File:Pwm.svg

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Description
English: Principle of the intersective pulse width modulation (PWM). Created with maxima.
Русский: Принцип перекрёстной широтно-импульсной модуляции
Date
Source Own work based on: Pwm.png by CyrilB
Author  
Vector:
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Source Code
sawtooth(t) := t - floor(t);
freq : 0.05$
sinesignal(t) := (1/2)+(499/1000)*sin(2*%pi*freq*t);
pwm(t) := if(sawtooth(t) >= sinesignal(t)) then 0 else 1;
load(draw)$
n : 1e4;kill(crossing);
crossing : (x:[0],
    for i:0 while i<20*n do
        if( pwm(i/n)#pwm((i+1)/n) )       /* detect edge */
            then x:append(x,[(i/n)]),
    setify(x));
length(crossing);  /* copy the x-tics from here */
source : gr2d(
    font="Times",nticks=50,
    grid=true,ytics={0,1},yrange=[-.25,1.25],
    user_preamble="set format x "";set xlabel "" 0,1;
        set bmargin 0;set tmargin 0",
    xtics= {0,0.592,0.999,1.762,1.999,2.893,2.999,3.973,
3.999,4.998,4.999,5.975,5.999,6.911,6.999,7.816,7.999,
8.698,9,9.567,10,10.432,
10.999,11.301,11.999,12.183,12.999,13.088,13.999,14.024,
14.999,15.001,15.999,16.026,16.999,17.106,17.999,18.237,
18.999,19.407,19.999},
    xlabel="",ylabel="source signals",
    explicit(sawtooth(x),x,0,19),
    color=red,explicit(sinesignal(x),x,0,19)
)$
pwm_plot : gr2d(
    font="Times",nticks=50,
    grid=true,ytics={0,1},yrange=[-.25,1.25],
    user_preamble="set format x "";set bmargin 2.25",
    xtics= {0,0.592,0.999,1.762,1.999,2.893,2.999,3.973,
3.999,4.998,4.999,5.975,5.999,6.911,6.999,7.816,7.999,
8.698,9,9.567,10,10.432,
10.999,11.301,11.999,12.183,12.999,13.088,13.999,14.024,
14.999,15.001,15.999,16.026,16.999,17.106,17.999,18.237,
18.999,19.407,19.999},
    xlabel="Time",ylabel="PWM signal",
    color=magenta,explicit(pwm(x),x,0,19)
)$
draw(terminal=svg,file_name="Pwm",
    source,pwm_plot);


I, the copyright holder of this work, hereby publish it under the following licenses:
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You are free:
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Under the following conditions:
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w:en:Creative Commons
attribution share alike 		This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
  • share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
This licensing tag was added to this file as part of the GFDL licensing update.
GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.
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This image is a derivative work of the following images:

  • Pwm.png licensed with Cc-by-sa-2.5,2.0,1.0, Cc-by-sa-3.0-migrated, GFDL
    • 2006-03-23T08:44:47Z CyrilB 1500x1050 (87343 Bytes) Cyril BUTTAY Principle of the intersective pulse width modulation (PWM). This figure has been made using gnuplot 4.0 and the following code: # This file is used to generate a plot that explains the # principle of the inte

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Date/TimeThumbnailDimensionsUserComment
current00:44, 29 May 2011Thumbnail for version as of 00:44, 29 May 2011600 × 500 (71 KB)Krishnavedala (talk | contribs){{Information |Description=Principle of the intersective pulse width modulation (PWM). Created with following maxima code. <source lang="gnuplot"> sawtooth(t) := t - floor(t); freq : 0.05$ sinesignal(t) := (1/2)+(499/1000)*sin(2*%pi

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