971 results about "High power density" patented technology

The invention relates to the technical field of chip heat dissipation, and provides an immersed heat dissipation system with liquid nitrogen as a cooling medium and an integrated circuit assembly. In an immersed heat dissipation system with liquid nitrogen as a cooling medium, huge heat generated by a high-power-density chip under an extreme working condition can be efficiently absorbed and taken away under the extremely low working temperature and the large phase change heat absorption capacity, the heat transfer limit of a traditional cooling technology is broken through, and deep cooling of the chip is achieved; meanwhile, the liquid nitrogen is non-conductive and stable in chemical property, the electrical short circuit risk and physical and chemical corrosion problems caused by leakage of the cooling working medium are thoroughly eliminated, and the long-term operation reliability and safety of the immersed heat dissipation system with the liquid nitrogen as the cooling medium are remarkably improved. Therefore, stable operation of the chip under high load is guaranteed, physical damage and performance frequency reduction caused by overheating are avoided, and even favorable conditions are created for safe and efficient operation of the chip under higher working frequency.

The invention belongs to the technical field of semiconductor device packaging, and discloses a power semiconductor module three-dimensional stacking vertical commutation low-inductance packaging structure. The two vertical commutation structures are stacked and integrated on the same substrate; different from traditional two-dimensional packaging in which all elements are laid on a two-dimensional plane, three-dimensional stacked packaging suitable for power devices is proposed for the first time, and power loops are stacked and integrated; the magnetic fluxes of the stacked power loops are cancelled, so that ultra-low inductance (pH level) integration is realized; under the condition that the areas of the substrates are the same, the capacity of the module is doubled; meanwhile, dynamic current sharing design is considered, and one driving chip simultaneously drives eight GaN chips to realize parallel dynamic current sharing for the first time; the method is suitable for various topological structures including half-bridge structures, full-bridge structures, three-level ANPC structures and the like; the method is suitable for various packaging schemes, including PCB on DBC packaging, DBC substrate welding / sintering packaging and embedded packaging. Taking the packaging of the half-bridge module double-sided parallel PCB on DBC as an example, low-inductance, low-thermal-resistance and high-power-density integration is realized.

The invention relates to the technical field of inductors, in particular to an inorganic insulation integrally-formed power inductor and a preparation method thereof. The method comprises the following steps: S1, selecting a coil; s2, pre-stretching the coil; s3, pre-coating of inorganic powder is carried out; s4, pressing the magnetic powder; s5, sintering the ceramic layer at high temperature; and S6, integrally forming the inductor. By reasonably selecting the material and shape of the coil and the type of the magnetic powder and combining high-temperature sintering at the temperature of 250 DEG C or above, the magnetic conductivity and the bias resistance are improved, the diversified requirements of high frequency, high temperature, high power density and the like are met, and the performance of insulation, heat conduction and the like can be optimized; according to the integrated forming process, coil pre-packaging and magnetic core forming are completed in one step, production procedures are reduced, process integration and production efficiency are improved, production cost is reduced, the utilization rate of a magnetic core window reaches 100%, and the product size is reduced.

The invention belongs to the technical field of energy storage cooling, and particularly relates to a cooling circulation system and an equipment cooling method, and the cooling circulation system comprises a liquid inlet system, a heat exchange system and a liquid outlet system. The heat exchange system comprises a plurality of heat exchange units which are connected in parallel; the liquid inlet system is connected with the input end of the heat exchange system, and a pressure detection device, a liquid temperature measurement device I, a pollution discharge degassing tank and a liquid circulation driving unit are connected into the liquid inlet system; the liquid outlet system is connected with the output end of the heat exchange system, and a conductivity detection device, an outlet pressure detection device and a liquid temperature measurement device II are connected into the liquid outlet system. Through dynamic modular adjustment, multi-parameter intelligent control, energy-saving composite heat dissipation and high-reliability design, the problems of low heat dissipation efficiency, high energy consumption, high maintenance cost, poor adaptability and the like in the prior art are effectively solved; and particularly, the method has remarkable advantages in the aspects of precise heat dissipation of high-power-density equipment, stable operation under complex working conditions and full-life-cycle cost control.

The invention is suitable for the technical field of hovercar control, and provides a thermal-vibration-weight collaborative optimization method of a high-power-density hovercar controller, and the method comprises the steps: constructing a three-dimensional housing structure based on fractal mechanics, achieving 35-45% of weight reduction through bionic design, and remarkably reducing the weight while guaranteeing the structural strength; thermal management, electromagnetic compatibility and vibration suppression collaborative optimization layout is established, a high-heating-power module is arranged near a heat dissipation air opening, and a sensitive control unit is arranged in a center damping area of a shell; a gradient material distribution scheme is adopted, a high-heat-conduction composite material is configured in a high-heat-flow area, and a high-damping material is adopted in a vibration sensitive area. Under the high-power working condition, the heat dissipation performance of the controller is improved, vibration transmission is reduced, the overall weight is reduced, and high-reliability control hardware support is provided for the hovercar.

The invention discloses a manufacturing method of an encapsulation type driver transformer with high heat dissipation efficiency, and belongs to the technical field of power electronic equipment manufacturing. The invention aims to solve the technical problems of low heat dissipation efficiency and insufficient long-term reliability caused by limited heat-conducting property of a potting material, simple surface heat dissipation structure and difficulty in coordination of internal thermal stress of the existing driver transformer. The method comprises the following steps: constructing a three-dimensional digital model of a reinforced heat dissipation structure with a boss array and a groove array, and preparing a corresponding forming mold; a magnetic core and a winding are used as inserts to be positioned in a mold cavity, insulating colloids with different mechanical and heat conduction characteristics are poured in a vacuum environment in batches, internal gaps are fully filled with flexible colloids and stress is buffered through a segmented curing process, meanwhile, high-heat-conduction rigid colloids form an external main body and a heat dissipation structure, and an integrated potting body is formed. The method is used for manufacturing the driver transformer suitable for scenes with high power density and high heat dissipation requirements, and the heat dissipation capability and the operation reliability of the driver transformer can be remarkably improved.

The invention belongs to the technical field of robot and intelligent equipment driving, and discloses an integrated servo push rod and a control method.A push rod module is integrally designed, and a high-density motor, a ball push rod and a band-type brake are arranged in the push rod module. The invention has the characteristics of high power density, small volume, high precision, high response speed, low noise, long service life, high reliability and the like. The inside of the push rod is contacted with the deep groove ball bearing at the tail end of the screw rod through the ball retainer, and the outside is contacted with the oil-free bushing, so that the lateral strength of the push rod is improved, friction is reduced, and operation efficiency is improved. A linear encoder is arranged at the end of the screw rod, accurate control of the tail end can be achieved, a magnetic encoder is arranged at the tail end of the motor, input and output end double-closed-loop can be achieved, precision can be improved, and errors of band-type brake in power-off response time can be compensated; the lead screw is connected with the motor through the diaphragm coupling in the motor, so that the axial space is saved, and the service life of the motor is prolonged.

The invention provides a heat dissipation composite material and a preparation method and application thereof. The heat dissipation composite material comprises a bonding layer, an insulating breathable layer, a heat conduction layer and a heat conduction diffusion layer which are sequentially arranged from bottom to top. Wherein the bonding layer is obtained by mixing and reacting a polymer matrix material, a composite filler and a molecular bridging agent, the insulating breathable layer is a porous insulating material, the heat conduction layer is a graphene film, and the heat conduction diffusion layer is prepared from porous matrix composite heat conduction nanoparticles. According to the invention, through combination and structural design of each layer of material, a synergistic effect of a multi-layer structure is realized, firm and stable bonding of the heat dissipation composite material and a heating electronic device is realized, the heat dissipation efficiency and insulation air permeability of the heat dissipation composite material are remarkably improved, and the heat dissipation requirement of high-power-density electronic equipment can be met.

A modular and scalable AC / DC substation transforms AC voltage to DC voltage for driving a high-voltage and high-current load, such as a heavy work machine. Sized to fit within a standard high-cube ISO shipping container, the substation includes a main transformer attached at a center of a rectangular base with a pair of controlled rectifiers positioned on the base downstream from the main transformer, aligned parallel to a lateral axis of the base, and substantially symmetrical to a longitudinal axis of the base. The arrangement of these components on the base, together with lowpass filters and switchgear, achieves high power density for the substation, provides balanced mass for stability during shipment and placement, and helps protect personnel from accidental electrical arcing.

The invention discloses an efficient cooling driving motor for an electric industrial vehicle, which comprises a motor main body, the motor main body comprises a stator and a rotor, and the end part of a non-bearing end of a rotor rotating shaft is of a hollow structure; and the water cooling assembly comprises a rotating block, a liquid inlet pipe and a liquid outlet ring, a plurality of cooling pipes are arranged on the outer side of the rotating block in the circumferential direction, and one end of each cooling pipe is connected with the liquid outlet ring in a penetrating mode through the two sides of the stator. Cooling liquid firstly flows through the rotating hollow rotating shaft of the rotor to directly absorb eddy-current loss of a rotor core and winding heat, then is shunted to the cooling pipes on two sides of the stator through the rotating block, and absorbs heat of the stator core and the winding through the stator position, so that synchronous water cooling of a rotating part and a static part is realized; and an internal water cooling-external air cooling three-dimensional heat dissipation network is formed by matching with the air cooling assembly, so that the internal temperature difference of the motor is greatly reduced, performance degradation caused by local overheating is effectively inhibited, and a core guarantee is provided for high-power-density application and long-service-life operation of the motor.

The invention discloses a wire connecting structure of a flat wire stator, and belongs to the technical field of energy-saving motors, the wire connecting structure comprises a stator core and a stator slot, a winding is arranged in the stator slot, the stator core and the winding form a stator, the stator is a concentrated winding type stator, the longitudinal section of the winding is of an octagonal structure, and the winding is arranged in the stator slot. And the left and right sides of the windings can be broken to reduce the number of used molds and reduce the winding difficulty of the windings, and one end of each of two outgoing lines of each group of windings is on the outer diameter side of the stator while the other end is on the inner diameter side of the stator. According to the wire connecting structure of the flat wire stator, the cross section of the winding is of an octagonal structure, folding can be carried out on the two sides, the number of molds can be reduced, the winding difficulty of the winding can be reduced, compared with a traditional winding with a rectangular cross section, the slot fullness rate can be increased by 4%-8%, the end space is small, the number of opened molds is reduced, the winding difficulty of the winding is reduced, the cost is reduced, and the slot fullness rate, the power density and the efficiency are high.

According to the motor, the power system based on the motor and the adjusting method, convex ribs are arranged on an end plate of a rotor, the rotor is used for driving the convex ribs to rotate and driving cooling lubricating oil to form forced circulation in an air gap, the heat transfer efficiency of the rotor and a stator is remarkably enhanced, and the temperature rise of the rotor and the demagnetization risk of a permanent magnet are effectively controlled; meanwhile, the lubrication condition of moving parts is improved, and energy consumption and complexity caused by an extra oil pump are avoided; through the integrated design of the motor shell and a half box body of the gear box and the communicating oil duct of the sealing plate and the gear box, a shared lubricating system is constructed, cooling lubricating oil circulation sharing and heat dissipation cooperation are achieved, the overall structure is simplified, and the system reliability is improved; on the premise that the size and the weight are not increased basically, the comprehensive benefits of improving the heat dissipation performance, simplifying the system structure and reducing the manufacturing cost are synchronously achieved, and the power module is particularly suitable for application scenes with limited space and high power density requirements.

The invention belongs to the technical field of heat dissipation of high-power-density electronic devices, and relates to a topological cold plate and vapor chamber integrated structure which comprises a cover plate, a first heat exchange plate and a second heat exchange plate which are sequentially overlapped from top to bottom and are connected in a sealed mode to form the integrated structure, and a cooling cavity used for containing a liquid working medium is defined between the cover plate and the first heat exchange plate. A phase change cavity used for containing a two-phase heat transfer working medium is defined between the first heat exchange plate and the second heat exchange plate, the cooling cavity and the phase change cavity are independent of each other, and heat transfer is achieved through the solid metal wall face of the first heat exchange plate. During use, the second heat exchange plate is attached to an electronic device, heat generated when the electronic device works is transferred to the second heat exchange plate, so that the two-phase heat transfer working medium in the phase change cavity is evaporated to generate steam, and the steam is diffused in the phase change cavity, then is in contact with the upper wall surface, is condensed when encountering cold and releases latent heat; heat is conducted to the cooling cavity through the first heat exchange plate to be absorbed by the liquid working medium. The structure is compact, the temperature equalizing performance is enhanced, and the heat transfer efficiency is improved.

The single-phase bidirectional single-stage isolation matrix converter comprises a pre-stage circuit and a post-stage circuit, and the pre-stage circuit comprises an LC filter on the power grid side, a pre-stage single-phase matrix conversion circuit and an LLC resonance circuit with a high-frequency transformer; the post-stage circuit comprises a post-stage conversion circuit and an output filter capacitor; the front-stage single-phase matrix conversion circuit comprises four bidirectional switch assemblies of a full-bridge structure. Each bidirectional switch assembly comprises two unidirectional controllable MOS tubes which are reversely connected in series, one end of each bidirectional switch assembly is connected to an L line or an N line of a power grid, and the other end of each bidirectional switch assembly is connected to the LLC resonance circuit. The rear-stage conversion circuit comprises a bidirectional MOS (Metal Oxide Semiconductor) tube bridge circuit and three high-frequency transformer secondary windings which are in triangular connection or star connection; and two end points of each secondary winding are respectively connected to the upper MOS tube and the lower MOS tube of the corresponding bridge arm and then are connected to output positive and negative ends. The converter has the advantages of high power density, low current harmonic, high power factor and the like, and is small in size, strong in anti-interference capability, wide in buck-boost range, and safe and reliable in commutation.

The invention discloses a supercritical carbon dioxide phase change cooling data center thermal management system and a control method. According to the invention, the thermophysical property change characteristic of supercritical carbon dioxide near a critical point is utilized, the size is small, and high heat dissipation efficiency is realized; multi-stage energy recovery is adopted, and gradient utilization of energy is achieved through the synergistic effect of the heat exchanger and the heat regenerator; the phase change evaporation module solves the problem of high-power-density heat dissipation; the flow control module monitors the load and temperature changes of the server in real time, the response is fast, it is ensured that the server works in the optimal efficiency interval, the temperature fluctuation is small through a self-adaptive control strategy, and meanwhile energy waste and server cabinet damage can be avoided; stable cooling capacity can be kept under high-power density and high-temperature working conditions, so that the heat dissipation problem of the high-density data center is solved; the method is suitable for high-heat-flux scenes such as an AI computing center, a supercomputing center and a 5G base station; and the compact design is also suitable for cooling requirements of ship-borne and vehicle-mounted mobile computing platforms and the like, and has wide market application.

The invention relates to a novel parallel pole-arc-changing hybrid excitation brushless synchronous generator, which comprises a first magnetic circuit, a second magnetic circuit and a third magnetic circuit, the first magnetic circuit is formed by an original stator permanent magnet rotor of the motor; corresponding hybrid excitation rotors are arranged on the left and right outer sides of the stator, and a second magnetic circuit is formed between the hybrid excitation rotors and the iron core of the stator; an excitation winding is further arranged on the outer side of the corresponding hybrid excitation rotor, and the excitation winding enables common teeth of the hybrid excitation rotor to be magnetized into different polarities, so that a third magnetic circuit for increasing or weakening magnetism is formed. The motor has the beneficial effects of wide rotating speed adjusting range, high power density and high efficiency.

The invention discloses a preparation method of heat-conducting silica gel for packaging a power module chip, which comprises the following steps of: optimizing diamond micro-powder filling, surface etching and particle size compounding, so that the heat conductivity coefficient of the prepared heat-conducting silica gel can reach 3.8-4.5 W / (m.K) which is far higher than that of common silica gel (generally less than or equal to 3.0 W / (m.K)); meanwhile, the specific surface area of the diamond and the interface bonding force between the diamond and silica gel are improved through surface etching, the interface thermal resistance is reduced, a more efficient heat conduction path is formed, the packing stacking density is maximized through particle size compounding, air gaps are reduced, and a more stable and communicated heat conduction network is constructed; the SiC device is high in power density and high in switching speed, and the chip junction temperature is the key to restrict performance and reliability. The material can quickly and uniformly transfer heat of a chip to a heat dissipation substrate, obviously reduce junction temperature and temperature gradient in a module, and improve power density and long-term reliability.

The invention discloses a high-power thin film thermopile laser power meter and a preparation method thereof, and relates to the technical field of laser detection equipment. The high-power thin-film thermopile laser power meter comprises a thermopile chip and a heat sink packaging shell, the thermopile chip comprises a substrate, a thermopile layer is arranged on the substrate, the thermopile layer comprises a plurality of thermocouple lines, the adjacent thermocouple lines are connected in series, the thermocouple lines are distributed in a square shape, the thermocouple lines are distributed in a step shape, and the thermopile chip is connected with the heat sink packaging shell. And a cold end thermal resistance layer and a hot end thermal resistance layer are respectively arranged above the cold end and below the hot end of the thermopile layer. The structure of the thermopile is optimized, the heat transfer path in the thermopile chip is regulated and controlled, the stability of the thermopile chip in a low laser power test is improved, the preparation process is improved, and the cost is reduced. The problems that an existing thin film thermopile laser power meter is low in sensitivity and poor in stability during low-power measurement, and a thermopile chip is prone to aging and poor in stability during high-power density measurement are effectively solved.

The invention relates to the field of electronic power, particularly discloses a bridge resonant converter based on forward and reverse shock coordination of double transformers, and belongs to the technical field of power electronic conversion. Aiming at the problems of over-high peak current, high magnetic core saturation risk, remarkable switching loss and the like of a traditional LLC resonant converter under the requirements of a wide load range and high power density, the invention provides the following innovative schemes: a dual-transformer forward and reverse excitation collaborative structure, a zero voltage switching (ZVS) driving technology and resonant network parameter optimization.

The invention relates to the technical field of battery energy storage, in particular to a high-efficiency and high-power-density power supply which comprises a protection box, a mounting groove is formed in the protection box, and through use of a multi-stage heat dissipation assembly and an induction fire extinguishing assembly, in the working process of a power supply main body, when low-power operation is carried out, the power supply main body does not work; cooling can be achieved only through cooperation between a heat dissipation pump and a heat dissipation pipe, when high-power use is conducted and the temperature exceeds a set threshold value, a servo motor is driven to start to dissipate heat, air cooling and water cooling are matched with each other, the heat dissipation efficiency is greatly improved, the service life of the device is prolonged, and when a fire occurs in an extreme situation, an induction fire extinguishing assembly is used for extinguishing fire. The internal device is destructively driven, so that open fire is treated in the first time, the interior of the device is sealed, and the possibility that external oxygen enters the protection box is reduced and isolated, and the possibility that other injuries are caused by fire spreading when a fire breaks out is greatly reduced.

The invention relates to the technical field of motors, and discloses a multi-layer winding structure of a high-power-density flat wire oil-cooled motor, which comprises a rotating shaft, a rotor core, a stator core, a winding component and a motor shell which are concentrically sleeved from inside to outside, and is characterized in that the winding component comprises a plurality of winding bodies which are arrayed and nested in the stator core; the front and rear ends of the winding component are respectively provided with a welding end winding and a hairpin end winding. According to the multi-layer winding structure of the high-power-density flat wire oil-cooled motor, a multifunctional winding cooling structure is formed by the first cross flow groove, the second cross flow groove, the two cooling flow guide assemblies and the plurality of annular cooling grooves; after being combined with a flat wire oil cooling motor formed by a rotating shaft, a rotor iron core, a stator iron core, a winding part and a motor shell and a circulating pump transmission module for use, cooling oil can be guided and conveyed to cover most structures of the winding part in a plurality of annular cooling grooves; and the two cooling diversion assemblies comprehensively spray and cool the structures at the two ends of the winding component in a rotary output mode.

The invention provides a device for electrical performance test and high-temperature aging test of a high-power-density module product, and relates to the technical field of electronic product test and aging. A large-current clamping structure is arranged, so that the reliability requirement of long-time repeated clamping of a large-current pin in the electrical performance test and high-temperature aging test process of the high-power density module is met; a vertical pressing structure and a double-sided heat dissipation structure are arranged, so that the heat dissipation requirement of a high-power density module in an electrical performance test and a high-temperature aging test when a product works in a high heating state is met; and a double-sided temperature measurement structure is arranged, so that real-time temperature measurement and monitoring can be carried out on the upper surface and the lower surface of the high-power density module product in the electrical performance test and high-temperature aging test processes.

The invention relates to a variable-power scale-free boiler and topology heat transfer quasi-super Stirling ecological heat engine technology, in particular to a working principle of direct-current scale-free super heat exchange high power density reaching 8-16 times fuel oil stress application variable power in the ZL2012105664497.4 patent achievement innovation field of the inventor, and the working principle is applied to normal low pressure, middle high pressure, critical pressure, high pressure, high pressure, high pressure, high pressure, high pressure, high pressure, high pressure, high pressure, high pressure, high pressure, high pressure, high pressure, high pressure, high pressure, high pressure, high pressure, high pressure, high pressure, high pressure, high pressure, high pressure, high pressure and high pressure. Various types of boilers are free of scale obstruction, super in heat exchange, high in power density, ultra-low in cost rate, and safe in multi-module unit combination of less than 30-90L; a boiler heat exchange heat output'boiler 'system formed by connecting ten to hundreds of congruent module (tube panel) units in parallel is integrally matched with a magnesium catalysis water-based combustion-supporting combustion science'boiler' system of a '8-16 times fuel oil stress application 'Stirling'heat engine', and meanwhile, a new era of human cosmic rock planet carbon dioxide and carbon rock particle energy ecological metallurgy is created. The invention relates to a Stirling ecological heat engine, in particular to a variable-power scale-free multi-module once-through boiler and a topology heat transfer Stirling ecological heat engine, wherein the variable-power scale-free multi-module once-through boiler and the topology heat transfer Stirling ecological heat engine are used for gathering metamorphosis heat radiation and a three-guide interlining heat transfer and exchange body heat output system under the constraint of extreme-effect

Thermionic generators are described herein that include a variety of features that allow the devices to efficiently and effectively convert large amounts of thermal energy directly to electrical energy, such as in the form of currents and / or voltages. For example, the thermionic generators can be used to generate an electron beam from a thermionic emission device, and focus or shape the electron beam in such a way that allows the energy of electrons in the electron beam to be captured and converted to electrical energy.

The invention discloses an axial magnetic flux motor which comprises a motor shaft, the motor shaft is fixedly sleeved with a rotor, the two axial sides of the rotor are provided with an upper stator and a lower stator respectively, and the motor shaft is sleeved with the upper stator and the lower stator; according to the axial magnetic flux motor, the upper stator and the lower stator are arranged on the two axial sides of the rotor respectively, the axial magnetic fields are generated through the two stators to drive the rotor to rotate, the power density of the motor is larger, the size is smaller, the weight is lighter, and the amount of used copper is smaller.

The invention provides a topology circuit of a high-voltage acceleration power supply, a control method and a high-voltage accelerator, and relates to the technical field of power supplies. The topology circuit comprises a PFC circuit, an LLC resonance circuit and a voltage doubling rectifying circuit. The pre-stage PFC circuit rectifies the input alternating current mains supply, suppresses harmonic waves, reduces ripples, and improves the power correction factor of the high-voltage acceleration power supply; the inverter circuit of the intermediate-stage LLC resonant circuit has a soft switching function, high frequency of a power conversion device can be realized, a resonant cavity limits the change rate of voltage and current in the switching process, the switching noise is reduced, and energy is transmitted to a load through a transformer and a voltage doubling rectifying circuit. The PFC circuit and the LLC resonance circuit are simple in structure and control, on the premise that the number of circuit devices is reduced, input voltage and current are in the same phase, the operation efficiency of the circuit is improved, the size of the high-voltage acceleration power supply is effectively reduced, and the power density is improved.

The invention discloses an axial skewed pole mixed excitation V-shaped Halbach permanent magnet flux switching motor, which comprises a first stator, a first rotor, a magnetic isolation disc, a second rotor, a second stator, an excitation winding and an armature winding which are sequentially and coaxially stacked by adopting a multi-section axial stacked structure, each of the first stator and the second stator comprises a double-U-pi type stator iron core module, a magnetic isolation sheet, a permanent magnet pair and a permanent magnet; the first rotor and the second rotor are respectively attached to the two sides of the magnetic isolation disc, the first stator and the second stator are respectively composed of six double-U-pi type stator core modules and six magnetic isolation sheets in an alternating mode, permanent magnet pairs are arranged in the double-U-pi type stator core modules, and permanent magnets are arranged on the outer sides of the double-U-pi type stator core modules; the excitation winding is wound on the double U-pi type stator iron core module in a crossing mode, and the armature winding is wound on the root portion of the double U-pi type stator iron core module. The permanent magnet synchronous motor has the advantages of high power density, high torque density, high stability, wide speed regulation range, low harmonic loss, high fault tolerance and high reliability.

The invention belongs to the technical field of new energy power, and particularly relates to an unmanned aerial vehicle hydrogen fuel cell hybrid power system and a control method thereof. The system comprises a fuel cell stack which is used for providing a reference power supply and has adjustable power output; the super capacitor bank is used for outputting peak current when transient high power is needed, and has the characteristics of high power density and quick response; the lithium iron phosphate battery pack is used for providing an emergency power supply when the fuel cell fails; the dynamic bus controller integrates the voltage hysteresis comparator and the CAN bus communication module and is used for controlling energy output of the fuel cell stack, the super capacitor bank and the lithium iron phosphate battery pack; the LSTM neural network prediction module is used for predicting a future power demand according to the flight attitude, the meteorological data and a historical load curve and triggering power climbing of the fuel cell in advance; and the Buck-Boost circuit is used for the fuel cell to directly charge the super capacitor bank, so that the dynamic response speed and the system stability of the unmanned aerial vehicle in a violent maneuvering state are remarkably improved.

The invention provides an embedded power module assembly and a vehicle with the same. The embedded power module assembly includes: a plurality of copper foil layers; the number of the chips is multiple, the multiple chips are arranged among the multiple copper foil layers, part of the chips are arranged in the upper bridge areas of the copper foil layers, and the other part of the chips are arranged in the lower bridge areas of the copper foil layers; the plurality of chips are connected with one of the copper foil layers through the heat dissipation base; and the heat-conducting medium layer is arranged on the inner side of the copper foil layer close to one side of the tail end, and the heat-conducting medium layer is attached to the copper foil layer provided with the chip. The problem of high switching loss caused by large parasitic inductance of a power module in a high-power-density electric drive system in the prior art is solved.

The invention provides a high-performance double-layer graphite negative electrode and a preparation method and application thereof. The invention provides an optimal configuration design of a double-layer graphite negative electrode, an upper layer (close to a diaphragm side) of the electrode is composed of energy type graphite, a lower layer (close to a current collector side) of the electrode is composed of power type graphite, an upper layer D50 is 12-50 microns, a lower layer D50 is 1-10 microns, preferably, the upper layer comprises a combination of primary particles and secondary particles of graphite, and the lower layer of the electrode comprises the primary particles of graphite. When the double-layer graphite negative electrode disclosed by the invention is applied to a battery system, the problem of lithium separation in the charging and discharging process of the battery can be effectively solved on the whole, and the cycle life of the battery is greatly prolonged, so that the graphite-based lithium ion battery has high energy density, high power density and long service life.