175results about How to "Improve output power density" patented technology

To realize power supply to each gate drive circuit without using an individual dedicated power supply for each gate drive circuit. A power conversion apparatus includes an individual drive unit that does not require a dedicated power supply, and includes gate drivers connected to switches and interface circuits and a power converter gate drive configured with a common power supply for supplying power to the gate drive unit. Power is supplied from main circuits or a number of common power supplies fewer than that of the number of the switches through one or more power supply terminals included in the interface circuit. Also, the signal can be transmitted by isolation from a signal source to the gate drivers.

The present invention discloses a microbial fuel cell stack, which comprises a plurality of microbial fuel cells and is characterized in that the microbial fuel cell includes a perforated frame, a cathode and an anode, and that the cathode wraps the perforated frame to form an anode chamber, and that the anode is arranged inside the anode chamber. Wires are respectively extended from the cathode and the anode. The microbial fuel cells are connected head to tail sequentially via pipes, and thus the anode chambers thereof interconnect each other. The first microbial fuel cell of the cell stack has a feeding port, and the last one has a discharging port.

A cooling device suitable for cooling a laser diode bar constituting a surface illuminating device as a light source for exciting a laser medium of a solid-state laser oscillator of high power. The cooling device is capable of flowing coolant at sufficient flow rate by reducing the pressure loss in the flow passage of the coolant in the device, to realize a light source device of small thickness with high cooling capability and high reliability. The cooling device comprises a first plate member, one or more second plate member and a third plate member to be joined together to form a laminated body. The second plate member has grooved paths formed on both surfaces thereof and having depths greater than a half of thickness of the plate member, and also opened paths for communicating grooved paths formed on the first plate member and the third plate member. The pressure loss in the flow passage of coolant is reduced by increasing a sectional area of the flow passage by the grooved paths and the opened path of the second plate member without lowering mechanical strength of the device and without increasing a manufacturing cost of the device.

The invention relates to a solid oxide fuel cell, in particular to medium temperature solid oxide fuel cell cathode material and application thereof. Being calculated by a weight percentage, the cathode material consists of 40-99 percent of perovskite-type composite oxides, 1-30 percent of CeO2 doped with rare earth oxides, and 0-59 percent of electrolyte material; the electrolyte material refers to ZrO2 stabilized by 5-20 mol percent of Y2O3 and / or ZrO2 stabilized by 5-20 mol percent of Sc2O3. The invention can change the structure of the active components of the cathode material, can improve the activity of the catalytic oxygen reduction reaction of the cathode material, can accelerate the dissociative adsorption of oxygen on the surface of the cathode material, the diffusion of oxygen species on the surface of the cathode material, the transmission process of the oxygen species in a three-phase bounded domain, charge transfer, and other electrochemical processes, and can increase the activity of the cathode of the solid oxide fuel cell.

The invention discloses a solar thermal power generation system by thermoelectric conversion, comprising a sunlight-concentrating and receiving module, a solar tracking module, a photothermal-conversion module for absorbing sunlight then transforming sunlight into thermal energy and a combination of semiconductor thermoelectric module, the combination-type cooling module is under the semiconductor thermoelectric module. In the invention, TE module can directly convert solar thermal and waste heat to electricity without heat transfer medium, heat storage tank, turbine, and mechanical moving part, thus realizing small scale, compact system with high efficiency; Due to the adopting of low concentrating lens with tracking system and compound waste heat supplying module, thus reducing floor area and effectively improving temperature difference and power generating efficiency of the overall system. In comparison with that of traditional solar thermal power generation system, the new system kept the advantages, including: low investment and low maintenance cost. In comparison with that of solar cell power generation system, the system has the advantages: large power in small area and possible in stable output; furthermore a heating source apart from solar energy is introduced to guarantee the stable current supply.

A method for in-situ treatment of sediment simultaneous with microbial electricity generation is provided, comprising steps of constructing a microbial fuel cell, placing the microbial fuel cell in the sediment, forming a cell circuit, and cultivating microorganisms to generate electrical power. The method overcomes shortcomings found in the prior art and uses organics in the sediment as fuels to in-situ treat the sediment with simultaneous electricity generation. A device for implementing the method is also provided, which can be expanded in different directions as needed and is easy to maintain during long-term operation. The device has many advantages including compact structure, easy operation, low cost, high output power density, significant reduction in sediment COD, no influence on water flow, and environment-friendly

The invention discloses a stator hybrid short magnetic circuit magnetic suspension switched reluctance generator which is composed of a stator iron core, a rotor iron core, four suspension poles, eight power generation poles, fourteen rotor poles, four sets of suspension windings, two groups of excitation windings and two phase power generation windings. The four suspension poles are arranged on the stator iron core at equal interval, each two of the eight power generation poles are arranged between the four suspension poles at equal interval, the fourteen rotor poles are arranged on the rotor iron core at equal interval, the four sets of suspension windings are respectively wound on the four suspension poles independently, the two phase excitation windings and the two phase power generation windings are wound on the power generation poles opposite in the radial direction in lap mode, pole arcs of the suspension poles are two times of pole arcs of the power generation poles, and pole arcs of the power generation poles are equal to an arc pole of a rotor. The stator hybrid short magnetic circuit magnetic suspension switched reluctance generator adopts a hybrid stator and a short magnetic circuit structure, solves the problem of coupling of excitation, power generation and suspension, overcomes a magnetic flux reversal phenomenon, reduces magnetic motive force and stator iron core loss, and improves working efficiency and output power density.

This invention puts forward a MESFFT structure used in HF and large power field, namely, a biconcave structure of MESFET, in which, two independent grooves are formed on the active layer between a gate source and a drain by etching and a projected platform is formed between the two grooves, the gate electrode can deposit on the platform totally or the groove between the platform and the gate source to form a step structure, and the groove between the gate source and the drain stops the exhaust layer under the gate electrode to expand to the source and drain shift region so as to reduce the source and drain capacitance to increase the frequency property of the devices, and the groove can reduce thickness of channels of the shift region and modulate the field distribution of the shift region.

This invention relates to an improved coating method for preparing oxide ceramic membrane. The method comprises: (1) preparing a support; (2) preparing a slurry of the raw materials; (3) coating the slurry onto the support; (4) spin-coating and leveling; (5) drying the membrane blank; (6) repeating the steps 3-5; (7) calcining at a high temperature. The method is convenient and rapid, and has such advantages as high raw materials utility and good membrane quality. The zirconium oxide electrolyte membrane thus prepared can be used to prepare solid oxide cells with high output power density and stable performance.

A submerged generating device directly utilizing liquid metal magnetic fluid wave energy consists of an outer barrel (1), a piston rod (2), a return spring (13), an inner barrel (3), a piston (4), a main hydraulic cylinder (5), a rigid support (11), a base (12), n (n=1, 2, 3...) hydraulic units and n (n=1, 2, 3...) liquid metal magnetic fluid generators. The outer barrel (1) is coaxial with an inner barrel (3), the inner barrel (3) is fixed on the rigid support (11), the inner barrel (3) is fixedly connected with the rigid support (11) and the base (12), the base (12) is fixed on a seabed, the outer barrel (3) is connected with the piston (4) which is coaxially arranged in the main hydraulic cylinder (5) via the piston rod (2) which is arranged along an central axis of the inner barrel (3), the return spring (13) is sleeved outside the piston rod (2), the main hydraulic cylinder (5), the n hydraulic units and the n liquid metal magnetic fluid generators are arranged in the inner barrel (3), and the whole device is vertically arranged below the sea level.

Catalysis layer including more than one layer of containing hydrophobicity material (such as PTFE) and catalysis of platinum carried by carbon (Pt/C) is prepared on surface at side of leveling layer of gas diffusion layer. The leveling layer is processed by hydrophobicity and carbon powder in advance. After being baked under protection of inert gases at 320-380 deg.C, the catalysis layer is spray coated by solid polyelectrolyte in certain quantity. Then, more than one layer of slurry composed of solid polyelectrolyte, electrode catalyst and solvent in specific proportion is prepared on the catalysis layer. After being baked under protection of inert gases at 100-380 deg.C, electrode of fuel cell composed of composite catalysis layers in different hydrophobicity and hydrophilicity is obtained. Advantages are: satisfied conduction of protons and electrons, better transmission or diffusivity of gases and water, expanded reaction interface, and raised power density.

The invention provides a double-heterojunction gallium nitride based HEMT (High Electron Mobility Transistor) taking aluminum-gallium-nitrogen as a high-resistance layer, comprising a substrate, a nucleating layer, an unintentionally-doped high-resistance layer, an unintentionally-doped high migration rate layer, an aluminum nitride inserting layer, an unintentionally-doped barrier layer and an unintentionally-doped gallium nitride or aluminum-gallium-nitrogen cap layer, wherein the nucleating layer is manufactured above the substrate and is 0.01-0.50 microns in thickness; the unintentionally-doped high-resistance layer is manufactured above the nucleating layer; the unintentionally-doped high migration rate layer is manufactured above the unintentionally-doped barrier layer; the aluminum nitride inserting layer is manufactured above the unintentionally-doped high migration rate layer and is 0.7-5 nm in thickness; the unintentionally-doped barrier layer is manufactured above the aluminum nitride inserting layer; and the unintentionally-doped gallium nitride or aluminum-gallium-nitrogen cap layer is manufactured above the unintentionally-doped barrier layer and is 1-5 nm in thickness. According to the double-heterojunction gallium nitride, the channel electron migration rate and the limiting capability to two-dimensional electronic gas are obviously improved; power leakage of the buffering layer is inhibited; and meanwhile, crystal lattice stress of the barrier layer is reduced, the defect density is reduced, and the stability and the reliability of the work of a device are improved.

The invention provides a method for manufacturing melted carbonate fuel battery negative nickel board with non-water-base flowing process which belongs to fuel battery field. The invention uses carbonyl nickel power material, uses compound rare earth oxide as impurity modifying material, the flow pulp solvent uses the compound solvent of cyclohexanone and n-butanol, manufactures the melted carbonate fuel battery nickel negative electrode biscuit with non-water-base flow process, the biscuit is baked in temperature and air condition, and acquires the multi-aperture negative electrode nickel board. The product has an excellent stability and electrochemical catalyst performance; the specific area of the nickel board is high, the aperture rate is between 60%-80%, the average aperture diameter is between 6-10micrometers; the process is simple, the cost is low.

The invention relates to a MESFET (Metal-Semiconductor Field Effect Transistor) with a stepped buffer layer structure, belonging to the technical field of power semiconductor devices. The buffer layer becomes stepped by etching an epitaxial buffer layer of the device, so that an active layer epitaxially growing on the buffer layer has varying channel thickness. The thickest part of the buffer layer is right below a gate electrode, and the thickness of the buffer layer below both sides of the gate electrode is small. The active layer is reversely stepped, the thinnest part of the active layer is right below the gate electrode, and the thickness of the active layer below both sides of the gate electrode is large. The MESFET with the stepped buffer layer structure has the advantages of good DC characteristic, frequency characteristic and output power density, and is applicable to microwave and high power fields.

The invention provides a biological cathode type microbial fuel cell which comprises a plurality of cathode cavities, a plurality of anode cavities and a plurality of ion exchange membranes, wherein the plurality of cathode cavities and the plurality of anode cavities are arranged at intervals, and each cathode cavity is separated from the adjacent anode cavity through one ion exchange membrane. Each cathode cavity comprises a first cavity, a cathode active material, two first current collecting metal nets, a plurality of first electronic export ends, a first water inlet, a first water outlet and an aeration device, wherein the two first current collecting metal nets are arranged in the first cavity in parallel and at an interval; the plurality of first electronic export ends are arranged on the first current collecting metal nets at intervals and connected with an external circuit. Each anode cavity is basically the same with each cathode cavity in structure, and the difference is that each anode cavity is filled with an anode active material and no aeration device is arranged.

The related preparation method for anti-CO composite positive electrode catalysis layer of proton-exchange member fuel cell comprises: with Pt/C or PtM/C(M is one or more of Ru, Mo, Sn, Ni, Au/Fe2O3,Au/Al2O3, Au/Co2O3, Fe, Co and W) as electric catalyst, a hydrophilic catalyst layer named inner catalyst layer with former catalyst and polymer solid as main components connected to the proton exchange member, a hydrophobic catalyst layer named outer catalyst layer with the catalyst and some hydrophober as main components connected to a diffused layer, and one or more middle catalyst layer with hydrophilic and hydrophobic feather gradient change. This invention has well performances.

The invention discloses a piezoelectric and electromagnetic composite power generation device for capturing wave energy. The piezoelectric and electromagnetic composite power generation device comprises a floater, a swing rod, a power generation box and a support, the swing rod extends out of the power generation box, the extending end of the swing rod is hinged with the floater, and the power generation box is supported by the support; the power generation box comprises a box body, and at least two coil power generation assemblies are arranged on the inner wall of the bottom of the half box body in the circumferential direction; the center shaft is sleeved with a rotating disc and two vibration piece discs symmetrically arranged along the rotating disc, and the vibration piece discs are provided with at least two piezoelectric power generation assemblies in the circumferential direction; and at least two magnets penetrating through the rotating disc are arranged on the rotating disc in the circumferential direction. The external environment transmits low-frequency vibration to the power generation box through a rocking bar, and the power generation box uses a plurality of piezoelectric power generation assemblies on the vibration piece disc to be matched with a plurality of groups of magnets on the rotating disc and a plurality of coil power generation assemblies on the box body, so that high-frequency vibration power generation of the piezoelectric power generation assemblies and electromagnetic induction power generation of the coil power generation assemblies are realized, and the power generation efficiency is improved.

There is described a cascade-type compact hybrid energy cell (CHEC) that is capable of individually and concurrently harvesting solar, strain and thermal energies. The cell comprises an n-p homojunction nanowire (NW)-based piezoelectric nanogenerator and a nanocrystalline/amorphous-Si:H single junction cell. Under optical illumination of ˜10 mW/cm² and mechanical vibration of 3 m/s² at 3 Hz frequency, the output current and voltage from a single 1.0 cm²-sized CHEC was found to be 280 μA and 3.0 V, respectively—this is are sufficient to drive low-power commercial electronics. Six such CHECs connected in series were found to generate enough electrical power to light emitting diodes or drive a wireless strain gauge sensor node.

After specifications of a power converter are determined, circuit parameter values, a semiconductor device to be used, and an equivalent circuit of the semiconductor device are determined, and parameter values of the equivalent circuit are extracted. Semiconductor device loss is calculated from semiconductor device equivalent circuit parameter data, circuit parasitic parameter data, and circuit basic parameters. Determination as to whether or not the circuit loss optimal value has been achieved is made in consideration of power conversion circuit component parameter data. When the optimal value has not been achieved, the circuit parasitic parameter values are set again so as to create the circuit parasitic parameter data. When the optimal value has been achieved, the semiconductor device loss and the circuit parasitic parameter values at that time are output as design data, and the power converter is designed by use of the optimized semiconductor device loss and circuit parasitic parameter values.

The invention provides a piezoelectric-electromagnetic hybrid vibration energy collector and a preparation method thereof. The vibration energy collector comprises a first substrate, a second substrate and a third substrate, wherein the first substrate, the second substrate and the third substrate are stacked on each other. The first substrate and the third substrate are etched to form first and second cantilever structures respectively. A first groove is formed on the lower surface of the first substrate. The first cantilever structure is above the first groove. A second groove is formed on the upper surface of the third substrate. The second cantilever structure is below the second groove. The third groove and the fourth groove are formed at corresponding positions on upper and lower surfaces of the second substrate, and three groups of vibration pickup structures with different resonant frequencies are assembled. The vibration energy collector prepared by the preparation method hasthe advantages of high energy collection efficiency, output power and output power density (W/cm<2>), small size, high precision, easy mass production, low manufacturing cost and easy miniaturization..