"Brian Whatcott" wrote in message
...


Hmmm...these days, there are boost regulators (step up) and buck
regulators (step down) and even buck/boost regulators, that can
produce a set voltage from a source that goes from higher to lower
than the target voltage.
And this leads to high efficiencies too.
I imagine an inverter system could have similar qualities.

Brian Whatcott Altus OK

I've never heard of a buck, boost, or buck/boost regulator. There are
bucking, boosting and buck/boost transformers, but if the voltage is
boosted, it is at the expense of a corresponding same percentage loss of
available current, plus transformer loss.

Eisboch

"Eisboch" wrote in message
...

I've never heard of a buck, boost, or buck/boost regulator.

Now you have:

http://www.national.com/pf/LM/LM2698.html




There are
bucking, boosting and buck/boost transformers,

No transformer in the above link.

but if the voltage is
boosted, it is at the expense of a corresponding same percentage loss of
available current, plus transformer loss.

Only applies to transformers. Power (voltage and current over a given time
period) is conserved.



Eisboch

"Steve" wrote in message
...

"Eisboch" wrote in message
...

I've never heard of a buck, boost, or buck/boost regulator.

Now you have:

http://www.national.com/pf/LM/LM2698.html




There are
bucking, boosting and buck/boost transformers,

No transformer in the above link.

but if the voltage is
boosted, it is at the expense of a corresponding same percentage loss of
available current, plus transformer loss.

Only applies to transformers. Power (voltage and current over a given time
period) is conserved.



Eisboch



Interesting. If the power source is a 12 volt DC battery, what does this
regulator boost and how does it do it?

Eisboch

"Eisboch" wrote in message
...

"Steve" wrote in message
...


I've never heard of a buck, boost, or buck/boost regulator.

Now you have:

http://www.national.com/pf/LM/LM2698.html




There are
bucking, boosting and buck/boost transformers,

No transformer in the above link.

but if the voltage is
boosted, it is at the expense of a corresponding same percentage loss of
available current, plus transformer loss.

Only applies to transformers. Power (voltage and current over a given
time period) is conserved.



Eisboch



Interesting. If the power source is a 12 volt DC battery, what does this
regulator boost and how does it do it?

Eisboch


My apologies. I didn't notice the link you provided.
It appears to be an inverter circuit and indeed can provide a DC boost.
However, it's not a perpetual power system and will still use more power
from a battery that it is trying to charge.

Eisboch

"Eisboch" wrote in message
...

"Eisboch" wrote in message
...

"Steve" wrote in message
...


I've never heard of a buck, boost, or buck/boost regulator.

Now you have:

http://www.national.com/pf/LM/LM2698.html




There are
bucking, boosting and buck/boost transformers,

No transformer in the above link.

but if the voltage is
boosted, it is at the expense of a corresponding same percentage loss
of available current, plus transformer loss.

Only applies to transformers. Power (voltage and current over a given
time period) is conserved.



Eisboch



Interesting. If the power source is a 12 volt DC battery, what does this
regulator boost and how does it do it?

Eisboch


My apologies. I didn't notice the link you provided.
It appears to be an inverter circuit and indeed can provide a DC boost.
However, it's not a perpetual power system and will still use more power
from a battery that it is trying to charge.

Eisboch


DC-DC converter. I see there are references to Buck Regulators on the
I-net. But Buck just means reducing voltage.

On Fri, 23 Nov 2007 00:15:42 -0500, "Eisboch" wrote:


"Brian Whatcott" wrote in message
.. .


Hmmm...these days, there are boost regulators (step up) and buck
regulators (step down) and even buck/boost regulators, that can
produce a set voltage from a source that goes from higher to lower
than the target voltage.
And this leads to high efficiencies too.
I imagine an inverter system could have similar qualities.

Brian Whatcott Altus OK

I've never heard of a buck, boost, or buck/boost regulator. There are
bucking, boosting and buck/boost transformers, but if the voltage is
boosted, it is at the expense of a corresponding same percentage loss of
available current, plus transformer loss.

Eisboch


Yep, there are many many topics that *I've* never heard of either!
As usual, Google is your friend - with keywords: buck/boost
regulator.
Here's an old article that gives the flavor....
http://www.edn.com/article/CA318719.html

And, it goes without saying, you don't get more power out than the
power you put in, but you don't throw away power as heat so much
as older methods, so the volt times amp product of the output can be
85% or 90% of the volt amps input over a fair voltage input range.

Brian Whatcott Altus OK

Brian Whatcott Altus OK