81results about How to "Reduce the number of modules" patented technology

The invention belongs to the technical field of power electrons and particularly relates to a modularized multi-level full-bridge resonant power electronic transformer topology. The topology specifically comprises high-voltage side three phases which are of three-phase star connection structures, each phase is of the same structure, and each phase comprises Nt subunits and Nt low-voltage side full-bridge modules; each subunit comprises a resonance LC and a high-frequency transformer, and a high-voltage side MMC full-bridge module of each phase is shown in the description; in every two adjacent subunits, each MMC module generates a part of the base frequency phase voltage output and produces a high-frequency square wave with equal production amplitude and opposite phases at the same time, the high-frequency square wave is filtered and passes through bridge arm resonance LC, and after being separated and reduced voltage by the high-frequency transformer, the high-frequency square wave is rectified by a low-voltage side H bridge module to a low-voltage direct current bus. Compared with the high-voltage side and intermediate topology of a traditional power electronic transformer, the high-frequency transformer number, module number, capacitance number and switch number can be saved, and the topology has a good output waveform at the same time.

The invention belongs to the field of electrical power systems, and particularly relates to a pulse width modulation method for a modularization multi-level converter. The modularization multi-level converter (MMC) is composed of three phases and six bridge arms, each bridge arm comprises n sub-modules and an alternating current reactor, and the n sub-modules are successively connected in series. Each sub-module comprises two insulated gate bipolar translator (IGBT), a half-bridge structure and a capacitor, anti-parallel diodes of the IGBT constitute the half-bridge structure, and the half-bridge structure is connected with the capacitor in parallel. The pulse width modulation method includes the following steps: A three-phase saddle-shaped modulating waves are produced; B the saddle-shaped modulating waves and triangle carrier waves are compared to produce pulse-width modulation (PWM) signals; and C the PWM signals are used for controlling the MMC. The method has the advantages of achieving on-line computation easily, achieving engineering simply, being high in direct voltage use ratio, being capable of reducing the quantity of modules in the same voltage power level, and capable of lowering cost, and being obvious in effect when volume is large.

The embodiment of the invention discloses a power supply circuit, and relates to the technical field of power supply, wherein the power supply circuit comprises an adjusting unit and a plurality of packaging units; the plurality of packaging units are connected between a power supply end and the ground in series; each packaging unit comprises one or more sets of components; each set of components comprises a connected chip to be powered and an auxiliary power supply unit; a signal level conversion unit is respectively connected between the chips to be powered in two sets of adjacent components in series; various chips to be powered are respectively connected to the adjusting unit; the adjusting unit performs temperature or frequency adjustment of the various chips to be powered according to the working states of the various chips to be powered; and thus, all the chips to be powered in the power supply circuit are in a normal working state. By means of the embodiment of the invention, the design production cost can be reduced; the problem of low power supply energy conversion efficiency can be effectively overcome; furthermore, the volume of a PCB also can be reduced; and thus, the working voltage of the various chips to be powered is balanced.

The invention discloses a vehicular night curve auxiliary and vision enhancing device, which comprises a follow-up steering illuminating subsystem, an infrared night viewing subsystem, an embedded processing control platform and an LCD (liquid crystal display) screen. The embedded processing control platform is used for acquiring and transmitting vehicular state information and calculating control quantity of the follow-up steering illuminating subsystem to control the follow-up steering illuminating subsystem, and further used for acquiring and processing video signals of the infrared night viewing subsystem. The embedded processing control platform is respectively connected with a vehicular CAN (controller area network) and the follow-up steering illuminating subsystem through CAN bus interfaces, and further connected with an infrared CCD (charge coupled device) camera through a video transmission cable/interface. The embedded processing control platform is connected with the LCD screen. By means of full utilization of the automobile electronic technique and the microelectronic technique and completely technical combination, the visual field is expanded for a driver driving at night, hazardous situation perceptual ability of the driver under adverse conditions can be improved, and accordingly night driving safety can be improved.

The invention provides a power semiconductor module and a power electronic device applying the same. The power semiconductor module comprises an upper bridge arm circuit, a box-shaped first outer shell for containing the upper bridge arm circuit, a lower bridge arm circuit and a box-shaped second outer shell for containing the lower bridge arm circuit, wherein the upper bridge arm circuit and the box-shaped first outer shell for containing the upper bridge arm circuit are independently packaged into a first module, and the lower bridge arm circuit and the box-shaped second outer shell for containing the lower bridge arm circuit are independently packaged into a second module, i.e. each phase of a three-level frequency converter formed by the semiconductor module provided by the invention only comprises two modules. Compared with the number of modules of each phase of the frequency converter in the prior art, the number of the modules of the frequency converter of the invention is reduced, circumscribed connecting circuits needed between the modules are reduced, the power consumption of each module is further reduced, and at the same time the size of the mutually connected circuits of the three-level frequency converter formed by the semiconductor module provided by the invention is reduced, so that the cost of manufacture is reduced.

The invention discloses a voltage fast detection algorithm suitable for a grid power system low voltage ride through function. The voltage fast detection algorithm suitable for the grid power system low voltage ride through function comprises the following steps: (1) acquiring amplitude value information under the normal operation of a power grid based on a phase-locked loop of a synchronous reference coordinate frame, (2) separating the voltage of a sampled power grid into three-phase of A, B, C, conducting a period of delay to the sampled power grid, and acquiring the absolute value of an difference value, (3) setting a voltage threshold value and comparing the difference value in the step (2) with the voltage threshold value, (4) if the difference value is smaller than the voltage threshold value, then judging that the voltage is normal, if the difference value is larger than the voltage threshold value, then turning to step (5), (5) sending real-time voltage signals into a maximum value tracking module and an over zero point tracking module through each of the phrases of voltage, after judging that the system enters into a low voltage status, and (6) recording the maximum value tracking module and the over zero point tracking module to acquire an amplitude value after the voltage of the power gird drops.

The embodiment of the invention discloses a power supply circuit, a virtual digital currency mining machine and a computer server, and relates to the technical field of power supply. The power supply circuit is characterized in that a plurality of packaging units are connected in series between a power supply end and the ground; each packaging unit comprises one or more groups of elements; each group of elements comprises a chip to be supplied with power and an auxiliary power supply unit which are connected with each other; and a signal level conversion unit is connected in series between the chips to be supplied with power in two groups of adjacent elements. Through adoption of the power supply circuit, the virtual digital currency mining machine and the computer server, the design and production cost can be lowered; the problem of low power energy conversion efficiency is solved effectively; and the PCB (Printed Circuit Board) size can be reduced.

The invention provides a modular air conditioning and purifying machine. The modular air conditioning and purifying machine is formed by connection of a modular functional device through a pipeline. The modular functional device comprises one or more power modules, a plurality of two-way air duct modules and one or more air inlet and outlet head modules, and the modular functional device can also comprise an energy-saving module. According to the modular air conditioning and purifying machine, functions are separated and modular design is achieved, the indoor and / or outdoor air can be purified, and the functional modules can be flexibly combined and replaced to adapt to use occasions with different area sizes and purify different pollution sources.

The invention discloses a hydraulic formwork trolley for rail top air duct post-pouring construction. The hydraulic formwork trolley mainly comprises a support system and a formwork system connected to the upper end of the support system, the formwork system comprises a bottom formwork, an inner side moving formwork and an outer side moving formwork which are hinged to the two sides of the bottom formwork and a formwork collecting oil cylinder. The bottom formwork, the inner side moving formwork and the outer side moving formwork are all integral parts, the number of modules is small, and the concrete forming effect is good. The support system comprises a support and an automatic lifting mechanism and an automatic walking mechanism which are at the bottom of the support, the automatic lifting mechanism achieves integral lifting of the trolley, and the automatic walking mechanism achieves integral longitudinal movement. Hinged assembling is quick and high in efficiency, large lifting equipment is not needed, the occupied space is less, and narrow underground construction requirements can be met. After a section is poured, the outer side moving formwork and the inner side moving formwork are rotated to be open through the formwork collecting oil cylinder to get away from the concrete, the height of the support system is controlled to be lowered to enable the bottom formwork to get away from the concrete, the trolley is directly controlled to move to the next to-be-poured section, and corresponding formwork erection operation can be conducted.

The invention relates to an oilfield oil sludge treatment novel process, and aims at providing an oilfield oil sludge treatment novel process with which no agent is needed to be added, oil content in oil sludge can be lower than a national standard, and mass production can be realized. According to the invention, oil sludge and water with an amount 2-4 times that of the oil sludge are added into a heating and stirring tank, and are heated to a temperature of 60-80 DEG C; a mixture of oil sludge and water is added into a high-speed horizontal oil sludge special-purposed centrifuge, such that oil is separated from sediment water; water for diluting and a flocculating agent with weight 1/40 to 1/60 that of the oil sludge are added to the sediment water, and water is separated through a two-phase sewage horizontal screw centrifuge, wherein the amount of added water is 3-5 times that of water added in the step (1); and an obtained mud cake reaches a standard and can be discharged.

The invention, which belongs to the field of intelligent driving, particularly relates to a method for assisting a driver in crossing a traffic light. The invention provides a method of determining whether a driver can drive the vehicle to pass the traffic light within green light time. Accidents occur frequently at the traffic light intersection because drivers can not determine whether the motorvehicles can pass the intersections successfully within the residual green light time accurately. Many drivers notice that the traffic lights become red light states when arriving at the intersections but can not stop the vehicles timely due to the high speeds, so that the vehicles collide with vehicles from the other sides; and if the vehicle drivers can be informed of the result of determiningwhether the vehicles can pass traffic lights successfully in advance before arriving at the traffic light intersections, the drivers can be assisted well.

The invention discloses a classification model establishment method based on dynamic joint distribution alignment and application thereof, and belongs to the field of domain adaptation, and the method comprises the following steps: weighting samples in a source domain data set and a target domain data set respectively, and enabling category distribution to be the same; inputting samples in the two data sets into a joint distribution alignment model, and calculating loss, wherein the joint distribution alignment model comprises: a feature extractor used for extracting features of an input sample; the feature discriminator that is used for judging the source of the features extracted by the feature extractor; the classifier that is used for classifying the features extracted by the feature extractor to generate corresponding category labels; and the category discriminator that is used for judging the source of the category label generated by the classifier; after updating the joint distribution alignment model according to the loss, labeling a pseudo label for a sample in the target domain data set to update a sample weight; after iterative training is finished, forming a classification model by a feature extractor and a classifier. The problem of lack of training data can be solved, and training resources and time are reduced.

The invention relates to an MMC and full bridge structure based middle and low voltage transformer and a control strategy thereof. A modularized multilevel transverter serves as an inversion device ina middle-voltage bus to AC link, so that the middle voltage side of a DC/DC converter has a better transmission characteristic and higher reliability; a full bridge structure is used in the low voltage side, the structure is simple, and control is convenient; and the different transformers are connected in series to reduce the voltage level of the transformers, and are connected in parallel to improve the power transmission capability of the system, and energy is transmitted to low-voltage buses of low voltage levels. The voltage level of the AC bus can be changed flexibly according to requirements by means of an improved square wave modulation method. A provided topology is more suitable for a present application scene of the middle and low voltage distribution network. A modulation strategy with the topology can reduce the voltage level in the AC link and reduce the voltage stress of a transformer device; the number of modules needed by the system is reduced greatly under the same voltage level, and the cost is reduced; and a good voltage sharing effect is achieved.

The invention belongs to the field of intelligent parking. The invention discloses a parking image processing method, a device and a system based on an enhancement server, comprising a camera group, which is used for continuously shooting images of a monitoring area; a local controller, configured to perform differential processing on the image of the monitoring area, and extract an image suspected of being a vehicle entering and exiting the yard and configuration information of a parking space in the image; an enhancement server configured to obtain a judgment result of a vehicle state according to an image suspected of being a vehicle entering and exiting the yard and configuration information of a parking space in the image, and to match the judgment result of the vehicle state with a corresponding image suspected of being a vehicle entering and exiting the yard and configuration information of a parking space in the image for marking. The local controller is also used for performing parking state confirmation and synthesizing vehicle parking event information. The invention processes the parking data through the local controller and the enhancement server respectively, which not only improves the judgment accuracy and the processing speed of the parking event, but also reduces the hardware cost, the installation cost and the maintenance cost of the local controller.

The invention belongs to the technical field of petroleum drilling fluid solid controlling processing devices and particularly relates to a slurry transferring device for drilling fluid. The device comprises a slurry transferring tank (1). A drilling fluid inlet (10) is formed in the top of the slurry transferring tank (1). The device is characterized in that a first sand pump (2) and a second sand pump (3) are connected with the bottom of the slurry transferring tank (1). An outlet of the first sand pump (2) is connected with a first automatic control valve (6), the first automatic control valve (6) is connected with a programmable logic controller (PLC) control system (5) through a first executor (8), an outlet of the second sand pump (3) is connected with a second automatic control valve (7), and the second automatic control valve (7) is connected with the PLC control system (5) through a second executor (9). By means of the slurry transferring device, when a drill machine main body is transferred, the number of modules of the drilling fluid solid controlling system translated as a whole is reduced, drilling fluid transferring and loss are avoided, and efficiency is improved.

The invention embodiment provides an implementing method and apparatus of multiple-aerial intermediate radio frequency module. n receiving and n transmitting intermediate radio frequency modules are dismantled into m receiving and m transmitting intermediate radio frequency modules; wherein, n and m are all integers, and n is integer times of m; the dismantled m receiving and m transmitting intermediate radio frequency module are used by single, or used for switching with each other by configuring the n receiving and the n transmitting intermediate radio frequency modules, thereby reducing the module amounts and improving the module integration degree; meanwhile, when the present network is upgraded, only the corresponding modules are increased without changing the whole module in the present network, thereby the configuration is more flexible, and the system performance is improved.