On Jul 9, 9:26=A0pm, emailaddr...@[EMAIL PROTECTED]
wrote:
> I have an application in which I need to determine if a transformer is
> suitable.
> Perhaps a little more info about the project is in order. =A0Following
> the transformer there'll be a bridge rectifier, smoothing cap... then
> a linear regulator suppling constant current to charge batteries. =A0The
> circuit is a bit more involved than only this (protection diodes,
> charge controller, etc) but this is the subsection in question and the
> rectified output of the transformer will need to stay above roughly
> 12.3VDC so I'm trying to figure out what constant current this
> transformer (or others) can supply. =A0
Another thing I am wondering is if a basic, typical small brick AC-DC
switching supply is stable powering this kind of load. Stripping down
the circuit to the basic topology, what if it had for example:
AC-DC SMPS -> LM317 -> 1.25 Ohm resistor (LM317 in current regulating
config) -> 1A into Battery Pack + LM317 feedback
Since the SMPS is trying to regulate to it's spec'd voltage, let's say
that is 13V even if an uncommon value, will it run stable doing so and
if so, is that at the same constant output wattage from the SMPS the
whole time, with the linear regulator simply dropping more voltage,
creating more heat at the beginning of a battery recharge cycle since
it's suppling constant current to batteries that are at a lower
initial, low state-of-charge voltage?
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