Inverters Sinewave

Some of the best square wave and sine wave inverter designs have been presented on this page, specifically designed and researched by me.

But before that you may want to take a peek regarding what a sine wave inverter concept is all about from the following discussion, the later section walks you through the various sine wave inverter circuit links of your choice.

A power inverter system which generates a more than one step sinusoidal AC waveform is known as a sine wave inverter. To more understandably classify the inverters with outputs of significantly less distortion compared to the "modified sine wave" (3 stage) inverter models, the suppliers generally make use of the expression pure sine wave inverter. Practically all consumer range inverters that happen to be promoted as a "pure sine wave inverter" usually do not deliver a gentle sine wave output in any way, pretty much a a reduced amount of choppy output compared to the square wave (a single stage) as well as modified sine wave (three step) inverters. With this perception, the terms "Pure sine wave" or "sine wave inverter" are could lead to confusions to the user who may be interested in buying the system. That said, things may not be that crucial for typical electronics since these contend with the results reasonably nicely..

In areas where power inverter units become equivalents for traditional mains line supply, a sine wave output is most suited owing to the fact that most electronic units get fully optimized to be most useful with a sine wave Alternating current source of power. The customary electrical power supply endeavors to produce an electricity which may be a great approximation of a sine wave.

Sine wave inverters possessing more than than three blocks in the wave output may be considered a bit more advanced and include much higher price if compared to a modified sine wave, having just 3 blocks, or square wave, (single block), variants of the identical power processing. Switch-mode power supply (SMPS) gadgets, which include laptop or computer or DVD players, function on best performing modified sine wave power. AC motors expressly powered on non-sinusoidal electricity may perhaps deliver increased warming, can have distinctive speed-torque attributes, or could possibly churn out additional audible sounds as compared with when working on sinusoidal power.
Modified sine wave

A "modified sine wave" inverter carries a non-square waveform that could be an important close approximation of a sine wave for power translation objectives.

The waveform in commercially existing modified-sine-wave inverters is a square wave with a temporary stop before the polarity reversal, which simply cycles up and down by way of a three-position transfer that generates onward, off, together with inverse output at the pre-determined frequency. Flipping situations are established for positive, negative and zero voltages in accordance with the versions assigned in the switching Table 2. The maximum voltage to RMS voltage never upholds the matching association with regards to a sine wave. The DC bus voltage could also be consciously under control or the "on" and "off" occasions are generally customized to preserve the equivalent RMS significance output up to the DC bus voltage to recompense for DC bus voltage version.

The ratio of towards off period could very well be modified to differ the RMS voltage although keeping up a constant frequency with a strategy generally known as PWM. The produced gate pulses are passed on to each individual switch as outlined by the formulated structure therefore the output is attained. Harmonic spectrum in the output relies on the width of the pulses along with the modulation frequency. With induction motors, voltage harmonics are not of too much serious; but, harmonic distortion in the ampere waveform inflicts significant heat and tend to release pulsating torques.

A great number of electric systems need to work satisfactorily on modified sine wave power inverter systems, most notably all systems that may be resistive by specs for instance an old incandescent light bulb.

Many AC motors like work on MSW inverters with an performance depletion of around 20% because of the harmonic noise presence. But, these tend to be quite crude and noisy. A series connected LC network tuned to the basic frequency looks to be a good insertion..

The following articles provide some of the best sine wave and square wave inverter circuits that you mat select and customize as per your own power requirement specs.

Making a Simple Inverter Circuit - Homemade Circuit Projects
Feb 12, 2012
A very basic and simple inverter circuit can be constructed at home by connecting a couple of transistors and resistors, learn the whole procedure here.

How to Modify a Square Wave Inverter into a Sine Wave ...
Apr 01, 2013
The post explains how to modify an existing square wave inverter to a sine wave equivalent inverter circuit design through simpler means.

Pure Sine Wave Inverter, Using IC 555
Dec 08, 2011
The post explains a versatile pure sine wave inverter circuit which is based on PWM from 555 IC and couple of opamps.

50 Watt Small Inverter Circuit – A school Science Exhibition ...
Dec 08, 2011
A 50 watt inverter might look quite trivial, but it can serve some useful purposes to you. When outdoors, this small power house can be used for operating small electronic gadgets, soldering iron, table top radios, incandescent ...

How to Design an Inverter - Basic Circuit Tutorial
Mar 15, 2013
The post explains the fundamental tips and theories regarding designing an inverter circuit.

Solar Inverter/Charger Circuit for Science Project
Nov 23, 2012
The following article explains a simple solar inverter circuit consisting of it's own battery charger and an automatic changeover relay system for switching the battery to the inverter in the absence of solar energy. The circuit was ...

Pure Sine Wave Inverter Circuit Using IC 4047
Oct 01, 2013
The above pure sine wave inverter design was successfully tested by Mr. Arun Dev, who is one of the avid readers of this blog and an intense electronic hobbyist. The following images sent by him prove his efforts for the same ...

300 Watts PWM Controlled, Pure Sine Wave Inverter Circuit ...
Jan 24, 2013
The following article which discusses a 300 watt pure sine wave inverter circuit, is a modified version of one of my previous posts, and was submitted to me by Mr. Marcelin. Let's learn more about the implementations.

Simple Pure Sine Wave Inverter Circuit - 500 Watt Pure Sine
Apr 27, 2013
The post explains a simple pure sine wave inverter circuit design which can be easily built at home.

Modified Sine Wave Inverter Circuit with Waveform Images ...
Oct 12, 2013
The following post discusses a simple modified sine wave inverter circuit with waveform images, confirming the credibility of the design. The concept was designed by me, the waveform being confirmed and submitted by Mr.

Make this IC 556 Pure Sine Wave Inverter circuit
Dec 27, 2012
The post explains a simple pure sine wave inverter circuit using the IC556 and some other active electronic stages.

Modified Sine Wave Inverter Circuit Using IC 3525, with ...
Jan 05, 2013
The post explains a simple IC SG3525 inverter circuit, equipped with automatic output voltage regulation and a low battery shut down facilities.

Sine Wave Inverter Circuit using Bubba Oscillator
Nov 13, 2014
In this post we learn how to make a simple sine wave inverter using bubba oscillator sine wave generator. The idea ws requested by Mr. Ritwik Naudiyal. The Request Hello Sir!! I am a 4th year B.Tech Student Electrical Eng.

Full Bridge 1 KVA Inverter Circuit Using 4 N-Channel Mosfets
May 20, 2013
The post explains a simple yet effective 1 kva modified sine wave inverter circuit using 4 n-channel h-bridge network.

How to Build a 400 Watt High Power Inverter Circuit with ...
Feb 11, 2012
Interested to make your own power inverter with built in charger? A simple circuit design that can be very easily built and optimized has been provided in this article. Read the complete discussion through neat illustrations.

Single Transformer Inverter/Charger/Changeover Circuit
Dec 13, 2012
An inverter circuit design may be quite incomplete if it's without an appropriate integrated battery charger circuit. Though you may find many inverters having an integral battery charger, the section will mostly employ a ...

Making a Sine Wave Inverter from an Audio Power Amplifier
Feb 12, 2012
You can simply convert a powerful audio amplifier into a pure sine wave inverter, how? Read more.

Making a Pure Sine Wave Inverter - Concept Explored
Feb 12, 2012
The content will throw some light regarding the concept and making of a pure sine wave inverter at home.

Homemade 100VA to 1000VA Grid-tie Inverter Circuit
Aug 19, 2013
The post explains how to make a solar grid tie inverter circuit for home use which can be modified from 100 to 1000 watts as per user preference.

Make This 1KVA (1000 watts) Pure Sine Wave Inverter Circuit
May 24, 2012
The post describes a neat 1000watt or 1kva pure sine wave inverter circuit.

SMPS Welding Inverter Circuit - Homemade Circuit Projects
Jul 06, 2014
The post explains a simple smps based welding inverter circuit which can used for compact welding purposes.

How to Build a100 Watt, Pure Sine Wave Inverter Circuit
Feb 12, 2012
The circuit provided in this article shows you a simple way of building a useful liitle inverter that's easy to build and yet provides the features of a pure sine wave inverter. The circuit can be easily modified for getting higher ...

Sinewave Inverter Circuit Using Arduino
Mar 03, 2015
The post explains a 3 phase sinewave inverter circuit using an Arduino PWM generator board.

5kva Ferrite Core Inverter Circuit - Homemade Circuit Projects
Jul 10, 2014
In this article we diagnose a straightforward 5kva inverter circuit which utilizes a ferrite core transformer and therefore is compact and much efficient.

How an Inverter Functions, How to Repair Inverters ...
Feb 12, 2012
It is rather futile discussing how to repair DC to AC inverter until one becomes fully informed regarding how does an inverter work. The following content walks you through both the aspects which can prove very useful to any ...

Simplest Full Bridge Inverter Circuit
Jan 14, 2014
The post explains how to make a simple full bridge inverter circuit using the IC IRS2453(1)D.

Designing a Grid-Tie Inverter Circuit
Oct 16, 2012
A grid tie inverter works quite like a conventional inverter, however the power output from such inverter is fed and tied with the AC mains from the utility grid supply. As long as the mains AC supply is present, the inverter ...

How to Make a Simple 200 VA, Homemade Power Inverter ...
Feb 12, 2012
An interesting and simple square wave 200 VA inverter circuit is discussed here, you may easily make and use it at home.

Upgrading a Low Power Inverter to a High Power Inverter ...
Oct 23, 2014
The post explains a simple circuit configuration which may be employed for upgrading a low power inverter to massive high power inverter design in the order of KVAs.

How to Make a 500 VA PWM Controlled Modified Sine ...
Feb 12, 2012
A PWM controlled 500 watts modified sine wave inverter has been discussed here, read the whole article for further information. ... Please see at the end of the article, you will find the mosfet inverter diagram. Delete. Reply.

Simplest Grid-tie Inverter (GTI) Circuit Using SCR
Apr 30, 2014
The post explains a very simple grid-tie inverter circuit using SCRs and a few other components.

Compact, Ferrite Core Transformerless Inverter Circuit
Jun 12, 2013
The post comprehensively explains a ferrite cored compact transformerless inverter circuit.


  1. hi m janvi
    How To Make a Cell Phone Jammer?

    1. I will try to cover this topic soon in my blog.

  2. sir how to increase the load regulation in modified sinewave inverter (ic 4017 is used ) ..? actually i am getting 0.90a , 250v output but when i put a 100w load voltage will be reduced seviourly but load works fine , but the problem is i cant connect another 60w load simeltaneously??

    1. please show me the circuit diagram which you have employed...i'll try to figure it out.

    2. i have maild you the driver section of my inverter sir.. because rest of the circuits are same as your design using ic 555 and 1c 4017 (modified sine)..

  3. sir , what is the maximum current dat can be taken by irf 540 mosfet at vds = 24v ?? according to its datasheet it is 5 amps , is it true??

    1. Upto 30 can refer to the datasheet here:

  4. hi Mr. Swagatam im new here i want to know how to bile a 3000 watt inverter simple because i don't know enough about electronic but im very exciting about it & i want to know how to build a 3000 watt transformer (enough small but powerful) please help me.

    1. Hi Rashel,
      you should begin with smaller designs then upgrade them into higher wattage types, I have discussed many inverter designs in this blog, you can select any one from them and start your learning course.

  5. Hi Swagatam

    Here is a schematic of a simple sine-wave oscillator, which oscillates between 0-10v at 50Hz. I was just wondering if we can use a step-up transformer to get 220v?

  6. Sorry, I forgot to attach the schematic. Here it is:

    1. Hi Abu-Hafss,

      The circuit will not handle higher amps and will require an output stage for amplifying amps to the transformer. Moreover this circuit won't generate both the AC half cycles, which makes it ineffective as an inverter.

  7. sir my task was ups as final year project.. but i have made an inverter yet with h bridge of irf3205 its output is a rectangular wave with +12,-12 V 24peaktopeak ... now plz guide me what should i do next for making it modified sine wave and stepping up and filtering :(( plz i need urgent help

    1. Show me the circuit diagram, only then I would be able to say anything.

      upload it to any image sharing site and give me the link.

    2. Ok i m messaging u on ur fb profile ... plzzz plzzz help me ssooon

  8. Hi Swagatam,I want to know that, in my home there is a pure sine wave inverter with a battery.I know how to convert 12 v DC to 230 v AC but I don't know the reverse or charging process that means 230 v AC to charge the 12 v battery.can you tell me the same MOSFET H-bridge used for charging or separate charger used when battery is drained at rated charging point.can you send me the details about it.

    1. Hi Biswajit, you can charger the battery with a separate battery charger circuit through an external voltage source such as from your home AC mains or a solar panel.

      I have published many cool battery charger circuits in this blog, you can select any one from this list:

    2. HI Swagatam,THANKS for your reply.I know your every circuit is awesome in this field.
      I want to know, is there any "possibilities or the process" to use the same mosfet which is used in H-bridge to make dc to ac can be used for battery charging(ac to dc) process in the same circuit board using microcontroller?

    3. Hi Biswajit,

      I am not good with microcontrollers so cannot suggest you anything useful on this.

  9. Hello sir,can you help me with building of LCD display for a mini fuel dispenser?

    1. Hello Segun, Please provide an elaborate description of your requirement.

  10. sir , max Ids of a mosfet decreases as the Vds increases ?? as per some graphs in mosfet datasheet .. ? also practically mosfet burnt as current increased a value shown in datasheet .. ? (irf 540 , max ids = around 5A at vds=24v ) ?

    1. Hi Vishwas, that's impossible, there might be something incorrect in your circuit. You can test the mosfet separately using a, say 20 amp 50V lamp or any other value below the specified rating, the mosfet will not burn..

  11. oh ok.. so we can use 8 amp 500v mosfet in a 340v h bridge ciruit with a load of 2 amp safely??

  12. ok thank u.. sir i have mailed u some graphs fom mosfet datasheet can you analyse it and tell me what they mean ?

    1. The left graph shows the safe operating area of the mosfet. The y-axis shows the max current that should not exceed over the dotted line on the top. The x-axis shows the max voltage that should not exceed beyond the thick dotted line at the right side of the graph, while the Vds voltage which lies on the right hand side of the thick dotted line can be applied only as a short pulse whose duration is indicated along the vertical thick dotted line.

      The right hand side graph simply shows the current/voltage response of the mosfet across its drain/source when Vgs or gate voltage = 10V

  13. ok.. now now i have some quetions , irf 840 mosfet is rated as 8amps , 500v , but when we observe the graph,,, at vds=500v , max allowable DC current is about 0.3 amps(FROM THE GRAPH) , so can i say that 8 amps can be passed in pulse but not continuesly , continuos current of only 0.3 amps can be passed??

    thank you for your time,

    1. No, may be you are reading the graph wrongly, it doesn't show anything like that,
      the thick vertical line at the right shows the voltage limit after which it could applied only as pulsed voltage as given beside the line.
      The left slope indicates the current response with respect to voltage, whereas the upper white space indicates the danger zone or the restricted area for the current.

    2. ...8 amps can be passed continuously albeit with heasink on the moset

  14. can we use am radio ferrite core for high frequency inverter purpose? arround 250 W?

    1. it won't produce efficient results, because the core should be a looped type as in E-cores or in torroidal cores for getting efficient outputs....

  15. Hi Mr. Swagatam,

    i have a defective 2kva ups, i want to salvage the transformer (48v no center tap 110v ouput), please make me a design using this transformer, and i have also mosfet ifr3205, incorporate this if possible...

    thank a lot.


    1. Hi Mr. Ariel,

      You can try the following design:

    2. Hi Mr. Swagatam,

      Thank you and i appreciate your design, but IC IRS2453(1)D can't found in electronic shop.

      Can you please make an alternative circuit using NE555 and 4017, or 4060 for oscillator driver..
      option 1 using 4 n-channel mosfet, option 2 using 2 n-channel and 2 p-channel mosfet..

      Thank you for your immediate response.

      Thanks a lot


    3. Hi Mr. Ariel,

      The circuit that I have referred is a professionally designed circuit and will start working without any hassles, other modified designs may not be so reliable,
      if you insist, the following circuit may be tried, which has been designed by me

    4. Hi Mr. Swagatam,

      Thank you for your immediate response. By the way, What type of regulator to be used to supply the VCC of IC 4049 and 4017? my Battery Voltage is 48v in series, or maybe I use one of the series battery so that i can feed 12v to IC and 48v is feed to mosfet and the ground are common. My existing mosfet is IRF3205, is suitable for this circuit?.. What is the oscillating frequency so that i can produce 60hz from the output Transformer?

      Thanks a lot Mr. Swagatam,



    5. Hi Mr. Ariel,

      You can use a 7812 IC for powering the ICs
      48V will work for the mosfets separately.
      IRf3205 is OK.
      oscillating frequency could be 600Hz at pin14 of 4017

    6. Hi Mr. Swagatam,

      The circuit is work fine on 12v dc supply. But when i connect on 48 volts dc supply, the pnp transistors (bc557) blows out. Please help me to trace what happen.. is this exceed the Vec of BC557 because the bootstrapping network?

      Thanks a lot Mr. Swagatam,



    7. Hi Ariel,

      the 4049 IC will surely need 12V supply and not you must apply the 4049 IC also with 12V from 7812 IC.

      48V will only go to the high side mosfet drains and must be suitably dropped before applyuing to the ICs.

      and yes 7812 cannot be used with 48V since these ICs can handle not more than 35V input.

      You can use a BC546 as an emitter follower with 12V zeer at base for getting the required 12V supply.

    8. Hi Mr. Swagatam,

      I just want to clarify that the diode (1n4148) across the positive terminal to the output of bootstrapping network. The anode terminal is connected directly to the battery even if the supply is 48 volts?
      And also the capacitor is connected directly to the ground terminal.

      Thanks a lot Mr. Swagatam



    9. Hi Ariel,

      I have updated the discussed diagram appropriately, you may refer the same for getting a clearer view.

  16. hi,
    I hope you watched the channel- lasersaber.
    Well, I wanted to know a bit of trade language in electronics(how we ask a components name in shop).
    I went to a shop and asked a transformer "120v-12v, 40va transformer(stepdown)". The shop keeper asked what does va means??
    I told him "Volt-ampere", then he said, he dont know.
    So can you say what exactly i should ask for the above mentioned transformer in trade language.??????

    1. Hi,
      If the CFL is rated at 12 watts it WILL consume 12 watts for the specified illumination, if anybody claims to produce the same illumination at a lower supply power the person may be completely faking....there are many such fake claims presented on Youtube so please don't trust them.

      Tell the shopkeeper that you want a 120V, 12V/3 amp transformer he would now surely understand

    2. Helped me a lot,

      with regards.

  17. Hi Mr. Swagatam,
    i hav 3055 tr old inverter. it can fractuate output in Changeover to solve this problem...??

    1. Hi Sovan, I am sorry I did not understand your requirement, please explain it more clearly.

  18. Hi sir,
    I build an inverter using ic 3524, the inverter is working fine on some appliance but won't power a small standing fan and a small clipper. Pls what can I do?
    Thanks in advance

    1. Hi Kolley, the fan wattage could be beyond the capacity of the inverter power that's why it's not able to move may have to increase the battery AH and/or the transformer amps for upgrading the inverter range

  19. Hi,
    Do you have any ideas on implementation of complex PWM techniques like Space vector or harmonic elimination techniques in Multilevel inverters using microcontrollers?

    1. Hi, it can be done using ordinary discrete components, MCU may not be required, I had seen one nice article on this but find out now, I'll try to locate the pdf and post it in this blog for your reference. I have no idea how to do it with MCUs.

  20. Hai,
    I want to make a circuit to generate missing phase from 2phase in 3phase.beause in my area some times 2 phases are avilable.3rd is not.
    The 2phase voltages are 230 and 190,from phase to nutral
    Please provide the circuit with thyristors are .mosfers for 5kw.
    I hope you will help us.
    Thanking you sir.

    1. Hai, I'll try to design it and post it soon for your reference.

  21. Dear,
    I've recently purchased a frequency meter for the ease of making my projects.
    what i wanted to know was if use the meter to confirm the mains frequency, could i use a resistor in series with the meter just for added protection,
    here i wish to exercise caution while in such measurements cause the meter was quite expensive, meter has a single dial for freq. upto 200KHz.
    for the resistance, what value according to you should i use to measure the freq. safely?

    1. Dear Sherwin, you can use any high value resistor, although the meter already has one can use a 100K resistor for example.

  22. Dear,
    The low power inverter circuit diagram that uses 4047ic and two mosfets, was successfully done by me and i got the results in the first shot itself.
    transformer i used was 12v cen.tap 5a.
    I have one question about 4047 ic;
    now that the output pins 10,11 are half freqs, to make them a single output and get a full waveform at the output,
    what came to my mind was that could i pass the 10,11 outputs to the outer taps of a center tapped inductor,
    with suppose 10+10 turns of solid wire, and take the output from the centered tap,
    is this correct?
    will i get a full frequency waveform at the output?

    1. Dear Sherwin,

      what you are getting from your 12-0-12V transformer output is a full wave AC so there's no need of any other modification in the design, moreover the IC4047 outputs are too weak and are not specified for handling transformers directly, that's why power devices are employed with the outputs of the IC for driving the transformer.


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Readers are advised to proceed with the construction of the presented circuits only after understanding the concepts from the core. Not adhering to this can lead to failures and frustrations.
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