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'[EE] Suggestions for my constant voltage, current '
2011\09\05@072743 by V G

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Circuit (click to enlarge)

[image: cc.png] <http://solarwind.byethost7.com/cc.png>
http://solarwind.byethost7.com/cc.png


I designed this Li-ion charging circuit so I could select my own maximum
charge voltage (so I could get a better service life out of the cell by
charging it up to only 4.0V or less). At the same time, I can fine tune the
maximum charge current. This method (constant voltage with current limit)
models (as far as I know) the normal method for charging Li-ion (constant
current until a certain voltage is reached, then switch to a constant
voltage).

I would like some suggestions for it as I'm pretty sure there are a few
things to improve.

* The chip in the middle is a high side current sense amplifier.
* The voltage source on the left is my best attempt at modelling a Li-ion
battery. It gains voltage as it's being "charged" (DC operating point
stepped to increase voltage).

* Graph:
** cyan: power dissipated by the MOSFET
** blue: current through r_sense and the battery
** red: MOSFET gate voltage
** green: voltage across the "battery"


Questions:

* I placed C2 (next to the MOSFET) to smooth out the gate voltage and give a
more "analog" signal so the MOSFET can control the current better. Thoughts
about this?
* I chose a MOSFET instead of a BJT so I can get the full 4.0V out of the
charging voltage source. Thoughts?
* What are your general opinions about this circuit? Could anything be done
better? Is the whole concept here stupid to begin with?
* Is C1 (above the opamp) too large a value? I was suggested a value of
around 50pF a while ago while designing using a similar circuit block, for
opamp voltage output stability. Note that there's also C2 (beside the
MOSFET) as well, which I believe serves the same purpose

2011\09\12@084057 by V G

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On Mon, Sep 5, 2011 at 7:27 AM, V G <spam_OUTx.solarwind.xTakeThisOuTspamgmail.com> wrote:

{Quote hidden}

Anyone? :

2011\09\12@093033 by Isaac Marino Bavaresco

flavicon
face
Perhaps if you post a valid link somebody will respond.




Em 12/9/2011 09:40, V G escreveu:
{Quote hidden}

> Anyone? :(

2011\09\12@093747 by V G

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On Mon, Sep 12, 2011 at 9:30 AM, Isaac Marino Bavaresco <
isaacbavarescospamKILLspamyahoo.com.br> wrote:

> Perhaps if you post a valid link somebody will respond.
>

I don't understand. The link http://solarwind.byethost7.com/cc.png is
working for me.

In any case, here's another link: http://i.imgur.com/cNX8X.pn

2011\09\12@100858 by Isaac Marino Bavaresco

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face
Em 12/9/2011 10:37, V G escreveu:
> On Mon, Sep 12, 2011 at 9:30 AM, Isaac Marino Bavaresco <
> .....isaacbavarescoKILLspamspam.....yahoo.com.br> wrote:
>
>> Perhaps if you post a valid link somebody will respond.
>>
> I don't understand. The link http://solarwind.byethost7.com/cc.png is
> working for me.


Perhaps it's because your browser has a cookie that allows logging-on
automatically.


>
> In any case, here's another link: http://i.imgur.com/cNX8X.png


This one worked.

2011\09\12@121940 by V G

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On Mon, Sep 12, 2011 at 10:07 AM, Isaac Marino Bavaresco <
EraseMEisaacbavarescospam_OUTspamTakeThisOuTyahoo.com.br> wrote:

> Perhaps it's because your browser has a cookie that allows logging-on
> automatically.
>

Nope, just tested it on a random university computer and it works fine

2011\09\13@113922 by Tamas Rudnai

face picon face
I remember we have already discussed about this: Not to post things on
untrusted sites.

Probably this site is blocked by many of us either on the ISP side or in the
company's firewall / router / proxy or whatever.

Tamas




On Mon, Sep 12, 2011 at 5:19 PM, V G <x.solarwind.xspamspam_OUTgmail.com> wrote:

> On Mon, Sep 12, 2011 at 10:07 AM, Isaac Marino Bavaresco <
> @spam@isaacbavarescoKILLspamspamyahoo.com.br> wrote:
>
> > Perhaps it's because your browser has a cookie that allows logging-on
> > automatically.
> >
>
> Nope, just tested it on a random university computer and it works fine.
>

2011\09\13@122649 by V G

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On Tue, Sep 13, 2011 at 11:39 AM, Tamas Rudnai <KILLspamtamas.rudnaiKILLspamspamgmail.com>wrote:

> I remember we have already discussed about this: Not to post things on
> untrusted sites.
>

How would you define a "trusted" site?


> Probably this site is blocked by many of us either on the ISP side or in
> the
> company's firewall / router / proxy or whatever.
>

This website is as legitimate as any other

2011\09\13@125903 by Tamas Rudnai

face picon face
On Tue, Sep 13, 2011 at 5:26 PM, V G <RemoveMEx.solarwind.xTakeThisOuTspamgmail.com> wrote:

> On Tue, Sep 13, 2011 at 11:39 AM, Tamas Rudnai <spamBeGonetamas.rudnaispamBeGonespamgmail.com
> >wrote:
>
> > I remember we have already discussed about this: Not to post things on
> > untrusted sites.
> >
>
> How would you define a "trusted" site?
>

OK, then again: The site is sharing the IP address with many other websites,
many of them are parked domains, but many others are malicious, or phishing
etc -- I ask the same question from you: How do you define trusted?


> Probably this site is blocked by many of us either on the ISP side or in
> > the company's firewall / router / proxy or whatever.
>
> This website is as legitimate as any other.
>

Maybe, but as it shares IP with non-legitimate ones you can expect that
security experts are ruling out every singe site coming from that place --
aka blocking it's IP address entirely.

It is not my trouble what you are using, I only wanted to warn you that the
site is dodgy and it is your interest to move your stuff to somewhere
else... again, not my problem as I have my Websense gateway protecting me
;-)

Tamas




>

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