Sampling pulse generation method and device

Abstract

The invention discloses a sampling pulse generation method. The method includes the steps of receiving crystal oscillator pulse signals and standard pulse signals; counting amount N of the crystal oscillator pulse signals in a current period of standard pulse signals; according to the amount N of the crystal oscillator pulse signals, acquiring amount M of the crystal oscillator pulse signals, which corresponds to the amount N and which is used for setting a sampling pulse signal period in a next standard pulse signal period; using the period of the crystal oscillator pulse signals in the amount M as a sampling pulse signal period T in the next standard pulse signal period. According to an interval where the crystal oscillator pulse signals with the amount N received in a synchronous pulse signal period locate, the amount M of the crystal oscillator pulse signals, needing to be included in the sampling pulse signal period, is determined, the interval T of the sampling pulse signals is determined, and accurate sampling is achieved. The invention further discloses a sampling pulse generation device.

Description

technical field [0001] The invention relates to a method and device for generating sampling pulses, in particular to a method and device for generating sampling pulses applied in the field of substation automation. Background technique [0002] In the field of substation automation, each substation has a unified time synchronization device, and the protection equipment and monitoring equipment in the station require synchronous sampling, that is, different channels of the same equipment and different equipment require simultaneous sampling. In order to ensure that each sampling point is sampled at the same time, in addition to using the synchronization signal provided by the station to synchronize the sampling time of the first sampling point of each synchronization cycle, the sampling rate of each device is also required to be consistent. Current equipment generally adopts a high-precision temperature-compensated crystal oscillator (TCXO) to provide an accurate clock and us...

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Problems solved by technology

[0003] The traditional sampling pulse generation scheme has some disadvantages: the accuracy of the sampling pulse generated by the traditional method depends on the accuracy of the TCXO; when the traditional algorithm selects a TCXO, it is necessary to select a TCXO whose frequency is an integer multiple of the sampling frequency, such as selecting 12.8M TCXO can achieve 12.8K, 6.4K and other sampling rates, but to ensure accuracy when realizing 9.6K and other sampling rates, you need to choose 11.0592M TCXO; TCXO has aging problems, and the annual aging rate is generally between 2-5ppm time, it will affect the accuracy of pulse generation, the longer the year, the greater the accuracy error

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