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 12/120V inverter again
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kako
New Member

4 Posts

Posted - Feb 02 2008 :  6:19:58 PM  Show Profile  Reply with Quote
but its input voltage is 12V so that would mean i would need a battery with constant 150amps maybe?? Does that even exist cause i know car batteries have more amps but they are cranking not coinstant
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - Feb 02 2008 :  6:55:54 PM  Show Profile  Reply with Quote
150A at 12V is 1800W. A good inverter circuit could have an output of 1500W plus 300W of heat.
A car battery is used for only a few seconds so it doesn't boil when starting a car. It is not designed for continuous high current nor for deep discharge like an inverter's battery needs to be.

Huge batteries used in electric fork lift trucks can continuously supply high current without overheating.
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troyboy76127
New Member

USA
1 Posts

Posted - Feb 06 2008 :  9:27:53 PM  Show Profile  Reply with Quote
does anyone know how to change the frequency output on the inverter? i am guessing caps of different frequency. i want to be able to adjust it like a variable freq drive from 0-300hz....thanks..........troy
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - Feb 06 2008 :  11:39:14 PM  Show Profile  Reply with Quote
Every inverter has an oscillator. One or two resistors and/or capacitors could have their values changed to change the frequency.
But first you must select an inverter circuit that works. The inverter here does not work.

When you use a transformer designed for 50Hz or 60Hz and try to increase the frequency then the transformer might not work well.
When you decrease the frequency then the transformer will saturate which increases the current and blows up the transistors.
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Tolexp
New Member

Nigeria
1 Posts

Posted - Feb 07 2008 :  03:30:52 AM  Show Profile  Reply with Quote
Good day sir,i got your inverter circuit diagram of 12v to 120v. i try to practicalise it, but am unable to get 68uf,25v tantalum capacitor in my environment.please sir help with a substitution for the 68uf,25v tantalum capacitor or any capacitor to reply, because i can't get it in my environment. thanks sir
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Rifat Ahmed Khan
New Member

Bangladesh
1 Posts

Posted - Feb 07 2008 :  05:10:56 AM  Show Profile  Reply with Quote
Hello to Mr. moderator, Mr. audioguru and everyone reading this.
i'm a new member and having some difficulties. i visiteded some pages on topic_id=2996 on inverters but couldn't find any specific location for the design and schematics of an inverter. i am an U.G. student and want to work out a project on a transformerless 12v dc-240v ac boost inverter. probably this could be done using IGBTs. this is an emergency because i have to submit a project proposal by next sun day, 10 Feb, so, i need a material with complete theoretical solution and schematics. reading you i found that you are the best. Please help me.

shuvo
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pebe
Nobel Prize Winner

United Kingdom
1078 Posts

Posted - Feb 07 2008 :  08:41:41 AM  Show Profile  Reply with Quote
quote:
Originally posted by Rifat Ahmed Khan

.....i am an U.G. student and want to work out a project .... so, i need a material with complete theoretical solution and schematics.

Why do you expect someone else to give you a complete design for your classwork?
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - Feb 07 2008 :  10:55:17 AM  Show Profile  Reply with Quote
quote:
Originally posted by Tolexp

Good day sir,i got your inverter circuit diagram of 12v to 120v. i try to practicalise it, but am unable to get 68uf,25v tantalum capacitor in my environment.please sir help with a substitution for the 68uf,25v tantalum capacitor or any capacitor to reply, because i can't get it in my environment. thanks sir


This inverter project does not work. Read about it in this thread.
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aydot96
New Member

Nigeria
2 Posts

Posted - Feb 09 2008 :  12:12:57 PM  Show Profile  Reply with Quote
goodday sir,can you please send me another circuit of dc to ac inverter. i have the problem of getting 68uf,25v capacitor in my area.please what is the substitute the it. thanks

aydot
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - Feb 09 2008 :  1:13:52 PM  Show Profile  Reply with Quote
quote:
Originally posted by aydot96

goodday sir,can you please send me another circuit of dc to ac inverter. i have the problem of getting 68uf,25v capacitor in my area.please what is the substitute the it. thanks


If you search for inverter Circuit in Google then you will find links to hundreds of them. Some work and some don't.
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kasamiko
Apprentece

Philippines
6 Posts

Posted - Feb 24 2008 :  04:44:44 AM  Show Profile  Visit kasamiko's Homepage  Send kasamiko a Yahoo! Message  Reply with Quote
@audioguru...

I'm suffering from INVERTER paranoia....


rhonn

rHoNnZ
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tim
Mad Scientist

198 Posts

Posted - Feb 24 2008 :  06:17:15 AM  Show Profile  Reply with Quote
yup hes right that the inverter here dont work . ive tried EVERYTHING to get it to work. LOL LOL.
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - Feb 24 2008 :  11:18:31 AM  Show Profile  Reply with Quote
Rhonn's 500W inverter works perfectly and has for years.
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kasamiko
Apprentece

Philippines
6 Posts

Posted - Feb 24 2008 :  8:33:42 PM  Show Profile  Visit kasamiko's Homepage  Send kasamiko a Yahoo! Message  Reply with Quote
quote:
Originally posted by audioguru

Rhonn's 500W inverter works perfectly and has for years.



In fact i've already produced dozen of it..powering 14" colored tv's and cheap China made dvd's...

the only problem I've encountered is when the inverter is working with loads and suddenly the alligator clips slip off the battery terminal...all output transistors are toasted..

rHoNnZ
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - Feb 24 2008 :  9:56:05 PM  Show Profile  Reply with Quote
Hi Rhonn,
Powerful Zener diodes across the ouput transistors will arrest the high voltage spike and save the transistors. Maybe about 40V/10W.
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