19results about How to "Reduce power density" patented technology

The invention discloses a slice laser based on a topological structure dodging layer. The slice laser comprises a pumping system, a pumping light injection module and a composite dodging waveguide structure, pumping light generated by the pumping system enters the composite dodging waveguide structure through the pumping light injection module; the front end face of the composite dodging waveguide structure is plated with a pumping light wavelength high-reflective film and a laser wavelength antireflection film, and the rear end face of the composite dodging waveguide structure is plated with a pumping source wavelength and laser wavelength high-reflective film; the composite dodging waveguide structure comprises a slice gain medium, a topological structure dodging layer and a middle refractive index layer which are sequentially arranged from the front end face to the rear end face. The topological structure dodging layer is composed of a low-refractive-index material layer and a high-refractive-index material topological graph arranged on the low-refractive-index material layer; and the pump light injection module is fixed above the high refractive index material of the middle refractive index layer or the topological structure dodging layer. Pumping uniformity is improved fundamentally, high-order mode suppression and efficient fundamental mode extraction are facilitated, and output power and light beam quality are improved at the same time.

A single-chip integrated full bridge relates to the technical field of semiconductors. Comprising a second isolation layer, an epitaxial wafer and a first isolation layer which are arranged in sequence, and the epitaxial wafer comprises a first lightly-doped N region, a second lightly-doped N region, a third lightly-doped N region and a fourth lightly-doped N region; four transverse conductive diodes are integrated on a chip, the first anode and the second cathode form metal interconnection and are connected to one end of an alternating current power supply, the third cathode and the fourth anode form metal interconnection and are connected to the other end of the alternating current power supply, and the third anode and the second anode form electrical interconnection through packaging or a PCB and are connected to one end of a load. The first cathode and the fourth cathode form electrical interconnection through packaging or a PCB and are connected to one end of a load, only one chip needs to be packaged, the area of the chip is effectively utilized, the use amount of the chip can be reduced by three quarters by using the full-bridge rectification chip in the scheme, and the power density is four times that of a traditional full-bridge device.

The invention discloses a high-efficiency selective laser sintering method, which comprises at least one mixture of raw material powder including a low-melting-point binder and at least one laser beam for selective laser sintering; the melting point of the binder is m p , the decomposition temperature is b p , so that the laser beam irradiates the raw material of the mixture, the highest temperature of the raw material rises to T, the duration of the temperature is t, and the following conditions are met: #imgabs0# and m p <T<b p , t>0; this method allows the temperature of a larger range of raw material powder to be maintained in the range from melting point to decomposition point for a certain period of time, while making the temperature distribution and gradient tend to be uniform, so that the residual stress and deformation after laser sintering are smaller; and the beam irradiation with a larger irradiation area also ensures the improvement of laser sintering efficiency.

The invention discloses an electrode structure in a flow battery, and particularly relates to an electrode structure with bionic fish gill design in the flow battery, and an electrode main body forms a gill cavity-like structure; the flow channel I is used for allowing electrolyte to flow into the gill-cavity-like structure; the flow channel II is used for the electrolyte in the gill-cavity-like structure to flow out; a gill arch-like structure is arranged in the gill cavity-like structure and is used for guiding electrolyte convection; the gill filament-like structure is used for diffusion and mass transfer of reactants; and the gill-like small sheet structure is used for providing a large number of electrochemical reaction sites. The technical problems that the 3D printing integrated electrode structure design integrates the structure and functional characteristics of a bipolar plate and a porous electrode in a traditional flow battery, the packaging difficulty and the contact resistance of an electric pile unit in the flow battery are reduced, and the power density and the energy efficiency of the flow battery are improved are solved. The electrode structure is simpler and more efficient to manufacture, large-scale production is facilitated, and the production cost is reduced.

The invention discloses an all-fiber high-power narrow-linewidth laser long-distance transmission system and method. The system comprises a narrow-linewidth laser, a pumping source, a pumping beam combiner, a gain fiber, a cladding light stripper, a coupling device, a double-core fiber and an output device. The laser outputs initial laser, the initial laser and pumping source light are injected into the gain optical fiber through the beam combiner to form high-power laser, the stripper removes residual pumping light, the coupling device guides the laser into the double-core optical fiber, the laser is periodically coupled between fiber cores to disperse power density and suppress stimulated Brillouin scattering, and finally the laser is shaped and output through the output device. System devices are connected through an optical fiber fusion splicer, a passive double-core optical fiber is replaced by an active double-core optical fiber and can be applied to an optical fiber amplifier, and long-distance stable transmission is achieved.

The invention discloses a double-clad square chalcogenide fiber and a fiber grating preparation method based on the double-clad square chalcogenide fiber, and belongs to the technical field of intermediate infrared fiber devices. According to the double-cladding square chalcogenide optical fiber disclosed by the invention, the core layer is sequentially coated with the inner cladding and the outer cladding, the overall section shape is designed to be square, each side face of the square optical fiber is a plane, the core layer is sequentially coated with the inner cladding and the outer cladding, and the overall section shape is designed to be square, so that the double-cladding square chalcogenide optical fiber is obtained. Each side surface of the square optical fiber is a plane; based on the double-cladding square chalcogenide fiber, precise regulation and control of a laser focus in the fiber core can be realized, and the efficiency and quality of fiber grating inscribing are improved. Meanwhile, the plane structure on the other side of the optical fiber is utilized, real-time online monitoring can be carried out on the inscribing process, and the consistency and the performance stability of the grating are ensured; the invention has important application value in the technical fields of mid-infrared optical fiber sensing, nonlinear optics and laser.

The present invention belongs to the field of medical devices, and specifically discloses an LED package device with a uniform light cavity and a method for using the same. The device is composed of a uniform light cavity, a light emitting diode and an air pressure regulating device. The uniform light cavity is composed of a covering layer, a supporting member and a bottom layer; the covering layer and / or the bottom layer are plastic film parts. The air pressure regulating device is connected to the uniform light cavity. By evacuating or inflating, the pressure difference between the cavity and the atmospheric environment is changed, so that the plastic film part in a relaxed state is deformed to form an inwardly concave or outwardly convex air pressure type optical element. The concave surface and the convex surface are off-axis rotating paraboloids or quasi-conical surfaces. The covering layer is both a reflective surface of the uniform light cavity and a light output window. The light beam output by the light emitting diode array is reflected and diffusely reflected in the uniform light cavity and propagates along multiple paths. The output light spot forms an approximately uniform light intensity distribution on the skin, thereby reducing the probability of ultraviolet damage to DNA. The air pressure type hollow structure has a small dead weight, which improves user comfort.

The utility model discloses an instant heating type heating body assembly for drinking water equipment, which comprises a heating pipe, a water inlet end cover, a water outlet end cover and a heating electrode, the heating pipe is of a cylindrical structure, and the water inlet end cover and the water outlet end cover are respectively arranged at an inlet end and an outlet end of the heating pipe in a sealing fit mode. One end of the heating electrode is sleeved on the heating pipe, and the other end of the heating electrode is connected with an external power supply; a plurality of protruding parts are arranged on the inner wall of the heating pipe in the flowing direction, and every two adjacent protruding parts in the flowing direction are arranged in a staggered mode. According to the utility model, the lug bosses are arranged on the inner wall of the heating pipe, so that the direct effective contact area between the heating pipe and water is effectively increased, and the heating efficiency is improved; meanwhile, violent turbulent flow can be formed through the action of the protruding parts which are arranged in a staggered mode and water flow, so that generation of bubbles is effectively reduced, and the service life of the heating pipe is prolonged.

The invention relates to a heat exchanger and a water heating device having the same. A heat exchanger according to an embodiment of the present invention comprises: a heating member that includes a heating pattern of a predetermined shape and generates heat; and a main body part in which, when water flowing in through the inlet part flows to the outlet part along the flow path, heat exchange occurs due to heat generated by the heating member, thereby generating and discharging hot water, in which the heating pattern is divided into a plurality of sections formed to have different widths from each other.

The invention discloses a high-voltage asynchronous three-phase motor for a coal mining machine, and relates to the technical field of coal mining motors, the high-voltage asynchronous three-phase motor comprises a machine base, a front end cover and a rear end cover, a winding stator iron core is arranged in the machine base, the end part of the winding stator iron core is fixedly connected with the machine base, and a rotor is rotatably connected in the machine base through a rotating shaft; the bearing assembly comprises bearing chambers formed in the front end cover and the rear end cover, the two ends of the rotating shaft are rotationally connected with the bearing chambers through bearings, the bearing chambers are provided with isolator assemblies, the isolator assemblies comprise static rings fixedly connected with the bearing chambers, the rotating shaft is provided with driving rings, and oil seals are arranged between the static rings and the driving rings; the sealing effect is improved; the cooling assembly comprises a plurality of cooling water channels formed in the two sides of the machine base, the front end cover and the rear end cover are each provided with a circulating water channel and a bearing chamber water channel, and the circulating water channels communicate with the corresponding cooling water channels; the cooling and sealing effects can be effectively improved.

This application relates to the field of optical device technology, and discloses a Faraday rotator, its fabrication method, and an isolator. The Faraday rotator comprises multiple magneto-optical crystals and multiple heat-dissipating crystals, which are alternately stacked along the optical path. Embodiments of this application can overcome the thermal focus shift defect of the isolator without increasing the output beam diameter of the collimator.

The utility model provides a clothes processing device, and relates to the technical field of clothes cleaning. The clothes processing device can comprise the inner cylinder, the outer cylinder, the heating device and the electrolyzing device, the avoiding groove is formed in the outer cylinder, the heating device and the electrolyzing device are located on the front side and the rear side of the avoiding groove respectively, the electrolyzing device and the heating device are separated from each other, and therefore the size of an electrode of the electrolyzing device cannot be limited by the heating device, and the service life of the electrolyzing device is prolonged. The size of the electrode of the electrolysis device can be enlarged, so that the area of the electrolysis device is increased, the power density is reduced, and the problem of short service life or poor performance can be solved. And the possibility of contact between the electrolysis device and the heating device caused by installation errors or screw looseness is reduced, so that the risk of short circuit of the motor is reduced. Calcium and magnesium ions which are accumulated on the surface of the cathode of the electrolysis device and form precipitates due to long-time electrolysis are reduced, and reduction of electrode performance is slowed down.

The utility model discloses a skirting line type heater, which belongs to the technical field of heaters, and comprises a shell and a power supply access port, the shell is provided with an air inlet and an air outlet, the air inlet is positioned at the lower part of the shell, the air outlet is positioned at the upper part of the front side of the shell, an inclined guide plate is arranged in the air outlet, a heating pipe is arranged at the bottom of the shell, and the heating pipe is connected with the power supply access port. A plurality of cooling fins are evenly arranged on the heating pipe, the two ends of the heating pipe are fixed through end fixing pieces with buffer sleeves, and the middle of the heating pipe is fixed through middle fixing pieces with buffer sleeves. Through the flow guide plate of the air outlet, hot air is obliquely and transversely discharged from the air outlet in the variable direction, the heating pipe is fixed through the middle fixing piece with the buffer sleeve, the two ends of the heating pipe are fixed through the end fixing piece with the buffer sleeves, and when the heating pipe expands with heat and contracts with cold, due to the fact that the buffer sleeves can freely move, noise is lowered; the power density of the heating pipes is reduced through the at least two heating pipes, the service life is long, the heat efficiency is high, the temperature of the air outlet is low, and scalding caused by local overheat is avoided.

This invention provides a method and system for dynamic failure analysis and location of chips. The method includes the following steps: sending a test signal to a testing device; the test signal is used to control the testing device to perform a regional excitation operation; the regional excitation operation includes: sending a preset number of excitation signals to the chip under test (DUT) within each time window according to the sending order of the excitation signals; wherein, one excitation signal is used to activate a corresponding functional unit in the DUT, and functional units that do not receive an excitation signal are inactive; the preset number is less than the total number of functional units in the DUT; acquiring the state data corresponding to the activated functional unit; and forming a failure location result based on the state data. This invention reduces the instantaneous power consumption density of the DUT by regionalizing the signal, solving the problems of high cost and complex implementation of existing dynamic failure analysis and location methods for chips.

This application discloses an electric drive device and a vehicle. The electric drive device includes a housing, and a motor assembly, a transmission assembly, and an output assembly housed within the housing's internal space. The transmission assembly includes a planetary gear assembly and a drive shaft. The output shaft of the motor assembly, the planetary gear assembly, and the drive shaft are sequentially meshed on a first rotation axis. The output assembly is disposed along a second rotation axis and meshes with the drive shaft. The first and second rotation axes are parallel but not coincident. Thus, the drive shaft and the planetary gear assembly are connected in the direction of the first rotation axis and rotate on the first rotation axis via the output shaft. The output assembly meshes with the outer circumference of the drive shaft, causing the output assembly to rotate about a second rotation axis parallel to the first rotation axis. This reduces the torque of the output shaft, increases the transmission ratio of the electric drive device, and reduces the space occupied by the electric drive device, thereby enabling the electric drive device to achieve lower power density and smaller size.

The application discloses an LLC resonant converter, a power supply circuit and a method for generating an output voltage. The LLC resonant converter comprises a full-bridge switching circuit, a transformer, a resonant circuit and a bridge rectifier. The full-bridge switching circuit comprises a first transistor, a second transistor, a third transistor and a fourth transistor, the first ends of the first transistor and the third transistor are connected to a direct current input voltage, and the second ends of the first transistor and the third transistor are respectively connected to the first ends of the second transistor and the fourth transistor. The two ends of a secondary winding of the transformer are respectively connected to the second ends of the fourth transistor and the second transistor. The resonant circuit is connected between a first switching node formed by the first transistor and the second transistor and a second switching node formed by the third transistor and the fourth transistor. The bridge rectifier is connected between the two ends of the secondary winding to generate a rectified output signal, and the rectified output signal is filtered to generate an output voltage. The application improves the efficiency of the LLC resonant converter.

The present disclosure relates to a display device for alleviating an efficiency reduction problem at a light load, and an operating method therefor, the display device comprising: a display; a power supply unit including a direct current (DC) / DC converter, which converts the level of DC power to supply same to a load; and a control unit for controlling the operating frequency of the DC / DC converter, wherein the control unit can change the resonance frequency of the DC / DC converter according to the load.

The application discloses a preparation method of an n-type gallium nitride-based GAA-HEMT inverter, and comprises the following steps: S1, growing aluminum oxide on a GaN single crystal substrate, etching the middle part of the barrier layer and depositing a metal gate; S2, etching the middle part of the gate to form a groove, depositing aluminum oxide, etching the middle and both sides of the aluminum oxide, growing GaN nanosheets in the etching area, doping Si after growing AlGaN nanosheets, growing GaN nanosheets to form p-GaN nanosheets by doping Mg; S3, etching the p-GaN nanosheets to make the width of the p-GaN nanosheets same as that of the gate, evaporating a metal film in the thickness direction of the two layers of nanosheets to prepare a source electrode and a drain electrode, growing aluminum oxide on the surface of the device to cover the p-GaN nanosheets and the AlGaN nanosheets, depositing a metal gate to cover the aluminum oxide to form an E-mode GaN; and S4, growing aluminum oxide, etching the middle part of the aluminum oxide to deposit a metal gate, and preparing GaN nanosheets, AlGaN nanosheets, a source electrode and a drain electrode in the manner of S2 and S3, growing aluminum oxide to cover the AlGaN nanosheets, depositing a metal gate to cover the aluminum oxide to obtain a D-mode GaN with a GAA structure.

The wafer multi-light-spot cutting system comprises a mixed light emitter, a light splitting assembly, a light combining assembly and a beam expanding assembly, mixed light beams emitted by the mixed light emitter at least comprise two kinds of light beams with different wavelengths, and the light splitting assembly can split the mixed light beams into 2n sub light beams, the 2n sub light beams can enter the beam expanding assembly, the beam expanding assembly can adjust the focuses of different light beams, and the 2n sub light beams can be combined into a cutting light beam with at least two focuses in the vertical direction after entering the light combining assembly. The invention further discloses a wafer multi-light-spot cutting method, the wafer is cut through the wafer multi-light-spot cutting system, multi-light-spot cutting can be carried out, light loss is small, longitudinal cutting is even, perpendicularity is high, the heat effect and stress concentration can be reduced, and therefore the yield is increased.