Re: 12 volt power source?

Ray Haddad wrote:

On Mon, 24 Dec 2007 12:52:52 +0100, I said, "Pick a card, any card"
and "Klaus D. Mikkelsen" <er.du.saa.klog@xxxxxxxxxxxxxxxx> instead
replied:


Ray Haddad skriver:

Not at all.

Okay


Go back and read what I wrote.

I still read it as I understood it. Can you rephrase ?


Sure.

When a car is started, the battery supplies voltage for turning over
the engine and also to the stator coils on the alternator. It does
this via the voltage regulator on a car, not to be confused with the
kind of regulator we've been discussing on a DC power supply. Once
the engine is running, the voltage regulator does other things.

In a car, when the alternator is supplying 13.8 volts, that is what
is supplied to the lights, radio and so forth. The battery is a
reserve power source, trickle charging merrily and supplying the
stator voltage to the alternator.

Nope, the 'stator' current comes from whatever is available. Witness the FACT, that once a car is started, IF the RPM of the engine is high enough, the 'Battery' may be removed --- WITHOUT killing the engine.

> As long as the alternator is
working, the battery is not being used for more than the stator
windings. If the belt should break, as it has on a few occasions
worldwide, the battery will power the car for a short while.

Depending on the car, hours to days.

In a car, the voltage regulator keeps the current flow from the
source of the highest capacity. That's another reason for the 13.8
volts of the charge circuit versus the 12 volts of a battery. As
long as the charge voltage is adequate, the regulator uses that to
power all the auto accessories and lights.

Just where is this 'Magical Switch' circuitry or relay. there isn't anything like this available in any of the 'Voltage Regulator' circuits that I have ever worked with.
Chuck D.

--
Ray
.

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