"UCLAN" = the Original Monkey's Uncle.

Phil Allison wrote:

Please do not confuse Power Factor Correction (PFC) with power supply
efficiency. They are two separate items.

** OK so far.

Gee, thanks. [Red flag warning!!!]

PFC can be either active or passive,

** Hmmmm...

Careful, a hint of ignorance is showing.

but usually alters the highly capacitive input of SMPSs.

** TOTAL ******** !!!

They are not capacitive, there is no phase angle.

And it's finally out. He's a total loon.


** This arrogant IMBECILE is about to get a lesson !!!


There is a big 400vdc capacitor (or two 200vdc caps in series) just after
input rectifiers on the AC input.


** And because they are * AFTER * the rectifiers there is NO cap
reactance or phase angle effects involved.


They charge to the peak value of the input
AC voltage, or 1.414 times the RMS value.


** The caps can only draw current when the diodes are forward biased and
cannot pass any current back to the supply.

Negates all capacitive reactance effects.


Since the cap(s) draw their maximum
current when at lowest charge (zero cross-over point),


** 100% ****ING WRONG !!!!!!!!!!!

The caps can only draw charging current when the AC supply voltage is
greater than the voltage already on the cap - so ( aside from the very
first cycle ) they charge at AC voltage peaks ONLY !!!!!!!!


and draw their least amount of current when charged to their highest
point,


** Insane CRAP !!!!!!!!!!!!!!!

Even one moment's intelligent thought shows that simply CANNOT be true.


the current waveform
*leads* the voltage waveform by 90 degrees.


** Absolute ******** !!!

Max current draw **coincides** with peak AC voltage - there is ZERO
phase angle.

Time for you to go play with the demented Orang-utans

- DICKHEAD !!




...... Phil