12v DC to 220v AC Inverter Circuit


ByDilip Raja 25

100 Watt 12v DC to 220v AC Inverter Circuit

We all face power cuts in our houses or offices some time or another. At those times we generally use Generator or an Inverter. Power generators use petrol or diesel as fuel and they are noisy. We will not be discussing about the power generators here. Here we will be talking about the Inverter. Inverters drive the power from DC power banks, like lead acid battery pack. These inverters are used everywhere now. This type can be used for medium power applications. But for high power appliances Power generators are most preferred one.

The most common type of inverter we see in everyday life is UPS (Uninterruptible Power Supply). We use UPS to keep PC (Personal Computer) running in the event of power cuts. UPS keeps up the power delivered until battery bank runs out.

UPS is a system which converts DC to AC. So, UPS takes DC power of battery as input and gives AC power as output. Today we are going to build a 100 watt 12v DC to 220v AC inverter. This Circuit is simple and very useful.


Required Components:

  • +12 v battery
  • 47KΩ resistor
  • 1000µF capacitor (2 pieces)
  • 4700µF capacitor
  • 10k pot, 1k resistor (2pieces)
  • 10k resistor (2pieces)
  • In5408 diodes (2pieces)
  • CD4047 IC
  • 4.7µF capacitor
  • Step down transformer (220v to 12v-0-12v (center tap)) (10Amp)
  • IRF540N MOSFET (2pieces)
  • Wires


12v-0-12v 10Amp Step down transformer:

12v-0-12v 10amp step down transformer


IRF540N MOSFET should be used with heat sink, do not use the MOSFET without proper heat sink, without them the MOSFET cannot stand. The MOSFET here is n channel enhancement MOSFET.


Also use some good gauge wire. If you use small gauge wire, you will have losses and under heavy loads they become immensely hot and they will burn out.


Circuit Explanation:

Circuit diagram of 100 watt DC to AC inverter has been given below. We have used EasyEDA to draw this Circuit Diagram, and covered a tutorial on ‘How to use EasyEDA for Drawing and Simulating the circuits’. You can also covert this Circuit Diagram into PCB layout, as we have explained in EasyEDA tutorial, and build this project on PCB.

100 watt 12v DC to 220v AC Inverter Circuit Diagram


Working Explanation:

The core of the circuit is CD4047 chip; this chip here acts as an Astable Multivibrator. So the chip generates clock pulses of frequency 50Hz. This frequency is chosen by capacitor C2 and resistor R1. The time period for the signal is given as:

T = 4.71 R1*C2. 

Now to get frequency (1/T) of 50Hz, we need to play with the above numbers. We can choose capacitance as a constant and play with resistance for appropriate frequency. But if you don’t have an oscilloscope to adjust the pot for the exact resistance, choose capacitance as 4.7µF and resistance as 1KΩ. This gives a frequency of 47Hz, which would do just fine for simple loads. If you want to get exact frequency you need to select the resistance accurately.


So the chip generates the clock pulses, these pulses are taken to N-MOSFET to drive the transformer. The transformer steps up the 12V to 230V. So every time a pulse reaches the MOSFET gate, we will have a 220V half cycle at the output. In the next pulse, the second MOSFET triggers for the second half cycle of 220V. So with two MOSFETS turning on and off at 50Hz frequency, we will have 50Hz 220V cycle output at the transformer end.

So we have made a 12V DC to 220V AC Inverter Circuit.

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  • Ajin Kumar's picture
    Ajin Kumar
    May 25, 2016

    Useful circuit

  • cabbar's picture
    Sep 14, 2016

    what is capacitor voltage range ... c12000u 16v and others? and R1 pot third foot connect ground or empty

  • yaghoobih's picture
    Nov 09, 2016

    very useful circuits thank you dear.

  • Dinesh's picture
    Dec 28, 2016

    I think at the first time output from IC, M2 MOSFET will work not M1,as M1 MOSFET does not work with gate negative.May you tell me about second pulse incoming from output from IC 4047.( Correct me if I am wrong.)
    Please give me response.

  • Bittu Dhali's picture
    Bittu Dhali
    Feb 09, 2017

    It is a good and very useful please send circuit diagram and other details regarding inverter.

  • Shankar tamrakar's picture
    Shankar tamrakar
    Feb 21, 2017

    Please give resistor type and wattage. i guess all are .25w is it

  • Pushpak's picture
    Apr 02, 2017

    any circuit i can built for my 6v battery i mean mini inverter or booster pls
    a simple but effective
    help me ty
    a schematic diagram will work too
    thank you

  • Tapas ojha's picture
    Tapas ojha
    May 13, 2017

    It is a very good clt butwàve is squar wave so this is lightly wrong otherwise it is a good item

  • MABALA BRIAN's picture
    Jul 17, 2017

    Am grateful for this project because we tried it out and it has worked out for us.

  • sidric's picture
    Aug 06, 2017

    I have looked at data sheet for IC 4047 and i think pin 6 is wrongly placed . it should be connected to 4,5 & 14 to run as a free running Astable multivibrator

  • Guru's picture
    Sep 04, 2017

    In 1,2 input which is + and-

  • Guru's picture
    Sep 04, 2017

    Can we use I amp transformer

  • collins's picture
    Sep 28, 2017

    what is the capacitors voltage

  • Ged's picture
    Oct 06, 2017

    I have built similar devices to this one, at higher frequency's. It's an effective circuit, but please be careful chaps, this is still 240volt and can bite you hard if you are careless...

  • Jagath Karunaratne's picture
    Jagath Karunaratne
    Nov 28, 2017

    I want to use this circuit to build a 400 W UPS for my PC. How do I upgrade the 100 W circuit to 400 W please? Which components should be changed?


  • Furqan 's picture
    Dec 08, 2017

    i made this circuit completely at the end output is coming without putting transformer which is 25 volts AC but when i put transformer its output is not coming and battery is getting hot instantley. what to do i am facing very much trouble please leave a note to overcome this problem. square wave is coming out of pins in 4047 . i checked it on oscilloscope . every thing is fine ac is coming but when putting transformer to step up it is making problem.

  • hasnain abbas's picture
    hasnain abbas
    Apr 17, 2018

    circuit is not working m2 is not working what can i do

  • hasnain abbas's picture
    hasnain abbas
    May 13, 2018

    m1 is not working output is not take

  • SHAAHROZZ's picture
    May 22, 2018

    Is this inverter sin wave or square wave?
    Please response

  • Gbenga Odukale's picture
    Gbenga Odukale
    Jul 22, 2018

    This 12v DC to 220v AC Inverter Circuit comes very useful during my search.

  • sagar p's picture
    sagar p
    Sep 07, 2018

    12 v DC conv. into AC and ac work upto 300Khz frqu. rang how it ckt mahe it

  • Hai Truong's picture
    Hai Truong
    Jan 22, 2019

    when i measure the output voltage before the transformer is 25.8V but when the transformer passes 15-0-15V 3A is not out 220VAC. Can you help me? Pls

  • Aswinth Raj's picture
    Aswinth Raj
    Jan 30, 2019

    have you connected any load on the output side? How much voltage are you measuring?

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