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Old 14th April 2008, 10:29 AM   #1
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Default Overload and Short Circuit Protection

hi, how to make Overload and Short Circuit Protection for amp?

thank you.
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Old 14th April 2008, 11:13 AM   #2
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Check this paper! (See attachement!)
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File Type: pdf amp_prot.pdf (90.0 KB, 525 views)
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Old 14th April 2008, 12:08 PM   #3
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Andy L. Francis, good article!

I prefer not use emitter resistors, if possible. In this time I place collector resistors and sensor with SOA approximation. After follows trigger on two transistors and switch, which shutdowns driver.
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Old 1st May 2008, 01:58 PM   #4
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Anyone has more design notes for OP protection circuits?
I'm interested. Thanks.
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Old 23rd February 2009, 02:20 PM   #5
Billys8 is offline Billys8  Greece
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Anybody?
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Old 23rd February 2009, 02:50 PM   #6
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This is sample of SOA protection. This variant don't affect on sound of amplifier
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File Type: png soa protection.png (31.7 KB, 631 views)
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Old 23rd February 2009, 04:53 PM   #7
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I'd be interested in getting any information possible on protection circuits (short-circuit protection & over-current protection) for QUASI output stage. Thanks.
__________________
Sam
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Old 24th February 2009, 09:51 AM   #8
Billys8 is offline Billys8  Greece
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Kostya-M, how can we use this? Can you help us describe us how it works?

Thank you in advance.
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Old 24th February 2009, 11:32 AM   #9
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If current throw output transistor (VT15/16) is high, voltage on sense resistor 0.1 Ohm opens transistor VT18 or VT22. Circuit with resistors 50-59 and zenners varies open current as to limit power dissipation on output transistors. VT19-21 - trigger. It opens VT17 and VT23. Its must switch off driverís cascade.
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Old 28th February 2009, 08:36 AM   #10
Billys8 is offline Billys8  Greece
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Kostya-M, thank you for your answer.

I cannot understand how it works. I am confused about how it will sense the overload and how i will set it for specific transistors.
I guess that this is a sample, as you wrote, do you have a schematic more specific?
I think that this could be help me more.

Thank you.
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