806 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.

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 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 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.

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.

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.

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 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.

The present application belongs to the field of rail vehicle technology; provide a kind of rail vehicle emergency evacuation device's working circuit and control method, power supply unit in working circuit provides direct current voltage to vehicle zero speed response unit;Vehicle zero speed response unit responds to vehicle zero speed signal, and outputs direct current voltage to skirt interaction unit and folding ladder extension interaction unit;Skirt interaction unit and folding ladder extension interaction unit output voltage to door enable response unit, door enable response unit combines door enable signal input switch gating one side or two sides, and output voltage signal is given to drive response unit, drive the cylinder solenoid valve work.The control method of emergency evacuation device of the present application is suitable for the working circuit of emergency evacuation device of the present application.The present application provides vehicle zero speed response unit and door enable response unit, and control signal is provided to the driver side, can realize man-machine interaction, ensure that equipment is opened in correct side, guarantee the safety of vehicle, track and driver.

The invention relates to the technical field of direct-current electric welding machines, and one embodiment of the invention provides a safety type inverter direct-current electric welding machine for protective net production, the safety type inverter direct-current electric welding machine for protective net production comprises a first support, and a conveying roller is installed at the top of the first support; and a welding assembly is installed in the second support in a sliding mode, a supporting plate is installed on the inner wall of the second support, and a first motor is installed at the bottom of the inner wall of the second support. According to the device, the feeding assembly located on the front face of the second support is arranged, the longitudinal row steel wires with the specified size are fed into an inner cavity of the cutting groove, the second telescopic rod located on the inner wall of the top frame drives the cutter to downwards cut the longitudinal row steel wires located in the cutting groove, and the cut and formed longitudinal row steel wires directly enter the storage groove; and the second motor drives the roller to rotate, the longitudinally-arranged steel wires are rotationally conveyed into the communicating frame through the storage tank, the design keeps that the longitudinally-arranged steel wires can be continuously and stably conveyed, and the welding work efficiency of the device is effectively improved.

The invention relates to a mobile storage and charging all-in-one machine and an application method, the mobile storage and charging all-in-one machine comprises a storage and charging machine and a mobile station, the storage and charging machine is internally provided with an energy storage bin, an AC power distribution bin, a DC power distribution bin and an energy management system, and the energy storage bin is internally provided with a liquid-cooled battery pack; a PCS and an alternating current conversion device are arranged in the alternating current distribution bin, a power conversion unit and a direct current conversion device are arranged in the direct current distribution bin, a charging device is arranged on the outer wall of the direct current distribution bin, and the storage and charging machine is detachably installed on the moving table. The energy management system is in signal connection with the liquid-cooled battery pack, the PCS, the power conversion unit, the direct-current conversion equipment and the mobile station; the charging device outputs direct current outwards or receives an external direct current power supply to charge the liquid-cooled battery pack, and the alternating current conversion device outputs alternating current outwards or receives an external alternating current power supply to charge the liquid-cooled battery pack. The invention aims to provide the mobile storage and charging all-in-one machine which is low in cost, wide in application range, sufficient in electric energy, high in maneuverability, intelligent and capable of being remotely regulated and controlled and the application method.

A power source assembly (200, 300, 400) for an aeronautical vehicle (100), includes a fuel cell module (202, 302, 312, 402, 412) configured to provide a first direct current (DC) power output, a battery module (204, 304, 314, 404, 414) configured to provide a second DC power output, a DC electric bus (206, 306, 316, 406, 416) configured to provide a specified DC power output to a load (212, 324, 422), a multi-phase DC / DC converter including a plurality of converter units (214), the multi-phase DC / DC converter configured to receive the first DC power output from the fuel cell module (202, 302, 312, 402, 412) and the second DC power output from the battery module (204, 304, 314, 404, 414) and to provide the specified DC power output to the DC electric bus (206, 306, 316, 406, 416), and a controller (210, 310, 320, 410, 420, 600) operably coupled to the multi-phase DC / DC converter and configured to receive data (602D) indicative of the first DC power output, the controller (210, 310, 320, 410, 420, 600) configured to control the plurality of converter units (214) of the multi-phase DC / DC converter based on the data (602D) indicative of the first DC power output to maintain the specified DC power output to the load (212, 324, 422).

The invention discloses an insulation resistance measurement method, a measurement module and an anti-reverse power transmission isolation device, and relates to the field of operation and maintenance of distribution lines, and the key points of the technical scheme are as follows: a control voltage signal is generated according to the voltage demand of the insulation resistance of a test line sent by a user, and a PWM square wave signal with a duty ratio is generated according to the control voltage signal; performing high-frequency voltage transformation and voltage doubling rectification on the PWM square wave signal to obtain a direct-current voltage; calculating a current average value of the measurement loop when each resistance measurement gear is switched; presetting a current coefficient of each resistance measurement gear and weight coefficients of two adjacent resistance measurement gears; and when the current average value is greater than or equal to the product of the current coefficient and the weight coefficient, calculating the insulation resistance value of the measured circuit according to the current average value, the direct-current voltage and the resistance value corresponding to the resistance measurement gear.

The disclosure relates to a four-phase motor and generator device with increased efficiency for generating electrical energy. The device features a stator wall with eight stator slots and four pole groups, and an armature rotatable within the stator wall. The eight stator slots are divided into four pole groups of opposing stator slots; the two opposing stator slots include an N (North) stator slot and an S (South) stator slot. N and S stator slots are alternatively activated in response to the rotation of the armature. The activation of the armature pole groups results in armatures rotating the magnetic field within the stator wall, and only four of the eight poles are actively coupled in any given configuration. The disclosure also includes a method of operating the motor for generating electrical energy with increased efficiency and in an environmentally friendly manner compared to conventional motors.

Systems and methods for utilizing a small form-factor, wirelessly powered transceiver are disclosed. In one embodiment, a wireless powered transceiver includes a receive antenna configured to receive a receive signal, a transmit antenna configured to transmit a transmit signal, a power harvesting system including a rectifier circuit configured convert radio frequency energy from the receive signal into DC (direct current) voltage, and a power management unit (PMU) configured to set the operating mode and biasing condition of the receive and transmit circuitry blocks and provide DC voltage from the receive circuitry block to the transmit circuitry block to maintain a minimum voltage, a receiver circuitry block configured to provide energy from the receive signal to the power harvesting system, and a transmitter circuitry block including a data modulator circuit, the data modulator circuit configured to generate the transmit signal using DC voltage received from the power management unit.

The utility model discloses a power supply and a system used for nuclear fusion field anti-configuration. The power supply comprises a DC power supply, an inverter, a multi-output isolation transformer and N resonant branches. The direct-current power supply is electrically connected with the inverter; the inverter is used for converting the direct current into alternating current; the inverter is connected with the input end of the multi-output isolation transformer; and a plurality of output ends of the multi-output isolation transformer are respectively connected with one resonant branch. Structural improvement is carried out on the basis of a traditional field inversion configuration power supply technology, the charging function of capacitors of all branches of a coil is achieved through a transformer, all the branches are isolated from one another in the charging process, and mutual interference and influence are avoided; and meanwhile, the safety of other branches is not influenced when a single branch fails or is damaged in the working process.

Example systems and methods for charging multiple electric vehicles are described. In one implementation, a charger receives DC (direct current) power from at least one DC power source. A splitter is coupled to the charger and receives DC power from the charger. The splitter is capable of providing DC power to multiple electric vehicles. The splitter includes a switching matrix to deliver DC power from the charger to a first electric vehicle. The splitter also includes a control system that instructs the switching matrix to stop charging the first electric vehicle and begin charging a second electric vehicle based on at least one factor.

A motor driving device and a home appliance according to one embodiment disclosed herein comprises: a converter for converting input alternating current power into direct current power to output the direct current power; a direct current terminal capacitor for storing the direct current power; an inverter which includes a plurality of upper arm switching elements and lower arm switching elements connected in series, and converts the direct current power from the direct current terminal capacitor into alternating current power to drive a motor; a current detection unit disposed between the direct current terminal capacitor and the inverter; gate drivers for driving the switching elements included in the inverter; bootstrap capacitors which are charged in response to the lower arm switching elements being turned on and supply a driving voltage to the gate drivers of the upper arm switching elements; and a control unit for controlling the inverter on the basis of the current detected by the current detection unit, wherein the control unit first turns some of the plurality of lower arm switching elements on and off and then turns the other lower arm switching elements on and off before driving the motor.

The present invention relates to a DC and AC-compatible electric vehicle charging device and, more specifically, to an electric vehicle charging device for charging a battery of an electric vehicle using AC current of a power supply unit. The electric vehicle charging device comprises: an ESS for storing and outputting DC current; an ESS switching unit for charging the electric vehicle using the ESS or charging the ESS using the AC current of the power supply unit; a DC switching unit for charging a DC electric vehicle; and an AC switching unit for charging an AC electric vehicle, and thus can charge both DC electric vehicles and AC electric vehicles and can use the output of the ESS to charge an electric vehicle when power supply is not normal. The DC and AC-compatible electric vehicle charging device comprising the ESS according to the present invention for solving the technical problem may comprise: an AC-DC converter for converting the AC current of the power supply unit into DC current; a DC-AC converter for converting the DC current of the ESS into AC current; and a control unit for controlling the switching units.

The present invention provides an elevator energy-saving apparatus, connected in parallel to an elevator variable-frequency drive bus, and comprising: a battery pack, a battery management system (BMS), a power control system, a DC-DC direct current power supply, and a PLC controller, wherein the DC-DC direct current power supply is connected to the BMS and is connected in parallel to the elevator variable-frequency drive bus; the PLC controller is connected to the DC-DC direct current power supply; under the action of the PLC controller, the DC-DC direct current power supply changes a voltage inputted from the battery pack to a second preset voltage, so as to control the voltage of a high-voltage end to be at the second preset voltage; and under the action of a high and low voltage difference, when an elevator generates electricity, the voltage on the elevator variable-frequency drive bus does not rise to a first preset voltage, and a current automatically flows to the elevator energy-saving apparatus. The present invention has the characteristics of energy saving and high efficiency, reducing operating costs, stable operation, reducing the pressure of a power grid, and prolonging the service life of a device.

The invention discloses a direct-current direct-hanging type energy storage system test system and a method thereof. The system comprises a first device which is used for outputting different first voltages so as to simulate the operation characteristics of a DC power grid; wherein the first equipment comprises at least one first power module, which is used for providing the first voltage; the at least one first bypass switch corresponds to the first power module and is used for controlling the input state or the bypass state of the first power module; the second equipment is connected with the first equipment through a connecting inductor, and is used for testing the operation characteristics of the second equipment based on the first voltage to obtain an operation test result of the second equipment; wherein the second equipment comprises at least one second power module and at least one second bypass switch, and the second bypass switch corresponds to the second power module and is used for controlling the input state or the bypass state of the second power module.

The invention provides a motor control method and device of an air compressor, a vehicle and a storage medium, and the method is applied to the field of vehicles. The method comprises the steps that the current temperature of a motor is calculated based on the obtained direct-current voltage value of an air compressor controller at the target moment, the obtained water temperature value of a cooling water inlet of the air compressor controller, the obtained alternating current of the motor and the obtained rotating speed of the motor; and if the current temperature is greater than the allowable temperature of the motor, acquiring the current operation condition of the motor, and controlling the motor to operate in a power-reducing manner or stop operating according to a preset power-reducing strategy according to the current operation condition. According to the method, installation of a temperature sensor and lead-out wire harnesses and connectors is omitted, the temperature of the motor is calculated, a calculation result is transmitted to an FCU through a communication bus, and meanwhile a corresponding protection mechanism is executed according to a comparison result of the current temperature of the motor and the allowable temperature of the motor.

The application provides a combined movable multifunctional long-time emergency power supply, comprising a fuel engine for outputting high-frequency three-phase alternating current and a power output control system for controlling output current, wherein the power output control system comprises a rectifier and an inverter, an input end of the rectifier is connected with a power supply output end of the fuel engine, the rectifier inputs high-frequency three-phase alternating current input by the fuel engine after AC-DC conversion to a direct-current bus, a control end of the direct-current bus is bidirectionally communicated with a main controller, and the main controller monitors an instantaneous value of input current on the direct-current bus in real time and controls the direct-current bus to output corresponding direct-current to the inverter and a charge-discharge controller through electric signals respectively. The emergency power supply device of the application can adapt to various load demands: through modular design, different function modules can be flexibly replaced, so as to meet the power load demand of impact, electric vehicle charging, emergency long-time power supply and power grid connection and the power demand of various different scenes.

The invention discloses a power supply system for a magnetic suspension bearing controller. The power supply system comprises an alternating current / direct current voltage conversion unit, a switch control unit, a voltage selection unit, an energy storage unit, a motor, a rectification filtering unit and a direct current / direct current voltage conversion unit, the rectifying and filtering unit rectifies and filters alternating-current voltage output by the motor to generate second direct-current voltage, the direct-current / direct-current voltage conversion unit boosts or reduces the second direct-current voltage to generate third direct-current voltage, and the switch control unit controls on-off of branches where the rectifying and filtering unit and the direct-current / direct-current voltage conversion unit are located. According to the power supply system provided by the invention, natural seamless switching among three power supplies can be realized in the whole process of a magnetic suspension motor system from normal working to tripping power failure to the speed reduction of a rotor below a safe speed value and stopping on an auxiliary bearing, so that safe shutdown of a magnetic suspension motor under a power loss condition is ensured.

The application discloses a kind of based on DC pulse's enhanced toughening Ti-6Al-4V alloy and preparation method thereof.Method includes that hot working state Ti-6Al-4V alloy plate is cut into tensile specimen, after mechanical grinding, ultrasonic cleaning, constant temperature drying, by power connection DC pulse processing, by relay accurately control electric pulse action duration, by changing a series of electric pulse action duration and current density, obtain the enhanced toughening Ti-6Al-4V alloy under different DC pulse conditions, and obtain the comprehensive mechanical properties of Ti-6Al-4V tensile specimen.By the efficient DC pulse processing method provided by the application, the extremely short power cycle of microsecond level, and simple and convenient operation, significantly improve the yield strength, tensile strength and elongation of Ti-6Al-4V alloy.

The invention discloses a charging circuit, a vehicle, a charging system and a charging method, the charging circuit is applied to the vehicle, and the charging circuit comprises a first battery pack; the first direct current interface is used for being connected with an external power supply; the DC-DC converter is connected between the first battery pack and the first direct current interface, and the DC-DC converter is configured to convert a first direct current into a second direct current; wherein the first direct current is the direct current output by the first battery pack or the direct current input by the external power supply.

The utility model relates to a simple direct current connector, which comprises an upper connector, the upper connector comprises an upper connecting seat, a plugging cavity with an open bottom is arranged in the upper connecting seat, and a central pin, a first conductive metal ring and an isolating ring which are concentric but different in diameter are sequentially arranged in the plugging cavity from the center to the outside. A second conductive metal ring and a third conductive metal ring which are not higher than the isolating ring and the first conductive metal ring are respectively arranged on the inner side wall and the outer side wall of the isolating ring; the top surface of the upper connecting seat is provided with four groups of upper wiring terminal sheets which are respectively connected with the central pin, the first conductive metal ring, the second conductive metal ring and the third conductive metal ring, the connector can be used as a direct current connecting element, the size of the connector is small, the overall material consumption is reduced, the cost is lower, and the cost is reduced. Compared with other connectors, the connector has a price advantage.

A vegetation flame condition direct current gap multi-physical field coupling simulation method, determines the physical quantity required for simulation of charged particle motion, distribution and electric field distribution in the air gap under the condition of applying direct current voltage under the condition of typical vegetation flame, the connection between each physical field; determine the control equation of each physical field; determine the simulation method of multi-physical field coupling; determine the chemical reaction equation corresponding to the vegetation and the pyrolysis material coefficient; measure the vegetation flame temperature distribution and leakage current data by combustion test; compare the simulation obtained flame temperature distribution and leakage current with the test obtained temperature distribution and leakage current data, determine the vegetation pyrolysis reaction equation and chemical reaction rate parameter; simulation calculation obtains the charged particle concentration distribution characteristics and the space electric field distribution characteristics affected by the charged particles generated by the flame combustion. The present application can obtain the charged particle motion, distribution characteristics and electric field distortion of the direct current gap under the condition of typical vegetation flame.

The invention relates to the technical field of charging management, and discloses a wheel self-energized anti-overturning dynamic charging management device, which comprises a power generator rotating along with a wheel and converting mechanical energy into electric energy; the three-phase rectifier module is used for converting three-phase alternating current output by the generator into direct current; the voltage detection and overvoltage protection module is used for protecting and controlling the charging process; the DPM charging management module is used for dynamically adjusting the charging power; the servo module is used for carrying out auxiliary control on the working state of the generator; and the weighting block deflects in the power generation process, and the deflection state of the weighting block changes along with the change of the output power of the generator. A weighting block is used as a fixed end of a generator, so that the deflection attitude of the weighting block is associated with the output power of the generator, a DPM charging management module and a servo module are introduced for cooperative control, dynamic adjustment of the output power of the generator is realized, and an attitude-power linkage management mechanism under a wheel self-energized condition is constructed from the structure and control level.