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kaycee
Apprentece

Philippines
19 Posts
Posted - Mar 06 2014 :  8:31:56 PM  Show Profile  Reply with Quote
Hello. I'm just thinking what is the output power of this circuit and how will it take to fully charge the battery? Thanks. :)) Please help me.

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Aaron Cake
Administrator

Canada
6717 Posts
Posted - Mar 07 2014 :  11:17:41 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
Up to about 5A, depending on the transformer.

And how long it takes to charge depends on the battery. If you are charging at about 5A then it will take about an hour to charge a 5AH battery from stone dead, for example.
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kaycee
Apprentece

Philippines
19 Posts
Posted - Mar 07 2014 :  8:39:55 PM  Show Profile  Reply with Quote
What kind of transfomer should I use? Thank you po. :)
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kaycee
Apprentece

Philippines
19 Posts
Posted - Mar 07 2014 :  9:01:51 PM  Show Profile  Reply with Quote
I need a circuit of 12V battery charger that has a high output power how should i do it with this circuit? Is this the highest output power of the circuit? Thank you for the help. :)
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kaycee
Apprentece

Philippines
19 Posts
Posted - Mar 08 2014 :  04:30:30 AM  Show Profile  Reply with Quote
I have a transformer 12V 6A. Is it okay? And the TRIAC is BT136-600D.
I dont know where to put the heatsink because it says that it is for 'U1' I don't know where U1 is. Please reply.
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kaycee
Apprentece

Philippines
19 Posts
Posted - Mar 08 2014 :  04:42:09 AM  Show Profile  Reply with Quote
Can I use different SCR because it is not available in the store. Please tell me its equivalent.
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Aaron Cake
Administrator

Canada
6717 Posts
Posted - Mar 10 2014 :  3:19:23 PM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
The heatsink is installed on Q1. Sorry for the mistake in the parts list.

Doesn't your electronics store have a parts catalog with substitutions? Find out what line of semiconductors they sell and look up the equivelant TRIAC from that company. Any TRIAC of similar specs will do.

Yes, that 12V 6A transformer is fine.
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kaycee
Apprentece

Philippines
19 Posts
Posted - Mar 15 2014 :  01:24:10 AM  Show Profile  Reply with Quote
Thank you. :)
Can you please explain to me how the circuit works, current flow and the functions of the components? Thank you so much for the help. :)) God bless
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Aaron Cake
Administrator

Canada
6717 Posts
Posted - Mar 17 2014 :  10:42:52 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
I have explained the circuit at least 10 times on this forum. I searched for "battery charger explanation" and came up with this topic which covers the circuit in detail:

http://www.aaroncake.net/forum/topic.asp?TOPIC_ID=5954

That topic contains probably everything you would ever need to know about the circuit.
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kaycee
Apprentece

Philippines
19 Posts
Posted - Mar 18 2014 :  12:15:27 AM  Show Profile  Reply with Quote
I have constructed the circuit and its out voltage is only 8V. I used transformer 12V 6A. :(
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kaycee
Apprentece

Philippines
19 Posts
Posted - Mar 18 2014 :  12:22:25 AM  Show Profile  Reply with Quote
Also, i removed the potentiometer.
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pebe
Nobel Prize Winner

United Kingdom
1078 Posts
Posted - Mar 18 2014 :  01:35:10 AM  Show Profile  Reply with Quote
How can you remove the potentiometer and expect the circuit to work? Have you got a battery connected?
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kaycee
Apprentece

Philippines
19 Posts
Posted - Mar 18 2014 :  05:20:29 AM  Show Profile  Reply with Quote
I didn't connect the battery i just measured the output voltage. I removed the potentiometer because i thought it is just for the changing output voltage. I only need a 12V output. What should i do? Thanks for the help.
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kaycee
Apprentece

Philippines
19 Posts
Posted - Mar 18 2014 :  06:05:55 AM  Show Profile  Reply with Quote
Also, i change r1 and r3 to 1k ohm. and the output voltage went up to 9.6V. Is it okay?
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pebe
Nobel Prize Winner

United Kingdom
1078 Posts
Posted - Mar 18 2014 :  06:45:59 AM  Show Profile  Reply with Quote
You are only getting 8V because you have not connected a battery. Because it only uses a half wave rectifier, there will only be a voltage at the output on positive half cycles. With no smoothing, you are reading 50% of the mean level of the rectified RMS voltage - less the voltage drops of the rectifier and the gate-emitter of the triac - and the reading you are getting is roughly correct.

Put the circuit back as it should be and then connect a 100µF 25V cap across the output. It should then read OK. Adjust the output voltage to 13.8V and you are all set to charge the battery. You can leave the cap connected if you want to.
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kaycee
Apprentece

Philippines
19 Posts
Posted - Mar 18 2014 :  07:31:56 AM  Show Profile  Reply with Quote
What is the use of potentiometer in this circuit?
Thank you so much for answering my questions :) Really helped a lot.:))
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