| Author |
Message |
ZhangLu
Guest
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 Posted:
Wed Nov 09, 2005 1:35 am Post subject:
12V DC voltage stabilizer |
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I'm looking for a circuit diagram for 12V DC voltage stabilizer for my car.
I found that every time when I start my car, the starter motor will draw so
much current that cause the voltage over the ignition coil to drop
tremendously.
Most circuits I found need higher input voltage to produce a lower stable
voltage, but the only voltage source in a car is from the battery. So it's a
12V-12V DC voltage stabilizer that I'm looking for. Any recommendation?
Thanks,
Newbie
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Pooh Bear
Guest
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| Posted:
Wed Nov 09, 2005 9:35 am Post subject:
Re: 12V DC voltage stabilizer |
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ZhangLu wrote:
| Quote: | I'm looking for a circuit diagram for 12V DC voltage stabilizer for my car.
I found that every time when I start my car, the starter motor will draw so
much current that cause the voltage over the ignition coil to drop
tremendously.
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The battery needs replacing.
Graham |
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PeteS
Guest
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| Posted:
Wed Nov 09, 2005 4:19 pm Post subject:
Re: 12V DC voltage stabilizer |
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ISO 7637-1 (12V vehicles) specifies the voltage droops you may expect
to encounter during engine crank (amongst other things)
Although I agree with Graham your battery may need replacing, during
cranking the battery feed may droop to as low as 5V, then raise to
between 6V and 9.5V once the starter motor is running. Once the starter
motor is disengaged, things should recover to normal.
As the only feed during that time is the battery, you would need to
have a circuit that can take 5V ->14V in and produce your clean power
for whatever it is you are trying to operate. (Think SEPIC converter).
Cheers
PeteS
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Rich Grise
Guest
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| Posted:
Wed Nov 09, 2005 5:35 pm Post subject:
Re: 12V DC voltage stabilizer |
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On Wed, 09 Nov 2005 02:19:07 -0800, PeteS wrote:
| Quote: | ISO 7637-1 (12V vehicles) specifies the voltage droops you may expect
to encounter during engine crank (amongst other things)
Although I agree with Graham your battery may need replacing, during
cranking the battery feed may droop to as low as 5V, then raise to
between 6V and 9.5V once the starter motor is running. Once the starter
motor is disengaged, things should recover to normal.
As the only feed during that time is the battery, you would need to
have a circuit that can take 5V ->14V in and produce your clean power
for whatever it is you are trying to operate. (Think SEPIC converter).
|
Yeah, and the additional current drain on the battery will drag it down
even more.
Does the car not start reliably? They're generally engineered to take
all of those factors into account.
IOW, if it ain't broke, don't fix it. :-)
Good Luck!
Rich |
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ZhangLu
Guest
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| Posted:
Thu Nov 10, 2005 12:55 am Post subject:
Re: 12V DC voltage stabilizer |
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The battery is a new one. The car, it's an antique car, 1963 moris mini. I
find it hard to get started at times. Anyway, thanks for all the advice.
Regards,
Newbie
"Rich Grise" <rich@example.net> wrote in message
news:pan.2005.11.09.15.44.02.904136@example.net...
| Quote: | On Wed, 09 Nov 2005 02:19:07 -0800, PeteS wrote:
ISO 7637-1 (12V vehicles) specifies the voltage droops you may expect
to encounter during engine crank (amongst other things)
Although I agree with Graham your battery may need replacing, during
cranking the battery feed may droop to as low as 5V, then raise to
between 6V and 9.5V once the starter motor is running. Once the starter
motor is disengaged, things should recover to normal.
As the only feed during that time is the battery, you would need to
have a circuit that can take 5V ->14V in and produce your clean power
for whatever it is you are trying to operate. (Think SEPIC converter).
Yeah, and the additional current drain on the battery will drag it down
even more.
Does the car not start reliably? They're generally engineered to take
all of those factors into account.
IOW, if it ain't broke, don't fix it. :-)
Good Luck!
Rich
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ehsjr
Guest
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| Posted:
Thu Nov 10, 2005 1:35 am Post subject:
Re: 12V DC voltage stabilizer |
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ZhangLu wrote:
| Quote: | The battery is a new one. The car, it's an antique car, 1963 moris mini. I
find it hard to get started at times. Anyway, thanks for all the advice.
Regards,
Newbie
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Look for rust/corrosion on connections in the
coil circuit, particularly the grounding cable
from the battery to the engine block.
Ed |
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JeB
Guest
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| Posted:
Thu Nov 10, 2005 1:35 am Post subject:
Re: 12V DC voltage stabilizer |
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On Thu, 10 Nov 2005 02:55:01 +0800, "ZhangLu" <hechong@pc.jaring.my>
wrote:
| Quote: | The battery is a new one. The car, it's an antique car, 1963 moris mini. I
find it hard to get started at times. Anyway, thanks for all the advice.
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I might build or buy a Capacative Discharge Ignition for it ...
although those older Brit cars are famous for electrical problems. |
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Pooh Bear
Guest
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| Posted:
Thu Nov 10, 2005 1:35 am Post subject:
Re: 12V DC voltage stabilizer |
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ZhangLu wrote:
| Quote: | The battery is a new one. The car, it's an antique car, 1963 moris mini. I
find it hard to get started at times. Anyway, thanks for all the advice.
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Ahhh.
The battery in that may be slightly undersized by today's standards.
Graham |
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Rich Grise
Guest
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| Posted:
Thu Nov 10, 2005 8:19 am Post subject:
Re: 12V DC voltage stabilizer |
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On Thu, 10 Nov 2005 00:59:59 +0000, JeB wrote:
| Quote: | On Thu, 10 Nov 2005 02:55:01 +0800, "ZhangLu" <hechong@pc.jaring.my
The battery is a new one. The car, it's an antique car, 1963 moris mini. I
find it hard to get started at times. Anyway, thanks for all the advice.
I might build or buy a Capacative Discharge Ignition for it ...
although those older Brit cars are famous for electrical problems.
|
ANTIQUE????!?!?!??!?!!!! 1963??!?!?!??!??
Hey, that's when my family got our first convertible! A Ford Galaxie
500, in "Anniversary Gold", with a red top and red interior. That was
the one I learned to wreck cars in. ;-p
Anyhoo, I'm the one who said "If it ain't broke, don't fix it," but
since you've admitted it's a Brit car, here's what I'd do: First,
as someone else has posted, make sure you have very good electrical
contacts, both at the battery posts and at the lugs where the
cables bolt to the frame/engine block and to the starter or
solenoid. Clean them very aggressively with a wire brush, but
avoid chemicals. Don't grease them right away - bolt them up,
and grease them all around. I don't know what kind of battery
terminals you have, but I have had the kind with the vertical
lead posts, and the lead lugs that always get torn up when
people loosen them with pliers and stuff. Well, I got a post/
lug cleaner at the auto parts for about two bucks - it was
two very stiff wire brushes: one to go inside the lug, and
one to go around the post. I also got new cables, with new
leaden lugs, and stuck washers under the bolt head and nut
so I wouldn't tear up the lug when I had to loosen them.
Which, as it turns out, I didn't have to do very often. ;-)
Now, I have the kind with side terminals, and I just keep the
mating surfaces clean and shiny, and keep a 7MM wrench in its
own special place in the trunk. :-)
Good Luck!
Rich |
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Michael Gray
Guest
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| Posted:
Sat Nov 12, 2005 9:35 am Post subject:
Re: 12V DC voltage stabilizer |
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On Wed, 9 Nov 2005 03:51:05 +0800, "ZhangLu" <hechong@pc.jaring.my>
wrote:
| Quote: | I'm looking for a circuit diagram for 12V DC voltage stabilizer for my car.
I found that every time when I start my car, the starter motor will draw so
much current that cause the voltage over the ignition coil to drop
tremendously.
Most circuits I found need higher input voltage to produce a lower stable
voltage, but the only voltage source in a car is from the battery. So it's a
12V-12V DC voltage stabilizer that I'm looking for. Any recommendation?
Thanks,
Newbie
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Most older cars use a simple series resistor to the coil which is
shorted out when cranking.
Easy to implement and very reliable. |
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Michael Gray
Guest
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| Posted:
Mon Nov 14, 2005 9:35 am Post subject:
Re: 12V DC voltage stabilizer |
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On Thu, 10 Nov 2005 00:59:59 GMT, JeB <no@spam.org> wrote:
| Quote: | On Thu, 10 Nov 2005 02:55:01 +0800, "ZhangLu" <hechong@pc.jaring.my
wrote:
The battery is a new one. The car, it's an antique car, 1963 moris mini. I
find it hard to get started at times. Anyway, thanks for all the advice.
I might build or buy a Capacative Discharge Ignition for it ...
although those older Brit cars are famous for electrical problems.
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"Lucas", Prince of Darkness. |
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