Talk:Pulse-width modulation
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See also, Error Diffusion?
The illustration that is currently shown in this article is erroneous and misleading, IMO. What is shown there appears to be a very rough stepwise approximation of a sinewave with very low resolution - this is definitely very different from a PWM signal, which would be a square wave with a duty cycle varying as the sine of the angle. When filtered, the original sinewave is recovered. If the filtering is deliberately made inadequate so that there is a residual PWM signal (for illustration purposes, say), it still wouldn't look like the image presented here. I think someone has got their wires crossed, and in adding this image here, will cross others' wires too! I will remove the image, and suggest a more appropriate one is provided. Graham 09:21, 1 January 2006 (UTC)
- I made an image that might be closer to what you're looking to.CyrilB 09:43, 24 March 2006 (UTC)
- I agree that the first image is misleading. Should it really be the FIRST image on the page? --TedPavlic | talk 18:35, 18 February 2008 (UTC)
- I agree too. Misleading is too kind. The voltage is being modulated too. PWM is just the varying length of time on v/s the length of time off over a fixed period. —Preceding unsigned comment added by 209.134.164.113 (talk) 17:30, 30 May 2008 (UTC)
I have the impression that this article is somewhat messy. applications, methods and principle are mixed together. Maybe we could organize this : principle (make the average value of a rectangular signal vary by modifying its duty cycle), applications (I'm a power electronics guy, so I only know applications in this field), methods to generate the pwm (like in the figure I added, but there are other)
What do you think?CyrilB 09:43, 24 March 2006 (UTC)
I was looking for an information I have not get. Is the PWM used for both AC-DC converter and DC-AC inverter or just the latter one? I know it is not the proper place to ask this kind of questions. But it should be intereting that this article describe this point in the future.
-- -M-ric 02:44, 7 May 2006 (UTC)
Contents |
[edit] PWM Controlers
This article needs to be extended especially voltage regulation section. PWM controller can be used in AC-DC as well as DC-DC conversion.I'll add some text in the voltage regulation and u can get some idea Kundojjala 17:32, 24 May 2006 (UTC)
[edit] Distributed PWM
Should we include distributed pulse width modulation, in which the pulse is broken up into a series of small pulses? This might not fall under pulse density modulation since a known duty cycle is output. Furthermore, there is no sigma-delta modulation going on. 128.151.161.49Iain (imarcuso@mail.rochester.edu)
[edit] Natural and Uniform Sampling?
There is no mention of natural and uniform sampling. A complete discussion of PWM would include these two different methods of implementing PWM (and information, perhaps, about the frequency-domain consequences). --TedPavlic | talk 18:35, 18 February 2008 (UTC)
[edit] Pulse Width Modulation vs Duty Cycle Modulation
The introductory statement is misleading: "Pulse-width modulation uses a square wave whose duty cycle is modulated". If you modulate the duty cycle (ie. freedom to move both the positive and negative edges, only ensuring that the ratio pulse width to pulse period matches the modulated signal) then you have duty cycle modulation. Pulse width modulation fixes one of the edges so you have a fixed period, and varies only the pulse width. The correct statement should be "Pulse-width modulation uses a square wave whose pulse width is modulated", but my change keeps getting reverted... —Preceding unsigned comment added by 129.215.215.162 (talk) 15:20, 1 April 2008 (UTC)
- Try to use edit summaries, and mention that you'll be adding your reasoning to the talk page. As far as I could see, you were removing valuable context from the article with no clear explaination. Yngvarr (c) 15:22, 1 April 2008 (UTC)
