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Old 12th May 2013, 12:09 PM   #1
Bonsai is offline Bonsai  Taiwan
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Default Michael Kiwanuka's SOA PAper

Michael's SOA paper can be down loaded here

SOA Protection for Audio Power Amplifiers

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Old 12th May 2013, 01:20 PM   #2
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Thanks Bonsai.
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Old 12th May 2013, 01:38 PM   #3
wahab is offline wahab  Algeria
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How to do a lot with few , i mean , quite an exaustive study
of output stage protection circuitry , the most complete i ve seen so far,
congrats , mike , for this usefull paper.
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Old 12th May 2013, 01:48 PM   #4
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Excellent! I think I have prodded Michael for at least the last 10 years to publish his work on SOA. A very worthwhile read!

jan
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Old 12th May 2013, 02:41 PM   #5
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Jan, fully concur!
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Old 12th May 2013, 02:41 PM   #6
Bonsai is offline Bonsai  Taiwan
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Originally Posted by michaelkiwanuka View Post
Thanks Bonsai.

My pleasure. Now get writing and publish!
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Old 13th May 2013, 05:16 PM   #7
Pingrs is offline Pingrs  United Kingdom
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My pleasure. Now get writing and publish!
Almost all that content was published in EW in Oct 2002. I've been using his VI limiter methodology in my Excel spreadsheets to build accurate protection ever since!

Brian.
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Old 14th May 2013, 04:13 PM   #8
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Very thank you, Bonsai!
It's very useful.
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Old 16th May 2013, 10:11 PM   #9
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Has anyone considered SOA protection in which the protection transistors are removed from the forward path of the amplifier and, instead, opto-coupled to a bistable which drops out the output relay?

The protection locus would have to be conservative as it would have to accomodate the fact that it may take up to ten milliseconds to drop out the relay.
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Old 17th May 2013, 12:09 AM   #10
Bonsai is offline Bonsai  Taiwan
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Use solid state relay. Fast (50-200 us), great repetitive current handling capability (100A no problem), and can handle inductive energy up to 500mJ.

Here is one example: Solid State Relay with PCB Layout

There are quite a few others on DIY audio as well.
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