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-   -   Hysteresis Controller with constant switching frequency (http://www.diyaudio.com/forums/class-d/81667-hysteresis-controller-constant-switching-frequency.html)

TOINO 17th June 2006 05:04 PM

Hysteresis Controller with constant switching frequency
 
This paper seems to be interesting:

http://www.elkraft.ntnu.no/norpie/10...Papers/029.pdf

classd4sure 18th June 2006 08:37 AM

It was interesting the first time we'd seen it, and the second. Look for a thread by analogspiceman on this.

TOINO 18th June 2006 11:48 AM

You mean this one ?

http://www.diyaudio.com/forums/showt...948#post793948


Well... at least everybody could read it now… not only you and Analog with your secret mail exchanges :clown:

classd4sure 18th June 2006 11:50 AM

Good job hunting that down :) That's exactly the thread I had in mind.

TOINO 18th June 2006 08:34 PM

http://www.diyaudio.com/forums/showt...688#post793688

Wau! What a tread!

In http://www.diyaudio.com/forums/showt...328#post811328
Analogspiceman complains because has no inductor sense winding but this info is cleary visible on
the page 3 sch of the posted document.
Also on the picture of page 4 is easy to count the turns ratio 20:1.

As far as I understand, every body searches for a constant frequency solution…

What about the use of a PLL control referenced to a crystal oscillator?

One could control the reference of the comparator with the PLL and force a "constant" frequency! :whip:


Some thing like this: http://www.freepatentsonline.com/5160896.pdf
but with PLL instead of multiplier


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