124results about How to "Eliminate phase difference" patented technology

A clock recovery circuit and a method for reducing electromagnetic emission (EMI) and increasing an attainable clock frequency includes a spread spectrum clock (SSC) generator that receives an input clock signal and generates a frequency-modulated clock signal, and a zero-delay buffer circuit that receives and buffers said modulated clock frequency signed to generated an output clock signal. The frequency-modulated clock signal and the output clock signal are phase-aligned such that there is no phase difference between the output clock signal and the modulated frequency clock signal. The clock recovery circuit also includes a delay-locked loop (DLL) circuit that reduces related art jitter and skew characteristics, and a phase detector circuit that eliminates phase ambiguity problems of a related art phase detector.

The invention relates to a rapid locking method for a full digital phase-locked loop, which is used for locking the frequency of the full digital phase-locked loop comprising a phase detection discriminator, a time-to-digit converter, a digital filter, a digital controlled oscillator and a frequency divider in a short time. The method is characterized by comprising the following steps: finding a control word controlling the frequency of the digital controlled oscillator by a designed algorithm; dividing the frequency of a clock output by the digital controlled oscillator which is controlled bythe control word to obtain a divided-frequency clock with the frequency approximate to a reference clock frequency; and then, controlling the digital controlled oscillator to lock based on a phase difference between the reference clock and the divided-frequency clock which are distinguished by the phase detection discriminator. The full digital phase-locked loop is provided with a rapid frequencycapture loop and a phase-locked loop which alternately work, i.e. firstly, the rapid frequency capture loop finishes frequency capture, and then, the phase-locked loop finishes accurate locking.

The invention discloses a phase compensation method of a quantum key distribution system. The phase compensation method comprises the step A of phase estimation, wherein the angle of phase drift is calculated through a cross-correlation solving mode, and the step B of phase compensation, wherein phase compensation is carried out on data according to the estimated phase drift value. In the method, only simple mathematical statistics needs to be carried out on the received data in the phase estimation step, and calculation is easy and convenient. The phase compensation step is carried out at a sending send, a receiving end only needs to send the phase shift value back to the sending end in the whole compensation process, and security of the data cannot be influenced. Phase compensation based on data levels instead of traditional hardware compensation based on signals is adopted, and a few software functions and communication interfaces can be added to a platform of a traditional quantum key distribution system to achieve the method.

The invention discloses a power factor correction (PFC) control circuit and method and a PFC circuit. The PFC control circuit is used for controlling the connection and disconnection of a main switch tube of a direct current (DC)/DC converting circuit in the PFC circuit. The PFC circuit also comprises a rectifier bridge, wherein the rectifier bridge is used for rectifying power grid voltage; output ends of the rectifier bridge are correspondingly connected with the input end of the DC/DC converting circuit; and a filtering capacitor is arranged between two input ends or two output ends of the rectifier bridge. The PFC control circuit comprises an error amplifying unit, a multiplying unit, a comparator, a driving control unit and a voltage sampling correction unit, wherein the voltage sampling correction unit is used for sampling the input voltage of the DC/DC converting circuit, performing phase lag on a first input voltage sampling signal acquired by sampling to acquire a second input voltage sampling signal, and outputting the acquired second input voltage sampling signal to a first input end of the multiplying unit. By the technical scheme, the power factor (PF) value of the PFC circuit can be increased, and the total harmonic distortion (THD) value of the PFC circuit can be reduced.

An outboard motor steering control system operates at starting of the engine to compare the output of the steering wheel angle sensor which indicates the turned angle of the steering wheel and the output of the rotation angle sensor which indicates the rotation angle of the swivel shaft, determines whether there is a phase difference in steering angle therebetween, responds to any phase difference found by, at the time the boat operator turns the steering wheel, controlling the operation of the actuator connected to the swivel shaft so as to eliminate the difference, and further operates to inform the boat operator of the difference. Owing to this configuration, the difference can be eliminated without causing the boat operator to experience an unnatural feel.

In a machine and a method for manufacturing composite filters (F1, F2) for cigarettes or the like, a feed conveyor (S) supplies filter groups (G1, G2) in pairs to two respective feed lines (L1, L2) of a station (16) for forming two continuous filter rods (B1, B2); the machine (100) comprises at least one transfer device (DT) by which the filter groups (G1, G2) are taken up from the feed conveyor (S) and directed along the feed lines (L1, L2), and at least one release device (R), operating along the two feed lines (L1, L2), by which the two filter groups (G1, G2) are taken up from the transfer device (DT) and released in phase one with another along the selfsame feed lines (L1, L2); the rate at which the filter groups (G1, G2) are released by the release device (R) is governed according to the phase value of at least one of the continuous filter rods (B1, B2) relative to the cyclic cutting operation whereby the two filter rods (B1, B2) are cut transversally to make the composite filters (F1, F2).

A method for testing satellite signal receiver antenna is provided. The method includes: determining a satellite constellation state indicating status of a plurality of satellites in a satellite constellation; calculating, based on the determined satellite constellation state, initial positions of a plurality of satellite antennas that are used for emulating the satellite constellation; moving the plurality of satellite antennas to the initial positions of the plurality of satellite antennas; calibrating a phase delay of each of the plurality of satellite antennas; broadcasting, by the plurality of satellite antennas, satellite signals to test a satellite signal receiver antenna; determining a movement plan for the plurality of satellite antennas based on the satellite constellation state; and moving the plurality of satellite antennas based on the movement plan to emulate a propagation of the satellite constellation.

The invention relates to a sound absorption coefficient field measuring device. The device is characterized by comprising a measuring probe and a fixed handle. The measuring probe comprises a probe substrate, a microphone measuring probe and a material space measuring probe; one end and the middle part of the probe substrate are respectively provided with a chute, and a position measuring scale is arranged on the probe substrate between the two chutes; the other end of the probe substrate is articulated with the fixed handle; the microphone measuring probe comprises a microphone fixing tube which is arranged in a chute arranged at the upper part of the probe substrate in a sliding way by a guide block; a BNC joint is arranged at the front end of the microphone fixing tube, a microphone position staff is arranged at the rear end, a tip of the microphone position staff is coincident with the axis of a microphone and points at the position measuring scale; and the material space measuring probe is transversely arranged on the chute arranged at the middle part of the probe substrate in a sliding way by the guide block, and the center of the material space measuring probe is provided with a material space position staff which also points at the position measuring scale. The measuring device has the advantages of simple and compact structure, convenient use and low cost, and can be widely applied to sound absorption coefficient measurement of various sound absorption materials.

The invention discloses a low-hybrid-wave antenna phase compensation method. Three lines of main waveguide of an antenna unit respectively comprises a section of linear transitional waveguide with the gradually-widened narrow edge. A main waveguide is divided into N/2 sections of branch waveguide through E face branch waveguide of a first phase shift section, then, the main waveguide is divided into N sections of branch waveguide in a second phase shift section, and N is an even number. Phase shifters are arranged through two methods respectively, and the 180-degree phase difference brought by an output port in the middle line of a mode converter and the phase difference caused by the waveguide length difference which is caused by an antenna port arc notch can be eliminated. The low-hybrid-wave antenna phase compensation method can be applied to the design of a Tokamak low-hybrid-wave multi-junction waveguide antenna and an active and passive staggered multi-junction waveguide PAM antenna of a nuclear fusion experimental device and can be used for eliminating various phase differences of the antennas and improving the coupling performance and current drive efficiency of the antennas and plasmas.

The amplitude modulation wave phase-locked laser ranging method and device belong to the laser ranging technology; the present invention uses an amplitude modulated light wave phase-locked amplifier at the target end of the active phase ranging device; the measuring end of the ranging system sends a beam of light intensity through Sinusoidally modulated beam, the target end of the ranging system performs phase-locked amplification on the received amplitude modulated optical signal from the measurement end, generates a laser signal with the same modulation frequency as the laser signal from the measurement end and has a constant difference, and sends it back to the measurement end. The measurement terminal realizes the distance measurement by detecting the phase difference between the sending and receiving signals and combining the constant phase difference; it has the characteristics of high ranging accuracy.

The present disclosure provides a method for determining a Doppler frequency shift of a wireless signal directly reflected by a moving object. An example method includes eliminating a random phase shift caused by non-synchronization between a wireless transmitting device and a wireless receiving device by using conjugate multiplication of the channel state information (CSI) on two antennas, thereby obtaining the complete Doppler frequency shift information from the phase information of the channel state information. The example method eliminates the effect on the Doppler frequency shift caused by frequency information of static paths in a manner of removing the mean, thereby obtaining an accurate frequency estimation of the moving object. A Multiple Signal Classification (MUSIC) algorithm may be used to estimate a frequency spectrum according to practical sampling intervals to avoid an effect on the frequency estimation accuracy caused by uneven sampling rate in a practical wireless transceiving system.

In a display apparatus that receives and then displays R, G, B signals transmitted from a computer via a cable, when correcting phase differences between the respective signals that are generated while the signals are being transmitted, the phase correction amount can be reduced and phase adjustment performed automatically by a simple circuit structure. In a phase detection section, the phases of R, G, B signals input from a PC relative to a horizontal synchronization signal HD are detected, and based on the result of these detections, a calculation section 11 determines which color signal from the R, G, B signals has the greatest delay relative to the horizontal synchronization signal HD, and also determines the phase differences of the remaining two signals relative to the most delayed signal. A control section then performs control such that the delay amount of the delay circuit of the most delayed color signal out of the delay circuits is set to zero, and the delay amounts of the delay circuits of the remaining two color signals are controlled in accordance with the above phase differences.

The invention provides a control circuit in a power factor correction circuit. The control circuit comprises an output feedback module, a waveform generating module, a control signal generating module and a drive control module, wherein the output feedback module is used for sampling output electric parameters of the power factor correction circuit PFC, comparing the sampled output electric parameters with a preset value, and outputting a feedback signal Vf according to the compared result; the waveform generating module is used for generating a second signal I2 associated with current of a filter capacitor which is in parallel connected to an input end and/or an output end of a rectifying bridge; the control signal generating module is used for outputting a control signal according to the feedback signal Vf output by the output feedback module and the second signal I2; and the drive control module is used for driving a main switch tube according to the control signal output by the control signal generating module, and controlling switch-on time of the main switch tube. And therefore, phase difference of Iin and Vin due to phase difference caused by the filter capacitor is eliminated.

The invention discloses a network side power factor and harmonic suppression strategy of an isolated AC-DC matrix converter. The method comprises the steps of firstly, introducing a virtual capacitor,and enabling virtual capacitor current generated under different loads to completely or partially compensate a phase difference between network side voltage and current caused by an input filter, sothat the IAMC works in a network side unit power factor state or a maximum achievable unit power factor (MAPF) state; and secondly, introducing a virtual resistor and connecting with a filter capacitor in parallel to form active damping control, and enabling the generated virtual damping current to effectively reduce harmonic waves of network side current under the condition of not increasing extra loss; and finally, compensating the virtual capacitance current and the virtual damping current to the reference current, and calculating a new modulation coefficient and a phase angle to realize acoordination control strategy of current space vector and phase shift control. According to the invention, the network side power factor of the converter can be controlled, the harmonic content of network side current is reduced, direct-current side ripple waves are suppressed, and it is guaranteed that the system has good input and output performance.

The invention discloses a passive target positioning method based on a multipath signal spatial spectrum, and the method comprises the steps: setting a reader and tags, measuring the phase and amplitude between each tag and the reader A in a monitoring range, and enabling the phase and amplitude values to serve as the reference data; randomly setting a target in the monitoring range, measuring the phase and amplitude between each tag and the reader, and enabling the phase and amplitude values to serve as comparison data; removing the phase difference of the phase values in the reference data and the comparison data, carrying out the processing of the obtained corrected comparison data and reference data, generating two groups of AOA spectrums, comparing the peaks of all paths in the two groups of AOA spectrums, finding a direction angle, obtaining the range of a target object through the direction angle and the reader, and obtaining the position of the target object through a likelihood function. The method provide by the invention does not need any training mode, and is high in positioning precision.

The invention relates to a phase correction method for arbitrary impulse converter transformer current difference. When a converter transformer is at a no-load status, a phase difference theta exists in positive sequence current of a line side winding and a valve side winding, and the theta is any angle. The phase correction method comprises the following steps: selecting a side winding of the converter transformer as a reference winding, and performing phase correction to the other side winding current towards the reference winding current; using a phase relationship of three-phase current sequence components on the two sides of the converter transformer, and a conversion method of the sequence components and the phase components to calculate differential current. Due to the adoption of the phase correction method, the differential current of any impulse converter transformer can be calculated, so that a high-voltage direct-current power transmission system safely and stably operates for a long time; the method has the advantages of easily applying and preventing the generation of false differential current. Moreover, according to the phase correction method, a problem that the phase correction is only achieved when the same-phase current phase difference on the two sides of the converter transformer is 30 N (N is an integral number) as the current phase correction method adopts the adding and subtracting of the three-phase current vectors on certain side can be solved.

The invention relates to a signal transmission method. The method includes determining a target device; transmitting 5G signals to the target device, wherein the 5G signals include synchronization blocks used for carrying physic broadcast channel, main synchronization signals, auxiliary synchronization signals and demodulation reference signals, wherein the demodulation reference signals and the auxiliary synchronization signals are used for acting as reference of physic broadcast channel demodulation results. Through setting the demodulation reference signals in the synchronization blocks, both of the auxiliary synchronization signals and the demodulation reference signals can be taken as reference for demodulation results of physic broadcast channels, so that phase of the demodulation results after adjustment and phase of the synchronization blocks before modulation of the transmission device can be ensured to be identical as much as possible, influence on synchronization block phases due to factors including Doppler effect and the like in a signal transmission process can be eliminated in an extremely large extend.

The invention discloses a method for outputting signals by multiple screen processors. The method comprises the following steps of: according to synchronizing signals, modulating wireless signals, wherein the frequencies of the synchronizing signals are the same with those of field synchronizing signals of video signals of the screen processors; transmitting the wireless signal to each screen processor; receiving the wireless signal by each screen processor; according to the synchronizing signals demodulated from the wireless signals, synchronously outputting the video signals. The invention also discloses a device for outputting the signals by multiple screen processors. According to the method and the device for outputting the signals by multiple screen processors, each screen processor can correctly receive the synchronizing signals; the synchronous output of the video signals of the screen processors is implemented; and the configuration flexibility of a multiscreen display system is improved.

A delay circuit device is described which includes a first delay circuit series that can extract output from any position on a transmission path of a signal, a second delay circuit series that can enter input from any position on a transmission path of a signal, and a control circuit having an input terminal, an output terminal, and an input/output control terminal for signals. The first delay circuit series and the second delay circuit series are arranged such that their signal transmission paths are aligned in opposite directions; the output of the first delay circuit series and the input of the second delay circuit series passing by way of the control circuit and being sequentially connected to each other from the side close to the input of the first delay circuit series and from the side close to the output of the second delay circuit series. A first signal is inputted to the first delay circuit series, a second signal is inputted to the control circuit at an arbitrary subsequent time, and the first signal in the first delay circuit series is transferred to the second delay circuit series.

A multi-domain liquid crystal display (LCD) includes multiple effective pixel electrodes, dummy pixel electrodes and auxiliary electrodes. The effective pixel electrodes are regularly arranged in an array of row and column, and the array of effective pixel electrodes constitute an active display area of the multi-domain LCD. The dummy pixel electrodes are provided outside the active display area and arranged at least on the side of an outermost row or outermost column of the array of effective pixel electrodes. Each auxiliary electrode is positioned next to one side of an effective pixel electrode or a dummy pixel electrode to produce fringe fields and is connected to another effective pixel electrode controlled by a preceding or a succeeding signal line to allow all effective pixel electrodes to have substantially the same coupling capacitance.

The invention provides a display panel, a display screen and a display terminal. The display panel comprises a substrate and a plurality of film layers arranged on the substrate in sequence, at leastone film layer is internally provided with a graphical structure, a first film layer in the film layers is provided with a groove, and a compensation layer is arranged in the groove; when external incident light enters the display panel in the direction perpendicular to the surface of the substrate, the path of the light penetrating through the groove of the first film layer and the compensation layer is a first path, the other paths are second paths, and the difference value of the optical paths between the two paths is integral multiples of the wavelength of the external incident light. In the scheme, the difference value between the two paths is integer multiples of the wavelength of the light; therefore, after the light rays are emitted from the display panel through the two paths, thephase difference is zero, the diffraction phenomenon caused by the phase difference is eliminated, image distortion caused by diffraction cannot be generated after the light rays penetrate through the display panel, and the definition of an image sensed by a camera behind the display panel is improved.