From: Denny Esterline <desterline@gmail.com>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
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Date: Tue, 18 May 2021 09:51:04 -0700
Subject: Re: [EE] Power Factor Correction
Thread-Topic: [EE] Power Factor Correction
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I'm no great expert, but the response has been so quiet that my
experience may be the best you get.
A couple years ago I got sucked into a ~2kW motor driver project and it
quickly became relevant that PFC was going to be necessary. I made a couple
half-hearted attempts to do it as part of the motor driver based on one of
Microchip's app notes. It quickly spiraled into a rabbit hole of details
that you either have to get _absolutly correct_ or the magic smoke exits
vigorously.
After more unsuccesful effort and expense than I'd like to admit, I tripped
on purchasable PFC modules that I was able to incorporate into the design.
Armed with my fuzzy memory and the Digikey website, here's a representative
unit that (might) be the one I used.
Artesyn Embedded Power AIF04ZPFC-01L

Cost about $300 USD each, but unless you're doing high volume, I can assure
you that your development effort is going to exceed that. :-)


-Denny



On Sun, May 16, 2021 at 3:33 PM Bob Blick <bobblick@outlook.com> wrote:

> I wonder if anyone here has any experience with power factor correction
> for switching power supplies. I don't, but have read this document from
> OnSemi:
>
> https://www.onsemi.com/pub/Collateral/HBD853-D.PDF
>
> Basically it looks like a varying current-mode boost regulator with 385
> volt output, feeding a normal switching supply, is the simplest. Especial=
ly
> if you already have the power supplies and went cheap and bought the ones
> without PFC built in.
>
> Discontinuous mode is the easiest to stabilize, but if I go that route
> I'll need bigger or more MOSFETs to handle the current. On the other hand=
,
> if I breadboarded something touchy with continuous mode, I'll probably ki=
ll
> lots of devices and then just give up in disgust. I'll probably start sma=
ll
> before trying to build a 2KW unit, which is my goal.
>
> Anyway, if anyone has built a PFC controller, I'd love to hear. BTW, this
> is just a hobby project for me.
>
> Thank, Bob
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