20results about How to "Reduce cooling requirements" patented technology

The utility model relates to the field of inverter welding machines, in particular to a high-power-density welding machine power supply based on silicon carbide full-bridge inverter type double parallel inverters, which comprises a rear panel component, an upper connecting plate component, a first silicon carbide inverter component, a second silicon carbide inverter component, a front panel component and a bottom plate component. The rear panel part comprises an input switch and a cooling fan; the upper connecting plate component comprises an auxiliary power transformer, a main control board, a driving board and a rectifying and filtering device; the first silicon carbide inverter assembly comprises a first silicon carbide inverter plate, a radiator, a first high-frequency transformer, a secondary rectifying plate and a radiator; the second silicon carbide inverter assembly comprises a second silicon carbide inverter plate, a radiator, a second high-frequency transformer, a secondary rectifying plate and a radiator. Based on the innovation and change, the size and the weight of the power supply of the high-power output inverter welding machine can be greatly reduced, high power density is achieved, the production cost is reduced, and the use requirement of market portability is met.

The invention relates to the technical field of industrial tail gas treatment, and provides a carbon dioxide separation and capture system which comprises a vortex tube assembly at least comprising a first vortex tube and a second vortex tube, an inlet of the first vortex tube is used for introducing gas, and a cold end outlet of the first vortex tube is connected with an inlet of the second vortex tube; a cold end outlet of the second vortex tube is sequentially connected with a condenser and a gas-liquid separation device through a pipeline; the gas-liquid separation device is provided with a gas outlet and a liquid outlet; the heat exchanger is provided with a cold fluid inlet and a hot fluid inlet, the cold fluid inlet is connected with the liquid outlet through a pipeline, the hot fluid inlet is simultaneously connected with a hot end outlet of the first vortex tube and a hot end outlet of the second vortex tube through pipelines, and the heat exchanger is further provided with a cold fluid outlet; the storage tank is connected with a cold fluid outlet of the heat exchanger and used for storing liquid carbon dioxide; the cold energy is fully utilized while the carbon dioxide storage difficulty is reduced, and the overall energy utilization efficiency of the system is improved.

The utility model relates to an anti-condensation heating control device and a refrigerator. The anti-condensation heating control device comprises a control module and a condensation detection module. The control module comprises a comparator and a relay, the first output end of the comparator is electrically connected with the relay, and the relay is electrically connected with the heating device; the moisture condensation detection module comprises a first moisture condensation detection unit and a second moisture condensation detection unit, the first moisture condensation detection unit is electrically connected with the first input end of the comparator, and the second moisture condensation detection unit is electrically connected with the second input end of the comparator; the first condensation detection unit is used for detecting the surface humidity of cabinet door glass and outputting a first voltage to the comparator; the second condensation detection unit is used for detecting environment humidity and outputting a second voltage to the comparator; the comparator is used for controlling on or off of the relay. Through the arrangement, compared with a single chip microcomputer, the comparator has the advantages of being low in price and high in anti-interference performance, the requirements for the performance of a power supply, electromagnetic shielding and heat dissipation of the whole machine are lowered, and the cost of the whole machine is lowered.

The utility model discloses an asymmetric cooperative control three-phase balance motor soft starter, comprising a three-phase AC power supply input end, a power adjusting unit, an output end connected to a three-phase asynchronous motor, and a main controller which are connected in sequence. The power adjusting unit comprises an A-phase control module which is internally provided with a first thyristor at least controlled by a main controller; the B-phase control module is internally provided with a pair of antiparallel second thyristors controlled by the main controller; and the C-phase control module is internally provided with a pair of third thyristors which are controlled by the main controller and are reversely connected in parallel. The main controller cooperatively controls the conduction angles of the first thyristor, the second thyristor pair and the third thyristor pair in the starting process of the motor by outputting a control signal so as to adjust the voltage applied to the motor and improve the balance of the three-phase output voltage. According to the utility model, the three phases are controlled, so that the three-phase balance during starting is effectively improved, and the vibration and noise of the motor are reduced.

The utility model provides a kind of air conditioner soft-start control system, air conditioner starting interface, current detection module, power control unit, bypass unit, temperature detection module, through bypass unit through soft-start, start smooth, reliable operation, when magnetic retainer B is attracted, the trigger signal of thyristor SCR3, thyristor SCR4 is removed, thyristor SCR3, thyristor SCR4 stop conducting, compared with traditional contactor in entire bypass conduction period needs to continue coil power supply, can realize significant energy saving, system long-term operation total energy consumption is greatly reduced, while avoiding coil continuous heating problem, it is favorable to improve system overall reliability and reduce heat dissipation demand;While setting phase-loss protection module, distinguish zero line loss and fire line loss etc. Fault type, accurate trigger protection and store fault code, diagnosis is convenient.

The invention discloses a fuel cell hybrid power control system, which comprises a power cell negative electrode bus, a power cell positive electrode bus, a fuel cell negative electrode bus, a fuel cell positive electrode bus and a motor, each motor winding connecting end is respectively connected with a power battery cathode bus, a power battery anode bus, a fuel cell cathode bus and a fuel cell anode bus through an independent electronic switch; each electronic switch is provided with a control signal end. A DCDC direct current transformer and a motor controller are mutually combined, a six-path full-bridge motor control circuit and a Buck Boost Buck-Boost direct current transformation circuit are mutually combined, and a motor coil is also used as an energy storage coil of the direct current transformer, so that the structure is simplified, the size, weight and cost of the energy storage coil are reduced, and the corresponding energy loss and heat dissipation requirements of the energy storage coil are reduced.

The embodiment of the invention provides projection equipment, a laser television and a vehicle, the projection equipment comprises an MEMS galvanometer chip, the MEMS galvanometer chip adopts silicon carbide as a chip substrate, and compared with a silicon-based chip, the silicon carbide has the characteristics of high thermal conductivity, high forbidden band width and the like, and the MEMS galvanometer chip has the advantages of high thermal conductivity and high forbidden band width. According to the MEMS galvanometer chip, the rotating suspension beam integrated with the mirror surface in the projection equipment using the MEMS galvanometer chip is not easy to damage at high temperature and low in heat dissipation requirement, the problems caused by working temperature rise such as fusing of the rotating suspension beam are avoided, the projection equipment has better environment adaptability, the heat dissipation requirement is low, the heat dissipation structure can be reduced, and the projection equipment is more miniaturized.

The application discloses a switching type frequency elimination flash circuit, comprising a filter capacitor for accessing the pulsed direct current of an adjustable light constant current circuit output, an adjustable constant current circuit for converting the direct current voltage output by the filter capacitor into direct current to drive an LED light emitting circuit to emit light, and a signal conversion circuit for generating a corresponding adjustment signal according to the average value of the voltage signal output by the filter capacitor, so as to control the adjustable constant current circuit to convert the input voltage connected thereto into corresponding direct current output in a switching conversion mode; the circuit has the advantages of high conversion efficiency, low cost, and low heat dissipation requirement.

The application discloses a memory testing device, method, electronic equipment and storage medium, and relates to the technical field of computers.The device comprises a field programmable logic gate array module, a memory controller module and a memory module; the field programmable logic gate array module is used for receiving instructions of a testing end and delivering the instructions and test cases to the memory controller module; the memory controller module is used for training and / or testing a memory to be tested according to the instructions and returning training results and / or test results to the field programmable logic gate array module; and the field programmable logic gate array module is further used for receiving the training results and / or test results to obtain analysis results, and sending the training results and / or test results and the analysis results to the testing end.The application can reduce the demand of testing on a hardware environment, reduce the use threshold and reduce the cost.

The present invention is applicable to the technical field of audio power amplifiers, and provides a class D audio power amplifier and a signal compression method. The class D audio power amplifier includes: a controllable limiter, a class D amplifier, a first filter, a second filter, and a logic control module. In the present application, when an abnormal signal appears in the filtered signal, the logic control module compresses the filtered signal to reduce the amplitude of the abnormal signal in the filtered signal, that is, the compression processing of the abnormal signal effectively reduces the compression and distortion phenomenon of the class D audio power amplifier when processing low-frequency signals, improves the sound quality performance of the audio amplifier, and the audio power amplifier device is smaller in size and lighter in weight, which is easy to carry and install. In addition, the circuit structure of the present application has high energy conversion efficiency, which can effectively reduce the energy consumption of the power amplifier device and reduce the waste of electric energy, while reducing heat generation, reducing heat dissipation requirements, and improving the stability and life of the equipment.

The application discloses a liquid metal-phase change working medium composite type temperature equalizing cold plate and belongs to the technical field of electronic equipment heat dissipation. The device comprises a shell, a first flow channel, a second flow channel, an evaporation cavity, a condensation cavity, a partition plate and a filling port. The liquid metal flows inside the first flow channel to absorb heat. The first flow channel is internally provided with the partition plate. The liquid metal changes the flow direction at the partition plate and enters the second flow channel to release heat. The second flow channel is staggered with the evaporation cavity. The phase change working medium inside the evaporation cavity absorbs the heat transferred by the liquid metal inside the second flow channel. The steam formed by the evaporation of the working medium is condensed on the wall surface of the condensation cavity. The condensed liquid working medium flows back to the evaporation cavity through the inclined wall surface. The filling port is communicated with the condensation cavity and can adjust the pressure of the phase change working medium by filling and discharging the working medium. The application combines the liquid metal with the phase change heat transfer, effectively suppresses the temperature rise in the heat exchange process of the liquid metal, improves the temperature equalization of the electronic equipment and enhances the reliability of the equipment.

The utility model relates to a product extraction device for producing acetone through synthesis gas pressure fermentation, which comprises a synthesis gas pressure fermentation tank, a membrane filtration unit, a reduced pressure flash tank, a gas condensation pipe and an acetone storage tank, a liquid inlet of the membrane filtration unit is communicated with a fermentation liquid discharge port, and a reflux inlet of the membrane filtration unit is communicated with the fermentation tank; a liquid inlet of the reduced-pressure flash evaporation pipe is communicated with a liquid outlet of the membrane filtration unit; a gas inlet of the gas condensation pipe is communicated with a vapor phase outlet of the vacuum flash tank; and a condensate outlet of the gas condensation pipe is communicated with an acetone storage tank. According to the product extraction device, firstly, thalli of fermentation liquor are intercepted through the membrane filtration unit, the activity of the thalli is reserved, and the influence on the activity of the thalli is low; according to the invention, acetone is used as a raw material, then the reduced pressure flash tank is used for reducing the pressure of the fermentation liquid and then flash evaporation is carried out, the temperature is maintained at 60 DEG C by using fermentation waste heat, so that the acetone is rapidly vaporized to form gas-liquid two-phase flow, and the design not only improves the vaporization efficiency of the acetone, but also reduces the additional cooling requirement and reduces the energy consumption.

The invention discloses a laser depilation control and depilation instrument supporting sliding type continuous treatment, and relates to the field of beauty instruments. The method comprises the steps that in the process of moving a treatment head, skin images are collected in real time to obtain continuous image frames, and the linear acceleration and the angular velocity of the treatment head are collected; performing hair follicle target recognition on the image frame, extracting the position of a hair follicle, generating a data packet containing a timestamp and a target coordinate, and inserting the data packet into a task queue according to the timestamp; according to the linear acceleration and the angular velocity, the instantaneous velocity and the motion direction vector of the treatment head relative to the skin are obtained; and sequentially reading the data packets from the task queue, extracting target point coordinates from the data packets to perform laser irradiation, and performing fine adjustment compensation on the laser irradiation position according to the instantaneous speed and the motion direction vector. A sliding continuous treatment scheme is provided, and efficient, comfortable and quiet hair removal experience is achieved.

The invention discloses a reference voltage logic circuit, which is characterized by comprising a voltage comparison circuit, a reference voltage generation circuit and a reference voltage generation circuit, judging whether the voltages of all the feedback signals are higher than a first set voltage so as to determine the logic potential of an output point A and judging whether the voltage of at least one feedback signal is lower than a second set voltage so as to determine the logic potential of an output point B; the voltage selection logic circuit outputs a plurality of control signals according to the logic potentials of the output point A and the output point B; the voltage regulation logic circuit outputs a new reference voltage according to the plurality of control signals, when the voltages of all the feedback signals are higher than the first set voltage, the new reference voltage is lower than the old reference voltage, and when the voltage of at least one feedback signal is lower than the second set voltage VL, the new reference voltage is lower than the old reference voltage. The new reference voltage is higher than the old reference voltage, and the first set voltage is higher than the second set voltage.

The utility model discloses a built-in heat dissipation type geometric projection lamp which comprises a heat dissipation shell, a light source module is installed in the heat dissipation shell, a light-transmitting cover body is further installed on the upper portion of the heat dissipation shell, heat dissipation fins are arranged on the inner wall of the heat dissipation shell, an annular gap is formed in the middle of the heat dissipation shell, and the annular gap is communicated with an inner cavity of the heat dissipation shell. A bottom cover is mounted at the bottom of the heat dissipation shell; an electric appliance shell is further arranged on the lower portion of the heat dissipation shell, a power source assembly is installed in the electric appliance shell and electrically connected with the light source module, and an electric appliance cover is installed on the lower portion of the electric appliance shell. According to the geometric projection lamp, the light source module and the power source assembly are arranged in a split mode, mutual cross influence of a light source and a heat source of a power source when the geometric projection lamp is used is avoided, on the basis, the cooling fins of the cooling shell can be arranged on the inner wall of the cooling shell, air convection cooling can be achieved only through the annular gaps, external cooling fins are not needed, and the heat dissipation efficiency is improved. And the radiating fins are prevented from influencing the attractiveness of the lamp body, so that the projection lamp can be used in an open mounting manner.

The utility model discloses a side entry type backlight module capable of reducing different colors, and relates to the technical field of backlight modules, the side entry type backlight module comprises a main body back plate, the periphery of the upper end of the main body back plate is fixedly provided with an edge folding coaming, and the inner side of the edge folding coaming is fixedly provided with a light bar assembly used for emitting a light source. A reflector plate is fixedly arranged at the upper end of the main body back plate, and a light guide plate is fixedly arranged at the upper end of the reflector plate; a quantum dot diffusion sheet is fixedly arranged at the upper end of the light guide plate, an upper diffusion sheet is fixedly arranged at the upper end of the quantum dot diffusion sheet, a display screen is arranged at the upper end of the upper diffusion sheet, an upper cover frame is fixedly arranged above the display screen, and the upper cover frame is fixedly installed on the periphery of the main body backboard; according to the utility model, the unpackaged blue light wafer is directly welded on the bonding pad of the PCB substrate, so that the risk of different colors caused by non-uniform mixing of fluorescent powder in the traditional LED packaging process is avoided.

This application provides an inverter system control circuit, method, inverter system, and electronic device. The control circuit actively switches the operating topology to a three-phase three-wire system by turning off the neutral line switch under grid-connected or off-grid conditions with a balanced load. This allows the inverter to operate with higher DC bus voltage utilization. Under the premise of outputting the same level of AC voltage, the DC bus voltage value can be correspondingly reduced. This means that the upstream photovoltaic boost circuit or battery converter does not need to provide excessively high voltage, thereby reducing the voltage stress on power semiconductor devices, helping to improve overall system efficiency, reduce losses, and potentially reduce heat dissipation requirements. Simultaneously, since the neutral line is isolated, the operating pressure in this mode can be alleviated, or even eliminated in some cases, simplifying control and reducing losses in this part of the circuit.

The invention discloses a nacelle wind-liquid conversion device which is installed in an external nacelle of an aircraft with the flight Mach number of 0.5-0.8 and the flight height of 5000-8000 m in a built-in mode, and the nacelle wind-liquid conversion device comprises a nacelle body structural part with an air entraining opening and an exhaust opening. An air-liquid heat exchanger, a liquid filter, an expansion type liquid storage tank, a micro liquid pump and an air-liquid conversion system data acquisition and upper computer communication box are arranged in the cabin body structural member. Compared with an existing reverse boosting type air circulation system and an evaporation circulation system, accessories such as a turbine and a compressor do not exist in the system, cold air introduced from a pod stamping opening is directly used for cooling cooling liquid, and although no ground cooling capacity exists, the refrigeration performance and the temperature control accuracy are lower than those of an evaporation refrigeration circulation system, and the cooling performance and the temperature control accuracy are not lower than those of the evaporation refrigeration circulation system. The application range is limited to a certain extent, but the device is simple in structure, low in cost and good in reliability, and still has wide application scenes on more nacelles or airborne electronic equipment.

The utility model discloses a laser scanning digital galvanometer motor feedback structure and a galvanometer motor in the technical field of galvanometer motors, the feedback structure comprises a motor rear cover, a motor shell, a motor shaft, a photoelectric plate, a grating disc, a reading head and a screw, the motor rear cover directly or indirectly covers a rear opening of the cylindrical motor shell; the photoelectric plate is perpendicular to the axis of the cylinder body and is arranged between the motor shaft and the motor rear cover, a gap is reserved between the photoelectric plate and the motor shaft, the grating disc is directly or indirectly arranged on the motor shaft by using a screw and coaxially rotates with the motor shaft, and the reading head is welded on the photoelectric plate by facing a track of the grating disc and also keeps a gap with the motor shaft. The grating disc is directly or indirectly fixed on the rear end face of the motor shaft by taking the axis point of the grating disc as the center of circle, the scheme solves the problem of poor fixation of the grating disc and the motor shaft in the prior art, and achieves the beneficial effects of enhancing the stability, improving the performance and simplifying the structure.

The invention discloses a high-heat-dissipation rectification unit module and a converter. According to the high-heat-dissipation rectification unit module, the input ends of two groups of three-phase bridge type rectification circuit modules are connected in parallel through an input copper bar assembly, and the output ends of the two groups of three-phase bridge type rectification circuit modules are respectively connected with an output copper bar assembly; the temperature sensor is arranged between the two groups of three-phase bridge rectifier circuit modules; the current detection module is arranged on the front side of the input copper bar assembly; the output current detection module is arranged on the rear side of the output copper bar assembly; the radiating fins are arranged below the radiator, and the fan is arranged perpendicular to the ventilation direction of the radiating fins. The two groups of three-phase bridge rectifier circuit modules are adopted to improve the total power of the unit, reduce the total manufacturing cost of the unit, reduce the heat dissipation requirement in unit area, and cooperate with the air-cooled heat dissipation fins with strong heat dissipation capability to realize high heat dissipation performance of the whole unit module, improve the environmental adaptability of the high heat dissipation rectifier unit module, and improve the service life of the high heat dissipation rectifier unit module. The device is more suitable for severe working conditions of engineering machinery.