[mythtv-users] Desk Top Power

[Daryl McDonald]

On May 16, 2015 1:57 PM, "Stephen P. Villano" <stephen.p.villano at gmail.com>
wrote:
>
>
>
> On 5/16/15 12:59 PM, Simon Hobson wrote:
> > Michael Watson <michael at thewatsonfamily.id.au> wrote:
> > jrh <jharbestonus at gmail.com> wrote:
> >
> >> Regarding power imbalance or however it is called, is this still an
issue for power supplies built today?
> > Yes I would say for a typical PC PSU.
> > The multiple outputs typically come from multiple secondary windings
and rectifiers from one transformer. The feedback control operates on the
primary output - it's only possible to accurately regulate one output
without secondary regulators. The other rails will more or less follow the
main one - the relationship between output voltages depends on the ratio of
the number of turns on the transformer, and the voltage drop in the
rectifier diodes and windings.
> > If you keep the load on the primary output constant, then varying the
load on one of the secondary outputs will vary the voltage on that output -
increase load and the voltage will droop, reduce it and the voltage will
rise.
> >
> PC power supplies have long been switched mode power supplies, with a
> "chopper" duty cycle being controlled by output voltage of the various
> outputs.
> Many have multiple "chopper" circuits, in order to follow the demands of
> the various outputs, such as the 5 volt and 12 volt lines. They're
> literally independent power supplies within one box.
> The end result of insufficient loading can be nothing or one can end up
> with a bad odor and "popcorn" from blown electrolytic capacitors,
> depending upon the design of the power supply. Some can handle no-load
> conditions, some cannot.
>
> As for whole house distribution, that is a non-starter due to resistive
> losses in long wire runs. An intermediate voltage run might be feasible,
> but one would be more fiscally responsible by leaving mains voltage to
> each room and place higher demand capable power supplies in multiple
rooms.
> Otherwise, you'd be slinging large gauge cables around, just to lower
> resistive losses from the wires (larger gauges tend to have lower losses
> than small gauges).
>
> Tesla and Edison had a longstanding argument, Tesla advocated for
> alternating current, Edison advocated for direct current. As alternating
> current has less losses in long transmission lines than direct current,
> Tesla's argument won by means of feasibility.
>
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Would a small solar array, with battery charging and storage fit the single
room senario?
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