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Power supply 3
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Ken O
electronics forum Guru Wannabe


Joined: 27 Oct 2005
Posts: 116

PostPosted: Thu Jul 20, 2006 9:30 pm    Post subject: Power supply 3 Reply with quote

Hi,

Automatic shut off.
I was considering two method for an automatic shut off of a battery charger.
I was looking atthis one from Tony's
http://www.uoguelph.ca/~antoon/circ/bcgla.htm
When the battery is charged Q1 takes over and bypass the battery. But i am
seeing that the positive of the battery is also onenctd to the emitter of
Q1, and the collector to the ground of the battery, Doesn'that mean it is
still charging a bit ?
Also this one thats uses a relay. Is there also one more stable then the
other.
And also I was told that I should add a short circuit protection, in case i
hook up the battery at the wrong pole.
For this I thought of adding a 15 volt zener diode on the ground cable. So
if someone conencts it to the positive of the battery no harm done. Or
possibly a diode and a buzzer from the ground to the positive, so when
hooked up in reverse, the buzzer will sound.
???

ken
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ehsjr
electronics forum Guru


Joined: 03 May 2005
Posts: 863

PostPosted: Fri Jul 21, 2006 12:00 am    Post subject: Re: Power supply 3 Reply with quote

Ken O wrote:
Quote:
Hi,

Automatic shut off.
I was considering two method for an automatic shut off of a battery charger.
I was looking atthis one from Tony's
http://www.uoguelph.ca/~antoon/circ/bcgla.htm
When the battery is charged Q1 takes over and bypass the battery.

No. Read the description at the site.

But i am
Quote:
seeing that the positive of the battery is also onenctd to the emitter of
Q1, and the collector to the ground of the battery, Doesn'that mean it is
still charging a bit ?

It is still charging a bit, but not because of Q1.

Quote:
Also this one thats uses a relay. Is there also one more stable then the
other.

You did not post a reference to what you call "this one".

Quote:
And also I was told that I should add a short circuit protection, in case i
hook up the battery at the wrong pole.
For this I thought of adding a 15 volt zener diode on the ground cable. So
if someone conencts it to the positive of the battery no harm done. Or
possibly a diode and a buzzer from the ground to the positive, so when
hooked up in reverse, the buzzer will sound.
???


ken



For reverse polarity protection:

N/O v====o-----+
Charger (+)-----------o---- |
+---------o---^ N/C |
| |
[Buzzer] --- |
| | /| |
+-----+-----| / |---|<---+
| |/ | D1
| ---
| Ry1
|
Charger (-)-------+---------------------- to battery (-)

If you hook it up properly, the relay will energize,
closing the N/O (Normally Open) relay contact and
completing the circuit from the charger to the battery.

If you hook it up backwards, the relay will not energize,
but the buzzer will have a complete path through the N/C
(Normally Closed) contact to the charger. It will sound
if the charger is turned on.

There are more sophisticated circuits, but I get the sense
you would prefer something simple like this.

Ed
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Ken O
electronics forum Guru Wannabe


Joined: 27 Oct 2005
Posts: 116

PostPosted: Fri Jul 21, 2006 12:12 am    Post subject: Re: Power supply 3 Reply with quote

"ehsjr" <ehsjr@bellatlantic.net> wrote in message
news:YOUvg.301$Wf.1@trndny01...
Quote:
Ken O wrote:
Hi,

Automatic shut off.
I was considering two method for an automatic shut off of a battery
charger. I was looking atthis one from Tony's
http://www.uoguelph.ca/~antoon/circ/bcgla.htm
When the battery is charged Q1 takes over and bypass the battery.

No. Read the description at the site.

But i am
seeing that the positive of the battery is also onenctd to the emitter of
Q1, and the collector to the ground of the battery, Doesn'that mean it is
still charging a bit ?

It is still charging a bit, but not because of Q1.

Because I am a bit confused for the gate 1-8 on the LM 301.
Even with the description, I do not understand.
I think because of the capacitor, the charger do not turn back on.
otherwise it would.


Quote:
Also this one thats uses a relay. Is there also one more stable then the
other.

You did not post a reference to what you call "this one".

oups...
http://www.elecdesign.com/Files/29/1823/Figure_01.gif
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Ken O
electronics forum Guru Wannabe


Joined: 27 Oct 2005
Posts: 116

PostPosted: Fri Jul 21, 2006 12:16 am    Post subject: Re: Power supply 3 Reply with quote

"ehsjr" <ehsjr@bellatlantic.net> wrote in message
news:YOUvg.301$Wf.1@trndny01...
Quote:
Ken O wrote:
Hi,

Automatic shut off.
I was considering two method for an automatic shut off of a battery
charger. I was looking atthis one from Tony's
http://www.uoguelph.ca/~antoon/circ/bcgla.htm
When the battery is charged Q1 takes over and bypass the battery.

No. Read the description at the site.

But i am
seeing that the positive of the battery is also onenctd to the emitter of
Q1, and the collector to the ground of the battery, Doesn'that mean it is
still charging a bit ?

It is still charging a bit, but not because of Q1.

Also this one thats uses a relay. Is there also one more stable then the
other.

You did not post a reference to what you call "this one".

And also I was told that I should add a short circuit protection, in case
i hook up the battery at the wrong pole.
For this I thought of adding a 15 volt zener diode on the ground cable.
So if someone conencts it to the positive of the battery no harm done.
Or possibly a diode and a buzzer from the ground to the positive, so when
hooked up in reverse, the buzzer will sound.
???


ken

For reverse polarity protection:

N/O v====o-----+
Charger (+)-----------o---- |
+---------o---^ N/C |
| |
[Buzzer] --- |
| | /| |
+-----+-----| / |---|<---+
| |/ | D1
| ---
| Ry1
|
Charger (-)-------+---------------------- to battery (-)

If you hook it up properly, the relay will energize,
closing the N/O (Normally Open) relay contact and
completing the circuit from the charger to the battery.

If you hook it up backwards, the relay will not energize,
but the buzzer will have a complete path through the N/C
(Normally Closed) contact to the charger. It will sound
if the charger is turned on.

There are more sophisticated circuits, but I get the sense
you would prefer something simple like this.

I am just starting out, I dom not know what is better, Actually I found only
one circuit, which was extremely complex and had other components beside it,
So I did not bother.
so what does the other sophisticated circuits have more?

ken
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