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 31st May 2010, 09:05 AM   #1
diyAudio Member
 
Join Date: Apr 2009
Default SMPS design for a car amp....not sure which topology to go with

So I've got this crazy idea to build a car amp using 2x TDA8950 and 2x TDA8920 or simply 4x TDA8950 on connexelectronics boards.

2 of the TDA 8950s run the midbasses, the other two amps would run the mid/tweeters, so their power outputs would be modest, maybe 20-25W/ch at most in practice. 6dB or so of headroom on the mids and tweeters is a bit overkill but I like it!

So with that in mind, total system power would not be 800W RMS in practice, but probably more like 500W.

I was thinking a push pull topology driving a center tapped transformer but my friend wants a SEPIC converter for the V+ rail and a Ćuk converter (basically an inverting SEPIC) converter for the V- rail.

I like the transformer idea because I get both rails from one SMPS and I have a good concept of how it works. My friend says his way gives greater efficiency with the benefit that only inductors are needed, which are easier to get preassembled.

So which way is preferred? It seems like everyone uses the push pull converter....is there some reason for this or is my friend on to something with his dual converter design?
  Reply With Quote
Old 31st May 2010, 10:30 AM   #2
Did it Himself
diyAudio Member
 
richie00boy's Avatar
 
Join Date: Nov 2003
Location: Gloucestershire, England, UK
Push-pull for the simple reason that it gives you galvanic isolation from ground. In a car if you use your friends method you are likely to run into ground loops - alternator whine, pops and clicks etc.
__________________
www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more.
  Reply With Quote
Old 31st May 2010, 11:02 AM   #3
Cristi is offline Cristi  Europe
diyAudio Member
 
Join Date: Dec 2008
Location: Dortmund+Shenzhen
Default Smps12-500

Well, if you will have just little patience, and wait for about one week, you might use one of these, along with the TDA89x0 amplifier modules. here is a picture of a first version, made last year, for an OEM Customer, it is capable to deliver 300W continuous and up to 500W peak with output voltages of +-2x Vin, +-3xVin and +-4xVin. it has high efficiency and very low size. undervoltage, overvoltage, overcurrent, overtemperature protections as well. the first version was 150mm long, 50mm wide and 13mm tall, at the capacitors side 22mm tall. the next version will be commercial, and is 120mm long, 50mm wide, and just 13mm tall. i will post some pictures in the following days.
Attached Images
File Type: jpg SMPS12-500.JPG (68.0 KB, 254 views)
__________________
www.connexelectronic.com complete assembled amplifier and SMPS
  Reply With Quote
Old 31st May 2010, 05:36 PM   #4
diyAudio Member
 
Join Date: Apr 2009
That SMPS looks amazing!
  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
toroid for car amp smps sss Car Audio 253 8th November 2012 05:06 PM
SMPS for car amp dannycelluk Car Audio 3 12th March 2010 07:59 PM
Car poweramp SMPS repair TL594CN based design, help! Puggie Power Supplies 3 2nd August 2006 08:21 PM
no smps car amp? How about a aleph X JZatopa Car Audio 4 29th November 2005 05:32 PM


New To Site? Need Help?

All times are GMT. The time now is 04:13 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