DC transformer, x-Chapters 9x.16
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Winfield Hill
Oct 20, 2019, 11:25:30 AM10/20/19
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converters. It's a synchronous dc-dc converter,
with in/out voltage ratio set by a fixed switching
duty cycle. Like ac transformers, they transfer
power in either direction, as a function of who's
above the ratio. The current-ratio also obeys
the voltage-ratio rule, like an ac transformer.
As bus-converters, they're used to convert a 48V
distributed bus, to lower voltages for local use.
https://www.dropbox.com/s/nrp5paq1j1u5756/9x.16_DC-xfmr.pdf?dl=1
--
Thanks,
- Win
DecadentLinux...@decadence.org
Oct 20, 2019, 11:42:42 AM10/20/19
to
@drn.newsguy.com:
transformer works?
You know, the ones with cap banks in them that put out at 60Hz even
when the line or freq sags.
We had a back up generator that caused our UPS systems to fail to
notice the power being back up, and it was due to the generator
somehow making not quite sinosidal waveform or maybe it was full of
spikes... not sure, but these transformers in line with the
generator output fixed the issue.
"Sola" is the most common brand I see, and is what we installed in
the house in Virginia. It was 750 Lbs overall for the 20kVA capacity
we needed.
Arie de Muynck
Oct 20, 2019, 11:50:03 AM10/20/19
to
Fig 9.2.73, upper right terminals should be Vout(HV) not Vout(LV).
Arie
Winfield Hill
Oct 20, 2019, 12:19:59 PM10/20/19
to
is PWR-671, in my RIS-671 project file. It uses
an IR2085 for PWM and MOSFET driving, and has a
zener+7812, so Vmax could be up to 450V, if R13,
D3, elec caps, and MOSFETs are chosen properly.
https://www.dropbox.com/s/wy58c0yxuc6lda8/PWR-671-1_pcb.pdf?dl=1
I first created it for a magnet-control project.
Three different voltages were needed, with 150W
capability, this way we needed only one module.
As the field coils were switched on and off, the
energy went back into the big source-supply cap.
--
Thanks,
- Win
Winfield Hill
Oct 20, 2019, 12:24:29 PM10/20/19
to
--
Thanks,
- Win
Winfield Hill
Oct 20, 2019, 5:46:30 PM10/20/19
to
>Winfield Hill wrote...
>>
>> x-Chapters 9x.16, about DC transformers, AKA bus
>> converters. It's a synchronous dc-dc converter,
>> with in/out voltage ratio set by a fixed switching
>> duty cycle. Like ac transformers, they transfer
>> power in either direction, as a function of who's
>> above the ratio. The current-ratio also obeys
>> the voltage-ratio rule, like an ac transformer.
>> As bus-converters, they're used to convert a 48V
>> distributed bus, to lower voltages for local use.
>>
>>https://www.dropbox.com/s/nrp5paq1j1u5756/9x.16_DC-xfmr.pdf?dl=1
>
> The circuit schematic and PCB board in the photo
> is PWR-671, in my RIS-671 project file. It uses
> an IR2085 for PWM and MOSFET driving, and has a
> zener+7812, so Vmax could be up to 450V, if R13,
> D3, elec caps, and MOSFETs are chosen properly.
>
>https://www.dropbox.com/s/wy58c0yxuc6lda8/PWR-671-1_pcb.pdf?dl=1
ICs work to 600V, the IR2085 is only good to 130V.
But it's faster, with deadtimes as low as 50ns.
Lasse Langwadt Christensen
Oct 21, 2019, 12:40:17 PM10/21/19
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klaus.k...@gmail.com
Oct 21, 2019, 1:08:03 PM10/21/19
to
Williams paper on optimising Roger efficiency is excellent
Cheers
Klaus
Winfield Hill
Oct 21, 2019, 1:31:03 PM10/21/19
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> Win, you really need to cover Royer and Royer Jensen
> converters. That was the original DC Transformers
>
> Williams paper on optimising Roger efficiency is excellent
very little experience with them at this point.
Maybe you'd like to conribute a guest section?
--
Thanks,
- Win
klaus.k...@gmail.com
Oct 22, 2019, 3:59:10 AM10/22/19
to
I will send you a message on LinkedIn
Cheers
Klaus
Winfield Hill
Oct 22, 2019, 4:12:43 AM10/22/19
to
> I will send you a message on LinkedIn
use my yahoo email, which is up-to-date.
--
Thanks,
- Win
Winfield Hill
Oct 22, 2019, 4:40:26 AM10/22/19
to
>
> Winfield Hill wrote...
>> Winfield Hill wrote...
>>>
>>> x-Chapters 9x.16, about DC transformers ...
>>>
>>>https://www.dropbox.com/s/nrp5paq1j1u5756/9x.16_DC-xfmr.pdf
>> The circuit schematic and PCB board in the photo
>> is PWR-671, in my RIS-671 project file. It uses
>> an IR2085 for PWM and MOSFET driving, and has a
>>
>> https://www.dropbox.com/s/wy58c0yxuc6lda8/PWR-671-1_pcb.pdf
>
But it was drawn 10 years ago in PCAD, and then imported
into Altium. More relevant, it was done quickly, using
the standard schematic component images, which are big
and clunky. With those images, one needs to allow more
space between things or it looks a mess. With a little
extra care, PCAD can make very nice schematics. So can
Protel and Altium, although not quite as nice as PCAD.
None of them are decent drawing programs, they don't let
you decently control line widths, angles, curves, etc.
Altium does let us pick font types, fine-tune sizes, and
set snap grids.
We use Illustrator for our book's figures, but that's a
lot more time consuming. We make a careful hand drawing
that's as close as possible to our final expected figure.
Our publisher, C.U.P., hires our drawings out to a firm
in India, where a few of their staff have become quite
proficient, after doing many hundreds of our schematics.
Paul has become a true Illustrator expert, and fixes and
cleans up their work, then we sit together and hand edit
each one for a final pass. But even with this high level
of scrutiny, it's amazing what stupid careless mistakes
leak through. When you're adjusting line spacing, etc.,
it's easy to overlook that the wire is going to the wrong
place, etc. I try to examine the drawing in stages, first
scanning for one type of issue, like part values, then
for another, wiring connections, then the component shape,
etc. But in the process we have still ended up with some
silly errors, like +,- symbols backwards on op-amps, etc.
--
Thanks,
- Win
jla...@highlandsniptechnology.com
Oct 22, 2019, 11:51:06 AM10/22/19
to
wrote:
inputs fit the circuit nicely, which also flipped the power pins,
which we then connected V+ on top, V- on bottom, which was wrong. That
is now on our PCB checklist, and we assign someone to check it yet
again just for luck.
I think PADS makes nice looking schematics, but it's inclined towards
jaggies.
How many copies of AoE have been sold?
--
John Larkin Highland Technology, Inc
lunatic fringe electronics
Winfield Hill
Oct 22, 2019, 12:11:45 PM10/22/19
to
> Our once chronic bug was flipping an opamp symbol to make
> the + and - inputs fit the circuit nicely, which also
> flipped the power pins, which we then connected V+ on
> top, V- on bottom, which was wrong. That is now on our
> PCB checklist, and we assign someone to check it yet
> again just for luck.
second op-amp symbol to use to solve that issue.
> How many copies of AoE have been sold?
mean 150k copies. Probably between 75k and 125k.
--
Thanks,
- Win
John Larkin
Oct 22, 2019, 2:35:08 PM10/22/19
to
wrote:
>jla...@highlandsniptechnology.com wrote...
>>
>> Our once chronic bug was flipping an opamp symbol to make
>> the + and - inputs fit the circuit nicely, which also
>> flipped the power pins, which we then connected V+ on
>> top, V- on bottom, which was wrong. That is now on our
>> PCB checklist, and we assign someone to check it yet
>> again just for luck.
>
> I've made that mistake, but some time ago created a
> second op-amp symbol to use to solve that issue.
>
>> How many copies of AoE have been sold?
>
> I dunno. In its 15th printing now, but that doesn't
> mean 150k copies. Probably between 75k and 125k.
have one already. Plus my copies at work, at home, and in the cabin.
Thanks!
--
John Larkin Highland Technology, Inc
jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
Winfield Hill
Oct 22, 2019, 5:01:57 PM10/22/19
to
>
> Winfield Hill wrote:
>> jla...@highlandsniptechnology.com wrote...
>>> How many copies of AoE have been sold?
>>
>> I dunno. In its 15th printing now, but that doesn't
>> mean 150k copies. Probably between 75k and 125k.
>
> I've bought a dozen or two. I give them to new hires
> if they don't have one already. Plus my copies at work,
> at home, and in the cabin.
>
> Thanks!
--
Thanks,
- Win
John Larkin
Oct 22, 2019, 6:59:40 PM10/22/19
to
wrote:
nine minutes.
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