30results about How to "High-power operation" patented technology

A surface-emission laser diode includes an active layer, a pair of cavity spacer layers formed at both sides of the active layer, a current confinement structure defining a current injection region into the active layer, and a pair of distributed Bragg reflectors opposing with each other across a structure formed of the active layer and the cavity spacer layers, the current confinement structure being formed by a selective oxidation process of a semiconductor layer, the pair of distributed Bragg reflectors being formed of semiconductor materials, wherein there is provided a region containing an oxide of Al and having a relatively low refractive index as compared with a surrounding region in any of the semiconductor distributed Bragg reflector or the cavity spacer layer in correspondence to a part spatially overlapping with the current injection region in a laser cavity direction.

A method, and a resulting device, for fabricating a heterojunction bipolar transistor (HBT). HBT devices have a high transconductance typical of bipolar devices and are additionally capable of high-power operation. To achieve the aforementioned characteristics, HBT devices are generally of the npn type, preferably with a thin, heavily doped base. The thin, heavily doped base maintains a low base-spreading resistance, leading to a high maximum oscillation frequency. In order to maintain a high doping concentration while minimizing outdiffusion of the dopant material, carbon is remotely doped into the base region. Details of the carbon dopant techniques and procedures are described with respect to fabrication of an exemplary HBT device.

The invention relates to a method for generating an optical output, said method comprising the steps of: providing first and second electrical signals; providing a bipolar light emitting transistor device comprising a collector region, a base region and an emitter region; providing a collector electrode coupled to the collector region and an emitter electrode coupled to the emitter region, and potential coupled with respect to the collector electrode and the emitter electrode; providing an optical coupling in optical communication with the base region ; providing first and second base electrodes coupled to the base region; and coupling the first and second electrical signals to the first and second base electrodes, respectively, to generate The region emits and couples into the optical coupling an optical output that is a function of the first and second electrical signals. The present invention also discloses an improved pnp transistor laser and a technique for switching back and forth between a stimulated emission mode and a spontaneous emission mode for generating output laser pulses.

Improved electrical and thermal properties of solder alloys are achieved by the use of micro-additives in solder alloys to engineer the electrical and thermal properties of the solder alloys and the properties of the reaction layers between the solder and the metal surfaces. The electrical and thermal conductivity of alloys and that of the reaction layers between the solder and the -metal surfaces can be controlled over a wide range of temperatures. The solder alloys produce stable microstructures wherein such stable microstructures of these alloys do not exhibit significant changes when exposed to changes in temperature, compared to traditional interconnect materials.

The present invention provides a semiconductor laser device including a heat sink having one main surface, an n-AlGaAs cladding layer disposed on the main surface of the heat sink, an AlGaAs active layer disposed on the n-AlGaAs cladding layer and a p-AlGaAs cladding layer disposed on the AlGaAs active layer. An effective refractive index and a thermal resistance between a main surface on the heat sink side, of the AlGaAs active layer and a main surface on the heat sink side, of the n-AlGaAs cladding layer are respectively set smaller than those between a main surface on the side opposite to the heat sink, of the AlGaAs active layer and a main surface on the side opposite to the heat sink, of the p-AlGaAs cladding layer.

A method of humidifying and cooling a fuel cell system is provided. The method of humidifying and cooling a fuel cell system includes: exhausting, by a fuel supply unit, a hydrogen gas to a reservoir in which condensed water of an anode is stored. Additionally, a hydrogen gas and condensed water are pumped and the hydrogen gas and the condensed water are exhausted to the humidifier. Additionally, compressed air of an air compressor is delivered to the humidifier heat is exchanged with compressed air in the humidifier. The hydrogen gas and compressed air in which a heat is exchanged in a humidified state is delivered to an anode and a cathode, respectively.

A resonator in a semiconductor laser device includes a semiconductor substrate, an n-type cladding layer and a p-type cladding layer formed on or above the semiconductor substrate, and an active layer sandwiched between the n-type cladding layer and the p-type cladding layer. A ridge extending in an axial direction of the resonator is formed at an upper surface of the resonator. The ridge includes an emitting-side end portion, a non-emitting-side end portion, a taper portion allowing a width of the ridge to be decreased in a taper-like manner from the emitting-side end portion toward the non-emitting-side end portion, and a step portion provided on a side of the emitting-side end portion with respect to the non-emitting-side end portion, and allowing the width of the ridge to be changed in a step-like manner.

The invention relates to a transport vehicle for the hybrid power engineering. The transport vehicle comprises a transmission system, a hydraulic drive system, a hydraulic steering system, a hydraulic wet-type braking system and a micro electrical control system, wherein the transmission system comprises an engine, a first clutch connected with engine, a motor-generator connected with the first clutch, a pump set connected with the motor-generator, an inverter connected with the motor-generator, a battery pack connected with the inverter and a motor and a steering oil cylinder which are driven by the pump set. According to the transport vehicle for the hybrid power engineering, a power source adopts oil and electricity hybrid power, air pollution is reduced greatly, the oil consumption is reduced greatly, exhaust emission and environmental pollution are reduced, the whole energy consumption is reduced, service lives of components of a break system are prolonged, and the operation security of the vehicle is improved.

A transmission system for a work vehicle, which is capable of reliably mitigating, with relatively simple arrangement, shocks caused by speed changes even in a work vehicle such as a bulldozer in which almost all operations are performed with the engine operating at full load. In the transmission system which converts the output torque of an engine into torque according to work load by operations for shifting speed gears through disengagement/engagement of friction clutches, if a downshift from a higher speed gear to a lower speed gear is effected while the engine operating at full load, the friction clutch controlling valves, controller and friction clutches allows the friction clutch corresponding to the higher speed gear to slide so as to enable power transmission and the engine controlling fuel injection system and controller allows the engine to perform high power operation (overload operation) during the sliding of the friction clutch.

The invention discloses a single crystal optical fiber and a preparation method thereof. The single crystal optical fiber comprises an optical fiber core, inner cladding and outer cladding, and the optical fiber core is a solid single crystal fiber. The preparation method comprises the following steps: preparing a plurality of tubular glass preform rods having mutually-matched inner and outer diameters; performing drawing on the preform rods to obtain glass cladding having a two-layer structure; and inserting the solid single crystal fiber into the inner cladding, and performing heating tapering to obtain the single crystal optical fiber having the glass cladding. According to the single crystal optical fiber and method provided by the invention, materials, quantities, sizes and positionsof the tubular components adopted in the method are adjustable, the optical and thermal properties of the tubular components can be matched with a single crystal material to the greatest extent, so that the mode quality and high power operation of the single crystal optical fiber can be ensured; and the single crystal optical fiber has the advantages of a simple structure and convenient preparation, and the method breaks a bottleneck of difficult preparation of cladding of a conventional single crystal optical fiber, and is an ideal cladding preparation solution for the single crystal opticalfiber.

A FET employing a micro-scale device array structure comprises a substrate on which an epitaxial active channel area has been grown, with a plurality of micro-cells uniformly distributed over the active channel area. Each micro-cell comprises a source electrode, a drain electrode, and at least one gate electrode, with a first metal layer interconnecting either the drain or the source electrodes, a second metal layer interconnecting the gate electrodes, and a third metal layer interconnecting the other of the drain or source electrodes. Each micro-cell preferably comprises a source or drain electrode at the center of the micro-cell, with the corresponding drain or source electrode surrounding the center electrode. The number and width of the gate electrodes in each micro-cell may be selected to achieve a desired power density and/or heat distribution, and/or to minimize the FET's junction temperature. The FET structure may be used to form, for example, HEMTs or MESFETs.

An luminous diode in liquid-cooled mode and its packaging method use cooling liquid being filled to replace epoxy resin for cladding heat source of crystalline grain of normal-use luminous diode partially in order to let the cooling liquid contact with and absorb the heat produced by the crystalline grain of luminous diode, and furthermore to transfer heat to the other part of the luminous component for exhausting the heat to the air so that the temperature of luminous diode crystalline grain can be decreased for high current driving. The packaging principle of it also can be used for the radium ray diode in mode of wall emission or broadside emission as well as for luminous diode of macromolecule or micromolecule.

The invention discloses a high-power single-longitudinal-mode holmium-doped solid laser device. A first pumping source and a second pumping source are positioned on two transverse sides of Ho: YAG ceramic, a first reflecting body Bragg grating VBG1 is placed on the right side of a longitudinal output optical path of the YAG ceramic, laser reflected by the first reflecting body Bragg grating VBG1 enters a second reflecting body Bragg grating VBG2 by normal incidence, is subjected to normal reflection of the second reflecting body Bragg grating VBG2, and then is reflected back to the longitudinal output optical path of the Ho: YAG ceramic via the first reflecting body Bragg grating VBG1, reflectance spectra of the two VBG are overlapped, and an output coupling mirror is placed on the left side of the longitudinal output optical path of the Ho: YAG ceramic. The high-power single-longitudinal-mode holmium-doped solid laser device has the beneficial effects that the output laser has narrowline width, single-longitudinal-mode output is implemented, and high-power running can be realized.

The invention relates to a current interruption control method for a direct-current transformer. The direct-current transformer is formed by connecting inputs of a plurality of resonant dual-active bridge converters in series and connecting outputs of the resonant dual-active bridge converters in parallel. In the operation process, according to the transmission power and by means of the capacitor voltage of the high-voltage side of each power module, part of the power modules are alternately selected to be put into operation, and switching devices of the other power modules are locked. Compared with the prior art, the operation loss of the power semiconductor device can be effectively reduced, so that the electric energy transmission efficiency of the system is improved.

A high-power coupler formed from a substrate, such as a dielectric printed circuit board, is disclosed. The through arm and coupled arm(s) of the coupler have a conductor plated on the top, bottom and edges of the dielectric printed circuit board, completely enclosing the dielectric material in the conductor. A metal package surrounding the coupler forms the outer ground. Thin non-conductive struts of the dielectric material of the printed circuit board interconnect the separate arms of the coupler. The coupler may be integrated with microstrip circuitry, such as switches and resistors.

The invention relates to an energy simulation system and method and electronic equipment. The system comprises a rectification module, an isolation module, an inverter, a sampling module, a control module, a driving module and a power supply module, the rectification module is connected with the input end of the inverter through the isolation module. Wherein the input end of the sampling module isconnected with the output end of the isolation module, the output end of the sampling module is connected with the input end of the control module, the output end of the control module is connected with the input end of the driving module, the output end of the driving module is connected with the isolation module, and the power module is connected with the driving module and the control module.According to the invention, the isolated passive clamp phase-shifting full-bridge circuit is used as a main circuit, so that high-power operation and a wide voltage regulation range can be realized, electrical isolation protection of the inverter is realized, and the safety performance of the system is enhanced. And a table look-up mode is adopted as a photovoltaic characteristic curve simulationmode, so that the quick responsiveness of simulating the photovoltaic characteristic curve is improved, and a large amount of storage space does not need to be occupied.

The invention discloses a high-power mode-locked disc laser in the technical field of lasers. The high-power mode-locked disc laser has the advantages of being high in average power, simple in structure, good in system stability and the like. A disc laser gain medium, a first concave reflector, a second concave reflector and an output end coupling mirror form a mode-locked laser resonant cavity, and a Kerr medium and a diaphragm are arranged in the mode-locked laser resonant cavity; the Kerr medium is located between the first concave reflector and the second concave reflector, and the first concave reflector and the second concave reflector form a focusing cavity structure; pump light emitted by the pump source goes back and forth on the disc laser gain medium for multiple times through a pump light shaping system, so that the pump light is fully absorbed by the disc laser gain medium. Laser generated by the disc laser gain medium passes through the first concave reflector, the Kerr medium, the second concave reflector, the diaphragm and the output end coupling mirror in sequence to achieve laser output.

A structure and a method for suppressing audio noise of electronic equipment are carried out by utilizing an audio noise suppressing structure to cover a periphery or a surface of the electronic equipment or circuits thereof. The audio noise suppressing structure mainly comprises zirconia and at least one oxide serving as a stabilizer. The zirconia and the oxide are evenly mixed and sintered with a high temperature to form an electrically conductive ceramic body. In use, because the audio noise suppressing structure is disposed on a periphery or a surface of the electronic equipment or the audio circuits thereof, the electrification of the electronic equipment or audio circuits create shunt conductance, far infrared radiations and a resonance effect to reduce the thermal accumulation. Thus, the accumulated heat possibly caused by working the electronic equipment is reduced or fully dispersed, thereby attaining a decrease in the noise.

The embodiment of the invention discloses a field-programmable gate array device and a memory power supply control method therein, in the field-programmable gate array device, a power-off signal port and a sleep signal port are additionally arranged on a memory so that can flexibly switch among a low-power-consumption state, a high-power-consumption state, a full-enabling state and a full-power-off state according to a power-off signal and a sleep signal. The memory does not need to work in a full-enabling state all the time so that the power consumption of the memory in the field programmable gate array device is greatly reduced. Therefore, the problems that the working temperature of the field programmable gate array device is too high and heat dissipation is difficult are solved.

Disclosed is a metal-oxide-semiconductor field-effect transistor layout structure, which employs a common drain area having a right cross-shaped pattern and at least two common drain areas having tartan design, and a mixed array having a right cross-shaped pattern common drain area and a right cross-shaped pattern common source electrode which are formed by a common source electrode area having a right cross-shaped pattern and at least two common source electrode areas having tartan design. The metal-oxide-semiconductor field-effect transistor layout structure can improve the assembly density of the conventional layout circuit and promote the width of the efficient information channel thereof, thereby realizing the objective of reducing the cost and operation with higher power.

The invention discloses an expressway pavement sweeper which comprises a sweeper body, a garbage can body, a tail sweeping mechanism, a track frame, a water tank, a fan, a front sweeping disc brush and an auxiliary engine. The track frame is fixed below a chassis of the vehicle body; the garbage can body, the fan, the water tank and the auxiliary engine are fixed to the upper side of a chassis of the vehicle body. The tail cleaning mechanism is communicated with a lower dust suction pipe on the track frame through a pipeline, and the lower dust suction pipe is communicated with an upper dust suction pipe of the garbage can body through a pipeline; the water tank is respectively communicated with the sucking disc main body and the high-pressure water nozzles on the front disc sweeping brush through pipelines; the auxiliary engine drives the fan to work; a PLC is arranged in a cab of the vehicle body and used for controlling the power assembly to conduct corresponding actions. The sweeping vehicle provided by the invention has the sweeping effect up to 95% and comprehensive adaptability, meanwhile, the sweeping efficiency is 2-3 times that of a traditional sweeping vehicle, and the sweeping vehicle has corresponding energy-saving and emission-reducing effects.

The invention discloses a ventilation air methane comprehensive energy power generation system. The system comprises a double-pipeline gas power generation system and a photovoltaic power generation system, the double-pipeline gas power generation system and the photovoltaic power generation system are connected to a load through a busbar to supply power to the load; the load is also connected with an external power grid through the bus bar; a power meter is arranged at the external power grid; the power meter, the photovoltaic power generation system and the double-pipeline gas power generation system are all connected to the central controller; the power meter is used for detecting and acquiring a power factor at a grid-connected point of the external power grid; the power factor is sentto the central controller; the central controller is used for receiving the power factor sent by the power meter, controlling the gas inflow of the gas power generation system according to the powerfactor value, and adjusting the photovoltaic power generation system. The power factor can be automatically adjusted; gas and photovoltaic power generation systems are coordinated in a unified manner,the grid-connected point power factor is flexibly controlled, the energy comprehensive utilization rate is improved, the energy conservation and emission reduction are realized, and the two gas inletpipelines can ensure the stable operation of the gas generator set.

The heating system for a sauna comprises an oven and an accumulator. The heating system is electrically connectable to a mains which provides a first electrical power. The accumulator is provided to provide a second electrical power. The oven is operable with the first and second electrical powers to increase the thermal power.