21results about How to "Reduce current shock" patented technology

The invention relates to the technical field of equipment control, in particular to a self-adaptive switching method and system of a current transformer. The method comprises the following steps: collecting primary side parameters and secondary side parameters of a current transformer to obtain primary side collection parameters of the current transformer and secondary side collection parameters of the current transformer; performing current transformer state segmentation initialization according to the current transformer primary side acquisition parameters and the current transformer secondary side acquisition parameters so as to generate a current transformer operation state classification result; switching result judgment is conducted on the current transformers according to the current transformer operation state classification result, and when the current transformer operation state classification result is a current transformer critical state section, parallel buffering is conducted on the current transformers, and critical current transformer switching data are generated. According to the invention, through accurate state classification, a dynamic switching mechanism, time sequence optimization and visual display, the switching sensitivity and stability of the current transformer are improved.

The invention discloses a power supply system containing a hybrid energy storage and diesel generator two-stage emergency power supply, which relates to the technical field of power supply systems and comprises an alternating current bus, a system power supply, an energy storage device, a diesel generator, an important load and an unimportant load. The system power supply comprises a frequently-used power supply and a standby power supply which are respectively connected to the AC bus through switches; the energy storage device consists of a hybrid energy storage system, a three-phase inverter, a filtering unit and an energy storage switch, and is connected to the alternating current bus; the diesel generator is connected to the bus through the grid-connected switch; the loads are divided into important loads and unimportant loads, and the system has four switchable states of common power supply-energy storage parallel connection, standby power supply-energy storage parallel connection, energy storage power supply and diesel generator-energy storage parallel connection so as to ensure stable power supply.

The invention discloses a grid-connected control method, a grid-connected control system and grid-connected control equipment for a four-quadrant frequency converter, and particularly relates to the technical field of grid-connected control, and the technical key points are as follows: determining a grid voltage phase sequence and a phase reference angle of a grid voltage signal by using a three-phase phase-locked loop under a DQ coordinate system; determining a voltage input signal and an initialization angle of an SOGI phase-locked loop according to the power grid voltage phase sequence and the phase reference angle, performing phase locking on the power grid voltage of which the total harmonic distortion rate exceeds a preset distortion threshold by using the SOGI phase-locked loop, and outputting a grid-connected feedforward signal when the power grid voltage and the power grid voltage phase sequence meet a grid-connected condition; according to a preset grading rule, each power unit in the four-quadrant frequency converter is divided into different grid-connected grades, and based on a grid-connected feedforward signal, the phase-locked four-quadrant frequency converter controls a switching device to realize grading grid-connected control on the power units of different grid-connected grades according to a preset grid-connected mode.

The present application provides a capacitor discharge control method, device, equipment and storage medium. The method obtains the voltage of a first capacitor and the voltage of a second capacitor respectively to obtain the first voltage and the second voltage; determines the average duty cycle of an electric drive boost charging circuit according to the first voltage and the second voltage; determines the duty cycle adjustment value for capacitor discharge of the first capacitor and the second capacitor according to a preset current relationship, wherein the duty cycle adjustment value is used to adjust the B-phase duty cycle and the C-phase duty cycle in the electric drive boost charging circuit; performs capacitor discharge on the first capacitor and the second capacitor according to the average duty cycle and the duty cycle adjustment value, realizes simultaneous discharge of the first capacitor and the second capacitor, ensures the discharge speed, and controls the current smoothly, reduces the current impact, reduces the cost without adding additional equipment, and improves the safety of the electric drive boost charging circuit.

The application provides a kind of intelligent switch cabinet operation control system and method, including control unit, operating current acquisition module, soft start control unit, motor control unit, software anti-misoperation logic module, wherein, software anti-misoperation logic module is used to verify circuit breaker opening and closing state, electric chassis pose state, electric grounding knife opening and closing state and network cabinet door opening and closing state;Control unit is deployed in power monitoring system safety I area, and control unit is connected and interacted with remote host computer or sequential control host computer through communication interface, and communication interface supports the transmission of single task single command, combined task single command and combined task combined command, operating current acquisition module real-time acquisition motor operating current and wave recording, and wave recording data is uploaded to remote host computer or sequential control host computer for verification through communication interface.The application has low cost, with operating wave recording, soft start, multiple anti-misoperation and motor protection functions, to meet the requirements of "power monitoring system safety protection regulations" partition.

The invention discloses a self-adaptive control method and system for primary frequency modulation of a power grid, and relates to the technical field of power system automation and new energy grid-connected control, and the method comprises the following steps: when the energy storage residual electric quantity is within the range of 15%-25%, the energy storage output power is greater than 30% of the rated power, and the absolute value of the frequency deviation of the power grid is greater than 0.08 Hz, controlling the frequency of the power grid; the fixed virtual inertia is replaced with a two-dimensional matrix changing in real time along with the residual electric quantity and the direct current bus voltage, virtual capacitance current in the direction for preventing the direct current bus voltage from dropping is synchronously generated, and the magnitude of the virtual capacitance current is in direct proportion to the change rate of the direct current bus voltage; in the cliff interval with the energy storage residual electric quantity of 15%-25%, the phenomenon of undervoltage locking at the moment of primary frequency modulation high-power discharge caused by fixed virtual inertia is thoroughly eliminated, the frequency secondary collapse probability is reduced to zero, and no hardware is added.

The invention provides a three-dimensional scanner and a control method of the three-dimensional scanner. The three-dimensional scanner comprises a control module, a power supply module and at least two functional modules, and each functional module is connected with the control module and the power supply module. The power supply module is connected with a power supply; the power supply supplies power to the at least two functional modules through the power supply module; and the control module is used for controlling the power supply module and the on-off of the power supply circuit of each functional module, so that the total power consumption capacity of the functional modules working at the same time in the same time does not exceed the power supply capacity of the power supply. The control method of the three-dimensional scanner is used for the three-dimensional scanner provided by the invention, and the control method comprises the following steps: controlling the on-off of a power supply circuit of a power supply module and each functional module, so that the total power consumption capacity of the functional modules working at the same time in the same time does not exceed the power supply capacity of a power supply. By controlling the on-off of the power supply circuit of the power supply module and each functional module, the power consumption capacity at the same time is reduced, and the current impact is reduced.

The invention belongs to the technical field of transformer current limiting, and particularly relates to a transformer and an overcurrent suppression device and method. The method comprises the following steps: connecting a current-limiting reactor in series in each phase of the primary side of the transformer, and connecting a switch in parallel with the current-limiting reactor in each phase; firstly, a first-phase switch is controlled to be switched on, and after the first-phase switch is switched on, a second-phase switch is controlled to be switched on when the phase angle of line voltage between a first phase and a second phase is 30 degrees or 210 degrees; after closing of the second-phase switch is completed, primary side and secondary side currents of the transformer are detected, if the primary side and / or secondary side currents exceed the corresponding short circuit threshold value, the third-phase switch is not closed any more, other two-phase switches are controlled to be opened, and a current limiting reactor is connected to the primary side of the transformer; if the primary side current and the secondary side current do not exceed the corresponding short-circuit threshold values, the third-phase switch is controlled to be switched on when the phase angle of the line voltage between the first phase and the third phase is 30 degrees or 210 degrees, and the short-circuit current can be limited while the switching-on surge current of the transformer is limited.

This application relates to an intelligent seedling raising device for aquatic plant seed bank germination experiments, belonging to the field of seed cultivation technology. It includes a cultivation box with wheels, internally equipped with multiple layers of clamps, on which culture dishes containing cultivation troughs and germination paper are placed. An intelligent camera is fixed by a mounting bracket and faces the culture dishes to acquire images. A nozzle can move vertically under the action of a drive mechanism and spray water mist onto the culture dishes. A humidity sensor monitors the humidity inside the box. A heating and cleaning mechanism is linked to the nozzle position; when the nozzle is to the side of the camera, it is in a retracted state to ensure lens imaging; when the nozzle moves down below the camera, the mechanism unfolds and forms a shielding space, spraying and heating air onto the lens to remove moisture and impurities, keeping the lens clear. This device, through the coordinated action of multiple mechanisms, balances water supply, environmental control, and image quality to a certain extent, facilitating the stable conduct of aquatic plant seed germination experiments.

The utility model relates to the technical field of lamp power supplies, aims to solve the technical problem that the existing LED lamp is poor in time delay effect, and discloses an LED gradually-bright and gradually-dark control circuit which comprises an LED assembly, a switch SW, a PNP type triode Q5 and a constant-current driver U11, a collector electrode of the triode Q5 is grounded in series through a first voltage division circuit, and the collector electrode of the triode Q5 is grounded through a second voltage division circuit. An emitter of the triode Q5 is connected to a direct-current power supply V +, an intermediate node of the first series voltage division circuit is connected with an enable end of the constant-current driver U11, the enable end is grounded through a capacitor C21, a power switch end of the constant-current driver U11 is connected with a current sampling end of the constant-current driver U11 sequentially through an inductor L3 and an LED assembly, the current sampling end is connected to the direct-current power supply V + through a current detection resistor, and the direct-current power supply V + is connected with the LED assembly. The power input end of the constant-current driver U11 is connected to the direct-current power supply V +, and the ground end of the constant-current driver U11 is grounded. Compared with an existing circuit, the constant-current driver U11 participates, so that the control precision is high, the dimming ratio is high, and the delay effect is better.

The application discloses a control method for reducing energy consumption of a variable-frequency refrigerator, which judges the temperature difference of an environment sensor, a refrigeration sensor and a freezing sensor, combines to judge the refrigerator load condition, controls the compressor rotating speed, controls the temperature difference of the opening and stopping point of the non-freezing chamber, increases the frequency of the opening and stopping of the non-freezing chamber air door, reduces the temperature fluctuation of the non-freezing chamber, balances the load of each chamber, reduces the starting load, thereby reduces the starting power loss, and realizes the reduction of energy consumption.

The invention provides a low-electromagnetic-noise wave-losing induction cooker, which comprises an LC resonance circuit, an IGBT module, an MCU unit, a gate drive IC and a pot detection circuit, and is characterized in that the MCU unit is connected with the IGBT module through the gate drive IC; the driving voltage range of the IGBT module is 9-18V, and the gate driving IC has a plurality of power supply modes within the driving voltage range of 5-18V; a power judgment module is arranged in the MCU, and when the power judgment module detects that the working power of the induction cooker is lower than 50% of the maximum power, the MCU controls the gate drive IC to be switched to a 9V power supply mode; when the power judgment module detects that the working power of the induction cooker is greater than or equal to 50% of the maximum power, the MCU unit controls the gate drive IC to be switched to a 18V power supply mode; when the pot detection circuit works, the MCU unit controls the gate drive IC to be switched to a 9V power supply mode. According to the low-electromagnetic-noise wave-losing-mode induction cooker provided by the invention, through wide-voltage IGBT model selection and the design of the special driving control module, flexible switching of driving voltage is realized, noise generation is inhibited from the source, and the use experience is improved.

The invention provides a wind turbine generator off-grid operation method and system, and the method comprises the steps: enabling a battery pack and a generator set to be connected with a main control system through an energy storage converter when a wind turbine generator is off-grid; the main control module sends a first instruction to the DCS control system, and the DCS control system controls the variable resistance box to be connected with the main control system after receiving the first instruction; and the main control module sends a second instruction to the generator set, the generator set starts to generate power according to the second instruction and supplies power to the whole wind turbine generator, and the DCS control system dynamically adjusts the resistance of the variable resistance box according to the current in the line. The method solves the problems that in the prior art, when a power grid of a wind power plant breaks down or is in an off-network state, the wind power plant cannot be actively switched to a typhoon-resisting mode for active yawing load reduction, and serious accidents and economic losses are possibly caused.

The invention relates to a soft start circuit for a flyback switching power supply, and the circuit comprises a control chip which is configured to monitor a voltage value fed back from a secondary side of an isolation conversion module through a feedback end in a power-on process of the isolation conversion module; the current limiting loop comprises at least one current limiting resistor and a relay, the relay comprises a magnetic attraction switch and a control coil, and the magnetic attraction switch is configured to connect the at least one current limiting resistor between the positive electrode of the high-voltage battery and the power input end of the control chip in series when the isolation conversion module is powered on; and the feedback control loop is connected between the feedback end of the control chip and the control coil of the relay, and is configured to electrify the control coil of the relay when the voltage value received from the feedback end exceeds a set value so as to switch off the magnetic attraction switch. The invention also relates to a flyback switching power supply comprising the soft start circuit.

The invention provides a control method of a power conversion circuit, power conversion equipment and a power supply system. The control method comprises the following steps: acquiring a real-time alternating-current voltage on a second end of the secondary bridge circuit, and when the real-time alternating-current voltage is in a preset transition region of a voltage zero crossing point, controlling each switching tube in the secondary bridge circuit to perform on-off action within secondary switching time so as to enable the secondary bridge circuit to perform power conversion; and when the real-time AC voltage is in the preset transition region of the voltage zero crossing point, controlling a part of switch tubes in the secondary side bridge circuit to be switched on within the secondary side dead zone time, so that the secondary side bridge circuit and the secondary side of the transformer form a follow current loop. By means of the method, the power conversion circuit is not prone to generating current oscillation near the voltage zero crossing point, and therefore overstress damage of a secondary side switch tube can be avoided, and the current waveform can be optimized.

The invention belongs to the technical field of vehicle rearview mirrors, and particularly relates to a rearview mirror chip logic operation method and system with a retry function. Through a designed current detection circuit, a threshold detection circuit and a current comparison circuit, special customization of a rearview mirror folding driving chip is realized, and a rearview mirror driving motor tries to recover when being in a stuck state, so that normal operation of folding work is facilitated; meanwhile, a soft start-off circuit is designed, so that current impact during starting can be reduced, mechanical stress during starting can be reduced, system instability can be prevented, the situations of voltage spike and current sudden change when the motor is turned off are reduced, the motor and a driving circuit are protected, the reliability of the system is improved, the service life of the system is prolonged, and noise and vibration situations are reduced; and the condition of reverse current in the turn-off process of the motor is prevented.

The application discloses a lower limb auxiliary driving mechanism and a robot, which comprises a thigh assembly and a lower leg assembly connected with the thigh assembly, and a connecting end of a thigh connecting piece two and the lower leg assembly forms a knee joint. In the application, a constant force load mechanism is arranged on the thigh assembly, constant tension of a spring is converted into a compensation torque acting on the knee joint, so that the compensation torque can directly offset part or all of the bending moment generated by the weight of the lower limb on the knee joint, thereby realizing accurate compensation of the static load of the knee joint, reducing the driving burden when the joint maintains a posture, and the constant force load spring serves as a parallel auxiliary execution mechanism and jointly bears the load of the knee joint with a motor driving system. Through the parallel sharing mode, the joint load originally borne by the motor can be reasonably distributed, the motor works in a relatively stable and high-efficiency interval more, peak load is reduced, current impact is reduced, and overall driving efficiency is improved.

An energy storage system includes at least one energy storage unit cluster and a centralized monitoring system for the energy storage unit cluster. The energy storage unit cluster is composed of at least two energy storage modules connected in series. One energy storage module includes an energy storage element group and a switch bridge arm. The switch bridge arm is composed of a main control switch and a bypass switch. One end of the main control switch is connected to the energy storage element group, and the other end of the main control switch serves as the first input / output end of the energy storage module. One end of the bypass switch is connected to the first input / output end, and the other end of the bypass switch is connected to the second input / output end of the energy storage module. The energy storage unit cluster is coupled to a DC bus through a DC / DC converter. The centralized monitoring system is connected to the energy storage unit cluster through a control bus, and is used to control the conduction or disconnection of the main control switch and the bypass switch in any energy storage module in the energy storage unit cluster. The management flexibility of the energy storage system can be improved, the stability of the energy storage system can be improved, and the applicability is higher.

The invention relates to the technical field of power electronics, and discloses a dynamic voltage regulation method of a bidirectional DCDC converter, which comprises the following steps: step 1, establishing a data acquisition module, a data analysis module, an early warning module and a control module; step 2, taking the data analysis module as a calculation center, and calculating to obtain a current regulation index Wzl of the converter, a switch closing regulation index Pzr of the converter and a stability optimization coefficient Hzj of the converter; 3, an early warning module designs a preset threshold value of an index according to historical data of the converter, data calculated by the data analysis module is transmitted to the early warning module through a network to be compared with the preset threshold value, and when the threshold value is exceeded, a corresponding alarm signal is sent out; and 4, a troubleshooting module carries out converter troubleshooting according to preset threshold comparison information of the early warning module, and through the steps, unnecessary energy loss of the converter can be reduced, and the stability of the whole system can be enhanced while the working efficiency of the converter is improved.

An inverter parallel control system and control method based on improved droop control belongs to the research field of smooth switching of off-grid / grid-connected mode in low-voltage microgrid. The present invention includes a grid-connected pre-synchronization control unit, the voltage amplitude and phase of the microgrid output, the grid voltage amplitude and phase are controlled by PI to obtain the system voltage amplitude and frequency; an adaptive control unit, the system voltage amplitude and frequency and the voltage are adaptively corrected according to the droop coefficient of PI control; a virtual impedance unit, sampling current and virtual resistance to obtain a virtual voltage value, and the virtual voltage value and the reference voltage are used to obtain a new voltage reference value; the present invention realizes decoupling control and impact-free smooth grid connection, solves the problem of large voltage and frequency fluctuations when the grid-connected mode switches to the off-grid mode, and ensures that the microgrid system can operate stably.

This application discloses an image sensor, its readout method, and an electronic device, relating to the field of image sensor technology. The image sensor includes: a pixel array comprising multiple basic pixel units arranged in m rows and n columns; the pixel array is divided into an effective pixel area and an edge weakly photosensitive pixel area; wherein the edge weakly photosensitive pixel area includes at least a first row of basic pixel units and a first column of basic pixel units; the basic pixel units in the effective pixel area are used for photosensitive sensing and conversion into effective color pixel signals; the first row of basic pixel units and the first column of basic pixel units are configured with weak light-transmitting filters; the weak light-transmitting filters are blue filters or red filters; a control module electrically connected to the pixel array; capable of reducing signal bandwidth and reducing the requirements for the setup time and driving capability of the driving circuit.