Alt-BEAM Archive
Message #12420
To: "'beam@sgiblab.sgi.com'" beam@sgiblab.sgi.com
From: Wilf Rigter Wilf.Rigter@powertech.bc.ca
Date: Thu, 23 Mar 2000 19:31:49 -0800
Subject: [alt-beam] Re: A more efficient Solar PowerSmart Head
It is a good idea to cut power to the sensor bridge during charging for a
solar powered SP head. As shown below, enable the PS head with an active low
signal from an SE or voltage trigger connected to the 0V side of the
sensor bridge and on pin 1 - assuming you're use the 4 inverters with pins
2,4,6, and 8 as inputs for the SP head. This is the suggested solution also
shown in the PS head tutorial. You use the other half of the 240 for
something useful like motor drivers to buffer the PS head circuit from motor
noise.
<>
enjoy
wilf
> -----Original Message-----
> From: Justin [SMTP:JAF60@student.canterbury.ac.nz]
> Sent: Thursday, March 23, 2000 2:04 PM
> To: beam@corp.sgi.com
> Subject: A more efficient Solar PowerSmart Head
>
> Part of a solar walker I'm designing involves the PS Head. I was looking
> at two spare inverters on an HC240 that nothing would fit on (due to
> needing to be on when the SE-driven enable would be off), and realised I
> could use them on the PS Head. I think...
>
> Attached is the circuit showing what I thought off. I don't know enough
> to know if it will work, but the idea is that when the SE switches off,
> the inverters switch off, thus no matter how low the LDR resistance
> falls, you're not losing any power across them.
>
> So - whaddiya think? Would it work? Would it be better than not doing
> this, given that I'll have the inverters just sitting there doing
> nothing otherwise? << File: PSH-question.gif >>
Attachment: PSH-question.gif
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