4679results about "Arrangements responsive to excess current" patented technology

The invention relates to a reverse polarity protected electronic circuit with a negative and a positive supply voltage line and with an electrical application circuit. The electrical application circuit has a positive and a negative power supply terminal. The reverse polarity protected electronic circuit comprises a reverse polarity protection circuit (1). The reverse polarity protection circuit (1) has a first and a second N-channel enhancement transistor as part of a reverse polarity protection transistor group (17). The first and second N-channel enhancement transistors are electrically connected in anti-series via a center terminal (86) of the reverse polarity protection circuit (1). The reverse polarity protection circuit (1) includes a control device (4) which is connected to the positive and negative supply voltage lines.Only when connected with the correct polarity does the control device (4) switch the first and second N-channel enhancement transistors of the reverse polarity protection transistor group (17) on. The control device (4) includes its own additional control reverse polarity protection circuit (81) which prevents damage to the control device (4) if connected with incorrect polarity, so that the control device (4) does not switch on the first and second N-channel enhancement transistors if connected with incorrect polarity.

A solid-state circuit breaker comprises an air gap, at least one counter and / or a timer, a memory, a radio and a microprocessor to: retrieve saved health data, alert data and counter, timer data from the memory, determine a status of a heath rating by data and comparing the heath rating to a threshold, if it is poor, send a message via a smart phone application (APP) and start a counter or timer, determine if the counter is at a predefined value and / or the timer is expired, if the counter is at a predefined value and / or the timer is expired, turn OFF the breaker and inhibit from being turned on, send a breaker OFF / disabled alert message using the radio to an end user / a customer via the APP, and if the counter is not at a predefined value and / or the timer is not expired, increment / decrement the counter and / or the timer.

The invention discloses a rapid fault positioning method, system and device based on three-section protection and FA cooperative protection, and a medium, and the method specifically comprises the steps: carrying out the detection and judgment through employing a preset three-section action rule, and obtaining a real-time protection action signal; acquiring action time sequence data of each protection device of the power distribution network in real time, constructing an FA fault feature matrix according to the action time sequence data, the electrical quantity information and the topological structure, analyzing time sequence association of the FA fault feature matrix by using an LSTM neural network, and generating an FA fault probability distribution diagram; based on the real-time protection action signal and the FA fault probability distribution diagram, a fault positioning algorithm is adopted for collaborative analysis, and a fault positioning result is obtained; and dynamically planning a load transfer path of the power distribution network by adopting a reinforcement learning algorithm according to a fault positioning result, and generating an optimal isolation and recovery scheme. The method is suitable for various complex power distribution network structures and operation modes, and can realize rapid and accurate fault positioning and processing under different fault conditions.

The invention discloses a primary current-rising protection system for a high-capacity transformer, which relates to the technical field of power transformation equipment and comprises an intelligent fault prediction module, a current-rising trigger monitoring module, a dynamic load adaptation module, an environmental influence evaluation module, a fault isolation and recovery module, a self-adaptive protection strategy module and a multi-dimensional alarm and response module. According to the primary current rising protection system for the high-capacity transformer, by introducing the intelligent fault prediction module, the dynamic load adaptation module, the environmental influence evaluation module, the self-adaptive protection strategy module and the like, comprehensive monitoring and intelligent protection of the high-capacity transformer can be achieved, and protection measures can be adjusted in real time through cooperative work of all the modules; the safety and reliability of the transformer under complex working conditions are remarkably improved, the occurrence rate of equipment faults is reduced, the self-learning capability is achieved, the protection strategy can be continuously optimized according to actual operation data, and it is ensured that the transformer is always kept in the optimal working state in various operation environments.

An intelligent circuit breaker system and method for managing overcurrent conditions includes a current sensor configured to measure electrical current applied to a power line load, a memory storing trip curve data, and a processor configured to evaluate the measured current against a pre-established threshold. Upon detecting an overcurrent condition, the processor starts a timer, evaluates the duration of the overcurrent against the trip curve, and disconnects the load when specified conditions are met. The system can dynamically adjust threshold values based on environmental factors, log operational data, and select appropriate trip curves for specific load types. A user interface provides real-time feedback on current values, timer status, and load disconnection events. Additionally, the system can automatically reset and reconnect the load upon return to safe operating conditions. The functionality is further embodied in a method and as computer-readable instructions for execution by a processor, providing a robust, adaptable, and efficient solution for modern overcurrent protection.

The invention discloses a power supply system of a server, a control method of the power supply system and the server, and relates to the technical field of servers, and the method comprises the steps that a detection control unit is integrated in a power converter, and the detection control unit collects current data of the output end of the power converter and amplifies the current data; whether the output end of the power converter is short-circuited or not is judged according to the amplified current data, so that weak abnormal current signals at the early stage of short circuit are easier to capture, the amplified current data can reach an overcurrent protection point more quickly, and the power converter is turned off before the actual short-circuit current at the output end of the power converter reaches a higher value. Instantaneous current generated by the input end of the power converter is reduced, the risk of triggering power failure of the preceding-stage first electronic fuse is reduced, the technical problem that normal operation of other functions of the server can be affected when the output end of the power brick is short-circuited is solved, and the technical effect that other functions of the server can normally operate when the output end of the power brick is short-circuited is achieved.

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.

Techniques are provided to utilize a common node of a solid-state AC switch as a DC ground reference node for DC power generation and control circuitry of an intelligent electrical device (e.g., intelligent dimmer switch, intelligent circuit breaker, etc.). For example, a device comprises a solid-state AC switch, and a power converter circuit. The solid-state AC switch comprises a first solid-state switch and a second solid-state switch which are coupled back-to-back to common node of the solid-state AC switch. The power converter circuit is coupled to the common node of the solid-state AC switch and is configured to convert an AC voltage to a DC voltage. The common node of the solid-state AC switch is utilized as a DC ground node of the power converter circuit, and the DC voltage output from the power converter circuit is ground referenced to the common node of the solid-state AC switch.

Solid-state circuit breakers (SSB) have a fault current limiting function that limit the fault current in power applications. It allows sustained overcurrent for a certain period while preventing the fast fault current increase in dc systems. For the conventional method of using switches alone to limit the current, the high loss results in a short withstand time and low current limiting capability of the SSCBs. Disclosed are various embodiments for a control strategy to use one or more energy absorption components to handle the major part of the energy during a current limiting stage to increase the current limiting capability for series-connected SSCB switching cells.

The embodiment of the invention provides a power supply device, a power supply system and a method, and the power supply device comprises a power supply bus which is connected with the output end of a voltage conversion unit through a bidirectional isolation unit and is connected with a low-voltage battery through another bidirectional isolation unit, the bidirectional isolation unit is used for controlling connection and disconnection between the bus and the voltage conversion unit or the low-voltage battery, the bidirectional isolation unit comprises two switches which are connected in series, the two switches which are connected in series are respectively connected with a diode in parallel, and the two diodes are arranged in a back-to-back manner; the power supply device further comprises another circuit which is electrically connected with the bus and used for supplying power to the load. The scheme of the embodiment of the invention can be applied to new energy vehicles such as electric vehicles and hybrid electric vehicles, and the function safety performance of power supply of the vehicles can be improved.

The invention discloses a protection circuit, a control method and a photovoltaic system, and belongs to the technical field of power electronics. The invention provides a protection circuit which is applied to a three-phase inverter circuit, the direct current side of the three-phase inverter circuit is used for being connected with a power supply assembly, the output end of each phase is provided with a relay assembly, and the protection circuit comprises a controllable power device which is connected with a bridge arm in the three-phase inverter circuit in parallel; the fault detection module is electrically connected with the three-phase inverter circuit and is used for generating a fault signal when the fault of short circuit to ground is detected; the current detection circuit is used for detecting the output current of each phase of the three-phase inverter circuit; and the controller is electrically connected with the fault detection module, the current detection circuit and the relay, controls the controllable power device to be switched on after receiving a fault signal, and disconnects the relay assembly of each phase when the output current of each phase meets a zero-crossing condition, so that the relay assembly can be ensured to be switched off safely, and a loop of short-circuit current can be cut off. And the short-circuit current is prevented from damaging components in the circuit.

A circuit breaker protecting an electric low-voltage circuit includes a housing with grid-side and load-side connections and a series circuit of a mechanical isolating contact unit on the grid side and an electronic interruption unit on the load side. The mechanical isolating contact unit has a handle opening and closing contacts. A current sensor unit is disposed in a conductor between the isolating contact unit and the interruption unit, for ascertaining a current level of the low-voltage circuit. A control unit is connected to the current sensor unit, electronic interruption unit, and mechanical isolating contact unit. When current and / or current / time thresholds are exceeded, prevention of a current flow in the low-voltage circuit is initiated. A power supply unit supplying energy to the circuit breaker is connected to conductors of the low-voltage circuit between the isolating contact unit and the interruption unit.

An integrated electrical management system includes an electrical panel, at least one busbar mounted to the electrical panel, at least one controllable breaker electrically coupled to the at least one busbar, and processing equipment configured to process electrical signals. The processing equipment includes control circuitry configured to control the at least one controllable breaker, and one or more current sensing modules configured to sense a respective current for each of the at least one controllable breakers. The system senses currents or otherwise electrical load in branch circuit, and is configured to control the breakers on or off to control electrical load in each branch circuit. The system may receive user input, input from devices, input from other systems or network entities, or inputs from sensors, and in response determines operating parameters. Operating parameters may include on-off schedules for breakers, temporal information, fault information, or other suitable operating parameters.

A plurality of systems of protection circuits are supported without changing a layout in a switching element. A semiconductor device includes a main switching element including a MOSFET and a sense switching element having a smaller area in plan view than the main switching element and for detecting current flowing through the main switching element. A first gate terminal that is a gate terminal of the sense switching element is arranged between a second gate terminal that is a gate terminal of the main switching element and a source terminal of the sense switching element.

A ground fault detection apparatus is used for an on-board system. The on-board system includes a power source unit, a power storage unit, a conductive path, and a disconnection unit. The conductive path includes a first conductive path, a second conductive path, and a third conductive path. The disconnection unit includes a first disconnection unit and a second disconnection unit. A second load is connected to one path out of the second conductive path and the third conductive path, and a third load is connected to the other path. The ground fault detection apparatus includes a detection unit (a current detection unit and a control circuit) configured to detect a ground fault on at least one of the second conductive path and the third conductive path.

The invention discloses a protection circuit, a protection control method of an electric drive system, the electric drive system and a vehicle. The protection circuit comprises a sampling module and a control module. The sampling module is used for obtaining multiple sampling signals of the electric drive system, and the control module is connected with the sampling module and used for executing protection measures on the electric drive system when at least two sampling signals in the multiple sampling signals of the electric drive system are abnormal. The protection circuit can collect various signals for comprehensive processing, all signal processing is carried out in the control module, an external signal processing circuit does not need to be added, the overall structure does not need to be optimized, whether the electric drive system is protected or not is comprehensively decided by considering various different types of sampling signals, the safety and reliability are improved, and the cost is reduced. And misjudgment caused by abnormal sampling or damage of the sampling module is avoided.

Disclosed is a power distribution device, a battery pack, and a vehicle, the power distribution device (1) including a base (100), a high voltage circuit (200), a circuit board (300), a low voltage circuit (400), and a plurality of high and low voltage connection tabs (500), a high voltage connection portion (110) and a low voltage connection portion (120) are fixed to the base, the high voltage circuit is at least partially assembled to the base and electrically communicates with the high voltage connection portion, includes a main cutoff switch core (230) having a module positive connection terminal (210) and a module negative connection terminal (220) and fixed by the base, the circuit board is attached to the base, the low voltage circuit is integrated on the circuit board and electrically communicates with the low voltage connection portion, and each of the high and low voltage connection tabs has one end connected to and electrically communicates with the high voltage circuit and the other end inserted into the circuit board and electrically communicates with the low voltage circuit. The power distribution device has the advantages of simple structure and compactness, high space utilization, small volume, light weight and low cost.

The present invention discloses a current sampling circuit, an overcurrent protection device, an intelligent power module and a household appliance. The current sampling circuit includes: a first detection unit, which is suitable for detecting a target current to generate a detection voltage; a mirror unit, which is suitable for mirroring the detection voltage to output a mirror voltage when the direction of the target current is a first direction; a second detection unit, which is suitable for generating a detection signal according to the detection voltage when the direction of the target current is a second direction, wherein the second direction is opposite to the first direction; and a sampling unit, which is configured to sample the target current according to the mirror voltage or the detection signal. The circuit is based on the mirror voltage obtained by mirroring the detection voltage and the detection signal generated according to the detection voltage, so that it can be applied to the sampling of positive and negative currents, expands the application range of the sampling circuit, and improves the sampling accuracy based on the mirror voltage.

A vehicle battery protection device for preserving the charge of the vehicle battery is electrically connectable between a vehicle battery and a vehicle electrical system. The device includes a solid-state switch commandable between an on state and an off state. A thermal safety algorithm executable by the device may include a switch derating process, a thermal analysis calibration, a vehicle profile function, and a data reconciliation function. The device employs hardware and software solutions to reduce the risk of thermal runaways and component failures in the device, while maximizing its useful operating envelope. The software solutions may include predicting future thermal loads for the device based on vehicle usage patterns specific to the vehicle within which the device is installed. Those predictions may be used to generate risk datasets which influence whether and to what extent thermal mitigation measures will be employed by the device at any point in time.

A ring main unit secondary control circuit integration device comprises a shell and a control module, wherein the control module comprises a control circuit, a power circuit with a +12V output meeting electromagnetic compatibility level 4, an input circuit, a control circuit, an open-in circuit, and an open-out circuit; the power circuit, the input circuit, the open-in circuit, and the open-out circuit are all electrically connected to the control circuit; the shell is a shell with a high protection level, the shell consists of a body and a cover plate covering the body and adopts a dustproof sealing structure, after the control module is fixed in the body, the electronic device glue completely seals the control module, and only the wiring terminals, LED lamps, and a debugging port are exposed in the body; the wiring terminals and the debugging port use waterproof sockets; after the cover plate is connected to the body, only the wiring terminals and the LED lamps are exposed, the debugging port is hidden under the cover plate, and is sealed by a rubber gasket.

A DC-DC conversion apparatus for a charging pile includes a group of power terminals, a plurality of groups of load terminals, and a plurality of isolated DC-DC conversion circuits. An input end of each isolated DC-DC conversion circuit is connected to the group of power terminals, and output ends of the plurality of isolated DC-DC conversion circuits are connected to the plurality of groups of load terminals in a one-to-one correspondence, so that the DC-DC conversion apparatus for a charging pile forms an architecture with a single input and a plurality of independent outputs. In this way, the DC-DC for a charging pile can have high power utilization while implementing wide-range power outputs.

The present application discloses an overcurrent protection circuit and an overcurrent protection method. The overcurrent protection circuit comprises an on-off module, a sampling module, and a control module; a first end of the on-off module is connected to a power supply, a second end of the on-off module is connected to a first end of the sampling module, and a control end of the on-off module is connected to an output end of the control module; a second end of the sampling module is connected to an electric device, a third end of the sampling module is connected to a first input end of the control module, and the sampling module is used for converting an output current of the power supply into a voltage; a second input end of the control module is connected to the power supply; and the control module is used for receiving the voltage value of the sampling module, and controlling the on-off module to be turned off when the voltage value is greater than or equal to a preset overcurrent threshold and the duration is greater than or equal to a turn-off threshold.

A system includes control circuitry configured to manage faults of an electrical system. The system is configured to monitor consumption for a plurality of electrical circuits, such as branch circuits, and generate device information about a device based on an electrical current measurement from at least one electrical circuit of the plurality of electrical circuits to which the device is coupled. The system is also configured to determining that an event has occurred based on the device information and interrupt current of the at least one electrical circuit, generate a notification, communicate a control signal to the device in response to the event occurring to mitigate the event, actuate a second device in response to the event, or a combination thereof.

The invention belongs to the technical field of on-satellite intelligent information processing power supply and distribution, and discloses a power supply and distribution system of an on-satellite real-time information processing system. The system is composed of a short circuit protection circuit (10), a surge suppression circuit (20), a satellite real-time processing system switching circuit (30) based on a magnetic latching relay, an EMI filter (40), a DC-DC power supply module (50), a relay-based power supply and distribution switching circuit (60), a DC-DC power supply module (70) and a DC-DC power supply module (80). According to the invention, the power supply problem of any dynamic redundancy unit in the satellite real-time information processing system is solved, and the sneak path problem caused by misoperation in the use process is avoided.

The invention relates to a hybrid commutation converter valve operation method and a hybrid commutation converter valve, and the method comprises the steps: obtaining a phase current measurement value of an AC wire inlet of the hybrid commutation converter valve, obtaining the bridge arm conduction state information of the hybrid commutation converter valve, and combining a preset corresponding relation among a bridge arm conduction state, a phase current and a bridge arm current, and obtaining a phase current measurement value of an AC wire inlet of the hybrid commutation converter valve; and analyzing and calculating to obtain the bridge arm current of the current conduction bridge arm. According to the scheme, the bridge arm current of the hybrid commutation converter valve is indirectly obtained by measuring the phase current measurement value of the alternating current wire inlet of the hybrid commutation converter valve and combining the bridge arm conduction state information for analysis, a current sensor does not need to be installed on the bridge arm of the hybrid commutation converter valve, the influence of electromagnetism and vibration is avoided, and the reliability of the hybrid commutation converter valve is improved. And the accuracy of the obtained bridge arm current is ensured. In this way, active turn-off monitoring of the hybrid commutation converter valve is achieved through the bridge arm current with high accuracy, and the operation reliability of the hybrid commutation converter valve is effectively improved.

The invention relates to the technical field of power distribution network protection and distributed power supply grid connection, in particular to a power distribution network protection fixed value setting method and system under a distributed power supply grid connection scene. The method comprises the steps of collecting and acquiring basic data, calculating short-circuit current according to a distributed power supply access condition and a topological structure of a power distribution network, determining a protection fixed value and verifying protection performance according to a short-circuit current calculation result and a protection fixed value setting principle, and ensuring correct action when a fault occurs; meanwhile, a protection fixed value is reasonably set, the characteristics of the distributed power supply are adapted, and the selectivity and sensitivity of a protection system are guaranteed; by configuring a reclosing function, the power supply reliability and the fault recovery capability are improved; meanwhile, automatic data collection and protection setting processes are utilized to adapt to different power distribution network topological structures, and stable operation of the power grid under various structures is ensured.

The invention relates to the field of motors, in particular to a self-adaptive overcurrent and intelligent protection motor system and method and a medium, and the method comprises the steps: detecting and obtaining motor current data in real time; determining an over-current signal through the motor current data and a preset over-current threshold value; determining and outputting a protection action signal according to the overcurrent signal and a preset trigger threshold value; determining a protection trigger signal according to the protection action signal, the motor current data and a preset protection threshold value; obtaining a recovery signal; and determining a recovery state signal through the protection trigger signal and the recovery signal and outputting the recovery state signal. The over-current protection device has the effect of enhancing the over-current protection effect of the motor.

The invention discloses a graph topology-based power distribution network protection parameter automatic checking method and system, and belongs to the technical field of power transmission and distribution. The method comprises the steps of obtaining a transformer substation outgoing line protection constant value, a terminal protection constant value, line zero-sequence current data, a topological relation below the transformer substation, line parameters and operation state data of lines, switches and distribution transformers; sVG analysis and power distribution network topological graph construction are carried out; subgraph extraction and hierarchy analysis; line parameter and protection constant value verification, including line parameter verification and protection constant value verification; the line parameter verification comprises branch line segment verification and switch position verification; the protection constant value verification comprises overcurrent I section verification, overcurrent II section verification and zero sequence protection verification. According to the method, automatic checking of the power distribution network protection parameters is realized, the checking efficiency and accuracy are greatly improved, and the method is suitable for a protection constant value checking scene of a complex power distribution network.

The invention provides a control method and system for an energy storage PCS with an AC / DC circuit breaker and a storage medium, and the method comprises the steps: firstly, synchronously collecting the electrical parameters of a DC side and an AC side, and carrying out the preprocessing of the collected data, so as to form a standardized electrical matrix; then, all parameters in the electrical matrix are cyclically compared with corresponding early warning thresholds, first-level thresholds, second-level thresholds and fusing thresholds in a multi-level threshold mapping table; if the pre-warning threshold value is exceeded, a log is recorded, if the pre-warning threshold value is exceeded, self-healing operation is executed, if the pre-warning threshold value is exceeded, turn-off operation is executed, and if the pre-warning threshold value is reached, physical fusing is triggered; meanwhile, all operation logs are recorded, and the threshold mapping table is dynamically optimized by analyzing log data; according to the method, the fault response speed and the protection precision are improved through multi-level threshold serial comparison and a cooperative protection mechanism, the stability and the reliability under different working conditions are enhanced through the adaptive learning capability, and meanwhile, the whole life cycle cost is reduced.

The invention discloses a portable spontaneous transcutaneous acupoint electrical stimulation device. The portable spontaneous transcutaneous acupoint electrical stimulation device comprises a wireless communication and control module; the wireless module is in wireless connection with an external control end to realize remote control and parameter setting; the electrical stimulation generation and output module is responsible for generating electrical stimulation information according to the received stimulation parameters and outputting the electrical stimulation information to human body acupuncture points through a plaster sheet or an ear clip; the physiological monitoring interface module is responsible for providing a connecting interface with other physiological monitoring devices; the stimulation parameter adjusting and feedback module is responsible for automatically adjusting stimulation parameters according to user settings and physiological monitoring data; the safety protection module is responsible for ensuring the safety of the equipment in the operation process; according to the invention, wireless connection is established between the wireless communication and control module and the external control end, so that remote control and parameter setting are realized, and a user can flexibly control the device through mobile equipment such as a mobile phone anytime and anywhere without being limited by a wire.