Digital power factor correction

[PCBONEZ]

Re: Digital power factor correction

Sounds a bit like: 'real' 'simulated' Indian leather.

[Toasty]

Re: Digital power factor correction

How does a hot coil make up for APFC? IIRC, PC said this before that the heating there wastes the energy, so what's the point of it to begin with?

[everell]

Re: Digital power factor correction

Thank you 370forlife. Both articles were very interesting......and "informative".

I have been banging my head against the wall for the past several weeks trying to fix a AGI 400 watt power supply with APFC. It would blow out one of the PFC transistors on power up. I kept looking for problems on the output side, but it turns out the problem was in the APFC circuit.

The way I found the problem: I was curious as to the Inductance value of the booster coil for "typical" APFC circuit. So I removed the booster coil and measured it with a LCR meter. Inductance was 0.1 uHy. Should have been more than that! Unwound a few turns and found the short. Now I am suspicious that HEAT may be a problem for these booster coils in "cheap" power supplies. I have noticed that the ones I have worked on get very HOT. Do you think this is because of cheap lossy cores being used, or should one expect the coil to run superhot? Since these APFC circuits are designed for use in both US and Europe, do you think increasing inductance would reduce heat for APFC in the US?

[370forlife]

Re: Digital power factor correction

[Toasty]

Re: Digital power factor correction

>>I used to parallel [synchronize phases] <<

Light bulb?

[PCBONEZ]

Re: Digital power factor correction

So what does that have to do with the need breed of APFC circuits using the new CS1500 super duper chip???

You don't understand how phase angles relate to PFC?
What do you think PFC does?
.

[everell]

Re: Digital power factor correction

LOL, no you don't get it. - It's called sarcasm.
I used to parallel [synchronize phases] and and shift loads between 2.5 MW 3 phase turbine generators on a 4160v grid as part of my job.

So what does that have to do with the need breed of APFC circuits using the new CS1500 super duper chip???

[PCBONEZ]

Re: Digital power factor correction

You don't get it!!!!

LOL, no you don't get it. - It's called sarcasm.
I used to parallel [synchronize phases] and and shift loads between 2.5 MW 3 phase turbine generators on a 4160v grid as part of my job.

[PCBONEZ]

Re: Digital power factor correction

CFL = Compact fluorescent lamp. It's just another shape of fluorescent lamp.
They usually use an electronic ballast but they aren't limited to it.

I think your assumption is wrong. [Though definitely an interesting point!]

"Traditional" florescent lights as well as CFLs use a lot more that one type of ballast including resistive, inductive and electronic ballasts with inverters.
Electronic ballasts which have been around since the 70's I think and have become more common over time.
When it comes to current products I *think* Iron core ballasts are only common in fixtures for tubes over 4 foot now.
[My last shop had 8' tubes. I hate those things!]

As to what kind of load it is you'd have to know what kind of ballast is in use.
With one as pictured you would have to know what [SMPS or Linear PS] is creating the 12 vDC to know what kind of load it is.



Then there are SMPS types:
https://cdn.badcaps-static.com/pdfs/...89b385be1a.pdf

.

[PCBONEZ]

Re: Digital power factor correction

You don't get it!!!!

An electric motor is an inductive load, so current lags voltage. A switching power supply (PC, plasma TV, or whatever) is a capacitive load, so current leads voltage. The two compensate for one another.

They can't compensate for each other if there is PFC is the PSU now can they...

[PlainBill]

Re: Digital power factor correction

OH I KNOW!
-
We could require all new refrigerators to have 6" of insulation instead of the typical 2" because that motor with the sucky PF kicking on all the time in millions of refrigerators is hurting the power companies wallet.

Oh and another!
-
Take that power hog 50-200 watt video card you have to recycle and use the on-board instead.
[And if you didn't and you're hooting about PFC being green then you're a hypocrite.]

.

You don't get it!!!!

An electric motor is an inductive load, so current lags voltage. A switching power supply (PC, plasma TV, or whatever) is a capacitive load, so current leads voltage. The two compensate for one another.

Now a question. An incandescent light bulb is a resistive load. A traditional florescent light bulb (with an iron core ballast) is an inductive load. What kind of load does a CFL present? And are they going to add PFC to those, too?

PlainBill

[Per Hansson]

Re: Digital power factor correction

That would mean that the "mains" capacitor would be running with 385 to 400 volts instead of 320 volts. Interesting (maybe spectacular!)................

Please do have a camera running when you try it the first time

[weirdlookinguy]

Re: Digital power factor correction

Ahh, I see.

Good to know .

[PCBONEZ]

Re: Digital power factor correction

Rice Grinder = Jap Bike.

[weirdlookinguy]

Re: Digital power factor correction

a tiny ricer

Rice is when some dumbass makes a laughingstock out of an import by trying to make it look cool. Normal import =/= ricer.

[PCBONEZ]

Re: Digital power factor correction

and trash that sweet muscle car and buy a tiny ricer too...

You'll do more harm to the environment manufacturing that ricer than maintaining the muscle car ever would.

[ratdude747]

Re: Digital power factor correction

OH I KNOW!
-
We could require all new refrigerators to have 6" of insulation instead of the typical 2" because that motor with the sucky PF kicking on all the time in millions of refrigerators is hurting the power companies wallet.

Oh and another!
-
Take that power hog 50-200 watt video card you have to recycle and use the on-board instead.
[And if you didn't and you're hooting about PFC being green then you're a hypocrite.]

.

and trash that sweet muscle car and buy a tiny ricer too...

video card upgrades use more juice but enhance performance... bad analogy, but i see your point.

[PCBONEZ]

Re: Digital power factor correction

Reminds me of the Toyota Prius. Sure they put out less emissions, but how much more emissions are put out making the car with all the extra crap that goes into them?

Good point.

[370forlife]

Re: Digital power factor correction

Take that power hog 50-200 watt video card you have to recycle and use the on-board instead.
[And if you didn't and you're hooting about PFC being green then you're a hypocrite.]

.

Reminds me of the Toyota Prius. Sure they put out less emissions, but how much more emissions are put out making the car with all the extra crap that goes into them?

[Toasty]

Re: Digital power factor correction

Oh god! Too much sugar in the coffee again, eh?