Now you can both see and hear the pulse width modulation in a PWM solar charge controller.

By Julian

Youtuber, shed dweller, solar charge controller aficionado

5 thoughts on “Pulse width modulation – watching and listening”
  1. Avataaar/Circle Created with python_avatars Frank Lopez says:

    Sound & electricity "sounds to be the same" is this how harmonic sound frequency is generated? Essentially I wud think that pwm sound can generate the hertz necessary to power or move a DC or servo motor…. And if thru I wud assume that if you can have an electric piano synthesize and music note that of the same sound frequency as a say 50hz you chud be able to have a connection solder to motor and play a musical note at that that powers a Hertz similar to a pwm sound to move a gear head to the next teeth or spoke? Kinda like a telegraph machine or telephone knows what digits your pressing or dial tone or kinda like a fax know what your faxing and prints it or like a 3D printer moves and you hear those traveling sounds, if all this theory of mines is correct I guess I can make a bunch of motors move to a specific location by just saying it or playing a musical note, I been working on a project where I use sounds to generate power in a analog mode

  2. Avataaar/Circle Created with python_avatars KX36 says:

    sunshine in uk? I call FAAKE!!!!! 😉

    Seriously though, why are those devices so slow to stabilise the duty cycle? is it a feature of solar charging equipment? something to do with MPPT? It's certainly not a feature of normal DC-DC converters which would stabilise in microseconds. Also don't see why digital vs analog control loop would affect this.

  3. Avataaar/Circle Created with python_avatars erlendse says:

    Is there any inductor in the setup?

    So much focus on PWM, but no mention of buck/boost as I would expect.

    Not even talk about synchronous buck-converter, that I would expect if you are really serious about efficiency. I did buy some synchronous buck-converter chips for use as battery-charger. In my case non-solar setup, but they would be ideal for solar battery charge and generic voltage/current control. (you can get them with MPPT function too, or use some microcontroller to guide it)

  4. Avataaar/Circle Created with python_avatars Serhii Trush says:

    I love Your British accent

  5. Avataaar/Circle Created with python_avatars DJ Scottdog says:

    very interesting, im doing electrical eng at college 

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