Power Conversion Electronics

I just purchase a Silverstone Power Supply Unit (PSU) for my PC.

I am amaze with the PFC (Power Factor Correction) rating of over 0.96,
which, according to some indicators, means it's 96% efficient. (4%
wastage as heat).

Since it's a new unit I dare not to open up the PSU to see what type
of electronics they are using.

So I post the question here ----

Can anyone tell me what type of Power Conversion Electronic Devices
they use in those high PFC rating PSU?

Thank you all !!!

On Sun, 26 Apr 2009 02:20:26 -0700 (PDT), pg
wrote:

I just purchase a Silverstone Power Supply Unit (PSU) for my PC.

I am amaze with the PFC (Power Factor Correction) rating
of over 0.96, which, according to some indicators,
means it's 96% efficient. (4% wastage as heat).

PFC and efficiency are not the same thing.
http://en.wikipedia.org/wiki/Power_factor_correction
http://en.wikipedia.org/wiki/Energy_...ion_efficiency

pg wrote:
I just purchase a Silverstone Power Supply Unit (PSU) for my PC.

I am amaze with the PFC (Power Factor Correction) rating of over 0.96,
which, according to some indicators, means it's 96% efficient. (4%
wastage as heat).

Since it's a new unit I dare not to open up the PSU to see what type
of electronics they are using.

So I post the question here ----

Can anyone tell me what type of Power Conversion Electronic Devices
they use in those high PFC rating PSU?

Thank you all !!!

Something like this, perhaps

http://www.onsemi.com/pub_link/Collateral/NCP1653-D.PDF

Sylvia.

On Apr 26, 2:33*am, Ken wrote:
On Sun, 26 Apr 2009 02:20:26 -0700 (PDT), pg
wrote:

I just purchase a Silverstone Power Supply Unit (PSU) for my PC.

I am amaze with the PFC (Power Factor Correction) rating
of over 0.96, which, according to some indicators,
means it's 96% efficient. (4% wastage as heat).

PFC and efficiency are not the same thing.http://en.wikipedia.org/wiki/Power_f...ion_efficiency

Many thanks for the info !!

On Sun, 26 Apr 2009 02:20:26 -0700, pg rearranged some electrons to say:

I just purchase a Silverstone Power Supply Unit (PSU) for my PC.

I am amaze with the PFC (Power Factor Correction) rating of over 0.96,
which, according to some indicators, means it's 96% efficient. (4%
wastage as heat).

Since it's a new unit I dare not to open up the PSU to see what type of
electronics they are using.

So I post the question here ----

Can anyone tell me what type of Power Conversion Electronic Devices they
use in those high PFC rating PSU?

Thank you all !!!

0.96 power factor does not mean 96% efficient. But, to answer your
question, active power factor correction means that the front end of the
power supply tries to keep the phase between the voltage and current
waveforms as small as possible.

Sylvia Else wrote:
pg wrote:
I just purchase a Silverstone Power Supply Unit (PSU) for my PC.

I am amaze with the PFC (Power Factor Correction) rating of over 0.96,
which, according to some indicators, means it's 96% efficient. (4%
wastage as heat).

Since it's a new unit I dare not to open up the PSU to see what type
of electronics they are using.

So I post the question here ----

Can anyone tell me what type of Power Conversion Electronic Devices
they use in those high PFC rating PSU?

Thank you all !!!

Something like this, perhaps

http://www.onsemi.com/pub_link/Collateral/NCP1653-D.PDF

Sylvia.

Hmm.... I wonder how those would handle an input in the form of a
"modified sine wave", which would more accurately be described as a
modified square wave, as typically produced by cheaper UPSs.

An ordinary PC PS wouldn't notice the difference.

Sylvia.

On Apr 26, 7:08*am, Sylvia Else wrote:
Sylvia Else wrote:
pg wrote:
I just purchase a Silverstone Power Supply Unit (PSU) for my PC.

I am amaze with the PFC (Power Factor Correction) rating of over 0.96,
which, according to some indicators, means it's 96% efficient. (4%
wastage as heat).

Since it's a new unit I dare not to open up the PSU to see what type
of electronics they are using.

So I post the question here ----

Can anyone tell me what type of Power Conversion Electronic Devices
they use in those high PFC rating PSU?

Thank you all !!!

Something like this, perhaps

http://www.onsemi.com/pub_link/Collateral/NCP1653-D.PDF

Sylvia.

Hmm.... I wonder how those would handle an input in the form of a
"modified sine wave", which would more accurately be described as a
modified square wave, as typically produced by cheaper UPSs.

An ordinary PC PS wouldn't notice the difference.

Most power factor correction circuit will run on a rounded off square
wave without any trouble. In the short term, they watch the input
voltage and match the current to that. They don't make their own sine
function to match the current to.


Sylvia.

On Apr 26, 5:32*am, david wrote:
On Sun, 26 Apr 2009 02:20:26 -0700, pg rearranged some electrons to say:

I just purchase a Silverstone Power Supply Unit (PSU) for my PC.

I am amaze with the PFC (Power Factor Correction) rating of over 0.96,
which, according to some indicators, means it's 96% efficient. (4%
wastage as heat).

Since it's a new unit I dare not to open up the PSU to see what type of
electronics they are using.

So I post the question here ----

Can anyone tell me what type of Power Conversion Electronic Devices they
use in those high PFC rating PSU?

Thank you all !!!

0.96 power factor does not mean 96% efficient. *But, to answer your
question, *active power factor correction means that the front end of the
power supply tries to keep the phase between the voltage and current
waveforms as small as possible.

It also tries not to draw any current at harmonics. It is unfortunate
that one term is now used for two effects but we are stuck with it.

On Apr 26, 11:33*am, MooseFET wrote:
It also tries not to draw any current at harmonics. *It is unfortunate
that one term is now used for two effects but we are stuck with it.

Displacement Factor is the fudamental only.

Tim

pg wrote:

I just purchase a Silverstone Power Supply Unit (PSU) for my PC.

I am amaze with the PFC (Power Factor Correction) rating of over 0.96,
which, according to some indicators, means it's 96% efficient. (4%
wastage as heat).

Since it's a new unit I dare not to open up the PSU to see what type
of electronics they are using.

So I post the question here ----

Can anyone tell me what type of Power Conversion Electronic Devices
they use in those high PFC rating PSU?

Please do not confuse Power Factor Correction (PFC) with power supply
efficiency. They are two separate items. PFC can be either active or
passive, but usually alters the highly capacitive input of SMPSs.

Google "PFC".