## Re: [Electronics_101] Lithium Batteries.

Expand Messages
• ... I think what was trying to be said there was that both need to be _limited_...
Message 1 of 21 , May 2, 2005
On Monday 02 May 2005 05:27 pm, JanRwl@... wrote:
> In a message dated 5/2/2005 2:23:44 A.M. Central Daylight Time,
> logicresearch@... writes:
>
> how can I get a constant 12v
> current.
>
>
>
> Daryl: "current" is Amps and "12v" is a VOLTAGE. This matter is very
> confused! Hey, Experts: Are you telling him he needs constant CURRENT or
> constant VOLTAGE? Because they cannot BOTH be "constant" as the cells
> charge!!!!!!!!!!!!

I think what was trying to be said there was that both need to be _limited_...
• ... well, yes, actually both. First constant current and then constant voltage ;-) (This charge mode is really called CC/CV, no shit). It is really a current
Message 2 of 21 , May 2, 2005
On Mon, 2 May 2005 17:27:28 EDT, <JanRwl@...> wrote:

>
> Daryl: "current" is Amps and "12v" is a VOLTAGE. This matter is very
> confused! Hey, Experts: Are you telling him he needs constant CURRENT
> or constant VOLTAGE? Because they cannot BOTH be "constant" as the
> cells charge!!!!!!!!!!!!

well, yes, actually both.
First constant current and then constant voltage ;-)
(This charge mode is really called CC/CV, no shit).

It is really a current limit and voltage limit, whichever is lower is
determining.

ST
• See page 19 of http://www.national.com/ds/LM/LM117.pdf LM317 Norm ... From: Stefan Trethan To:
Message 3 of 21 , May 2, 2005
See page 19 of http://www.national.com/ds/LM/LM117.pdf LM317

Norm

----- Original Message -----
From: "Stefan Trethan" <stefan_trethan@...>
To: <Electronics_101@yahoogroups.com>
Sent: Monday, May 02, 2005 4:41 PM
Subject: Re: [Electronics_101] Lithium Batteries.

> On Mon, 2 May 2005 17:27:28 EDT, <JanRwl@...> wrote:
>
>>
>> Daryl: "current" is Amps and "12v" is a VOLTAGE. This matter is very
>> confused! Hey, Experts: Are you telling him he needs constant CURRENT
>> or constant VOLTAGE? Because they cannot BOTH be "constant" as the
>> cells charge!!!!!!!!!!!!
>
>
> well, yes, actually both.
> First constant current and then constant voltage ;-)
> (This charge mode is really called CC/CV, no shit).
>
> It is really a current limit and voltage limit, whichever is lower is
> determining.
>
> ST
>
>
>
>
>
>
• Sweeeeet, ok that s easy enough now - next part is - what should I limit the current too and is 9.0V right or should the charging voltage be a little higher
Message 4 of 21 , May 2, 2005
Sweeeeet,

ok that's easy enough now - next part is - "what should I limit the current
too and is 9.0V right or should the charging voltage be a little higher such
as 9.3V.

I'm using 3 of 400 mAh 3V PCB mounted cells in series ( not 4 as I may have
mentioned) - the circuit doesn't mind what voltage it runs at.

By the way, thanks for the help.

Daryl.

----- Original Message -----
From: "Stefan Trethan" <stefan_trethan@...>
To: <Electronics_101@yahoogroups.com>
Sent: Tuesday, May 03, 2005 9:41 AM
Subject: Re: [Electronics_101] Lithium Batteries.

> On Mon, 2 May 2005 17:27:28 EDT, <JanRwl@...> wrote:
>
>>
>> Daryl: "current" is Amps and "12v" is a VOLTAGE. This matter is very
>> confused! Hey, Experts: Are you telling him he needs constant CURRENT
>> or constant VOLTAGE? Because they cannot BOTH be "constant" as the
>> cells charge!!!!!!!!!!!!
>
>
> well, yes, actually both.
> First constant current and then constant voltage ;-)
> (This charge mode is really called CC/CV, no shit).
>
> It is really a current limit and voltage limit, whichever is lower is
> determining.
>
> ST
>
>
>
>
>
>
>
>
>
>
>
>
• Thanks Norm, I like the simple one on the bottom of page 17 - space wise for my project. The 117 will set me back nearly \$55 so it s a no-go. Do you think the
Message 5 of 21 , May 2, 2005
Thanks Norm,

I like the simple one on the bottom of page 17 - space wise for my project.

The 117 will set me back nearly \$55 so it's a no-go.

Do you think the 317 would do the same thing?

Daryl.

----- Original Message -----
From: "Norm Carlberg" <normnet@...>
To: <Electronics_101@yahoogroups.com>
Sent: Tuesday, May 03, 2005 10:17 AM
Subject: Re: [Electronics_101] Lithium Batteries.

> See page 19 of http://www.national.com/ds/LM/LM117.pdf LM317
>
> Norm
>
> ----- Original Message -----
> From: "Stefan Trethan" <stefan_trethan@...>
> To: <Electronics_101@yahoogroups.com>
> Sent: Monday, May 02, 2005 4:41 PM
> Subject: Re: [Electronics_101] Lithium Batteries.
>
>
>> On Mon, 2 May 2005 17:27:28 EDT, <JanRwl@...> wrote:
>>
>>>
>>> Daryl: "current" is Amps and "12v" is a VOLTAGE. This matter is very
>>> confused! Hey, Experts: Are you telling him he needs constant CURRENT
>>> or constant VOLTAGE? Because they cannot BOTH be "constant" as the
>>> cells charge!!!!!!!!!!!!
>>
>>
>> well, yes, actually both.
>> First constant current and then constant voltage ;-)
>> (This charge mode is really called CC/CV, no shit).
>>
>> It is really a current limit and voltage limit, whichever is lower is
>> determining.
>>
>> ST
>>
>>
>>
>>
>>
>>
>
>
>
>
>
>
>
>
>
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>
>
>
• On Tue, 03 May 2005 14:37:27 +1200, Daryl Mills ... You must use the literature here. the voltage must be very precise for lithium batteries, and the current
Message 6 of 21 , May 2, 2005
On Tue, 03 May 2005 14:37:27 +1200, Daryl Mills
<logicresearch@...> wrote:

> Sweeeeet,
> ok that's easy enough now - next part is - "what should I limit the
> current
> too and is 9.0V right or should the charging voltage be a little higher
> such
> as 9.3V.
> I'm using 3 of 400 mAh 3V PCB mounted cells in series ( not 4 as I may
> have
> mentioned) - the circuit doesn't mind what voltage it runs at.
> By the way, thanks for the help.
> Daryl.

You must use the literature here. the voltage must be very precise for
lithium batteries, and the current must be matched to the battery. Look in

ST
• Here you can find a simple schematic for a charger with limited current and voltage. http://shdesigns.org/lionchg.html Bye. Giuliano ... From: Daryl Mills To:
Message 7 of 21 , May 3, 2005
Here you can find a simple schematic for a charger with
limited current and voltage.

Bye.
Giuliano
----- Original Message -----
Sent: Tuesday, May 03, 2005 5:26 AM
Subject: Re: [Electronics_101] Lithium Batteries.

Thanks Norm,

I like the simple one on the bottom of page 17 - space wise for my project.

The 117 will set me back nearly \$55 so it's a no-go.

Do you think the 317 would do the same thing?

Daryl.

----- Original Message -----
From: "Norm Carlberg" <normnet@...>
To: <Electronics_101@yahoogroups.com>
Sent: Tuesday, May 03, 2005 10:17 AM
Subject: Re: [Electronics_101] Lithium Batteries.

> See page 19 of    http://www.national.com/ds/LM/LM117.pdf     LM317
>
> Norm
>
> ----- Original Message -----
> From: "Stefan Trethan" <stefan_trethan@...>
> To: <Electronics_101@yahoogroups.com>
> Sent: Monday, May 02, 2005 4:41 PM
> Subject: Re: [Electronics_101] Lithium Batteries.
>
>
>> On Mon, 2 May 2005 17:27:28 EDT, <JanRwl@...> wrote:
>>
>>>
>>> Daryl:  "current" is Amps and "12v" is a VOLTAGE.  This matter is very
>>> confused!  Hey, Experts:  Are you telling him he needs constant CURRENT
>>> or constant VOLTAGE?  Because they cannot BOTH be "constant" as the
>>> cells charge!!!!!!!!!!!!
>>
>>
>> well, yes, actually both.
>> First constant current and then constant voltage ;-)
>> (This charge mode is really called CC/CV, no shit).
>>
>> It is really a current limit and voltage limit, whichever is lower is
>> determining.
>>
>> ST
>>
>>
>>
>>
>>
>>
>
>
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>
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>

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• Look here http://www.myra-simon.com/bike/charger.html. Bye ... From: Roy J. Tellason To: Electronics_101@yahoogroups.com Sent: Monday, May 02, 2005 9:56 PM
Message 8 of 21 , May 3, 2005
Bye
----- Original Message -----
Sent: Monday, May 02, 2005 9:56 PM
Subject: Re: [Electronics_101] Lithium Batteries.

On Monday 02 May 2005 04:01 am, Stefan Trethan wrote:

> I was thinking along a 1 IC regulator, i can't find the page but
> <http://users.cybercity.dk/~ccc16084/lipo.htm>
> is very similar.

What is that chip used in there?  The number doesn't sound familiar to me...

• ... Now THAT is the one i was looking for. I knew it was out there... Wouldn t it be great to have a option in google only pages which i have seen before
Message 9 of 21 , May 3, 2005
On Tue, 3 May 2005 10:38:07 +0200, Giuliani <julcat@...> wrote:

> Here you can find a simple schematic for a charger with limited current
> and voltage. http://shdesigns.org/lionchg.html Bye.Giuliano

Now THAT is the one i was looking for.
I knew it was out there...

Wouldn't it be great to have a option in google "only pages which i have
seen before" that remembers where you have been, forever?
(Oh well, but then, i guess it could be a serious privacy issue ;-) )

ST
• Have you looked at the LM317 adjustable voltage regulator? It can be wired for current regulation. See National Semiconductor s Spec sheet for it. There is
Message 10 of 21 , May 26, 2005
Have you looked at the LM317 adjustable voltage regulator? It can be
wired for current regulation. See National Semiconductor's Spec sheet
for it. There is a battery charger circuit shown there.

Steve
• Yes the good ol 317 - I purchased a packet of them I now everything I make gets one. Daryl. ... From: smgutsch To: Electronics_101@yahoogroups.com Sent:
Message 11 of 21 , May 26, 2005
Yes the good ol' 317 - I purchased a packet of them I now everything I make gets one.

Daryl.
----- Original Message -----
From: smgutsch
Sent: Friday, May 27, 2005 8:39 AM
Subject: [Electronics_101] Re: Lithium Batteries.

Have you looked at the LM317 adjustable voltage regulator?  It can be
wired for current regulation.  See National Semiconductor's Spec sheet
for it.  There is a battery charger circuit shown there.

Steve

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