| T O P I C R E V I E W |
| ericdhs |
Posted - Aug 31 2006 : 2:13:13 PM
Hi, I'm Eric. I found this Automatic 12V Lead Acid Battery Charger from your website and I would like to construct it.
http://www.aaroncake.net/circuits/charger2.htm
But i am not sure how to connect the SCR and TRIAC. I would like to ask how to connect the SCR and TRIAC in the circuit. Can you tell me for Q1 which is the TRIAC, which pin is to be connected to D2. and how about the other two pins?
And so for Q2 which is the SCR. I hope you can reply me as soon as possible. because i am stuck at the moment. |
| 15 L A T E S T R E P L I E S (Newest First) |
| pebe |
Posted - Apr 03 2010 : 04:31:01 AM
If you know how it works, then try to repair it.
If not, buy another. |
| hellion |
Posted - Apr 02 2010 : 11:39:09 PM
I was using my 600 VA UPS as a inverter for my 12v 200ampere battery but its not working these days
what can i do to make it work |
| DexterLB |
Posted - Jul 28 2009 : 02:12:04 AM
Hello.
I saw [url=http://www.aaroncake.net/CIRCUITS/charger2.asp]this charger circuit[/url]. It seems pretty good to me, so I want to make it.
But I have a question: :)
I want to charge a 12V/7Ah sealed lead-acid battery. But it's max charging current is 1.8A, and it's optimal charging current is 700mA. How can I lower the output current? |
| darchua1 |
Posted - Nov 26 2007 : 08:58:13 AM
Hi all,I'm Darren. Regarding one of the earlier post where there was a link: http://www.vt52.com/diy/myprojects/other/charger/charger.htm
I'm thinking of building the 1.2A version charger. The battery I'm charging is a 6V 4Ah Lead Battery. From the equations provided, I should be getting a max current of 0.4A and a resistance(R) of 1.5ohms. From this values, I would be expecting power of 0.24W at my resistor(R). The resistor I'm using for R is only 0.25W. Would that burn the resistor? By the way, do I need to bother about the power rating of the other resistors too, expecially the variable resistor? If all the resistors were rated to be 0.25W, would that be ok? I look forward to the reply. Thanks :) |
| pebe |
Posted - May 29 2007 : 2:17:57 PM
I’ve had no luck looking for switch mode circuits for the current you want. There’s probably not much demand by ‘do it yourself’ people. But here is a site with useful information on charging, if it’s of any use to you.
http://www.batteryuniversity.com/partone-13.htm
You will see they recommend a 36hour charge for large batteries like yours. So perhaps you could get by with 15A. It might then be possible to modify the published circuit.
|
| kivdenn |
Posted - May 28 2007 : 11:42:17 AM
I have two 530AH 12V batteries connected in series thats why I need the 25Amps and the 30Volts is the transformer output. When I disconnect the circuitry the transformer cools down. Do you have access to any of the switched mode supply battery charger circuits. Please avail me some. Thanks, Dennis. |
| pebe |
Posted - May 28 2007 : 08:29:11 AM
There is no way you can get 25A out of this charger - Q1 is only rated at 4A max. If you want that sort of current then you would best go to a switched mode supply. Why would you want to charge a battery at 25A, anyway?
30V is way too much for the supply. You would need a rethink of the component values R4 to R8 and some form of current limiting would be required.
Regarding the transformer overheating. Are you sure the primary of your transformer matches your mains supply? |
| kivdenn |
Posted - May 28 2007 : 03:35:02 AM
I used a 30VAC 40 Amps out put transformer but is geting too hot I dont know what is causing this.Dennis |
| kivdenn |
Posted - May 28 2007 : 03:30:06 AM
Thanks Pal but I used a Transformer of 30VAC,40 Amps and the transformer is very hot, I dont know what is making it hot. Also the output current is very low yet I want a minimum of 25 AMps. Thanks |
| pebe |
Posted - May 26 2007 : 11:53:30 AM
No. Only replace the resistor. That will give the same value at R2 slider for a 24volt battery, as the original R1 did for a 12volt one.
You will, of course, need to change T1 for one with a higher secondary voltage output. |
| kivdenn |
Posted - May 26 2007 : 10:47:21 AM
How about the zener diode, should I double the zener voltage or I just half it. Thanks |
| pebe |
Posted - May 26 2007 : 07:05:09 AM
Just replace R1 with resistors to give a total value of 1090ohms. A 1000ohms and a 100ohms in series will probably be near enough. |
| kivdenn |
Posted - May 26 2007 : 06:25:59 AM
Cake thanks for the reply but you will forgive me I dont know how to use these calculators. Am begging you to do the calculation for me please. What I need are the values of the three resistors. Remember am in Africa. Thanks Dennis |
| Aaron Cake |
Posted - May 24 2007 : 09:48:36 AM
It's a voltage divider circuit. Search Google for "voltage divider resistor calculator". |
| kivdenn |
Posted - May 23 2007 : 07:23:11 AM
Qute: R1, R2, R3 and D3 determine charge voltage.
Thanke Cake for that response but what values exactly should I use for the components identified. Thanks Dennis |
