All About Circuits Forum Pure sine wave inverter
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#1
07-19-2009, 02:17 PM
 jeffwong New Member Join Date: Jul 2009 Location: Malaysia Posts: 9
Pure sine wave inverter

I have a Pure Sine Wave Inverter design circuit diagram, but the output is too small, which is 120Vac from 12Vdc input.My desire output is 240Vac from 12Vdc input. Please give me some advice that how i can modify the circuit to increase the output voltage ?
The supply voltage to the Mosfet(VDD) is 170Vdc, this make me difficult because the power supply input to the inverter is only 12Vdc. What can i do so that i can supply 12Vdc instead of 170Vdc to the Mosfet?
Attact with the circuit desig diagram.

Thanks........
Attached Images
 Inverter.gif (50.7 KB, 319 views)
#2
07-19-2009, 02:34 PM
 beenthere Senior Member Join Date: Apr 2004 Location: Missouri, USA (GMT -6) Posts: 15,815 Blog Entries: 10

The inverter's output will have to be applied to a transformer for the output voltage increase. For a 240 volt output, the transformer will have a greater number of turns in the secondary than a transformer that gives a 120 VAC output.

Are you aware that the power out of an inverter is a product of voltage and current? That same power must be driven in the transformer input from those 12 volt batteries. For a 1000 watt output and no losses (not possible), the batteries must supply 83.3 amps of current.

For a square wave inverter, the drivers can be switched very quickly so they do not heat. For a sine wave inverter, the ohmic heating becomes a major problem. That means more drivers in parallel, huge heat sinks, and, probably, fans to control the waste heat.

I am not sure what your circuit will do - it is too small to read.
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#3
07-19-2009, 03:24 PM
 millwood Guest Posts: n/a

with that particular topology, your output is limited to Vdd. if you want higher output voltage, you should look for a different topology, for example, flyback.

with a flyback, you can power both Vcc / Vdd from 12v and output 240v.
#4
07-19-2009, 04:18 PM
 Bill_Marsden Super Moderator Join Date: Mar 2008 Location: Dallas, TX (GMT-5 w/ DST) Posts: 19,044 Blog Entries: 5

Just to make it a little easier to read, I rotated it.
Attached Images
 temp.PNG (73.2 KB, 232 views)
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General info:
If you have a question, please start a thread/topic. I do not provide gratis assistance via PM nor E-mail, as that would violate the intent of this Board, which is sharing knowledge ... and deprives you of other knowledgeable input. Thanks for the verbage Wookie.
#5
07-20-2009, 08:35 AM
 jeffwong New Member Join Date: Jul 2009 Location: Malaysia Posts: 9
Pure Sine Wave Inverter

Im not like to use transformer, i would like to modify the circuit design. What can i do in this circuit design to increase the output voltage from 120Vac to 240Vac output?
The inverter will use in household, mostly will use car battery to supply the 12Vdc to the inverter.
If i want to increase the output voltage, am i need to incease the supply voltage to the Mosfet(VDD) ?
What software have the Mosfet Driver component so that i can do simulation?
#6
07-20-2009, 08:37 AM
 jeffwong New Member Join Date: Jul 2009 Location: Malaysia Posts: 9
Pure Sine Wave Inverter

Dear millwood:
What is flyback?
Is that one type of Inverte. Could you send me a circuit diagram to me?

Thanks.......
#7
07-20-2009, 08:41 AM
 jeffwong New Member Join Date: Jul 2009 Location: Malaysia Posts: 9
Pure Sine Wave Inverter

Dear Bill_Marsden:
Izit the circuit diagram very blur?

Thanks..........
Attached Images
 Inverter Circuit Diagram.gif (50.7 KB, 149 views)
#8
07-20-2009, 12:37 PM
 Bill_Marsden Super Moderator Join Date: Mar 2008 Location: Dallas, TX (GMT-5 w/ DST) Posts: 19,044 Blog Entries: 5

Quote:
 Originally Posted by jeffwong Dear Bill_Marsden: Izit the circuit diagram very blur?
No, the schematic is quite good. But when I trace something like that I start from my left and go right. Most schematics do. Going up and down feels unnatural. It's a personal preference, but one shared by many people.
__________________
..
"Good enough is enemy of the best." An old engineering saying, Author unknown.

General info:
If you have a question, please start a thread/topic. I do not provide gratis assistance via PM nor E-mail, as that would violate the intent of this Board, which is sharing knowledge ... and deprives you of other knowledgeable input. Thanks for the verbage Wookie.
#9
11-06-2009, 10:51 AM
 ezeebube New Member Join Date: Oct 2009 Location: Lagos,Nigeria Posts: 7

Hey guys,considering the schematic posted by Jeffwong,how can this circuit be connected to a transformer?Will the two outlets from the two IR2110 ICs be used as signals to Mosfets?(I'm considering how it is done in a square wave version)Do you think that this diagram is perfect?Please i need your answers.
#10
11-06-2009, 12:18 PM
 beenthere Senior Member Join Date: Apr 2004 Location: Missouri, USA (GMT -6) Posts: 15,815 Blog Entries: 10

The circuit is very incomplete, so who can say if it is functional? You also have another thread open on this topic.
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First comes the hardware, then the software.

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