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Old 4th March 2008, 01:54 PM   #1
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Default Improved class BD

Class BD is known for 3 state, high-low-0. the well known patent is #6,097,249 from Rockford
I found this : http://www.google.com/patents?id=7nW...+zeff+class+BD
It seems an improvement over Rockford's patent. Is it Robert Zeff of Zapco?
How can Fredos make classBD only with 2 output mosfets? http://www.diyaudio.com/forums/showt...729#post904729
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Old 7th March 2008, 12:24 AM   #2
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Old class BD patent#3585517
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Old 7th March 2008, 12:50 AM   #3
fredos is offline fredos  Canada
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Good patent...It's easy to do with some logic gate...Cue: 2 out of phase triangle wave, on phase audio, 1 output coil with basic half bridge....

Fredos
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Old 9th March 2008, 11:37 AM   #4
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Hi, Fredos,

Logic, is it like Robert Zeff application above (NOR gate), or like patent #6316964 or #6288605 or #5210449?
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Old 9th March 2008, 03:38 PM   #5
fredos is offline fredos  Canada
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Bit different...Triangle are in phase and audio out of phase in these patents...I use in phase audio with out of phase triangle, with some cmos logic to achieve bd modulation...
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Old 23rd March 2008, 01:13 PM   #6
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If the definition of classBD is 3 state, this patent is interesting #7,218,173
I don't understand it. What is the function of Cramp and Rramp?
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Old 28th May 2010, 03:58 PM   #7
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Quote:
Originally Posted by fredos View Post
Bit different...Triangle are in phase and audio out of phase in these patents...I use in phase audio with out of phase triangle, with some cmos logic to achieve bd modulation...
In this way the audio output signal might suffer cross-over like distortion
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Old 9th April 2012, 11:07 PM   #8
JZatopa is offline JZatopa  United States
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Could someone tell me if this is valid enough to be considered a real new amplifier class or if it is just an extension of class D technology.
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Old 10th April 2012, 05:21 AM   #9
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Its just another mode of operation in Class-D amplifiers.
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