Alt-BEAM Archive

Message #05328



To: "'beam@sgiblab.sgi.com'" beam@sgiblab.sgi.com
From: Wilf Rigter Wilf.Rigter@powertech.bc.ca
Date: Tue, 20 Jul 1999 18:34:42 -0700
Subject: [alt-beam] Re: Solar cell v. doubler



content-type: text/plain

Hi Don,

Try these circuits or variants.The charge pump current is proportional to
the output resistance when charging a capacitor. By ganging the outputs you
increase the current n fold. Using a separate inverter for the oscillator
makes the frequency and dutycycle independent of output loading, important
since a square wave is most efficient. This voltage doubler circuit is often
designed around a 555. Note the BiCore doubler is full wave and has lower
output resistance.
Untested so use at your own risk (but should work OK, and will be tested in
a few hours unless someone does it for me) (grin)


<> <>
enjoy

Wilf Rigter mailto:wilf.rigter@powertech.bc.ca
tel: (604)590-7493
fax: (604)590-3411

> -----Original Message-----
> From: Don Papp [SMTP:donp@cronus.oanet.com]
> Sent: Tuesday, July 20, 1999 12:46 PM
> To: beam@sgiblab.sgi.com
> Subject: Solar cell v. doubler
>
>
> I know I intimated I wouldn't be working on the design any more,
> but I did a bit of timkering.
>
> I got better results with a 10K resistor for the oscillator (not
> 100K). Also, the 0.047F cap only seems to charge to about 3.x volts on
> its own, though I measure 6+ volts at the output. Clearly more work is
> needed. I'll try with different solar cells, too. Maybe I just need
> a
> cell that provides more current. Wish I had an o-scope.
>
> Anyway, if anyone is just joining this, you can see the simple cct
> at http://diehumans.anubis.ab.ca/proj/vdoubler/vdoubler.gif
>
> R1 should be 10K, and not 100K as the schematic shows. If
> anyone tries something similar, I'd be interested in hearing about
> it.
>
> | Donald Papp
> | don@oa.net
>


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Attachment: chargepump.gif


Attachment: BiPump.gif

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