Pulse generation method based on digital frequency synthesis technology

A technology of digital frequency synthesis and pulse generation, which is applied in the direction of instruments, adaptive control, control/regulation systems, etc., can solve the problems of reducing circuit stability and switching noise, and achieve low switching noise, uniform and stable pulses, and precise motion control Effect

Inactive Publication Date: 2017-09-12
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the phase noise can be reduced to a certain extent through the above-mentioned cross-mixing, because it is composed of two different frequency-divided pulses, the circuit will frequently switch between these two frequency-divided circuits, which brings additional problems. A side effect, namely switching noise
Both types of noise are unavoidable, and both noises degrade the stability of the circuit

Method used

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  • Pulse generation method based on digital frequency synthesis technology
  • Pulse generation method based on digital frequency synthesis technology
  • Pulse generation method based on digital frequency synthesis technology

Examples

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Embodiment

[0038] Such as figure 1 As shown, clk_f sys and clk_f' o(Kδ) are the system clock and the actual target output pulse respectively; F sys and F o(Kδ) are system clock and expected target output pulse parameters respectively, unit is Hz; T s _clken is the sampling enable signal; M is the digital period; C is the digital step increment.

[0039] figure 2 in, clk_f sys and clk_f′ o(Kδ) are the system clock and the actual target output pulse respectively; T p is the desired target frequency pulse clk_f o(Kδ) cycle; T 1-Δ is the time of the last pulse of the actual target frequency pulse; T s is a sampling segment time, each sampling segment time is equal; T s _clken is the sampling enable signal; Δ 1 and Δ 2 Respectively, relative to the expected target frequency clk_f of the last pulse in sampling segment 1 and sampling segment 2 o(Kδ) The number of missing pulses.

[0040] A kind of pulse generating method based on digital frequency synthesis technology, its devic...

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Abstract

The invention discloses a pulse generation method based on the digital frequency synthesis technology. The method comprises steps that under a system clock, through an enablement generator, a sampling enablement signal is generated, under the system clock and a sampling enablement clock, firstly, through a digital stepping amount generator, digital stepping amount is acquired through calculation; secondly, through a cycle accumulator, in a digital period scope, cycle accumulation is carried out at the digital stepping amount; and lastly, through a waveform generator, according to a set threshold and a present calculation value of the cycle accumulator, comparison is carried out, and target pulses are generated. The method is advantaged in that the accurate, uniform and stable pulses are generated, and phase noise and switch noise are low.

Description

technical field [0001] The invention relates to the technical field of motion control, in particular to a pulse generation method based on digital frequency synthesis technology. Background technique [0002] In motion control, especially in position control mode, fine interpolation must be performed after rough interpolation, that is, the data obtained by rough interpolation is converted into pulse form through fine interpolation to control the motor, while fine interpolation Complement is pulse generation. Since the motor is directly controlled by pulses, the accuracy of pulse generation will affect the control accuracy of the entire motor in one interpolation cycle. If accurate pulses cannot be generated in each interpolation cycle, the motor will generate accumulated errors. [0003] For the pulse generation method, there is currently a direct frequency division method, which is to directly divide the frequency by the quotient of the system clock and the expected target...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
Inventor 陈安胡跃明闵思思
Owner SOUTH CHINA UNIV OF TECH
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