does anyone know new methods of modulation in class d audio amplifier

surZ90 · 18th February 2011, 05:05 AM

Hi all...
I'm new in class d audio amplifier...
I'm looking for a new modulation method in class d audio amplifier for my final project ...
does anyone can help me?

thanks

Th3 uN1Qu3 · 18th February 2011, 09:15 AM

Don't you think that if a new method was found, we would be out marketing it first instead of giving it for free?

Build something using one of the current methods first, get accustomed to it, break it in every way then fix it again. Learn how every part of the circuit operates. Then worry about "new".

nigelwright7557 · 18th February 2011, 10:54 PM

Quote:

Originally Posted by surZ90

Hi all...
I'm new in class d audio amplifier...
I'm looking for a new modulation method in class d audio amplifier for my final project ...
does anyone can help me?

thanks

The usual PWM method can also be adapted so it only outputs pulses when there is sound. When there is no sound there is no 50%/50% PWM output at all.
This makes for a very efficient class d. There was a video on youtube explaining it but I cant remember where it was.

nigelwright7557 · 18th February 2011, 10:58 PM

Found it !
He goes on to explain a filterless class d amp using a modified pulse system.

YouTube - An Overview of Class D Audio Amplifiers

Pafi · 19th February 2011, 12:48 AM

But it's not really new. If it were human, he could have childrens. Teenagers...

surZ90 · 22nd February 2011, 06:00 AM

I know some modulation methods such as self oscilating, PWM, delta sigma and sliding mode control. However, I do not really know the details, advantages and disadvantages for each method. Can anyone help me to give an idea about this?

Saturnus · 22nd February 2011, 06:15 AM

Isn't this the sort of things you're supposed to be reading up on when you're going to use it for a final project?

One thing you could look into is combining class D and class H.

fredos · 22nd February 2011, 02:29 PM

Phase shift modulation with a 4046. Use the XOR output to drive your output stage. Work well, but this technique lose control at clipping. The frequency shift go outside the gap band of the PLL.

Eva · 23rd February 2011, 05:42 PM

Single cycle control: A mix of feedforward and non-linear control, calculating duty cycle for each switching period with non-linear functions (like integrators) in such a way that all the errors are corrected as they appear instead of becoming cummulative (like in every triangle wave scheme). And doing that without getting a wide range of switching frequencies as a result.

18th February 2011, 05:05 AM	#1
surZ90 diyAudio Member Join Date: Feb 2011	does anyone know new methods of modulation in class d audio amplifier Hi all... I'm new in class d audio amplifier... I'm looking for a new modulation method in class d audio amplifier for my final project ... does anyone can help me? thanks

18th February 2011, 09:15 AM	#2
Th3 uN1Qu3 diyAudio Member Join Date: Feb 2010 Location: Bucharest	Don't you think that if a new method was found, we would be out marketing it first instead of giving it for free? Build something using one of the current methods first, get accustomed to it, break it in every way then fix it again. Learn how every part of the circuit operates. Then worry about "new". __________________ "Audio grade" components simply means that they failed at a more critical job.

18th February 2011, 10:58 PM	#4
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	Found it ! He goes on to explain a filterless class d amp using a modified pulse system. YouTube - An Overview of Class D Audio Amplifiers __________________ http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software.

23rd February 2011, 05:42 PM	#9
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	Single cycle control: A mix of feedforward and non-linear control, calculating duty cycle for each switching period with non-linear functions (like integrators) in such a way that all the errors are corrected as they appear instead of becoming cummulative (like in every triangle wave scheme). And doing that without getting a wide range of switching frequencies as a result. __________________ I use to feel like the small child in The Emperor's New Clothes tale

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19th February 2011, 12:48 AM	#5
Pafi diyAudio Member Join Date: May 2004 Location: Budapest	But it's not really new. If it were human, he could have childrens. Teenagers...

22nd February 2011, 06:00 AM	#6
surZ90 diyAudio Member Join Date: Feb 2011	I know some modulation methods such as self oscilating, PWM, delta sigma and sliding mode control. However, I do not really know the details, advantages and disadvantages for each method. Can anyone help me to give an idea about this?

22nd February 2011, 06:15 AM	#7
Saturnus diyAudio Member Join Date: Jun 2005 Location: Copenhagen, Denmark	Isn't this the sort of things you're supposed to be reading up on when you're going to use it for a final project? One thing you could look into is combining class D and class H.

22nd February 2011, 02:29 PM	#8
fredos diyAudio Member Join Date: Mar 2005 Location: Quebec	Phase shift modulation with a 4046. Use the XOR output to drive your output stage. Work well, but this technique lose control at clipping. The frequency shift go outside the gap band of the PLL.

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