PFC for audio SMPS for Class D supply

[eem2am]

I am sorry but still we have no agreement on whether PFC is required for SMPS for Audio Class D amplifier supply.

Connexelectronics, hypex, coldamp and all the many other manufacturers , are doing SMPS for Class D supply of power > 75W with NO PFC.


So, sorry Christi and all the many others (in fact , everyone, because NOBODY makes SMPS with PFC for audio supply)

...but soon you are ALL IN FOR A SHOCK.

-because the authorities are catching up and they are going to ban all SMPS > 75W with no PFC.
-and they will make you recall all products.

HOW DO I KNOW THIS?

Well......i myself designed a SMPS for Class D supply (peak power was 330W) and i was sacked because i did not use PFC.

They said i had taken a risk on behalf of the company that i had no right to take.

They were furious with me and booted me out immediately......they then phoned all recruitment consultants and told them that i am a dodgy engineer who designs ILLEGAL power supplies.

THEY HAVE SACKED ME AND HAVE MADE SURE THAT I NEVER WORK IN POWER SUPPLIES AGAIN!!!!!!!!!!!!!!!!!!!!


So beware to all you people who do NO PFC, because this fate is coming to you too!

SMPS > 75W with no PFC is ILLEGAL....AGAINST THE LAW.........in just about every country

[Kv3audio]

opps

How many commercial amplifiers out there in the world, NOT using PFC into there 3 ~ 5KW class-d amplifiers.... most of them release Dec 2011


I am sorry becasue you have to redesign your poor SMPS, and re use a PFC.

A well designed SMPS, will give very nice results without PFC!


Good luck

[darkfenriz]

Originally Posted by eem2am

THEY HAVE SACKED ME AND HAVE MADE SURE THAT I NEVER WORK IN POWER SUPPLIES AGAIN!!!!!!!!!!!!!!!!!!!!

I am starting to believe they've done a right thing here.
How hard can it be to read, understand and apply EN61000-3 or equivalent norm instead of starting the same thread here for four or fifth time?

[darkfenriz]

Originally Posted by eem2am

SMPS > 75W with no PFC is ILLEGAL....AGAINST THE LAW.........in just about every country

According to EN61000-3 this is partially true for computers, communication devices and others classified "A" equipment. Audio equipment is classified "D" if I remeber correctly and obeys less strict rules.

Also, any norm specifies what you have to achieve, not by what means, this means you can obey the rule without active PFC as well as break the rule with one.

Just read the goddamn norm!

[luka]

engineer designs what he is told to (written in project contract)illegal or not...
I have never heared that someone within company would be allowed to make something (product) without any knowledge from "up stairs" (boss or project manager)

[dtproff]

Originally Posted by eem2am

I am sorry but still we have no agreement on
SMPS > 75W with no PFC is ILLEGAL....AGAINST THE LAW.........in just about every country

Unfortunately you are correct on this one. I am sorry to here of your troubles ee2am.

I am curious as to whether the employer was looking to you as the lead EE as well as the expert that would guide them through the compliance matrix. I would have expected a separate group/person to have handled the compliance side of this. At a minimum, it should have been brought up by your test house when the units started through safety/EMC qualification process.

Tony

[savu]

small company... maybe

[nigelwright7557]

I have already replied to this topic elsewhere.

European regulations state clearly that low power systems dont need PFC.
Read the regs if you dont believe me.

[dtproff]

Isn't there a Harmonic content section?

Tony

[eem2am]

thankyou dtproff, -you are the one speaking THE sense here.

I tell you i have read EN6100-3-2 and it gives NO EXEMPTION for audio equipment.

Page 8 of the following says audio equipment is class A

http://www.tdipower.com/PDF/white_paper/TW0062.pdf

I am sorry, because i know that you feel uncomfortable with having PFC in audio SMPS's because it makes them more expensive.

At the moment, the authorities "turn a blind eye" to the audio world's lack of use of PFC.

-But that is soon to change......and massive product recalls will ensue....and several companys will go bust.

SORRY, I KNOW THE TRUTH HURTS.....specially since i have already been sacked....i understand your ill-at-ease over this subject -i note how no-one is able to point to the place in EN61000-3-2 where it says you are right and i am wrong.

You tell me to go away and read the specs......I TELL YOU MY FRIEND, DONT YOU THINK I ALREADY DID THIS?......WHEN I WAS BEING SACKED.....DO YOU THINK I DIDNT GO THROUGH EN61000-3-2 WITH A FINE TOOTHED COMB?........because yes, i was desparate to proove that PFC was not required for 330W peak power SMPS for audio Class D supply.

AND ALL I FOUND WAS THAT THERE REALLY IS NO EXEMPTION FOR AUDIO SMPS's....and yes, PFC IS REQUIRED.

This subject will keep returning until we all confess that we are against the law.