35results about How to "Reduce peak power requirements" patented technology

Systems and method of detection and discrimination of targets in the presence of interference are disclosed. A system transmits a signal and then receives signals including interference and reflections of transmitted signals. The system processes the received signals and transmitted signals to generate a 2D representation of the STAP cube with one of the dimensions collapsed. The system then reduces the interference contributions and identifies angle and Doppler component of potential targets. The system then computes slices, which are one dimensional representation of cross-ambiguity functions of the received and transmitted signals. It reduces the interference contributions in the slices and determines range components of the targets.

An apparatus and method thereof for processing base band signals to reduce peak power requirements for a multi-channel transmitter is disclosed. The apparatus includes a first Fourier Transform Matrix (FTM) coupled to one or more input signals for providing a plurality of output signals; a processing unit for limiting a peak value for each of the output signals, and a second FTM for decomposing the peak limited output signals to provide one or more output base band signals, each of the output base band signals corresponding to one of the input signals. A multi-channel transmitter further converts the output base band signals to a radio frequency signals; a first analog FTM provides a plurality of amplifier input signals; a power amplifier having a plurality of amplifiers provides a plurality of amplified output signals; and a second analog FTM coupled to the amplified output signals provides transmit signals corresponding one to one with the output base band signals.

A peak to average reduction apparatus and method thereof for reducing peak power requirements of a multi-channel transmitter is discussed. The apparatus includes: a Fourier Transform Matrix (FTM) coupled to one or more input signals for providing a plurality of output signals each comprising a combination of phase shifted versions of the one or more input signals; and a processing unit coupled to the output signals for limiting a peak value for each of the output signals to provide a plurality of peak limited output signals, wherein the peak limited output signals are suitable for generating a plurality of signals for driving the multi-channel transmitter. A transmitter further includes a power amplifier having a plurality of amplifiers coupled to these signals, each amplifier coupled to a one of the signals that correspond to one of the peak limited output signals to provide an amplified output signal, wherein the plurality of amplifiers provide a plurality of amplified output signals; and a radio frequency FTM coupled to the amplified output signals to provide one or more transmit signals corresponding one to one with the input signals.

The invention discloses a biological radar human body target identification method based on a zero crossing point technology. The method comprises following four steps of a zero crossing point extracting step, a time domain accumulating step, a signal to noise ratio estimating step and a threshold value judging step. The condition that human body breathing zero crossing point characteristic quantification is detected by a UWB (ultra-wide bandwidth) biological radar is realized in the zero crossing point extraction step; zero crossing point extraction results are accumulated at time in time domain accumulation step, so that misjudgment caused by accident factors is lowered; the signal to noise ratio estimation is used for quantitative indexes of human body target identification; and set threshold values of the quantitative indexes are judged, and automatic identification on a human body target is finally realized in the threshold value judging step.

The invention discloses a miniature hydraulic drive system used for an ankle joint artificial limb. The miniature hydraulic drive system comprises an electromotor, a hydraulic pump, a first check valve, a second check valve, a first energy accumulator, a second energy accumulator, a first normally-opened switching valve, a second normally-opened switching valve, a first normally-closed switching valve, a second normally-closed switching valve and a double-ejection-rod hydraulic cylinder. In the miniature hydraulic drive system, by means of unceasing work of the motor and energy storage of the energy accumulators, the requirement for the peak power of the motor can be reduced; and the power consumption is lowered during long-term walking so that the cruising ability can be improved. In the miniature hydraulic drive system, the direct-current motor and the hydraulic pump unceasingly work in the whole movement process, the energy utilization efficiency of the system is improved, frequent start, stop and reversing of the motor are avoided, and therefore the usability of the motor is improved, and the service life of the motor is prolonged.

The invention belongs to the technical field of power supplies, and in particular relates to a capacitor charging method and apparatus with constant power input and constant current output characteristics. A continuous working mode characteristic is mainly adopted, and returned redundant energy is stored in a temporary energy storage link, so as to charge a load and charge the energy storage link at the same time; in addition, a mode of switching an excitation source in the front half cycle of resonance current is adopted to establish an access for outputting energy to a resonance loop in the energy storage link so as to realize that the temporary energy storage link can perform an auxiliary power supplying function together with a power grid in the charging period for the load; and through real-time regulation and control on the switching time, the constant of the power supply power is realized. The temporary energy storage link is a voltage source, and a DC-link direct current busbar is a voltage source also; for avoiding short circuit between the two voltage sources of different voltages, the two voltage sources are serially connected with bidirectional switches respectively and then the voltage sources are connected with the resonant loop so as to realize the reliable switch of the resonant current between the voltage sources.

The invention discloses an electro-hydraulic hybrid drive vehicle power system comprising an electronic control unit, motors, a battery pack, a first hydraulic energy accumulator, a variable hydraulicmotor, a clutch, a plurality of sets of wheels and a drive axle. The battery pack is connected with the two motors, the output ends of the two motors are connected with two wheel in one set respectively, the first hydraulic energy accumulator is connected with an oil transportation inlet of the variable hydraulic motor, and the first hydraulic energy accumulator is used for storing recycled braking energy and auxiliary driving and braking; the variable hydraulic motor is connected with the drive axle through the clutch to drive the two wheels in another set, the electronic control unit is respectively connected with the motor, the first hydraulic energy accumulator, the variable hydraulic motor and the clutch, the electronic control unit controls the running working condition of the motorand the displacement of the variable hydraulic motor, the on-off of the first hydraulic energy accumulator and the engagement or separation of the clutch, and the battery pack supplies power to the motor and the electronic control unit. The electro-hydraulic hybrid drive vehicle power system has the advantages of infinitely variable speed and four-wheel driving, energy saving and enhancement of endurance.

The invention discloses a drive-driven-combined prosthesis knee and ankle joint hydraulic loop with an energy recycling function and aims to solve the problems that a drive hydraulic prosthesis systemis high in energy consumption, short in endurance time and the like. The hydraulic loop comprises a motor, a coupler, a hydraulic pump, a first energy storage device, a second energy storage device,an adjustable throttling valve, a knee joint hydraulic cylinder, an ankle joint hydraulic cylinder, a first three-position four-way proportional valve, a second three-position four-way proportional valve, a third three-position four-way proportional valve, a first pressure sensor, a second pressure sensor, a third pressure sensor, a fourth pressure sensor, a fifth pressure sensor, a sixth pressuresensor, a first pipeline and a second pipeline . The hydraulic loop has the advantages that the energy storage devices are controlled through the three-position four-way proportional valves to absorband release energy generated during human body walking, system energy consumption can be effectively lowered by further using the drive-driven-combined drive mode, the performance of lower-limb prosthesis is increased evidently, and structure simpleness and lightweight are achieved conveniently at the same time.

The invention discloses a peak shifting controlling method for multi-channel current. The method comprises the steps of respectively determining the maximum value of the three-phase current of each motor in a plurality of motors at the same time; respectively judging whether all maximum values are greater than rated current, and carrying out the following operations according to judgment results; if the maximum values are not greater than the rated current, calculating the corresponding duty ratios of the corresponding motors according to a standard space vector algorithm, so as to control the three-phase current of the motors; if the maximum values are greater than the rated current, judging whether the maximum values are greater than the rated current, judging whether the maximum values are maximum values of all motors of which numerical values are maximum, and carrying out the further operation according to the judgment results. According to the peak shifting controlling method and a peak shifting controlling device for multi-channel current provided by the invention, the demand on the peak value power of a servo power supply can be reduced greatly, and the integration and miniaturization degrees of a servo system are higher, therefore the peak shifting controlling method and the peak shifting controlling device are used for the output control of a multi-channel control driver of an electromechanical servo system.

The invention discloses an excavator movable arm series connection type hybrid power system based on double fly wheels. A prime motor is connected with a first hydraulic pump. A port P of the first hydraulic pump is connected with a port P of a first hydraulic motor through a first one-way valve. The first hydraulic pump is connected with a second hydraulic pump sequentially through a one-way clutch, a first speed changer, a first clutch, the first fly wheel, a second clutch and a second speed changer. A port S and a port P of the second hydraulic pump are connected with an oil tank and a portP of a main reversing valve correspondingly. A port A and a port B of the main reversing valve are connected with a rod cavity and a rodless cavity of a movable arm hydraulic cylinder correspondingly. A port T of the main reversing valve is connected with a port P of the second hydraulic motor. A port T of the first hydraulic motor and a port T of the second hydraulic motor are connected with theoil tank. The second hydraulic motor is connected with a second gear sequentially through a third clutch, the second fly wheel, a fourth clutch and a third speed changer. The first gear sleeves a shaft between the one-way clutch and the first speed changer and is engaged with the second gear. The system can conduct energy recycling and reutilizing.

The invention discloses a phased-array antenna subarray power supply circuit and an electric appliance with the power supply circuit. The circuit comprises an input connector, a protection circuit, aninput filter circuit, an input energy storage circuit, a DC converter array circuit, an output energy storage circuit and an output filter circuit. The DC converter array circuit converts a high-voltage electric signal passing through the input energy storage circuit into a low-voltage electric signal; according to the low-voltage electric signal, the output energy storage circuit meets the requirement of the phased-array antenna for instantaneous power in an array plane pulse working state, and the output filter circuit improves the quality of an output signal of the low-voltage electric signal passing through the output energy storage circuit. By means of the mode, after the high-voltage electric signals are converted into the low-voltage electric signals, assemblies on the array face of the phased-array antenna can effectively work, and the size and the weight of the phased-array antenna can be reduced.

The invention discloses equipment for supplying the hybrid power by utilizing the solar energy based on a multi-phase alternating method. The equipment comprises a solar power generation part, a storage battery part, a power supply circuit and a power supply control part. The solar power generation part is used for generating power by utilizing the solar energy. The storage battery part is used for storing and providing the current. The power supply circuit is electrically connected with the solar power generation part and the storage battery part and comprises a load end used for consuming the electric power, and a power supply end used for generating power for daily use. The power supply control part is used for controlling a power supply and a loop and providing the current from the solar power generation part to the storage battery part/the load end/the power supply end, or from the power supply end to the storage battery part/the load end. The power supply circuit part is designedto charge/discharge the storage battery part through the multi-phase alternating method, so that the voltage is reduced or increased. According to the invention, based on the application of the multi-phase alternating method, the demand of the maximum power is reduced in the charging/discharging process of the storage battery part.

The invention discloses a series hybrid power system for an excavator boom. An output shaft of a prime motor is connected with a transmission shaft of a hydraulic pump, a port S and a port P of the hydraulic pump are respectively connected with an oil tank and a port A of a first one-way valve, a port B of the first one-way valve is respectively connected with the port P of a hydraulic motor and the port B of a second one-way valve, and a port T of the hydraulic motor and the port A of the second one-way valve both are connected with the oil tank; the hydraulic pump is connected with a transmission shaft at one end of a flywheel through a one-way clutch, a first transmission and a first clutch, and the transmission shaft at the other end of the flywheel is connected with the transmission shaft of the hydraulic pump/motor through a second clutch and a second transmission; the port S and the port P of the hydraulic pump/motor are respectively connected with the oil tank and the port P ofa main reversing valve, the port A and the port B of the main reversing valve are respectively connected with a rod cavity and a rodless cavity of a boom hydraulic cylinder, and the port A and the port B of a third one-way valve are respectively connected with the oil tank and the rod cavity of the boom hydraulic cylinder. The system provided by the invention can recycle energy of the boom, and also can perform efficient reuse of the energy.