Archimedes' Lever said:I want a citation that switchers are commonly running at and above
1MHz.
NONE of ours did.
James said:That's exactly it. 400Hz power has been standard in aircraft for many
decades. Not only are the transformers smaller and lighter, but the
generators and motors too, and the filter capacitors in power supplies.
It's the reason switchmode power supplies run in the tens of kHz, and
some small ones are running as high as 1MHz. As the frequency increases,
switching losses in the semiconductors increase, but the size of the
energy storage components (inductors, transformers, capacitors)
decreases. A 60Hz transformer capable of supplying 300W might 15 lbs,
but a 20kHz transformer capable of the same power is less than a pound
and far more compact.
Archimedes' Lever said:Somehow my hand ended up between the poles of a 10kV Jacob's ladder on
day, while sitting indian style in front of it.
It shot me back about seven feet (my legs). I am sure I clamped the
supply down to near nothing, since it was only a 10mA furnace ignition
transformer.
That one was phase independent. Surprised I survived my youth as well.
I made a shock box "lie detector" as a science project, and was
shocking parents with it... mostly. Back then, a kid could get away
with that stuff.
The centralized system described will be drawing several amp-hours a
day just to keep the storage battery charged and it would have no
local control to actually save transformer idle consumption when
things are switched off or unplugged.
I've been told that when I was an infant crawling around the house
back in the middle of the last century, I unplugged the power cord
from the bottom of my mother's Singer sewing machine. The other end
of the cord was still plugged into the wall outlet and being the
curious little brat that I was, decided to determine what a power
cord tasted like. I've been told that I turned blue and my diaper
had to be changed. Ever since then I've been getting in trouble for
things I've done with electricity. When I was a bit older, I would
build Frankenstein like machines in the basement and being no fool,
I would get one of my little brothers to plug it in while I took
cover behind something. It made my butt hurt for some reason.
TDD
I want a citation that switchers are commonly running at and above
1MHz.
NONE of ours did.
I've never seen a switching power supply that ran at 1Mhz.
^^^^^^^^^^^^^^^^
Idiot. It is prejudice AGAINST AC.
It is a derogatory term, so there is no prejudice FOR anything.
"Still in use", and "Still being manufactured" are two different things,
dipshit. Show me a modern nameplate date. Case closed.
AlwaysWrong strikes again.
One example, at random: LTC3555 three buck regulators, each 2.25MHz.
http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1003,C1037,C1773,P37856
I'd be surprised if yours *worked*, DimBulb.
AlwaysWrong strikes again.
http://www.merriam-webster.com/dictionary/prejudice
Definition 2a: preconceived judgment or opinion
It has a negative connotation because it is preconceived, not because
what is preconceived is negative (or even AC).
Existed = have been. You said nothing about being manufactured,
DimBulb. You implied that they didn't exist.
krw said:They're really not uncommon today. LTC has a pile of 'em. Hint:
ignore DimBulb. You won't learn anything from him. He's AlwaysWrong
and dumber than even you are.
My statement still stands. I've never seen a switching regulator
that ran at 1Mhz. Just because the chip is capable of 1Mhz does
not mean that that is the switching speed of the regulator.
Most
of the design engineers I'm familiar with tend to be conservative.
Your opinion is not that important. Opinions are like tailpipes,
everyone has one, except for those like you who have theirs transposed
with their induction system. FLNF
Our power supply company survived after 911, a time when several
hundred other companies failed.
Those supplies were and are in a lot of the things you use because we
were OEMers for hundreds of companies as well.
You're an idiot, KeithTard.
Also, regardless of what the max frequency a regulator *can* operate
at, that does not mean that they get designed to operate there.
Folks engineer a supply on the bench, and the final most efficient
frequency a design runs at my not be the original estimation.
I would not expect you to get it though.
Idiot.
No... NONE of our units ran that fast. Magnetics tends to get
inefficient at passing power at too high a frequency. Our HV supplies
may have had switcher front ends, but they typically had a transformer
driven final feeding the multiplier stage. Most all were <100kHz.
A prejudice is usually something one has against something, not for it.
To be for something is to be "partial to" or "predispositioned for"
something.
Good thing that you are the only one that used the word. I never said
anything about "existed". Though it is a shame that you do.
krw said:Idiot. That is the switching speed of the regulator.
They don't have a choice, darling dufus. The regulator switches at
2.25MHz, whether they're conservative or commie.
My opinion may not be important to you, but my facts are at least
facts. I do this stuff for a living, you? Clean septic systems?
...with a mop?
I've never seen a switching power supply that ran at 1Mhz.
TDD
