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Class D Switching Power Amplifiers and Power D/A conversion

Using Class D for tracking power supply?
Using Class D for tracking power supply?
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Old 23rd June 2018, 03:11 AM   #31
hellokitty123 is offline hellokitty123  United States
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I need something that does not cause a delay between the input and the output. Can this be practically done in class D?
 
Old 23rd June 2018, 03:27 AM   #32
rayma is offline rayma  United States
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Even light takes nanoseconds, can you describe your application?
 
Old 23rd June 2018, 03:45 AM   #33
hellokitty123 is offline hellokitty123  United States
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Other than trying to get class A sound out of it by wrapping it inside of the feedback loop of something else I also want to build a class D tracking power supply to reduce the power dissipation of class A circuits.
 
Old 23rd June 2018, 02:49 PM   #35
hellokitty123 is offline hellokitty123  United States
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Those systems rely upon putting a delay on the main amplifier signal to compensate for the class D delay. I want to do the opposite.
Can you answer my previous question as it pertains to my purposes?
 
Old 23rd June 2018, 04:05 PM   #36
rayma is offline rayma  United States
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I would see what has previously been done. It's likely that you would want a fast rise and a slow decay.
 
Old 23rd June 2018, 04:31 PM   #37
hellokitty123 is offline hellokitty123  United States
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Self oscillating class D designs don't have a delay right?
 
Old 23rd June 2018, 04:38 PM   #38
rayma is offline rayma  United States
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They use the output filter as part of the design, so that is an advantage. This is one commercial approach.
(PDF) Simple Self-Oscillating Class D Amplifier with Full Output Filter Control
 
Old 23rd June 2018, 08:32 PM   #39
Antoinel is offline Antoinel  United States
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Using Class D for tracking power supply?
hellokitty123. I'll gladly post a concept schematic to continue this conversation.

Best
Anton
 
Old 24th June 2018, 08:54 AM   #40
basreflex is offline basreflex  Spain
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the supply tracking using classD is the concept of the labgruppen amps, like the FP14000.
you may find some schematics on the web
 

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