented from being damaged due to collision.

The invention discloses a series-parallel connection combined tantalum electrolytic capacitor, and belongs to the technical field of electronics, limiting sleeves are distributed on a bottom plate, limiting blocks are installed around the inner rings of the limiting sleeves, capacitors are placed in the limiting sleeves and the limiting blocks, and limiting partition plates are installed at the positive and negative ends of the capacitors. Limiting holes for leading out the positive and negative ends of the capacitor are formed in the limiting partition plates, wire limiting pieces are installed at the corresponding positions of the limiting holes, an assembling cavity is formed in the capacitor containing piece, placing frames are symmetrically installed at the upper end of the assembling cavity, the limiting partition plates are placed and connected through the placing frames, and the capacitor in the cavity is accurately pressed and positioned through the limiting partition plates. The capacitor is ensured to be stable and displacement-free in subsequent assembling and using processes, meanwhile, the influence of contact friction and electric field interference on the service life of wires is effectively reduced, circuit faults caused by early aging of the wires are avoided, and the operation stability and the service life of the whole device are remarkably improved.

The invention relates to a pressure-sensitive electrode, a pressure-sensitive resistor assembly and a surge protection device, and belongs to the technical field of pressure-sensitive resistors. The surge protection device comprises a piezoresistor assembly, the piezoresistor assembly comprises a voltage-sensitive electrode, the voltage-sensitive electrode comprises an electrode body and a welding boss, the welding boss is arranged on the connecting side of the electrode body, the connecting side of the electrode body is provided with a first blocking groove, and the first blocking groove blocks the periphery of the welding boss in partial or all directions. According to the pressure-sensitive electrode, the pressure-sensitive resistor assembly and the surge protection device provided by the invention, the connecting side of the electrode body is attached to the gasket, the invasion interval is formed between the connecting side of the electrode body and the gasket, and in the invasion interval, the direction from the welding boss to the edge of the electrode body is the invasion direction; the first blocking groove can block a capillary phenomenon water absorption path of liquid water in the invasion direction. Through the arrangement, moisture can be effectively prevented from flowing to the edge of the ceramic of the piezoresistor along the surface of the electrode body, and the piezoresistor is prevented from being affected with damp and being short-circuited and invalid.

The utility model relates to the field of power distribution cabinets, in particular to a power distribution cabinet protection device, which comprises a protection box body, a main body used for providing protection capability for a power distribution cabinet, fixing bolts and reinforcing plates penetrating through two sides of the outer part of the protection box body and used for threaded connection, and outer impact pads are fixedly arranged outside the reinforcing plates. The power distribution cabinet protection device is provided with the reinforcing plate, the outer impact pad, the high-frequency current transformer, the temperature sensor, the inner protection frame, the vacuum arc extinguish chamber and the vacuum fuse switch. The protection box body, the external reinforcing plate and the external impact pad enhance the impact resistance and protection capability of the power distribution cabinet, physical protection is formed outside the power distribution cabinet, then the high-frequency current transformer and the temperature sensor are further arranged on the two sides of the power distribution cabinet components inside the power distribution cabinet body, and the high-frequency current transformer is used for detecting internal circuit faults.

In the field of medical or healthcare equipment technology, we provide a combination type pie-shaped electronic heating device. [Solution] The number of combined pie-shaped electric heating devices is an odd number greater than 3, some of which are active pie-shaped electric heating units 6, and the other part is a passive pie-shaped electric heating unit 7. The pie-shaped electric heating unit includes a top cover, a bottom case, magnetic steel, an electronic heating temperature control PCB substrate, and associated epoxy filler. The top cover is fixedly connected to the bottom case and together forms the outer shell of the pie-shaped electric heating device, and the inside of the outer shell of the passive pie-shaped electric heating unit is filled only with high heat capacity filler. This invention divides the total number of pie-shaped electric heating devices into two types with different functions and uses the built-in magnetic steel to attract and stack them together, forming a compact whole. This significantly reduces the overall manufacturing cost of the system and potential circuit failure points, as well as effectively extending the effective heat supply duration of the entire device, improving the continuity of the user experience. Furthermore, it helps in the uniform transfer of heat within the combined device, avoiding localized overheating or underheating problems.

The application provides a data reading circuit of an MRAM chip, comprising: a to-be-tested storage unit, a first gating transistor connected in series with the to-be-tested storage unit, a reference unit, a second gating transistor connected in series with the reference unit, and a readout amplifier, wherein the reference unit has three optional reference resistance branches, including a working mode branch, a first test mode branch and a second test mode branch, the working mode branch is used for reading data of the to-be-tested storage unit, the first test mode branch is used for screening out fixed failure units and high-resistance state out-of-range failure units with an open-circuit failure type, and the second test mode branch is used for screening out fixed failure units and low-resistance state out-of-range failure units with a short-circuit failure type.

The application discloses an airbag ignition loop fault detection method and device, a storage medium and a program product. The method comprises the following steps: in response to an airbag fault detection request, obtaining a data storage address symbol; determining an airbag data storage address according to the data storage address symbol; obtaining a current loop resistance value of at least one airbag ignition loop according to the airbag data storage address; and performing fault detection on each airbag ignition loop according to the current loop resistance value of each airbag ignition loop and the type of the corresponding airbag, to obtain a fault detection result of each airbag ignition loop. The method can obtain the fault type and fault point of each ignition loop by obtaining the current loop resistance value of the ignition loop and the type of the corresponding airbag, thereby saving the time for troubleshooting each ignition loop.

The invention relates to the technical field of transformers, in particular to a fixed efficient dry-type transformer which comprises a base, a transformer box is fixedly mounted at the top of the base, a mounting table is mounted in the middle of the transformer box through bolts, and a transformer body is mounted at the top of the mounting table through bolts. During the application period of the technical scheme, through pure physical driving design, no extra electric appliance structure is needed, dynamic fire extinguishing is driven by fusible alloy fusing plug triggering and fire extinguishing agent kinetic energy, the overall use and subsequent maintenance cost is reduced, the circuit failure risk is avoided, the dynamic fire extinguishing structure achieves all-directional fire source covering, cooperative supply is achieved, and it is guaranteed that the fire extinguishing agent is sufficient; the dry powder fire extinguisher has the functions of rain prevention, heat dissipation, convenient maintenance and the like, solves the problems of high cost, low fire extinguishing efficiency, insufficient reliability and the like in the prior art, gives full play to the efficiency of the dry powder fire extinguisher, and meets the fire protection requirement of the dry power transformer.

The invention discloses a power supply circuit fault diagnosis and analysis system based on frequency domain feature extraction, and relates to the field of power supply circuit fault diagnosis. The method comprises the following steps: acquiring output voltage and output current time domain signals in a power supply circuit operation state, and obtaining a switching frequency; short-time test disturbance is injected by superposing a test modulation signal in a switch driving signal, and a power supply circuit generates corresponding frequency domain response under the condition that steady-state power supply of a power supply is not changed; performing frequency domain transformation on the acquired signal, extracting a voltage amplitude, a current amplitude and a phase difference at a test disturbance frequency, and calculating an equivalent series resistance and an equivalent capacitance based on a preset capacitor series impedance model; and determining the capacitance degradation degree according to the variable quantity of the parameter relative to the reference parameter, and outputting a fault diagnosis result. According to the invention, online measurement of capacitance parameters can be realized in the normal operation process of the power supply, the reliability of parameter identification is improved, and support is provided for maintenance of a power supply system.

The invention discloses a data analysis system and method applied to power fault detection, and relates to the technical field of circuit fault detection.The method comprises the steps that multi-source core data are collected in a segmented mode and preprocessed, and a target feature set is obtained through scene admission judgment, homology verification and time sequence rationality verification; carrying out correlation logic analysis on the pressure value, the contact area value and the wire resistance variation based on the target feature set, and outputting a logic analysis result; according to a logic analysis result, respectively establishing corresponding relations among the contact area value, the pressure value and the lead resistance influence quantity, and integrating the two corresponding relations to construct a lead resistance total influence quantity calculation model; and substituting the pressure value and the contact area value which are acquired in real time into the model, and completing fault grading judgment according to the obtained total influence quantity of the wire resistance.

This application discloses an open / short circuit protection circuit for electrical stimulation output and an electrical stimulation therapy device; relating to the field of electronic circuits, it solves the problem of misjudgment caused by the inability to distinguish between short circuits and open circuits in electrical stimulation therapy devices. Through a sampling control circuit, a trigger signal is output when the PWM signal is high, and remains silent when it is low. After receiving the trigger signal, the sampling processing module immediately collects current and voltage signals, performs calculations and judgments, and sends the results to the controller. Based on the open / short circuit judgment results sent by the sampling processing module, the controller executes corresponding protection operations. The connection between the sampling control circuit and the sampling processing module enables precise control of the sampling timing, improves the real-time performance and accuracy of signal acquisition, ensures timely measures to protect patient safety in the event of an open circuit or short circuit, and reduces the risk of treatment interruption or failure due to circuit faults.

According to the present invention, each of a plurality of unit converters comprises: a main circuit (30); a control circuit (32) configured to control a plurality of switching elements (11-14) according to control signals received from a control device; a power source (50) that steps down the voltage of a first capacitor (15) to generate a power supply voltage and supplies the power supply voltage to the control circuit (32); and a current-limiting resistor circuit (80) that is disposed between the main circuit (30) and the power source (50) and has a variable resistance value. The power source (50) comprises a second capacitor (51), an overcharge suppression circuit (54), a power supply circuit (56), and a control unit (500). The control unit (500) includes: an overcharge suppression control circuit (53) that controls the overcharge suppression circuit (54) in accordance with the magnitude of the voltage of the second capacitor (51); a current-limiting resistor switching circuit (83) that switches the resistance value of the current-limiting resistor circuit (80) in accordance with the magnitude of the voltage of the first capacitor (15); and a short-circuit failure detection circuit (200) that detects a short-circuit failure of at least one switch of the current-limiting resistor circuit (80) on the basis of the duty of a switching signal and the magnitude of the DC voltage of the first capacitor (15).

The utility model discloses a cross-country motor home heaven and earth door which comprises a door frame, a first vehicle door, a second vehicle door, a gangway ladder, a first connecting seat, a second connecting seat, a second connecting seat, a third connecting seat, a fourth connecting seat, a fourth connecting seat, a fifth connecting seat and a sixth connecting seat, the first vehicle door is hinged to the door frame, the second vehicle door is hinged to the door frame and located below the first vehicle door, and the gangway ladder is installed on the second vehicle door; the first connecting rod is movably connected with the first connecting seat, and a handle is arranged on the first connecting rod; one end of the second connecting rod is movably connected with the first connecting rod; the other end of the second connecting rod is connected with the gangway ladder or the second vehicle door. According to the utility model, the door opening or closing is not limited by circuit faults, and the hidden danger of safely opening or closing the door is eliminated.

The invention discloses a circuit fault detection device, an embedded system and a circuit fault detection method, and belongs to the field of electronics. The circuit fault detection device comprises an interrupt management module, an interrupt statistics module and a fault judgment module, the interrupt management module is coupled with the interrupt statistics module, and the interrupt statistics module is coupled with the fault judgment module; wherein the interrupt management module is used for receiving an interrupt signal sent by a circuit to be detected, and the circuit to be detected is a circuit adopting an interrupt mechanism; the interruption counting module is used for counting the interruption times of the to-be-detected circuit, wherein the interruption times are the times that the to-be-detected circuit sends interruption signals in a target detection period; and the fault judgment module is used for obtaining a fault judgment result of the circuit to be detected based on the interruption times.

Temperature-aware built-in self-test (BIST) control system for selectively controlling activation of BIST circuits in a processor-based system to maintain temperature limit and related methods. The temperature-aware BIST control system is configured to selectively control the number of BIST circuits in the processor-based system activated during the same time based on a temperature limit indicator related to a sensed temperature(s) in the processor-based system and whether such is within a defined temperature threshold(s) and / or temperature change rate threshold(s), which may be programmable. In this manner, the safety manager circuit can dynamically and selectively control the number of BIST circuits activated based on temperature according to the BIST control policy(ies) to reduce or avoid circuit failures due to excess temperature, while at the same time maximizing the staggering (i.e., overlapping) of BIST circuit activations to maximize testing speed.

A failure detection circuit (103) for detecting an abnormality in an inrush current prevention circuit (102) which includes an inrush resistor (200) and an inrush relay (201) that are arranged in parallel comprises: a resistive voltage divider circuit (301) that divides a voltage across both ends of an inrush current prevention circuit (102); an amplification circuit (302) that amplifies the difference between the voltages obtained by dividing the voltage by the resistive voltage divider circuit (301); a peak hold circuit (303) that performs temporary peak hold of the voltage divided by the resistive voltage divider circuit (301); and a control unit (304) that, on the basis of respective signals output from the amplification circuit (302) and the peak hold circuit (303), detects a disconnection failure of the inrush resistor (200), a short-circuit failure of the inrush relay (201), and an open failure of the inrush relay (201), wherein the amplification circuit (302) and the peak hold circuit (303) are connected in parallel between the resistive voltage divider circuit (301) and the control unit (304).

The present application relates to a kind of short-circuit resistance test and evaluation method of crimping package power device, belong to the technical field of power electronics device.The method includes: S1: build test platform;S2: obtain the voltage grade, pressure loading, environmental temperature and maximum junction temperature fluctuation range under actual application condition of the device to be measured;S3: respectively carry out short-circuit resistance test of crimping package device under different voltage, pressure, temperature grade, real-time monitoring the change of device short-circuit current, collector voltage and gate voltage, until power device short-circuit failure, corresponding to obtain the relationship of voltage and short-circuit critical energy and critical temperature, the relationship of pressure and short-circuit current, the relationship of temperature and short-circuit current;S4: according to test result, obtain the relationship of short-circuit resistance of crimping package device to be measured and voltage, pressure, temperature.The present application considers the special application condition of crimping package power device, improves the accuracy of short-circuit resistance test and evaluation of crimping package power device.