303 results about "High power electronics" patented technology

The invention discloses an environmental-protection anti-corrosive heat-dissipation powder paint, and a preparation method and application thereof. The environmental-protection anti-corrosive heat-dissipation powder paint comprises the following raw materials in parts by weight: 40-90 parts of matrix resin, 2-40 parts of curing agent, 0.5-10 parts of carbon nanotube, 0.5-2 parts of additive, 0-4.5 parts of hexagonal boron nitride, 0-15 parts of aluminum nitride, 0-10 parts of magnesium nitride, 0-10 parts of silicon carbide and 5-30 parts of pigment and filler. The composition and proportioning of the raw materials of the powder paint disclosed by the invention are scientific and reasonable. The experimental result indicates that the powder paint has the advantages of favorable heat-dissipation effect, high efficacy enhancement rate (higher than 60%) and favorable cooling effect (more than 20 DEG C), and can effectively solve the problem of poor heat-dissipation effect in the high-power electronic product, thereby prolonging the service life of the electronic product. The powder paint disclosed by the invention is free of organic solvent, and is environment-friendly and safe; the powder paint disclosed by the invention also has favorable comprehensive properties, such as flexibility, hardness, adhesive force and the like, and stable chemical properties; and the coating formed by the powder paint has the advantages of high corrosion resistance and shock resistance, favorable insulation property and wide application range.

A method for forming a carbon nanotube array on a metal substrate includes the following steps: providing a metal substrate (11); depositing a silicon layer (21) on a surface of the metal substrate; depositing a catalyst layer (31) on the silicon layer; annealing the treated substrate; heating the treated substrate up to a predetermined temperature in flowing protective gas; introducing a carbon source gas for 5-30 minutes; and thus forming a carbon nanotube array (51) extending from the treated substrate. Generally, any metallic material can be used as the metal substrate. Various carbon nanotube arrays formed using various metal substrates can be incorporated into a wide variety of high power electronic device applications such as field emission devices (FEDs), electron guns, and so on. Carbon nanotubes formed using any of a variety of metal substrates are well aligned, and uniformly extend in a direction substantially perpendicular to the metal substrate.

A method for forming a carbon nanotube array using a metal substrate includes the following steps: providing a metal substrate (11); oxidizing the metal substrate to form an oxidized layer (21) thereon; depositing a catalyst layer (31) on the oxidized layer; introducing a carbon source gas; and thus forming a carbon nanotube array (61) extending from the metal substrate. Generally, any metallic material can be used as the metal substrate. Various carbon nanotube arrays formed using various metal substrates can be incorporated into a wide variety of high power electronic device applications such as field emission devices (FEDs), electron guns, and so on. Carbon nanotubes formed using any of a variety of metal substrates are well aligned, and uniformly extend in a direction substantially perpendicular to the metal substrate.

Embodiments of the present invention provides an electronic component cooling system and method that diverts a portion of a cooling fan's cooling air from high power electronic components such as processors and directs the cooling air to other electronic components of a system. Active cooling air may be provided at higher velocities and lower temperatures to cool electronic components of a system such as a computer or other electronic device. An attach block may be thermally coupled to a first electronic component. A heat exchanger may be thermally coupled to the attach block. A cooling fan may receive inlet air and may generate cooling air. A plenum duct between the cooling fan and the heat exchanger may direct the generated cooling air from the fan to the heat exchanger. A portion of the generated cooling air from the cooling fan may be diverted towards a second electronic component included in the system.

The invention relates to a high-effective integral spray cooling system, which solves heat dissipation problem in field such as high power electron or laser system. The spray cooling system includes a spray cavity, a heat exchanger, a cooler, a circulating pump and a system working medium circulation pipeline, wherein the heat exchanger is a heat pipe heat exchanger; one end of the heat pipe of the heat pipe heat exchanger is a condensation end, and the other end is an evaporation end; the evaporation end is arranged in the spray cavity and is a steam condenser, and the condensation end is arranged in a water cooling shell-and-tube heat exchanger outside the spray cavity. The invention separates steam cooling and liquid cooling, which is beneficial to respectively increase heat transfer effect in condensation and cooling process; employs the heat pipe condenser to further increase heat transfer performance in condensation process and reduce heat exchange area of the condenser; and arranges the condenser in the spray cavity for making spray cooling structure more compact and reducing flow resistance of working medium steam, thereby reducing operating pressure of the spray cavity and being beneficial to increase general heat dispersion performance of spray cooling.

The invention provides large-area freestanding carbon nanotube paper and a preparation method thereof. The carbon nanotube paper is composed of disordered carbon nanotubes and in a non-woven fabric form. The preparation method comprises the steps of: dissolving carbon nanotube powder in a solvent, dispersing it uniformly and placing the dispersion solution in a pumping filtration device, conducting pumping filtration to deposit the carbon nanotube on filter paper, then separating the carbon nanotube paper and the filter paper, thus obtaining a target product with thickness ranging from micrometers to hundreds of micrometers. The method of the invention is not limited to a specific carbon nanotube kind, pumping filtration device and dispersion degree, and can be realized by ordinary filtering equipment and dispersion equipment. With an area more than 50cm<2>, the prepared carbon nanotube paper has the advantages of freestanding capability, low content and easy removal of a dispersing agent, controllable flexibility and poriness, simple operation technology, and low cost, thus being applicable extensively in the fields of new energy, heat radiation of high power electronics, advanced chemistry, chemical and biological separation, filtering membranes and high performance light polymer composite materials.

The invention discloses a high-performance directional heat conduction copper-base diamond composite material and a preparation method thereof. A plurality of diamond sticks are distributed on a copper base body in parallel in the same direction; the diameters of the diamond sticks are 0.5 to 10 millimeters; and distances among the diamond sticks are 0.5 to 50 millimeters. As the plurality of columnar diamond sticks with high heat conduction rate are arranged in the copper base body in the same direction, the composite material has high directional heat conduction performance along the direction; and the composite material can be used as electronic package, heat sink materials and the like and can solve the problem of package of high-temperature, high-frequency and high-power electronic devices.

The invention discloses an embedded strong-current high-power PCB (Printed Circuit Board) and a manufacturing method thereof. The method comprises: (1) milling a hollow groove on a core board; (2) fixedly clamping and embedding a conductor structure member which is same as the hollow groove in shape and not larger than the core board into thickness in the hollow groove; (3) laminating a first copper foil layer on the upper surface of the core board by a first semicuring piece, and laminating a second copper foil layer on the lower surface of the core board by a second semicuring piece; (4) drilling the laminated product, performing image transfer and image making on the first and second copper foil layers, forming a circuit needed by design and a part meeting large power and circuit control on the copper foil layers, simultaneously, performing hole metallization on the formed through hole to obtain the thickness of copper needed on the hole wall, and then performing solder masking manufacture; and (5) performing blind-sink hollowing on corresponding parts, needing to be connected on the product, of the conductor structure member after solder masking, exposing the conductor structure member, drilling the conductor structure member to form wire holes connected with other external connecting pieces. Compared with the prior art, in the invention, the conductor structure member is embedded into the inner layer of the PCB, interconnection of a large-current output end and an instrument input end by utilizing holes or surfaces on the conductor structure member, simultaneously, component packaging is performed by other circuit part lines except the high-power conductor structure member embedded into the PCB so as to control the circuit, so that the original wire connection is replaced to achieve the circuit control part, and the problems in the integration process of the power and circuit control parts of strong-current high-power electronic products are solved.

A power electronics module includes a heat sink and an electronic package having a first layer in direct thermal communication with the heat sink. At least one electronic component is disposed between the first layer and a second layer. A thermally conductive element is in direct thermal communication with the second layer and carries heat from a first portion of the second layer to a second portion of the second layer such that the heat is transferred from the second portion of the second layer to the heat sink through the first layer.

The invention discloses a low-filling-capacity and high-heat-conductivity graphene/silicone grease composite material and a preparation method thereof. Heat-conductive silicone grease is prepared by filling functional reduction-oxidation graphene sheet with silicone oil. The preparation method of the composite material comprises the following steps: preparing the functional reduction-oxidation graphene sheet as heat-conductive filler; sufficiently mixing the modified heat-conductive filler and dimethicone matrix in a double-roller open mill to uniformly disperse the functional reduction-oxidation graphene sheet in the silicone oil matrix. The heat-conductive silicone grease provided by the invention can be used for effectively avoiding the contacting gap between a high-power electronic component heating element and a heat radiation device, so that the interface contact thermal resistance can be reduced, a high-efficiency heat radiation passage is formed, and heat transfer is accelerated; the silicone grease is beneficial to encapsulation and radiation of the high-power electronic components, can be used for improving the reliability of the electronic component products and prolonging the service life of the products, and is simple in preparation process.

The invention discloses a pulse wavelength modulation (PWM) generator based on field programmable gate array (FPGA). The generator comprises an FPGA, wherein the FPGA is loaded with a decoding interface unit, a triangular carrier generating unit and n PWM signal generating units. The novel PWM signal generator disclosed by the invention can be realized by combining with FPGA hardware programming language and FPGA circuit design software tool, so as to better solve the problem in a high-power electronic system that the precision is affected since computation is heavy and digital control is delayed due to multiple paths of PWM signals; the carrier frequency, the dead time and the enable signal can be designed according to demands of the system, and the application range is wide and flexible application to various situations is realized; and meanwhile, the PWM generator still has the advantages of high reliability, reduced hardware design cost, strong antijamming capability and the like when being applied to other PWM signal generating circuits.

The invention relates to radiating technology applied to fully sealed electronic cabinets, in particular to a radiating method and a radiating device applied to high power electronic equipment required to be fully sealed in outdoor severe environment. By adopting a Carnot refrigeration cycle principle, a low temperature and low pressure liquid cooling medium enters a cold plate radiator (also called internal heat exchanger) arranged in a sealed cabinet through a sealed pipe, absorbs heat generated when calorific electronic elements arranged on the cold plate radiator work, and is evaporated into low temperature and low pressure superheated steam; the low temperature and low pressure superheated steam passes through a liquid-vapor separator, and dried superheated gas is sent into a compressor, and compressed into high temperature and high pressure gas; the high temperature and high pressure gas is sent into a condenser to release heat, and is condensed into supercooled liquid; the supercooled liquid is subjected to pressure reduction by resistance of capillarity tubes into low temperature and low pressure two-phase fluid; and the fluid passes through a filter and a pipe, and is sent into the cold plate radiator, and the heat of the fluid is absorbed by the cold plate radiator to realize circulation, wherein an electronic mainframe adopts a fully sealed cabinet structure so as to achieve the waterproof, dampproof, dustproof and electromagnetic shielding aims. The device adopting the radiating technology has the advantages of high power, small volume, easy control of temperature, low noise, low cost, high heat exchange efficiency and the like.

The invention relates to a technology for heat dissipation, in particular, a method of heat dissipation and a device of heat dissipation for a large power electronic device. The invention adopts a two-level cyclic cooling device, among which, a first level cooling device is a cyclic liquid cooling device, and the cyclic liquid of the cyclic liquid cooling device exchanges heat with a radiator fixed with a heating electronic device so as to cool the heating device on the radiator; while a second cyclic cooling device is a heat pump refrigerating plant which cools the cyclic liquid. The invention cools the large power electronic device by combining liquid cooling and evaporative cooling. The invention has the advantages of small volume, manageable temperature, low noise, low cost, and high efficiency of heat exchange, etc.

A high temperature hybrid-circuit structure includes a temperature sensitive device which comprises SiC, AlN and/or Al_xGa_1-xN(x>0.69) connected via electrodes to an electrically conductive mounting layer that is physically bonded to an AlN die. The die, temperature sensitive device and mounting layer, which can be a thin film of W, WC or W₂C less than 10 micrometers thick, have temperature coefficients of expansion within 1.06 of each other. The mounting layer can consist entirely of a W, WC or W₂C adhesive layer, or an adhesive layer with an overlay metallization having a thermal coefficient of expansion not greater than about 3.5 times that of the adhesive layer. Applications include temperature sensors, pressure sensors, chemical sensors and high temperature and high power electronic circuits. Without the mounting layer, a thin film piezoelectric layer of SiC, AlN and/or Al_xGa_1-xN(x>0.69), less than 10 micrometers thick, can be secured to the die.

The invention is for an apparatus and method for removal of waste heat from heat-generating components including high-power solid-state analog electronics such as being developed for hybrid-electric vehicles, solid-state digital electronics, light-emitting diodes for solid-state lighting, semiconductor laser diodes, photo-voltaic cells, anodes for x-ray tubes, and solids-state laser crystals. Liquid coolant is flowed in one or more closed channels having a substantially constant radius of curvature. Suitable coolants include liquid metals and liquids with low vapor pressure. The former may be flowed by magneto-hydrodynamic effect or by electromagnetic induction. The latter may be flowed by magnetic forces. Alternatively, an arbitrary liquid coolant may be used and flowed by an impeller operated by electromagnetic induction or by magnetic forces. The coolant may be flowed at very high velocity to produce very high heat transfer rates and allow for heat removal at very high flux.

A high power semiconductor laser lighting device has a housing, a fan module arranged in an exhaust hole in the housing, a base connected to the bottom wall of the housing and disposed on a side of the fan module, and a semiconductor laser constant-temperature module. The base has a driving unit with at least one high power electronic component connected to fins of the fan module. The semiconductor laser constant-temperature module has a metallic partition to enclose a vacuum formed in a front portion of the housing, and a heat insulation layer arranged in the vacuum. The metallic partition has a side connecting the heat dissipation plate and an opposite side connecting a heating portion of a thermoelectric cooling chip, which includes a cooling portion connecting to a semiconductor laser lighting module. The high power semiconductor laser lighting device to keep an output power thereof constant within various environments.

An electrical circuit assembly includes an electrical circuit substrate having a first side; a heat sink including a metal base plate having a first side and a second side, and a plurality of fins extending from the second side; and a thermally conductive and electrically insulating adhesive directly interconnecting at least a portion of the first side of the electrical circuit substrate with the first side of the base plate.

The invention discloses a preparation method and application of a high thermal and electrical conductivity adhesive. The heat transfer between a high-frequency, high-heat and high-density electronic chip and a heat sink is satisfied, and the reliability and the stability of the service of high-power electronic components are improved. A conductive filler used in the high thermal and electrical conductivity adhesive provided by the invention is nano-silver heat-reduced from flake silver powder and an organic silver complex. The high thermal and electrical conductivity adhesive is prepared fromthe following raw materials by mass percent: 65 to 75 wt% of flake silver, 13 to 22 wt% of organic silver complex, and 12 to 18 wt% of organic carrier. The preparation method and application of the high thermal and electrical conductivity adhesive disclosed by the invention have the advantages that an organic silver complex solution is adopted to effectively regulate and control the viscosity of aslurry, the microscopic interface defects caused by the flake silver as a 'framework' are overcome, the phonon transmission efficiency is improved, and a more efficient thermal conductivity path is constructed; on the other hand, during heat curing, the organic silver complex undergoes in-situ reduction sintering while resin is cured by heating, an effective link between a substrate and a chip can be achieved, and a high-thermal-conductivity structure can be constructed.

The invention relates to radiating technology applied to fully sealed electronic cabinets, in particular to a radiating method and a radiating device applied to high power electronic equipment required to be fully sealed in outdoor severe environment. The invention adopts a cooling liquid circular cooling device; cooling liquid absorbs heat generated when power elements work through a liquid-cooled radiator arranged in a mainframe; a recycle liquid pump conveys the cooling liquid having absorbed the heat into a high-efficiency radiator outside the mainframe; and a fan of the high-efficiency radiator performs enforced air cooling on the cooling liquid so as to achieve the aim of high-efficiency radiating, wherein the mainframe adopts a fully sealed cabinet structure so as to achieve the waterproof, dampproof, dustproof and electromagnetic shielding aims. The device adopting the radiating technology has the advantages of high power, small volume, easy control of temperature, low noise, low cost, high heat exchange efficiency and the like.

Rechargeable cells in cylindrical form are arranged within frames in a honeycomb structure and coupled by connecting straps outside the frames to form cell pack. Several cell packs, an electronic switch and control circuit are integrated into the battery housing. A bus bar extends around the perimeter of the housing. A high density MOSFET switch is coupled between the bur bar and the battery contact. A high power electronic clamp disposed across the battery terminals absorbs or redirects transients. An active, high-efficiency, low-noise cell balance converter or a LC based resonant converter may also be provided. For advanced battery applications a +5V CAN bus interface is provided via two circular connectors. Thermistors are provided for use in a thermal protection scheme.

The invention relates to a preparation method of vertically arrayed graphene thin films. The preparation method comprises the following steps: a), preparing an oxidized graphene solution; b), coating a substrate with the oxidized graphene solution; c), reducing oxidized graphene into a graphene thin film through a strong reducing agent; d), cutting the graphene thin film in a designed mold, and folding the cut graphene thin films into vertically arrayed graphene thin films; e), curing the vertically arrayed graphene thin films with a binding agent; f), polishing the surfaces of the cured graphene thin films to ensure that the polished graphene thin films are in better contact with the surface of a device, and finally filling the polished graphene thin films with a polymer adhesive to improve the interlayer contact between the graphene thin films. The vertically arrayed graphene thin films prepared according to the preparing method can be applied to the field of high-power electronic devices, such as being used as an interface heat dissipation material to provide a heat dissipation solution.

The present invention relates to an apparatus and method for dissipating heat from high-power electronic devices. The assembly includes a high-current substrate, such as a printed circuit board supporting an electronic device, a heat pipe thermally coupled with the electronic device and an assembly case which also forms a heat sink, and thermal transient suppression material which may be thermally coupled with the electronic device and the heat pipe.

The invention discloses a single-side printed circuit board with ultrahigh heat conducting performance and a manufacturing method thereof. A metal boss used for mounting high-power electronic elements or chips is arranged on a metal substrate, circuits are arranged on other areas except the metal boss, the metal boss is integrally connected with the metal substrate, and non-conductor positions of the high-power electronic elements or chips can directly contact with the metal boss on the metal substrate. As the metal substrate is a copper substrate or aluminum substrate with heat conductivity coefficient higher than 200W/mK, the electronic elements or chips directly contact with the metal substrate, good heat conduction effect can be achieved, and radiating requirements of electronic elements or chips with power higher than 150W are met. Further, the heat transfer coefficient of an existing PCB is increased from 10W/mK to 200W/mK, stability and reliability of high-power electronic elements and high-speed computing chips are improved greatly, while service lives of the high-power electronic elements and high-speed computing chips are prolonged.