Elliott Switchmode power supply PCB - diyAudio
Go Back   Home > Forums > General Interest > Car Audio

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 18th December 2004, 09:57 AM   #1
red is offline red  Romania
diyAudio Member
 
Join Date: Feb 2003
Location: Bucharest
Default Elliott Switchmode power supply PCB

Hy guys,
I want to build a smps using rod elliott schematic.
Since he doesn't makes pcb's for this project I tried and made one myself.So here it is...can anyone see anything wrong except the fact that I have 2 wires not connected?
Those 2 wil have coper wires on the mounting face of the pcb, but my real concern are the mosfet's.The pcb soldering side will have thicker wires than in the picture.My concern are the mosfet's.
So please I need some feedback
Attached Images
File Type: jpg ssmps.jpg (82.0 KB, 1998 views)
  Reply With Quote
Old 18th December 2004, 01:57 PM   #2
paulb is offline paulb  Canada
diyAudio Member
 
Join Date: Jun 2001
Location: Calgary
You should make the traces as thick as possible, especially in the high current areas around the MOSFETs. I assume this is double-sided? Some traces cross. You may want to try a single-sided with the other side all ground plane.
This looks like a tricky circuit to build. I assume you've got the right test equipment and some experience in this area. If not, try something simpler first.
  Reply With Quote
Old 18th December 2004, 02:17 PM   #3
red is offline red  Romania
diyAudio Member
 
Join Date: Feb 2003
Location: Bucharest
Ok some things to consider:

I will make it a one side pcb. I think youre sugestion with the other side to be grounded it's a very good one.

The traces That cross are actualy the same wire(Gnd in most of the cases). I have only two wires on the other side...one is gnd and one is 12v+ after filtering.

I will make everything as thick as I can (especialy the ones that are for the transformer and mosfets).The ground will be where it is possible even 2 or 3 cm thick.

And I may have the test equipment from my student lab, but I am not sure yet .
  Reply With Quote
Old 19th December 2004, 12:14 PM   #4
Tensop is offline Tensop  Lebanon
diyAudio Member
 
Join Date: Jul 2003
Location: Chapel St.
the diodes on the rectification side will need to be a heatsinked package, eg to220 or 247
  Reply With Quote
Old 19th December 2004, 12:18 PM   #5
red is offline red  Romania
diyAudio Member
 
Join Date: Feb 2003
Location: Bucharest
Good point. I forgot about that... Thanks.
  Reply With Quote
Old 19th December 2004, 02:16 PM   #6
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
National Semiconductor has an application note for their Simple Switcher line of SMPS chips -- http://www.national.com/an/AN/AN-1229.pdf --
you should take a look as it explains guidelines for traces, ground returns etc. It's a good first start. Some of the traces which carry a lot of current have high di/dt -- so their impedance has to be taken into consideration, even at relatively low switching speeds.

national also has some guidelines for using the LM3524 chip which is a "cousin" of the SG3525 -- they have a PCB layout for a switcher using the LM3524.
  Reply With Quote
Old 21st December 2004, 07:55 PM   #7
diyAudio Member
 
EnvisionAudio's Avatar
 
Join Date: Apr 2002
Location: Dayton, OH
Default Woah...

That layout will likely not work very well - if at all. There are several (I'm being nice) design errors in the layout. The entire layout should be about half that size, at most. The traces not only need to be appropriately thicker, but also routed so as not to radiate or pick up the HF current pulses. I see a lot of antennas on that board. Additionally, the first 20 ampere draw will vaporize a lot of copper.

Here is a layout undergoing testing and prototyping for use with just about any medium power amplifier a DIY'er would want to install in their car. It can handle up to 400W (audio) with ease.

Something along these lines should be your goal. Note that there are copper bus bars used in this design in addition to a 2 side PCB.
Attached Images
File Type: jpg 12vsmps.jpg (65.4 KB, 1866 views)
  Reply With Quote
Old 17th January 2005, 03:33 PM   #8
ssanmor is offline ssanmor  Spain
diyAudio Member
 
Join Date: Jan 2002
Location: Madrid
Hello all.
Nice to see that there is still interest on the Project 89 in ESP.
I wrote that article about 2.5 years ago!

Well, in fact I have designed a very improved version of that power supply, as well as some other stuff, like Class-D audio amplifiers and another SMPS for 230V AC input. We are going to sell that online, all ready built and tested.
We are starting to develop the web page where you will be able to see lots of specifications and info on these and other future products. Please have a look at:

www.coldamp.com

It is still under construction but please be patient!

Best regards,
Sergio
  Reply With Quote
Old 17th January 2005, 04:31 PM   #9
diyAudio Member
 
EnvisionAudio's Avatar
 
Join Date: Apr 2002
Location: Dayton, OH
Default Oh you didn't!

I'm as small a company as you are, but will there be OEM pricing for your products? Or licensing? I might like to use those power supplies.

I'm assuming the 240VAC version simply uses a voltage doubler that can be bypassed for 120VAC operation?

Is this a similar design to the USMPS in the Yahoo groups?
__________________
DCX2496/DEQ2496 Car Audio Conversions
www.envisionelec.net
  Reply With Quote
Old 17th January 2005, 06:13 PM   #10
ssanmor is offline ssanmor  Spain
diyAudio Member
 
Join Date: Jan 2002
Location: Madrid
Quote:
I'm as small a company as you are, but will there be OEM pricing for your products? Or licensing? I might like to use those power supplies.
Nice to hear that. Of course we can talk about these things. Are you mainly interested on the amplifiers or the power supplies?

Please write to info@coldamp.com and we will be very pleased to give you all the info you need.

BTW: I don't know the yahoo groups SMPS, if you can post the URL...

Best regards,
Sergio
  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
Rod Elliott's capacitance multiplier supply 454Casull Power Supplies 21 24th March 2010 02:40 PM
Elliott Sound MOSFET Power Amplifier rmihai Solid State 35 20th September 2005 04:10 PM
switchmode power supply Tekko The Lounge 1 9th January 2005 08:10 PM
Class AB car amp, switchmode power supply, what rails?? SkinnyBoy Solid State 4 8th December 2003 03:26 PM
Removing switchmode power supply noise ih Digital Source 1 25th April 2002 09:18 PM


New To Site? Need Help?

All times are GMT. The time now is 08:01 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