need help new to smps power supply design

venki · 4th June 2005, 06:03 PM

Hi,

I am trying to make an AMP a 3-way speaker system. Each speaker is driven by a 35W ampl. So the total power comes to about.210 watts. The voltage required is around +/-30 V. If i go for a comventional PSU it will cost me a lot.

By the way I am from india.

I would like to build a SMPS. But the problem is I dont know anything about it. Any SMPS gurus please help me out with design.

The power supply requirement is

+/- 30V
20A.

I would like to get info about how to build a transformer for the same. The dimensions etc. How to calculate it. Also since I am from india, will the parts be availble in india? (core etc).

Thanx in advance,
venki.

sss · 4th June 2005, 11:28 PM

yo , man this will be a verry difficult project

i think u should use a simple traffo

venki · 8th June 2005, 03:28 AM

Ok I think I am too ambitious

I have brought down the current rating from 20A to 10A and voltage to +/- 25V (bcus i kicked our one IC from my design I am planning to go with passive crossovers instead of the active one.

Can anyone help me out now pleezzz...

Thanx,
Venki.

ghemink · 8th June 2005, 06:42 AM

Quote:

Originally posted by venki
Ok I think I am too ambitious I have brought down the current rating from 20A to 10A and voltage to +/- 25V (bcus i kicked our one IC from my design I am planning to go with passive crossovers instead of the active one.

Can anyone help me out now pleezzz...

Thanx,
Venki.

Don`t go for an SMPS, too much trouble and designing one from scratch is not easy, not cheap and dangerous (high voltages). Just get a normal conventional transformer, a diode bridge and a few caps.

Best regards

Gertjan

richwalters · 21st June 2005, 07:51 PM

hi there...wev'e been through this before......a disclaimer is that advice isn't given to anyone who hasn't grasped the dangers of going into the 1st time off-line smps deepend. Off-line designs or H.V work require a good oscilloscope and understanding what one sees......Start by doing something simpler.....i.e go linear......

richj

Eva · 22nd June 2005, 01:02 AM

For powers up to 400W an AT or ATX PC power supply may be modified to do the job. However, this requires some knowledge about SMPS operation and SMPS transformer winding abilities.

venki · 22nd June 2005, 03:26 AM

Hello all,

thanx for the response. The problem with not going with the conventional design is that we dont get 10A transformers here. I will have to get it wound it will cost me a lot (

). Eva I do know basics about SMPS I studied about this in my graduation. If any of you could give me some tips to modify the SMPS of PC it would be nice.

Thanx,

Venki

richwalters · 22nd June 2005, 08:28 AM

Quote:

Originally posted by venki
Hi,

I would like to build a SMPS. But the problem is I dont know anything about it. Any SMPS gurus please help me out with design.

venki.

Contradiction...... quote....."Eva I do know basics about SMPS I studied about this in my graduation".

I'm puzzled.....

richj

aman · 23rd June 2005, 11:45 AM

hi venki,
i m aman from india living in delhi and interested in building amplifiers. My advice to u is that since building smps is very difficult u may go for the conventional psu. If u cant get a 10ampere transfromer then u can u can use two transformers of 5amp each for two channels (each three way system) and these are easily available in india.

venki · 24th June 2005, 08:10 AM

hi richwalters,

What i mean is that i just know the theory that is it but dont have any idea about the tranformers (mainly designing size other factors). Sorry about that I didnt mean to confuse you

aman about the 5 amps tranfomer i think it is a good alternative? i will have to check it out in our local store.

Thanx again to all..

venki

4th June 2005, 06:03 PM	#1
venki diyAudio Member Join Date: May 2005 Location: india	need help new to smps power supply design Hi, I am trying to make an AMP a 3-way speaker system. Each speaker is driven by a 35W ampl. So the total power comes to about.210 watts. The voltage required is around +/-30 V. If i go for a comventional PSU it will cost me a lot. By the way I am from india. I would like to build a SMPS. But the problem is I dont know anything about it. Any SMPS gurus please help me out with design. The power supply requirement is +/- 30V 20A. I would like to get info about how to build a transformer for the same. The dimensions etc. How to calculate it. Also since I am from india, will the parts be availble in india? (core etc). Thanx in advance, venki.

4th June 2005, 11:28 PM	#2
sss diyAudio Member Join Date: Jul 2003 Location: Israel , haifa	yo , man this will be a verry difficult project i think u should use a simple traffo __________________ if you are not living on the edge you are taking too much space

23rd June 2005, 11:45 AM	#9
aman diyAudio Member Join Date: Mar 2004 Location: delhi	smps hi venki, i m aman from india living in delhi and interested in building amplifiers. My advice to u is that since building smps is very difficult u may go for the conventional psu. If u cant get a 10ampere transfromer then u can u can use two transformers of 5amp each for two channels (each three way system) and these are easily available in india.

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8th June 2005, 03:28 AM	#3
venki diyAudio Member Join Date: May 2005 Location: india	Ok I think I am too ambitious I have brought down the current rating from 20A to 10A and voltage to +/- 25V (bcus i kicked our one IC from my design I am planning to go with passive crossovers instead of the active one. Can anyone help me out now pleezzz... Thanx, Venki.

21st June 2005, 07:51 PM	#5
richwalters diyAudio Member Join Date: Sep 2003 Location: Alps:Tube amp designs over 150W, SMPS guru.	hi there...wev'e been through this before......a disclaimer is that advice isn't given to anyone who hasn't grasped the dangers of going into the 1st time off-line smps deepend. Off-line designs or H.V work require a good oscilloscope and understanding what one sees......Start by doing something simpler.....i.e go linear...... richj

22nd June 2005, 01:02 AM	#6
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	For powers up to 400W an AT or ATX PC power supply may be modified to do the job. However, this requires some knowledge about SMPS operation and SMPS transformer winding abilities.

22nd June 2005, 03:26 AM	#7
venki diyAudio Member Join Date: May 2005 Location: india	Hello all, thanx for the response. The problem with not going with the conventional design is that we dont get 10A transformers here. I will have to get it wound it will cost me a lot ( ). Eva I do know basics about SMPS I studied about this in my graduation. If any of you could give me some tips to modify the SMPS of PC it would be nice. Thanx, Venki

24th June 2005, 08:10 AM	#10
venki diyAudio Member Join Date: May 2005 Location: india	hi richwalters, What i mean is that i just know the theory that is it but dont have any idea about the tranformers (mainly designing size other factors). Sorry about that I didnt mean to confuse you aman about the 5 amps tranfomer i think it is a good alternative? i will have to check it out in our local store. Thanx again to all.. venki

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