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Talk:Pulse-width modulation

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See also, Error Diffusion?

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)[reply]

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)[reply]

PWM Controllers

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)[reply]

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)

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)[reply]

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)[reply]

In my experience, a square wave is specifically a pulse with a 50% duty cycle; if you adjust the ratio of the time axis to the amplitude axis in a display or diagram, you can make each half cycle a square. I changed "square" to "pulse" throughout, because duty cycle varies. "Square" does not refer to the shape of the corners of the waveform! Including "rectangular" would be a good idea, but doing so increases verbal clutter. Perhaps my strong feeling is partially influenced by spending years with analog music synthesizers, in which a square wave definitely has a 50% dufy cycle. (You might want to remove the bit about setting 50% duty cycle by ear.) Regards, Nikevich (talk) 09:30, 26 July 2009 (UTC)[reply]


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)[reply]


This needs an mp3 sample

What's the point of learning about synths if you can't hear it? —Preceding unsigned comment added by 75.57.186.23 (talk) 20:41, 27 November 2008 (UTC)[reply]

Servos?

Almost all the servos I've seen are controlled by a PWM signal. Why is it, then, that this article doesn't even mention the word "servo" once? Salvar (talk) 14:01, 6 June 2009 (UTC)[reply]

Power Delivery

Should the line: "In this case the PWM duty cycle is defined by the frequency of the AC line voltage (50 Hz or 60 Hz depending on the country)" actually refer to period rather than duty cycle? —Preceding unsigned comment added by 134.225.210.40 (talk) 14:17, 3 July 2009 (UTC)[reply]

Class D amplifiers used in cell. phones?

I strongly suspect that PWM amplifiers are used for the earphone/speaker in a cell. phone, to economize on battery power. However, I'm not sure, so I didn't add such a comment. Nevertheless, if true (likely), this must be the most commonplace application of PWM technology.

Regards, Nikevich (talk) 09:38, 26 July 2009 (UTC)[reply]

Lamp dimmers at 2x power line frequency

They work on both half-cycles, unless I'm quite-badly misinformed. (Fairly sure a typical triac dimmer switches on at a variable point, and switches off when the load current comes close to zero.)

Regards, Nikevich (talk) 09:38, 26 July 2009 (UTC)[reply]

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