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srimovva
New Member
India
1 Posts |
 Posted - Jul 28 2007 : 09:05:55 AM
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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
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| 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
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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
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| 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
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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
6718 Posts |
Posted - Aug 02 2007 : 09:56:11 AM
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| 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
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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
6718 Posts |
Posted - Aug 04 2007 : 10:36:39 AM
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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
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| 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
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| 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
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| 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
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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
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| 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
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| 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
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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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Topic |
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12/120V inverter again
