Comments on: 300 Watt ATX Power Supply Fixed

By: Momin Khan

Momin Khan — Sun, 10 Apr 2016 10:19:10 +0000

Thank you for this post. This post is very helpful to people. Who want to solve PSU problem himself......

Likes(0)Dislikes(0)

By: mahienn

mahienn — Wed, 10 Feb 2016 22:28:41 +0000

hi to all
very nice as well as informative

thank u Sirs

helo sir jestine how u doin?

i've been missing your articles plz share some of your experiences

if you find time

i'm your fan no.1

thank you god bless you...

Likes(0)Dislikes(0)

By: Anwar Shiekh

Anwar Shiekh — Mon, 29 Jun 2015 14:16:02 +0000

I never put higher voltage capacitors in as the ESR (Equivalent series resistance) may be higher and I read that it may have problems maintaining the oxide layer.

Likes(1)Dislikes(0)

By: Albert

Albert — Fri, 01 May 2015 18:19:01 +0000

In reply to Humberto.

Hi Humberto,

Glad that you appreciated it! I hope you find it interesting.
And you're Welcome !!
The article came from the Electronics Magazine Elektor. (Maybe you can find more on the internet about ATX power supplies in Elektor. One other article I know dealed with modifying ATX supplies internally).
I wrote some published articles in Elektor too. (See 3 time-zone DCF clock reciever with adaptation to Picee board. Elektor December 2007).
Cheers.
Albert.

Likes(0)Dislikes(0)

By: Humberto

Humberto — Thu, 30 Apr 2015 11:41:16 +0000

In reply to Humberto.

Thanks Mr. Albert for the pdf sent by means of Mr. Jestine Yong. If you have some more valuable information or maybe websites, do not hesitate in send them.
Have a good day.

Likes(2)Dislikes(0)

By: Humberto

Humberto — Tue, 28 Apr 2015 16:25:54 +0000

In reply to Paris Azis.

Thanks Paris and albert, but I've been repairing Computer's SMPS and in this kid of SMPS the manufacturers do not permit to test them without a load.
Best regards.

Likes(1)Dislikes(0)

By: Robert Calk

Robert Calk — Sun, 26 Apr 2015 03:42:00 +0000

In reply to Robert Calk.

Oops, I meant "Pollak".

Likes(0)Dislikes(0)

By: Robert Calk

Robert Calk — Sat, 25 Apr 2015 11:50:29 +0000

In reply to Albert.

From what I read it should be called the "Pollack" diode. I guess they didn't want to give credit to a Polish man.

Likes(3)Dislikes(0)

By: Vicken Mardiros

Vicken Mardiros — Sat, 25 Apr 2015 06:16:25 +0000

very nice work and thanks for sharing in details...

Likes(0)Dislikes(0)

By: Paris Azis

Paris Azis — Fri, 24 Apr 2015 20:31:54 +0000

In reply to Humberto.

Hello Humberto,

This was very likely to happen when testing much older designs. All the modern designs, especially those including active PFC in their input, are very smart designs and thus such a risk is practically eliminated. On the other hand all of them use the so called "minimum load resistors" at their outputs (you can "see" them by a simple Ohmic measurement of their outputs when the unit is off) which totally eliminate the risk of oscillation or any instability during start-up which is the main cause of such a failure.
There is only one exception to this (considering that the minimum load resistors are intact). One or more of the output filter electrolytic capacitors having high ESR, which is very likely to provoke this cause to appear and then destroy the switching semiconductors at the primary side.
Nevertheless, as a good habbit and as regards full safety in testing, I totally agree with your advice.

Best Regards

Likes(5)Dislikes(0)