1533 results about "DC - Direct current" patented technology

The invention discloses a wind-solar complementary energy storage direct current charging method and system based on liquid cooling heat dissipation, and relates to the technical field of energy storage charging. Comprising the following steps: S1, collecting wind-solar complementary energy storage data in real time, and carrying out data preprocessing; s2, converting wind-solar power generation into direct current, judging the flow direction of wind-solar power generation energy, and performing corresponding wind-solar power generation energy transmission power supply; s3, judging the limit of the output power of the charging pile, and controlling and adjusting the output of the charging pile in stages; s4, quantifying the liquid cooling flow required by heat dissipation, and performing heat source heat dissipation on the energy storage system and the charging pile; and S5, carrying out coordinated regulation and control, strategy optimization and multi-dimensional visualization on the flow direction of wind and light power generation energy, charging pile output and heat source heat dissipation. The problems that an existing charging station is difficult to deploy in remote and power transmission difficult areas, high-power charging heat dissipation and energy efficiency bottlenecks are prominent, and the efficiency of traditional air cooling and alternating current conversion is low, so that efficient, safe and green energy supplementation is difficult to achieve are solved.

Presented are high-voltage (HV) electrical system architectures for vehicle-to-vehicle (V2V) charging of vehicle batteries, methods for making / using such systems, and vehicles equipped with such systems. An HV electrical system for a motor vehicle includes a main HV bus that electrically connects the vehicle's traction motor(s) to the vehicle's battery pack(s), and a charging inlet port that electrically mates with and receives direct-current (DC) power from DC fast-charging (DCFC) cables of a donor vehicle and a charging station. A DC-to-DC (DC-DC) converter is interposed between and electrically connects the charging inlet port to the main HV bus. The DC-DC converter is operable in a bypass mode, in which the DC-DC converter passes therethrough DC power received from the DCFC cable of the charging station, and a vehicle-to-vehicle (V2V) mode, in which the DC-DC converter modulates DC power received from the DCFC cable of the donor vehicle.

The invention discloses an anti-fouling piezoelectric ceramic membrane which comprises a support body, a coil and a piezoelectric ceramic separation layer, the support body is made of porous ceramic with a through hole in the middle; the coil is a closed loop composed of a lead coil and a crystal oscillator; the piezoelectric separation layer is coated on the inner wall of the through hole of the support body; and the coil is arranged between the support body and the piezoelectric ceramic separation layer. When a medium containing electrolyte passes through a membrane hole, the coil generates induction direct current, the direct current is converted into positive wave pulse current through the oscillator, the wound and overlapped piezoelectric ceramic membrane separation layer is excited, ultrasonic vibration is generated, and therefore the membrane dirt blocking condition is reduced, the use efficiency of the ceramic membrane is improved, and the maintenance and use cost is reduced.

There is provided be a brushless direct current, BLDC, electric motor. The BLDC electric motor comprises a rotor comprising a rotor shaft and a stator arranged around the rotor shaft. The stator comprises a stator hub comprising electromagnets, and cooling channels extending in a direction that is parallel to a longitudinal direction of the rotor shaft and the cooling channels are positioned between the rotor shaft and the electromagnets.

The invention relates to a direct current motor with an anti-electromagnetic interference structure in the field of motors, which is characterized in that the surfaces of a commutator and an electric brush are blown in real time through a magnetic shielding cylinder arranged on the outer side of the commutator and an air blowing blade arranged in the magnetic shielding cylinder, and carbon powder on the surfaces of the commutator and the electric brush is cleaned; the commutator and the electric brush are subjected to synchronous blowing heat dissipation, so that the commutator and the electric brush have relatively good contact stability, the condition of contact resistance increase caused by carbon powder accumulation is reduced, the probability of arc generation between the commutator and the electric brush is reduced, and the electromagnetic compatibility of the motor is further improved; the influence of a high-frequency magnetic field generated by the arc on a rotor winding coil is reduced, and electromagnetic interference is further reduced; in addition, the insulating groove formed in the commutator improves the collecting and cleaning effects of the carbon powder, and the insulating groove is matched with the diversion disc to realize ejection of the lower contact surface of the electric brush, so that the cleaning effect of the carbon powder is further improved.

The invention belongs to the technical field of industrial control, and particularly relates to a brushless direct current motor high-efficiency control method and system based on an FOC algorithm, and the method comprises the steps: superposing high-frequency sine disturbance in a voltage instruction, extracting a response component, achieving the online identification of the equivalent impedance of a motor, and dynamically solving and updating the estimated values of resistance and inductance; and correcting d-axis and q-axis voltage feed-forward items in real time by using the updated parameters, and correspondingly adjusting a current loop proportion and an integral gain. The method can adapt to the time-varying characteristics of motor parameters in an industrial field, so that the accuracy of feed-forward compensation and the stability of current loop bandwidth are effectively guaranteed, and the robustness and the control precision of a control system under complicated industrial working conditions such as variable temperature and variable load are remarkably improved; and the requirements of high-end industrial equipment on high performance and high reliability of the motor driving system are met.

A direct-current conversion circuit, which is used for providing direct-current conversion between a first direct-current voltage and a second direct-current voltage is described. The direct-current conversion circuit comprises: a transformer, which comprises a primary-side winding and a secondary-side winding, wherein the primary-side winding comprises a center tap, and a first primary-side winding and a second primary-side winding, which are respectively connected to the center tap; a primary-side circuit, wherein a first side of the primary-side circuit is connected to the primary-side winding, a second side of the primary-side circuit comprises a first end, a second end, and a third end, and a first direct-current voltage is provided between the first end and the second end of the primary-side circuit; and a secondary-side circuit, wherein a first side of the secondary-side circuit is connected to the secondary side winding.

The invention belongs to the technical field of direct current monitoring, and discloses a TMR-based open-close type direct current leakage current detection device, which comprises a magnetic core, one or more pairs of TMR sensors, a secondary side feedback coil and a main control circuit, and is characterized in that the magnetic core is provided with air gaps which are oppositely arranged; the TMR sensors are symmetrically arranged in the air gap; the secondary side feedback coil is wound on the surface of the magnetic core and forms closed-loop control with the main control circuit; the main control circuit comprises an acquisition feedback circuit, a secondary side detection circuit and a main control chip, the acquisition feedback circuit acquires signals of the TMR sensor under the control of the main control chip, generates feedback current and inputs the feedback current to the secondary side feedback coil, and the secondary side detection circuit is connected between the secondary side feedback coil and the main control chip. And the main control chip collects the secondary side voltage of the secondary side detection circuit and calculates to obtain the direct current leakage current. According to the invention, direct current leakage current detection with high sensitivity, low drift and strong anti-interference capability is realized under the open-close structure, and the requirements of a modern electric power system on continuity, safety and maintainability are met.

A road construction machine in the form of a road paver or a feeder vehicle for conveying paving material to a road paver, the road construction machine being self-propelled and having a primary drive source, a hopper, at least one working unit and at least one electric consumer for heating the working unit, the road construction machine having an energy supply system with at least one electrical energy storage which can be charged by means of electric current generated outside the road construction machine and is present on the road construction machine as an internal power source for direct current supply to the electric consumer. Furthermore, the disclosure relates to the use of such an energy storage for direct current supply to an electric consumer of a road construction machine.

The invention discloses a battery charging and discharging power self-regulation control circuit, which relates to the technical field of battery control, and comprises a power supply module, a micro-control module, a voltage sampling and comparison module, a battery charging and discharging power self-regulation control module, a battery charging and discharging power self-regulation control module, a battery charging and discharging power self-regulation control module and a battery charging and discharging power self-regulation control module, the power regulation module compensates the direct-current electric energy, the battery module stores energy, the power regulation module and the direct-current electric energy are superposed and supply power to the battery module, during the discharging period, according to the voltage comparison condition, the power regulation module carries out voltage compensation processing on the battery module, and the battery module directly supplies power to the discharging module; and the power regulation module performs voltage balance control on the battery module. The battery charging and discharging power self-adjusting control circuit can prolong the service life of the battery, improve the charging and discharging efficiency, reduce the electric energy loss of the power adjusting module, improve the energy utilization rate and provide higher charging voltage.

The invention relates to the technical field of motor control, and provides a control method, system and device of a brushless direct current motor for a diaphragm pump, and the method comprises the steps: obtaining a plurality of first weight coefficients of different dimensions of diaphragm pump features and corresponding first compatibility scores; obtaining second weight coefficients of the brushless direct current motor characteristics of multiple different dimensions and corresponding second compatibility scores; acquiring system compatibility according to the first weight coefficient, the first compatibility score, the second weight coefficient and the second compatibility score; based on the system compatibility, the control strategy is dynamically adjusted, and the brushless direct current motor for the diaphragm pump is controlled. According to the method, the multi-dimensional characteristic elements of the diaphragm pump and the brushless direct current motor are comprehensively considered, the control strategy can be dynamically adjusted and optimized based on the system compatibility, the brushless direct current motor control is well matched with the system, and therefore the control reliability of the brushless direct current motor for the diaphragm pump is improved.

The invention relates to an electric engine, a power device and an aircraft, and belongs to the technical field of aircraft power equipment.The electric engine comprises a power motor and a liquid cooling flow path arranged in the power motor and comprises a stator support; the heat dissipation system comprises a fan, a radiator and a heat dissipation motor, an outlet of the radiator is connected with an inlet of the liquid cooling flow path, an inlet of the radiator is communicated with an outlet of the liquid cooling flow path, and the fan is used for cooling the radiator and / or the power motor; the motor rear cover is fixedly connected with the stator bracket; and the two direct-current converters are both mounted on the motor rear cover and are both electrically connected with the heat dissipation motor. The two direct-current converters convert high-voltage direct current accessed by the electric engine into low-voltage direct current capable of being used by the heat dissipation motor, and the electricity utilization requirement of the heat dissipation motor is met. Due to the redundancy design of the two direct-current converters, when one path of low-voltage power supply breaks down, the other path of low-voltage power supply can still supply power to the heat dissipation motor in a low-voltage mode, and enough fault handling time can be provided for the whole power supply system.

The invention discloses a DC-output offshore wind and light new energy collection system and a control method thereof, which are applied to the technical field of power grids, and the system comprises a DC bus, a DC-DC converter, a DC line, an inverter, an offshore converter station, an AC power grid, a plurality of DC transmission units and a plurality of new energy power generation units. The output end of each new energy power generation unit is connected in series with each direct current transmission unit; the direct current transmission units transmit electric energy to the direct current-direct current converter through the direct current bus, and the direct current bus is connected with the direct current transmission units in parallel; the output end of the DC-DC converter transmits electric energy to the receiving end of the inverter through the DC line; the inverter transmits electric energy to the alternating current power grid through the offshore converter station. According to the system and the method provided by the embodiment of the invention, the power of the power grid can be controlled, and the stability of the system is ensured.

The invention discloses a DC motor fault diagnosis method based on improved local mean decomposition and composite multi-scale bubble entropy fusion, and relates to the technical field of motor fault diagnosis. In order to solve the technical defect of insufficient fault feature extraction of the existing motor fault diagnosis technology in the prior art, the technical scheme provided by the invention comprises the following steps: collecting a sound signal in a running state of a direct current motor as an original signal; decomposing the original signal by adopting an improved local mean decomposition method to obtain a plurality of product components, and screening out effective feature components with high correlation with the original signal; performing composite multi-scale bubble entropy calculation on the effective feature component, and extracting a multi-dimensional entropy feature vector representing signal complexity; and inputting the multi-dimensional entropy feature vector into a particle swarm optimization extreme learning machine model for classification so as to obtain a fault diagnosis result of the DC motor. The method can be widely applied to real-time monitoring and intelligent fault identification of the running state of the direct-current motor in industrial production.

A control system for pre-conditioning a refuse vehicle includes processing circuitry. The processing circuitry is configured to obtain a scheduled deployment time of the refuse vehicle. The processing circuitry is also configured to perform a first pre-conditioning operation by operating a charging system to charge batteries of the refuse vehicle at a first charge rate over a first time interval, and a second charge rate over a second time interval to fully charge the batteries by the scheduled deployment time. The charging system is configured to provide direct current (DC) electrical energy to the batteries for charging. The processing circuitry is also configured to perform multiple other pre-conditioning operations at least partially simultaneously with performing the first pre-conditioning operation.

A fault detection system for detecting a fault condition in a direct current (DC) system. The system may include a transmitter including a DC source to energize a cable and a receiver connected to the cable and including a signal generator to generate a periodic signal. The transmitter may include a termination impedance matched to the characteristic impedance of the cable to absorb substantially all the periodic signal. The transmitter may include a fault detection circuit coupled to the cable to detect changes in the frequency response of the cable by tracking changes in the envelope of the power of the periodic signal and outputting a fault signal if the rate-of-change of the envelope of the power of the period signal exceeds a threshold level.

The present disclosure relates to circuits for connecting components of a hydrogen plant to a power grid to power the components in an efficient manner. In one implementation, power-side alternate current (AC) to direct current (DC) converters may be connected to a source power grid without the need for an isolation transformer by providing separate buses between the power-side AC-DC converters and load-side DC-DC converters instead of a shared DC bus between the converters. Other implementations for connecting components of a hydrogen plant to a power grid may include an adjustable transformer, such as a tappable transformer or an autotransformer, to connect any number of auxiliary loads of the plant to the power grid. The adjustable transformer may provide for various types of auxiliary load devices to connect to the power provided by the transformer at the same time, including both three-phase devices and one-phase devices.

The embodiment of the invention discloses a brushless direct current motor control system, and the system comprises a communication module which is used for receiving a control instruction; the detection module is used for collecting state information of the brushless direct current motor in real time; the control module is electrically connected with the communication module and the detection module and is used for executing a field-oriented control algorithm in a fixed-point operation mode based on the control instruction and the state information of the brushless direct current motor so as to generate a motor driving signal; and the driving module is connected with the control module and is used for receiving the motor driving signal and driving the brushless direct current motor to operate. According to the brushless direct current motor control system provided by the embodiment of the invention, hardware operation load is simplified through fixed-point operation, a low-cost embedded processor is adapted, and the problem that a field-oriented control algorithm on a low-cost hardware platform is difficult to consider both operation efficiency and control precision is solved.

The utility model provides a charger, and belongs to the technical field of power supplies. The charger comprises a first circuit board, a second circuit board and an electric connecting piece, signal transmission is carried out between the first circuit board and the second circuit board through the electric connecting piece, a transformer is arranged on the first circuit board, a secondary winding of the transformer is connected with a corresponding terminal of the electric connecting piece, and a secondary winding of the transformer is connected with a corresponding terminal of the electric connecting piece. The second circuit board is provided with a secondary side output circuit, the input end of the secondary side output circuit is connected with the secondary winding through a corresponding terminal of the electric connecting piece, and the output end of the secondary side output circuit is connected with a charging end. And the secondary side output circuit is used for rectifying the voltage output by the secondary winding into direct-current voltage and outputting the direct-current voltage to the charging end. The charger is small in size and convenient to carry.

The invention discloses a dynamic power management method for an all-electric ship hybrid energy storage system. The method comprises the following steps: S1, establishing a direct-current voltage dynamic model and a ship hybrid energy storage system model based on a ship micro-grid structure of a ship; s2, establishing a multi-working-condition propulsion power model based on the movement mechanism of the ship; s3, establishing a joint SOC-SOP estimation model based on the nonlinear relationship among the state of charge, the battery power characteristics and the ambient temperature; s4, on the basis of the direct-current voltage dynamic model, the ship hybrid energy storage system model and the multi-working-condition propulsion power model, establishing a dynamic power distribution model; and S5, estimating an available power range of the battery through a combined SOC-SOP estimation model, inputting the available power range into the dynamic power distribution model, obtaining a dynamic power distribution strategy, and realizing dynamic power distribution of the ship hybrid energy storage system. According to the method, the dynamic power management of the hybrid energy storage system of the all-electric ship under the uncertain navigation condition is optimized, and the stability and the economical efficiency of a ship power system are improved.

Described herein is an electric vehicle charging arrangement for charging an electric vehicle. The electric vehicle charging arrangement includes: an electric vehicle charger configured for providing a direct current (DC) to the electric vehicle, a power cabinet configured for providing a DC to the electric vehicle charger, and a direct current bus arranged between the power cabinet and the electric vehicle charger and configured to transport the DC from the power cabinet to the electric vehicle charger, where a capacitive filter is installed on the DC bus and in the electric vehicle charger.

The invention discloses a cable metal shielding layer fault live detection constant current source, which belongs to the technical field of live line fault diagnosis, and comprises an output end used for injecting adjustable direct current into a live cable; the primary protection module is used for inhibiting interference signals generated by a metal shielding layer of the live cable; the sampling module is used for collecting the output current of the output end after the interference signal is suppressed by the primary protection module; the secondary protection module is used for filtering the residual interference signal of the output current of the output end after the interference signal is suppressed by the primary protection module; the microcontroller unit is used for controlling the starting state of the secondary protection module according to the amplitude of the residual interference signal; the duty ratio adjusting module is used for dynamically adjusting the duty ratio of the pulse width modulation signal according to the output current of the output end; and the DC-DC converter is used for controlling and adjusting the output current of the output end according to the pulse width modulation signal. The constant current source can realize cable metal shielding layer fault live-line detection.

The present invention discloses a central gateway, an in-vehicle communication system, and a vehicle, wherein the central gateway is configured to be connected between a DC power supply module and at least one zone control device, and the central gateway comprises: a power supply control module, wherein the power supply control module is connected on one side to a first power supply cable, wherein the first power supply cable serves to connect to the DC power supply module, and wherein the power supply control module is connected on the other side to at least one second power supply cable, wherein the second power supply cable serves to connect to the zone control device, and wherein the power supply control module is configured to transmit the DC power provided by the DC power supply module to the zone control device via the second power supply cable,wherein the second power supply cable comprises a section for transmitting direct current and a combined cable section transmitting both communication signals and direct current; a low-pass filter arranged between the power supply cable section and the combined cable section within the same power supply control module.

The invention relates to the technical field of power transmission systems, and discloses a direct-current power transmission system commutation failure suppression method, system and device and a medium. The method is applied to a direct current transmission system equipped with VDCOL control, and comprises the following steps: measuring a rectification side direct current value, and obtaining a rectification side direct current change rate based on the rectification side direct current value; determining a receiving end AC system operation state based on the rectification side DC current change rate; when the operation state of the receiving end alternating current system is an unsteady state, an inverse compensation voltage is obtained based on the direct current change rate of the rectification side, and the inverse compensation voltage is configured to be a regulating variable of dynamic compensation VDCOL control input; and performing dynamic correction on the rectification side current instruction based on the back compensation voltage to obtain a current limiting instruction, and suppressing inversion side commutation failure according to the current limiting instruction. According to the invention, a complete control link from current change rate detection to commutation failure suppression is constructed, and the operation stability and reliability of the DC power transmission system under complex working conditions are improved.

A kind of method for melting pole twisted wire arc magnetic spin control welding.The prior art twisted wire welding is prone to produce blowhole in weld inside when large current welding, and excessive heat input will cause changes in structure and performance in joint area, such as problems of weld zone grain growth, joint plasticity, toughness and other mechanical properties decline, etc.The present application comprises: twisted wire welding electrode arc welding point, a coaxial coil is arranged around the twisted wire welding electrode arc welding point, direct current is passed into the coaxial coil to form longitudinal magnetic field, the force direction of longitudinal magnetic field on twisted wire welding arc should be consistent with the self-rotating direction of twisted wire welding arc, and opposite to the twisting direction of twisted wire, the direction of longitudinal magnetic field is controlled by the direction of direct current, while twisted wire melts to form its own twist angle release, the twist angle release is affected by Lorentz force to make the rotational angular velocity of twisted wire welding arc rapidly increase, to realize high-speed directional rotation of twisted wire welding arc.The present application is used for melting pole twisted wire arc magnetic spin control welding method.

The invention discloses a preparation and application method of a modified ion exchange membrane for electrodialysis, aiming at the problems of poor selectivity, low mechanical strength, high energy consumption and the like of the existing ion exchange membrane, the high-performance modified membrane is prepared by a base membrane pretreatment-functional grafting-gradient curing synergistic process. The preparation method specifically comprises the following steps: performing ultrasonic cleaning and acid-base activation on a polyethersulfone or sulfonated polystyrene-based membrane, soaking the polyethersulfone or sulfonated polystyrene-based membrane in a modification solution containing an amino / carboxyl / sulfo functional monomer, a cross-linking agent and an initiator, and performing gradient heating curing to form a stable cross-linked network; the grafting rate of the modified membrane is 15-35%, the ion exchange capacity is 1.8-2.5 mmol / g, the water content is 25-40%, and the membrane surface resistance is less than 3 omega.cm < 2 >. When the membrane is applied to an electrodialysis device, the membrane runs under the conditions of 10-30V direct-current voltage, 5-15cm / s flow velocity and 25-45 DEG C, the high-salinity wastewater desalination rate is greater than or equal to 95%, and the monovalent ion selectivity coefficient reaches 5.8-7.2; when the catalyst is used for acid-base recovery, the H < + > migration number is 0.92-0.96, and the energy consumption is reduced by 18-25%.

The invention discloses a hydrogen-rich water generating device, and relates to the technical field of water treatment, the hydrogen-rich water generating device comprises a base and a support frame fixedly connected to the upper surface of the base; and the electrolysis mechanism is used for decomposing water into oxygen and hydrogen under the action of direct current, through the arrangement of the electrolysis mechanism, water flow in the electrolysis mechanism can be electrolyzed when the electrolysis mechanism works and is connected to a power source, and the principle is that the water is decomposed into the hydrogen and the oxygen through the direct current. In the electrolysis process, the cathode is subjected to a reduction reaction to generate hydrogen, the anode is subjected to an oxidation reaction to generate oxygen, and the total reaction is that water is decomposed into hydrogen and oxygen; the separation mechanism is used for shunting oxygen and hydrogen electrolyzed by the electrolysis mechanism, and the connecting frame is fixedly connected to the outer side face of the separation mechanism. And the effect of producing hydrogen-rich water by utilizing the electrolysis principle to produce hydrogen is achieved.

The invention discloses a control device and method of an air conditioner, equipment and a storage medium. The control device comprises a controller, a rectifying circuit, a switching power supply circuit and a first energy storage unit, and the controller is used for controlling at least one valve body to act and supplying power to the at least one valve body; the rectified power is used for rectifying an external power supply into direct current; the switching power supply circuit is used for converting the direct current output by the rectifying circuit and then supplying power to the controller; the first energy storage unit is arranged at the output end of the rectifying circuit, connected with the power supply end of the switching power supply circuit and used for storing the electric energy output by the rectifying circuit and supplying power to the switching power supply circuit when the external power supply is powered off. Under the condition that the external power supply is suddenly powered off, the first energy storage unit supplies power to the switching power supply circuit, the controller continues to work, the valve body can be controlled to be completely closed, and the safety and reliability of the air conditioner are improved.

The invention relates to the technical field of agricultural machinery, in particular to a full-electric drive grain harvester. The full-electric drive grain harvester comprises a diesel generating set, an electric control cabinet, a plurality of frequency converters, a plurality of drive motors and a plurality of loads. The plurality of frequency converters, the plurality of driving motors and the plurality of loads are in one-to-one correspondence; the electric control cabinet receives alternating current output by the diesel generating set, converts the alternating current into direct current and distributes the direct current to the frequency converters. The frequency converter receives the direct current distributed by the electric control cabinet, converts the direct current into variable-frequency alternating current and outputs the variable-frequency alternating current to the corresponding driving motor; and the driving motor receives the variable-frequency alternating current output by the frequency converter and controls the corresponding load to act. The full-electric drive grain harvester solves the problems that a traditional grain combine harvester is low in transmission efficiency, poor in system reliability, high in failure rate, poor in energy-saving effect, large in pollutant emission, large in vibration and large in equipment noise.

The invention discloses a brushless direct current motor fault diagnosis method and system based on multi-source information fusion, and relates to the technical field of motor fault diagnosis, and the method comprises the following steps: synchronously collecting multi-source data during the operation of a brushless direct current motor; preprocessing the collected multi-source data, and extracting feature vectors from the preprocessed data; constructing a multi-modal feature adaptive weighted fusion algorithm to process the feature vector, and calculating a comprehensive health index; constructing an improved residual attention classification network, and inputting the feature vectors into the network for fault classification and positioning; calculating a fault severity index based on the comprehensive health index and a fault classification result; and outputting a diagnosis result containing the comprehensive health index, the fault type, the fault position and the fault severity index. By fusing multi-source information such as electrical characteristics, thermodynamic characteristics and control signals, diagnosis, classification and positioning of various faults of the brushless direct current motor are realized.