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'[OT] DC-DC Voltage Converter - How to start'
2006\01\15@131518 by o Yipmantin

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Hello friends,

Here asking for some help in the design of a DC to DC Converter.
I have a solar panel with 96 to 100 VDC @ 1.1Ah without load, break
point at 97 VDC and down to 60 VDC @ 0.9 Ah with load.

The idea is to make a DC-DC converter from an input of 97 to 60 VDC to
an output of 14 VDC more or less at 3Ah, this output will be used to
charge a battery system.

Can be possible to do this converter without any inductive device?

Any help or idea is welcome.

Hugs,

Augusto, OA4CVT


2006\01\15@140934 by Denny Esterline

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> Here asking for some help in the design of a DC to DC Converter.
> I have a solar panel with 96 to 100 VDC @ 1.1Ah without load, break
> point at 97 VDC and down to 60 VDC @ 0.9 Ah with load.
>
> The idea is to make a DC-DC converter from an input of 97 to 60 VDC to
> an output of 14 VDC more or less at 3Ah, this output will be used to
> charge a battery system.
>
> Can be possible to do this converter without any inductive device?

Not effectively, but if the question is "is it possible to build a DC-DC
converter without inductors" the answer is yes. Switched capacitor
converters are commonly used for small boost converters (think MAX232). I
guess it would be _possible_ to reverse the general process, that is charge
several capacitors in series and discharge them in parallel. But I've never
seen a switched capacitor converter rated for more than a few milliamps. So
yes, it's _possible_, but I can't recommend it.


Here's an off the wall idea- what about a regular switch mode wall wart /
power brick? The one running my LCD monitor as I type this is rated as 4 A @
12V output, 90-240V AC input. Granted that's an AC input but the way these
things work is they rectify and filter the input voltage before it goes to
the switching stage. If you just tapped the output of your panel to the
internal HV DC rail...
60V with full load is a little low, but it's worth a try

-Denny

2006\01\15@144455 by Mike Hagen

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Yes, I agree with Denny.

Try a switching supply for 110-220.  They make DC out of the AC in and then
convert it down.
Try finding a 40-60 one that outputs 15 Volts (or 12 and trim it up)?  The
110V mode usually goes down near 90-95 V?
You can even take the metal cover off and bypass the full wave rectifier (to
save voltage drop) or tweek the output voltage.  Jameco has a lot to look
it?

Mike, WA6ISP

{Original Message removed}

2006\01\15@144833 by Mike Hagen

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40-60 WATTS
----- Original Message -----
From: "Mike Hagen" <spam_OUTpicdogTakeThisOuTspamdslextreme.com>
To: "Microcontroller discussion list - Public." <.....piclistKILLspamspam@spam@mit.edu>
Sent: Sunday, January 15, 2006 11:45 AM
Subject: Re: [OT] DC-DC Voltage Converter - How to start


{Quote hidden}

>> --

2006\01\15@161714 by Steve Smith

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Reasonably easy. Look up a 3842 you need two chokes in the 500uh to 1mh
(something on and ETD25 core size) the values are not important. You can
make a SEPIC converter very wide input voltage good stable output voltage no
isolation. Feed the 3842 from the output via a diode and use a 1mA bleed
from the supply side to start it.

-----------L---------C-----------D-+----- +ve op
              |             |
 3842    FET  D           L
              S                 |
----------------------------------------- -ve op

It's the power section only but I use this basic circuit from 18V to 300V dc
input at powers up to about 50W it works as step up or step down and it also
works with almost any values. Look up 3842 and set up similar to the flyback
example but changing the power circuit to the above (crapppy ascii) and it
will work. Use something like a 1u/160v poly or a class x as the coupling
cap and a 150nS diode (at least 200v).

Rgds Steve


{Original Message removed}

2006\01\16@032632 by Vasile Surducan

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On 1/15/06, Augusto Yipmantin <EraseMEaugustoyspam_OUTspamTakeThisOuTcentaurocomunicaciones.com> wrote:
> Hello friends,
>
> Here asking for some help in the design of a DC to DC Converter.
> I have a solar panel with 96 to 100 VDC @ 1.1Ah without load, break
> point at 97 VDC and down to 60 VDC @ 0.9 Ah with load.
>
> The idea is to make a DC-DC converter from an input of 97 to 60 VDC to

The charger with work always with load, else it's not a charger so
you might consider the input of 60V.  0.9Ah does tell nothing about
the momentary current. So which is the maximum current you may get
from the pannel at 60V with full bright ?
This will be the load current of the charger. You have to limit the
charging current of the accumulator to source in the worst situation
the maximum current.

cheers,
Vasile


{Quote hidden}

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