Diodes for 12v battery charging

[ian field]

"Stumpy" <perilmung@spamnet.con> wrote in message
news:tIOdnVYYR9lka_vWnZ2dnUVZ_uidnZ2d@earthlink.com...

The higher the current rating of the Schottky diode, the lower will be
the voltage drop at a certain current. Here is a diagram of a typical
200W computer supply:
http://www.pavouk.org/hw/en_atxps.html

The output rectifier is a D83-004 which is rated at 30A. At 6A, or 3A
through each in parallel, the voltage drop is just about 0.35V.
http://pdf1.alldatasheet.com/datasheet-pdf/view/61331/FUJI/ESAD83-004.html

So it might be worthwhile to take apart some junk computer PSUs to get
these diodes. However, you can get an MBR4060 from Mouser for $2.60 each.
Dual 40A 60V.

Another idea to try is a set of three relays which take turns connecting
the regulator to each of the three batteries. And you can add a small
diode and resistor across each contact so that bateries not directly
connected will still get a trickle charge. At least in this way the
charger/controller will be able to interact with the battery in the way
it was designed.

Paul

Those relays sound like a fun project, but too sophisticated for me.
Where do you guys post diagrams of your circuits? If Sci. E. B. is text
only is there a companion group for binaries?

News:alt.binaries.schematics.electronic

 

[Stumpy]

I'll bet the relay project is something you could tackle,
with a little help.

Regarding schematics, there are a number of possibilities:
http://tinypic.com/
Spice lists
a.b.s.e (alt.binaries.schematics.electronic)
ASCII art

For example here's ascii art showing the diode isolation you
mentioned:

------------
| Solar +|------+--->|---[Battery1]---+
| Controller | | |
| | +--->|---[Battery2]---+
| Harbor | | |
| Freight | +--->|---[Battery3]---+
| Model (?) | |
| -|----------------------------+
------------

Each approach has its pluses and minuses. For example
the ACSII art above must be viewed in fixed font such as
Courier.

Ed

Thanks, I'm going to try posting on A.B.S.E. with the same heading. It will
just show up as a lame sketch without any explanation. How do you link
posts without crossposting?

 

[George Herold]

On Feb 1, 10:50 am, "Stumpy" <perilm...@spamnet.con> wrote:

The higher the current rating of the Schottky diode, the lower will be the
voltage drop at a certain current. Here is a diagram of a typical 200W
computer supply:
http://www.pavouk.org/hw/en_atxps.html

The output rectifier is a D83-004 which is rated at 30A. At 6A, or 3A
through each in parallel, the voltage drop is just about 0.35V.
http://pdf1.alldatasheet.com/datasheet-pdf/view/61331/FUJI/ESAD83-004...

So it might be worthwhile to take apart some junk computer PSUs to get
these diodes. However, you can get an MBR4060 from Mouser for $2.60 each.
Dual 40A 60V.

Another idea to try is a set of three relays which take turns connecting
the regulator to each of the three batteries. And you can add a small
diode and resistor across each contact so that bateries not directly
connected will still get a trickle charge. At least in this way the
charger/controller will be able to interact with the battery in the way it
was designed.

Paul

Those relays sound like a fun project, but too sophisticated for me.  Where
do you guys post diagrams of your circuits?  If  Sci. E. B. is text only is
there a companion group for binaries?- Hide quoted text -

- Show quoted text -

You can put your pictures/schematic up on some 'picture host', (I'm
not sure what the right word is.)and post the link here.

George H.