202 results about "Solid state circuit breaker" 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 relates to the technical field of circuit breakers, in particular to a semi-solid circuit breaker with an intelligent regulation and control function based on a photovoltaic system, which comprises a first acquisition module, a second acquisition module and a control module, the filtering window is used for acquiring to-be-filtered electrical data of the photovoltaic system and the to-be-filtered electrical data by using the semi-solid-state circuit breaker; the second acquisition module is used for acquiring filtering data of the to-be-filtered electrical data; and the regulation and control module is used for regulating and controlling the photovoltaic system according to the filtering data. And the filtering process of the electrical data of the photovoltaic system acquired by the semi-solid circuit breaker is optimized, so that the quality of the filtering data can be improved, and the effect of subsequently regulating and controlling the photovoltaic system based on the filtering data can be ensured.

A solid-state circuit breaker comprises a sensing and control circuit configured to realize designed functions, a power electronics section that includes solid-state switching components for normal operations and a vacuum gap section that includes a sealed vacuum tube. The vacuum gap section is disposed in series with the power electronics section. The vacuum gap section is configured to open to interrupt a current such that the associated arcs are contained in the sealed vacuum tube.

The invention discloses a direct-current solid-state circuit breaker with a voltage limiting protection circuit and a control method thereof. The direct-current solid-state circuit breaker comprises a solid-state switch module, the solid-state switch module comprises a first sub-module and a second sub-module which are the same, and each of the first sub-module and the second sub-module comprises a SiC JFET device J, capacitors C, Cgd and Cgs, a comparator U, an MOSFET device Q, a resistor Rg and resistors ra and rb; the first end of Rg is used for receiving a driving signal, and the second end of Rg is connected to the grid electrode of J after being connected with the first end of C, the second end of Cgd and the first end of Cgs; the second end of ra and the first end of rb are connected as a comparison voltage sampling point; the first end of ra is connected to the first end of Cgd and the drain electrode of J; the second end of the rb is connected to the second end of the Cgs, the source electrode of the Q and the source electrode of the J; the second end of C is connected to the drain electrode of Q; the output end of U is connected to the grid electrode of Q; the anode input of U is comparison voltage, and the cathode input is reference voltage; the source electrode of the first sub-module J is connected to the drain electrode of the second sub-module J.

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

A power semiconductor circuit is provided for clamping the voltage across the circuit during a fault. The circuit may include a power semiconductor switch, a clamping branch coupled in parallel with the power semiconductor switch, a snubber branch coupled in parallel with the power semiconductor switch and the clamping branch, and an isolation switch coupled in series with the power semiconductor switch. The clamping branch may include a first capacitor and a surge arrester coupled in parallel with a first resistor. The first capacitor may be coupled in series with the surge arrester and the first resistor. The snubber branch may include a second capacitor, a plurality of resistors, and a diode.

The invention provides a solid-state circuit breaker. The solid-state circuit breaker comprises a shell; the contact assembly is configured to be switched between an opening state and a closing state; a semiconductor element in series with the contact assembly; a handle configured to move between an opening position and a closing position; the first microswitch is fixed to the shell and can be triggered to generate a first signal; the second microswitch is fixed to the shell and can be triggered to generate a second signal; a first trigger portion coupled to the handle to move with movement of the handle; and a second trigger portion coupled to the handle to move with the movement of the handle. Wherein in the process that the handle moves from the closing position to the opening position, before the contact assembly is switched to the opening state, the first trigger part triggers the first microswitch to generate a first signal; and in the process that the handle moves from the opening position to the closing position, the second trigger part triggers the second microswitch to generate a second signal before the contact assembly is switched to the closing state.

The utility model relates to a solid-state circuit breaker with NTC temperature data acquisition, comprising a plurality of first NTC temperature data acquisition circuits, each of which is connected with an input end and an output end of a power supply terminal and is configured to acquire a first resistance value indicating temperature data of the power supply terminal; the plurality of second NTC temperature data acquisition circuits, each of the plurality of second NTC temperature data acquisition circuits is connected with two ends of the switch, and the plurality of second NTC temperature data acquisition circuits are configured to acquire a second resistance value indicating the temperature data of the switch; a voltage follower configured to output a voltage value corresponding to the second resistance value; a voltage / frequency (V / F) conversion circuit configured to output a voltage value subjected to amplitude-frequency conversion; an isolator configured to output a digitally isolated voltage value; and the MCU is connected to the first NTC temperature data acquisition circuit and the isolator, and executes on-off of the switch based on the first resistance value and the digitally isolated voltage value.

This invention discloses a wind-cooled multi-channel solid-state circuit breaker cabinet, comprising a cabinet body and a wind-cooling heat dissipation system. The cabinet interior is divided layer by layer from front to back by longitudinal beams into an isolation zone, a first component mounting zone, a heat dissipation zone, and a second component mounting zone. The wind-cooling heat dissipation system includes air inlets at the bottom of the front and rear doors and air outlets at the top, as well as a heat dissipation structure located within the heat dissipation zone. The heat dissipation structure includes a radiator duct and optional fan assemblies, which can be flexibly configured according to power switching components with different thermal powers to achieve precise and efficient heat dissipation. Each electrical channel has an independent control panel corresponding to the front door, integrating a display screen, indicator lights, and buttons, supporting independent on / off control of multiple circuits. This invention, through reasonable functional zoning and air duct design, solves the problems of low heat dissipation efficiency and poor multi-circuit adaptability in existing technologies, and has the advantages of high heat dissipation efficiency, reasonable layout, convenient operation and maintenance, and good protection.

A system includes any number of solid-state circuit breakers that couple between a power supply and an electrical load. The system also includes a housing and the solid-state circuit breakers are disposed within the housing. The housing includes a door sensor that generates a first signal indicative of a position of a door of the housing. The housing also includes an indicator that generates a second signal indicative of a position of a handle of the housing. The system also includes a secondary device communicatively coupled to the solid-state circuit breakers, the door sensor, and the indicator. The secondary device receives the first signal and the second signal and generates an instruction to adjust an operating state of the solid-state circuit breakers based on the first signal and the second signal.

The utility model relates to a solid-state circuit breaker which is characterized by comprising a current detection circuit which is configured to detect a current signal in the circuit and output a detection signal; and the current limiting circuit is connected to the current detection circuit and is configured to generate a first control signal for controlling the turn-off of the solid-state circuit breaker according to the detection signal so as to limit the current in the circuit. The current limiting circuit is configured to trip instantly after the current in the line exceeds a set threshold value, so that the damage of excessive short-circuit current to a solid-state device, namely an MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) can be avoided, and meanwhile, a cable can also be protected. And the MCU microprocessor is configured to process and analyze the detection signal representing the current in the circuit, and give a tripping command to break the circuit when a tripping condition is met.

A direct current (DC) solid state circuit breaker includes a first terminal, a second terminal, a power electronics section comprising at least a first transistor switch, and one or more airgap sections that include at least a second transistor switch and a third transistor switch. The second transistor switch and the third transistor switch arranged in back to back configuration such that i) the second transistor switch is configured to interrupt current flowing in a first direction from the first terminal to the second terminal and ii) the third transistor is configured to interrupt current flowing in a second direction from the second terminal to the first side terminal. The DC solid state circuit breaker also includes a controller configured to detect a fault condition and control operation of the power electronics section and the one or more airgap sections in response to detecting the fault condition.

According to the short-circuit protection method and system based on the low-voltage alternating-current solid-state circuit breaker, whether the current rise rate exceeds a given threshold value or not is detected, and the short-circuit fault can be quickly removed while the circuit breaker effectively avoids surge current by utilizing the microsecond-level short-circuit fault cutting-off capability of the solid-state circuit breaker, so that the short-circuit protection effect is improved. The function of rapidly and accurately removing the short-circuit fault of the ship power system is achieved. According to the method, the current rise rate is detected while the current is detected, so that the surge current and the short-circuit current are distinguished, short-circuit protection is prevented from being started by mistake, and the problem that a solid-state circuit breaker in a ship low-voltage alternating-current power system recognizes the surge current as a short-circuit fault, and consequently misoperation is caused is effectively solved. The method can give full play to the microsecond-level short-circuit fault removal capability of the solid-state circuit breaker, and facilitates the selective protection design of multistage nodes of a power distribution system.

The invention provides a semiconductor package and a solid state circuit breaker including the same. A semiconductor package may include: a package substrate provided with a plurality of pins connected to the outside, the plurality of pins including a drain pin, a source pin, a Kelvin pin, and a gate pin; a first die; a second die spaced apart from the first die in the first direction; and a multilayer conductive connection structure on the package substrate and including a first conductive pattern and a second conductive pattern over and partially overlapping the first conductive pattern, in which the first die and the second die are connected in parallel, the gate electrodes of the first die and the second die are electrically connected to the gate pin via one of the first conductive pattern and the second conductive pattern, the Kelvin electrode of the first die is electrically connected to the Kelvin pin, and the Kelvin electrode of the second die is electrically connected to the Kelvin pin via the other of the first conductive pattern and the second conductive pattern.

The application provides a method and device for improving the rated current breaking times of a direct-current solid-state circuit breaker and application thereof, and aims at the problem that the performance of an existing direct-current solid-state circuit breaker is degraded after multiple current impacts on a voltage-dependent resistor, the junction temperature of a power device is difficult to measure, and the breaking times are limited due to over-temperature damage, the application comprises a junction temperature prediction module based on a physical information neural network, an auxiliary energy absorption module and a power device voltage clamping module. The junction temperature prediction module accurately predicts the junction temperature of the power device in real time by fusing a physical thermal model and a neural network. The voltage clamping module suppresses the turn-off overvoltage. The auxiliary energy absorption module is started when the junction temperature is close to the limit, and absorbs the remaining energy. The design reasonably allocates the turn-off energy, reduces the impact times and intensity of the voltage-dependent resistor, significantly improves the service life (such as about 10 times under the impact of 200 A), and further greatly improves the rated breaking times of the solid-state circuit breaker, and is low in cost, high in reliability, and suitable for scenes such as a direct-current power grid.

The invention discloses a fault isolation and self-healing control method for a multi-terminal flexible direct current power supply system in the field of flexible direct current power supply, and aims to solve the technical problems that a traditional multi-terminal flexible direct current system is lagged in fault positioning, low in isolation speed, not timely in self-healing response and low in power supply recovery precision. According to the method, through a closed-loop control logic of fault feature extraction, accurate positioning, rapid isolation and dynamic self-healing, a fault identification model is constructed based on collaborative features of transient current and voltage, and millisecond-level positioning of a fault section is realized in combination with a simplified fault positioning formula; an IGBT series solid-state circuit breaker is adopted to realize rapid fault isolation, a self-healing scheduling strategy of load priority and resource adaptability is introduced, and power supply is recovered through cooperative scheduling of a distributed power supply and an energy storage unit. The fault isolation time is shortened, the power supply recovery success rate is improved, the voltage recovery deviation is reduced, and the power supply reliability and the operation toughness of the multi-terminal flexible direct current power supply system are remarkably improved.

The invention discloses an I-type modularized direct-current solid-state circuit breaker, which relates to the technical field of direct-current solid-state circuit breakers and comprises four horizontal bridge arms, namely an FBSM1, an FBSM2, an FBSM3 and an FBSM4, a vertical bridge arm group, and four inductors, namely an L1, an L2, an L3 and an L4. According to the circuit breaker, the removal time of monopole grounding and interelectrode short circuit faults is short and far faster than that of a traditional circuit breaker, and the impact of fault current on equipment can be greatly reduced. Differentiation module control is adopted for different faults, power supply of the other pole is not affected when the faults are removed, and the system reliability is improved. When inter-electrode short circuit occurs, forward voltage is inserted into the full-bridge sub-module to enable the voltage of a short-circuit point to be close to zero, reverse discharge of a capacitor is limited, fault current is cleared at the first zero crossing point of current, fault expansion is avoided, and the problems that an existing traditional solid-state circuit breaker is insufficient in single-pole grounding fault processing capacity, influences system power supply reliability, is single in function and the like are solved.

A solid state circuit breaker module (17) for integration into a power converter, the circuit breaker module (17) having a housing (19) containing: a. A semiconductor switch (7) acting as a main overcurrent protection means; b. An electromechanical protection relay (9) serving as a fallback over-current protection device; c. A fuse (35) serving as a final overcurrent protection device; d, a current sensor used for detecting overcurrent; e. A controller for tripping the semiconductor switch (7) and the protective relay (9) when the current sensor detects an overcurrent; and f. A sealed gas chamber (29) filled with an arc extinguishing gas, the gas chamber (29) housing the semiconductor switch (7), the protective relay (9) and the fuse (35).

Solid-state circuit breakers (SSCBs) have been witnessing an impressive progress with the aid of wide bandgap (WBG) devices such as silicon carbide (SiC) MOSFETs. Along with obtaining high efficiency as the result of low on-state resistance, response times have been gaining remarkable achievements in microseconds range. Not only that, the reported successes in control and gate drivers design and incorporating fault detection / location techniques in SSCBs are promising. A MOV-resistive capacitive switch (MOV-RCS) snubber for solid state circuit breakers addresses the following: 1) the MOV degradation issue in DCCBs is solved, 2) the maximum allowable DC bus voltage on DCCBs is extended. The solid state circuit breaker and an active clamping snubber includes a first circuit including a fault current bypass based solid state breaker for low voltage direct current systems.

The application discloses a plug-in modular solid-state circuit breaker, and belongs to the technical field of circuit breakers, which comprises a main loop circuit board, a main loop circuit board mounting seat, an insulating surface cover, a control loop circuit board, a control loop circuit board mounting seat, a plurality of conductive columns, a shunt and an insulating mounting base; wherein the main loop circuit board is arranged in the mounting cavity of the main loop circuit board mounting seat; the insulating surface cover is arranged in the mounting cavity of the main loop circuit board mounting seat, thereby forming a first module; one end of the plurality of conductive columns is electrically connected with the wiring terminal of the insulating mounting base; the shunt is welded with one of the conductive columns; the control loop circuit board is fixedly arranged in the mounting cavity of the control loop circuit board mounting seat, and is integrally fixed to the insulating mounting base, thereby forming a second module; and the first module is inserted into the second module. The plug-in modular solid-state circuit breaker solves the inconvenient maintenance and assembly problem of the traditional solid-state circuit breaker caused by the fact that the traditional solid-state circuit breaker is designed as an integral structure which is difficult to disassemble and assemble.

Disclosed herein are aspects for detecting and responding to over-current conditions in a solid-state circuit breaker (SSCB) system. An example aspect for a solid-state circuit breaker system includes a shunt resistor (205) to generate a voltage proportional to a current flowing through a circuit, a plurality of fault detection units (203), an OR gate (206) to receive timer output signals from the plurality of fault detection units (203) and generate a fault detection signal, and an SR latch (207) having a set input to receive the fault detection signal from the OR gate (206), the SR latch (207) configured to provide a control signal to a gate driver of a solid-state switch based on the fault detection signal. Each fault detection unit can include a digital-to analog (DAC) converter to set a threshold voltage, a comparator (204) to compare voltages, and a timer to validate a fault condition and generate the timer output signals.

The application discloses a kind of modular parallel solid-state circuit breaker current sharing control device and method, multiple solid-state circuit breakers are parallel, and current balance between solid-state circuit breaker is realized based on current sharing control technology.The current of n solid-state circuit breakers is detected in real time, the actual current of the first n-1 solid-state circuit breakers is closed-loop regulated using closed-loop control technology, corresponding drive control signal correction is generated, and then the equivalent on-resistance of solid-state circuit breaker is adjusted by drive control signal, so that the actual current of n-1 solid-state circuit breakers is equal to average current.The drive control signal correction of the first n-1 solid-state circuit breakers is summed and inverted, and used as the drive control signal correction of the nth solid-state circuit breaker, so that the overall average equivalent resistance remains unchanged.The application realizes the modular combination of solid-state circuit breaker, and only one specification of solid-state circuit breaker can meet the needs of circuit breaker of different current levels, with great application prospect.

This invention relates to a marine medium-voltage DC power distribution device based on a water-cooled solid-state circuit breaker. The top of the cabinet is equipped with pressure relief plates for arc relief channels in the circuit breaker compartment, busbar compartment, and cable compartment. The circuit breaker compartment houses a power electronic switch valve string unit; the diode valve string compartment and IGBT valve string compartment in the power electronic switch valve string unit are connected. The instrument compartment in the upper part of the cabinet houses secondary terminal blocks, circuit breakers, controllers, relays, integrated relay protection devices, fiber optic current transformer junction boxes, electromagnetic locks, and voltage transformers in the cable compartment. The cable compartment includes external copper busbars, current transformers, and voltage transformers. A live display device, voltage transformers, and current transformers are mounted on the busbars. The busbar compartment houses the main busbar and branch busbars. The main busbar connects each functional panel, and each functional panel uses a separate bus tie panel. This design reduces the space volume of the ship's main switchboard while fulfilling the measurement and protection functions of the medium-voltage DC power distribution device's bus tie panel.

The application discloses a kind of fast response solid-state circuit breaker, including semiconductor two-terminal device, thyristor and two-terminal element;The electrode T of semiconductor two-terminal device is connected with the cathode K1 of thyristor, the electrode S of semiconductor two-terminal device is connected with the second end L of two-terminal element, the first end H of two-terminal element is connected with the gate G of thyristor, solid-state circuit breaker is two-terminal component, the anode A of thyristor is as the first electrode of solid-state circuit breaker, the electrode S of semiconductor two-terminal device is as the second electrode K of solid-state circuit breaker;Semiconductor two-terminal device is the semiconductor two-terminal device with current transient suppression function, two-terminal element is the component with shutdown function.The solid-state circuit breaker of the application is a two-terminal component, does not need additional drive control, and has the function of self-detecting abnormal overcurrent, and can be fast response, can be independently cut off abnormal current in μs level.

The present disclosure relates to a solid state circuit breaker, comprising: a semiconductor switch unit including a semiconductor switch that electrically connects or disconnects a power system and a load according to a voltage applied to a gate terminal; and a control unit that, when the semiconductor circuit breaker is turned on, controls the semiconductor switch to repeat turn-on and turn-off operations for a predetermined initial driving time so as to gradually alleviate the magnitude of inrush current caused by an initial connection between the power system and the load.

The invention relates to a solid state circuit breaker comprising an electronic switch, a mechanical switch configured to complete a closing process and an opening process by manual operation, a sensor configured to generate a trigger signal depending on a position of the mechanical switch during the closing process or the opening process, a control unit configured to activate an assistance mechanism depending on the trigger signal, and the assistance mechanism configured for providing assistance for the closing process or the opening process, wherein the electronic switch is connected in series with the mechanical switch.

A Solid-State Circuit Breaker Device and Method Without Current Limiting Inductor. According to an exemplary embodiment of this disclosure, described is a high-density, high-efficiency megawatt (MW) medium-voltage (MV) solid-state circuit breaker (SSCB) for, example only, aviation hybrid electric propulsion applications. The SSCB is based on the mature silicon (Si) insulated gate bipolar transistor (IGBT) devices. With reduced IGBT gate voltage, the disclosed SSCB can limit the peak fault current without the fault current limiting inductor. Thus, the specific power density of the SSCB is substantially improved compared with the traditional design.

According to an embodiment of the present disclosure, there is provided a solid-state circuit breaker and its self-test method. The solid-state circuit breaker comprises an input end and an output end, the input end being adapted to be connected to a mechanical switch; a first switching device connected between the input end and a first node; a second switching device connected between the first node and the output end; a third switching device and a first resistive element connected in series between the input end and the output end; an auxiliary power branch connected between the first node and a second node; an anti-reverse connection circuit connected between the second node and the input end and between the second node and the output end, and configured to allow a current to flow unidirectionally from the second node to the input end and the output end; a first current sensor configured to sense a current flowing through the second switching device and generate a first current signal; a second current sensor configured to sense a current flowing through the auxiliary power branch and generate a second current signal; and a control unit configured to determine operation states of the first switching device and the second switching device based on the first current signal and the second current signal.

A device includes an electro-mechanical switching device having an open-circuit and closed-circuit conditions and a path of least resistance having a path input and a path output with the switching device between the input and the output. The device includes a bypass power switch device that comprises a solid-state circuit interrupter and that is configured to conduct current between the input and the output in response to an open-circuit condition of the switching device. The device includes a current sensor that is connected to the output and configured to detect a fault current event. The device includes an actuator that is coupled to the switching device and a controller that is configured to generate a trigger signal to activate the actuator to cause the open-circuit condition of the switching device and to interrupt the fault current event by the power switch device, based on the detected fault current event.

A solid-state circuit breaker or a residential circuit breaker includes a base housing semiconductors, electronics and advanced software algorithms. The base has a first profile area. It further includes a ventilation system for cooling the solid-state circuit breaker. The ventilation system includes a main cover configured to be mounted on the base by covering the first profile area of the base. The main cover has a second profile area such that the second profile area has an array of holes built-in the main cover. The ventilation system further includes an outer cover configured to be mounted on the main cover by covering the second profile area of the main cover to form an assembly of multi-layered covers. The outer cover has a third profile area such that the third profile area has an array of ribs built-in the outer cover.