Power supply cap multiplier with electronic protection - Page 2 - diyAudio
Go Back   Home > Forums > Amplifiers > Power Supplies

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 16th April 2012, 04:05 PM   #11
dadod is offline dadod  Croatia
diyAudio Member
 
dadod's Avatar
 
Join Date: Apr 2006
Location: Zagreb
Quote:
Originally Posted by sawreyrw View Post
I don't think the overload and short circuit will be fast enough to protect the supply. Also, I doubt the pass transistors can handle 10 amps without overheating. I could be wrong; have you done a worst case thermal analysis? I don't see any voltage reference in the schematic. How do you think this will regulate if the input line voltage changes?
Here is simulation at cca 10 A of the load current. There is about 5 V of the voltage drop on the regulation transistor and with 10 A it gives 50 W. Look here for SOA http://www.onsemi.com/pub_link/Colla...MJL4281A-D.PDF
This is not a stabilizator but regulator or some kind of a capacitor multiplier. It will follow slow input voltage changes, but regulate a fast ones.
dado
Attached Images
File Type: jpg PS regulatorBJT 10A.jpg (177.3 KB, 467 views)
  Reply With Quote
Old 30th April 2012, 09:09 PM   #12
dadod is offline dadod  Croatia
diyAudio Member
 
dadod's Avatar
 
Join Date: Apr 2006
Location: Zagreb
Quote:
Originally Posted by dadod View Post
LineSource, did you do any simulation, what do you think of the regulator??
This regulator (BJT type) is used in my TT amp and works as intended.
dado
LineSource, I was expecting to get some information from you but nothing, it's not nice that. Have you done your simulation and what is your opinion?
dado
  Reply With Quote
Old 20th October 2012, 02:20 AM   #13
diyAudio Member
 
Join Date: Feb 2005
Location: Melbourne
dadod, just saw your thread linked from other one - late, as usual!

What does all the circuitry around Q6,7,8 &9 actually do, including the zeners D7,8,9 on the +ve rail (similar to -ve rail) - if this can be either simplifier/left off, it's a much simpler cct and I might try it out.

... james
__________________
... jh
  Reply With Quote
Old 20th October 2012, 03:10 PM   #14
dadod is offline dadod  Croatia
diyAudio Member
 
dadod's Avatar
 
Join Date: Apr 2006
Location: Zagreb
Quote:
Originally Posted by jameshillj View Post
dadod, just saw your thread linked from other one - late, as usual!

What does all the circuitry around Q6,7,8 &9 actually do, including the zeners D7,8,9 on the +ve rail (similar to -ve rail) - if this can be either simplifier/left off, it's a much simpler cct and I might try it out.

... james
Q7 and Q8 act as “thyristor” circuit, they are normally off, but if an input voltage is applied to Q8, even briefly, it will conduct and feed current into the base of Q7. This will make Q1 conduct, which in turn, will feed current into Q2, which holds the circuit on, or latched.
Q9 is the loudspeaker protection sensing element, and the zeners define that what difference in supply lines are acceptable, in this case if differente is more then 20 V it will trigger protection and cat the power. This will happen if one of the supplies is cut off, and it will then turn the other line off as well.
dado
  Reply With Quote
Old 20th October 2012, 05:54 PM   #15
dadod is offline dadod  Croatia
diyAudio Member
 
dadod's Avatar
 
Join Date: Apr 2006
Location: Zagreb
Last PCB layout is here. ThermalTrak+TMC amp
  Reply With Quote
Old 6th June 2013, 06:02 PM   #16
diyAudio Member
 
Join Date: Dec 2010
Quote:
Originally Posted by dadod View Post
Q7 and Q8 act as “thyristor” circuit...
Also does the Naim supply regulator.
  Reply With Quote
Old 13th September 2013, 10:45 AM   #17
dadod is offline dadod  Croatia
diyAudio Member
 
dadod's Avatar
 
Join Date: Apr 2006
Location: Zagreb
Quote:
Originally Posted by franzm View Post
Also does the Naim supply regulator.
Thanks for information, I didn't know that
  Reply With Quote
Old 26th April 2014, 12:42 PM   #18
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Is post1 schematic the current version, or is it superseded by post 15?
__________________
regards Andrew T.
  Reply With Quote
Old 26th April 2014, 08:57 PM   #19
dadod is offline dadod  Croatia
diyAudio Member
 
dadod's Avatar
 
Join Date: Apr 2006
Location: Zagreb
Quote:
Originally Posted by AndrewT View Post
Is post1 schematic the current version, or is it superseded by post 15?
Actually I made an improved version and I use it now with my TT amp. If you are interested I can show it in my TT amp tread with new layout.
  Reply With Quote
Old 6th July 2014, 05:08 PM   #20
mcd99uk is offline mcd99uk  United Kingdom
diyAudio Member
 
Join Date: Mar 2008
Location: UK
Hi Damir,

This is a nice solution to a problem I have been trying to solve with my latest amplifier. Could do with higher voltage rails but I suspect this can be easily achieved.

Do you have a latest version or is the version in your TT amp thread the final solution?

Paul
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
why this class D power supply no high voltage side electronic cap? greenamp Class D 10 29th January 2012 06:32 PM
Voltage multiplier vs transformer for preamp HV power supply frickecello Tubes / Valves 1 24th February 2011 12:24 AM
Problem with capacitance multiplier power supply jscherer Parts 15 22nd March 2009 03:08 PM
Capacitance Multiplier Power Supply Redshift187 Chip Amps 5 15th January 2009 01:34 PM
Cap. multiplier or regulated supply ? Buhl Pass Labs 1 8th October 2003 11:51 PM


New To Site? Need Help?

All times are GMT. The time now is 08:28 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2