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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

﻿

### 116 Responses to "12V DC to 220V AC Inverter Circuit"

1. Kuberkoos says:

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

• Maximum 20 watts. You can connect more MOSFETs in parallel and change the transformer to get more power.

• luthson2002 says:

Hi Marian.
About the “12V DC to 220V AC Inverter Circuit”
Please, if I put 4 mosfets (IRFZ44) in parallel (8 in total), which valor of the transformer will I use?
Regards

• amar patel says:

12 volt dc convert to 220ac

• amar patel says:

how to conect the components

2. Kuberkoos says:

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/

• nitesh patidar says:

sir’
if you have circuit diagram for DC to AC converter so please send me i have need that converter and i want to make
specifications: voltage input = 12 V DC
voltage output= 230 V AC
current= 4.6 A output
power = 50 W

• pepesoup says:

Dear Marian,
I want to know how to determine the actual output current of the secondry winding of a Transformer if the voltage is known.
Thanks and looking forward to hearing from you.

• pepesoup says:

Dear Kuberkoos,
for example i have a transformer that is 12-0-12 volt to 220 volt that was winded locally in my country, by my specification of 1000va but i am not really sure if it was properly done thats the reason am asking.
In a null shell, i’m thinking of connecting a load on the output (like Bulb or any thing) while i measure the current in series in between one of the cable cenected to the load.
Sir i dont know if the current can be determined through this method.
Thanks and looking forward to hearing from you.

3. Popescu HI! I think your multimeter can only measure DC I made that same mistake especially the “More affordable” kind

4. Kuberkoos says:

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. mishra says:

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 says:

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.

• mishra says:

ok..sir

• mishra says:

Dear sir
pls give me ur valuable time
i tried but i did not get my ans satisfactorily. it hardly takes few time but it makes sense for me..

• anas ali says:

sir,
am anas ali frm kerala…. i need to know about..yesterday i seen a inverter..its include 2 transformers.whats this fact

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. vikram says:

whats the ratio of transformer

10. mishra says:

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. mishra says:

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 says:

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.

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,

• Kuberkoos says:

As none of the output connections is earthed, none can be described as ‘live’ or as ‘neutral’.

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,

• Kuberkoos says:

Be very careful not to connect this circuit in parallel with your mains supply. The results could be disasterous

14. ashik says:

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

• Kuberkoos says:

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:

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. Kuberkoos says:

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. Maung Pru says:

Sir,
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:

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

20. SLOWHANDS!! says:

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

• Kuberkoos says:

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 says:

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:

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 says:

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:

Sir Will you please a very simple Sine wave inverter?

• Kuberkoos says:

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:

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 says:

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:

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 says:

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:

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

27. Rohan says:

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 says:

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:

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

29. masood says:

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:

Dear sir,

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

31. masood says:

may be used

32. sanjed arfin says:

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

33. Santanu Dey says:

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 says:

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. shivani minhas says:

what is ribbon microphone?

35. yassin abbas says:

very good. thank you

36. hardik says:

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:

very good

38. Aleksandar says:

What if i make secondary coil 12-0-12V
And my scheme is with IRF540..Please see the picture and tell me..

• Did you test your circuit, is it working properly?

39. Aminu Auwal says:

Please can I use hcf4047be ic

• Alfinso Rizolli says:

you can use any ic. you can even use 555 to get your vibration frequency right. you need to check the IC datasheet and set the components right to get the frequency that you want make.

• pepesoup says:

Dear Marian,

I will like to know the quantity of MOSFETs that will be needed to drive a particular tranformer of 12-0-12 volt DC to 230 volt AC. iS There any special calculation for this?

Secondly, i want to know how to determine the actual output current of the secondry winding of a Transformer if the voltage is known.
Thanks and looking forward to hearing from you.

40. Alfinso Rizolli says:

hello. Question please. thanks in advance……. i intend to drain more ampere of the input battery. so making 4 sets of mosfets in parallel for each side of the primary winding….. this is how i THINK i should paralle them…. picture is attached…. am i right? thanks.

• Kuberkoos says:

Your drawing seems fine, be sure to upgrade your transformer as well as the wiring to cater for the increase in current.

• Alfinso Rizolli says:

thanks. and what about the other mosfet i sent its datasheet as pdf in other message? does it look ok? i think two of them in parallel, is good enough for each side of the transformer to give me 100 amp drain from battery. ….. i use a microwave oven transformer. rewired the original secondry and use it reverse.

41. Alfinso Rizolli says:

hello….next question…. is mosfet can give me 53 amp…according to its data-sheet making two of them for each side parallel will drain 100 amp from the battery that looks good enough to me when I use a large transformer. what do you thunk about that? thanks. here is the datasheet ….. http://www.vishay.com/docs/68633/sup53p06.pdf

• Kuberkoos says:

The wire on your 12-0-12v winding must be thick enough to handle 100A, Your Mosfets must be mounted on the correct size heat sinks, The wiring from your battery to the Mosfets, and from there to the transformer must be able to handle the current.
Your output current could – theoretically – be as high as 12×100/230 = 5A at 230v. With resistive, transformer and other losses, you could look at about 4A max.
This of course if your transformer is 1200 VA or bigger.

42. carlito says:

connected the circuit as shown from schematics, using primary side of transformer connected to ac side, while 2 sides of secondary have went to to live and earth and between the two d sides of the mosfets. Once dc supply is connected no out out flows from the ac side.

• pepesoup says:

Dear Carlito,

I will like to know the quantity of MOSFETs that will be needed to drive a particular tranformer of 12-0-12 volt DC to 230 volt AC. iS There any special calculation for this?

Secondly, i want to know how to determine the actual output current of the secondry winding of a Transformer if the voltage is known.
Thanks and looking forward to hearing from you.

• Kuberkoos says:

You need to know the VA rating of the transformer. From there you can calculate the max current possible in both Hi and Lo voltage sides.
Using the Lo voltage side current as well as the current the Mosfets can handle, you can calculate the number of Mosfets you need to supply the transformer on max load.
Keep in mind that the max current rating on the datasheet is quoted for when the Mosfet is mounted on a suitable heatsink.

43. subash says:

Sir
I want 12v dc- 230v ac converter circuit
Specification input DC -12v
Output ac -230v
Amper-6A
Power-250w

44. Shrikant says:

sir send mi the pcb layout of the ckt

45. I have question if I use 12 vlot pure DC as input for this circuit.is cd4047 will give 50Hz frequency. The ic generate frequency depend upon resistor and capacitor value.In pure DC frequency is zero.The resistance of resistor will dependent on frequency and The capacitor also depends frequency for charging and discharging.plz tell me iam searching answer for this too many days

• Kuberkoos says:

The CD4047 will with the assistance of the resistor and the capacitor generate the calculated frequency.

46. sweden says:

Sir, in the the project inverter using MOSFET;;we have used 4Mosfets and corresponding MOSFET output we obtain is 26V and output at the load we obtain is 386V AC…….so can u tell me the best way to reduce output voltage from 386V to 230V ac……waiting for ur reply sir….

• Kuberkoos says:

Is your transformer the correct ratio? (12-0-12 to 230V)

47. sethu says:

Hi sir,
what is the design procedure behind the selection of resistors and capacitors for this inverter?is there any equations for that?plse reply…

Hello sir,
The same inverter i have designed for 12vdc to 230vac, i failed to get the output of 9 volt on drains of MOSFET. suggest me the solution.
And how to make it for sine wave.
Below is the circuit diagram of inverter on which i have worked.

49. hi sir. I used 200 ma trarnsformer instead of 220v does i can run celing fan with this transformer

• Kuberkoos says:

We need the current rating as well as the voltage rating (or voltage and VA rating) to be able to do any calculations on the transformer

50. hi sir. I used 200 ma trarnsformer instead of 220v does i can run celing fan with this transformer.sir plz i am waiting for your fast rply

51. Chinedu Aniemeka says:

Thanks

52. pepesoup says:

Dear Kuberkoos,
I will like to know the quantity of MOSFETs that will be needed to drive a particular tranformer of 12-0-12 volt DC to 230 volt AC. iS There any special calculation for this?
Thanks and looking forward to hearing from you.

53. pepesoup says:

Hello all,

I will like to know the quantity of MOSFETs that will be needed to drive a particular tranformer of 12-0-12 volt DC to 230 volt AC. iS There any special calculation for this?

Secondly, i want to know how to determine the actual output current of the secondry winding of a Transformer if the voltage is known.
Thanks and looking forward to hearing from you.

• Kuberkoos says:

The number of Mosfets is determined by the current flowing thru them. E.g. if your primary current is 100A ,and your Mosfets can handle 35A each you need at least 3 in paralel.
Your theoretical output current is determined by the VA rating of the transformer divided by output voltage.
This output current can only be obtained if your batteries as well as your Mosfets can supply the necessary primary current. (VA rating divided by primary voltage.)

• Kuberkoos says:

You will notice that any item (like a bulb) is rated for a certain VA rating or wattage. When connected to a power supply it will draw only the current it was designed to. Let’s say you connect a 220v 100W lamp to your 220v transformer, it will draw 100/220= 0,4545A. So that will not help you at all.
If you specified the transformer to be 1000VA, then the max output current should be ±4.545A, ao the output, the input current on the 12V side will be 1000/12=83.3A. Right so far?

54. Paul says:

Sorry Kuberkoos, suppose i need 25kva as an output from the circuit, what requirements do i need so as to reach 25kva as an output power from the circuit you posted

• Kuberkoos says:

Are you sure you want 25kVA out?? That comes to about 100A out, which means about 2000A on the input????

55. Luthson says:

Hi Kuberkoos.
About the “12V DC to 220V AC Inverter Circuit”
Please, if I put 4 mosfets (IRFZ44) in parallel (8 in total), which valor of the transformer will I use?
Regards

56. DEBANJAN MITRA says:

I have done this circuit, and work perfect, but at vcc and gnd pin is over heated and its burned the battery wire. I used 6 V 5.5 Ah battery. Have any suggetion sir? Plz help me.

• Double the thickness of your battery cables. They must be at least 5 mm squared Uour supply cables are too thin at least use thrre wires per battery wires if you have on hand

57. Paul says:

Yes kuberkoos I’m serious about that…. I need a homemade higher power inverter…. I need your help sir

58. Rafaqatali says:

hallo sir how are u I need halpe sir I want to maka a tarnsformer 12v 220 v I maka new tarnsformer rewind how maka to rewind plz explina sir

59. Mahfuz ahamed says:

Tnx friend & also Sir. I don’t know anybody but ur comment very useful for me

estimado, quiero realizar este circuito en el programa “FRITZING” , me puede ayudar con los pasos a seguir porfavor…

61. Sir, can I summarize this as saying literally inverting a 12v adapter by reversing the Ac as my output and Dc as my input?

• Yes u are correct

62. maignanam says:

what is the backup of the 12vdc battery using 220v ac and there is a possible to run a celing fan.

• For any induction motor you must use a SINE WAVE inverter and this baby”s output is unsuitable being square wave

63. Dare Diamond says:

Hello Kuberkoos.

Please may I know if this circuit can bé used to power A Voltage Multiplier Circuit irrespective of the output wave bé it pure sine, squre, modified etc.?

• Yes it will work better than pure sine wave

• Dare says:

Thank you so much sir.

Please how can I integrate the above circuit with this one here to power my said capacitor and diodes made Voltage Multiplier => http://www.homemade-circuits.com/2014/01/automatic-output-voltage-regulator.html ?

Please sir, I am not trained in Electronics but when I see a simplified Circuit like in the one in the attached picture, I can soldier things correctly.

Also, how can I reach you through Email?

64. Dare says:

Also,after changing the Transformer to 500W one 12V 41A, what else will I need to change in the Circuit to get the desired output wattage?

65. To be safe I would recommend at least 24 volts! But if you have to use 12 volts input the supply must be 60 amps and this will need 6 six 10 amp mosfets per side that is 12 twelve total to drive that job!!!You need a BIG battery for this job electric forktruck battery!!!

66. Paul says:

Can 600 watts inverter be changed to 3 kilowatts??

• Not easily you will need at least 48 volt batteries and the transformer will be larger than an old type oil cooled welding machine that can supply welding current for 4millimeter welding sticks!!!The transistors or mosfets will have to be BIG and about thirty per side to be safe!! Basically the inverter will be the same working but you will have to have proper protection circuits as the basic circuit will not last. I would do the phase splitting not with that little IC but a special transformer that itself will be quite big and there I would employ a driver of about 20 watts to drive the bases of the output devices. Remember that it will consume more power to drive itself than what we normally will assume.

67. Paul Richard says:

Ok but i would like to know if 600 watts inverter be enough to power 32″ LED TV, one standing fan, two tubelights, music system, phone charging system??

68. Maksud says:

please information me how can i will make dc celling fan 48″.
i don’t know about circuit and copper motor

69. sharik says:

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

70. naresh purohit says:

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???

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