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Forum Index : Electronics : Simple battery charger

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SpmP
Newbie

Joined: 10/10/2010
Location: New Zealand
Posts: 32

Posted: 09:23pm 06 Jun 2012

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DeltaV is the difference between battery voltage with shunt load on or off. It was actually more like 1.75V
The timescael is 20us per dvision.

Here is the circuit on the PCB, I added another resistor in parallel in the bottom leg of the resistor divisors from Vb.

The shunt is connected as with the ghurd controller and is supposed to limit battery voltage. As I said, I will try the converse with the circuit in a diversion arrangement (switch panel on and off).

Dammit, my once super reliable goot soldering iron has just broken...rrr.

I guess I need a 10A 30V/48V source to see what happens under high load.

right, reading to chicken pocked kids, poor things.

larny
Guru

Joined: 31/10/2011
Location: Australia
Posts: 346

Posted: 05:40pm 07 Jun 2012

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I have made some suggestions on your circuit below. I found some of the figures impossible to read.

You're operating the opamp on a 7 volt supply. This is unnecessarily low when the battery voltage is 24.

You will of course, have to change some of the resistor values.

Have you had the chicken pox?

I caught it from my children when I was about 28.

When my wife took the girls to the Dr., she asked him about me catching it, he said that I would have had them as a child.

The girls were only mildly affected, but I had to spend a week in bed.

I went to a different Dr. after the week in bed, and he said "of course you could have had an injection to prevent this".

So I suggest, if you did not have the chicken pox as a child, you should have the injection ASAP.

Len

Edited by larny 2012-06-09

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