64results about How to "Increase power ratio" patented technology

A system and method for managing electrical power generated by an engine for use in connection with operating a hybrid energy off highway vehicle load control system. A load control circuit determines a current operating condition of the Off Highway Vehicle, and determines a corresponding target operating condition of the Off Highway Vehicle The load control system determines a difference between the current operating condition and a target operating condition to identify transients. The load control system delivers power from the power source to a energy storage for an initial period after a transient condition is identified and then delivers power from the power source to source to the traction motors to propel the Off Highway Vehicle. The load control system also retrieves to power from the energy storage to assist in propelling the Off Highway Vehicle.

A brushless electrical machine, usable as a motor, generator, or alternator, has a rotor that is comprised of a rim portion and a substantially open center portion. The rim portion has a partially hollow core in which a stationary field coil is supported. Current to the field coil generates magnetic flux that circulates in a poloidal flux path in the rim, crossing a single magnetic air gap formed by the rim. Protrusions in the rim located around the circumference form poles all having the same polarity. As the rotor rotates, the flux exiting the poles passes through multiple stationary armature windings around the circumference that are located in the single air gap. An AC voltage is induced in the armature windings from rotation.

The display device includes: an array substrate having an in-cell polarizing layer and a color layer; a counter substrate; a liquid crystal layer; a white light source; and a polarizing plate placed on the counter substrate on its one side opposite to a side on which the liquid crystal layer is provided. The color layer includes a red color layer, a green color layer and a blue color layer. The red color layer includes a red color filter and a red wavelength conversion layer which is located on its one side closer to the white light source than the red color filter. The green color layer includes a green color filter and a green wavelength conversion layer which is located on its one side closer to the white light source than the green color filter. The blue color layer includes a blue color filter.

Wired/wireless optical signal modulation and demodulation apparatuses and methods using an intensity modulation/direct detection method and an orthogonal frequency division multiplexing (OFDM) method are provided. A unipolar OFDM symbol frame is generated by determining the polarity of each of a plurality of sub-frames of a bipolar OFDM symbol frame which comprises both a plurality of positive pulses and a plurality of negative pulses, inverting the polarity of the sub-frames which are determined to be negative, delaying one of the positive sub-frame and a positive sub-frame obtained through the inversion by the duration of the sub-frames, and multiplexing the result of the delaying and whichever of the positive sub-frame and the positive sub-frame obtained through the inversion is not the result of the delaying. The unipolar OFDM symbol frame can guarantee high power amplification efficiency and high transmission power efficiency, and is robust against a multi-path channel environment. Therefore, the unipolar OFDM symbol frame can be used in various optical signal modulation/demodulation methods for wireless indoor broadband optical transmission devices, wired broadband optical transmission devices using multi-mode optical fibers, and radio-over-fiber devices which transmit baseband analog signals as optical signals.

An encoding device in a data transmission/reception system includes a first convolutional encoder that encodes an outer code, an interleaver that permutes input data, a second convolutional encoder that encodes an inner code, and a muti-level modulation mapping circuit that performs signal-point mapping based on eight-phase shift keying. When the encoding device uses the second convolutional encoder having two or more memories, the first convolutional encoder uses, as the outer code, a code with a minimum output distance greater than the maximum input distance at which the minimum-distance inner code is generated.

The present invention discloses an improved initialization method for modem communication wherein the timing offset required for synchronization is estimated utilizing an entire received DMT frame and the channel impulse response is estimated utilizing the pilot tones received within the same DMT frames utilized for synchronization.

System and method embodiments are provided herein for achieving low peak-to-average power ratio (PAPR) signals in multiple-input and multiple-output (MIMO) systems, including Massive MIMO (M-MIMO) systems. The embodiments include two schemes to reduce the PAPR in the transmitted signals. In a first scheme, the signals are precoded, at a BS or UE, to offload a signal from one antenna to another antenna to achieve PAPR reduction. The precoding is done with some penalty in terms of signal gain. In a second scheme, the signal is clipped and the clipped portion is further projected on the MIMO antennas to compensate for the error caused by clipping. Out-of-band radiation is also removed in this scheme.

A method of multipath compensation for digital pre-distortion (DPD) linearization suppresses linear distortion caused by reflected signals and distortion in transmitting and receiving paths. Reflection suppression suppresses effects of the linear distortion on the transmitting and receiving paths.

The invention discloses a Gysel non-uniform power distributor with a high power distribution ratio. The Gysel non-uniform power distributor with the high power distribution ratio comprises an upper-layer micro-strip structure, an isolation element, an interlayer medium substrate and a lower layer earthing metal plate. Each Gysel non-uniform power distributor with a high power distribution ratio comprises two impedance transformers with a 90-degree phase difference, four 1/4-wavelength branch lines with different characteristic impedances and two isolation resistors, wherein the input/output impedance of each impedance transformer can be regulated by changing the strength of coupling of a resonator so as to carry out power distribution of different ratios and realize matching. Compared with a Gysel power distributor of which the input port and the output port are connected by a 1/4-wavelength impedance line, the structure is characterized in that the high power distribution ratio can be realized, and the bandwidth of the structure can be arbitrarily controlled. Meanwhile, two transmission zero points can be established on the edge of a passband, and the frequency selectivity is improved. The Gysel power distribution filter with the high power distribution ratio has the high power distribution ratio of 10:1, and can be suitable for various antenna array fields.

The invention relates to a preparation method of gallium arsenide thin-film multijunction stacked solar cells. The preparation method is characterized by including the steps of firstly, allowing for reverse growth of an epitaxial layer to prepare a GaAs three-junction solar cell; secondly, bonding the cell prepared in the step 1 to a Si substrate; thirdly, stripping a Ge substrate; fourthly, adhering a low-cost substrate; and fifthly, stripping the Si substrate. The preparation method allows for epitaxial growth of a top cell and an intermediate cell prior to growth of a bottom cell, and accordingly the lattice subjected to epitaxial growth firstly is guaranteed to match with perfect epitaxial growth of the top cell and the intermediate cell; doping uniformity and film reliability in large-area epitaxial thin films are increased, and photoelectric conversion efficiency is further improved; by the use of the low-cost support substrate lower than Ge in specific weight, the weight of the cells is reduced, the power ratio of the solar cells is increased, the cost of the cells is reduced effectively, and application prospect of the III-V compound solar cells is improved greatly.

The invention discloses a soft driver for assisting extension and abduction of the thumb of a human hand and a pair of gloves. The soft driver comprises an inner-layer silicone tube, an outer-layer silicone tube, Kevlar fiber wires and two sections of fiberglass cloth, wherein the front end of the inner-layer silicone tube is sealed, and an opening is formed in the rear end and is used for connecting a pneumatic or hydraulic driving device; one Kevlar fiber wire is wound on the part, which corresponds to a metacarpal bone of the thumb, of the outer wall of the inner-layer silicone tube in a single-screw way, and the other Kevlar fiber wire is wound on the part, which corresponds to a phalanx of the thumb, of the outer wall of the inner-layer silicone tube in a double-screw way; the two sections of fiberglass cloth are both adhered to the side, which departs from fingers, of the inner-layer silicone tube, and positions of the two sections of fiberglass cloth respectively correspond to aconnecting joint of the metacarpal bone and a proximal phalanx of the thumb and a connecting joint of the proximal phalanx and a distal phalanx; the Kevlar fiber wires and the fiberglass cloth are fixed to the outer wall of the inner-layer silicone tube by the outer-layer silicone tube. By carrying the soft driver on the gloves, extension and abduction rehabilitation training of the thumb can beassisted.

Power amplifiers for amplifying a radio frequency signal are provided. The power amplifier may include an envelope tracking power supply, a carrier amplifier coupled with the envelope tracking power supply and configured to amplify the radio frequency signal, an input matching network configured to split the amplified radio frequency signal from the carrier amplifier such that one part of the amplified radio frequency signal passes along a peak amplifier path and another part of the amplified radio frequency signal passes along an impedance transformer path, a peak amplifier coupled with the envelope tracking power supply and configured to amplify the one part of the amplified radio frequency signal from the input matching network, an impedance transformer configured to perform impedance transformation on the other part of the amplified radio frequency signal from the input matching network, an output matching network configured to combine the output of the peak amplifier and the impedance transformer, wherein the peak amplifier is configured to be switched off in a lower power mode and switched on in a high power mode based at least in part on an input power level of the radio frequency signal. With the claimed solutions, more powerful and efficient power amplifiers that are capable of operating over broader frequency ranges may be achieved.

A FOW-based 2-by-2 space-time MIMO wireless system based on Alamouti's Space-Time block code with a feedback optimum weight (FOW) technique is provided, including a MIMO transmitter, a 2-by-2 MIMO channel, two FOW-based MIMO receivers, an optimum weight vector module, a Bayes decision algorithm module, a coherent combining unit, and a maximum likelihood detector (MLD). The FOW-based 2-by-2 space-time MIMO wireless system of the present invention uses the Bayes decision algorithm to determine the optimum weights at the receiver which multiplies the transmitted output signals at spatial antennas via up-link Fast Channel Feedback (i.e. closed-loop MIMO) and also the corresponding receiving signals. In addition, the present invention includes a Scheduler design to arrange these weight elements in accordance with space-time constellation signals, which allows linear processing using Alamouti's 2-branch maximum likelihood detection without increasing the hardware complexity.

A microfabricated valve with no moving parts. In one embodiment, the valve includes a reservoir of a liquid that is in fluid communication with an outlet channel having a throat that is less than 100 microns wide. Preferably, the channel is an elongated slit. The configuration of channel is adapted and configured such that surface tension of the liquid prevents flow out of the channel. A heater increases the temperature of the meniscus of the fluid, until a portion of the fluid is ejected from the channel. The ejection of the fluid creates both a thrusting effect and a cooling effect.

The invention discloses a software driver for assisting four-finger stretching of a human hand. The software driver includes an inner layer silicone tube, an outer layer silicone tube, a Kevlar fiberline and three-section glass fiber cloths. The front end of the inner layer silicone tube is closed, the rear end of the inner layer silicone tube is provided with an opening which is used for being connected with an air pressure or hydraulic driving device, the Kevlar fiber line is wound around a portion of the outer wall of the inner layer silicone tube corresponding to four-finger phalanges ina double helix mode, the three-section glass fiber cloths are attached to the side of the inner layer silicone tube deviated from the fingers, the positions respectively correspond to a connecting joint for the four-finger phalanges and proximal phalanges, a connecting joint for the proximal phalanges and intermediate phalanges and a connecting joint for the intermediate phalanges and distal phalanges; the outer layer silicone tube sleeves the inner layer silicone tube and is closely combined with the inner layer silicone tube, and the Kevlar fiber line and the glass fiber cloths are fixed onthe outer wall of the inner layer silicone tube. By loading the drive, a glove achieves simulation of four-finger stretching exercise and assists the four fingers in stretching training.

A fuel cell system includes an auxiliary machine electrically connected to a fuel cell, the auxiliary machine being driven by power of the fuel cell, a heater electrically connected to the fuel cell, the heater being configured to heat cooling water supplied to the fuel cell, and a warm-up control unit configured to warm up the fuel cell itself by the supply of power to the auxiliary machine and the heater during start-up of the fuel cell below freezing point. The warm-up control unit includes a water amount computation unit configured to compute a produced water amount on the basis of a degree of wetness and a temperature of the fuel cell and a generated power of the fuel cell during warm-up, the produced water amount being a water amount produced in an electrolyte membrane until the temperature of the fuel cell increases to a freezing point temperature, and an anti-freezing control unit configured to increase a power ratio of power to the heater in regards to the auxiliary machine during the warm-up when the computed produced water amount is determined to be larger than a threshold value.

The present disclosure discloses a backlight control circuit for adjusting a current of an LED module of an electronic device including a driving chip having a feedback terminal and a reference voltage terminal, a feedback voltage regulating unit, and a power supply regulating unit; the feedback voltage regulating unit is also connected to the 2D/3D signal terminal, the feedback terminal voltage is controlled so that the feedback terminal voltage of the feedback terminal of the driving chip is lower than the reference voltage of the reference voltage terminal when receiving the three-dimensional signal generated at the 2D/3D signal terminal. The present application also provides an electronic device. With the scheme of the present application, the current of the LED module can be increased when the electronic device is in the three-dimensional mode.

A transmitter includes a first digital up-converter for converting data to an intermediate frequency (IF) signal, a pulse width modulator (PWM) for encoding the IF signal to an IF pulse train, a second digital up-converter for converting the IF pulse train to a radio frequency (RF) pulse train, a power amplifier for amplifying the RF pulse train; and a filter for reconstructing a RF analog signal from the amplified RF pulse train.

A transmitter includes: multiple digital transmitters which perform delta-sigma modulation on the same baseband signal; a combiner that combines the output signals from the plural digital transmitters and outputs the combined result; a control unit that generates an external signal different for every digital transmitter, to be supplied to each of the digital transmitters; and, an input means that supplies the different external signal for every digital transmitter, to the input terminal or the internal node of a delta-sigma modulator that performs the delta-sigma modulation, the delta-sigma modulator being provided for every digital transmitter.

The invention discloses a hydraulic driving device for a large reel type sprinkler. The driving mechanism comprises a hydraulic motor and a hydraulic system, wherein the hydraulic motor is arranged ona reel support frame; an output shaft of the hydraulic motor is connected to a reel shaft through a coupling; the hydraulic system comprises a hydraulic pump, a hydraulic valve block and a hydraulicpump driving device; the hydraulic valve block is fixed to a vehicle body; a three-position four-way directional control valve, a proportional throttle valve, a one-way valve and a two-position two-way directional control valve are arranged on the hydraulic valve block; the hydraulic pump enables hydraulic oil in an oil tank to sequentially pass oil inlets of the proportional throttle valve and the three-position four-way directional control valve and enter the hydraulic motor; return oil of the hydraulic motor sequentially passes an oil return hole of the three-position four-way directional control valve and the one-way valve and returns to the oil tank; the two-position two-way directional control valve is connected in parallel to an oil line between an oil outlet of the proportional throttle valve and the oil inlet of the three-position four-way directional control valve; and an oil outlet of the two-position two-way directional control valve communicates with the oil tank. The hydraulic driving device can supply relatively large reel driving force, can also accurately detect the recovery speed of PE pipes and meanwhile is simple in structure and low in failure rate.

A pump for conveying a fluid includes a stationary housing, an impeller conveying the fluid from a low pressure region to a high pressure region, a shaft to rotate the impeller about an axial direction, and a separation device to restrict a flow of the fluid from the high pressure region to the low pressure region. The separation device includes a rotary part connected to the shaft, and a stationary part stationary with respect to the housing. The rotary and stationary parts face each other and delimit a gap between the stationary part and the rotary part. The gap is arranged between the high and low pressure regions. A recess is disposed in the stationary part or the rotary part, the recess including a bottom, and a non-metallic insert is disposed in the recess. A relief channel enables fluid communication between the bottom and the low pressure region.

A system, wireless device (102) and method reduce the peak-to-average power of a transmitter by creating at least two sampled carrier data streams, running each carrier through a separate delay block, mixing each carrier over in frequency an appropriate amount, resulting in at least two frequency division multiplexed signals, and combining the at least two frequency division multiplexed signals together. The four sampled carrier data streams may each have a bandwidth of 25 kHz. Each separate delay block is less than 20% of its corresponding symbol time. The transmitter may be used to transmit wideband integrated digitally enhanced network (WiDEN) signals.