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: piclist-bounces@mit.edu [mailto:piclist-bounces@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.


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