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 12/120V inverter again
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srimovva
New Member

India
1 Posts

Posted - Jul 28 2007 :  09:05:55 AM  Show Profile  Reply with Quote
quote:
Originally posted by phoenix

HEY! Thanks 4 the advice...


T-boss

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newjazzy2005
Apprentece

5 Posts

Posted - Jul 28 2007 :  12:36:15 PM  Show Profile  Reply with Quote
please i need an inverter circuit schmatic diagram that wiil give 220vac voitage and it input will be 12 or 24 vdc and wiil be able to last for 2 hour thanks
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audioguru
Nobel Prize Winner

Canada
4218 Posts

Posted - Jul 28 2007 :  4:17:50 PM  Show Profile  Reply with Quote
Any inverter will last for 2 hours or more if its battery is big and its load current is low.
I can buy a amall 75W inverter for a low price. A car battery will last 10 hours powering it if it has a 75W load.
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mansoorkkl
Apprentece

India
5 Posts

Posted - Jul 31 2007 :  12:15:41 PM  Show Profile  Reply with Quote
I need 12VDC To 220VAC 1000W To 1500W Invertor Pls Send Me Diagram And All Detail
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audioguru
Nobel Prize Winner

Canada
4218 Posts

Posted - Jul 31 2007 :  1:47:07 PM  Show Profile  Reply with Quote
The current in the output transistors and from the battery will be 150A if the load on a 12V inverter is 1500W. A big car battery will explode. The transformer will be huge and will cost a fortune. Many transistirs will be needed.
Rediculous.
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Aaron Cake
Administrator

Canada
6710 Posts

Posted - Aug 02 2007 :  09:56:11 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
I think it may be time to close this topic? Every possible inverter question has been asked and answered multiple times.
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audioguru
Nobel Prize Winner

Canada
4218 Posts

Posted - Aug 02 2007 :  09:59:37 AM  Show Profile  Reply with Quote
Most questions about high power inverters are coming from countries without electricity.
Where do they charge the battery?
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Aaron Cake
Administrator

Canada
6710 Posts

Posted - Aug 04 2007 :  10:36:39 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
My guess would be wind, solar, treadmill, etc.

But I wonder where they get the parts?
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tim
Mad Scientist

198 Posts

Posted - Aug 04 2007 :  4:25:09 PM  Show Profile  Reply with Quote
well if they got a computer to ask what they ask then they can get parts mailed to them i would imagine, lol lol......
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audioguru
Nobel Prize Winner

Canada
4218 Posts

Posted - Aug 04 2007 :  4:41:21 PM  Show Profile  Reply with Quote
They don't have any money or credit cards and they probably don't have a postal system.
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cisco229
New Member

USA
4 Posts

Posted - Aug 04 2007 :  6:38:02 PM  Show Profile  Visit cisco229's Homepage  Send cisco229 an AOL message  Reply with Quote
Hello, How are you, i wanted to build a inverter, but I am just a newbie, im tired of trying that aaroncake one, dont work, i want something simple & easy to build, even if its only 60 watts if you can help contact me At Cisco229@comcast.net, i just need to see how they work, in the most basic form then I can Do the math and make it better, thank you very much
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audioguru
Nobel Prize Winner

Canada
4218 Posts

Posted - Aug 05 2007 :  1:10:49 PM  Show Profile  Reply with Quote
Make an oscillator from a CD4047 IC, a resistor and capacitor. The IC has two outputs which are out-of-phase and they are perfect to drive two power Mosfets that drive a center-tapped stepup transformer.
Then you will have a very simple square-wave inverter.
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mrgone
Nobel Prize Winner

USA
1176 Posts

Posted - Aug 11 2007 :  8:01:36 PM  Show Profile  Reply with Quote
How is the power (wattage) calculated? I was surprized that you need a 16 Amp Xformer to achieve only 300 watts. I know there is an efficiency consideration but the way I see it is 15 Amps X (120 volts X rms or .707) = 1272 watts. If we divide 300 by 1272 we get only 23 % efficiency of the xformer. Does this sound correct?
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audioguru
Nobel Prize Winner

Canada
4218 Posts

Posted - Aug 11 2007 :  11:15:30 PM  Show Profile  Reply with Quote
The square-wave inverter circuit heats with about 20% of its max power output. So a 300W inverter uses 360W from the battery. The battery current flows through the low voltage winding of the transformer and through the output transistors and is 360W/12V= 30A.
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mrgone
Nobel Prize Winner

USA
1176 Posts

Posted - Aug 12 2007 :  1:31:48 PM  Show Profile  Reply with Quote
quote:
Originally posted by audioguru

The square-wave inverter circuit heats with about 20% of its max power output. So a 300W inverter uses 360W from the battery. The battery current flows through the low voltage winding of the transformer and through the output transistors and is 360W/12V= 30A.



OK, Would it be more efficient if you shape the wave first? You could get some reasonable facsimile of a sine wave using an RC filter arangement. Also what you were talking about above. I do the same thing with 74HC04s (inverters). Make an oscillator with it and feed the output to the remaining inverters to get the two phases.
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