ups for 3b1
Daniel R. Levy
levy at cbnewsc.ATT.COM
Wed Mar 28 19:28:34 AEST 1990
In article <3005 at umbc3.UMBC.EDU>, motteler at umbc3.UMBC.EDU (Howard E. Motteler) writes:
>
> Does anyone know how the 3b1 power supply holds up when fed the square
> wave output typical of most UPS's? I know this causes a problem for
> some switching power supplies.
The 3B1 power supply input is a voltage doubler / brute force capacitive filter
circuit. The switching circuit doesn't see but a few volts of ripple.
The peak to peak value of the input waveform is what matters; so long as the
p-p value of the UPS output approximates that of a 120v (RMS) AC sinewave
(i.e., about 320v p-p) it ought to work OK.
--
Daniel R. Levy >>> God: just say "yes" <<<
AT&T Bell Laboratories UNIX(R) mail: att!ttbcad!levy, att!cbnewsc!levy
5555 West Touhy Avenue Any opinions expressed in the message above are
Skokie, Illinois 60077 mine, and not necessarily AT&T's.
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