93results about How to "Optimize thermal design" patented technology

A light emitting diode (LED) light engine includes a solid transparent dome mounted on one or more LED dies to form a base module, a flexible sheath having embedded therein a phosphor that converts light of a first wavelength range to light of a second wavelength range, the sheath being attached to the base module so that the sheath conforms to a light emitting surface of the dome. The sheath emits light of the second wavelength range when the LED is emitting light of the first wavelength range. Further sheaths may be formed each with different phosphors or phosphor blends, and one of the sheaths may be selected to cover the base module depending on the color of light to be produced by the light engine.

The invention discloses a 36-pulse high-power frequency conversion rectifier transformer, comprising triphase input primary winding which is mounted on a bracket and adopts Y-shaped connection and a phase shifting secondary winding adopting epitaxy triangle connection, wherein, the secondary winding comprises three groups, each of group comprises 6 phase shifting groups, the phase shifting angles are respectively +25 degrees, +15 degrees, +5 degrees, -5 degrees, -15 degrees and -25 degrees, each phase shifting group angle difference is 10 degrees; each phase is formed by series connection of a plurality of power units, adjacent groups of the triphase secondary output differ 10 degrees, the 6 phase shifting groups obtain 18 positive pulses and 18 negative pulses by controlling and triggering silicon controlled IGBT by different timing sequent of triphase pulses; the each phase shifting group has 3 taps, and each group has 18 taps in all which are connected correspondingly and arranged on the output wire ranging of one side of the bracket, and three groups of output wire ranging are used for connecting the transducer; the invention can reach less than 5% of network side current harmonics relief and has compact structure, small volume, simple installation, small field wiring and convenient debugging.

The invention relates to an LED (Light-emitting Diode) screen display unit which comprises an LED circuit board, and a power supply and a control panel, wherein the front face of the LED circuit board is equipped with an LED lamp while the back face of the LED circuit board is equipped with an electronic element, and power supply and signal combination hubs; the power supply and control panel is connected with the combination hubs; the LED screen display unit further comprises an insulated heat-conducting layer which is orderly adhered to back face of the LED circuit board and has a peripheral outline adapted to the LED circuit board, and an aluminum base; the aluminum base is internally provided with through holes for containing the combination hubs; one face of the aluminum base, which is close to the LED circuit board, is provided with a groove position for containing the electronic device; the insulated heat-conducting layer is provided with openings for the combination hubs to penetrate through; and the power supply and control panel is arranged at the back face of the aluminum base. The invention further relates to an LED display screen assembled by the LED screen display units. The LED screen display unit has the advantages of improving the radiation design, prolonging the service life and reducing the transportation and maintenance cost and is applied to the field of the LED display screen.

The invention discloses a millimeter-wave multi-channel space waveguide power distribution synthesizer and a method. The power distributor comprises a four-channel waveguide power distributors and four two-channel waveguide power distributors, a first port, four second ports and a first power allocation part are arranged in the four-channel waveguide power distributor, the first power allocation part is used for dividing one path of signal of electromagnetic wave into four paths of signals in equal proportion, a third port, two fourth ports and a second power allocation part are arranged in the each two-channel waveguide power distributor, the third port is connected with each second port, the second power allocation part is used for further dividing the four paths of signals into eight paths of signals in equal proportion, each path of signal is separately subjected to power amplification, the single path of signal subjected to amplification pass through the power synthesizer having the same structure with the power distributor, and multi-path power synthesis of electromagnetic signals are completed. The millimeter-wave multi-channel space waveguide power distribution synthesizer has the advantages of wide band, high capacity, high isolation, high efficiency, low loss and the like.

The invention relates to a fuel cell air supply system test device and a control method thereof. The system test device comprises an air main circuit, an air compressor cooling circuit, a heat transfer device cooling circuit and a humidification regulating circuit; wherein the air inflow pipeline of the air main circuit is in communication with the air inlet of an air compressor; the air outflow pipeline of the air main circuit is in communication with the air outlet of the air compressor; the coolant supply port of the air compressor cooling circuit is in communication with the coolant inlet of the air compressor; and the coolant recovery port of the air compressor cooling circuit is in communication with the coolant outlet of the air compressor; the air outflow pipeline of the air main circuit includes a heat transfer device and a humidification device; the coolant supply port of the heat transfer device cooling circuit is in communication with the coolant inlet of the heat transfer device; and the coolant recovery port of the heat transfer device cooling circuit is in communication with the coolant outlet of the heat transfer device. The technical solution of the invention can optimize the overall design of the fuel cell air supply system and ensure the performance and the service life of the fuel cell.

The invention relates to a light emitting diode surface light source device, which comprises a substrate and a plurality of light emitting diode chips arranged on the substrate in array type arrangement. The thickness of the substrate is more than 1 mm. The area of the light emitting diode chip is between 0.08 and 0.25 mm <2>; and the distance between every two light emitting diode chips is more than twice of the dimension of the chip. The light emitting diode surface light source device uses the chip with small dimension and controls the distance between the chips and the thickness of the substrate, can achieve the promotion of luminous efficiency of the whole surface light source device through utilization of the chip with the small dimension, can maintain the temperature of the chip in a lower state, reduce the amplitude needed for radiation and is further favorable for the following radiation design of the whole light emitting diode surface light source device.

The invention provides a refrigerator, which comprises a box body defining a refrigerating chamber inside and a refrigerating chamber door body composed of a door body, a door liner and a foaming layer. A containing box with an ice making and cooling chamber is arranged at the top of the box body, an ice making evaporator and a fan are arranged in the ice making and cooling chamber, and a heatingpart is arranged on the ice making evaporator to heat and defrost the ice making evaporator; an ice making chamber with an ice maker is formed in the door liner; a top air supply chamber is formed inthe containing box, a top air inlet chamber and a top air return chamber are formed in the top air supply chamber, the bottom of the top air inlet chamber is respectively provided with a top air outlet and a top air return inlet penetrating through the top of the box body, and the upper part of the door liner is provided with an ice making chamber air inlet and an ice making chamber air return inlet penetrating through the ice making chamber. When the refrigerating chamber door body is closed, the ice making chamber air inlet communicates with the top air outlet, the ice making chamber air return inlet communicates with the top air return inlet, so that the amount of cooling supplied to the ice maker is increased and the ice making efficiency of the ice maker is improved.

The invention discloses a power supply module satisfying requirements for a power supply unit of an anti-interference antenna of an airborne satellite. The module comprises a casing, a circuit board and input and output connectors, the circuit board is sealed in the casing, and the input and output connectors are fixed in the two ends of the circuit board respectively; and the circuit board is provided with an input overcurrent protection circuit, a reversal connection preventive protection circuit, a DC filtering circuit, a peak voltage inhibition circuit, an overvoltage surge inhibition and self-recovery type overvoltage protection circuit, a filtering power storage circuit, an undervoltage protection setting circuit and a DC voltage conversion circuit. The sealed metal shielding casing and the metal connectors wrap the circuit board, a high electromagnetic shielding performance of the power supply module is ensured, the power supply module can satisfy index requirements, in the aspect of electrical performance, for the power supply unit of the anti-interference antenna of the airborne satellite of different models protection functions are complete, input and output misinsertion is prevented, the power supply index is kept accurate and consistent, the production efficiency can be improved, the research and development period is shortened, and the product and development cost is reduced.

The invention provides a unipolar SPWM (Sine Pulse Width Modulation) dead-time-free modulation method of an H-bridge cascade multilevel converter. The method realizes the dead-time-free control of a chopper arm of the H-bridge converter through a digital logical circuit and certain dead time is set for a direction arm of the H-bridge converter only at every half working frequency cycle, so that the problem that the voltage on the direct-current side of the H-bridge cascade multilevel converter and the harmonic content of output current is influenced due to the dead time can be ignored. By introducing a control signal, the direction arm and the chopper arm realize interchange by taking two-divided frequency of working frequency as a cycle, the problem that the action of the switching device of the H-bridge converter is unbalanced under the situation of unipolar SPWM dead-time-free control is effectively solved, the thermal stability is good and the heat dissipation design and the long-term operation of the device are facilitated.

A high efficiency satellite transmitter comprises an RF amplifier chip in thermal contact with a radiant cooling element via a heat conducting element. The RF amplifier chip comprises an active layer disposed on a high thermal conductivity substrate having a thermal conductivity greater than about 1000 W/mK, maximizing heat conduction out of the RF amplifier chip and ultimately into outer space when the chip is operating within a satellite under normal transmission conditions. In one embodiment, the active layer comprises materials selected from the group consisting of GaN, InGaN, AlGaN, and InGaAlN alloys. In one embodiment, the high thermal conductivity substrate comprises synthetic diamond.

A light-emitting diode and a manufacturing method thereof relate to a light source structure, which solves the problem that the light-emitting angle of the existing LED cannot exceed 180° at most, and the lighting angle is limited. The light-emitting diode of the present invention uses high thermal conductivity glue on the carrier. One or more light-emitting chips are fixedly connected; the carrier and the light-emitting chip are electrically connected with wires, so that the carrier and the light-emitting chip become a semi-finished light-emitting diode; The invention utilizes the lens to condense the light of the light-emitting chip first, then refracts and scatters the light, so that the light shape is fuller and has a 3D light-emitting effect. The good heat dissipation structure and the popularization of the production process make the yield rate (99%) higher, which greatly reduces the manufacturing cost of the product.

The invention is a dummy testing method of electron equipment wind way character curve, it includes following steps: dummy forming model, founds the structure model of equipment in geometry model of components, position and assembling relation; sets simulation testing environment; carries on preprocess such as grid dividing; blowing and convulsions dummy testing; testing data processing; formin wind way character curve, the tested wind way resistance and the corresponding wind quantity is interpolation processed, then gets the wind way character curve of the equipment.

Techniques for determining one or more heat transfer characteristic values of a structure, such as an electronic device, are disclosed. A heat flux vector magnitude and a temperature gradient vector magnitude for a portion of the structure are determined, and a product of the heat flux vector magnitude with the temperature gradient vector magnitude is obtained. More particularly, the dot product of the heat flux vector magnitude with the temperature gradient vector magnitude may be obtained to provide a bottleneck heat transfer characteristic value. Alternately or additionally, a cross product (or related operation) of the heat flux vector magnitude with the temperature gradient vector magnitude is obtained to produce a shortcut heat transfer characteristic value.

The invention provides a refrigerator which comprises a refrigerator body and a refrigerating chamber door body. A refrigerating chamber is defined by the refrigerator body, and the refrigerating chamber door body comprises a door main body, a door liner and a foaming layer; a containing box with an ice-making cold-supply chamber is arranged at the top of the refrigerator body, and an ice-making evaporator and a fan are arranged in the ice-making cold-supply chamber; an ice-making cavity with an ice-making machine is formed in the door liner, a top air feeding chamber is further formed in thecontaining box, a top air inlet chamber and a top air return chamber are formed in the top air feeding chamber, a top air outlet and a top air return opening which penetrate the top of the refrigerator body are formed in the bottom of the top air feeding chamber, and an ice-making chamber air inlet and an ice-making air return opening which communicate with the ice-making cavity are formed in theupper portion of the door liner; and when the refrigerating chamber door body is closed, the ice-making chamber air inlet communicates with the top air outlet, and the ice-making air return opening communicates with the top air return opening. According to the refrigerator, the ice-making cold-supply chamber and the top air feeding chamber are arranged at the top of the refrigerator body, the topspace of the refrigerator body is sufficiently used, sufficient cold capacity is provided for the ice-making machine, and the ice-making efficiency of the ice-making machine is improved.

The invention provides a refrigerator which comprises a tank body defining a refrigeration chamber, refrigeration chamber door bodies each of which comprises a door body, a door lining and a foaming layer, door body side air inlet ducts and door body side air return ducts; the top of the tank body is provided with an accommodating tank which is provided with an ice making and cold supplying chamber; the ice making and cold supplying chamber is internally provided with an ice making evaporator and a fan; the ice making evaporator is provided with a heating component; each door lining is internally provided with an ice making cavity which is provided with an ice maker; the accommodating tank is internally provided with a top air supply chamber; the top air supply chamber is provided with a top air inlet duct and a top air outlet duct; the door body side air inlet ducts are configured to be connected and communicate with the top air inlet duct when the refrigeration chamber door bodies are closed; and the door body side air return ducts are configured to be connected and communicate with the top air outlet duct when the refrigeration chamber door bodies are closed. For the refrigerator provided by the invention, by arranging the ice making and cold supplying chamber and the top air supply chamber on the top of the tank body, the top space of the tank body is fully utilized, sufficient cold quantity is provided to the ice makers, and the ice making efficiency of the ice makers is improved.

The invention is applicable to the field of projection and provides a double-lamp illumination device and projection equipment. The double-lamp illumination device comprises two white light sources which are arranged in parallel, wherein a color wheel is arranged on an output light path of each of the two white light sources; the two color wheels have the same structure and synchronously rotate; and a light equalization system which can directly receive emergent light from the color wheels is arranged on the output light paths of the two color wheels. By the double-lamp illumination device, the light emitted from the two light sources is coupled to the light equalization system in a non-overlapped mode in different spaces, the interference loss generated by coupling two beams of light in the same narrow space is avoided, the problem that the light rays cannot fully enter an extremely small light entrance is solved, and the utilization rate of light energy is improved, so that the projection brightness is improved; and moreover, the light penetrating through the color wheels is not required to be strictly focused at the light entrance of the light equalization system, the positions of the first light source and the second light source are not strictly limited, and the thermal design of the device is improved.

The present disclosure discloses a power system with hot-swap with a buck converter. The power system comprises a front stage, a hot-swap stage and a load stage; wherein the hot-swap stage comprises: a buck converter having a switch operate at ON/OFF state to provide a desired output voltage to the load stage with low power loss and optimized thermal design.

A short trouble current limiter in particular relates to transmission and distribution network failure current limiter. It features on available bridge circuit type short trouble current limiter basic, rectifying bridge arm consisting of controllable solid-state switch tube series connected with current limiting resistance shunt circuit and then series connected with diode. The present invention realizes inductor and resistor combined current limiting, not only limiting failure current peak value but also steady state value.