446 results about "Circuit Failure" patented technology

The invention relates to the technical field of circuit monitoring, in particular to an intelligent sensing and identifying method for circuit faults of a semiconductor hybrid solid-state circuit breaker. Obtaining a fluctuation abnormal moment according to the amplitude characteristic and the continuous characteristic of the current fluctuation in the current time sequence curve; obtaining a suspected current anomaly moment according to the difference characteristic of the fluctuation anomaly degree of the fluctuation anomaly moment and the same historical moment; clustering is carried out according to the current characteristics and fluctuation characteristics of all suspected current abnormal moments in the current time sequence curve, and different clusters are obtained; obtaining the current anomaly degree of the clustering cluster according to the quantity characteristics of the suspected current anomaly moments in the clustering cluster and the distance characteristics in the clustering space; obtaining a current abnormity moment according to the current abnormity degree; a fault characteristic value is obtained according to the distribution characteristic of the current abnormity moment and the change characteristic of the current abnormity degree in the current time sequence curve, and circuit fault identification is carried out, so that the working stability of the circuit breaker is improved.

The invention discloses a crosslinked polyethylene sheath insulation variable frequency cable, and relates to the technical field of cables, and the cable comprises a cable assembly, a temperature sensing mechanism penetrates through the center part of the inner side of the cable assembly, and a plurality of first heat dissipation assemblies are distributed on the side wall of the cable assembly in the circumferential direction at equal intervals; a second heat dissipation assembly is arranged between every two adjacent first heat dissipation assemblies. The temperature sensor is distributed in the middle of the inner side of the filling layer, and the wire conductors are annularly distributed on the inner side of the filling layer, so that the temperature sensor is arranged in the center between the wire conductors, and the temperature sensor can monitor the temperature generated by the wire conductors; according to the utility model, data can be transmitted to the controller through the sensing circuit, and the wire conductor stops working through analysis and control of the controller, so that the temperature is reduced, and the situation that the circuit cannot be normally used when the circuit fails or overload occurs due to overhigh load is avoided.

The invention discloses a heat dissipation system with an anti-permeation layer and electronic equipment. The heat dissipation system comprises a substrate, a shell and at least one anti-permeation layer, and a heating element is arranged on the substrate. The shell is connected to the substrate, a containing space used for being filled with a cooling working medium is defined between the shell and the substrate, and the heating element is arranged in the containing space. At least part of the anti-permeation layer covers the surface, exposed out of the containing space, of the substrate and further covers the connecting position of the shell and the substrate and the connecting position of the heating element and the substrate. According to the application, through the arrangement of the anti-permeation layer, circuit failure and influence on signal transmission caused by the fact that the cooling working medium permeates into the substrate can be avoided, and the problem of sealing failure caused by accelerated aging of the adhesive layer between the substrate and the shell due to long-term soaking of the cooling working medium can also be avoided.

Aspects of this disclosure relate to a power amplifier system with symbol-based envelope tracking and fault protection. The system can include a power amplifier and a voltage modulator. The voltage modulator can include switches configured to provide the bias voltage and to provide electric circuit breaker protection. The voltage modulator can include a fault detection circuit that can cause a switch of the switches to provide electric circuit breaker protection in response to detecting a circuit fault. Related methods and voltage modulators are disclosed.

The invention relates to the technical field of analog current fault diagnosis, in particular to an analog current fault diagnosis method based on redundancy feature suppression, which comprises the following steps: acquiring voltage and current data of a circuit output position according to a circuit simulation model, and constructing a circuit fault state data set according to the voltage and current data; performing time-frequency analysis on the circuit fault state data set through discrete wavelet transform; performing redundant feature suppression processing on the hierarchical frequency domain component set to obtain a circuit fault state data feature set; a DCNN-BiLSTM model is constructed, the DCNN-BiLSTM model is trained according to the circuit fault state data feature set, and the DCNN-BiLSTM model meeting a preset fault diagnosis correct rate is output as an analog power fault diagnosis model; and obtaining target to-be-detected voltage and current data, and performing analog current fault diagnosis on the target to-be-detected voltage and current data according to the analog current fault diagnosis model to obtain a corresponding fault type classification result. According to the invention, redundant features can be effectively suppressed, and the accuracy of analog power supply fault diagnosis is remarkably improved.

A power stage includes a control device and a power transistor, the control device comprising a primary circuit comprising: a control module able to generate a control current, a primary circuit malfunction detector able to detect a malfunction, a pulse transformer comprising a primary winding connected to the primary circuit, comprising a secondary winding connected to the secondary circuit, magnetically coupled to the primary winding and able to generate, from the control current, an induced pulse current making it possible to drive the power transistor, a secondary circuit comprising: a power and fault detection controller able to detect a malfunction of the secondary circuit or of the power transistor, the power and fault detection controller being able to communicate the malfunction of the secondary circuit or of the power transistor to the primary circuit malfunction detector.

The present invention relates to the technical field of disconnectors, and discloses an electric operating device for a high-voltage disconnector, comprising a switch assembly, a support seat, a rotating rod rotatably connected in the support seat, a drive sleeve fixed at the end of the rotating rod, and a drive plate fixed on the surface of the drive sleeve; an operating assembly, arranged on one side of the drive plate, comprising a separation and combination member, a support shell arranged on one side of the drive plate, and a screw rod rotatably connected in the support shell. The beneficial effects of the present invention are as follows: 1. The first spring is compressed or stretched by the screw rod, and the drive plate is driven to move quickly by the spring reset elastic force, so as to realize the rapid separation and closing of the knife switch, reduce the generation of arc, reduce the wear of the contacts, and extend the service life of the equipment; 2. An emergency disconnect mechanism composed of a reset member and an electromagnet is provided. When a circuit fails, the electromagnet drives the limit release, and the tension of the seventh spring prompts the reset block to push the moving seat, quickly opening the knife switch, avoiding the expansion of the fault, and ensuring the safety of the power system.

The invention relates to the technical field of wire harness terminal tension testing, and discloses an automobile wire harness terminal tension testing device which comprises testing equipment, a controller, a display screen and a workbench are arranged on the testing equipment, and a wire harness fixing mechanism, a terminal fixing mechanism and an automobile vibration simulation mechanism are arranged on the workbench; the wire harness fixing mechanism comprises a plurality of bearing frames arranged on the workbench in a sliding mode, electric push rods are installed on the upper surfaces of the bearing frames, an upper pressing plate is fixed to the output ends of the electric push rods, and a driving traction mechanism used for driving the bearing frames to move synchronously is arranged in the workbench. According to the invention, the wire harness fixing mechanism, the terminal fixing mechanism and the automobile vibration simulation mechanism are arranged, and the wire harness fixing mechanism and the terminal fixing mechanism can be used for fixing a wire harness part and a terminal part respectively, so that whether the connection strength of a terminal and a wire reaches the standard or not can be detected; circuit faults caused by connection loosening or falling in the using process are avoided.

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 invention relates to the technical field of electric car braking, and discloses an electric car braking system based on multi-redundancy guarantee and self-adaptive control and a control method, and the electric car braking system comprises a redundant circuit module, a distributed driving module, an efficient transmission module and a self-adaptive control center. The reliability is remarkably improved, seamless switching of a main circuit and a standby circuit within 50 ms is achieved through a circuit dual-redundancy architecture, the distributed multi-motor driven torque reconstruction algorithm is matched, the braking efficiency retention rate under a single fault is improved, the circuit fault survival rate reaches 100%, the braking efficiency and safety are optimized, the mechanical loss is reduced to 8% or below through an efficient transmission module, and the reliability is improved. The braking distance of 100 km / h is shortened to 29 m, the energy utilization efficiency is improved, the energy consumption is further reduced through the low-friction transmission design, the dynamic adaptability and the collaboration are enhanced, a self-adaptive control center solves the multi-system instruction conflict through multi-sensor fusion and fuzzy PID adjustment with the sampling frequency of 1 kHz, the braking stability is improved by 40% or above, and the braking stability is improved by 20% or above. And the response time of the key control instruction under the emergency working condition is shortened to 75mS.

The utility model discloses a waterproof bathroom controller. The waterproof bathroom controller comprises a fixed seat; the connecting assembly is connected to the fixing base and comprises a first connecting base, and a first mounting groove is formed in the side, facing the fixing base, of the first connecting base; the first circuit board is mounted in the first mounting groove and is sealed with the first mounting groove through glue pouring; and the adjusting device is mounted on the first circuit board so as to linearly adjust or switch and adjust the output parameters of the electrical equipment. The glue filling sealing structure provides a waterproof barrier for the first circuit board, circuit faults caused by water vapor erosion are effectively prevented, and the service life of equipment is prolonged. Moreover, the setting of the adjusting device allows the user to adjust the output parameters of the electrical equipment in a linear adjustment or switching manner, such as opening and closing control, water flow adjustment and water temperature adjustment, so that the convenience of operation is ensured, the reliable operation of the controller under a humid condition is ensured, safe and stable intelligent shower experience is provided for the user, and the user experience is improved. The waterproof paint is especially suitable for a bathroom environment with high requirements on waterproof performance.

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 invention relates to the technical field of circuit breakers, and discloses a circuit breaker with a clapping type tripping assembly, which comprises a shell, an inner cavity of the shell is rotatably connected with an operating rod, a gas generation assembly is fixedly mounted at the bottom end of the inner cavity of the shell, and driving assemblies are arranged at the front end and the rear end of the operating rod. And a blowing assembly is fixedly mounted on the left side of the gas generation assembly. The gas box is arranged in the shell, when a circuit fault occurs, the operation rod rotates to drive the gear ring to rotate, then the first rack, the extension rod and the lifting plate are driven to move downwards, gas in the gas box is squeezed into the one-way gas outlet pipe, the gas is sprayed out upwards through the spray head, an arc is pushed by gas flow to quickly pass through the arc chute, and the arc extinguishing effect is achieved. And the arc extinguishing speed is improved.

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.

The invention relates to the technical field of capacitors, in particular to a supercapacitor core package, a preparation method thereof and a supercapacitor. The preparation method of the super capacitor core package comprises the following steps: preparing a moisture absorption electrode with the water content of 20%-30%; freezing the moisture absorption electrode to obtain a micro-ice crystal electrode; and drying the micro-ice crystal electrode, winding the micro-ice crystal electrode and a diaphragm to form a super capacitor core cladding intermediate, and fixing the super capacitor core cladding intermediate through an elastic piece to obtain the super capacitor core cladding. According to the super capacitor core package, the tail diaphragm can be prevented from being broken and damaged, the assembled super capacitor is not prone to short-circuit failure, and the self-discharge performance, the high-temperature durability and the cycling stability of the super capacitor core package are superior to those of a super capacitor assembled according to an existing process.

The invention provides a motor with a self-cleaning function, and relates to the technical field of motors. The driving control mechanism is mounted on one side of the motor main body; the movement control mechanism is mounted at the top of the motor main body; the wind power driving device is connected with the driving control mechanism; the movable suction device is connected with the movable control mechanism and the wind power driving device; the problems that a traditional brush is time-consuming and labor-consuming in cleaning, and a large amount of flying dust is generated in the cleaning process are solved; cleaning is not thorough, heat dissipation of the motor is affected, and if flying dust flies into the motor, part abrasion or circuit faults can be possibly caused, and potential damage to the motor is caused; the system does not need extra power access, and is energy-saving and convenient; the wind wheel rotates along with the motor, the pumping head generates negative pressure suction force and automatically slides in a reciprocating mode, cleaning is convenient, time and labor are saved, the problem of dust flying is avoided, part of heat on the surface of the motor can be discharged, and cooling of the motor is accelerated.

The utility model relates to the field of power electronics, in particular to a quick-response power supply switching control module, which comprises a power supply conversion unit, a manual switching unit and a load driving unit. According to the utility model, a switching circuit composed of a relay JK1, a contactor JK2 and a contactor JK3 is used and controlled by a controller S1 and a controller S2. When the controller S1 and the controller S2 are open-circuited, a contact 3-5 of the relay JK1 is closed, XQ1 + is connected to a 24V power supply, the contactor JK2 is closed, and the output is Out-1. And when the controller S1 and the controller S2 are short-circuited, a contact 3-4 of the relay JK1 is closed, XQ2 + is connected to a 24V power supply, the contactor JK3 is closed, and the output is Out-2. The control circuit controls the on-off of the current of the main circuit, the power supply and the load are isolated through the relay, the risk of circuit faults is reduced, the operation safety is ensured, meanwhile, the circuit complexity is reduced, the overall size is reduced, and the space utilization rate is improved.

The invention provides a system and a method for removing charges in liquid medicine, which are applied to the technical field of semiconductors. According to the invention, a small-flow liquid medicine circulation pipeline is additionally arranged on a machine table pipeline at the front end of the liquid medicine nozzle, and the liquid medicine circulation pipeline is grounded, so that as long as one path is grounded, charges in the liquid medicine in all branches can be conducted away along the path; therefore, charges in all the liquid medicine in the machine pipeline can be conducted away, the problem that when the liquid medicine nozzle sprays liquid medicine to the surface of a wafer, instantaneous high potential difference is generated, arc discharge defects are formed, and a circuit fails is solved, and the reliability, the electrical performance and the yield of products are improved. In addition, the method is simple and efficient, and is suitable for various liquid medicines, so that the method has relatively high mass production applicability.

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 utility model relates to the field of electrical instruments, and discloses a moisture-proof electrical instrument, which comprises a machine body, a terminal plug is detachably mounted on the inner wall of the machine body through a shielding assembly, a connecting wire is fixedly connected to the surface of the terminal plug, and a test pen is fixedly connected to one end, far away from the terminal plug, of the connecting wire. A winding assembly is arranged on the surface of the connecting wire, the shielding plate is elastically connected to the side wall of the inner side of the machine body through a reset spring, and a guide rod is fixedly connected to the inner wall of the machine body. According to the utility model, when a terminal plug is inserted, under the action of the reset spring, the trapezoidal block and the baffle plate can not only facilitate the insertion of the plug, but also elastically press the plug after the plug is installed, thereby effectively preventing moist air from entering the interior of a machine body from a connection part, greatly improving the moistureproof performance of instruments and meters, and prolonging the service life of the instruments and meters. Circuit faults caused by moisture are reduced, and the reliability and stability of instruments and meters are enhanced.

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 utility model discloses a welding-free structure of a power switch, which particularly relates to the technical field of power switches and comprises a power switch upper shell, a switch button is mounted at the top of the power switch upper shell, and a power switch lower shell is arranged at the bottom of the power switch upper shell. A dismounting mechanism is arranged between the power switch upper shell and the power switch lower shell; the disassembly and assembly mechanism comprises a connecting clamping groove which is formed in the surface of the bottom of the upper shell of the power switch. According to the utility model, through the arrangement of the dismounting mechanism, the rapid connection of the upper and lower shells of the power switch is realized, welding operation is not needed in the assembly process, the assembly efficiency is greatly improved, the production cost is reduced, the maintenance time and difficulty are reduced, and the welding-free structure avoids the problems of low installation efficiency and troublesome installation of fasteners such as screws and the like; and the problems of pseudo soldering, solder skips and the like possibly generated in the welding process are avoided, and circuit faults and potential safety hazards caused by poor welding are reduced.

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 application discloses a test device, method and system of an integrated gate-commutated thyristor (IGCT) converter valve, the integrated gate-commutated thyristor converter valve comprising at least a first integrated gate-commutated thyristor and a second integrated gate-commutated thyristor connected in series; a charging circuit comprising a first capacitor, a first inductor, a controllable switch and an isolation switch; a charging power supply connected to a first end of the first capacitor through the isolation switch, a second end of the first capacitor connected to a second end of a capacitor, and the first end of the first capacitor connected to a common end of the first integrated gate-commutated thyristor and the second integrated gate-commutated thyristor through the first inductor and the controllable switch connected in series; the charging circuit first charges the first capacitor, and then forms an oscillation loop with the first inductor to provide a charging current for the converter valve; and a current source circuit provides an alternating current and a direct current superimposed together for the common end, so that the test device can simulate a short-circuit failure process of an overvoltage breakdown of an IGCT converter valve.

The invention belongs to the technical field of integrated circuits, and particularly relates to an asymmetric switch applied to a satellite-borne wireless communication system. The circuit structure of the switch comprises an anti-radiation switch core circuit, a power detection circuit, an analog-to-digital converter and a control module circuit, an input signal is input to the anti-radiation switch core circuit, and an output signal is generated and output to the power detection circuit. The power detection circuit processes the received signal, outputs a processing result to the analog-to-digital converter, receives an instruction of the control module circuit and generates an output signal of the whole circuit; the analog-to-digital converter converts a processing result output by the power detection circuit into a digital signal and outputs the digital signal to the control module circuit; the control module circuit performs judgment according to the input digital signal, generates a control signal for controlling the working mode of the anti-radiation switch core circuit, and generates a control signal for controlling the power detection circuit and the analog-to-digital converter; the radiation-proof switch core circuit is composed of two paths of identical series-parallel asymmetric switches and three numerical control single-pole double-throw switches. Switching of the two switching circuits is controlled by a numerical control single-pole double-throw switch, and by means of the structure, the circuit failure probability caused by space irradiation can be remarkably reduced, and the anti-irradiation performance and stability of the circuit are improved.

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.