How to Convert 12V DC to 220V AC Using IC555 Boost Circuit

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 Description

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

 

How to Convert 12V DC to 220V AC Using IC555 Boost Circuit

 

156 thoughts on “How to Convert 12V DC to 220V AC Using IC555 Boost Circuit

  1. Have questions? Please feel free to post them through comments! Comments will be moderated and solved ASAP.
  2. dear sir, the output is pure sine wave ? can i connect 2 fans (230 volts A.C) ?how can i make the coil? iam going to do this circuit. please help me.

  3. Sir, how many hours can i watch on my 86watts of television if i use and follow your components device? if ever i want to increase the hours what componets can i change?

    • 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)?

  4. Hello Swagatam,
    I have 6 Pl lamps of 15 watt each, and 2 of 26 watt each the total is 142 watt
    I use an ups fed by 12 v 110 Ah battery can the above circuit replaces my ups.
    Best regards

  5. Sir,
    I made a circuit which you shown in figure,in using of bc547 and lm338p….
    but in this circuit output ok is 12.70 v ,but current is 0.01a
    So what i do….
    I want minimum current 10 to15amp…so which circuit i do…

  6. Sir,

    How can I apply this circuit convert 12V DC to 50 V AC , at about 20 milliamp at 1hz per 10 to 20 minutes for an electrolysis project. (so I don't have to swap polarity every 10 min. on a DC battery.)

  7. Hi sir
    We had a innovative since fare project
    So I thaught of doing the circuit
    Sir have u tested it?
    And what is the coil rated
    Please help me sir

  8. Sir,
    Somewhere on the net I came across the information about the coil to be handmade and that would be perfect for this project.
    Toroid Core (T106-2) with 0.8mm wire, 55 Turns for 40uH.
    Could you describ which type of coil you had used?
    What do you suggest???

    Regards,

    • PP, yes hand wound torroidal coils would work nicely here…however I have not yet checked the circuit practically….i would hopefully do it soon.

  9. Sir please is it possible to connect a ferrite transforme between the inductor.if not please how can we do that so we eliminate the regulator part of the circui and use ferrite transformer

    • you may connect the primary of the ferrite transformer in place of the shown inductor, the output then may be acquired from the secondary winding of the transformer.
      but anyway the regulator part would be required for getting a stabilized output.

  10. Sir thank u for your reply.please is it possible to get two frequency output each with different duty cycle at each output with one ic, like 555 or 4049.please help me on how to do it.thank u sir.

  11. Good day sir,please how can we get 50hz from this circuit.thats why iam asking if we can get 50hz from the 555ic so that after the output is rectified we can oscillate it back to 50hz.thank u sir and sorry for my question.

  12. Hello Mister,
    Lately i have been working on a project that requires 400v dc supply. this 400v dc is to be pursed on an inductor to create a strong magnetic field every 0.02 sec. Now, when i try to use a thyristor, it requires a forced commutation circuit which i haven't made. when i use irf840- which is capable of carrying such load, it burns out.
    could the problem of my mosfets burning be as a result of my mosfet driving circuit?
    I can really appreciate if you gave me a possible circuit that can solve my above problem. be it with a thyristor or using a mosfet.
    God bless you.

  13. Hello,

    I want to get 40V-50V output and around 100mamp current out of 3.7 V battery. Can this circuit do this with some modification? if yes please a Hint would be great help.

    Thanx

  14. can i use this circuit for lighting 40W TUBE LIGHT WITH ELECTRONIC BALLAST?

    does the output voltage remain same even after connecting some loads?

    for 40uH how many number of turns of coil should be?

    can i use 100uF/250v in place of 10Uf/250v capacitor?

    thank you.
    Good day sir.

    • yes it can be used.

      output voltage will remain constant if the coil is calculated as per the load.

      i do not have the coil data, you will have to experiment with it.

      100u/250V will be OK.

  15. SM sir, I tried this circuit, the IRF3205 is getting very hot and the wires used to link pins in the bread board gets burned , Pin config of IRF3205, pin 1 connected to pin 3 of IC via 1k resistor, pin 2 connected to inductor out and pin 3 to ground.

    • 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.

    • Sir, i do not have scope to find out the frequency, can i use the DMM? if so how?, ferret core inductor 41uH 00440A

      Pranav BM

  16. Sir,your response pls to my above query,IRF3205 print facing us, 1st pint Gate, 2nd pin Drain, 3rd pin Source.

    Pranav BM

    • Thanks for the input sir, few query
      1. how to use the DMM to test the frequency, what should be the frequency for this circuit.
      2.can you help in understanding an inducted and its config in a circuit.

      Pranav MB

    • 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…

    • thanks sir,
      DMM has the square wave symbol in it.
      I checked all the configuration, however the IRF is getting hot. I shall try one more time reassembling them and let you know the status.

      Pranav BM

    • 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.

  17. 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.

  18. 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.

    • 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:

      https://dl.dropboxusercontent.com/u/20969135/230V%20output.gif

      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?

  19. 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?

  20. 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,

  21. 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
    regards
    andrea

    • 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…

  22. 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?

  23. 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?

    • 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.

  24. 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????

  25. 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…

  26. 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.



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