110results about How to "Reduce the maximum" patented technology

The invention discloses a dynamic discharge circuit and an LDO (Low Dropout Regulator) integrated with the same. The dynamic discharge circuit comprises a first error amplifier, a first MOS (Metal Oxide Semiconductor) tube and a first capacitor. The LDO comprises a second error amplifier, a second PMOS (P-channel Metal Oxide Semiconductor) tube, a second capacitor, a first resistor and a second resistor. The dynamic discharge circuit provided by the invention, under the premise of not significantly increasing the static power consumption, can detect the change of voltage at the output terminal when the LDO load jumps from heavy load to light load, and form a discharge channel for leading the output of the LDO to be grounded, thereby greatly reducing the uprush maximum of the output; and the LDO integrated with the dynamic discharge circuit can greatly reduce the uprush maximum of output voltage, thereby shortening the recovery time of the LDO circuit from a transient state to a steady state and improving the transient response of the LDO circuit.

The invention provides a feedback method of different long term evaluation-advanced (LTE-A) time division duplex (TDD) uplink and downlink proportions. In prior art, as for asymmetric uplink and downlink subframes in carrier aggregation scenes, an uplink subframe of each member carrier only feeds back acknowledgement character (ACK)/negative acknowledgement (Nack) of physical downlink shared channel (PDSCH) of the downlink subframe of the carrier and doesn't feed back ACK/ Nack of other carriers. According to the feedback method of different LTE-A TDD uplink and downlink proportions, as for asymmetric uplink and downlink subframes in a carrier aggregation scene, ACK/ Nack of the downlink subframe of each member carrier is fed back by an uplink subframe of an auxiliary cell with the minimum index, the uplink subframe is a nearest uplink subframe after at least four subframes, and ACK/ Nack of a plurality of carriers is allowed to be transmitted in other carriers. By means of the characteristic that uplink subframes are asymmetric when subframe proportions are different, the maximum value of the ACK/ Nack of the downlink PDSCH can be reduced, the ACK/ Nack of the downlink PDSCH is fed back in the uplink subframes, and time delay for the ACK/ Nack of the downlink subframe to feed back to an evolved node base (eNB) is reduced.

A method for preparing a green and high-efficiency composite flocculant, which uses plant fibrous waste and inorganic aluminum salts as raw materials, uses sodium hydroxide as an alkalizing agent, chloroacetic acid as an etherifying agent, and uses inorganic aluminum salts as a matrix basic material. Composite flocculant composed of natural organic matter and inorganic aluminum salt, the steps are as follows: 1) alkalinize plant fibrous waste with sodium hydroxide solution; 2) add chloroacetic acid aqueous solution for etherification; 3) finally add inorganic aluminum salt aqueous solution for Composite reaction to obtain a gray-brown liquid composite flocculant. The advantages of the present invention are: good flocculation effect, no secondary pollution, good ecological safety; simple preparation method, mild reaction conditions, easy to scale up to realize industrial production; good economic performance, low cost, wide source of synthetic raw materials, conforming to circular economy, Requirements for clean production; a wide range of applications, suitable for a variety of industrial wastewater and domestic wastewater, and even industrial water supply, and can further expand the scope of use by adjusting the formula ratio.

The invention relates to a sensing material for detecting the halogenated hydrocarbon, which is characterized in that the center is the divalent platinum; the two ligands coordinated with the platinum are 2-phenylpyridine; and simultaneously, the phenyl is provided with the aryl substituent. The sensing material comprises platinum, 2-phenylpyridine ligands and aryl on the phenyl or oligomer and polymer further constructed by aryl. The aryl comprises the further constructed oligomer or polymer as well as ramification of aryl. The detection method is realized through detecting the change of the fluorescence intensity of the luminescent material by using fluorescence means. The provided luminescent material is applicable to the detection of the volatile halogenated hydrocarbon.

An apparatus and method for mounting a reflector antenna system on an outer surface of an aircraft which minimizes a swept arc of a main reflector. This allows the effective frontal area of the main reflector to be reduced such that a radome with a smaller frontal area can be employed to cover the antenna system. The preferred embodiments make use of a platform which rotates the main reflector about an azimuthal axis which is disposed forwardly of an axial center of the main reflector. In one embodiment, the azimuthal axis is located in a plane extending between the outermost lateral edges of the main reflector. In another embodiment the azimuthal axis is located forwardly of the outermost lateral edges of the main reflector.

The invention relates to a DFB laser diode having a lateral coupling, which comprises at least one semi-conductor substrate (10), at least one active layer (40) that is arranged on the semiconductor substrate, at least one ridge (70) that is arranged above the active layer (40), at least one periodic surface structure (110) that is arranged next to the ridge (70) above the active layer (40) and at least one wave guide layer (30, 50) comprising a thickness ≧1 μm that is arranged below and/or above the active layer.

The invention relates to a pulse width modulation method based on instantaneous minimum common-mode voltage superposition which belongs to the pulse width modulation control technical field of the power electronic transforming device. The method is characterized in that when an integrated circuit inputs a target voltage value of an instantaneous value form or a vector form, after coordinate conversion and the treatment of common-mode voltage removal, whether line voltage falls into the range from -VD to +VD is firstly taken as the condition to carry out an overmodulation judgment according to the output limit of an inversion device, wherein, VD is direct current bus voltage; if entering an overmodulation zone, phase-voltage target values are reduced with equal ratio to cause the line voltage to fall into the range from -VD to +VD; the obtained phase-voltage target values are both superposed with a minimum common-mode voltage falling into the range from -VD to +VD; then, each phase-voltage pulse width modulation duty cycle can be calculated. Compared with a space vector modulation method which is usually used at present, the method can cause the common-mode voltage to be reduced to the maximum extent to reach the minimum which can be reached by the method of the category in theory, and has simple calculation process.

The invention discloses a low power consumption architecture system of an ultra-high frequency passive RFID digital baseband. The system comprises a radio frequency analog front end, a digital baseband processor part and a memorizer; the radio frequency analog front end is mainly used for converting AC radio frequency energy received by an antenna into DC energy available for other circuits of a label through a rectifying circuit, recovering data transmitted by a reader from the received radio frequency through a detection circuit, and producing a clock signal for driving the work of the digital baseband processor part through a clock production circuit, and modulating and sending the signal returned by the label; the protocol processing is performed through the main load of the digital baseband processor part; and the memorizer is used for memorizing related useful information. Through the improvement, the structure can effectively and uniformly distribute the power consumption of theelectronic label to the whole work time by combining with a power supply management mechanism including a gated clock, thereby reducing the maximum instant power consumption.

The invention discloses a time-division double-time-slot scheduling method of a large-span space-based data link, and aims to solve the problem of time slot scheduling of the space-based data link ina time division duplex working mode. The method implemented by the technical scheme comprises: simultaneously transmitting data packets in different regions by utilizing the spatial reusability of a directional narrow-beam antenna; dividing two parties communicating on one link into the same time slot to send messages to each other; planning the transmitting and receiving states of node antennas in a time division duplex working mode; planning the antennas of all nodes to be in a state of firstly transmitting and then receiving in one frame; when a signal is transmitted, enabling two communication parties to send services to each other at the same time, and controlling one antenna to be switched through a switch for transmission; when the signal is received, simultaneously switching the antenna to a receiving state; based on satellite spatial multiplexing and large-span propagation delay characteristics, transmitting services in different directions at the same time through time slot arrangement and transceiving state adjustment, and completing conflict-free data packet sending between neighbor nodes.

The invention discloses a system and a method for limiting rail potential of electrified railways in arid regions. The system comprises a traction substation, an autotransformer, a contact net, a positive feeder and a guard wire. A comprehensive grounding system is applied to the railways in the arid regions, a limiting scheme aiming for the rail potential of the electrified railways in the arid regions is provided, and for the railways in the arid regions, the guard line and a rail are sufficiently transversely connected in AT zones to reduce the rail potential; and through ground wires are led in to reduce rail potential in high-leak-resistance regions. For the railways in the arid regions, the guard wire and the rail are sufficiently transversely connect in the AT zones, so that the rail potential can be well reduced; due to leading in of the through ground wires, an effect of reducing the rail potential in the high-leak-resistance regions is obvious.

In a vehicle drive device comprising a differential mechanism and a motor provided therein, size of the drive device can be reduced, fuel consumption is improved, or occurrence of speed change shock is suppressed. Since an exchange clutch C0 or an exchange brake B0 is provided, a speed change mechanism (10) is switched between a variable speed state and a stepped speed state so as to obtain a drive device having both advantages of fuel consumption improvement of a transmission having a speed change ratio electrically altered and high transmission efficiency of a gear type transmission for mechanically transmitting power. During speed change of an automatic speed change section (20), learning method of engaging pressure is altered by an engaging control amount control means (84) according to the fact whether a differential section (11) is in variable speed change state or not, and the rotational speed N18 of a transmission member is varied to satisfy both enhancement of feeling and suppression of speed change shock depending on the stepless speed change state and non-stepless speed change state having different inertia at the time of speed change, thus suppressing occurrence of speed change shock.

In a vehicle drive device comprising a differential mechanism and a motor provided therein, size of the drive device is reduced or its fuel consumption is improved while suppressing occurrence of speed change shock. Since an exchange clutch C0 or an exchange brake B0 is provided, a speed change mechanism (10) is switched between a stepless speed state and a stepped speed state so as to obtain a drive device having both advantages of fuel consumption improvement of a transmission having a speed change ratio electrically altered and high transmission efficiency of a gear type transmission for mechanically transmitting power. During speed change of an automatic speed change section (20) when a differential section (11) is in variable speed state, engaging pressure of an engaging device in the automatic speed change section (20) is controlled by an engaging pressure control means (84) so that the rotational speed N18 of a transmission member is varied to satisfy both quick speed change response on feeling and slow speed change response on speed change shock, thus suppressing occurrence of speed change shock.

The invention relates to a commutation opportunity determination method and a commutation system for three-phase unbalanced commutation. The method comprises the steps of converting a multi-objectiveoptimization problem into a single-objective optimization model through a constraint method, solving an optimal solution set of the single-objective optimization model in combination with a genetic algorithm and a simulated annealing algorithm, determining an optimal solution in the optimal solution set, determining the optimal solution as a commutation opportunity, and determining a to-be-switched load and a switching sequence thereof based on the commutation opportunity so as to carry out switching. According to the method, multiple targets are converted into one target, the calculation efficiency is improved, the number of generated current optimal solutions is controlled by adjusting breakpoints of constraint conditions, and high objectivity is achieved. Secondly, through combination of a genetic algorithm and a simulated annealing algorithm, a global optimal solution can be rapidly and accurately obtained, safety risks caused by three-phase imbalance are effectively avoided, and the level of power grid operation planning is improved. In addition, three-phase imbalance states of transformers of different types and different capacities can be analyzed, and the application rangeis wide.

The invention relates to a layered high-density demersal breeding fish pond. The layered high-density demersal breeding fish pond is that at least one inhabiting layer structure is arranged in the center of the bottom surface of the fish pond; the inhabiting layer structures are overlapped, each comprising an inclination support for supporting a horizontal circular porous separating plate; the aperture of the porous separating plate is more than the maximum diameter of particle feed; the porous separating plate is provided with at least one fish passing hole through which fish can cross the upper layer and the lower layer to move; a water feeding pipe is vertically arranged in the center of the fish pond and horizontally communicated with horizontal water distributing pipes; each inhabiting structure is corresponding to at least four water distributing pipes; the bottom structure of the fish pond is high in middle, low in four sides, and about 3 to 5 degrees in gradient; a circle of downwards-concave sewage collecting tanks is formed in the bottom part of the wall of the fish pond; a plurality of sewage draining pipes are arranged below the sewage collecting tanks; a water returning pipe is arranged on the sidewall of the fish pond; a circulating water pump is arranged between the water returning pipe and the water feeding pipe to provide water circulating power. According to the layered high-density demersal breeding fish pond, water is treated by physical filtering, biological filtering, oxygen increase, sterilizing and other purifying links and then is recycled, so that breeding with circulating water can be achieved.

The invention provides a junction barrier Schottky diode with a floating field ring terminal structure and a preparation method thereof, and belongs to the technical field of semiconductors. The diodecomprises a ohmic contact metal cathode, a substrate, a first epitaxial layer, a second epitaxial layer, a comb-shaped p region, a Schottky contact metal anode and an insulating layer from the bottomup, wherein the comb-shaped p region includes a plurality of PN junction p regions arranged at intervals and a plurality of floating field rings arranged at intervals on two sides of the outer side PN junction p regions. The invention further provides a preparation method of the junction barrier Schottky diode with the floating field ring terminal structure. The diode adjusts the electric field distribution through the comb-shaped PN junction structure, avoids the concentration of the electric field, disperses the electric field concentrated at the edge of the P-type region among a pluralityof field rings and reduces the maximum value of the electric field. In addition, the appropriate field ring width and gap are selected, and the electric field concentrated at the outmost field ring can be dispersed among the field rings, thereby avoiding the device breakdown caused by the excessively high local electric field.

The invention discloses a non-isolated staggered parallel control method and a control device. The non-isolated staggered parallel control method comprise steps that: when an inductor of a three-phase full bridge staggered parallel circuit operates in a current continuous mode, three phases of voltages Va, Vb and Vc at the alternating current side and corresponding sectors are acquired; a switch state of each switch tube is determined according to the three phases of voltages Va, Vb and Vc at the alternating current side and the corresponding sectors; pulse-width modulated waves are sent to the switch tubes according to the three phases of voltages Va, Vb and Vc at the alternating current side and the corresponding sectors. According to the method and the device, not only can the maximum value of the common-mode circulation peak value be reduced, the dimension of the common-mode inductor is reduced, but also the differential-mode current is further reduced, the dimension of an EMC filter and the ripple current of a direct current side capacitor are reduced, moreover, the power fluctuation caused by discontinuous output current during sector switching in a control progress can be reduced.