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12V DC to 220V AC Inverter Circuit

This is a quite simple DC to AC inverter that provides 220VAC when a 12VDC power source is provided. It can be used to power very light loads like night lamps and cordless telephones, but can be modified into a powerful inverter by adding more MOSFETs. It uses 2 power IRFZ44 MOSFETs for driving the output power and the 4047 IC as an astable multivibrator operating at a frequency of around 50 Hz.

The 10 and 11 pin outputs of the IC directly drive power MOSFETs that are used in push-pull configuration. The output transformer has a 9V-0-9V, 2 Amps on the secondary and 230V on the primary. Use suitable heat-sinks for MOSFETs.

Remember that this is not a sine-wave inverter, not even a modified one. It’s just a square-wave one so you can power only light bulbs, and small power tools that do not require a frequency with a sinusoidal wave form!

Schematic of the DC to AC Inverter Circuit

schematic of 12v to 220v inverter circuit

132 Comments

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  • wb0sfryahoo-com

    I guess I should have been a bit more detailed with my question. I am Jurassic but do keep up with some current electronics stuff.
    Yes my Fluke is a 179 TRUE RMS and the inverter is a PURE SINE WAVE 5000 WATT UNIT. Well built Chinese unit but no support.
    The aircons require very little starting amps as they are the new inverter units. I have an older Samsung 9,000 btu unit and it runs well even with the low voltage but I don’t want to run it due to that fact.
    Sorry again for being too succinct with my original request so at least I have learned my lesson early to be detailed and not short sheet my inputs.

  • wb0sfryahoo-com

    I am new to the site and signed up for some advice. I retired over 20 years ago and having a problem with my solar inverter. Input voltage is good but output AC is low. I have contacted the manufacturer but they are Chinese and no help so does anyone here have some inputs on where to look for an adjustment to increase 211 VAC to 220+ so I can run my inverter air conditioners. They are voltage sensitive.
    I am limited to test equipment but do have my Fluke which should be enough.
    Assistance will be greatly appreciated and I feel a bit lost with modern tech stuff as I had big boxes full of vacuum tubes when I was in business.

    • KROKKENOSTER

      Sir your Fluke instrument is it true RMS? The problem can be your instrument because an “average reading sine wave” tester you get funny readings but without an oscilloscope you will not really know if the output is sine square or wharever. The airconditioners as far as I know all run with induction motors and if the power is not sine then the will tend to overheat and start the bad habit we all hate SMOKING!! If the transformer is wound like a toroid with fat wire then chances are it is sine . If however it is a bulky then you can bet it is square or “Modified sine”

  • xeranraigmail-com

    i need to convert DC 12V,7.2AH to AC 220V,(1000W-1500W) . please somebody help me with proper information …….

    • mehdipapirgmail-com

      hi i’m mehdi .
      for convert the 12v dc to 220v ac you must convert the 12v dc to 12v ac ( for example us a lm555 ) and next use a transformer 12 to 220 or 6 to 110 to convert 12v ac to 220v ac .

  • gogutu

    Salut marian,pot folosi acest invertor pentru o pompa de recirculare la centrala termica?tank you

    • msgupta54gmail-com

      this is probably Romanian Language and the English Translation will be
      “Hello Marian, this inverter can be used for a recirculation pump to heating? Tank you”

    • kumar-rakesh-itgmail-com

      May I know in which language you have replied.

  • kumar-rakesh-itgmail-com

    This circuit will not work for heavy load. If we use heavy load then mosfet get hot and CD4047 will damage.

    Do you have any idea for protected the IC CD4047 in any type of load.

  • kumar-rakesh-itgmail-com

    Hi,

    In above where the pin 13 of IC4047?

    • kumar-rakesh-itgmail-com

      Thanks for your reply. I have made this circuit and it is working fine.
      My last questions can I use 12-0-12 volt transformer?
      How much maximum dc voltage I can apply on this circuit?

    • T.K.Hareendran

      Pin 13 is the “oscillator output” pin of CD4047 (not required in this project). The output frequency (at 50% duty cycle) at Q and Q outputs (Pin 10 &11) is determined
      by the timing components connected to pins 1-2-3. A frequency twice that of Q is available at the Oscillator Output. Wondering why you switched to this comment box instead of going through CD4047 datasheet available everywhere on internet. The same is also available at the bottom of this article too!

    • kumar-rakesh-itgmail-com

      I meant in above circuit where the pin 13 of IC4047?
      and what is the use of that pin.

  • TheDude

    Where’s the return path to the negative terminal of the 12V dc battery?

  • TheDude

    How do I connect the Varistor and the 12V battery (I’m using a battery), it only shows where the positive side is?

  • naresh purohit

    sir i tested your circuit on bread board their was some humming noise from the circuit , as well a lot of heating due to which breadboard started melting .
    also a sound of beep was their . why it is so ?? can you guided me???

  • sharik

    i am just making a project using yours circuit its a smart power generation i just want few guidience

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