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  • 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

    
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    56 Responses to "12V DC to 220V AC Inverter Circuit"

    1. Kuberkoos Kuberkoos says: on August 14, 2013 at 10:19 am

      With the setup as drawn, what would I out be?

    2. Kuberkoos Kuberkoos says: on August 14, 2013 at 7:37 pm

      Anyone measured the efficiency of this circuit,i.e. I Primary at I Secondary? Just wondering…………

      (Noticed that “Krokkenoster” is a member: I would like him to contact me)

      • Given a 42W light bulb as load the DC power consumption was 12V*3.5A = 42W (coincidence) but of course that the light bulb was not lit at maximum. Unfortunately I couldn’t measure the current consumption because my multimeter is kind of stupid, it displayed ZERO… My guess is that the output power was somewhere around 30W (70% efficiency) but I am not sure. Check out the video I have posted in the article!

      • I was able to measure the current consumption of the light bulb (it was set to DC, stupid me) and it was 0.180A at an output voltage or 213VAC. This means 38W at the output which is kind of strange considering the fact that the DC power was 42W, and I think there is no way to get a 90% efficiency out of this dc to ac inverter…

        The second test was with a 60W load and the output voltage dropped to 166V with a 0.277A (46W). The DC was 12V with 5A (this is the maximum of my power supply…) (60W) => 76% efficieny, but I guess the output voltage could have been higher with a more powerful PSU.

      • You can contact him by clicking on its badge and in the opened page click on Send PM button. Here is the link to its profile http://electroschematics.com/qa/user/KROKKENOSTER and here you can send him a PM http://www.electroschematics.com/user-messages/write-message/1591/

    3. Popescu HI! I think your multimeter can only measure DC I made that same mistake especially the “More affordable” kind
      Kuberkoos Your email address is not recognised by gmail. As jy vir my ‘n e-pos wil stuur

    4. Kuberkoos Kuberkoos says: on August 15, 2013 at 5:54 pm

      The few measurements I did on a UPS compared to your measurements indicates that these inverters are less efficient on light loads, (± 50% on a 600VA unit loaded with 100W lamp, and about 65% when loaded with a 250W resistive load.

    5. sir i am novice in electronics but passion to learn. pls do answer my queries.

      my questions are

      1.how push pull mosfet working.
      2.why you connected transformer primary side with with 12 v DC in a center.

      3.why source of both mosfet are connected to IC pin 7,8,9, 12.

      4.it does seem that..The output transformer has a 9V-0-9V, 2 Amps on the secondary and 230V on the primary.

    6. Kuberkoos Kuberkoos says: on August 16, 2013 at 8:52 am

      Mishra, you need to Google “how transfomers work” to undestand the way the transformer is connected. Maybe one of the learned gentlemen who frequents this site can do a better job than me in explaining the working og the rest of the circuit, and understanding that will also clarify the connections of the various elements. Maybe you could also Google push-pull circuits. That should help you to understand.

    7. Hi sir…
      i saw there is a parallel connection between VR 22K and Capacitor 0,22uF in schematic above.. what is the function of it?
      thank you before…

    8. Trui Usman Haryanto Hi!
      Those components appear to be in parallel but they have only one common connection the other two are connected to different pins on the I.C.. They aree the “Time constant” of the multivibrator and as such determine the frequency of the switching transistors and hence the output frequency of your P.S.U. Normal iron cored transformers as a rule do not work properly on high frequencies and some appliances either. With dust cored transformers and coils like those used in computer type switching PSU’s work again more efficient with higher frequencies

    9. whats the ratio of transformer

    10. The output transformer has a 9V-0-9V, 2 Amps

      whats does the term 9v-0-9v shows
      what is the turn ratio of the transformer
      how do u connect third mosfet to get more power

    11. pls Kuberkoos sir tell me
      its my humble request

      that transformer design specification
      how do u decide primary and secondary inductance
      what is secondary voltage and current
      and how will we get 213v AC output

      can u give give me complete details of above transformer design??

      • Kuberkoos Kuberkoos says: on November 9, 2013 at 7:21 pm

        The transformer is a standard 230v primary, 9-0-9v secondary used in reverse. The inductance is only of importance if you wish to wind it yourself. 9-0-9v means this winding is basically an 18v winding with a centre tap.

    12. gantadileepkumar says: on November 9, 2013 at 5:10 pm

      Dear sir,

      My name is dileep kumar.g , your circuit is so nice to work with it, sir I have a doubt,that is how to identify identify the phase and neutral for the transformer, if I want it to connect to my home through inverter wiring.

      Thanking you sir,

    13. gantadileepkumar says: on November 10, 2013 at 4:18 am

      Dear sir,

      I am so happy with your response to my comment, if I connect any one of the terminal of the transformer to my domestic supply neutral point does it make and damage to the system.My intention is to run a ceiling fan with this inverter circuit without any external running of wire.

      Thanking you sir,

    14. sir, can you tell me the exact value[type] of the MOSFET..There are different types of IRFZ44 mosfets are available..pls help me..

      • The MOSFETS used must be able to manage the maximum current your transformer can can supply when used in normal mode.

    15. Maung Pru says: on November 23, 2013 at 4:57 pm

      Sir,
      Can i use a transformer 7.5v-0-7.5v – 220v for this project ?

      I have two of same TR from one 1000va UPS.

      Thank you and with best regards

      Maung Pru

    16. As you are using a 12v battery on the 7,5-0-7,5v windings, the transformer would most probably overheat when used for more than a short period. (You will have to test and check on the temperature.)
      You will have to ensure that the current on the low-voltage side stays within you transformer as well as the MOSFET’s limits!
      And secondly your output voltage will be in the region of 16% higher than it is supposed to be, ±140v for a 120v transformer, or ±260v for a 220v transformer.

    17. Sir,
      Thank you very much for your quick response with valuable advice.
      I have 2 of them, 7,5-0-7,5v. if i use both TR for this project,what should i have to change/re-configure on circuit?

      Thank you once again,

      Maung Pru

    18. Guys I repaired a number of UPS’s and those transformers fitted in the 600 watt units are all 7r5-7r5 volts (The “r” is used in the place of decimal point The problem with these more simple inverters is REGULATION I will have to get the M5 or FBI to hunt for this circuit as I have a ton of books over the years. In one circuit that was published in “Everyday Electronics” and “Elektor” you have another little transformer for feedback that through the drivers turning on harder of softer regulate the output and hence the efficiency. In some circuits I have seen an optocoupler in the feedback circuit
      r is used for units
      k is used for kilo
      m for mega
      g for giga

    19. robert.access says: on January 15, 2014 at 10:36 pm

      Can I use this to power a light from telephone company when GRID is out?

    20. SLOWHANDS!! says: on January 30, 2014 at 4:52 pm

      Hi, sir. .Is possible to connect trans4mer in parallel with a diffrnt ratings?

      • Kuberkoos Kuberkoos says: on January 30, 2014 at 10:00 pm

        Respond to robert.access. Re using telephone co. “power”. The answer is no, your telephone line will not deliver the wattage required to do that.

    21. Kuberkoos Kuberkoos says: on January 30, 2014 at 10:10 pm

      Respond to SLOWHANDS!!: There are many factors that come into play when connecting trafo’s in parallel. The only way to determine if it is possible is to measure the voltage of each transformer at intervals of 10%, 20%, ….. up to 100% load, and draw a graph. If these graphs are identical, you would be able to use them in parallel.

    22. ABDULLA M says: on March 11, 2014 at 8:09 am

      Sirs I Am Abdulla From Kerala INDIA If the Output is given to a fan or a Small Ac motor What Happened ? What are modifications To do for run a AC motor?

    23. Kuberkoos Kuberkoos says: on March 11, 2014 at 6:26 pm

      ABDULLA M: If you mean to run a small motor on an inverter like this one, you will find that the motor is very noisy, it will not be as efficient as on a normal sine wave supply, and on or near full load there would be some overheating. The amount of overheating will vary from motor to motor.
      Be sure to keep in mind that most motors need up to 6 times running current for a very short period to start up. (typically less than a second for small motors less than a few watts.)

      • Abdulla M says: on March 20, 2014 at 8:43 pm

        Sir Will you please a very simple Sine wave inverter?

      • Kuberkoos Kuberkoos says: on March 20, 2014 at 9:12 pm

        I do not think that a “simple” sine wave inverter exists, maybe someone else may have a relatively elementary near sine wave inverter circuit that would do the job.

    24. Abu Rehla says: on April 7, 2014 at 10:26 am

      Which type of transformer? Step up step down?
      How many power at output?
      This transformer is like made by yourself. Please make video of making this circle shape transformer.

      • Kuberkoos Kuberkoos says: on April 7, 2014 at 7:50 pm

        There are numerous sites /videos that explain how to wind transformers. You can Google it.
        The transformer in this circuit is clearly indicated as a 9-0-9v 2A on the low voltage side, iow a 18VA transformer. The hi-voltage side would thus be A= VA/Voltage. You do the math, otherwise you will never learn.

    25. Lakshmipraveen says: on April 15, 2014 at 10:19 am

      Hi sir, how can i change the output wave form of square into modified square or sine wave in an efficient way what is the process? Secondly where should i connect MOSFET’S to increase the wattage for more loads like fan, t.v, and bulbs? I’m awaiting for your reply. Thank you in advance sir.

      • Kuberkoos Kuberkoos says: on April 30, 2014 at 7:44 pm

        1. See my answer to Abdulla M, and
        2. You would need a transformer that can supply the required current, and then you have to replace the IRFZ44′s with other that can handle this increased load. Be sure to upgrade the wiring and install the necessary heat-sinks (if required) if you go this route.

    26. lkz6677 says: on April 30, 2014 at 1:32 am

      Could you add an inductor-capacitor low pass filter on the output to make it be more of a sine wave?

    27. Rohan says: on May 9, 2014 at 8:39 pm

      sir please can you tell me, is it possible to design a ckt which inverts 12v DC to 220v AC( as sine wave as output not square wave)as i want to provide power supply to my laptop or other..hope u reply soon.

      • Kuberkoos Kuberkoos says: on May 9, 2014 at 9:46 pm

        Google “sine wave inverter circuit”

        In my country (South Africa)it is cheaper and easier to purchase a sine or near sine wave inverter than to build one. You should price these in your country, you will find them in stores catering to caravanners or farmers.
        Your laptop should run on a near sine wave inverter or even on a square wave unit. Not necessary for a sine wave unit.

    28. Abu Rehla says: on May 14, 2014 at 12:17 am

      No connection to pin 13 of an IC???
      Leave it as it is???

    29. masood says: on May 26, 2014 at 9:26 pm

      dear sir
      electronic is my top hobby.i have an inverter circuit.iwant to know how i set battery voltage to not extra charge within their limit,other wise the battery will over charge.thanks

    30. hitesh says: on May 28, 2014 at 9:59 am

      Dear sir,

      Please tell me that-

      1. is this inverter used for any type of AUDIO AMPLIFIER CIRCUIT ?

    31. masood says: on May 28, 2014 at 6:56 pm

      may be used

    32. sanjed arfin says: on June 4, 2014 at 8:47 pm

      can i use ups transformer ( 600va ups ) for this inveter…… with 2 mosfet

    33. Santanu Dey says: on July 28, 2014 at 7:49 pm

      Dear Sir,
      I connected a 12v 1.5 amp. transformer instead of 9v 2 amp. transformer, but when i am connecting a light lamp at the output the lamp is not glowing.
      Kindly help me out.

      Regards,
      Santanu Dey

      • Kuberkoos Kuberkoos says: on November 12, 2014 at 8:18 pm

        With the transformer you use there should be an output, you must have a fault elsewhere in your circuit. If you have a multimeter, measure the output voltage. If not near 230v or 120v – depending on your transformer, recheck everything, and if in doubt, remove the MOSFETS and test them. (Google “Testing of MOSFETS” for the method)

    34. what is ribbon microphone?

    35. yassin abbas says: on November 11, 2014 at 9:39 pm

      very good. thank you

    36. Hello sir ,i use 12 volt 5amp bettery and 12-0-12 230 primary 5amp transformer with 2 MOSFET but ckt give 70 volt ac and < 10 watt how i get true 60 watt output.

    37. yassin abbas says: on November 21, 2014 at 12:43 pm

      very good

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