33results about How to "Achieving Phase Synchronization" patented technology

The invention discloses a multi-channel high-speed digital-to-analogue converter (DAC) synchronization method, which comprises the following steps of: first generating a digital signal source reference signal, a synchronous clock signal and a resetting signal by using a field programmable gate array-MASTER (FPGA-MASTER), simultaneously transmitting the signals to an FPGA-SLAVEP and a DACM, and roughly adjusting multi-path delay, wherein P and M are positive integers; then performing FPGA-MASTER synchronous clock phase discrimination in the FPGA-SLAVEP, and regulating a phase difference to 0 by using a fine delay module; and finally performing DACM reference clock phase discrimination in the FPGA-SLAVEP, and regulating a phase difference to 0 by using the fine delay module. Output signals can be subjected to phase synchronization, a plurality of FPGAs and a plurality of high-speed DACs can be simultaneously cascaded without the limitation of clock speed of the DACs, and FPGA-SLAVEPs are used for performing phase discrimination and phase regulation on the FPGA-MASTER and the DACs to make the phases of data of the FPGA-MASTER, the FPGA-SLAVEs and the DACs consistent, so that the time sequence of each path of DAC is completely synchronous and controllable, working efficiency is improved, and a signal output bandwidth is expanded.

The invention discloses an optical fiber phase synchronization system based on optical active compensation, comprising: a frequency reference, a phase-locked frequency multiplier, a pulse generator, a laser, a 1×2 optical coupler, a polarization scrambler, a circulator, and an optical delay line , optical fiber, demultiplexer, photodetector, radio frequency amplifier, pulse distribution amplifier, radio frequency power divider, phase detector, time interval counter, delay processing unit, drive circuit. The present invention can ensure that the frequency signal phases are consistent under operations such as shutdown and restart or optical fiber routing change, and realize phase synchronization, thereby improving the coherence of time-frequency transmission and meeting the requirements of coherent detection applications such as distributed radar arrays.

The invention discloses a time-division power multiplier and its realization method. The time-division power multiplier includes a voltage processing circuit, a current processing circuit, an analog switch, a filter and a V / f converter, and the voltage processing circuit includes a conditioning circuit 1. Phase synchronization circuit, triangular wave generator and pulse width modulation circuit. The present invention uses signal conversion and phase-locking technology to correlate the measured signal with the triangular wave generator of the time-division power multiplier, and realize the synchronization of the triangular wave generator of the time-division power multiplier with the entire period of the measured signal, so that the two The phase difference in the transformation of the measured AC product is reduced, thereby improving the accuracy of the power / electric energy measurement results, and improving the accuracy of the time-division multiplier measurement technology to meet most active power / electric energy measurement requirements.

The present invention provides a phase synchronization method, device and terminal, which relate to the technical field of time service. The phase synchronization method includes: sending a first clock signal to a receiving device; detecting the first clock signal and the third clock sent by a zero-delay module The phase difference of the signal; through the zero delay of the second clock signal, and the second clock signal is fed back to the timing device; the ratio of the first path delay and the second path delay is also set as a preset value, according to the preset Set the value and the phase difference to obtain the phase-shifting phase value; realize the phase-shifting of the second clock signal according to the phase-shifting phase value, thereby realizing the phase alignment of the first clock signal and the output signal; the present invention can realize the output signal of the timing device and the output of the receiving device The phase synchronization of the signal reduces the error introduced by the phase and improves the timing accuracy.

The present application relates to the technical field of wireless communication, and discloses a device for recovering a clock signal. Including: a differential input signal module, which is used to obtain the antenna voltage and generate a differential input signal according to the antenna voltage; a pre-amplification module, the first end of which is electrically connected to one end of the differential input signal module; the pre-amplification module is used to amplify the differential input signal; A comparator, one end is electrically connected to the second end of the pre-amplification module, the comparator is used to compare the amplified differential input signal to obtain a clock signal; the negative feedback module, the first end is electrically connected to the other end of the differential input signal module, The second end of the negative feedback module is electrically connected to the third end of the pre-amplification module, and the third end of the negative feedback module is electrically connected to the other end of the comparator; the negative feedback module is used to perform the amplification parameter of the differential input signal according to the clock signal adjustment to achieve recovery of the clock signal. The application also discloses a method for recovering a clock signal and an NFC chip.

The invention discloses a method for measuring and compensating a power quality device. The method comprises the steps of: obtaining the fundamental wave and harmonics of the power quality device after harmonic analysis; obtaining the theoretical conversion coefficient of voltage and the theoretical conversion coefficient of current; obtaining the automatic Calibrate the voltage amplitude compensation coefficient, automatically calibrate the current amplitude compensation coefficient, automatically calibrate the voltage phase compensation coefficient and automatically calibrate the current phase compensation coefficient; obtain the voltage interval amplitude compensation coefficient and the current interval amplitude compensation coefficient; obtain the voltage frequency phase compensation coefficient and current frequency phase compensation coefficient; obtain the voltage temperature amplitude compensation coefficient and current temperature amplitude compensation coefficient; calculate the amplitude and phase of the compensated fundamental wave voltage, the amplitude and phase of the compensated fundamental wave current, and the compensated harmonic The amplitude and phase of the voltage, the amplitude and phase of the compensated harmonic current. The invention can realize the phase synchronization of the power quality device and effectively improve the measurement accuracy of the power quality device.

The invention discloses a phase synchronization method. A second Synthetic Aperture Radar (SAR) receives a first phase synchronization signal sent by a first SAR to obtain a first received signal; the first SAR receives a signal sent by the second SAR The second phase synchronization signal of the second received signal to obtain the second received signal; determine the peak phase difference between the first received signal and the second received signal, and determine the compensation phase according to the peak phase difference using a first preset rule; according to the Compensating the phase, performing phase compensation on the echo signal received by the second SAR and generated by the radar signal transmitted by the first SAR. The invention also discloses a phase synchronization device, a storage medium and an information processing device.

The invention provides a phase synchronization detection method and device based on IPT parallel multi-inverter, the device includes n inverter modules, one inverter module is the main inverter module, and the other n-1 inverter modules The inverter module is a slave inverter module; n drive circuits are respectively connected with n external coupled inductors ICT i Parallel connection, 1≤i≤n; each drive circuit includes 4 half-bridge switching arms, 4 half-bridge switching arms are respectively connected with 4 coupling inductors ICT ij Parallel connection, 1≤j≤4; the present invention reflects the synchronous state of the inverter voltage phase according to the error between the inverter output phase and the average value of all output phases, and adjusts the output voltage phase, thereby realizing multiple parallel connections. The function of phase synchronization of inverters and correct measurement of voltage phases of multiple inverters in parallel.

The invention relates to a method, a device and a system for inhibiting ring current between large power PWM (Pulse-Width Modulation) rectification power supply modules. The method comprises steps of collecting three phase input current of a first rectification power supply module to obtain ring current between the first rectification power supply module and a second rectification power supply module; obtaining a phase difference of triangular carrier signals of the first rectification power supply module and the second rectification power supply module according to the ring current; calculating a carrier compensation delay time according to the carrier phase difference; and adjusting a phase of the triangular carrier signal of the first rectification power supply module according to the carrier compensation delay time so as to synchronize phases of the triangular carrier signals of the first rectification power supply module and the second rectification power supply module. The invention can effectively inhibit ring current between two rectification power supply modules, balances loads of the two rectification power supply modules, and improves safety and stability of a power distribution network.