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 12/120V inverter again
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khaled125
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18 Posts

Posted - Oct 09 2007 :  6:31:05 PM  Show Profile  Send khaled125 a Yahoo! Message  Reply with Quote
ok thank u ..but what will be the result if i use it with this circuit plz

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audioguru
Nobel Prize Winner

Canada
4218 Posts

Posted - Oct 09 2007 :  11:25:31 PM  Show Profile  Reply with Quote
You found the schematic of an inverter from a Japanese guy.
Then why don't you read the entire project including his test of it?
http://hobby_elec.piclist.com/e_ckt30.htm

Its output voltage is 10% high without a load and is 10% low with a load of only 140W.
Then your 220V will be 242V without a load and will be 198V with a 140W load. Pretty bad voltage regulation.

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khaled125
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18 Posts

Posted - Oct 09 2007 :  11:41:38 PM  Show Profile  Send khaled125 a Yahoo! Message  Reply with Quote
thanks a lot...but what should i do now change the transformer or what
thank u in advance
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audioguru
Nobel Prize Winner

Canada
4218 Posts

Posted - Oct 10 2007 :  10:46:06 AM  Show Profile  Reply with Quote
Use a more powerful center-tapped transformer with only two more powerful Mosfets.
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khaled125
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18 Posts

Posted - Oct 10 2007 :  1:02:26 PM  Show Profile  Send khaled125 a Yahoo! Message  Reply with Quote
thanks for ur advice
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khaled125
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18 Posts

Posted - Oct 10 2007 :  4:56:23 PM  Show Profile  Send khaled125 a Yahoo! Message  Reply with Quote
Can we use a circuit before the battery in order 2 charge through the voltage 220V in other words inverting circuit from 220 to 12 V, and ofcourse with a suitable Amps??
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audioguru
Nobel Prize Winner

Canada
4218 Posts

Posted - Oct 10 2007 :  5:33:42 PM  Show Profile  Reply with Quote
You can use the transformer from an inverter in a battery charger if you disconnect most of the inverter's circuit from the transformer.
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khaled125
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18 Posts

Posted - Oct 10 2007 :  6:01:38 PM  Show Profile  Send khaled125 a Yahoo! Message  Reply with Quote
Thank u for answering me here in our country there is an inverter sold at about 200$ it is made locally the input is 12V and the output is 220V and 700 watt.can u guess the specifications of the transformer of it plz? thanks once more.
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khaled125
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18 Posts

Posted - Oct 10 2007 :  6:05:38 PM  Show Profile  Send khaled125 a Yahoo! Message  Reply with Quote
sorry..I read the word "charger" on that inverter case what is meant by "charger" here.Sorry but as u may no that am new and this is my first try to make an inverter by my slef so tolrate me if asked u much.
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audioguru
Nobel Prize Winner

Canada
4218 Posts

Posted - Oct 10 2007 :  8:48:40 PM  Show Profile  Reply with Quote
quote:
Originally posted by khaled125

here in our country there is an inverter sold at about 200$ it is made locally the input is 12V and the output is 220V and 700 watt.can u guess the specifications of the transformer of it plz?

The 700W inverter gets warm or hot because it has some losses. The wasted heat is probably about 100W so the 12V car battery, the Mosfets and the 12V winding on the transformer must be rated for 800W/12V= 66.7A.
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khaled125
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18 Posts

Posted - Oct 11 2007 :  4:50:18 PM  Show Profile  Send khaled125 a Yahoo! Message  Reply with Quote
last question plz I am thinking of something but i dont no if it is right just thinking of it which it is that i want 2 make the circuit which converts the 6V dc into 12V dc and then connect it to the inverter since the inverter needs 12V. Will it work?if it will, can u tell me what is the specifications of the 6V battery should be(i dont no if am right or fool in such a thing)coz at the time being i cant get a battery of a car coz the cross-points are blocked and they dont allow any thing to pass these days.This is y am thinking of such a thing.and i would like to thank u much for not ignoring my question .
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audioguru
Nobel Prize Winner

Canada
4218 Posts

Posted - Oct 11 2007 :  5:45:13 PM  Show Profile  Reply with Quote
The 6V to 12V circuit has an output of only 0.8A at 12V. The 700W inverter needs 66.7A at 12V.
Where is the missing 65.9A going to come from??

Why not make a 700W inverter with a 6VDC input and a 220VAC output?
Use a huge 6V battery that can supply 133.3A.
Use a 220V to 12V/134A center-tapped transformer (800W).
Use many logic-level Mosfets (they turn on with a gate voltage of only 5V) to switch the 133.3A from the battery to the transformer.
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khaled125
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18 Posts

Posted - Oct 11 2007 :  7:07:42 PM  Show Profile  Send khaled125 a Yahoo! Message  Reply with Quote
Thanks a lot
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Aaron Cake
Administrator

Canada
6710 Posts

Posted - Oct 14 2007 :  10:32:16 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
Can we please keep this topic actually on topic? With over 100,000 reads it's probably the most popular and informative on this forum and I would hate to have to delete large chunks out of it to clean it up.

That said, maybe it is time to just lock it since all new questions seem to be a complete repeat of previous questions.
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khaled125
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18 Posts

Posted - Oct 14 2007 :  11:39:21 AM  Show Profile  Send khaled125 a Yahoo! Message  Reply with Quote
http://www.sis.gov.eg/En/Default.htm
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