[amsat-bb] Re: Future radical satellite designs
rhyolite at nettally.com
Mon Jul 9 09:54:10 PDT 2007
The difference in my proposal is that instead of a series string, each
solar cell/battery assembly have its own boost convertor/regulator to
charge a common bus to a higher operating voltage. That way, a failure
or depletion a small number of batteries will affect only the available
bus current, not the bus voltage.
Robert Bruninga wrote:
>>Why not construct clusters of low voltage
>>batteries each with their own set of solar
>>cells. ... The solar cells could then be placed
>>on all sides of the spacecraft and
>>charge their associated batteries at will...
>Yes, this was our design back in the mid 90's for a tiny
>softball sized satellite. A single NiCd per side with a magnet
>for tumble and radiative B/W paint for spin to assure even
>illumination. Each cell was charged by itself, and the series
>string was used to power the spacecraft (6 times 1.2v) to give a
>nice 7.2/8.4v bus.
>It solves the number one problem of spaceccraft batteries, that
>is, charging and discharging in series. Also, no inefficiences
>of boost inverters.. Penalty was that cells had to have larger
>capacities because each one would see less charge time.
Joe Leikhim K4SAT
"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."
"Follow The Money" ;-P
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