Re: Power Supply Design help


"Harry Dellamano" <harryd@xxxxxxxxxxxxx> wrote in message
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"Genome" <ilike_spam@xxxxxxxxxxx> wrote in message
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"Harry Dellamano" <harryd@xxxxxxxxxxxxx> wrote in message
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"Genome" <ilike_spam@xxxxxxxxxxx> wrote in message
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You can get a lot of information from the Texas Instruments website
about how to implement power factor corrected supplies.

If you have a look at

http://www.genomerics.org

There is a section which deals with the subject from a theoretical
standpoint. There are also some switching models in LTspice which you
may find useful. Watch out, some of the linear modelling is a bit
'iffy'. The AC results are correct but the DC results won't be 100%.

I'm going to have to sort that out.

DNA
Super nice job. In the PFC section you start with a 3 phase system to
explain why we need PFC. Then you design a discrete, single phase PFC.
How do we combine this signal channel into a 3 phase input, PFC design?
Please only answer if you can count backwards from 100 to 80 in <15 sec
using British units. Then, do it again in metric units.
Regards,
Harry


Thank you very nicely.

I seem to have designed a single phase PFC because I'm dealing with a
single phase system. The description of a three phase system is to
explain how power is distributed and then 'balanced' in domestic
situations, which is my target area, to avoid phase imbalance and neutral
currents. Then goes on to explain how electronic supplys mess up things
anyway.

I have not specifically looked at (tell a lie, I have considered it)
three phase systems because 'true' power factor correction in those
circumstances is not a trivial thing. Messes with my head anyway and the
question was for single phase. There might be something called a 'Vienna
Converter' but it all looks very complicated and may well be that way
because it is.

Should I go and hunt about for some stuff, invent some stuff or will you
spill the beans?.....

DNA

You started your discussion in a three phase world so I thought, oh boy,
he is going to design a 3 phase PFC which I have never done but I'm
interested because someday I will have to design one.
No need to hunt nor invent. Thanks for your input.
I don't spill beans, I eat and exhaust fumes in a 50/50 duty system. Not
100% efficient so some waste is generated.
Harry



Ah.... but then I thought.....

http://www.genomerics.org/harry/harry.html

Psst, don't tell anyone else or IXYS coz we can have a patent on it :-)

DNA


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