99 results about "Reverse current" patented technology

This application provides a stepper motor driving device, method, and system, relating to the field of equipment control technology. The device includes: a first signal generation module for generating a first SPWM signal and a second SPWM signal; wherein the first SPWM signal and the second SPWM signal have the same waveform but are time-staggered by half a carrier cycle; and a first current control module for applying the first SPWM signal and the second SPWM signal to the upper bridge arm switches on both sides of a first H-bridge driving circuit, respectively, to control the magnitude and direction of the first driving current. This application, by staggering the SPWM control signals on both sides of the same H-bridge by half a cycle, naturally divides the H-bridge behavior into two driving segments and two slow decay modes within a driving cycle, effectively avoiding reverse current during the driving process, reducing operating noise, and improving driving efficiency.

The present disclosure relates to a level shifter for shifting a voltage signal from a first voltage domain to a second voltage domain, the level shifter comprising: an input circuit configured to receive a voltage signal in the first voltage domain, an output circuit configured to output a voltage signal in the second voltage domain, and a protection circuit configured to prevent a reverse current flow between the input circuit and the output circuit.

This invention belongs to the field of wireless communication technology and discloses a dual inverted "L" broadband low-coupling MIMO mobile phone antenna based on a parasitic grounded stub. This invention proposes a novel antenna structure. This design effectively solves the contradiction between broadband performance and high isolation while maintaining a simple and compact structure. The decoupling and broadband principle of this invention is as follows: an inverted L-shaped parasitic grounded stub with a bent end is introduced below the inner side of the radiating arm. This stub can generate a new coupling path, and the reverse current induced in it exactly cancels the coupling current received by the main radiating arm, achieving decoupling between ports. By slotting on the horizontal arm of the inverted L-shaped radiating stub, a new resonant point is generated in the antenna, effectively widening the antenna's operating bandwidth.

The utility model relates to a semiconductor device and its packaging technical field, specifically disclose a kind of module terminal and HPD packaging module using laminated busbar structure, including DC terminal, DC terminal includes: two ends and chip and direct current power supply intercommunication's first component and second component, first component and second component current is opposite;First component and second component form laminated busbar structure to offset reverse current magnetic field, the partial area of first component and the overall area of second component overlap to expand magnetic field offset effective area.The utility model forms laminated busbar structure by setting first component and second component, offset the magnetic field generated by reverse current, secondly, the projection area of second component is the effective overlapping area of first component and second component, to expand the effective area of magnetic field offset as far as possible, to reduce total magnetic flux without affecting laser welding, to reduce stray inductance, improve system reliability.

The utility model discloses a high-capacity capacitor pre-charging circuit which comprises an input voltage circuit, a relay circuit, a buffer circuit, an MCU control circuit, an anti-backflow circuit and an output voltage circuit. One end of the relay circuit is connected with the positive input end of the input voltage circuit, and the other end is connected with the positive output end of the output voltage circuit; the first end of the buffer circuit is connected with the positive input end of the input voltage circuit, the second end is connected with the positive output end of the output voltage circuit, and the third end is connected with the negative output end of the output voltage circuit; one end of the MCU control circuit is connected with the input voltage circuit, and the other end is connected with the buffer circuit; one end of the anti-backflow circuit is connected with the negative input end of the input voltage circuit, and the other end is connected with the negative output end of the output voltage circuit. According to the pre-charging circuit, the anti-backflow circuit is arranged, so that the phenomenon of current backflow of the circuit caused by impact of large current generated in the pre-charging process on the circuit structure is prevented, and the safety and the reliability of the pre-charging circuit are improved.

The application provides a battery fast charging protection method and device based on reverse current detection and electronic equipment, and belongs to the technical field of battery management. The method comprises the following steps: acquiring current direction information of a charging current flowing through an internal battery of the electronic equipment; determining that the current direction information represents a reverse current state from the battery to a charger; in response to the determination of the reverse current state, generating and outputting a discharge control signal based on parameter information of the reverse current state; controlling a power switch circuit connected to the battery to apply a controllable discharge current pulse to the battery according to the discharge control signal; and through real-time monitoring and response to the harmful reverse current generated by the battery, precise and adaptive protection intervention is realized, so that the average current of the fast charging process is optimized, and the charging efficiency is effectively improved under the premise of guaranteeing the safety and service life of the battery.

A bidirectional circuit breaker has Breaking Speed Control (BSC) to prevent false triggering when an upstream fault occurs. A semiconductor switch has a Metal Oxide Semiconductor Field Effect Transistor (MOSFET), an Insulated Gate Bipolar Transistor (IGBT), and a varistor in three parallel branches that drive a positive output. An input capacitor between positive and negative inputs forms an LC network with an inductor connected to the positive input. A current sensor is connected between the inductor and the semiconductor switch. When the current sensor detects reverse current, a snubber switch is closed, connecting a snubber capacitor across both terminals of the inductor. A LCC network is formed that stores more energy than the LC network, spreading out a current spike caused by the upstream fault, reducing peak reverse current pulled through the circuit breaker by the upstream fault. Thus breaking speed is reduced when the snubber switch closes.

This invention relates to a power supply system for an electricity meter and its rechargeable battery protection circuit, belonging to the field of power protection technology. The invention integrates an anti-backflow unit within the step-down conversion module to prevent current from the rechargeable battery from flowing back into the power input module, thereby reducing capacitor ineffective losses. It also integrates a current-limiting unit and a first unidirectional conduction unit within the charging control module. The current-limiting unit restricts the charging current flowing to the rechargeable battery, while the first unidirectional conduction unit ensures that the charging current flows unidirectionally to the rechargeable battery. The current-limiting unit controls the charging current through its own resistance characteristics, avoiding damage to the battery from abnormal current (too high / too low). The first unidirectional conduction unit ensures that the charging current flows unidirectionally to the battery, preventing reverse current from flowing into the circuit during battery discharge, achieving a balance between "efficient charging + battery protection," thereby improving circuit reliability and battery lifespan.

An ideal diode bridge controller is provided that includes gate drivers to connect to transistors of a bridge rectifier in which the transistors are arranged as high-side transistors and low-side transistors. The gate drivers alternately switch the transistors to cause the bridge rectifier to convert an input voltage of either of two polarities to an output voltage of one of the two polarities. The gate drivers include low-side gate drivers for the low-side transistors, and respective ones of the low-side gate drivers include linear drive circuitry and digital drive circuitry. The linear drive circuitry drives a respective low-side transistor to switch on and off based on forward current through the respective low-side transistor. The digital drive circuitry detects a reverse current through the respective low-side transistor, and causes the respective low-side transistor to switch off in response to the reverse current.

This utility model relates to the field of electronic device technology, specifically to a power terminal group structure and a power semiconductor module, including a first power terminal and a second power terminal. Both the first and second power terminals are gate-shaped structures mounted on an insulating substrate. The vertical connection portions of the first and second power terminals are mirror-symmetrical structures. This utility model, through the mirror-symmetrical layout of the gate-shaped terminals, constructs a tightly coupled, low-inductance commutation circuit with minimized area. It utilizes the magnetic field cancellation effect of the reverse current to significantly suppress stray inductance, thereby reducing switching losses and voltage spikes, improving the module's switching frequency capability and power density, and enhancing system reliability.

The present disclosure relates to a joint motor cogging compensation method and device. The method comprises: performing a step response test on the joint motor, adjusting the motor control parameters based on the test results; controlling the joint motor to run at a first preset step size, recording the current feedback value corresponding to each preset step position point corresponding to the first preset step size, determining the period length of the cogging torque based on the variation characteristics of the current feedback value; determine the sampling step size based on the period length, control the motor to rotate at least one round in the forward and reverse directions respectively, record the forward current and reverse current of each sampling position point corresponding to the sampling step size; calculate the compensation current reference value of each sampling position point to obtain the mapping relationship between the sampling position point and the compensation current reference value; according to the current joint motor position and the mapping relationship, the target compensation current is calculated by using the interpolation algorithm, and the target compensation current is applied to the control loop of the joint motor. The present scheme improves the running smoothness of the joint motor.

This application provides a method for fabricating a fast recovery diode, a fast recovery diode, and an electronic device, relating to the field of semiconductor technology. The method for fabricating a fast recovery diode includes: providing a substrate, the substrate including a first surface and a second surface disposed opposite to each other; performing ion doping treatment on the substrate to form ion-doped regions on the first surface and the second surface; etching the first surface based on a predetermined etching region to form a first groove; wherein the depth of the first groove is greater than the thickness of the ion-doped region; the predetermined etching region is located at the center of the first surface; forming a passivation layer in the first groove; and performing metal evaporation on the first surface to form a first metal layer. This method not only reduces the conduction loss of the fast recovery diode, improves energy conversion efficiency, effectively suppresses reverse current, and reduces electromagnetic interference, but also enhances its resistance to avalanche breakdown energy and surge capability.

The application provides a high-compact integrated interface device suitable for on-orbit assembly of a spacecraft, comprising a passive end assembly and an active end assembly, the passive end assembly comprising a passive end shell, a first permanent magnet and a locking piece, and the active end assembly comprising an active end shell, an electromagnet, a second permanent magnet, a locking assembly and an excitation control circuit; the electromagnet is arranged between the first permanent magnet and the second permanent magnet, and the magnetic pole arrangement directions of the first permanent magnet and the second permanent magnet are opposite; the locking piece is mounted on the end face of the passive end shell, and the locking assembly is correspondingly mounted in the active end shell. The application controls active adsorption and active separation between the passive end assembly and the active end assembly by passing positive current or reverse current to the electromagnet, has small space occupation, high compactness, is suitable for on-orbit docking of a small module, needs to consume energy only at the moment of switching between the locking and separation states, does not need to consume energy in normal state, and improves the service life.

The application discloses a continuous mode bridgeless power factor correction circuit and a control method thereof, which comprises an alternating voltage source AC, a diode D1, a diode D2, a main switch Q1, a main switch Q2, an output capacitor C1, a positive half cycle control circuit and a negative half cycle control circuit. In the application, the freewheeling diode is reversely biased before the main switch is turned on, and the current is transferred to the control circuit auxiliary super-fast diode branch. The body diode of the freewheeling diode has no reverse current when the main switch is turned on, and can work at high frequency. Through proper dead zone setting, the freewheeling diode can realize zero voltage switching. The control circuit only works for a short time, the control method is simple, the average power is small, and the cost is low.

The present application relates to the technical field of power electronics, in particular to a power converter and a control method thereof, the power converter is suitable for the application scene of outputting stable voltage according to wide range of input voltage, the conduction state of each switch is controlled according to the duty cycle of the power converter in a specific time region to avoid the generation of reverse current, while reducing the generation of thermal energy, the stability of the circuit and the conversion efficiency of the power converter can also be improved, secondly, the voltage value of the input voltage can be shared by setting the first capacitor Cb1 and the second capacitor Cb2, so that the duty cycle of all switches can be doubled, and the voltage stress of all switches and the setting difficulty of the corresponding control signal are further reduced.

This invention discloses an automated grid-connected anti-reverse current testing system, comprising a load simulation unit for simulating the load environment of actual power consumption scenarios; a power generation simulation unit for simulating a photovoltaic power generation network supplying power to the load simulation unit; an anti-reverse current device for connecting the load simulation unit and the power grid, and controlling the power generation of the power generation simulation unit based on real-time power measurements to prevent reverse current phenomena; and a power detection device for detecting the magnitude and direction of power between the anti-reverse current device and the power grid. In this invention, grid-connected anti-reverse current testing is performed using the load simulation unit and the power generation simulation unit. The testing system has a simple structure and low hardware cost.

The application relates to the technical field of new energy, and particularly discloses a reverse current prevention control method for a charging and discharging station, an electronic device and a storage medium, wherein the method comprises the following steps: acquiring real-time gateway power of the charging and discharging station and real-time charging and discharging state data of each charging and discharging pile; determining power distribution weights corresponding to each charging and discharging pile according to the real-time charging and discharging state data of each charging and discharging pile; for each charging and discharging pile, adjusting the discharging power of the charging and discharging pile according to the real-time charging and discharging state data of the charging and discharging pile, the corresponding power distribution weight and the acquired gateway power deviation value. In the application, when it is detected that the real-time gateway power of the charging and discharging station approaches or reaches a preset reverse current prevention threshold power, the discharging power of the charging and discharging pile can be dynamically adjusted, so that the total discharging power of the charging and discharging pile does not exceed the power consumption of the station, the total power of the station is ensured to be kept within a safe threshold range, and the reverse current risk is reduced.

The present invention provides a semiconductor device that can turn on an output transistor even during a period when a reverse current is generated from the load toward the output transistor. [Solution] The discharge transistor 12 is formed on a semiconductor substrate and, when controlled to be ON, short-circuits the gate of the power transistor 7 with the reference node N9, thereby controlling the power transistor 7 to be OFF. The reverse current detection circuit 63 detects the generation of a reverse current Iinv from the power output terminal 2 toward the power supply terminal 1 and asserts a reverse current detection signal INVD during the period in which the reverse current Iinv is generated. The switch control circuit 75 controls switch SW1 to be ON and switch SW2 to be OFF during the negate period of the reverse current detection signal INVD, and controls switch SW1 to be OFF and switch SW2 to be ON during the assertion period of the reverse current detection signal INVD.

A bidirectional circuit breaker has Breaking Speed Control to prevent false triggering when an upstream fault occurs. A semiconductor switch has a Metal Oxide Semiconductor Field Effect Transistor (22), an Insulated Gate Bipolar Transistor (24), and a varistor (30) in three parallel branches that drive a positive output. An input capacitor (36) between positive and negative inputs forms an LC network with an inductor (42) connected to the positive input. A current sensor (40) is connected between the inductor (42) and the semiconductor switch. When the current sensor (40) detects reverse current, a snubber switch (32) is closed, connecting a snubber capacitor (34) across both terminals of the inductor (42). A LCC network is formed that stores more energy than the LC network, spreading out a current spike caused by the upstream fault, reducing peak reverse current pulled through the circuit breaker by the upstream fault. Thus breaking speed is reduced when the snubber switch (32) closes.

Forming plural bumps on a substrate in such a manner that the bumps have uniform heights. A plating apparatus for forming bumps on a substrate is provide. The plating apparatus comprises: a substrate holder constructed to hold the substrate; a plating tank constructed to store plating liquid and the substrate holder; an anode arranged in the inside of the plating tank in such a manner that the anode faces the substrate held by the substrate holder; an electric power source constructed to supply electric current flowing between the substrate and the anode; and a controller; wherein the controller is constructed to make the electric power source output electric current that comprises a first period during that positive-direction electric current is supplied for depositing metal on the substrate from the plating liquid, a second period during that at lest one reverse-current pulse, that flows in a direction opposite to a direction of the positive-direction electric current, is supplied, and a third period during that supplying of electric current is stopped, wherein the third period is a period in the middle of a transition from the reverse-current pulse to the positive-direction electric current.

The application discloses a high-aspect-ratio PCB through-hole pulse electroplating method based on deep plating capacity time evolution law. The method comprises the following steps: (1) selecting at least two pulse electroplating waveforms with different positive and negative current density ratios and positive and negative time ratios, and performing single waveform electroplating experiments on target PCB through holes; (2) measuring the hole plating layer thickness and the plate surface plating layer thickness of the PCB through hole under different electroplating time conditions, and calculating the deep plating capacity TP value respectively; (3) according to the law of the deep plating capacity TP value changing with the electroplating time, the deep plating capacity advantage time interval corresponding to each pulse electroplating waveform is determined; (4) different pulse electroplating waveforms are matched and combined according to the deep plating capacity advantage time interval, and then the target PCB through hole is electroplated, so that the problem that a single waveform cannot simultaneously consider the deposition rate and uniformity in the electroplating of the high-aspect-ratio PCB through hole in the prior art is solved.

This invention discloses a dynamic assessment method for equipment load capacity under frequent power flow switching conditions, belonging to the field of load assessment technology. It addresses the problem of reduced safety and reliability in equipment operation and control. By identifying power flow direction changes in the distribution transformer area under test and constructing power flow switching intervals, the method acquires transformer top-level oil temperature data within these intervals and analyzes thermal inertia trends. Combined with tap changer position information, it assesses the residual switching state, filters and marks intervals with state stagnation, further extracts the duration and peak characteristics of reverse current in each photovoltaic access branch, classifies reverse power dominance levels, implements power limiting control for high-dominance branches, and assesses voltage regulation stability based on the tap changer position change frequency after power limiting. This generates the transformer load capacity status, improving the accuracy and reliability of assessing the actual load capacity of transformers under frequent power flow switching conditions.

This application provides a power conversion device and its control method. The power conversion device includes an auxiliary circuit and a four-switch Buck-Boost circuit. The auxiliary circuit is connected in parallel with the first switch in the four-switch Buck-Boost circuit. By utilizing the charging and discharging of the auxiliary circuit, a reverse current is provided to the first switch in the four-switch Buck-Boost circuit to achieve zero-current turn-off of the first switch, thereby reducing the turn-off loss of the switch. This improves the operating efficiency of the power conversion device.

This application discloses an anti-reverse current control method, device, and energy storage system. The anti-reverse current control method determines whether reverse power occurs at the grid connection interface while the energy storage device is in a discharging state. If so, it controls the energy storage power converter to gradually reduce the output power value and controls the reverse power protection device to enter a locked state, making the grid connection switch in a conducting state. It acquires the current output power of the energy storage power converter and the duration of the reverse power, compares the duration with a preset time threshold, and compares the current output power with a first power threshold. When the duration of the reverse power is less than the preset time threshold, it controls the reverse power protection device to maintain the locked state. When the duration of the reverse power is greater than or equal to the preset time threshold, but the output power is still less than the first power threshold, it controls the reverse power protection device to exit the locked state. This application can effectively balance the operational reliability of the energy storage system with the accuracy of protection actions.

This invention discloses a three-phase power grid phase sequence identification system and method, relating to the field of power electronics technology. The system includes a three-phase power grid, at least one AC source electrically coupled to a single phase of the power grid, at least one AC load electrically coupled to a single phase of the power grid, and a power acquisition device. The power acquisition device is communicatively connected to the AC source. This invention defines the phase sequence of the three-phase power grid based on the phase sequence of the power acquisition device. By controlling the output power of each AC source to change abruptly, it synchronously detects the corresponding changes in the three-phase power grid electrical signals and automatically determines the electrical coupling phase sequence of each AC source. This invention requires no additional hardware costs; automatic phase sequence identification can be achieved solely through software logic. This significantly reduces the construction and commissioning difficulty of three-phase AC systems such as photovoltaic power generation systems, solves the problems of time-consuming, labor-intensive, and error-prone manual phase sequence checks, and provides a reliable phase basis for phase-by-phase anti-reverse current control.

This application relates to the field of energy storage, disclosing an energy storage system, a control method for the energy storage system, and an energy storage cabinet. A static transfer switch directly collects the real-time power value of the load and transmits it to an energy storage converter. The energy storage converter directly adjusts its output power value in real time based on the real-time power value of the load transmitted by the static transfer switch. This direct and rapid data interaction between the static transfer switch and the energy storage converter effectively shortens the transmission path of the real-time power value of the load, reducing the response time of the energy storage system to load power fluctuations from hundreds of milliseconds to tens of milliseconds. This significantly improves the response speed of the energy storage converter to load power fluctuations, enabling the energy storage system to quickly track load power fluctuations and reduce the risk of reverse current. Furthermore, this energy storage system can more fully utilize new energy sources, reduce the consumption of grid power, and save on electricity costs.

This disclosure discloses an electronic price tag system relating to the price tag field, comprising a transducer, a transducer reverse current protection circuit, a primary battery, a primary battery reverse charge protection circuit, and an electronic price tag body module, wherein the electronic price tag body module includes a microcontroller unit (MCU) that transmits a first control signal to the primary battery reverse charge protection circuit to control the power supply to the primary battery, the transducer converts at least one energy into electrical energy to supply power to the electronic price tag body module, the transducer reverse current protection circuit prevents current in the electronic price tag system from flowing back to the transducer, the primary battery supplies power to the electronic price tag body module based on a second control signal, and the primary battery reverse charge protection circuit prevents the transducer or other energy source from charging the primary battery. This disclosure provides an electronic price tag with a complementary multi-power supply system of various clean energy sources and a primary battery that is long-lasting and flexible in deployment.

Provided is a semiconductor light-emitting device that has better light-emitting characteristics and improved reverse current characteristics compared to conventional light-emitting devices. 【Solution means】 The semiconductor light-emitting device according to the present invention is a semiconductor light-emitting device including a quantum well type light-emitting layer of a group III-V compound semiconductor in which a barrier layer and a well layer are repeatedly laminated. The barrier layer is AlGaInAs containing P 1-x P x consisting of (0 < x < 1), and the well layer is AlGaInAs 1-y P y consisting of (0 ≦ y ≦ x). The composition wavelength difference between the composition wavelength λ w of the well layer and the composition wavelength λ b of the barrier layer is 500 nm or more.

The utility model relates to uninterrupted power supply technical field discloses a UPS uninterrupted power supply control management system, include: rectifier module, inverter module static switch module, power management module, power control module. Utilize three level operational amplifier feedback network and dynamic compensation resistance, when input voltage fluctuation, through operational amplifier real -time adjustment PWM duty cycle, the precision of stability is improved obviously, and utilize diode D1 to suppress reverse current, reduce the interference of power grid harmonic to charging circuit, chip IC1 can drive two MOS tubes independently, and two MOS tubes parallel connection can reduce the conduction loss, combine adjustable resistance regulation output frequency, realize the seamless switching of high frequency and low frequency. The field effect transistor is connected with the triode and constitutes the composite switch, eliminates switching surge with delay circuit (C13 and R23), and obviously shortens switching time, and capacitor C13 can absorb switching transient peak, avoids the restart of load equipment.

The present invention forms a plurality of bumps at a uniform height on a substrate.　A plating device for forming a plating film on a substrate includes: a substrate holder for holding the substrate; a plating tank for storing a plating solution together with the substrate holder; an anode disposed in the plating tank so as to face the substrate held by the substrate holder; a power supply for supplying a plating current between the substrate and the anode; and a control unit. The control unit causes the power supply to output a plating current that repeats a forward current period in which a forward current for causing a metal to be deposited on the substrate from the plating solution is supplied, a reverse current period in which a reverse current pulse flowing in the opposite direction to the forward current is supplied, and a current pause period in which the supply of current is paused partway during a transition from the reverse current pulse to the forward current. The control unit controls the length of the current pause period such that the width of fluctuation of the plating voltage after the reverse current pulse is supplied falls within a predetermined range.