17results about How to "Increase power level" patented technology

The invention relates to the technical field of diesel engine power control, in particular to a control method for reducing plateau power loss of a supercharged diesel engine through EGR. The working condition point of current operation is obtained through the engine rotating speed sensor and the accelerator position sensor, the electronic control unit corrects the main injection advance angle and the rail pressure according to the current altitude, and then the opening degree of the EGR valve is calculated and controlled according to the air amount demand value and the actual air inflow measured by the PFM air flow meter. When the altitude simulation test bench performs external characteristic tests under various altitudes, the main injection advance angle, the rail pressure and the air quantity demand quantity of the diesel engine are continuously debugged by combining the rotating speed of a diesel engine supercharger, the vortex front exhaust temperature and the smoke intensity value tested by the bench, and finally the EGR opening degree value and the external characteristic oil quantity value under the altitude condition are determined. And obtaining the maximum plateau power result under the altitude condition.

The invention discloses a control method, device and equipment for a three-level interleaving direct-current converter, and relates to the technical field of power electronics, and the method comprises the steps: determining a voltage-sharing control compensation value of a high-voltage side and a current-sharing control compensation value of each phase according to a control sampling parameter of an n-phase three-level interleaving direct-current converter; determining two modulation signals corresponding to each phase according to the voltage-sharing control compensation value and the current-sharing control compensation value of the high-voltage side; determining an upper unit switch tube driving signal and a lower unit switch tube driving signal of each phase in the n-phase three-level interleaved parallel DC converter according to two phase shift signals of each phase and two modulation signals of each phase corresponding to the input carrier signal, so as to control switch tubes in respective upper units and lower units of n three-level bridge arms in the converter; according to the invention, the non-voltage-sharing condition of the high-voltage side capacitor of the converter can be conveniently suppressed, the circulating current of the converter is suppressed, and the output current balance degree of each phase is improved, so that the precision and stability of the system are improved.

The invention discloses a high-power shaftless rim fan adopting an outer rotor motor, and relates to the technical field of fans, the high-power shaftless rim fan comprises a fan outer shell, a fan assembly, a cylindrical roller, a motor rotor, a motor stator and a fan air duct; a driving part of the fan adopts an outer rotor motor structure, fan blades of the fan are shaftless rim fans and are fixed on a rim structure, a main shaft structure of the fan blades is canceled, a motor rotor of the fan is mounted in a fan shell through a cylindrical roller, the fan shell serves as a bearing outer ring, the motor rotor serves as a bearing inner ring, and the fan shell serves as a bearing outer ring. The shell, the motor rotor and the cylindrical roller form a bearing structure, the rim fan blade assembly is connected with the motor rotor through a stud, and high integration of the fan is achieved. The inner circle of a stator of the fan is fixed to the fan air channel, and the fan air channel serves as a machine shell of the driving motor and a ventilation pipeline of the fan. According to the shaftless rim fan, the motor and the fan are integrated, the shaftless rim fan has the advantages of being compact in structure, flexible to control, convenient to arrange and the like, the fan blades are of a shaftless structure, air flow is smoother, and therefore the air flow efficiency is improved, energy waste is reduced, and the operation cost is saved.

A top cover, a throwing cavity and a middle cylinder are sequentially arranged from top to bottom, an air inlet is formed in the top cover, an air outlet is formed in the outer side wall of the middle cylinder, a temperature measuring hole is formed in the throwing cavity, and an observation window is formed in the outer side wall of the middle cylinder; the lower cylinder is arranged below the resonant cavity, and an annular antenna is arranged in the lower cylinder; the coaxial waveguide converter is connected with the lower cylinder and is a microwave transmission path; the deposition part is arranged at the bottom in the resonant cavity body; and the quartz part is arranged between the coaxial waveguide converter and the lower cylinder and is used for carrying out vacuum protection on the resonant cavity. The device can work under the condition of high microwave input power (6kw), can process a higher power level, realizes a more efficient diamond film deposition process, generates denser and more uniform plasmas, and further promotes the growth of the diamond film.

A single-phase four-level rectifying power supply based on a pseudo totem pole structure comprises eight full-control power switch tubes S1 to S8, diodes D1 to D6, inductors L1 and L2 and capacitors C1 to C3. One end of the alternating current power supply ug is connected with the anode of the diode D5 and the cathode of the diode D6 at an end point n; the other end of the AC power supply ug is connected with one end of an inductor L1 and one end of an inductor L2; the other end of the inductor L1 is respectively connected with the anode of the diode D1 and the drain electrode of the switch tube S1 at an end point a; the other end of the inductor L2 is connected with the cathode of the diode D2 and the source electrode of the switching tube S4 at the end point b. The cathode of the diode D1 is respectively connected with the drain electrode of the switching tube S3, the cathode of the diode D5, the anode of the capacitor C1 and the anode of the load RL at an end point p; the source electrode of the switching tube S2 is connected with the anode of the diode D2, the anode of the diode D6, the cathode of the capacitor C3 and the cathode of the load RL at an end point m. According to the rectifier, the pseudo totem pole rectification technology and the four-level topology technology are fused, so that the stress of a switch tube can be effectively reduced, the overall efficiency of a system is improved, and a bridge arm direct connection phenomenon does not exist.

The invention discloses a busbar and a converter, and belongs to the field of converters. The busbar comprises a bottom plate; the at least two first connecting ends are arranged on the bottom plate, and the at least two first connecting ends are used for being connected with the multiple bridge arms in a one-to-one correspondence mode; and the second connecting end is arranged on the bottom plate and is used for being connected with an external circuit. According to the busbar, the common end of the power device of the converter is connected through the busbar, wiring can be simplified, the through-current capability is effectively improved, large-area copper laying is not needed, and the heat dissipation capability of a circuit board, the power density of the converter and the capacity utilization rate of the power device in a converter circuit are improved.

This application discloses a multi-degree-of-freedom wave energy and wind energy co-harvesting and power generation device, relating to the field of marine renewable energy development technology. It solves the technical problems of high directional sensitivity, single energy capture dimension, and low energy density per unit area in existing marine energy harvesting devices. This device integrates wave horizontal kinetic energy, vertical potential energy, blade rotational energy, and offshore wind energy into one unit, achieving synergistic conversion through a hybrid mechanical and hydraulic transmission. This significantly improves the energy output rate per unit sea area and can respond to wave and wind energy in any 360° direction, breaking through directional limitations and making it suitable for various application scenarios in both offshore and nearshore areas.

This invention provides a three-phase single-stage multi-cavity parallel power conversion device, comprising: an AC / DC conversion circuit, the input port of which is connected to three-phase alternating current; the output port of the AC / DC conversion circuit including a first terminal, a second terminal, and a third terminal; and a DC / DC conversion circuit including at least three rectifier units, wherein the first input terminal of each rectifier unit is connected to the first terminal via a first switch, the first input terminal of each rectifier unit is connected to the second terminal via a second switch, and the first input terminal of each rectifier unit is connected to the third terminal via a third switch; the output ports of the plurality of rectifier units are connected in parallel. This invention enables power factor correction and output current or voltage regulation, improving the reliability, conversion efficiency, and power density of the power conversion device.

The embodiment of the invention provides a Buck-type switching power supply topological structure and a control method, the topological structure comprises a Buck-type switching circuit, the Buck-type switching circuit comprises at least one phase of Buck-type switching sub-circuit, the output voltage of any phase of Buck-type switching sub-circuit is connected with a first power MOS tube, the first power MOS tube is connected with a second power MOS tube and a first energy storage inductor, and the second power MOS tube is connected with a second energy storage inductor. The first energy storage inductor is connected with a first output capacitor and a first output load, and the first output capacitor is connected with the first output load in parallel; and the main control chip is used for outputting a control signal for controlling the Buck type switching circuit based on the received sampling value of the Buck type switching circuit. According to the embodiment of the invention, the conduction loss of the diode can be reduced, and the working efficiency of the Buck-type switching power supply is improved.

This application relates to the field of switching power supply technology and discloses a gallium nitride (GaN) charger based on a 494 PWM chip. The charger includes a power board, a rectifier circuit module, a half-bridge GaN driver module, a transformer, a 494 chip control module, a totem-pole driver module, an isolation driver transformer, a full-wave rectifier module, a filter circuit module, and a conversion circuit module. The core of this application is that the 494 chip control module generates a PWM signal, which is then amplified by the totem-pole driver module and electrically isolated and coupled by the isolation driver transformer before driving two GaN transistors in the half-bridge topology to switch alternately at high frequency. This application fully utilizes the high-speed switching characteristics of GaN devices, enabling the charger to operate at higher frequencies. This increases the power level to the kilowatt level while reducing switching losses and the size of magnetic components, achieving high power density and high overall conversion efficiency.

The application discloses a kind of control strategy determination method, device and electronic equipment of power distribution system.Therein, the method comprises: receiving and responding to the splitting event signal of power distribution system, obtaining the full amount operating state information corresponding to power distribution system;According to full amount operating state information, the on-off state of controllable line is combined, and power distribution system is divided into multiple initial island sets;According to local operating state information, a multi-agent dynamic frequency response model is constructed;Solving multi-agent dynamic frequency response model, according to the initial total loss value and initial control strategy corresponding to the multiple initial island sets respectively, the updated island set is obtained by updating, and the loss value and control strategy operation are determined iteratively until the target condition, to obtain the target control strategy corresponding to the target island set.The application solves the technical problem that the strategy loss is high when determining the control strategy corresponding to multiple island systems in the related art under the splitting condition.

The invention belongs to the technical field of electric energy conversion, and aims to provide a combined non-isolated three-phase inverter, an isolated island operation control method and system, electronic equipment and a product. According to the combined non-isolated three-phase inverter, generation of common-mode current can be reduced, the use of a transformer is omitted by configuring the three single-phase Helic inverters, and compared with a traditional combined three-phase inverter, the equipment cost is reduced. According to the island operation control method, an updated active-frequency equation is constructed based on a hyperbolic tangent function, and due to the fact that the hyperbolic tangent function is provided with an upper boundary and a lower boundary, according to the characteristic, the frequency can be limited to change within a specified range, and the control accuracy is improved. In other words, no matter how the load and the output power change, the frequency does not exceed the preset range, and therefore the frequency out-of-limit problem which cannot be solved by traditional droop control is solved.

The invention discloses a high-gain DC-DC converter modulated by an energy storage element, and belongs to the technical field of power management. According to the high-gain boost converter, high-voltage gain is achieved through charging and discharging of the inductor and the capacitor, the number of used capacitors is small, and the reliability of the high-gain boost converter is improved; the stress of the switching device in the embodiment is low under a relatively large duty ratio, and the voltage gain can be improved by utilizing the duty ratio; the driving signals of the two switching tubes are synchronous, so that the control circuit is simpler to realize; the structure is simple, and the total number of used devices is smaller; after the converter is expanded to be multi-phase, the power level of the converter is further improved, and after the switched capacitor of the converter is expanded to be n-order, the voltage of the converter is further improved.

The utility model belongs to the technical field of heat dissipation, and particularly relates to a heat dissipation device and electrical equipment, which are used for heat dissipation of a module to be subjected to heat dissipation and comprise a surface heat pipe, a middle layer heat pipe, a heat dissipation substrate and heat dissipation fins. The heat dissipation substrate is provided with a first surface and a second surface which are opposite to each other; the surface heat pipe is arranged on the first surface of the heat dissipation substrate, the module to be cooled is arranged on the first surface of the heat dissipation substrate, and the module to be cooled is in contact with the surface heat pipe; the middle layer heat pipe is embedded in the heat dissipation substrate; and the radiating fins are connected to the second surface of the radiating substrate. Compared with the prior art, the heat pipe radiator solves the problems that in the prior art, a heat pipe radiator is poor in temperature equalization characteristic and cannot fully utilize the arrangement of the heat conduction area of the heat dissipation substrate, the heat pipes are inserted in the heat dissipation substrate to assist heat transfer, and the temperature equalization characteristic and the heat dissipation effect of the heat dissipation substrate are improved.

The application belongs to the technical field of electric power, and proposes a rectifier based on a bridgeless AC-DC auxiliary converter and a control method. In the application, the rectifier is composed of a main power converter and a bridgeless AC-DC auxiliary converter, and the two are connected in parallel and operate in parallel. The main power converter adopts a thyristor rectifier to provide main power support for an electrolysis stack. The bridgeless AC-DC auxiliary converter includes low-pass filters, IGBTs, high-frequency transformers, diode rectifiers and other elements. A control unit and a driving unit are responsible for controlling the operation of the rectifier. Through the control algorithm of the sampling circuit and the central processing unit, the output current and the input current of the rectifier can be accurately controlled and compensated, thereby reducing the content of ripples and harmonics in the rectifier. The rectifier and the control method proposed in the application can make the grid-side current distortion small.

The invention discloses a solar array regulator which comprises k stages of power units sequentially controlled by a hysteresis comparator, the input ends of the k stages of power units are connected to a solar array section, and the output ends of the k stages of power units are connected to an HV-BUS high-voltage bus and a main error amplification circuit in parallel. The power unit comprises a shunting part, a DCX push-pull part and a hysteresis comparator, the hysteresis comparator receives a signal of the main error amplification circuit, the DCX push-pull part is used for amplifying an input voltage in an equal proportion according to the turn ratio of a transformer, and control is carried out through the shunting part, the hysteresis comparator and the main error amplification circuit. According to the invention, the SADA can be ensured not to generate high voltage, the power supply safety of the whole satellite is protected, and the power density of the PCU is improved.

The invention discloses a wireless charging system capable of realizing constant current-constant voltage and power expansion, and relates to the field of wireless charging. The invention aims to solve the problems that in the whole charging process of a battery, the equivalent resistance change of the battery is large, and constant-current and constant-voltage output is difficult to realize. In the constant-current charging mode, the double receivers can effectively share energy transmitted by the transmitter, the current stress of the diode on each receiver is reduced, and finally, the double receivers output in parallel, so that the output current is increased, the power level is improved, and zero-voltage switching can be realized. In a constant-voltage charging mode, only one receiver serves as output, the other receiver serves as compensation of the output side coil, a zero phase angle can be achieved, and the power transmission capacity is improved.