496 results about "Inrush current" patented technology

According to the heterogeneous multi-core chip power consumption state control system and the heterogeneous multi-core chip provided by the invention, the power consumption state request of each sub power supply domain is received through the set system hardware power consumption management module, and the driving signal is sent to the corresponding sub power supply domain according to the preset hardware time sequence, so that the corresponding sub power supply domain enters the target state; generating a PMU control signal; and the power management module drives an internal voltage regulator to execute corresponding regulation operation according to the PMU control signal. A special control processor (SCP) is not needed, the system hardware power consumption management module realized by pure hardware is adopted to directly control the power consumption state of each sub power supply domain in the heterogeneous multi-core SoC, the software processing delay is eliminated, the response speed is high, the static power consumption of the power consumption management module is remarkably reduced, and the system is particularly suitable for an ultra-low power consumption scene and has a wide application prospect. And hardware-level surge current protection is realized in a multi-core power-on process.

A system for providing inrush current limiting for induction motor starting. The system utilizes a pre-start controller to initialize operation of a controller including multiple switches for controlling the voltage delivered to a motor having multiple phases. The pre-start controller activates each switch and determines whether a phase current flowing through the switches satisfies a threshold current. The switches are deactivated a phase current satisfies the threshold current. The pre-start controller determines an activation order for each phase and orders phases having higher phase currents higher in the order than lower phase currents, and determines an activation timing. Based on whether the highest phase current is positive or negative, the pre-start controller then activates, using a voltage at a corresponding angle and based on the activation order and activation timing, the phases to de-saturate the flux generated by the phase currents, thereby limiting an inrush current provided to the motor.

The utility model discloses a soft start system based on excitation current reduction, which is characterized in that a time relay mainly controls the switching of a live wire between a power resistor and an alternating current contactor, the power resistor magnetizes a transformer at the moment of electrification, and the alternating current contactor is connected into a circuit by the time relay after the magnetization is completed; and after the power resistor is short-circuited, the circuit is cut out, so that the purpose of suppressing the excitation inrush current is finally achieved, the excitation effect caused by voltage abrupt change at the power-on moment of the isolation transformer can be avoided, and the excitation abrupt change of the isolation transformer during power-on is effectively reduced.

The invention discloses a pre-synchronization control method for a network-building converter based on a virtual synchronous generator, and the method comprises the steps: collecting the three-phase voltage of the output end of the virtual synchronous generator VSG and the three-phase voltage of a power grid side, converting the three-phase voltage into a voltage component in a two-phase static coordinate system through Clark conversion, and extracting a positive-sequence component; calculating a phase difference compensation coefficient based on the positive sequence component; based on the phase difference compensation coefficient, adaptively setting a PI parameter; and calculating and adjusting the amplitude of the internal potential to finish pre-synchronization. In the working process, through self-adaptive PI parameter setting and amplitude accurate judgment, the pre-synchronization time is shortened, the grid-connected impact current is reduced, and the grid-connected success rate of the micro-grid in a weak grid scene is improved.

A battery pack charger may include a housing. The battery pack charger may include a battery pack interface provided on the housing and configured to removably receive a battery pack. The battery pack charger may include a power input. The battery pack charger may include an LLC converter including a dual transformer electrically connected between the power input and the battery pack interface. The battery pack charger may include a power factor correction (PFC) boost converter electrically connected between the power input and the battery pack interface. The battery pack charger may include an input inrush current control circuit electrically connected between the PFC boost converter and the battery pack interface.

The invention discloses a high-side driving circuit and a vehicle body controller. The high-side driving circuit relates to the field of vehicle body controllers, and solves the problem that the existing high-side driving circuit cannot meet the requirements of low cost and high reliability. The switching circuit adopts a combined structure of switching tubes and is connected in series between a power supply and a load, and more stable on-off control is realized through cooperation of multiple tubes; the starting threshold circuit responds to an external control signal only when the load impedance meets a preset threshold value, and large-current load driving in the starting stage or forced starting during load abnormity is carried out. The over-current threshold circuit is connected in series with a driving loop of the switching circuit and provides constant over-current turn-off. A voltage negative feedback circuit is introduced into the voltage and potential stabilizing module to realize self-turn-off and keep a turn-off state when overcurrent and short circuit occur, and self-recovery is realized after a fault disappears without depending on logic judgment of an external control unit. The port protection module absorbs the instantaneous high voltage and the surge current. Through the characteristics, the current-carrying capability of the triode is improved, and the application range of the triode switching circuit is widened.

The invention relates to a relay phase selection pull-in control method. The method comprises the following steps: acquiring a first phase voltage zero crossing point, a second phase voltage zero crossing point and a third phase voltage zero crossing point; speculating pull-in voltage zero crossing points of the first soft start relay and the second soft start relay based on the third phase voltage zero crossing point, and speculating pull-in time delay of the first soft start relay and the second soft start relay based on the pull-in voltage zero crossing points; speculating a first pre-charging zero crossing point based on the first phase voltage zero crossing point, and speculating the pull-in time delay of the first main power relay based on the first pre-charging zero crossing point; and a second pre-charge zero crossing point is speculated based on the second phase voltage zero crossing point, and the pull-in time delay of the second main power relay is speculated based on the second pre-charge zero crossing point. Inrush current can be suppressed, loss is reduced, and the service life of the relay is prolonged.

The invention relates to the technical field of power supply or power distribution circuit devices of power systems, and discloses a power distribution loop self-reset state control system based on thermal parameter feedback, which comprises a thermal parameter acquisition module used for acquiring a physical heat dissipation temperature sequence of a power supply node after tripping; the historical load mapping module is used for calculating a closing transient temperature rise estimated value according to the load characteristic data within 24 hours before tripping and generating a dynamic correction value of a heat dissipation slope judgment boundary; the logic arbitration module is used for calculating the deviation degree of the heat dissipation slope of the double-window sampling sequence and judging whether the deviation degree is converged into a heat dissipation slope judgment boundary updated according to the dynamic correction amount or not; according to the invention, through a closed loop arbitration mechanism of a heat dissipation characteristic slope, a physical heat dissipation steady state inflection point is identified, a maloperation risk caused by environment thermal resistance drift and closing inrush current impact is eliminated, and power supply continuity is guaranteed.

The invention provides a high-power power supply AC-DC switch surge current suppression method and system and related equipment, and relates to the technical field of switching power supplies, and the method comprises the steps: carrying out the parameter initialization after a power supply system is powered on, obtaining a surge current suppression parameter, and starting an nth AC-DC power module in N AC-DC power modules; the method comprises the following steps: monitoring total input current on an alternating current input bus of a power supply system in real time, and circularly executing the following operations until N AC-DC power modules are all started: determining whether the nth AC-DC power module enters a steady-state operation state or not; when it is determined that the nth AC-DC power module enters the steady-state operation state, and n is smaller than N, whether the n AC-DC power modules enter the steady-state operation state or not is determined; and under the condition that it is determined that all the n AC-DC power modules enter the steady-state operation state, performing cooperative suppression operation on the (n + 1) th AC-DC power module in the N AC-DC power modules according to the surge current suppression parameters so as to start the (n + 1) th AC-DC power module.

The invention relates to the technical field of relay protection, in particular to a method for identifying excitation surge current of a transformer sent out by a wind power plant based on differential current waveform characteristics and application of the method. Compared with a traditional second harmonic braking method, the method has the advantages that the time window is short, the magnetizing inrush current of the transformer can be quickly identified, and the protection reliability of the sending-out transformer of the wind power plant is improved. The objective of the invention is to solve the problem of how to reliably identify the magnetizing inrush current fault of the wind power plant transformer.

The invention relates to the technical field of digital ring main unit power distribution operation regulation and control, and discloses an intelligent power distribution operation regulation and control system of a digital ring main unit, which comprises a state sensing module, a logic judgment unit and an execution regulation and control module, the logic discrimination unit identifies a feeder power distribution state according to the power flow distribution data and generates a topology reconstruction scheme; the execution regulation and control module drives a switch to act, migrates the feeder loop to a target bus section, forms transition impedance by using closing pre-breakdown current during migration, inhibits transient inrush current, drives an impedance compensation branch to access according to a zero-sequence current vector of the feeder loop, and counteracts neutral point potential drift by using potential bias generated by reactive power injection; according to the method, the power distribution topology is converted from static hard connection to logic remapping, circuit transient state physical process reconstruction and stock hardware redundancy mining are utilized, node power vector balanced distribution is achieved under the condition that the feeder line continuous power receiving state is maintained, and power flow randomness conflicts are eliminated.

The invention discloses a circuit for a high-voltage direct-hanging electric heater, and the circuit comprises a high-voltage pre-charging module which is used for inputting high-voltage alternating current and suppressing the surge current of the high-voltage alternating current; the full-bridge rectifier module is used for converting the high-voltage alternating current into direct current; the conversion and control module is used for isolating and converting the direct current and outputting rated voltage and required power of the electric heater based on the direct current, the full-bridge rectifier module is connected with the high-voltage pre-charging module and the conversion and control module, and the output end of the conversion and control module is connected with the electric heater.

The invention belongs to the technical field of power semiconductor devices. The invention provides a SiC MOSFET surge current transient electrothermal coupling failure modeling method. A real packaging three-dimensional structure model is established, and material parameters are defined; dividing grids, constructing a current and solid heat transfer module, applying surge waveform data and realizing real-time coupling; carrying out transient solution to obtain temperature data, extracting a hot spot area and comparing thermodynamic critical parameters of the material; and establishing a multi-class failure mechanism model, and outputting a failure prediction result and reliability evaluation. The method is high in structural reduction degree, transient temperature rise and hot spot distribution can be accurately simulated, the problems that modeling is not accurate, transient electrothermal coupling analysis is lacked and a real failure mode cannot be reflected in the prior art are solved, the failure position, mode and threshold value can be accurately predicted, the method is suitable for reliability evaluation under the multi-surge condition, and the method is suitable for popularization and application. And the method has engineering application value and research significance.

Method and process of fault detection in power systems using feature extraction from the measurements of the voltages and currents in the power system, as well as machine learning methods. A computer processor, such as an industrial computer, is connected to various voltage and current measurement systems in various locations. This, in turn, is connected to a server computer and control system. Electrical power fault signals (features) propagating through the power system network are analyzed using various measurements and feature extraction methods. These can be used to detect, classify, and localize the fault. The present methods are particularly useful for hard-to-analyze faults such as high impedance faults and faults occurring due to inrush currents, bidirectional power flows, and islanding issues.

A charge pump control circuit, comprising an internal reference voltage generator configured to generate a programmable reference voltage ramp, and a control circuit coupled to the internal reference voltage generator. The control circuit configured to control current of a charge pump circuit driving a load by controlling a duty cycle of a transfer phase of the charge pump circuit during a gain-up stage according to a first comparison between the programmable reference voltage ramp and an output voltage across an output capacitor of the charge pump circuit, and a second comparison between a fly capacitor reference voltage and a fly capacitor voltage of a fly capacitor of the charge pump circuit.

The invention provides a multi-stage soft start charging circuit and device for a high-capacity capacitor and electronic equipment. The circuit comprises a multi-stage timing sub-circuit, a multi-stage soft start circuit and the high-capacity capacitor, the multi-stage timing sub-circuit comprises n timing sub-circuits which are connected in parallel; the multi-stage soft driver circuit comprises n soft driver circuits which are connected in series; a first port of the ith timing sub-circuit is connected with a positive electrode of a power supply, a second port of the ith timing sub-circuit is connected with a ground wire, and a third port of the ith timing sub-circuit is connected with a first port of the ith soft driver circuit; one end of the high-capacity capacitor is connected with the positive electrode of the power supply, the other end of the high-capacity capacitor is connected with the second port of the nth soft driver circuit, the third port of the jth soft driver circuit is connected with the second port of the (j-1) th soft driver circuit, and the third port of the first soft driver circuit is connected with a ground wire. The circuit provided by the invention can be used for quickly charging the high-capacity capacitor on the premise of limiting the impact current and not losing the energy storage and filtering effects of the capacitor.

The invention provides a power control method and a power control system based on phase dislocation control. The power control method comprises the following steps: acquiring a real-time heating state and an expected heating state of a household appliance; if the real-time heating state does not reach the expected heating state, determining the heating power required by the household appliance; if the heating power required by the household appliance is greater than the single-path rated power of the household appliance, the household appliance enters a high-power heating mode; the high-power heating mode is a heating mode in which at least two paths of heating loads of the heating electric appliance are started in a peak shifting manner for heating. In the embodiment of the invention, the heating power of the household electrical appliance can be improved by arranging at least two heating loads in the household electrical appliance, and the at least two heating loads in the heating electrical appliance can be turned on in a peak shifting manner in a high-power heating mode to prevent surge current superposition generated in the starting process of the heating loads. And the internal circuit of the household circuit is protected, and the UL authentication requirement is also met.

A power converter comprises a power conversion circuit and a housing. The power conversion circuit comprises a voltage input, a voltage output, a first DC-DC voltage converter, and a second DC-DC voltage converter coupled to the first DC-DC voltage converter via a converter output bus. A first capacitor terminal is coupled to a first rail of the converter output bus and an inrush circuit coupled to a second rail of the converter output bus and coupled to a second capacitor terminal. The housing comprises a length no greater than 117.3 mm. The second capacitor terminal is coupled to the second rail only via the inrush circuit.

The utility model provides a power-down holding circuit for a switching power supply, which relates to the technical field of switching circuits and comprises a thermistor RT2, a diode D1 and a plurality of electrolytic capacitor banks connected in parallel, and the thermistor RT2 is connected in series with the electrolytic capacitor banks after being connected in parallel with the diode D1. According to the utility model, the circuit structure is simple, and components are few; the impact current is effectively reduced by adopting the power-down holding circuit; and after the input power supply is cut off, the diode D1 is used for discharging the loop, so that the output delay power failure is realized. Meanwhile, by changing parameter matching and device type selection of the power-down holding circuit, different power-down holding time is achieved, the performance is reliable, and therefore the design cost is greatly reduced.

Provided is a technique for preventing an inrush current from flowing through a snubber capacitor. A dual inverter system for an open winding motor includes: a motor; a first inverter and a second inverter; a positive electrode switching circuit and a negative electrode switching circuit disposed between the second inverter and the battery; and a control device capable of switching a driving mode of the motor between a single mode in which the two switching circuits are turned off and only the first inverter is switched, and a dual mode in which the two switching circuits are turned on and the first inverter and the second inverter are switched. The second inverter has a snubber circuit that electrically connects the positive electrode terminal and the negative electrode terminal and is provided with a snubber capacitor, and when the driving mode of the motor is switched from a single mode to a dual mode, the control device closes only the negative electrode switching circuit in a state in which the positive electrode switching circuit is kept open and only closes the negative electrode switching circuit in a state in which the positive electrode switching circuit is kept open. Therefore, the buffer capacitor is pre-charged.

The utility model provides a switching circuit and an automobile, relates to the technical field of automobile electronics, and aims to reduce the influence of inrush current on the switching circuit. The switching circuit comprises a connecting circuit and a control circuit; the first end of the connecting circuit is used for coupling the power supply circuit, the second end of the connecting circuit is used for coupling the power utilization circuit, and the third end of the connecting circuit is coupled to the control circuit; the control circuit is configured to respond to a received control signal, control the connection circuit to be switched from a first state to a second state, and enable the connection circuit to be switched from the second state to a third state after a preset time; in the first state, the voltage of the third end of the connecting circuit is greater than the voltage of the third end of the connecting circuit in the second state; and in the second state, the voltage of the third end of the connecting circuit is greater than the voltage of the third end of the connecting circuit in the third state.

A surge protection device (SPD) module includes a module housing, first and second module electrical terminals mounted on the module housing, a surge limiting element electrically connected between the first and second module electrical terminals, and a thermal disconnect mechanism. The thermal disconnect mechanism is mounted in a ready configuration, where the surge limiting element is electrically connected to the second module electrical terminal. The thermal disconnect mechanism can be repositioned to electrically disconnect the surge limiting element from the second module electrical terminal.The thermal decoupling mechanism includes: an electrode electrically connected to the surge limiting element; a decoupling spring resiliently deflectable and electrically connected to the electrode in the ready configuration; a tin that secures the decoupling spring in electrical connection to the electrode in the ready configuration; and a heat sink member thermally superposed between the electrode and the tin, the heat sink member having thermal capacity. The tin can melt in response to overheating of the surge limiting element. The decoupling spring is configured to electrically disconnect the surge limiting element from the second electrical terminal of the module when the tin melts.The thermal capacitance of the reservoir member regulates and dissipates heat from the surge limiting element to prevent tin melting in response to at least some surge currents through the SPD module.

The invention discloses a pre-charging circuit and electronic equipment. The pre-charging circuit is provided with a pre-charging loop circuit, a voltage detection circuit and a control drive circuit, and can pre-charge a capacitor of a load through the pre-charging loop circuit at the moment of power supply, so that surge current generated in the circuit can be reduced, and the problem that a battery device and an electric device are damaged by the surge current at the moment of power supply is reduced. On the other hand, in the pre-charging process, the change of the voltage on the capacitor of the load can be detected through the voltage detection circuit, the control drive circuit can receive the feedback of the detection circuit, and when the voltage of the capacitor on the load reaches the threshold voltage, the pre-charging loop circuit is automatically controlled to be switched off, and pre-charging is stopped; according to the technical scheme, the on-off of the pre-charging loop circuit does not need to be controlled through additional software, in addition, the on-off of the pre-charging loop circuit is automatically controlled through the feedback of the voltage detection circuit, and the on-off of the pre-charging loop circuit can be more accurately controlled.

The invention discloses a magnetic coupling surge protection device based on an amorphous ferrite material, which comprises an amorphous ferrite magnetic core, a secondary side inductor, a secondary side resistor, a bias conductor and a bias power supply, is nested outside a high-voltage direct-current transmission line, and forms magnetic field coupling with the high-voltage direct-current transmission line through the amorphous ferrite magnetic core in the device. When suddenly changed surge current flows through the device, a rapidly changing magnetic field is excited in the amorphous ferrite material, the magnetic field provides equivalent inductance for the high-voltage direct-current transmission line, and meanwhile, the rapidly changing magnetic field generates induced electromotive force in the bias conductor and generates induced current; the induced current generates heat loss in the process of flowing through the secondary side resistor, and surge current energy in the high-voltage direct-current transmission line is converted into the heat loss of the secondary side resistor through the process, so that surge protection is realized. The invention has the advantages of high saturation magnetic flux density, high relative permeability, excellent high-frequency performance and the like, and is suitable for the operation condition of magnetic coupling surge protection equipment.

The invention relates to the technical field of charging piles, and provides a service life prediction method and a service life prediction system for a direct current charging pile SPD, and the method comprises the steps: monitoring the working voltage of the direct current charging pile SPD, and generating a working voltage curve; the surge current and the duration time are calculated according to the working voltage curve; determining a corresponding maximum surge current derating curve according to the surge current and the duration; calculating the cumulative damage ratio of the SPD according to the maximum surge current derating curve; and predicting the life times of the SPD according to the cumulative damage ratio. The surge current is speculated by monitoring the working voltage of the SPD, the cumulative damage ratio of the SPD is calculated according to the speculated surge current, the service life times of the SPD are predicted according to the cumulative damage ratio, real-time online monitoring of the whole life cycle of the SPD in the direct-current charging pile is achieved, the service life state of the SPD can be accurately controlled, and the initiative and timeliness of SPD operation and maintenance management are remarkably improved.

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 utility model relates to the technical field of communication testing, in particular to a protection circuit of an RS232 interface chip. The protection circuit comprises a small PCB (printed circuit board); the two standard RS232 interfaces are respectively a J1 interface for a female head and a J2 interface for a male head; a current-limiting resistor R1 and a current-limiting resistor R2; a filtering magnetic bead FB1 and a filtering magnetic bead FB2; a bidirectional transient suppression diode TVS1 and a bidirectional transient suppression diode TVS2; and a filter capacitor C1 and a filter capacitor C2. According to the protection circuit of the RS232 interface chip, when two devices need to be connected with interface debugging signals, glitch voltage and impact current can be effectively absorbed and filtered out through combination of electronic components of the protection circuit, impact of overcurrent and overvoltage problems on the chip can be reduced to a certain extent when the interface is plugged and unplugged, and the reliability of the chip is improved. The purpose of protecting the interface chip is achieved.

The utility model discloses a microwave motion inductive device, including circuit board, power interface, output interface, paster relay, circuit board has welded radio frequency module, radio frequency module electric connection has resistance module group and condenser module group, and power interface passes through triode and resistance module group and condenser module group and radio frequency module electric connection, and output interface and radio frequency module electric connection, and paster relay is welded on the circuit board, and paster relay is connected in parallel with triode, and paster relay passes through circuit board and resistance module group and condenser module group and radio frequency module electric connection, through triode to the power of power interface input plays the voltage stabilizing and current limiting effect, ensures radio frequency module and paster relay stable work, and the peak value and duration of surge current can be reduced with resistance module group, condenser module group, limit surge current size, improve radio frequency module and paster relay stable service life, and service life is long.

The utility model discloses a surge current suppression circuit suitable for high-voltage input, which belongs to the technical field of power electronics and comprises an MOS (metal oxide semiconductor) tube, a triode, a first capacitor and a second capacitor. A collector electrode of the triode is connected to a power supply positive electrode line through a resistor, an emitter electrode of the triode is connected to a power supply negative electrode line, a base electrode of the triode is divided into two paths, one path of the base electrode of the triode is connected with a source electrode of the MOS tube through a sixth resistor, and the other path of the base electrode of the triode is connected with a drain electrode of the MOS tube through a fourth resistor; one end of the first capacitor is connected between the second resistor and the first resistor, and the other end of the first capacitor is connected to the power supply cathode line; and the MOS tube is connected to a power supply cathode line. Compared with the prior art, the circuit does not need an auxiliary power supply and an operational amplifier circuit, so that the cost and the arrangement space are saved, the related requirements of GJB181A-2003 on the input current are met, and the power supply and front-end equipment can be protected.

This invention relates to the field of power system technology and discloses a voltage regulation system for reactive power compensation equipment. The system first eliminates harmonic interference through a voltage and reactive power sensing unit to obtain accurate grid parameters. Then, a load trend prediction unit analyzes historical load curves and real-time trends to generate future prediction signals. A dynamic compensation calculation unit combines the current grid status with this prediction to calculate the optimal compensation capacity and generate switching commands. Upon receiving the command, the hybrid switching actuator first triggers the thyristor to achieve inrush-free conduction. After the current stabilizes, it switches the contactor to maintain low power consumption. Simultaneously, the compensation status monitoring unit adjusts parameter deviations in a closed loop, a multi-dimensional protection unit prevents overvoltage, overcurrent, and overheating, dual power supplies ensure continuous operation when the main power supply is abnormal, and an intelligent communication unit enables data uploading and remote collaboration. This system achieves rapid response switching of the reactive power compensation equipment and ensures the safety of a large-scale power grid, effectively suppressing inrush current impacts during the switching process.