254 results about "Solid state circuit breaker" patented technology

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.

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 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 provides a current-limiting protection circuit of a direct-current solid-state circuit breaker and a control method of the current-limiting protection circuit. The current-limiting protection circuit comprises a first current-limiting circuit, a second current-limiting circuit, a third current-limiting circuit, a first driving resistor, a second driving resistor, a first power switch, a second power switch, a third power switch, a first sampling module, a second sampling module and a third sampling module, the first current limiting circuit is used for comparing the sampling voltage output by the first sampling module with the reference voltage and reducing the current turn-off speed of the first power switch according to the comparison result; the second current limiting module is used for comparing the sampling voltage output by the second sampling module with the reference voltage and slowing down the current turn-off speed of a branch where the second power switch is located according to the comparison result; and the third current limiting circuit is used for comparing the sampling voltage output by the third sampling module with the reference voltage, and slowing down the current turn-off speed of the branch where the third power switch is located according to the comparison result. And the current overshoot degree of the parallel switching device can be greatly reduced.

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.

The solid-state circuit breaker comprises a first switch, a second switch, a first capacitor and a first diode, the first end of the first switch is connected to the positive electrode of an input end, the second end of the first switch is connected to the first end of the second switch, the second end of the second switch is connected to the positive electrode of an output end, and the first capacitor is connected to the first diode. The first end of the first capacitor is connected with the first end of the second switch, the second end of the first capacitor is connected to the negative electrode of the input end, the cathode of the first diode is connected with the second end of the second switch, and the anode of the first diode is connected with the negative electrode of the output end.

The present disclosure discloses a solid-state circuit breaker, including an electronic switch and a mechanical switch connected in series, the mechanical switch includes: a housing; a handle, rotatably installed to the housing and capable of stopping at an on position, an charged position, and an off position between the on position and the charged position; a movable contact and a stationary contact; and a transmission assembly, configured to transmit a motion of the handle to the movable contact to achieve contact and separation with the stationary contact; upon the handle being in the on position, the mechanical switch is on; upon the handle being in the off position, the mechanical switch is off, and the transmission assembly is in a tripping state; upon the handle being in the charged position, the mechanical switch is off, and the transmission assembly is in a non-tripping state.

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.

The present disclosure discloses a solid-state circuit breaker, a mechanical breakpoint of the solid-state circuit breaker adopts a modular layout, which includes: a housing module; a breaking unit module including a stationary contact and a movable contact; a mechanism module configured to drive an action of the breaking unit module; and a transmission module, configured to connect the mechanism module and the breaking unit module, wherein the housing module, the mechanism module, the breaking unit module and the transmission module are independent from each other and are able to be installed and disassembled from each other. The solid-state circuit breaker according to the present disclosure is modularized, the installation process is simple, the switching of different application requirements is facilitated, and the maintenance and replacement of internal components are more convenient.

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 belongs to the technical field of power electronics and electricians, and provides an online real-time junction temperature detection method for a semiconductor power device, which is used for detecting junction temperature data of the power device under steady-state and transient-state conditions. The method comprises the following steps: step 1, detecting a main loop current value flowing through a semiconductor power device in a solid-state circuit breaker / solid-state power controller, an input voltage in a power distribution loop, an output voltage in the power distribution loop, a bus voltage and a device surface temperature in real time; 2, in the closing process of the solid-state circuit breaker, discretizing the collected input voltage in the power distribution loop, the output voltage in the power distribution loop and the main loop current value, inputting the discretized input voltage, output voltage and main loop current value to a processor to calculate discretized real-time power consumption, and inputting the real-time power consumption and the device surface temperature to a thermal network model; and finally calculating the junction temperature of the semiconductor device in the closing process. And step 3, in the breaking process of the solid-state circuit breaker, discretizing the current value of the main loop and the bus voltage, inputting the discretized current value and bus voltage into a processor to calculate discretized real-time power consumption, inputting the real-time power consumption and the surface temperature of the device into the thermal network model, and finally calculating the junction temperature of the semiconductor device in the breaking process. The method is suitable for online real-time junction temperature detection of the power device.

The invention provides a direct-current solid-state circuit breaker, and the circuit breaker comprises a consumption module which is used for dissipating the current energy of the direct-current solid-state circuit breaker; the switch module is connected in series with the consumption module and is used for breaking the fault current of the direct-current solid-state circuit breaker; and the voltage limiting module is connected in parallel with the switch module and used for limiting the voltage of the direct-current solid-state circuit breaker. The consumption module is arranged in the direct-current solid-state circuit breaker, so that the current dissipation energy of the direct-current solid-state circuit breaker is mainly dissipated through the consumption module, the difficulty of model selection of energy dissipation devices of the consumption module is reduced, the practicability of the direct-current solid-state circuit breaker is improved, and the cost is saved. The problem of difficulty in model selection of the energy-consuming device of the direct-current solid-state circuit breaker in the prior art is solved.

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.

A power protection system includes a first DC power source, a first load, a first power bus connecting the first power source and the first load, and a first solid state circuit breaker circuit integrated in the first power bus. The first solid state circuit breaker circuit includes a first semiconductor switch, a first capacitor arranged between the high side voltage rail and the low side voltage rail closer to the power source or to the load than the semiconductor switch, and a first inductor located such that current generated by the first capacitor when unloading in case of a short circuit at the power source or at the load passes the first inductor. The controller is configured to measure a voltage change over the first inductor and trigger an actuation signal for the first semiconductor switch if a voltage change surpasses a predetermined threshold voltage.

The present disclosure discloses a solid-state circuit breaker, which includes an electronic switch and a mechanical switch connected in series, the mechanical switch comprises: a housing; a handle (2), rotatably installed to the housing and capable of stopping at an on position, an charged position, and an off position between the on position and the charged position; a movable contact (4) and a stationary contact (3), wherein the movable contact is configured to be movable between an open position and a closed position, in the open position, the movable contact is not in contact with the stationary contact, in the closed position, the movable contact is in contact with the stationary contact; and a transmission assembly (5), configured to transmit a motion of the handle to the movable contact to achieve contact and separation with the stationary contact; upon the handle being in the on position, the mechanical switch is on; upon the handle being in the off position, the mechanical switch is off, and the transmission assembly is in a tripping state; upon the handle being in the charged position, the mechanical switch is off, and the transmission assembly is in a non-tripping state.

A solid-state circuit breaker includes an airgap operating mechanism including components and electronics including semiconductors and software algorithms that control the power and can interrupt extreme currents. The SSCB further includes a housing that houses the components of the airgap operating mechanism and the electronics. The housing of the solid-state circuit breaker includes a heat sink that is part of an outer molded case such that a plastic part of the heat sink is over-molded onto a heat conducting piece that is directly connected to the semiconductors of the solid-state circuit breaker. The plastic part and the heat conducting piece are to be separated into two or more parts if the semiconductors are located at different locations on a printed circuit board such that a thermal bridge to conduct heat between the two or more parts and eventually to a plurality of fins external to the solid-state circuit breaker.

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.

According to the embodiment of the invention, a solid-state circuit breaker and a self-checking method thereof are provided. The solid-state circuit breaker comprises an input end and an output end, and the input end is suitable for being connected to the mechanical switch; a first switching device connected between the input terminal and the first node; a second switching device connected between the first node and the output terminal; a third switching device and a first resistive element connected in series between the input terminal and the output terminal; the auxiliary power supply branch is connected between the first node and the second node; the anti-reverse-connection circuit is connected between the second node and the input end and between the second node and the output end, and allows current to flow from the second node to the input end and the output end in a one-way mode; a first current sensor sensing a current flowing through the second switching device and generating a first current signal; a second current sensor sensing a current flowing through the auxiliary power supply branch and generating a second current signal; and the control unit determines the working states of the first switching device and the second switching device based on the first current signal and the second current signal.

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 present disclosure relates to an electromechanical sequential action device that is capable of sequentially interlocking a mechanical switch and a power electronic switch, where through an action sequence control, the electromechanical mechanism turns on the power electronic switch only after the mechanical switch is closed, and through an advanced travel control, turns off the power electronic switch before opening the mechanical switch, avoiding the problem of arc discharge during closing and opening of the mechanical switch, and improving the service life and connection reliability of the mechanical switch.

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.