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 12/120V inverter again
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seb27
New Member

France
2 Posts

Posted - Jun 19 2012 :  10:09:27 AM  Show Profile  Reply with Quote
Hello,

I made the circuit for testing, exactly as described, I just used my home made center tapped tranformer (in order to get an ouput of 12VAC)
It works (I mean I get well 12VAC output) but @ 3000HZ!! and the circuit consumes 3.5A without load , very strange isn'it!?

Did you have an idea of what I could doing wrong?

Thanks
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - Jun 26 2012 :  08:50:33 AM  Show Profile  Reply with Quote
If the transformer is not designed properly then it is probably saturating.

Try the circuit with a 24V center-tapped to 120V power transformer made by a power transformer manufacturer rated for 100W to 300W.
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kasamiko
Apprentece

Philippines
6 Posts

Posted - Sep 02 2012 :  08:05:21 AM  Show Profile  Visit kasamiko's Homepage  Send kasamiko a Yahoo! Message  Reply with Quote
I'm back! and to my surprised this inverter topics never ends..:P


The inverter I made about 8 yrs ago suddenly stop working...upon circuit tracing, i found out that CD4047 is fried..:( don't know what's the reason but my suspect is voltage spike since I never put any zener/decoupling caps on IC Vcc line...

The sad part is it's not available anymore in my place, have to order it online cost about 3.5 US$ in bag of 5.

I got this PWM inverter using SG3524 with feedback using photo-coupler..Got all the stuff and will assemble and assessed its performance later..

BR


rhonn


`


rHoNnZ

Edited by - kasamiko on Sep 02 2012 08:22:20 AM
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - Sep 03 2012 :  12:45:50 PM  Show Profile  Reply with Quote
Hi Rhonn,
I still have some new CD4017 ICs in DIP and surface-mount packages.
I would send you a few but you are too far away on the other side of the world.
Come here to get them.

I still have never needed and have never used an inverter.
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hsh_4321
New Member

1 Posts

Posted - Apr 24 2013 :  07:36:51 AM  Show Profile  Reply with Quote
I'm trying this inverter in proteus simulation
I wanted to know does it work properly with high frequncies too? I want a frequency between 200 to 400 Hz
when I calculate the R and C for 200 and something Hz It kinda works with 18k ohm and 22uF but when I connect the transformer (P:834 ohm,5.4H and S:9 ohm , 0.8mH)the voltage becomes almost zero
is there any calculation that includes all the measures?!
tired of trial and error!!!!
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - Apr 25 2013 :  2:25:14 PM  Show Profile  Reply with Quote
This project works very poorly. The transistors have avalanche breakdown and waste most of the low output power.
A mains transformer is designed to operate at 50Hz or 60Hz and might work poorly at 400Hz.
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Sun Dog
Apprentece

Canada
5 Posts

Posted - Apr 09 2014 :  1:18:03 PM  Show Profile  Reply with Quote
Would it be possible to change this circuit from 12VDC-120VAC to 4VDC-120VAC? I don't expect it to output 1000 watts (although that would be nice), but even 300-400W would be very useful.
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Aaron Cake
Administrator

Canada
6702 Posts

Posted - Apr 10 2014 :  09:36:02 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
The current required at 4VDC would be enormous. Do you want to feed the thing with inch thick solid copper bars? Not to mention that voltage is way too low for the 2N3055s to bias properly. Basically, the circuit would need to be redesigned with a separate oscillator driving a set of more modern IGBTs. But that still doesn't help the current issue. Do you have a 4VDC source which can produce the approx 175A necessary to make 400W (accounting for inefficiency) at 120V? Such a system is best done as a high frequency switcher anyway so you don't need 200LBs transformer.
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Sun Dog
Apprentece

Canada
5 Posts

Posted - Apr 10 2014 :  7:38:20 PM  Show Profile  Reply with Quote
The 4V source is a large (1350Ah) lead acid battery and the manufacture's specs include a draw up to 459A http://rollsbattery.com/public/specsheets/4KS25P.pdf I didn't realize the efficiency of the inverter would be so low but I could live with it. I suppose it wouldn't be any more efficient, but would it be simpler to build a 4VDC to 12VDC converter and then just use a standard 12VDC to 120VAC inverter?
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - Apr 10 2014 :  9:18:17 PM  Show Profile  Reply with Quote
This inverter project does not work. Its maximum output is about 45W at low voltage because the transistors have hardly any base current and they have avalanche breakdown of their emitter-base junctions which are reverse biased far more than the maximum allowed reverse voltage (7V) listed on the datasheet.
Find a better circuit.
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Aaron Cake
Administrator

Canada
6702 Posts

Posted - Apr 13 2014 :  10:33:55 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
quote:
Originally posted by Sun Dog

The 4V source is a large (1350Ah) lead acid battery and the manufacture's specs include a draw up to 459A http://rollsbattery.com/public/specsheets/4KS25P.pdf I didn't realize the efficiency of the inverter would be so low but I could live with it. I suppose it wouldn't be any more efficient, but would it be simpler to build a 4VDC to 12VDC converter and then just use a standard 12VDC to 120VAC inverter?



You need to build a high frequency switching inverter to convert your 4V to 120V to avoid 200 LBs of transformer and massively inefficient circuit. Your battery will last only a few hundred cycles at that kind of discharge. Peukert effect will eat into your AH capacity significantly.

I'd suggest connecting these batteries in series to get the voltage as high as practically possible before bringing it up to 120VAC. If you can get 120VDC or higher then so much the better.
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Sun Dog
Apprentece

Canada
5 Posts

Posted - Apr 13 2014 :  8:29:54 PM  Show Profile  Reply with Quote
Unfortunately I only have one of these batteries and at ~$1400 each I won't/can't be adding any more. I have tried to find a single 2V cell locally so that I could at least deal with a 6V system. Bumping it up to 12V would obviously make everything much easier, but I haven't had any luck sourcing the required batteries. I wonder what would happen if I connected it in series with a regular 12V automotive battery and then tried to charge it with a high quality MPPT solar charge controller? Wonder how long the 12V battery would last?
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Aaron Cake
Administrator

Canada
6702 Posts

Posted - Apr 23 2014 :  10:08:03 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
What exactly are you trying to do?

It might be worth starting a new topic and outlining what you're doing to find some recommendations. You are working with very unusual voltages and I think going about it in a very inefficient way. Depends though on the application.
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n/a
deleted

1 Posts

Posted - Jun 07 2014 :  07:15:13 AM  Show Profile  Reply with Quote
Hai every one
I have a 220 volt Micro wave owen transformer.I am planing to build this circuit.http://www.eleccircuit.com/12-volt-to-220-volt-inverter-500w/. What should be the wire gauge at 12-0-12 side if I have to get 500 watt out put.How to calculate the amp at primary side,is it (500 watt divide by 12 volt) or(500 watt divide by 24 volt).I am confused pls help.

Edited by - n/a on Jun 07 2014 11:18:56 AM
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Aaron Cake
Administrator

Canada
6702 Posts

Posted - Jun 14 2014 :  10:36:24 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
You should have started your own topic as this question does not apply to the inverter schematic on this site.

500W at 220V would require 100A at 12V if efficiency was 100%. As this circuit is way below that value, you will most likely be looking around 140A. Size wire appropriately and you're looking at a transformer not from a microwave, but more from a welder. However these types of transformers often have magnetic shunts to limit current. You'll need to remove those. Passing around 150A requires about 4 gauge cable.
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