Morning Wayne,
Yep, I get the picture, although I get none of the picture after the first
sentence, (sorry, but can't stop laughing as you would know by now that my
knowledge of electronics is...zilch! and the joke's on me I'm afraid, not
you). I'm beginning to wonder what you guys must be thinking you have
struck here, (still laughing). But yes, I see where you are going. It's
about LOAD.......Jeez, I'm trying to find an analogy myself now and can't
think of one, but I do know what you are alluding to regarding load. I
don't savvy the electronics of it but I do know that motors etc have a
'load' capacity or rating or however it's described. Yep yep. Don't take
offence Wayne but I know so little about this that it's not funny. You must
be wondering how the hell I have lived this long if I am dabbling in
electronics.
Neville.
----- Original Message -----
From: "Wayne Fugitt" <[email protected]>
To: <[email protected]>
Sent: Tuesday, September 02, 2008 8:24 PM
Subject: CS>Power Supply Characteristics
Morning Neville,
At 11:15 PM 9/1/2008, you wrote:
Here's something I find curious...when I connect a multimeter to the
electrodes on my 24V mains power unit I get a reading of 30V...???? How
can this be so? Why doesn't it read 24V as stated on the power adaptor?
If it's complicated and/or lengthy at all, don't worry about it for now.
I have to worry about it. You and likely others need to know.
Power Supplies come in all qualities, types, some good, some poor, and
some better.
What you are talking about is Per Cent Regulation.
( an old and historical feature, quality, or curse of power supplies )
To understand it, to some degree,
This is the Voltage under Full Load
Compared to
The Voltage under NO LOAD.
For some applications, this is very critical, for others it is not so
critical.
One should know this when he embarks on the power supply journey. or else
......... ! !
Most of us know about the older power supplies that consisted of only a
transformer,
rectifier ( many types ) capacitors, and maybe a resistor or two.
I never liked Half Wave, I always liked Full Wave rectifiers.
Later, with the event of new technology. transistors, regulators, many
integrated circuits, and on and on, Switching Power Supplies, ( and
other types ) began to make the scene.
Then, ........ along came UL listed power supplies. Some of the very
best, and high dollar power supplies we use today are in fact, UL listed.
These are used in Life Safety applications.
Not exactly a place to monkey around, of for a dumb old redneck to build
power supplies.
I have one power supply in my shop, I designed and built.
It is 12 VDC and 100 AMPS.
Large high quality heat sinks
Fans
Partitions to control the air flow ( the idea was for it not to Self
Destruct )
Next I have to build a device to load test it. Do that right or it will
not last thru ONE TEST.
Large Wire Wound Resistors that run RED HOT ! Simple math says, 1200
Watts. Minimum
Place a steel plate on top, boil coffee, fry eggs, or bake bread with some
modification.
Another thing I must mention that is in order, is that............
High Speed Fuses are very different from ordinary fuses. They have to be
fast enough to protect the solid state devices. And they are not CHEAP.
For a few years, I was the field service rep for Chloride Systems, Emergy
Lite, Computer Power, and Hunt Electronics. Almost forgot, Lighting
Services, a large northern company I did work for in
MS, LA, AL, and GA. Nothing to it, ........ all in a days work.
A few times, I had to buy $ 200.00 worth of fuses before I did a service
Call.
Of course many were 100 amp and 200 amp high speed fuses.
Every circuit, needs at least one fuse. Always, .............
480 / Three Phase Inverter systems, with about a TON of Batteries,
........ is in fact a power supply of sorts. Two large battery cabinets, 4
feet tall, and 40 feet long.
Most of these have a "Low Battery Cut Off". It works so fast, you will
not know it functioned.
The Inverter will not work,......... and you scratch your head for a
while, one minute or two, maybe more. <grin>
And I do not claim to know all about power supplies, ....... just a
little, maybe.
Wayne
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