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'[EE] DC-DC Voltage Converter - How to start'
2006\01\16@074646 by olin piclist

face picon face
Yet another OT post that clearly should have been EE.  When are people
finally going to get this right!!?

Augusto Yipmantin wrote:
> 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?

This is clearly a large and relatively expensive solar panel, at least
compared to a suitable inductor for a switching power supply.  So why are
you trying to avoid a $1.50 inductor?  This seems silly given the
information you provided.


******************************************************************
Embed Inc, Littleton Massachusetts, (978) 742-9014.  #1 PIC
consultant in 2004 program year.  http://www.embedinc.com/products

2006\01\16@083646 by o Yipmantin

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face
Dear Olin,

Excuse me please for use [OT] instead [EE].
And thank you for your question.
This solar panel is a little bit expensive, yes! You are right, but it
is what I receive to do the job.
Maybe a $1.50 inductor will be part of the solution for my project, but
in my country is not possible to get the adequate inductors as new
parts. The only one way that I have to start this project will be
testing many 2nd. hand or used pieces until I find the adequate unit.
And as I am a beginner in this field, may you tell me how can I ask the
group to avoid being silly?

Augusto


-----Mensaje original-----
De: spam_OUTpiclist-bouncesTakeThisOuTspammit.edu [.....piclist-bouncesKILLspamspam@spam@mit.edu] En nombre
de Olin Lathrop
Enviado el: Lunes, 16 de Enero de 2006 12:48 p.m.
Para: Microcontroller discussion list - Public.
Asunto: Re: [EE] DC-DC Voltage Converter - How to start

Yet another OT post that clearly should have been EE.  When are people
finally going to get this right!!?

Augusto Yipmantin wrote:
> 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?

This is clearly a large and relatively expensive solar panel, at least
compared to a suitable inductor for a switching power supply.  So why
are
you trying to avoid a $1.50 inductor?  This seems silly given the
information you provided.


******************************************************************
Embed Inc, Littleton Massachusetts, (978) 742-9014.  #1 PIC
consultant in 2004 program year.  http://www.embedinc.com/products

2006\01\16@085129 by olin piclist

face picon face
Augusto Yipmantin wrote:
> Excuse me please for use [OT] instead [EE].
> And thank you for your question.
> This solar panel is a little bit expensive, yes! You are right, but it
> is what I receive to do the job.
> Maybe a $1.50 inductor will be part of the solution for my project, but
> in my country is not possible to get the adequate inductors as new
> parts.

What country are you in?  Have you tried CoilCraft?  They are very good
about samples, at least here in the US.  They are also well priced for
decent quantity production, and their stuff is well made.  My only gripe
with them is that small quantities are quite expensive, making it difficult
for small volume producers.  However my sourcing folks tell me there are
Asian knockoffs of many of the more popular CoilCraft products that compete
well for the smaller quantity runs.


******************************************************************
Embed Inc, Littleton Massachusetts, (978) 742-9014.  #1 PIC
consultant in 2004 program year.  http://www.embedinc.com/products

2006\01\16@100009 by Alan B. Pearce

face picon face
>Maybe a $1.50 inductor will be part of the solution for
>my project, but in my country is not possible to get the
>adequate inductors as new parts.


I am sure that you could make a suitable one. In most cases the number of
microhenries needed is small enough to be only a few turns on a piece of
ferrite rod.

For your purpose I suspect that you could use a suitably uprated version of
the discrete transistor regulators that people like Russell or Roman Black
designed. Russell had one that took 150V input for a small (5-10V IIRC)
output voltage. Such a design should be reasonably happy with a wide-ish
(Russell again) range of inductor values.

2006\01\16@101027 by Bob Axtell

face picon face
Olin Lathrop wrote:

{Quote hidden}

Dead right-

I discovered that all I had to do to get an identical compoent from an
Asian source was
simply to send a sample. These Chinese analyse the coil on an active
instrument that
identifies every component including the core.

There is even a Tucson/Chinese company that does the engineering here
and makes it
in China, 4 week delay for 1K of 'em, 2 weeks for a free sample.

--Bob

--
Note: To protect our network,
attachments must be sent to
attachspamKILLspamengineer.cotse.net .
1-520-850-1673 USA/Canada
http://beam.to/azengineer

2006\01\16@180152 by tlists

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face
Augusto Yipmantin wrote:

>Dear Olin,
>
>Excuse me please for use [OT] instead [EE].
>And thank you for your question.
>This solar panel is a little bit expensive, yes! You are right, but it
>is what I receive to do the job.
>Maybe a $1.50 inductor will be part of the solution for my project, but
>in my country is not possible to get the adequate inductors as new
>parts. The only one way that I have to start this project will be
>testing many 2nd. hand or used pieces until I find the adequate unit.
>And as I am a beginner in this field, may you tell me how can I ask the
>group to avoid being silly?
>
>Augusto
>
>  
>
You can wind your own inductor and measure the inductance with a
function generator and oscilloscope (if you don't have an L meter)
You can usually get a suitable filtering core from a computer power
supply. The yellow ones are for filtering.

Your voltage requirements indicate that you could almost use the
transformer from a PC power supply. If you lower the switching frequency
a few kHz you could achieve an input voltage in your range and get the
voltage out that you need. This is quite a hack to get working though.

One comment. You measure current in 'A' = Amps, not 'Ah' = Amp*hours
HTH
--
Martin K

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