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How to Convert 12V DC to 220V AC

How to Convert 12V DC to 220V AC

The article explains a very simple method of acquiring 220V AC from a 12v DC source. The idea utilizes inductor/oscillator based boost topology with the help of the IC 555.

We are quite familiar about inverters which convert a DC potential to higher AC potentials at mains levels.
However these units involve complex and expensive configurations for acquiring the required outputs.

A much simpler approach of achieving the above results is by employing a oscillator mosfet boost converter circuit.

If the waveforms are not critical for your applications this method can be a lot simpler and cheaper to implement.

Circuit Operation

Referring to the circuit diagram below, we see that the entire idea is based upon the versatile, evergreen IC 555.

Here it's configured in its standard astable multivibrator mode for generating the required pulses at a frequency determined by the resistors 4k7, 1k and the capacitor 680pF.

The duty cycle may be appropriately adjusted by experimenting the 1K resistor.

The output is received at pin#3 of the IC, which is fed to the gate of an N-channel mosfet.

When power is switched ON, the positive pulses emanating from pin#3 switch ON the mosfet into full conduction.

During the above periods the 12V high current potential is pulled to ground via the coil by the mosfet.

As we all know inductors always try to oppose instant changes in current polarity through it, therefore during the negative pulses when the mosfet remains switched OFF, forces the coil to dump the stored potential in it in the form of high voltage EMF pulse into the output.

This voltage may be equal to 220V and gives rise to the required potential at the shown outlet of the circuit.

The above straightforward operation is repeated continuously at the given frequency providing  a sustained 220VAC at the output.

The BC547 and its base network is introduced for limiting the output voltage to the required degree.

For example if the required output is 220V, the 47K preset may be adjusted such that the220V mark never exceeds, irrespective of the coil back emf rate or the input voltage fluctuations.

The mosfet can be any 30V, 50 amp type, for example a NTD4302 may be used.

The coil wire should be thick enough to hold up to 30 or more amps.

Circuit Diagram

12V to 220V converter circuit

IC 555 Pinout Details

Mosfet IRF 540 Pinout Details

IRF540 pinout details

About the Author

I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials. If you have any circuit related query, you may interact through comments, I'll be most happy to help!

89 thoughts on “How to Convert 12V DC to 220V AC”

  1. Hello Swagatam!
    Can this circuit be used to power the “Cell Phone Battery Charger Station in Villages “(www.homemade-circuits.com/installing-solar-universal-cell-phone/)

      • Swagatam,Thanks a lot.
        would you mind telling me which part and how to adjust the ckt in order to get posibilly more watt out of it?

        • Shigida, you will have to manually experiment with trial and error, and find out which frequency produces the maximum voltage output, once this is fixed then you can replace the coil with a thicker wire coil for upgrading the current capacity of the coil.

  2. If I convert a 12 or 15 or 50v to 230v can I connect this to home appliances if it is possible means please explain it in detail and if not means give the solution to implement the home appliances to it.

    • you can connect appliances which are SMPS based for exmple TV sets, LED lamps, amplifiers but not that require AC sinewave inputs like refrigerators, mixers, fans etc.

  3. I can fool around with the RC timing parts of the ic to get the frequency but can you assist me with the coil, how man turns do you think I would need to get such high voltage.

  4. Can I adjust this to get about 40 to 60khz at about 400v ac?

    If so do you have any idea how much turns I would need on the inductor.

  5. Sir, please, give me a..idea about dc to dc converter from 12volt to 36volt for my 30watt 36volt led chip.because,i have to drive this led light from 12volt battery…

  6. You make a mistake; put a high speed diode after switching.
    If you work with SMPS, high speed diode always needed!

  7. I am trying to tell you that if 150 watt voltage booster inverter is connected to 150 watt battery,without any load or minimum wattage of load on inverter.Then,battery backup depends on inverter rating or load rating????

  8. Sir, if I connect 15 watt cfl bulb to 150 watt inverter with 200 watt battery.Then, how much hours it will keep bright.

    • andrie, you will need to reduce the inductance of the inductor by some trial and error to get 24V at the output….for 24V you can remove the BJT and the zener diode stages which are shown at the output section of the circuit.

  9. hello sir, please i want to make a transformerless inverter (no ferrite core transformer) with 12vdc input and 220vac as output, the wattage should be between 200watts and 500watts. is it possible?

  10. hello sir
    can i use this circuit for charging of a dc input fan?

    wat is the case when the input given 12v battery is discharged?

    can i giv a input to this circuit by 12v rechargeble battery?

    which mosfet i hav to use to this circuit (say the mosfet number)?

  11. Sir you have mentioned that we can use TIP122 instead of NTD4302, then what should be the pin configuration of TIP122? I mean how should I connect the transistor into the circuit?

    • Hi Roney, yes you can used it for charging a laptop from your car battery, the inductor will need to be dimensioned and tweaked appropriately until the required 19v is achieved…

  12. hi iam doing a project in which i need to convert 6v DC to 230v AC . after converting can i use any electrical appliances from the output of 230v AC

  13. hi swagatam majumdar,
    is possible with this circuit to fed an solenoid water valve (7w) as valve of washing machine or an little motor (4w) as flat of wave oven?
    maybe is better to think an inverter circuit more complex as that you have posted in other pages?
    thank you so much

    • Hi Andrea, for a DC application, the above circuit could be used, but for AC devices an inverter would be more preferable.

    • hello nitin,
      please tell me all the technical details of your project, only then i would be able to suggest regarding the above circuit integration.

  14. hello sir nice work…i m planing electrick go kart powerd by sewing machine motor can i use this circuit??
    i have 30ah battery ..sorry for bad english…reply fast..thank u sir….u r genius,

  15. Hi Swagatam

    I am working to use this circuit (excluding the transistor network) as a simple laptop charger from car battery.

    1) One option needs a mosfet with following properties:

    25V, 5A and RDS(on) 3.5 Ohms

    I am not sure if such mosfet is available because such RDS(on) value is for small current mosfets.

    2) The second option is to reduce the input voltage to 6V but, that needs high current regulator.

    Which of these two options is more practical?

    • Hi Swagatam

      As per my usual practice, I have simulated this circuit and got following findings;

      The frequency is 510Hz. If it is decreased to 50-100Hz, the output becomes more than 1kV.

      The inductor is 250µH. The capacitor is 10µF.

      Following is the wave pattern:


      There is one issue i.e. how do we convert it to 230VDC? The CDI capacitor needs HV DC for charging which is provided thru a diode (half wave rectification) but, this output cannot be rectified, neither thru half wave rectification nor full wave.

      If the capacitor value is increased, the output decreases.

    • Hi Abu-Hafss,

      You can experiment with the number of turns of the inductor for getting different voltage levels at the output, because that's the only component that is directly related with voltage boosting.

    • Hi Swagatam

      The out put is sort triangular waves of AC 230V (fluctuating between 0-230V not between 230 and -230 at 510Hz. How do we convert it to DC??? Single rectifier or bridge rectifier is not working, the output remains the same.

      Maybe, the simulator is experiencing some difficulties in performing the rectification. Based on your experience, if you simulate in your mind, do you think the rectifier/capacitor should work to give a smooth DC output?

    • Hello Rashid,

      you will have to modify the coil by experimenting a little with the no of turns and wire gauge until it satisfies the conditions.

  16. Obaid just take out 220V AC, add a step down transformer that makes it 24V and then add a bridge rectifier and two filter capacitors electrolytic 10uF 25V and a 7812 IC, u'll get 12V

  17. Thank you sir, I had tried joule before but the problem is the current supply is not high enough.I need at least 100mA. Can I know how to increase the current or is there any way to do it?

    • Use parallel wire winding, meaning use two or three wires together and then wind them as per the data, this will increase the current of the transformer,also you will have to use more number of cells in parallel for supplying the required amount of current.

  18. Hi Sir, sorry to ask this question here as I could not find a dc to dc step up circuit in your forum. I am thinking is it possible to modify this circuit to step up 2vdc to 12vdc? Thank you.

  19. you can use the square wave symbol range for checking the frequency operation of the circuit…..

    if it's not working with a mosfet you can try a transistor instead, try a TIP122.

  20. Your DMM should have a frequency measuring option, normally indicated with "kHz" symbol, otherwise it won't help.

    In response to the 555 frequency triggering, when the mosfet is in the ON state, the inductor stores the specified amount of electrical energy in it and during the mosfet OFF state reverts it to the output. This back emf from the coil constitutes the 220V at the ouput…

  21. hello again,
    i need to make a just opposite project converting 220v AC to 12v/24v DC help me please or please give me link of the same 🙂

  22. It will be difficult for me to identify exactly how you fixed the mosfet, I hope you've put it correctly.

    What kind of inductor did you use and is your IC generating the required high frequency?? these two factors determine the correct operating conditions for the circuit.

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