Synchronization method and system for a sampled signal

CN121643973BActive Publication Date: 2026-04-28ACCUPOWER ELECTRONIC TECH CO LTD OF TAIYUAN
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ACCUPOWER ELECTRONIC TECH CO LTD OF TAIYUAN
Filing Date
2026-02-05
Publication Date
2026-04-28

AI Technical Summary

Technical Problem

Existing wireless energy meters suffer from insufficient synchronization accuracy during field verification, especially in complex field environments where it is difficult to meet the phase synchronization error requirement of <0.01° (0.56μs for a 50Hz system) for 0.05-class energy meters.

Method used

An improved closed-loop PID control method is adopted. By generating and sending a synchronization signal frame, the time compensation amount is determined and sent to the sampling terminal to achieve high-precision time synchronization of multi-channel voltage and current signals. Combined with the bidirectional timestamp method, the transmission delay and clock deviation are accurately separated. An adaptive PID controller is used to adjust the clock compensation parameters to ensure accurate alignment of sampling time.

Benefits of technology

It achieves high-precision time synchronization of multi-channel voltage and current signals, with a synchronization accuracy of within ±0.5μs, meeting the calibration requirements of 0.05-level energy meters, with a phase error of <0.01° and a system time error of <0.56μs.

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Abstract

The application relates to a synchronization method and system of a sampling signal, which comprises the following steps: in response to a synchronization trigger event, generating and sending a current synchronization signal frame; determining a time compensation amount of a current synchronization period; sending the time compensation amount to a plurality of sampling terminals, so that the plurality of sampling terminals can determine a sampling start time according to the time of receiving the current synchronization signal frame and the time compensation amount, and the sampling time of the plurality of sampling terminals is kept synchronized. According to the scheme, high-precision time synchronization of multi-channel voltage and current signals is realized through improved closed-loop PID control, the synchronization precision is within + / -0.5 mu s, and the 0.05-level electric energy meter calibration requirement is met.
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Citation Information

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