Which 12V DC SMPS for amps? - diyAudio
Go Back   Home > Forums > Amplifiers > Class D

Class D Switching Power Amplifiers and Power D/A conversion

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 7th February 2008, 02:17 PM   #1
tfboy is offline tfboy  United Kingdom
diyAudio Member
 
Join Date: Feb 2006
Location: Reading, Berkshire
Question Which 12V DC SMPS for amps?

Hi there. Long time reader, first time poster, so please be gentle with me!

I'm working on a new build for my car. I currently have a few car audio amps driving the equipment, however, I think I need a change!

The reason I'm changing all this is because I'm planning on driving my speakers actively, ditching the crossovers they came with; I'll be using something like a Pioneer DEX-P9 and DEQ-P9 to do all the filtering and crossovers. I just don't have enough space in the car boot to put normal car audio amps and so I'm looking at going down the Class D route to save space yet get decent quality power.

My current thought it to have the following:
  • 2x Hypex UcD180 for each main woofer driver
  • 2x Hypex UcD180 for each tweeter
  • 1x Hypex UcD400 to drive a subwoofer.
I sent an email off to Hypex asking about PSU possibilities because obviously being used in a vehicle, I only have a 12 - 14.4V DC supply and no 230V AC.

They recommended I have a look at coldamp's CPS80 and I think I would possibly need two of those units to comfortably drive the above UcD amps. Although getting two ends up being rather pricey

Can you advise what you think on the above? Are there 12VDC - +-40V DC ready-built kits other than the CPS80 available? Ideally, if there was something with more power, then I could have just one. Or is one CPS80 enough for the above? I'm an electronics engineer and pretty handy with soldering and all that, but my electronic design skills are abandoning me so I can't see myself building something from scratch and making up my own windings for transformers, etc.

Recommendations gratefully received

P.S I posted this in the Class D section and not the car audio as I thought it pertained more to class D and powering it than car audio specifically. Please move if you think it would be better in the other section
  Reply With Quote
Old 7th February 2008, 06:35 PM   #2
wapajk is offline wapajk  Croatia
diyAudio Member
 
Join Date: Feb 2008
you could try Rod Eliot design, he alo provide great deal of info. It is DIY.

With little modifications(using larger core,adding more mosfets in parallel, and increasing turn ratio) it can deliver much more power, and higher voltages.

Just a thought!!

http://sound.westhost.com/project89.htm
  Reply With Quote
Old 8th February 2008, 01:03 AM   #3
tfboy is offline tfboy  United Kingdom
diyAudio Member
 
Join Date: Feb 2006
Location: Reading, Berkshire
Hi Wapajk.

Thanks for the link. I did come across it doing some reading, but it sounds a bit too involved for me right now, plus I'd have to work out things and that could be dangerous
  Reply With Quote
Old 8th February 2008, 02:26 AM   #4
y8s is offline y8s  United States
diyAudio Member
 
y8s's Avatar
 
Join Date: May 2006
Send a message via AIM to y8s Send a message via MSN to y8s Send a message via Yahoo to y8s
I just read the ESP page today. it doesn't look too complex, just the transformer may be a challenge. might not be a bad project if you have a current limited way to test it first.
  Reply With Quote
Old 8th February 2008, 03:03 AM   #5
diyAudio Member
 
MikeHunt79's Avatar
 
Join Date: Aug 2003
Location: Bristol, UK
take a look at the thread in this section called "Big-t"
  Reply With Quote
Old 8th February 2008, 08:19 AM   #6
luka is offline luka  Slovenia
diyAudio Member
 
luka's Avatar
 
Join Date: Sep 2005
Location: in Slovenia :)
Send a message via Skype™ to luka
Hi

Winding toroids is not that hard, you only have to spread all and each winding around core, not just say one primary on 1/2 of core and other on other 1/2, both must be on all... same for all others

+ if you would go under Car Audio -> Favorite Threads and Posts in "Car Audio", where this thread should be, you would find one allready made design. I made few of them last one yesterday and I got 280w like nobody's business... now I will add snubbers just to get rid of that small 2.8Mhz ringing that is present
__________________
home page @ http://www.classdaudio.tk/ @ 24/7 all year long
I FEEL SLOVENIA
  Reply With Quote
Old 8th February 2008, 02:11 PM   #7
tfboy is offline tfboy  United Kingdom
diyAudio Member
 
Join Date: Feb 2006
Location: Reading, Berkshire
Thanks for the encouragement, chaps

The only major issue I see is that I'd be looking for around 800W to 1kW available to the amps, and I admit that's quite a lot to have for a home-built design. Of course, I could build multiple power supplies to spread the load, but then I'm probably going to have the space limitations hit me once more.

Unless there's an easy design that can provide similar power to the CPS80 from coldamp, I might as well go with Coldamp's design. Sure, it's expensive, but it's a tried and tested solution
  Reply With Quote
Old 10th February 2008, 11:16 AM   #8
kck87 is offline kck87  Turkey
diyAudio Member
 
Join Date: Feb 2008
original schema

Click the image to open in full size.


modify schema

Click the image to open in full size.

pcb 1000W

Click the image to open in full size.

1000W pcb proteus files

http://rapidshare.com/files/90637460/1000W.LYT.html
  Reply With Quote
Old 10th February 2008, 04:00 PM   #9
TheMG is offline TheMG  Canada
diyAudio Member
 
Join Date: Jan 2008
Quote:
Originally posted by tfboy
The only major issue I see is that I'd be looking for around 800W to 1kW available to the amps, and I admit that's quite a lot to have for a home-built design.
Even though all those UCDs are totaling a max output power of 760W RMS, which after the 90% efficiency is factored in is ~844W power drawn, you will most likely never actually be pumping out that much power. Unless you're planning on going crazy with pumping pure sines through your speakers at full volume, you're not going to need that much power.

Plus, you'd have to be running the modules at their full +/- 65V for the UCD400 and +/- 45V for the UCD180, which are the voltages Hypex used to obtain their output power ratings. Which brings me to another point, you'll want to have two power supplies if you wish to get the most out of the modules, for the reason stated above (diff voltages).
  Reply With Quote
Old 10th February 2008, 06:06 PM   #10
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
Why not just get the appropriate chip from Texas Instruments? they have the H-Bridge "in situ" so you don't have to waste time building a switch mode power supply.
  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
Anyone making SMPS for power amps? mr.duck Parts 15 17th April 2007 11:32 AM
SMPS for class A amps? folkeb Power Supplies 2 24th March 2007 12:53 PM
SMPS for diy audio amps and multi-channel diy amps (and their power supplies) tlparker Solid State 18 31st August 2006 10:39 AM
SMPS design for power amps (Class D in particular) Bruno Putzeys Class D 138 17th November 2004 04:24 PM
SMPS for chip amps francis Chip Amps 14 1st July 2004 07:17 AM


New To Site? Need Help?

All times are GMT. The time now is 07:32 AM.


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