PWM Power Supply - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 12th November 2001, 09:44 PM   #1
diyAudio Member
 
Join Date: Nov 2001
Location: Vermont
Send a message via AIM to Mkulikow
I have recently created a 30V/3A DC-DC Converter from a 12 volt battery and was wondering if 2 of these would produce enough power +/-30V @ 6A peak to power a good sized car amplifier. Basically with 2 positive DC-DC converters I can make the +/- supply by connecting them in series and making an analog ground between the 2. My question is basically if this is enough power, the ripple current is less than 10mA and the voltage regulation is +/-1%, good enough??
  Reply With Quote
Old 12th November 2001, 10:41 PM   #2
diyAudio Member
 
Join Date: Nov 2001
Location: Barbados
Smile good !

I like what you have done,by what you have said ,it looks like you are trying to up the current rating of your supply ,in theory it should work .The supplys should be identical with the same specs(well as close as possible).I too am trying to build a car amp ,so far the supply is the killer let me know if you are able any success.
  Reply With Quote
Old 12th November 2001, 10:47 PM   #3
Warp Engineer
On Holiday
 
AudioFreak's Avatar
 
Join Date: Oct 2001
Location: Queensland, Australia
if you use these 2 supplies in series to get +-30V it will only supply 3 amps..........

you need way more current than that ..... dont think amps, think 10's of amps ...... eg. 100 into 4 ohms will need a supply capable of +-30V @ 8 Amps MINIMUM! in practice you would want probably 10 if the amp has a soft start circuit and way more than that if it doesnt ...... generally speaking though, you cant live without a soft start circuit in even a low power car amp due to the turn on current draw.
  Reply With Quote
Old 13th November 2001, 12:28 PM   #4
diyAudio Member
 
Join Date: Nov 2001
Location: Vermont
Send a message via AIM to Mkulikow
Default Hmmmm

Yeah, but these circuit are so small I can have one of these power supplies for every channel, the use a small PWM IC from NSC and a 10A coil and N-Channel FET to drive the current. To think of what I actually have is a 60V supply capable of supplying 6A so I should be able to get 2 of these to drive 12A at +/-60V, that should be enough to drive every channel, I can build one of these on a 4" square board and maybe even get the supply up to 20A with some new component values or by stacking these supplies up, let me know what you think. This converter is also a boost converter, I can use the same IC to drive a transformer to get as much current as my battery can provide in flyback mode. DC-DC Converters are tough

- Mike
  Reply With Quote
Old 13th November 2001, 01:12 PM   #5
Warp Engineer
On Holiday
 
AudioFreak's Avatar
 
Join Date: Oct 2001
Location: Queensland, Australia
as already stated, if u had 2 x 30V @ 3A supplies, you can make a 30V @ 6A supplies or a 60V @ 3A ..... you cannot get 60V @ 6A from 2 x 30V @ 3A.................

also,

if you have 2 x 60V @ 6A supplies, this cannot and will not give you +/-60V @ 12A you need 4 x 60V @ 6A supplies to get +/-60V @ 12A
  Reply With Quote
Old 13th November 2001, 01:16 PM   #6
diyAudio Member
 
Join Date: Nov 2001
Location: Vermont
Send a message via AIM to Mkulikow
ahhhh, missed the critical flaw in my thinking. Now I think I see the problem anywayz. I am going to try going down a new road with a SWPS and hopefully can get the current out of it. Does anyone happen to use PSPICE to do center tapped transformers? Mine does not seem to like them very much.

- Mike
  Reply With Quote
Old 13th November 2001, 01:22 PM   #7
Warp Engineer
On Holiday
 
AudioFreak's Avatar
 
Join Date: Oct 2001
Location: Queensland, Australia
one other thought,

due to the generally low impedance of car speaker setups, increased current drive is needed ..... if you use +/-60V you will probably find you need at least 20-30A to make it viable ....... remember, as voltage increases, so does current draw ........... also remember the importance of a soft start circuit in the situation .....
  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
Split Voltage Switching Power Supply for Power Amp vectorplane Swap Meet 2 23rd April 2011 11:48 PM
LTspice tool for power amp power supply component evaluation andy_c Software Tools 2 23rd August 2009 05:10 PM
Can i use a computer power supply to power audio amplifiers? destroyer X Solid State 91 25th September 2006 04:36 AM
selling high current power supply for power amps. ericpeters Swap Meet 0 14th January 2005 02:21 PM
heater supply (xformer specs are 6.3V 2.5A) as supply for a power LED? jarthel Tubes / Valves 10 21st July 2003 01:30 PM


New To Site? Need Help?

All times are GMT. The time now is 04:35 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