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Old 23rd January 2006, 09:20 AM   #221
forr is offline forr  France
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As series regulator plus a shunt regulator make something quite near to a push-pull class A stage with different currents in the limbs. Right ?

~~~~~~~ Forr

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Old 23rd January 2006, 09:49 AM   #222
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Quote:
Originally posted by forr
As series regulator plus a shunt regulator make something quite near to a push-pull class A stage with different currents in the limbs. Right ?

~~~~~~~ Forr

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Push-pull from one supply rail???
Hey look at me!
 
Old 23rd January 2006, 06:06 PM   #223
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Forr, I agree with you. It is an active 'pull-down' of an error signal. We sometimes see something like this in motor drive servos, when we want to stop the motor quickly.
 
Old 23rd January 2006, 07:16 PM   #224
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Hello,

I present you, for opinions and critics, a simplified schematic only of the positive rail, of my project of power supply.

I tried to take into account your observations with regard to the precedent schematic appeared in the post #191.

Darry
Attached Files
File Type: pdf psu-1.pdf (18.1 KB, 1370 views)
 
Old 24th January 2006, 12:22 AM   #225
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Hi, John Curl, Elso Kwak,

Push-pull regulation :
this has been done with power IC's with a zener at the input. If the output is not at the middle of the IC power supply, one limb only is delivering current.
If a push-pull supply regulator is working in class A, it should be faster and have a lower impedance than either a series or a shunt regulator.
I thought of it rather as an academic speculation than for a practical implementation.

~~~~~ Forr

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Old 24th January 2006, 12:44 AM   #226
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I agree, it is mostly academic, BUT the shunt regulator still can be very valuable because it can be much faster responding than the input series regulator, AND it can give a constant current load to the input series supply at all times. Not a bad thing at all.
 
Old 24th January 2006, 01:25 AM   #227
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I like shunt regulators, efficiency is not concern in preamps
 
Old 24th January 2006, 09:10 PM   #228
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Another idea on PSU, I throw it like this, I have not much time at the moment to go further, simulation… real tests… etc. And maybe some errors and mistakes, if someone have time…

PSU_Study_2

More comments on the thread tomorrow. Too tired now
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Old 24th January 2006, 09:56 PM   #229
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Yes, it is objective values, John... but have you some objective listening comparisions between both solutions ? Pros and cons of both ?
 
Old 24th January 2006, 11:29 PM   #230
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Wow, Richard! You are 'crazier' than I am. What a schematic!
 

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