90 results about "Small peak" patented technology

The invention relates to a power battery-super capacitor hybrid power system for electric automobiles, belonging to the electric automobile technical field. The power battery-super capacitor hybrid power system for the electric automobiles comprises a power battery pack, a motor controller and a 24V storage battery, a boost DC /DC converter, a bi-directional DC/DC converter and a super capacitance group, wherein, the low voltage end of the boost DC /DC converter is connected with the output end of the power battery pack, the high voltage end of the boost DC /DC converter is connected with the motor controller; the super capacitance group and the high voltage end of the bi-directional DC/DC converter are directly hitched with the high voltage end of the boost DC/DC converter, and the low voltage end of the bi-directional DC/DC converter is connected with the 24V storage battery. The power battery of the power battery-super capacitor hybrid power system for the electric automobiles has smooth output current, small peak current, high discharge efficiency and long service life; when the battery pack SOC is lower, the hybrid system still ensures the normal power output capability; and the super capacitance can directly absorb the braking feedback energy and has high energy conversion efficiency.

In a first aspect, in a Primary Side Regulation (PSR) power supply, some primary current pulses are used to forward bias an output diode such that an auxiliary winding voltage can be properly sampled after each pulse. The samples are used to regulate the power supply output voltage (VOUT). Other primary current pulses, however, are of a smaller peak amplitude. These pulses are not used for VOUT regulation, but rather are used to determine whether the VOUT has dropped. In a second aspect, a transient current detector circuit within the PSR controller integrated circuit detects whether an optocoupler current has dropped in a predetermined way. If the TRS current detector detects that the optocoupler current has dropped, then the power supply stops operating in a sleep mode and is made to operate in another higher power operating mode in which the power supply switches.

An arc fault circuit interrupter includes separable contacts, an operating mechanism, a current sensor sensing current flowing through the contacts and outputting a sensed current, and a processor determining and storing peak values of the sensed current for plural half-cycles. The processor provides arc fault detection, determines whether a first predetermined plurality of half-cycles occur in succession and correspond to non-unity power factor, and responsively inhibits the detection for a first predetermined time, and whether a second predetermined plurality of half-cycles occur in succession, each with smaller peak amplitude than that of an immediately preceding half-cycle of like or differing polarity, and responsively inhibits the detection for a second predetermined time. The processor determines that the detection is not inhibited for the first and second predetermined times, and responsively indicates that any of the half-cycles having a peak amplitude greater than a predetermined amount is a parallel arc.

The invention belongs to the technical field of power machine, and in particular relates to a starting system of a motor type free piston internal combustion power generation device. The invention provides two types. The first type comprises a first free piston internal combustion engine, a second free piston internal combustion engine, a connecting rod and a linear motor, wherein the first free piston internal combustion engine, the linear motor and the second free piston internal combustion engine are sequentially connected with one another, and the whole mechanism is eudipleural. The second type is provided with a first starting coil and a second starting coil. Three starting schemes are provided according to two system structures. The first starting scheme is simple and is easy to control, and an extra linear motor mode conversion circuit is not needed; the number of parts in the second starting scheme is small, so that the starting time is short; and according to the third starting scheme, the linear motor with relatively small peak value can be matched, and the size of the whole device can be reduced. A simulation and experiment result shows that the free piston internal combustion power generation device can be quickly started within one second.

The invention discloses a method and a device for online monitoring and positioning a turn-to-turn short circuit for a rotator of a water wheel generator, belongs to monitoring and protecting technology of the rotator of the water wheel generator, and aims at providing three types of methods and devices capable of carrying out online monitoring and positioning of the turn-to-turn short circuit for the rotator of the water wheel generator. The method comprises the following steps: synchronously acquiring inductive potential waveform of numbered and positioned magnetic poles through an induction coil in real time; sending the inductive potential waveform to a microcomputer and calculating an average value ep of a peak value of magnetic pole inductive potential, a pole average value vp; and comparing the smallest peak value e min of the inductive potential and the smallest pole value v min of the inductive potential with the ep and vp and making the judgment. The device comprises a positioning identification label (11), first and second separated circuits (13, 7), the microcomputer (3), a position sensor (12), a filtering amplifying circuit (8), an A/D transferring circuit (4), a magnetic pole induction coil (9), a frequency dividing circuit (15), a wave-shaping circuit (16) and a display (5), and a device is additionally provided with two pole amplifying circuit (6) on the basis of the devices.

The invention relates to a method for estimating the medium quality factor by utilizing the peak instantaneous frequency of the envelope of the seismic signal, which includes the following steps: 1) dividing the medium into several thin plates with the thickness of the distance between two adjacent geophones in the well; 2) for the i-th A small thin plate, use the constant phase wavelet to approach the direct wave received at its top, and determine its modulation frequency σi and energy attenuation factor δi, and calculate the ratio ηi=σi/2πδi; 3) Calculate the travel of the seismic wave on the i-th small thin plate Time 4) Calculate the instantaneous frequency of the received signal at the upper and lower interfaces of the i-th thin plate; 5) Calculate the change Δfp(i)=fp(0)-fp(τi) of the envelope peak instantaneous frequency in the i-th small thin plate; 6 ) Substituting σi, δi, τi and fp(0)-fp(τi) into the analytical relationship between the envelope peak instantaneous frequency and the quality factor Q value to calculate the quality factor Q value of the i-th small thin plate: 7) Repeat steps From 2) to 6), calculate the quality factors of other small thin plates in turn; 8) use the quality factor Q value to predict the oil and gas of the reservoir.

The invention discloses an array plane layout method for a space-borne SAR (Synthetic Aperture Radar) phased-array antenna and relates to a radar antenna technology. The array plane layout method comprises the following steps of: under the condition that the number of azimuth T/R (Transmit/Receive) assemblies (or phase shifters) of the phased-array antenna is not changed, dividing an array plane of the antenna into a plurality of unequal subarrays along the range direction; staggering along the azimuth direction of the antenna by using each subarray as the unit, wherein a staggering distance is about one second of a spacing of each two adjacent T/R assemblies in the range direction; and discretizing single big-peak scanning grating lobes of a regular rectangular lattice structure into a plurality of distributed small-peak grating lobes, so that the peaks of the scanning grating lobes in the azimuth direction are greatly reduced and the influence of the big-peak grating lobes on a radar system is reduced. The larger the number of the subarrays which have different spacings and are formed by dividing the antenna in the range distance is and the more the types of spacings between the subarrays are, the better the effect of discretizing the big-peak grating lobes is, however, the complexity of layout of a feed network of the phased-array antenna, the design of an antenna frame and the like are also increased. An array plane layout scheme suitable for the engineering application is obtained by comprehensively considering the complexity of the layout of the feed network and the design of the antenna frame and the effect of discretizing the scanning grating lobes in the azimuth direction.

A fluid dynamic pressure bearing composed of a cylindrical sintered compact includes: a thrust region which is formed on an end surface of the bearing and receives at least a thrust load; a roughed portion having small peaks and valleys formed on the thrust region; and thrust recesses for generating thrust fluid dynamic pressure, which are formed on the thrust region.

The invention relates to a coal-gas combined heating supply method, belonging to HVAC area. The first step of said method is that small peak-shaving boiler with burning gas, as peak-shaving thermal source, running with the parallel of central heat network, is set in each thermal station of civil thermal network with the heat source, which is the boiler in the huge heat supply or coal-burning region. Said secondary backwater is that first heat exchanger obtains quantity of heat generated by the boiler of coal-burning thermal power station or huge coal-burning region and transmitted by the first pipe network, and then it is heated furthermore by small gas-burning peak-shaving boiler so that independent adjusting in time on each heat supply region is accomplished. Thermal resource only bears the basic load of heat supply and the lack of heat is compensated by small gas-burning peak-shaving boiler in each thermal power station. The heat value is changed as the relation of climate and requirement changes. Said first network also bears adjusting action.

Provided is a transmission method of multi-carrier data. According to the transmission method, data are transmitted by means of at least two sub carriers and at least two component channels. The transmission method of the multi-carrier data is characterized in that each component channel for transmitting data comprises multilevel and multi-rate sub carriers which contain harmonic wave deviation modulation sub carriers. Carriers in the same layer are orthogonal in time domain, the spectrum of one sub carrier is overlapped with the spectrum of another sub carrier in the same layer, and the two sub carriers can not be isolated with a segmentation frequency spectrum and by a filter. Signals are combined in a multiply method through the sub carriers which are overlapped in spectrums in the same layer and the sub carriers which are overlapped in spectrums in an adjacent layer, orthogonal component channels or approximate orthogonal component channels can be distinguished through related demodulation, and the number of the component channels is the product of the number of sub carriers in each layer. The transmission method of the multi-carrier data is further characterized in that by means of the Fourier series and a fraction code rate orthogonal function, the number of the component channels with preset bandwidth and time width is increased, new component channels are added on the basis of the existing component channels, and similar performance is achieved with a smaller peak-to-average power ratio compared with the prior art.

The invention discloses a multi-rate peak clipping method and device. The multi-rate peak clipping method includes that a multi-rate peak clipping device uses a preset first speed rate peak clipping threshold and a preset first peak clipping coefficient to carry out primary digital peak clipping on a multi-carrier superposed signal after performing multi-carrier superposition; the multi-rate peak clipping device uses a preset second speed rate peak clipping threshold and a preset second peak clipping coefficient to carry out secondary digital peak clipping on an interpolated signal after performing signal interpolation. According to the embodiment, the multi-rate peak clipping mode is used for clipping signal peaks, the signal peak recurrence after interpolation can be avoided, the peak clipping effect is good, the peak clipping hardware resource can be saved, the peak clipping performance is improved, and the problems of large peak lifting, peak regeneration, signal quality degradation and the like after the multi-carrier superposition can be solved. The multi-rate peak clipping mode clips large-peak signals through low-speed peak clipping, and the peaks of the reserved small-peak signals are clipped in a high speed in subsequent.

A lithium secondary battery of the present invention has a positive electrode is provided with a positive electrode mix layer that includes a positive electrode active material and a conductive material. The positive electrode mix layer has two peaks, large and small, of differential pore volume over a pore size ranging from 0.01 μm to 10 μm in a pore distribution curve measured by a mercury porosimeter. A pore size of the smaller peak B of the differential pore volume is smaller than a pore size of the larger peak A of the differential pore volume.

The invention provides a sideband-information-free shallow sea underwater acoustic communication pattern selection peak-to-average ratio restraining algorithm based on a frequency reversal mirror technology. At a data sending end, scrambling is carried out on data to be sent through M sets of different scrambling patterns, meanwhile, M sets of different comb-shaped pilot frequency positions are defined as signs, comb-shaped pilot frequency sequences are added to different pilot frequency positions to obtain candidate OFDM symbols, fast Fourier inversion is carried out on the candidate OFDM symbols to a time domain, and the symbol with the smallest peak-to-average ratio is selected as a transmission symbol; at a receiving end, fast Fourier inversion is carried out on received signals, frequency domain received information corresponding to the different comb-shaped pilot frequency positions is extracted to obtain pilot frequency domain response, matching pursuit is carried out on the pilot frequency domain reesponse, M sets of channel frequency domain response are restored, in frequency domain reversion, the cross correlation coefficients of the pilot frequency domain response and the channel frequency domain response is calculated, the value m corresponding to the maximum value in the M correlation coefficients is obtained, and finally descrambling is carried out through serial number information. The algorithm can guarantee the real-time performance and the reliability of an MIMO-OFDM underwater acoustic communication system.

The invention discloses a method for combined power supply based on an industry mean peak-valley difference rate. The method comprises the following steps that the typical industries and the typical day of an area with combined power supply to be carried out are selected; representative users are extracted from the selected typical industries, and statistics is carried out on the peak-valley difference rate of the representative users in the typical day; statistics is carried out on the peak-valley difference rate section of each typical industry to obtain the industry mean peak-valley difference rate; load classification is carried out on the selected typical industries; the industries with the large peak-valley difference and the industries with the small peak-valley difference or the industries with complementary peaks and valleys are classified into the same transformer or transformer substation, and combined power supply is carried out. The influence of load characteristics on a power distribution network and electric energy quality is fully considered, and the problems that at present, the uneven loads of the transformer are ubiquitous, and the capacity-load ratio of the transformer substation is too low can be effectively solved.

A pressure-sensitive adhesion-processed sheet which can be easily stuck without forming blisters by air-entrapment, is less expensive, can be easily re-stuck, and has favorable working characteristics. The pressure-sensitive adhesion-processed sheet includes a sheet base material and a pressure-sensitive adhesive layer having plural small valleys and plural small peaks.

The present invention relates to an orthogonal spreading code in a code division multiple access (CDMA) mobile communication system, and more particularly, to a method for generating and allocating code or code pairs on the basis of an orthogonal code set, which is generated using orthogonal spreading codes, so as to reduce a peak-to-average power ratio and enlarge the length of an interference free window. In accordance with the invention, at least one orthogonal code set is generated based upon orthogonal spreading codes, one of the at least one orthogonal code set is determined as a representative orthogonal code set, and then the order is allocated according to rules determined based upon the representative orthogonal code set. The codes or code pairs are generated and allocated using the orthogonal spreading codes, so as to reduce a Peak-to-Average Power Ratio or extend the length of an interference free window (IFW).