25 12V-220V Modified Sine-wave Inverter Circuit

This project is a simple 12V to 220V modified sine-wave inverter using 555 timer IC and CD4017 decade counter. This inverter can deliver 300W continuous power and around 500W max power output (short period). A very good  inverter for uninterruptible power supply (UPS).
inverter schematic

The driver of the inverter is the 555 timer and 4017 decade counter. 555 timer generate pulses at a frequency of four times the desired output frequency. For example, if you want a 60Hz output, the timer frequency must be equal to 240Hz (4*60Hz). For 50Hz output, 200Hz is the output of 555.You can try different combination of R1, R2, and C1 to obtain the desired frequency by using the 555 calculator.
The use of LM7809 regulator is to protect the 555 and 4017 from voltage spikes and transients that can influence their operation and stability. You can use LM7808, LM7806, or 7805 regulator or any regulator IC available at hand. But take note that the regulator output must be 5V and above to make sure that you can drive the Mosfet Q1, and Q2. The diagram below is the comparison of modified and pure sine wave. Both have the same peak value and RMS value.

Modified sinewave vs pure sinewave signal
Part List (60Hz, 220V):
R1 - 20 kilo-ohms 1/4W
R2 - 20 kilo-ohms 1/4W
R3 - 1.2 kilo-ohms 1/4W
R4, R6 - 560 ohms 1/4W
R5, R7 - 5.6 kilo-ohms 1/4W
C1 - 100nF capacitor
C2 - 10uF electrolytic capacitor rated 16V
C3 - 470uF electrolytic capacitor rated 16V
C4 - 100nF capacitor
Q1, Q2 - IRFZ44N or similar N-channel power Mosfet
X'former - 10V-0V-10V to 220V transformer (minimum 500VA if required)
LM7809 - IC regulator
LM555 - timer IC
CD4017b - 5-stage Johnson counter
12V - 12V lead acid battery

Diagrams click to enlarge:
CD4017b pins
IRFZ44N pins
555 IC pins
LM7809, LM7808, LM7806, or LM7805 pins
Note: Do not try building the project if you don't have any background in electrical or electronics. 220V output is dangerous and fatal when touched , thus exercise safety always. You can check also the 12V to 120V inverter version if you are living in areas where the main SC line is 120V 50Hz or 60Hz.

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25 comments:

  1. AUTOMOBILEOctober 28, 2011 at 7:59 PM

    Can inverter charge their battery automatically, Assuming the battery is 12v 100ah? If yes, what is the procedure.

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  2. DH-gmOctober 28, 2011 at 10:56 PM

    You can charge other batteries but not the one supplying power to the inverter,

    ReplyDelete
  3. peads92470November 10, 2011 at 3:57 AM

    Can you modify the 12-220V MSW inverter to produce 110VAC? That would much more useful to American mainstream.

    Thanks

    ReplyDelete
  4. DH-gmNovember 10, 2011 at 6:33 AM

    to: peads92470
    Ill modify it for you but for now, if you want to have a 12V to 120V inverter, just replace the transformer to 120V/10V center tap and use the circuit above.
    tnx!

    ReplyDelete
  5. femmyNovember 17, 2011 at 2:46 PM

    what kind of appliance should one run using dis inverter cos i made one using d above method but when i plugged in my soldering iron on it,sounds comes out from my soldering iron.

    ReplyDelete
  6. DH-gmNovember 18, 2011 at 3:24 AM

    I don't know what is the problem but i suspect its the frequency output of the inverter. Try replacing R1 with 50 kilo ohms potentiometer and adjust it so the output is 60Hz or 50Hz.

    ReplyDelete
  7. femmyNovember 18, 2011 at 6:09 AM

    how will i know when d frequency is on 50Hz or 60Hz,i don't have any instrument apart from digital multimeter and soldering iron.can i use 100 kilo ohm potentiometer cos i have one already.and how do i connect it since it has three legs?

    ReplyDelete
    Replies
    1. roger8February 1, 2013 at 9:08 PM

      you can download a oscillascope soundcard to your pc but you need to elaborate your own test probe you can google it an it acts like a voltaje devider.
      regards

      Delete
  8. DH-gmNovember 18, 2011 at 11:05 PM

    Yeah its kinda hard to tell the frequency if you dont have any oscilloscope or any device that can measure frequency.
    I suggest that make sure the values of R1, R2, and C1 are having 1%(the lower the better) tolerance or measure R1, R2, and C2 and make sure that the values are equal of very near to the design above. That is a good way of making sure the output is near 60Hz.

    ReplyDelete
  9. femmyNovember 19, 2011 at 1:57 PM

    thanks,can i use 100 kilo ohm potentiometer for R1

    ReplyDelete
  10. AnonymousNovember 28, 2011 at 8:33 AM

    dis circuit fails to power my laptop,tv wit my 12volt 75AH battery.d only tin it powers is just my 60watt bulb,my ceiling fan ran slowly wit noise coming from it.any solution pls?

    ReplyDelete
    Replies
    1. roger8February 1, 2013 at 9:13 PM

      you need more parallel mosefets like 4 on each side but you need to get a bigger trafo like a microwave oven trafo.
      Regards.

      Delete
  11. Eng islam nagiubJune 24, 2013 at 4:11 AM

    How can i raise this inferter capacity of 300 to 1000 nkw Please reply

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  12. AnonymousJuly 23, 2013 at 11:30 AM

    can i use 12-0-12/600va ups trafo & irf540n mosfet for d above ckt???

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  13. AnonymousJuly 23, 2013 at 11:36 AM

    is this a pwm inverter?

    ReplyDelete
  14. UnknownMay 6, 2014 at 3:27 AM

    My circuit is not working on 10v-0v-10v transformer low power is coming on this. pls help me give me any solution ?

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  15. UnknownMay 6, 2014 at 8:44 AM

    Only 100 v is coming anyone help me pls

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  16. AnonymousSeptember 26, 2014 at 4:58 AM

    I am going to present this circuit, I need someone who will tell me the function of the decade counter and the mosfets on this circuit. please

    ReplyDelete
    Replies
    1. AnonymousOctober 9, 2014 at 7:53 AM

      decade counter is for the ocsilation, and the mosfets will drive the primary sides of a transformer in order to produce alternating voltage (work as a switch).

      Delete
  17. AnonymousOctober 9, 2014 at 7:50 AM

    can I use 9-0-9 to 220 V

    ReplyDelete
  18. UnknownJanuary 6, 2015 at 7:26 AM

    Aoa. I am making it on PCB and I have 12-0-12 to 220v, 5Amp transformer. if i use it please tell me that whose components values will change?

    ReplyDelete
  19. Gayan S. PereraFebruary 2, 2016 at 10:30 AM

    Hello! , what will be the shape of the output after send the modified sine wave through the transformer? thanks

    ReplyDelete
  20. UnknownJuly 5, 2016 at 9:16 PM

    Why do we need transformer of minimum rating of 500W ??

    ReplyDelete
  21. crazymix1978November 4, 2016 at 7:00 AM

    this works in 6v-0-6v ups 800bx trafo..has an output of 220volts exact.. i also use 4 mosfets that came out in ups namely CET CEP93A3 mosfets..my C1 and C4 are both 2A104J mylar caps..so this one is good... i can power up my lcd tv 32" and lightings

    ReplyDelete
  22. AnonymousMay 30, 2024 at 12:42 AM

    I don't get it here where you said it can produce 500w maximum for a short time, and yet on components you indicated 500VA transformer as minimum? reply me at waiyakikanongo@gmail.com

    ReplyDelete

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