nuckolls.bob(at)aeroelect
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 Posted: Sun Sep 17, 2023 10:10 am Post subject: New kid on the block in automatic chargers |
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At 07:09 AM 9/17/2023, you wrote:
| Quote: | --> AeroElectric-List message posted by: "racerjerry" <gnking2(at)verizon.net>
My favorite trick for limiting the charging rate on small motorcycle type lead-acid batteries is to connect the charger in series with an old automotive ignition coil ballast resistor. These resistors were used long ago before fuel injection and electronic ignition became commonplace; but I see that they are still available as an aftermarket item. |
Yeah, those popped up in early days of transition
from 6 to 12 volt cars. The resistor offered a way
to run 6v coils in 12v cars. Further, by adding an
extra contact inside the starter contact, this resistor
could be shorted out during cranking to improve
spark intensity during the cranking 'brownout'.
An additional benefit of added resistor was
to decrease charging time for magnetizing the ignition
coil. The time constant for an LR circuit is
L
t = -------
Rc + Rb
L is the primary inductance (constant)
Rc is resistance of coil primary winding
Rb is resistance of the ballast resistor
In the 'run' condition, Rb is in operation
which halves the rise time of current in
the primary coil after points close.
Bob . . .
////
(o o)
===========o00o=(_)=o00o=========
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In the interest of creative evolution
of the-best-we-know-how-to-do based
on physics and good practice.
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