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12 V DC to a 220V AC Inverter AMplfier Design
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| | |-+  12 V DC to a 220V AC Inverter AMplfier Design
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audioguru
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« Reply #14 on: June 18, 2006, 07:06:00 PM »

Maybe your load doesn't need a sine-wave and will work from a simple square-wave inverter.
A "modified sine-wave" inverter has a square-wave with a step in it and isn't too hard to make.
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kachew
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« Reply #15 on: July 25, 2006, 06:37:53 AM »

Dear Audioguru,
 Do you have the modified sinewave inverter circuit Huh can share it out for our knowledge?? Grin Grin just asking....
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audioguru
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« Reply #16 on: July 25, 2006, 08:59:02 AM »

Do you have the modified sinewave inverter circuit Huh
Somebody posted a circuit but it is on the broken hard drive of my old computer.
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kachew
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« Reply #17 on: July 25, 2006, 09:49:38 AM »

dear audioguru,
 
can u describe how its look like?? hehe Grin  Grin maybe i have it... Grin Grin
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kachew
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« Reply #18 on: August 09, 2006, 03:03:50 AM »

 Grin Grin
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audioguru
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« Reply #19 on: August 09, 2006, 07:37:38 AM »

A square-wave inverter 's output goes: positive pulse, negative pulse, positive pulse again, negative pulse again and repeats.

A simple modified sine-wave inverter's output goes: positive pulse, 0V pause, negative pulse, 0V pause, positive pulse again, 0V pause again, negative pulse again, 0V pause again and repeats.
It is not difficult to make the 0V pauses.

I don't bother with a modified sine-wave inverter because tools with variable speed motors and other things don't work properly with it.
 
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kachew
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« Reply #20 on: August 15, 2006, 07:10:09 PM »

dear audio guru do u have any idea to implement this?? for example we take kasamiko inverter how do we make it from square wave to modified sine wave?? Huh ???thanks lots
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audioguru
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« Reply #21 on: August 15, 2006, 08:36:58 PM »

You could make a modified sine-wave with a CD4047 oscillator and a CD4001 quad NOR gate or CD4011 quad NAND gate.
The oscillator of the CD4047 and its Q output would be gated and drive one of the push-pull output transistors. The oscillator output and the Q-Not output would be gated and drive the other push-pull output transistor.
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kachew
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« Reply #22 on: August 16, 2006, 11:11:31 AM »

dear audioguru can u show or tell me how can i connect it to be modified sine wave?? can i use the circuit i posted here http://www.electronics-lab.com/forum/index.php?topic=1360.112 to change from sine wave to modified sine wave inverter? cos i wan to use mosfet than transistor to increase the efficiency of the inverter...thanks lots Grin Grin
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audioguru
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« Reply #23 on: August 16, 2006, 01:20:21 PM »

I already told you how to connect a CD4047 with logic gates that drive your Mosfets with a modified sine-wave. The timing diagram looks like this:
EDIT: Corrected the clock's pin number.
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kachew
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« Reply #24 on: August 16, 2006, 09:39:53 PM »

hi audioguru,

i just wan to know the use which pin to connect to the pin Q and inverted Q of cd 4047? Cry Cry
and how about i add LM358 amplifier to increase the output current from the CD4047 in order to increase the efficiency? Huh Huh
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audioguru
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« Reply #25 on: August 16, 2006, 10:27:30 PM »

i just wan to know the use which pin to connect to the pin Q and inverted Q of cd 4047?
Sorry, I had the pin number of the clock for the CD4047 wrong. I fixed it.
Connect the pin 13 and pin 10 to one gate of a CD4011 which drives the 1st Mosfet. Connect the pin 13 and pin 11 to another gate of the CD4011 and it drives the 2nd Mosfet.

Quote
how about i add LM358 amplifier to increase the output current from the CD4047 in order to increase the efficiency?
At only 50Hz or 60Hz, I don't think the switching speed makes any difference. If it was 50kHz or 500kHz then a lot of current is needed to charge and discharge the high gate capacitance of the Mosfets for them to switch quickly so they don't get hot. An LM358 is about the slowest opamp that is made, even slower than an old 741 opamp. It would be lousy for driving Mosfets.
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kachew
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« Reply #26 on: August 16, 2006, 10:41:55 PM »

dear audioguru,

GUru @ master hehe Grin Grin then do u have any suggestion? and i saw u posting in the arron cake forum too....i can see u help lots ppl there... Grin Grin Grin good jobs haha...i will try to generate my circuit and post it soon....any defects there pls help me to detect... Grin Grin thanks
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audioguru
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« Reply #27 on: August 16, 2006, 10:51:47 PM »

Sketch the circuit of a modified sine-wave inverter and I will check it for you. Don't forget the transformer must have an output voltage about 1.414 times higher than the transformer in a square-wave inverter, to create the peak voltage of the sine-wave. Therefore instead of a 230V to 24V center-tapped (12V-0-12V) transformer you need a 230V to 17V center-tapped (8.5V-0-8.5V) transformer.
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