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Which topology for 400w

Y

Yzordderrex

Jan 1, 1970
0
I have to design a converter for 400w. input voltage is 20-32 and
output is along similar lines and is variable - under the micros
command. Current is about 15amps, and supply has to be clean. I'll
be getting into the project next week and I thought I would run it up
the SED flagpole.

A buck-boost converter was tried using one inductor. When the
commanded output voltage was near the input voltage the power supply
would be in a zone where it was switching back and forth between buck
and boost modes and there was some unfilterable lower frequency noise
spurs showing up.

Supply obviously doesn't have to be isolated but I think a pair of
interleaved forward converters might be a nice way to go. Other
prospects are a single forward with maybe an active clamp type of
reset. Other possibility would be seperate boost and buck controllers
in series with maybe a pic to supervise them.

Profile is very short and I have a heatsink to work with so I'm
thinking TO-220s on a copper plate with the board resting on top and
planar magnetics. Maybe one of those Berquist boards that are
bonded to an aluminum plate might work too. I have a decent heatsink
to bolt the module to.

So I'm interested to hear comments on why one topology might be better
than another.

Regards,
Bob
N9NEO
 
Y

Yzordderrex

Jan 1, 1970
0
I have to design a converter for 400w. input voltage is 20-32 and
output is along similar lines and is variable - under the micros
command. Current is about 15amps, and supply has to be clean. I'll
be getting into the project next week and I thought I would run it up
the SED flagpole.

A buck-boost converter was tried using one inductor. When the
commanded output voltage was near the input voltage the power supply
would be in a zone where it was switching back and forth between buck
and boost modes and there was some unfilterable lower frequency noise
spurs showing up.

Supply obviously doesn't have to be isolated but I think a pair of
interleaved forward converters might be a nice way to go. Other
prospects are a single forward with maybe an active clamp type of
reset. Other possibility would be seperate boost and buck controllers
in series with maybe a pic to supervise them.

Profile is very short and I have a heatsink to work with so I'm
thinking TO-220s on a copper plate with the board resting on top and
planar magnetics. Maybe one of those Berquist boards that are
bonded to an aluminum plate might work too. I have a decent heatsink
to bolt the module to.

So I'm interested to hear comments on why one topology might be better
than another.

Regards,
Bob
N9NEO

Come on now fellas, lets get this project started on the right foot.
I tell my boss I've assembled one of the finest design teams in the
world. He expects results. I've probably rambled on and given way
too much information in my OP. My bad. Just pick me out a converter
then and I'll do the rest.

Kind regards,
NEO
 
H

Harry Dellamano

Jan 1, 1970
0
Yzordderrex said:
Come on now fellas, lets get this project started on the right foot.
I tell my boss I've assembled one of the finest design teams in the
world. He expects results. I've probably rambled on and given way
too much information in my OP. My bad. Just pick me out a converter
then and I'll do the rest.

Kind regards,
NEO
I like the one inductor BB (Buck Boost topology). You have complete control
of input current, output current and voltage. Inductor always clamped to
both rails so no snubbers needed. All semi voltages inside the rails and
there are some great 55V MOSFETS and Schottky diodes. Only one magnetic
needed for complete design. Heat spread over four MOSFETS for good heat
spreading. Only drawback is both input and output currents are discontinuous
so interleaving two channels would be sick, as in sweet! What is not to
like?
Ok, so you hate the topology because you had a problem and couldn't fix it.
You can't publish the schematic so we can fix it because it is propriety
information. So changing topologies will fix all problems.
What control chip did you use for the BB? The better ones have robust
hystersis for changing modes.
Cheers,
Harry
 
H

Harry Dellamano

Jan 1, 1970
0
Harry Dellamano said:
I like the one inductor BB (Buck Boost topology). You have complete
control of input current, output current and voltage. Inductor always
clamped to both rails so no snubbers needed. All semi voltages inside the
rails and there are some great 55V MOSFETS and Schottky diodes. Only one
magnetic needed for complete design. Heat spread over four MOSFETS for
good heat spreading. Only drawback is both input and output currents are
discontinuous so interleaving two channels would be sick, as in sweet!
What is not to like?
Ok, so you hate the topology because you had a problem and couldn't fix
it. You can't publish the schematic so we can fix it because it is
propriety information. So changing topologies will fix all problems.
What control chip did you use for the BB? The better ones have robust
hystersis for changing modes.
Cheers,
Harry
So you ask for help, I try to give you help but you don't answer!
Why should we try to help you?
Harry
 
H

Harry Dellamano

Jan 1, 1970
0
MooseFET said:
No it isn't. You've quoted a case where it wasn't.

Watt (James) is a person's name and must be capitalized.
Harry
 
E

Eeyore

Jan 1, 1970
0
MooseFET said:
No it isn't. You've quoted a case where it wasn't.

As an SI unit, when watts are written as a single letter they should be upper
case. So it should be 400W. 400 watts is OK though.

Graham
 
M

MooseFET

Jan 1, 1970
0
Watt (James) is a person's name and must be capitalized.
Harry


It is also a unit of measure and thus *should* be capitalized. That
is a different thing from *always*. I guess I should have added
the :)
 
Y

Yzordderrex

Jan 1, 1970
0
So you ask for help, I try to give you help but you don't answer!
Why should we try to help you?
Harry- Hide quoted text -

- Show quoted text -

Sorry Harry. I am moving a few hundred miles this week - furniture,
cars, pets and so forth. My computer is packed up and I am now at in-
laws house. I have been mulling over your first reply and I will get
back to the group early next week. I would like to hear of more
robust controllers. Sorry to the others who are concerned about the
little w I used, and I agree that it should be capitol or perhaps it
is capital. Heheh.

Later,
Yzordderrex
 
S

Spurious Response

Jan 1, 1970
0
No it isn't. You've quoted a case where it wasn't.


Wrong, dipshit. The electrical term for power is a capital W.

A lower case w is not an electrical term for power.
 
S

Spurious Response

Jan 1, 1970
0
It is also a unit of measure and thus *should* be capitalized. That
is a different thing from *always*. I guess I should have added
the :)


It has absolutely NOTHING to do with the fact that it is a "unit of
measure" either, as there are several "units of measure" which do not
follow your ill claimed rule.

THIS PARTICULAR unit of measure, however, IS always capitalized.
 
L

Lamey

Jan 1, 1970
0
It has absolutely NOTHING to do with the fact that it is a "unit of
measure" either, as there are several "units of measure" which do not
follow your ill claimed rule.

THIS PARTICULAR unit of measure, however, IS always capitalized.


Backpedeling again Prongboi?

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M

MooseFET

Jan 1, 1970
0
It has absolutely NOTHING to do with the fact that it is a "unit of
measure" either, as there are several "units of measure" which do not
follow your ill claimed rule.

THIS PARTICULAR unit of measure, however, IS always capitalized.


Once again you get it wrong. The very person you are complaining
about didn't capitalize the "w". How can you say "something IS always
done" when you quite the counter example? You can say it *should*
always be done but that isn't what you said.
 
L

Lamey

Jan 1, 1970
0
You are a fucking joke for even replying to the kook troll LameyTard.
Your obsession with me is noted.

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#6 Lits Slut
#9 Cog in the AUK Hate Machine
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#11 Most posting trolls/hunters/flonkers 2007
#1 Disenfranchised AUK Kookologist.
#1 AUK Galactic Killfile Award
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neon

Oct 21, 2006
1,325
Joined
Oct 21, 2006
Messages
1,325
IF I was you i would design a pre-regulator to work lets say a minimumn voltage when input are variable lets say it a must. it is not very efficient i agree but it would be solid .
 
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