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On Thursday 16 September 2004 03:13, Rob Syvertsen wrote:
> Not nearly impossible. It just requires a little more intelligence be
> put into the power supply.
Sure it can be done, but it is very uncommon. I seriously doubt that any
wall-wart (even very good ones) do it. I have a very high quality
wall-wart. It puts out 2A at 3 to 24V, is very stable at the whole range
from very little to full load and even on sharp load changes. But at no
load the voltage is still about 15% above the rated voltage.
> All the regulated power supplies my company
> produces contain a circuit called a down programmer. This circuits job
> is to discharge the filter capacitors and maintain the rated voltage
> under no-load conditions. It's essentially a fet or transistor run as
> a load across the output,
I guess those are special purpose power supplies that for some reason need
this feature, aren't they? Also they will draw a lot more current at no
load than a power supply without this down programmer.
The thing is that in almost all cases the higher voltage without load is
simply no problem. It is a good idea to connect the PS to your gadget
before plugging it in anyways, so it will have a load from the very
beginning.
Ulrich
--
PGP key ID: 0xDF6FC4FA
"A mouse is a device used to select the xterm you want to type in."
Author unknown
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Message is in Reply To:
 | | Re: RCX 2.0 Power Supply
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| (...) Not nearly impossible. It just requires a little more intelligence be put into the power supply. All the regulated power supplies my company produces contain a circuit called a down programmer. This circuits job is to discharge the filter (...) (20 years ago, 16-Sep-04, to lugnet.robotics, lugnet.trains)
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