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MOSFET switched rails
MOSFET switched rails
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Old 2nd January 2018, 07:26 AM   #1
synonymous is offline synonymous  United States
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Default MOSFET switched rails

My theory is that while switched rails can cause a DC fault detection and protection cycling issue when the power rails are disconnected and reconnected due to the detection itself being disconnected, that the addition of some resistors across the MOSFET switches will allow a small amount of DC current to pass in the case of device failure so that the detection system can keep the MOSFETS turned off. Also, my theory is that during power-up, the various sounds and anomalies at the output will be highly muted with a delay operation allowing the drive topology to settle.

Thoughts?

MOSFET-RAIL-SWITCH.png
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Old 4th January 2018, 04:51 PM   #2
synonymous is offline synonymous  United States
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MOSWITCHRAILJAN04.png
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Old 4th January 2018, 05:05 PM   #3
AndrewT is offline AndrewT  Scotland
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I see you using one U1 to control both P & N mosFETs.
Are you sure that will work?
Don't you need two off U1?
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Old 4th January 2018, 05:10 PM   #4
synonymous is offline synonymous  United States
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Quote:
Originally Posted by AndrewT View Post
I see you using one U1 to control both P & N mosFETs.
Are you sure that will work?
Don't you need two off U1?
Thanks Andy

Yes, however in the second post, I am showing a N-FET in each position.
Is this not possible? P-FET are slim pickings.
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Old 4th January 2018, 05:30 PM   #5
synonymous is offline synonymous  United States
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Yeah I think your'e right
Thanks for pointing that out
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Old 4th January 2018, 05:57 PM   #6
synonymous is offline synonymous  United States
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More like this...
Any idea for a good P-FET?

Thanks

P+N-SWITCH.png
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Old 4th January 2018, 11:37 PM   #7
synonymous is offline synonymous  United States
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Sorry for cluttering DIY, I like to eat but don't cook well.
Those previous schemes wont work
Resistors across the mosfet switches wont accomplish anything unless the load is disconnected, and some other values were askew. Aside of incorporating some discrete delay, this is what i'm looking ATM...

moswit.png
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