68results about How to "Simplify Thermal Design" patented technology

The invention discloses an electric car modularization power system based on parallel connection of batteries and a control method. The electric car modularization power system comprises a battery system and a motor control system, wherein the battery system comprises a power supply battery pack and a battery management system, the motor control system comprises an inverter and an inverting control module, the battery management system is used for managing, sampling and controlling the power supply battery pack, the power supply battery pack is connected to the inverter through a conducting wire, the inverter is used for inverting direct currents into three-phase electric power with adjustable voltage and frequency, which is supplied to a traction motor, and the inverting control module is used for controlling the inverter and is in communication with the battery management system through a bus; power supply batteries are connected in parallel, the power supply battery pack is divided into n groups, the n groups of batteries are respectively used for supplying power to the traction motor by adopting inverter circuits, and the motor control system is combined with the battery management system, and thus the standardization and the modularization of the power system are facilitated, and the management and the replacement of the batteries are convenient.

The invention provides a photovoltaic array combiner box which comprises multiple DC (direct current) input branches, wherein the multiple DC input branches are connected in parallel and then combined into one DC output; and each branch has a maximum power tracking function so as to work at respective maximum power point. The combiner box also comprises multiple voltage compensation units connected in series with the branches respectively, and a comparison calculation unit, wherein the comparison calculation unit is used for comparing to obtain the maximum value of voltage at the maximum power point of each branch, calculating the difference between the maximum value and the voltage value at each maximum power point respectively, and outputting the difference to the voltage compensation unit corresponding to each branch respectively; and the voltage compensation unit is used for performing voltage compensation for the corresponding branch according to the difference so that the output voltage of the branch is equal to the maximum value. The photovoltaic array combiner box provided by the invention can ensure that each branch still can output voltage at respective maximum power after the output is combined, thus the total output power of the combiner box reaches the maximum.

The invention discloses an active conformal array antenna applied to an unmanned aerial vehicle platform, and sequentially comprises an antenna array surface, a body skin, a multifunctional board, anda tile-type TR assembly that are integrated and conformal from the outside to the inside, a patch is adopted as a radiation unit on the antenna array surface and is conformal with the structure of the body skin, wherein the antenna array surface comprises an antenna radiation layer, and a thermal control and support layer which are sequentially arranged from the outside to the inside, the antennaarray surface adopts an SMP blind matching connector to penetrate through the thermal control and support layer and the multifunctional board to be connected with the tile-type TR component. According to the invention, the integrated integration of the active module, the antenna array and the body skin is realized by combining rigid and flexible printed boards, the defects that a traditional design cannot realize the integrated integration of the active module and the body are overcome, and meanwhile, the occupied space is small, the anti-electromagnetic interference resistance is strong, andthe aerodynamic requirements of the aircraft is met.

The invention belongs to avionics technology, is applied to the technical field of avionics, and particularly relates to an aviation onboard recorder independent power supply. The aviation onboard recorder independent power supply comprises a charging circuit 1, a control unit 2, an energy storage unit 3, a power supply voting unit 4 and a boosted circuit 5. As a super-capacitor is adopted as the energy storage unit, compared with a charging battery, the aviation onboard recorder independent power supply has the advantages that the cycle life is more than 100 times that of the charging battery, maintenance-free of the energy storage unit of the recorder independent power supply in a full life circle is achieved, large-current charging and discharging can be borne, self-heating quantity is small, energy storage efficiency can be improved conveniently, and the heat dissipation design can be simplified conveniently. The aviation onboard recorder independent power supply is designed according to requirements of the TSO-C155 airworthiness standard, adopts the super-capacitor for energy storage, and is capable of providing a 12 W back up power supply which can last 10 minutes for a recorder after being charged for 15 minutes when a main power supply of an aircraft is cut off.

The present invention provides a DC / DC converter, a DC / DC converter apparatus, vehicle, fuel cell system and a method for driving DC / DC converter, to resolve minimization of three-phase DC / DC converter. A DC / DC converter (36) comprises a plurality of phase arms (UA, VA, WA), the phase arms (UA, VA, WA) being connected parallel to each other between the cell 24 and the fuel cell 22, each of the phase arms comprises a series-connected circuit of an upper arm switching device (81u, 81v, 81w) and a lower arm switching device (82u, 82v, 82w) and diodes (83u, 83v, 83w, 84u, 84v, 84w) connected inversely. Wherein the phase arms (UA, VA, WA) have respective midpoints connected to each other, and the single reactor (90) is inserted between the connected midpoints. According to the construction, the DC / DC converter (36) may be carried out with conversion of voltage of the phase arm (UA, VA, WA) by using a reactor (90).

The invention provides a solid-state direct current breaker based on capacitor energy storage and a control method. The solid-state direct current breaker includes a main switching thyristor, a current limiting reactor and a follow current circuit of the current limiting reactor, and an energy storage turning-off unit, wherein the anode of the main switching thyristor is connected with the positive electrode of a direct current power supply, the cathode of the main switching thyristor is connected with a load through the current limiting reactor, the follow current circuit of the current limiting reactor is connected with two ends of the current limiting reactor in parallel, and the energy storage turning-off unit is connected between the cathode of the main switching thyristor and the negative electrode of the direct current power supply. The solid-state direct current breaker based on capacitor energy storage adopts an analog circuit to realize control, a control circuit is simple and response delay is small.

This invention discloses one semi-conductor laser absorptive spectrum gas analysis method, which comprises the following steps: a, determining semi-conductor laser work temperature range and current range; b, dividing out at least two work temperature areas and at least one without absorptive area to make any one work temperature relating to at least one absorptive spectrum; c, testing the semi-conductor laser work temperature for T and accordingly determining test gas spectrum; d, according to semiconductor laser work temperature and central frequency and determining and adjusting work current; e, semiconductor laser sends light through tested gas for analysis of spectrum to get gas detector parameters for display.

A cabinet of blade server is prepared as setting cabinet height to be 7U, setting medium plate in cabinet and arranging ten connectors for containing 10 pieces of IU calculation blades on medium plate in parallel way, arranging medium plate at middle part of cabinet as its one side being space to contain 10 pieces of IU calculation blades and another end being space to place modules.

The invention relates to an optical transceiving module and a packaging method thereof. The optical transceiving module comprises a printed circuit board, wherein a through groove is formed in the printed circuit board, an iron sheet is fixedly arranged below the through groove, a ceramic substrate is fixedly arranged on the upper surface of the iron sheet, a vertical cavity surface emitting laser, a surface receiving detector, a laser driving chip, a transimpedance amplification chip and an optical fiber array are attached to the surface of the ceramic substrate, and the ceramic substrate andall components installed on the surface of the ceramic substrate are covered and packaged by means of an epoxy resin black glue. The optical transceiving module has the advantages of low cost, high reliability, good heat dissipation performance, compact structure, high expandability and the like.

The invention discloses a rapid-response device of switch power amplifier, which comprises the following parts: linear power amplifier, forestage driving, RF switch, power managing circuit of linear power amplifier to proceed real-time switch management for linear power amplifier. The realizing method comprises the following steps: 1. inputting control signal of RF switch to make the RF switch at sending condition; 2. making the power managing circuit at conductive condition; starting power for linear power amplifier and forestage driving; 3. finishing normal amplifying function through linear function and RF signal output; 4. cutting the RF input signal; making the RF switch at receiving or cutting condition; 5. cutting linear power amplifier and forestage driving power; finishing the cut of linear power amplifier and forestage driving.

This invention discloses one semi-conductor laser absorptive spectrum gas analysis method, which comprises the following steps: a, determining semi-conductor laser work current range; b, dividing the range into at least two work temperature area to make responding to at least one absorptive spectrum line; c, testing semi-conductor laser work temperature range; d, according to the work temperature and step c determining and adjusting semi-conductor laser work current; e, semi-conductor laser sends out light through tested gas to analysis the light signal to get tested gas parameters for display.

The invention discloses an isolated direct current converter applicable for a medium-voltage direct current system and a control method thereof. The direct current converter is of a modularized combined structure for a plurality of power modules through serial connection during input and parallel connection during output, and each power module consists of a switching circuit and an isolated switching circuit cascade connection. Each switching circuit consists of a switching switch, a switching power device and a short circuit prevention diode, and is used for controlling the switching and elimination of the corresponding control module, so that redundant operation and rapid fault isolation of the system are realized; when an external fault appears, the fault can be quickly eliminated, andwhen an internal fault of the module appears, the fault module can be quickly eliminated, so that normal operation of the converter is guaranteed; simultaneously, input and output voltage matching ofeach module can be guaranteed, so that the stress of voltage and current on the power device is reduced; and after the fault is eliminated, the converter also can be quickly used. The converter disclosed by the invention is high in reliability and long in service life, and is applicable for the applications such as long-distance underwater electric energy supply, interconnection of direct currentmicrogrids with different voltage levels and electrolytic aluminum and sea water desalination industries.

The embodiment of the invention discloses a method for controlling power supply voltage of a set top box, and the method comprises the following steps that a set top box power supply circuit receives a pulse width modulation signal generated by a main control chip of the set top box; the set top box power supply circuit controls the load voltage value of a feedback circuit in the set top box power supply circuit according to the received pulse width modulation signal; and the set top box power supply circuit supplies voltage to the main control chip of the set top box according to the load voltage resistance of the feedback circuit. By adopting the set top box power supply circuit and the method for controlling the power supply voltage of the set top box, the power supply voltage of the set top box can be dynamically adjusted according to the service of the set top box, the power consumption of the set to box can be effectively reduced, the energy can be saved, the heat radiation design of the set top box main control chip is simplified, the design cost of the set top box is saved, and the miniaturized design of the set top box also can be facilitated.

An optical coupling device includes: a light emitter provided on an input lead frame; a photoreceptor provided on an output lead frame; a load driving semiconductor element provided on a front surface of the output lead frame, and connected to the photoreceptor via the output lead frame; and a sealing resin section as a package for protecting the light emitter, the photoreceptor and the load driving semiconductor element, wherein a thermoelectric conversion element is provided in the package.

The invention provides a light emitting device and a protection device. The light emitting device comprises a laser source and a reflection device arranged in the light emitting direction of the laser source, and further comprises a light splitting and filtering device and a wavelength conversion device. Laser beams are reflected by the reflection device and then deflect by 90 degrees and then are transmitted to the light splitting and filtering device to come into the wavelength conversion device, the wavelength conversion device absorbs laser and emits excited light to the light splitting and filtering device, and the excited light is reflected by the light splitting and filtering device to form first emergent light. The light emitting device further comprises a light emitting diode light source, and light emitted by light emitting diode light source to the light splitting and filtering device is transmitted to the light splitting and filtering device to form second emergent light. The light emitting device further comprises a cooling backboard, and the bottom face of the light emitting diode light source and the bottom face of the laser source are fixed to the cooling faces of the cooling backboard. The first emergent light is emitted in the direction opposite to the laser source, the light emitting diode light source and the laser source can share the same cooling backboard, and accordingly cooling design is greatly simplified.

The invention discloses a hybrid power device adopting fuel and liquid gas. The hybrid power device comprises a four-stroke internal combustion engine cylinder and a pneumatic motor cylinder, wherein the pneumatic motor cylinder consists of a cylinder body, a piston and a cylinder cover, the piston is arranged in the cylinder body, the cylinder cover, the cylinder body and the piston are enclosed to define a gas source working cavity, and a gas inlet door, a gas outlet door and a spray nozzle extending into the gas source working cavity are arranged on the cylinder cover; the piston of the pneumatic motor cylinder and a piston of the internal combustion engine cylinder are connected with each other through a connecting rod mechanism, and slide alternatively in the corresponding cylinder bodies. The liquid gas and the fuel are adopted as basic sources for forming driving force, the gas emitted after the liquid gas does work can be effectively utilized as a pre-compressed gas source for further heat expansion, so that the efficiency can be furthest improved, and the pollution can be reduced. On the basis, the invention further provides a hybrid power system applying the power device and a hybrid power output construction method adopting fuel and liquid gas.

The invention provides a satellite-borne DC-DC converter combiner output circuit with low transmission power consumption. The satellite-borne DC-DC converter combiner output circuit includes a first DC-DC converter D1, a second DC-DC converter D1, a first NMOS transistor Q1, a second NMOS transistor Q2, a first Schottky diode V1, a second Schottky diode V2, a first ideal diode controller D3 and asecond ideal diode controller D4, wherein a primary power supply main line input terminal is connected to primary power supply input terminals of D1 and D2; the output terminal of the DC-DC converteris connected to the source electrodes of the NMOS transistors, and the positive poles of the Schottky diodes are connected to the source electrodes of the NMOS transistors; the negative electrodes ofthe Schottky diodes are connected to the drain electrodes of the NMOS transistors; the control terminals of the ideal diode controllers are connected to the gate electrodes of the NMOS transistors; the ideal diode controllers detect the voltage drop between the source electrodes and the drain electrodes of the NMOS transistors to adjust the magnitude of the output current of power supply; and thesource electrodes of Q1 and Q2 are shorted together as an output terminal.

The present invention provides an epoxy resin composition which is suitable as an under-fill material for three-dimensional packaging, and has a low uranium content and excellent filling properties, and in which the occurrence of voids is inhibited. The epoxy resin composition according to the present invention contains (A) a liquid epoxy resin, (B) a curing agent, and (C) an alumina filler, and is characterized in that alumina filler (C) has an average particle size of 0.1-4.9 [mu]m, and the uranium content is 0.1-9 ppb.

A fuel battery system is provided which can start up without receiving an energy supply from outside. This fuel battery system 1 is provided with an input unit 11 which is connected to a hydrogen source 41, a reformer 12 which produces a hydrogen-containing gas, a hydrogen storage container 13, a fuel battery 15 which generates power using the hydrogen-containing gas, and a control unit 18. The control unit 18 stores a threshold value of the hydrogen-containing gas necessary for start-up of the fuel battery 15, and controls the amount stored in the hydrogen storage container 13 to be greater than or equal to the amount necessary for start-up of the fuel battery 15. Further, when starting up, the fuel battery 15 generates power by receiving a supply of the hydrogen-containing gas stored inthe hydrogen storage container 13 and supplies power to the reformer 12 from a first power supply path 16. The reformer 12 starts up and the necessary hydrogen is produced.

The invention belongs to the technical field of aviation electronics and especially relates to a power input voltage stabilizing circuit. The power input voltage stabilizing circuit sequentially comprises a boost circuit channel switch 1, a boost circuit 2, an input power sampling circuit 3, a channel switch control circuit 4, a buck circuit channel switch 5, a buck circuit 6, an internal power generation circuit 7, a direct circuit channel switch 8 and a direct circuit 9 from a power input end to a power output end. The range of working voltage of electronic equipment is extended, the problem that a DC / DC module in electronic equipment cannot work normally due to power input voltage fluctuation is solved, and the working stability of electronic equipment is improved. The whole circuit works independently without the need for any external input and is easy for integrated and modular production.

The invention provides a miniature projection liquid crystal on silicon (LCOS) optical engine, which aims to solve the problem of over-low projection brightness of the conventional miniature projector. The miniature projection LCOS optical engine comprises an area light source module, an array lens assembly, a polarizing beam splitter (PBS) prism, a field lens, an LCOS chip, a polaroid sheet and a projection objective, which are fixed on an engine base and sequentially arranged along the propagation direction of light rays; the area light source module is formed by combining a parabolic reflective bowl, a white light light-emitting diode (LED) array and a Fresnel lens; the array lens assembly consists of an array lens and a converging lens; the area light source module is arranged at the bottom of the parabolic reflective bowl by a white light LED; emitted light beams are combined by a fly's-eye lens; an approximately-parallel light beam enters the PBS lens; the LCOS chip is adhered to the outside of a plane convex lens; and a formed image enters the projection objective through the polaroid sheet. The miniature projection LCOS optical engine is novel in structure and better meets requirements of the existing customer on miniature structure and projection brightness.

The invention discloses a hybrid power device with fuel and direct-injection liquid gas. The hybrid power device comprises a four-stroke internal combustion engine cylinder and a pneumatic machine cylinder, wherein the pneumatic machine cylinder comprises a cylinder body, a piston arranged in the cylinder body and a cylinder cover, the cylinder body, the piston and the cylinder cover define a gas source work cavity, and the cylinder cover is provided with a gas inlet door, an exhaust door and a liquid injecting nozzle stretching into the gas source work cavity; the piston of the pneumatic machine cylinder is connected with a piston of the internal combustion engine cylinder through a link mechanism, so that the pistons can slide in corresponding cylinders in an alternating mode. The liquid gas and the fuel are used as a basic source for forming driving force, gas exhausted after the liquid gas acts is effectively utilized to be used as a pre-compression gas source which expands after being heated, and therefore efficiency can be improved to the largest extent, and pollution is lowered. The invention further provides a hybrid power system comprising the hybrid power device, and an output construction method of hybrid power with fuel and direct-injection liquid gas.

The present invention relates to a heat radiation pad and a manufacturing method thereof. The present invention includes a base member with elasticity and a heat radiation thin film which surrounds the base member and includes a metal element. The present invention includes the steps of: forming the base member of a bar shape with elasticity; forming an adhesion layer on one side of the heat radiation thin film; and surrounds the base member with the heat radiation thin film to bone the adhesion layer to the base member. The present invention quickly discharges heat from a heating component to the outside and reduces manufacturing costs. Also, a heat radiation design is easily made by high application.

The present invention aims to provide a concentrating photoelectric conversion device which does not need to carry out the band gap design again, and can easily manufacture a solar cell which also can be obtained by the non-solar cell manufacturers, is easy in heat radiation design, and can restrain the reduction of the conversion efficiency even improving the concentrating multiplying power. The concentrating photoelectric conversion device provided by the present invention is equipped with a concentrating lens and a photoelectric conversion element arranged at the position opposite to the concentrating lens, and is characterized in that the photoelectric conversion element is equipped with a scattered light solar cell, an insulating layer arranged on the concentrating lens side surface of the scattered light solar cell, an electrode layer arranged on the insulating layer and a concentrating solar cell arranged on the electrode layer and electrically connected with the electrode layer. Moreover, the concentrating lens is made of a transparent heat convertible resin, the photoelectric conversion element is carried on an external connecting substrate, and the scattered light solar cell and the concentrating solar cell are separated electrically.

The invention provides a rocket-borne monopole telemetering transmitting antenna and a rocket based on the same. The antenna is characterized in that radiation gain is appropriate, and the antenna iseasy and convenient to install and good in consistency, does not affect the aerodynamic characteristics of the rocket and is suitable for small carrier rockets. The antenna comprises a monopole radiator, an N-type SMA joint and a metal base. The monopole radiator comprises a feed probe and a ceramic dielectric rod. The N-type SMA joint is installed in the metal base. The ceramic dielectric rod isinstalled on the metal base. One end of the feed probe penetrates through the ceramic dielectric rod in the axial direction and is connected with the positive electrode of the N-type SMA joint. The metal base is connected with the negative electrode of the N-type SMA joint.

A robot power supply system disclosed by the present invention comprises a power supply circuit, an EMI filter, a rectifying and filtering circuit, a soft start circuit, a protection circuit, a drive circuit, a sampling circuit, a power conversion circuit, a pulse width modulation circuit and a comparing and amplifying circuit. The two ends of the power supply circuit are connected with the EMI filter, an output end rectifying and filtering circuit and the sampling circuit separately, the EMI filter is also connected with the rectifying and filtering circuit and the protection circuit separately, and the rectifying and filtering circuit is also connected with the soft start circuit. The robot power supply system of the present invention satisfies the loads of different powers by changing the number of the power supply modules, each module bears the smaller electric stress, and the small-power power supply modules and a large-scale control integrated circuit are used as the basic parts, so that the research and development pressure of the large-power components and devices is relieved substantially, the thermal design is simplified, and a power supply keeps the higher efficiency and reliability. The soft start circuit can effectively prevent the situation that a switching power supply absorbs a larger current at the electrification moment, so that the efficiency reduces.

The invention provides a high-power pulse type constant-current load circuit based on an IGBT. The high-power pulse type constant-current load circuit comprises a single-chip microcomputer, a control circuit, an IGBT driving circuit, an IGBT and a feedback circuit which are connected in sequence. The single chip microcomputer receives externally set current pulse parameters and outputs a control signal to the control circuit, the control circuit outputs a reference level after performing data processing on the control signal, and the feedback circuit samples a current pulse output by the IGBT and converts the current pulse into a feedback level to drive the IGBT driving circuit to work together with the reference level and control the IGBT to output the required current pulse; the gate electrode of the IGBT is connected with the IGBT driving circuit, the collector electrode of the IGBT is connected with the test power supply, and the emitter electrode of the IGBT is connected with the feedback circuit. According to the invention, the IGBT is used as an electronic load, and the problems of small parallel withstand voltage and difficult control and maintenance of small-power transistors are solved. Through the mutual cooperation of the control circuit, the IGBT driving circuit and the feedback circuit, the IGBT output current can be accurately adjusted, so that the output current pulse of the IBGT meets the design requirement.