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Method for adopting high-accuracy pulse per second frequency multiplication to produce sampling pulse based on FPGA

A sampling pulse, second pulse technology, applied in the direction of program control, instrument, computer control, etc., can solve the problem of low sampling accuracy, and achieve the effect of improving sampling accuracy, simple and easy operation, and reducing occupancy.

Active Publication Date: 2014-07-23
STATE GRID CORP OF CHINA +4
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Problems solved by technology

[0003] The purpose of the present invention is to address the deficiencies in the prior art and provide a method for sampling pulses based on FPGA-based high-precision second pulse frequency multiplication, which solves the problem in the prior art that the sampling pulses directly provided by the clock oscillator lead to low sampling accuracy. technical problem

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  • Method for adopting high-accuracy pulse per second frequency multiplication to produce sampling pulse based on FPGA

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Embodiment Construction

[0013] The method for multiplying the frequency of the second pulse to generate the sampling pulse provided by the present invention, wherein the actual synchronous second pulse is output by an external clock, and the ideal synchronous second pulse is generated by the frequency multiplication of the active clock oscillator combined with the phase-locked loop technology in the FPGA chip, and the pulse counter Count standard samples. If sampling if actual synchronous second pulse is faster than ideal synchronous second pulse, then pulse counter increases a standard sampling pulse to carry out counting compensation when counting, otherwise, reduces a standard sampling pulse, the present invention will actual synchronous second pulse and ideal synchronous second pulse The total time deviation is evenly distributed in multiple time slices, which reduces the time deviation between the actual sampling pulse and the ideal sampling pulse. Taking the actual synchronous second pulse coun...

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Abstract

The invention discloses a method for adopting high-accuracy pulse per second frequency multiplication to produce sampling pulses based on an FPGA in the technical field of electric power system measurement and control and aims at solving the technical problem that sampling pulses provided by an oscillator in the prior art enable the sampling accuracy to be low. In the method, an actual synchronous pulse per second counting value is compared with an ideal synchronous pulse per second counting value, deviations and sampling frequencies are subjected to accumulation calculation, the correction situation of a pulse counter is judged according to an accumulation calculation result, accordingly total deviations of actual synchronous pulses per second are averagely distributed in actual sampling pulses, sampling pulse errors are remarkably decreased, and reliable and stable sampling pulse signals are provided for analog-digital signal acquisition. In addition, the method is simple and easy to operate, occupied FPGA chip resources are decreased, and the running speed and reliability of the FPGA are improved.

Description

technical field [0001] The invention relates to a method for realizing high-precision sampling pulse output, in particular to a method for generating sampling pulses based on FPGA-based high-precision second pulse frequency multiplication, and belongs to the technical field of power system measurement and control. Background technique [0002] With the rapid development of the power system, the capacity and structure of the power grid are undergoing tremendous changes, and the instrumentation industry is also constantly improving. In power quality monitoring, there are generally two methods for sampling and calculating basic power parameters, namely AC sampling method and DC sampling method. The DC sampling method only performs a proportional conversion on the sampling value, and its measurement accuracy is limited, with large errors and instability. Therefore, AC sampling is usually required to obtain high-precision and high-stability electrical parameters. During AC sampl...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/042G01R19/25
Inventor 高磊陈久林袁宇波卜强生宋亮亮李澄葛永高陆玉军倪时龙戴太文
Owner STATE GRID CORP OF CHINA
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