Re: Magic Capacitor on car.
From: John Popelish (jpopelish_at_rica.net)
Date: 07/05/04
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Date: Mon, 05 Jul 2004 11:19:12 -0400
71@7117.com wrote:
>
> Not only my experience,I work in automobile/electronic field and this box
> is not convinciable to me at first.
> Besides the effect of this small box,
> What I'm asking now is the theory behind of these cap.,
> how come they suggest to connecte a cap to the battery?
>
> What I found out from automobile circuit is that the coil positive terminal
> is connect to the battery positive, the negative of the coil is connect to a
> switching circuit which switching the coil to ground.
> If connect a cap across the battery, what is the circuit becomes?
> I just thinking about this and please reply with ONLY technical commects.
A battery is essentially a voltage source in series with a small
resistance. In an automobile, this is paralleled by all the operating
loads and the charging system. The charging system includes active
regulation that increases the charging current as the voltage falls,
and decreases it as the voltage rises. It takes a bit of time for the
regulation to work, so this part looks most like a voltage source in
series with an inductance.
When the ignition switching circuit (points or electronic switch)
opens, there is a small rise in battery system voltage that the switch
has to deal with, in addition to the average voltage. At first
glance, one might think that this small ripple voltage might make the
switch's job harder to do, But the ignition coil produces a couple
hundreds of volts at that same instant, so the fraction of a volt of
rise in the battery system is extremely insignificant. Paralleling
the battery with a capacitor would slightly reduce the instantaneous
ripple voltage at the battery but I see no way this could functionally
alter the operation of the ignition system.
I suggest you perform an experiment. Connect a large capacitor to
your battery, except that you add a series switch (so that the
capacitor can be connected or disconnected very easily). Parallel the
switch with a resistor of say, 1k ohms, to precharge the cap to
battery voltage so the switch contacts to not weld. That will
effective isolate the cap when the switch is open, as far as any
voltage stiffening goes.
You (the driver) go out of sight of the car, and have a friend toss a
coin and position the switch based on the toss (say, heads = close the
switch). Then they write down the value of the toss and close the
hood and call you out. You take the car for a test ride and decide if
you think the switch is closed or open and record your result.
Repeat this test at least a dozen times. Then compare your judgments
with your friends record or switch positions. If there is a good
correlation (say, 90% matches) between your judgments and his record,
we might have a real effect to unravel. (Or your friend is
inadvertently communicating his actions to you. This is, after all,
only a single blind test.) I won't hold my breath.
-- John Popelish
- Next message: Julius Junghans: "Re: forward converter, higher Bmax through gap?"
- Previous message: Tim Shoppa: "Re: Reverse-Sense TNC Connector"
- Maybe in reply to: John Popelish: "Re: Magic Capacitor on car."
- Next in thread: Ben Bradley: "Re: Magic Capacitor on car."
- Messages sorted by: [ date ] [ thread ]
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