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265results about How to "Improve power density" patented technology

Direct-driving wave power-generating and energy-storing device and control method

The invention relates to a direct-driving wave power-generating and energy-storing device and a control method. The direct-driving wave power-generating and energy-storing device is characterized by comprising a direct-driving wave generator, an AC/DC (Alternating Current or Direct Current) converter, a DC/AC (Direct Current or Alternating Current) converter, a plurality of loads, two DC/DC (Direct Current or Direct Current) converters, a mixed energy storing system and a controller, wherein the mixed energy storing system comprises an ultra-capacitor bank and a storage battery pack; the direct-driving wave generator is used for converting the kinetic energy of waves to a low frequency alternating current and sending to the AC/DC converter; the AC/DC converter is used for converting the low frequency alternating current to a direct current and connect and connected with the input end of the DC/AC converter through a direct current bus; the output end of the DC/AC converter is connected with the loads; the direct current bus is respectively connected with one ends of the two DC/DC converters, the other end of one of the two DC/DC converters is connected with the capacitor bank, and the other end of the other of the two DC/DC converters is connected with the storage battery pack; and the controller is used for controlling the ultra-capacitor bank and the storage battery pack to regulate power flow so as to keep the balance between the output power of the direct-driving wave generator and the power of the loads. The invention can be widely applied to the process of converting the kinetic energy of sea water fluctuation to the electric energy.
Owner:TSINGHUA UNIV

Dc-dc converters providing reduced deadtime

A DC-DC power converter (100) that provides increased power density, reduced size, and reduced costs of manufacture. The DC-DC power converter (100) includes first and second input terminals (101, 102), a plurality of output terminals (116, 117), and at least one electrical element (108/109) connected to at least one of the first and second input terminals (101, 102). In the event a first voltage is applied across the first and second input terminals (101, 102), the electrical element (108/109) provides a second voltage having a value between the first voltage value and a reference voltage value. The DC-DC power converter (100) further includes a transformer (110) having a primary winding (111) and a secondary winding (112), and a switch assembly (103-107) operatively connected to the first input terminal (101), the second input terminal (102), the electrical element (108/109), and the transformer primary winding (111). In the event the first voltage is applied across the first and second input terminals (101, 102), the switch assembly (103-107) switchably applies the first, second, and reference voltages across the transformer primary winding (111) to generate at least one third voltage across the transformer secondary winding (112). The DC-DC power converter (100) further includes a rectifier (113) connected between the transformer secondary winding (112) and the output terminals (116, 117).
Owner:NORTHEASTERN UNIV

Topological magnetic integrated converter suitable for LLC resonance series

According to the defect that the magnetic member of the existing LLC resonant converter has a larger volume, the invention provides a magnetic integrated converter suitable for LLC resonant series topology, pertaining to the direct current converter. The converter designs the transformer and inductances in the original circuit of the converter into an integrated magnetic member, the converter not only can decrease the volume of the magnetic members, but also allows the leakage inductance to be easy to control, wherein the leakage inductance are centralized at primary side. The converter includes a direct-current power supply, an LLC resonant transformer, a primary circuit and a secondary rectification circuit, the converter uses the integrated magnetic member as a magnetic integrated converter, wherein, the integrated magnetic member includes a couple of relative setup EE iron cores, the iron cores are respectively winded with a primary winding and a secondary winding, part of the primary winding and entire secondary winding are winded at the middle pole, the other part of the primary winding are winded at the left side pole or right side pole; the input end of the primary winding is connected to the primary circuit, the output end of the secondary winding is connected to the secondary rectification circuit.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

High power density motive loop permanent magnetic linear electromotor

InactiveCN101127474AImprove power densityGood control characteristicsDynamo-electric machinesMotion ModePower density
The utility model discloses a moving coil permanent magnet linear motor having high power density. The utility model comprises a coil assembly, a coil assembly frame, an inner magnetic yoke, a permanent magnet, an outer magnetic yoke and other components; the coil assembly comprises a forward winding and a reverse winding; the coil assembly is fixed on the coil assembly frame, and is capable of making reciprocating linear motion in an air gap; the coil assembly frame is connected with the driven moving elements; the direction and the size of the current is regulated through an electric control system, and then the needed motion mode is realized. The permanent magnet group is arranged at one side or both sides of the coil assembly; the permanent magnet group alternately adopts permanent magnets with different magnetic directions along motion direction and forms a Halbach array. The utility model has the advantages that, the power density of the motor is improved obviously, which is 50% more than the power density of conventional linear motors; meanwhile, the utility model has better control characteristic. The utility model can be used as an executive element and applied to the situations where the volume and the mass of the linear motor need to be small, and the thrust and the accuracy of the linear motor need to be large; for example, the utility model can be applied to the electro-hydraulic proportional control field, the robot field or other fields.
Owner:NANJING UNIV OF SCI & TECH

Coupling inductor applicable to multi-phase interleaved parallel converter

The invention discloses a coupling inductor applicable to a multi-phase interleaved parallel converter. A structure of the coupling conductor is mainly formed by combining backcoupling transformers consisting of two phases of windings and an energy storage inductor; for an n-phase interleaved parallel converter, the quantity of the backcoupling transformers is n-1 or n or n(n-1)/2, and the connection relation of the backcoupling transformers is a central type or a head-tail closure type or a two-two combination type respectively; and the energy storage inductor is serially connected with at least one phase of the winding in the backcoupling transformers, the winding quantity of the energy storage inductor is between 1 and n, and various phases of the windings of the energy storage inductor are independent from each other or are subjected to forward coupling. The coupling inductor ensures that an energy storage function and a filtering function are borne by the energy storage inductor and the backcoupling transformers respectively by splitting the energy storage function and the filtering function, can effectively avoid the intrinsic contradiction between the energy storage function and the filtering function in a multi-magnetic circuit magnetic core, further reduce the loss and volume of magnetic components, improve the power density, the conversion efficiency and the output dynamic performance of the converter, and is suitable for the multi-phase interleaved parallel converters.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

Proton exchange membrane used for direct methanol fuel cell and preparation method thereof

The invention discloses a proton exchange membrane used for a direct methanol fuel cell and a preparation method thereof. The method comprises: first, polyether-ether-ketone is added into concentrated sulfuric acid for sulfonation reaction to obtain sulfonating polyether-ether-ketone; ball milling is carried out on the sulfonating polyether-ether-ketone, inorganic cross linker, silane coupling agent and organic solvent to obtain suspending liquid; the mass volume ratio between the sulfonating polyether-ether-ketone and the organic solvent is 1/5g/ml-1/15g/ml; the mass ratio between the silane coupling agent and the inorganic cross linker is 1:5-10; the mass ratio between the sulfonating polyether-ether-ketone and the inorganic cross linker is 5-20:1; finally, the mixture solution of the sulfonating polyether-ether-ketone, the inorganic cross linker and proton conductor are made into membrane which is then dried for demoulding, and the proton exchange membrane used for the direct methanol fuel cell can be obtained. The membrane features good methanol diffusion resistance, low cost, high proton conductivity and excellent water-resistant swelling capacity at the higher temperature. The preparation method is simpler as well as lower in raw material price and production cost.
Owner:SOUTH CHINA UNIV OF TECH

Double-equal pole double-section stator/rotor reluctance generator

The invention relates to a double-equal pole double-section stator/rotor reluctance generator, comprising two sections of stators and rotors of a salient pole structure or a non-salient-pole structure formed by laminating silicon-steel plates. A stator salient pole is provided with armature concentrated windings or layer windings; the windings are connected in series or in parallel according to the N-N polarity of the armature windings to form a phase, and the windings are connected in series or in parallel according to the S-S polarity of the armature windings to form the other phase; the rotors are equipped with rotating magnetic poles with the same pole number with the stators, and the adjacent pole windings of the rotors are connected in series or in parallel to form a plurality of N and S groups; the rotors can adopt excitation magnetic poles and permanent magnetic poles in different forms and permanent magnetic and electro-magnetic mixed poles, and a rotor excitation device is arranged on a motor shaft; each rotor can be divided into an inner rotor and an outer rotor; and the armature windings can be arranged on the stators or the rotors. In the invention, by adopting an equal-pole-number stator/rotor technology and series/parallel connection dynamic combination of the windings, output voltage can be regulated conveniently, the utilization ratio of the windings is improved, and power density and efficiency of the generator are enhanced.
Owner:张世清

SiC JFET device for integrating schottky diode and making method thereof

The invention discloses a SiC JFET (junction type field effect transistor) device for integrating a schottky diode. A primitive cell structure of the SiC JFET device for integrating the schottky diode in an active region from bottom to top successively comprises a drain electrode, a SiC substrate, a buffer layer, an n-drifting layer, two p+ trap layers arranged in bilateral symmetry, an n channel layer, and two p+ regions arranged in bilateral symmetry on the two sides of the n channel layer; a p+ region, a n++ region, the p+ region, the n++ region and another p+ region are successively arranged from left to right in symmetry; a source electrode, a grid electrode, a schottky contact, another grid electrode and another source electrode are successively arranged from left to right in symmetry; the source electrode is arranged on the p+ region and the n++ region, adjacent to the left and right sides of the primitive cell structure, the grid electrode is arranged on the middle p+ region on the left and right sides of the primitive cell structure, the schottky contact is arranged on a partial middle n region of the primitive cell structure in the active region, and no schottky contact is arranged on other parts of the n region of the primitive cell structure. The SiC JFET device that integrates JFET and V JFET into one, and integrates a schottky diode is disclosed. In addition, a making method is provided.
Owner:BEIJING CENTURY GOLDRAY SEMICON CO LTD

Offshore large direct-drive switch reluctance wind driven generator power converter and system thereof

The invention provides an offshore large direct-drive switch reluctance wind driven generator power converter and a system of the converter. The converter is composed of a switch reluctance wind turbine, a power converter body, a DC/DC converter body and a system controller. The switch reluctance wind turbine is connected with the power converter body. The power converter body is connected with the DC/DC converter body. Output of the DC/DC converter body is connected with output of a DC/DC converter body of the other switch reluctance wind driven generator power converter system in series or parallel and then outputs electric energy to the shore through a direct-current submarine cable. The system controller is connected with the power converter body and connected with the DC/DC converter body. The switch reluctance wind turbine is connected with the system controller. According to the system, two-phase windings of a four-phase switch reluctance generator can work at the same time, exciting voltage is adjustable, the function of outputting direct-current voltage and adjusting boost can be achieved, the power density and the controllable flexibility are improved, and the power converter is suitable for the field of offshore large wind power plants.
Owner:CHINA JILIANG UNIV

Processing method for processing rectangular photovoltaic cell silicon slices through columnar crystal silicon rods

The invention relates to the technical field of crystal silicon photovoltaic cells, in particular to a processing method for processing rectangular photovoltaic cell silicon slices through columnar crystal silicon rods. The processing method comprises the steps of firstly, determining and processing of columnar faces of the silicon rods, secondly, silicon rod cutoff, thirdly, slicing, fourthly, treatment of irregular sides and corners, and fifthly, chamfering and slicing. According to the processing method, after the crystal orientation of the needed crystal silicon slices is determined, a longitudinal cutting technology is adopted for obtaining the crystal silicon slices of the needed size and crystal orientation. The processing method has the advantages that compared with a traditional transverse slicing method, the same rectangular silicon slices are processed, the effective utilization rate of the cylindrical crystal silicon rods can be increased, and under the condition of the same silicon rod utilization rate, the more regular rectangular silicon slices can be processed out; and the silicon slices processed through the method can adjust the voltage, current and power levels of a photovoltaic module in a standardized manner. The photovoltaic module formed by the rectangular silicon slices has higher power density and lower unit cost than the existing technology.
Owner:江西宇泰新能源有限公司

Preparation method of nitrogen-doped graphene electrode

The invention provides a preparation method of a nitrogen-doped graphene electrode, which comprises the following steps: acquiring a graphene oxide suspension; mixing the graphene oxide suspension with a metal salt solution to obtain an electrolyte; putting at least one pair of electrode pieces connected with direct current into the electrolyte, switching on the direct current to carry out electrophoresis so as to obtain electrode pieces with graphene oxide deposited on the surface, and drying under vacuum conditions; reacting the graphene oxide deposited on the surface of the dried electrode pieces with ammonia gas to carry out nitrogen doping reaction, thereby obtaining a nitrogen-doped graphene electrode precursor; and in a hydrogen protective atmosphere, carrying out reduction reaction on the nitrogen-doped graphene electrode precursor and hydrogen to obtain the low-oxygen-content graphene-doped graphene electrode. The preparation method provided by the invention has the advantages of simple technique, high efficiency and low cost; and the nitrogen-doped graphene electrode prepared by the method has the advantages of low equivalent series resistance, high electric conductivity and low oxygen content in the nitrogen-doped graphene in the nitrogen-doped graphene electrode.
Owner:OCEANS KING LIGHTING SCI&TECH CO LTD +1

Nanometer carbon-lead super capacitor battery

The invention discloses a nanometer carbon-lead super capacitor battery, which comprises electrodes, wherein the electrodes are made of a carbon nanomaterial and a foam lead composite material; the carbon nanomaterial and the foam lead composite material are prepared by adopting an electrolytic deposition method; and the electrolytic deposition method comprises the following steps: preparing an electrolytic deposition solution; adding a carbon nanomaterial into the electrolytic deposition solution prepared in the step (1); and performing electrolytic deposition to obtain the carbon nanomaterial and the foam lead composite material. According to the nanometer carbon-lead super capacitor battery disclosed by the invention, a lead-acid battery is combined with a super capacitor, so that high energy storage density and high power density are realized simultaneously; high charging and discharging performances are achieved, and the charging speed of the battery is the same as the discharging speed in an unsaturated charging running mode; a carbon material can be used for preventing the phenomenon of sulfation on the cathode, so that a past failure factor of the battery is improved, and the service life of the battery is prolonged; and the nanometer carbon-lead super capacitor battery has very high safety performance, and is an environment-friendly safe battery.
Owner:JIANGSU HUAFU STORAGE NEW TECH DEV
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