From: William Levak (wlevak_at_cyberspace.org)
Date: 2004-01-20 04:15:30
>> 2) If your 900 expects 50 Herz current, the 60 Herz current
>> may confuse the controller in the swithcing power supply.
>No, the first thing a switching PS does is rectifying the incoming power.
>Then the resulting DC is sent to a trafo through a transistor. This
>transistor is switch on/off at a very high frequency (??? KHz) thus
>generating the needed AC where a trafo can work with.
>According the above you can see that it makes no difference wether the
>input is 50 or 60 Hz.
A switching power supply controls it's power output by varying the ratio
of on to off time. If the controller is expecting 50 Hz, and you are
using 60 Hz, that ration may not be correct. Although the input is
rectified and chopped at a high frequency, it is not smoothed. The
amplitude still varies at the input frequency.
>> By the way, most Amarican homes have 220V available at the
>> fuse box. .....
>> ..... A quick cheap fix is to use the hot lines from two
>> different 110V circuits that are on opposite phases.
>Ehhh, that only makes 190V IMHO. But I have some PS's that work in the
>range 180-260V so maybe there is a chance the C900's accepts it as well.
No, the phases are exactly opposite, so it's 220 V peak to peak. Two
phases out of a three phase system would give you 207 V, if I remember
correctly.
>Another possebility: Most PC PS's have a switch that enables one to
>choose between 220V and 110V.
It just switches the center tap on the input transformer.
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