405results about How to "Reduce input power" patented technology

Provided is a semiconductor opto-electronic device that may comprise an active layer including a quantum well and a barrier layer on a substrate, upper and lower waveguide layers on and underneath the active layer, respectively, and upper and lower clad layers on and underneath the upper and lower waveguide layers, respectively. The semiconductor opto-electronic device may further comprise an upper optical confinement layer (OCL) between the active layer and the upper waveguide layer and having an energy gap smaller than the energy gap of the upper waveguide layer and equal to or larger than the energy gap of the barrier layer, and a lower OCL between the active layer and the lower waveguide layer and having an energy gap smaller than the energy gap of the lower waveguide layer and equal to or smaller than the energy gap of the barrier layer. Also provided is a method of fabricating the semiconductor opto-electronic device.

A highly efficient semiconductor optoelectronic device is provided. The semiconductor optoelectronic device includes an active layer, an upper waveguide layer provided on the active layer and a lower waveguide layer provided under the active layer, an upper cladding layer provided on the upper waveguide layer and a lower cladding layer provided under the lower waveguide layer, a substrate supporting a deposited structure of the lower cladding layer, the lower waveguide layer, the active layer, the upper waveguide layer, and the upper cladding layer, and upper and lower optical confinement layers provided between the active layer and the upper waveguide layer and between the active layer and the lower waveguide layer, respectively, and having an energy gap that is smaller than those of the upper and lower waveguide layers but greater than that of the active layer.

The invention relates to a multi-carrier transmission method and a multi-carrier transmission device based on selected carrier modulation. The multi-carrier transmission method comprises the steps that a transmitting end groups sub-carriers in an orthogonal frequency division multiplexing (OFDM) system and correspondingly groups bit data to be transmitted, after grouping, one part of bit data in each group of data selects n-k sub-carriers from n sub-carriers of each group as virtual carriers, the other part of bit data is modulated into k symbols which are mapped to the remaining k sub-carriers, and virtual carriers and the carriers which carry the data form OFDM symbols and then are transmitted; and a receiving end groups balanced receiving frequency domain symbols in a way as the same as the grouping way of the transmitting end, virtual carrier position identification is conducted in each group of symbols, virtual carrier positions are mapped to be bits to obtain the first part of data , virtual carrier position symbols in each group are removed and the remaining k symbols are demodulated to obtain the second part of data. The multi-carrier transmission method and the multi-carrier transmission device based on the selected carrier modulation solve the problem that the energy consumption of the traditional OFDM system is high in order to obtain more information under the situation that the bandwidth and the noise power of the system are determined.

Provided are a semiconductor device having a superlattice semiconductor layer and a method of fabricating the same. The semiconductor device includes a superlattice semiconductor layer in which first material layers and second material layers formed of different materials are alternately stacked. A plurality holes are formed in the first material layers and the second material layers forming a superlattice structure, and the holes are filled with materials of the adjacent material layers. The provided superlattice structure reduces a driving voltage by transferring charges through the holes in the first material layers and the second material layers while maintaining a predetermined optical confinement characteristic.

The invention discloses a resonance enhanced wireless power transmission structure with high resonance frequency stability, and relates to the technical field of wireless power transmission. According to the wireless power transmission structure provided by the invention, the change of a coupling coefficient and a load cannot influence the resonance frequency, the primary side works at a constant frequency, the voltage and the current are same in phase, and the design of an absorption circuit and a soft switch is easily realized; due to a secondary-side impedance adjusting circuit, on one hand, the whole back-stage omega 0 frequency component of a rectifier bridge is purely resistive and the load change is guaranteed not to influence the resonance frequency, and on the other hand, the output voltage is stable and the power supply demand of the back-stage load is met; meanwhile, compared with an existing secondary-side wireless power transmission structure, the secondary-side structure proposed by the invention has relatively high resonance value Q, so that the resonance is enhanced, the transmission power under the weak coupling condition is increased, and the transmission efficiency under the weak coupling condition is improved. The resonance enhanced wireless power transmission structure is suitable for wireless power transmission occasions.

The permanent magnetic punch includes a yoke iron, a punching head reciprocating up and down inside the yoke iron, and an armature connected to the punching head. The present invention features that the permanent magnetic punch includes also a magnetic driving mechanism to make the yoke iron and the armature to constitute one magnetic loop, and the magnetic driving mechanism is provided with electromagnetic mechanism to apply electromagnetic drive force to the armature and permanent magnet to apply permanent magnetic attraction force to the armature. The present invention is superior to available electromagnetic punch, which has great power consumption and complicated control system.

In a revolution type compressor using a balance weight for balancing a rotating mass, the effect of oil churn reduction is enhanced, and compressor input is reduced. A balance weight fixed to a drive shaft between a rotor of an electric motor 4 and a compression mechanism includes a weight portion in a substantially semicircular column shape for balancing a rotating mass, a cover portion which is substantially semi-cylindrical and has an opening in the vicinity of a top and bottom at an opposite side in a radial direction from the weight portion, and a hollow space surrounded by the weight portion and the cover portion. Further, a space for discharging oil is provided between the balance weight and the rotor. By the structure, reduction in oil churn, and reduction in input of the compressor are realized, and the compressor with less power consumption is obtained.

The invention relates to a compact of a liquid reservoir and an oil separator of a compressor, comprising a casing, a high and low pressure partition plate, an air suction inlet pipe, an air suction outlet pipe, an exhaust inlet pipe, an exhaust outlet pipe and a capillary pipe. The compact structure is characterized in that the high and low pressure partition plate divides the cavity in the casing into a liquid storing cavity and an oil separating cavity; fluid in the liquid storing cavity can exchange heat with fluid in the oil separating cavity through the high and low pressure partition plate; the air suction inlet pipe and the air suction outlet pipe extend in and are communicated with the liquid storing cavity; the exhaust inlet pipe and the exhaust outlet pipe extend in and are communicated with the oil separating cavity; and the high and low pressure partition plate is provided with an oil return hole which is communicated with an oil return hole on the air suction outlet pipethrough the capillary pipe, so that the lower part of the oil separating cavity is communicated with the air suction outlet pipe, and the air suction outlet pipe is communicated with the lower part of the liquid storing cavity through the oil return hole on the air suction outlet pipe.

The invention relates to a combined near field communication and wireless power transmitter device comprising a first antenna coupled to antenna tuning network and capable of coupling to one or more second antennae in the near field of the first antenna with coupling characteristics, means for communicating wirelessly using said first antenna with a near field communication device in a near field communication mode, and means for transmitting wirelessly power using said first antenna to another device in the vicinity of the first antenna in a power transmission mode. In power transmission mode, the antenna tuning network operates in resonance and has an initial input impedance which is configured to change if there is a change in the coupling characteristics during power transmission, for example charging. The invention also relates to a method of transmitting power to a mobile device for example for charging purposes.

The invention discloses a planetary speed reduction type eccentricity-adjustable helical hole-milling device. The planetary speed reduction type eccentricity-adjustable helical hole-milling device is characterized by comprising a rotation system, a revolution system, a radial eccentricity adjusting system, a clamping braking system assembly and an axial feeding system. The radial eccentricity adjusting system can achieve precise trace linear eccentricity adjustment with high transmission ratio, and required input power is small. Compared with sliding block adjusting structures disclosed by existing patents, the radial eccentricity adjusting system can perform adjustment conveniently with less labor, and compared with a dual eccentric sleeve structure and an offset sliding block structure, the ratio of the size of the adjusting structure to the size of a rotation power source is greatly decreased, the occupied space is reduced, and the dead weight is reduced relatively in case of the identical material. Compared with an electromagnetic brake, the clamping braking system assembly can perform braking easily and conveniently; compared with a radial screw holding structure, the required pretightening force is small, and clamping is reliable; and compared with a worm and gear structure, self-locking never fails, and the working stability is high.

The invention discloses a movable windbreak for a bridge, and relates to a bridge technology. The movable windbreak comprises a plurality of movable windbreak units which are sequentially and linearly arranged along the bridge towards both sides of the bridge floor, wherein each movable windbreak unit comprises a movable windbreak face, a special driving mechanism, a bracket and a base. The movable windbreak for the bridge can effectively ensure the driving safety on the bridge under crosswind conditions, raise the ambient wind speed for driving on the bridge, effectively ensure the wind resistance safety of a major bridge structure after the windbreak is arranged, and effectively lower the cost of the major bridge structure in the aspect of wind resistance design.

When a battery of an electric vehicle charged with an external power source (AC 100 V), the electric vehicle and the external power source are connected with each other by the intermediary of a charging cable. Upon this charging, it is determined whether or not an input voltage from the external power source is 95 V or more. When the input voltage is less than 95 V, that is, a decline of the voltage in the charging cable is large, since a wiring resistance in the charging cable possibly increases, an upper limit of an output power to the battery is reduced. Consequently, the electric power delivered from the external power source can be limited, and thereby excessive heat generation is inhibited and safety is ensured. Furthermore, since the output power is caused to be limited when the wiring resistance possibly increases, the battery can be charged continuously.

The invention provides a millimeter wave high-power low-noise reception front-end, and aims to provide a reception front-end to solve difficulties of high-power burnout resistance and large dynamic range of a millimeter wave low-noise receiver. The millimeter wave high-power low-noise reception front-end is realized according to the following technical scheme: when high-power radio frequency input signals enter the reception front-end, firstly N-channel power division is performed through a microstrip power-dividing network to form N channels of radiofrequency signals, the power of each channel of signals is reduced to 1/N of that of the radio frequency input signals, amplitude limiting of each channel of radiofrequency signals is performed through an amplitude limiter, the power of each channel of signals is limited in the milliwatt magnitude, then the signals are amplified through a low-noise amplifier connected with the amplitude limiter in series and sent to a power synthesis network, power synthesis of the N channels of signals is performed, and a channel of radiofrequency signals are output through synthesis. According to the millimeter wave high-power low-noise reception front-end, the input power of each amplitude limiter is greatly reduced, the power burnout resistant indexes of the reception front-end are greatly increased, 1dB compression points of the synthesis signals are greatly increased compared with single-channel signals, and the dynamic range of the reception front-end is extended.

The invention discloses a swing type room temperature magnetic refrigeration machine, which comprises a permanent magnet magnetic field source system, a magnetic working medium turntable system, a fluid heat exchange system and a motion control system, wherein the motion control system controls a turntable box of the magnetic working medium turntable system to rotate so as to drive a magnetic working medium to get in or get out a magnetic field space; the magnetic working medium positioned in the magnetic field space is magnetized to release heat; heat transmission fluid flows towards a hot-end heat exchanger so as to transmit the heat produced by the magnetic working medium to the hot-end heat exchanger; the hot-end heat exchanger transmits the heat to a high temperature space; the magnetic working medium which is not positioned in the magnetic field space is demagnetized to absorb heat; the heat transmission fluid flows towards a cold-end heat exchanger; and the magnetic working medium absorbs the heat from a low temperature closed space through the fluid and the cold-end heat exchanger, so that a refrigeration effect at room temperature can be achieved and the structure of the magnetic refrigeration machine is simplified. The swing type room temperature magnetic refrigeration machine has the advantage of simple structure of a reciprocating room temperature magnetic refrigeration machine and the advantage of high efficiency of a rotary room temperature magnetic refrigeration machine.