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Reply-To: "fred bartoli"
From: "fred bartoli"
Subject: Re: Solar Cell Voltage Booster?
Date: Tue, 17 Dec 2002 14:03:12 +0100
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Organization: Guest of ProXad - France
NNTP-Posting-Date: 17 Dec 2002 14:03:34 MET
Winfield Hill a écrit dans le message :
> firstname.lastname@example.org wrote...
> > Well Now. Exuse me ... I'll answer my own question here.
> > Well Tony you could try a simple push pull transformer based
> > inverter design. Obviously silicon transistors are out of
> > the question so you would have to use germanium with there
> > lower 0.2 - 0.3 VBE voltage. ...
> Silicon transistors and MOSFETs have no problem switching low
> voltages, capable of stepping up even 10 to 20mV if need be.
> The issue with low supply voltages is operating the control
> circuit and driving the transistor bases or the FET gates.
> A common approach allowing you to use conventional circuitry
> is to operate the power stepup circuit from its output. Now
> the problem, of course, is how to get it started. A small
> starting battery is a simple solution. If that's distastful,
> this is a still a much simplified problem, because it's a
> low-current requirement, and poor efficiency is OK.
> A two-stage starting circuit can also be used. Let me give
> you a few interesting data points to whet your appetite: the
> required Vbe voltage for a 2n4401 npn transistor operating
> at 0.1uA is about 350mV, and for a 2n4403 pnp about 400mV,
> well under your cell's 0.5V. You see my drift here?
Hehe, already thought about that.
Another good point is -2.2mV/°C.
SOT23 are black, solar cells implies sun. One can add a small lens. Can you
see my drift here ?
Of course all that won't match for antartic use ;-)
> - Win
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