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You are here: Home / Inverter Circuits / 1500 watt PWM Sinewave Inverter Circuit

1500 watt PWM Sinewave Inverter Circuit

Last Updated on August 3, 2020 by Swagatam 134 Comments

A vey basic yet reasonably efficient 1500W PWM based sinewwave inverter circuit can be studied under this post. The design utilizes very ordinary parts to accomplish a powerful SPWM type inverter circuit.

Main Specifications

Power Output: Adjustable from 500 watts to 1500 watts

Output Voltage: 120V or 220V as per the transformer specs

Output Frequency: 50Hz or 60Hz as per requirement.

Operating Power: 24V to 48V

Current: Depending on the Mosfet and transformer Ratings

Output Waveform: SPWM (can be filtered to achieve a pure sinewave)

The Design

The proposed 1500 watt PWM sinewave inverter is designed using extremely basic concept through a couple of IC 4017 and a s single IC 555.

In this concept the sequencing logic from the output of the IC 4017 are configured by selecting and skipping subsequent pinouts such that the resultant sequencing produces a decent SPWM like switching on the connected mosfets and the transformer.

The complete schematic could be visualized in the following diagram:

SPWM 1500 watt inverter circuit

The working of the Inverter can be understood from the following explanation:

Circuit Operation

As can be seen, two IC 4017 are cascaded to form an 18 pin sequencing logic circuit, wherein the each negative pulse or frequency from the IC 555 produces a shifting output sequence across each of the indicated outputs of the two 4017 ICs, starting from pin#9 of the upper IC upto pin#2 of the lower IC, when the sequence is reset to initiate the cycle afresh.

We can see that the output of the IC 4017 are intelligently tapped by skipping and combining sets of output pinouts such that the switching to the mosfets achieves the following kind of waveform:

SPWM image from IC 4017 inverter

Acording to the waveform, the start and the end sequences can be seen being skipped by eliminating the relevant pinouts of the IC, similarly, the second and the  6th pinouts are also skipped, while the second, 4rth, 5th, 6th pinouts are joined for accomplishing a decent SPWM like pulse form across the outputs of the two 4017 ICs.

Video Proof (100 watt example)

The Objective behind this Logic Configuration

The above shown waveform is selected so that it is able to replicate the actual sinusoidal or sine waveform as closely as may be possible.

Here we can see the initial blocks are eliminated so that the SPWM waveform can match the actual sinewave's initial lowest RMS value, the next two alternate blocks imitate the average rising RMS within a sinewave, while the center 3 blocks tries to replicate the maximum RMS of an  exponentially rising sinewave.

When the above PWM format is applied to the gates of the mosfets, the mosfets alternately execute the switching of the transformer primary with the very same switching format in a push pull manner.

This forces the secondary synchronously to follow the induction pattern with an identical waveform which ultimately results in the creation of the required AC 220V, having the above SPWM waveform pattern. An appropriately dimensioned LC filter across the output winding of the transformer may finally allow the secondary side to achieve a perfectly carved sinusoidal waveform.

Therefore when the resultant output of this SPWM is filtered should hopefully result in the replication of a sinewave output which could be suitable for operating most electrical appliances.

The Oscillator Stage

An ordinary IC 555 astable is implemented here for creating the required clock pulses for feeding the cascaded 4017 ICs and for enabling the sequencing logic across their output pinouts.

The R1, R2,and C1 associated with the IC 555 must be accurately calculated so that pin#3 is able to generate around a 900Hz frequency at around 50% duty cycle. A 900 Hz output becomes necessary so that the sequencing across the total 18 pinouts of the 4017 ICs causes the BJTs to trigger at a 50 Hz across the two channels, and at around 150 Hz for chopping the individual 50 Hz blocks.

About the Mosfets and the Transformer

The mosfets and the transformer of the above explained 1500 watt SPWM inverter circuit are the two elements which determine the total power output. For getting a 1500 watt output make sure the battery supply is not less than 48V, at 500 Ah, while the transformer could be anywhere around 40-0-40V/ 40 amps. The mosfets can be  IRFS4620TRLPBF each if 48V battery is used, a pair of these mosfets would be required in parallel on each channel for ensuring proper delivery of the full 1500 watts at the output

If you have any doubts or personalized queries, please feel free to add them in the comments below for getting quick pertinent replies.




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About Swagatam

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!

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  1. Search Related Posts for Commenting

  2. BABURAJ says

    Hi, I am looking at High efficient 1500W to 2000W Solar Power for my home with 5 hours of power backup…Request you to publish a PIC based ckt with pure sinewave AC output. Also Primarily Battery should charge from Solar panel and if no proper sunlight then battery should charge from the Grid..

    Initially I thought to purchase it but I had checked with a vendor, he had qoute me 1.20L for 2000W, Thought let me build it myself..

    Reply
    • Swagatam says

      Hi, sorry I do not have a PIC based design with me at this moment with me.

      Reply
  3. David Hernandez says

    Good Morning,

    Very nice website… I am interested to have a complete circuit design to connect a solar panel 300w into a circuit to produce 120 AC/60 Hz/ 20 Amp. (willing to pay for the design).
    Solar Panel Specs: (to install 2 solar panels in parallel).
    Open Circuit Voltage: 38.80V
    Opitmum Operating Voltage: 32.20V
    Optimum Operating Current: 9.32A

    Reply
    • Swagatam says

      Thank you, and glad you liked it!

      You can probably build the circuit explained in the above article for your specific need, and hook it up straight with your 38 V panel.
      The only criteria being, the transformer and the 100 ohm resistor which will need to be replaced with a 24-0-24V transformer, and a 2k2 10 watt resistor respectively.
      Additionally you can add a couple of more MOSFETs in parallel with the indicated ones, for ensuring a much higher efficiency in terms of power optimization.

      Reply
  4. KV Prakash says

    Hi,

    I am working on developing a power box powered using lithium batteries and requirement is 1 kva power pure sinwave without transformer. Battery we can have multiple packs..Individual cells come at 2.7 v appx and packs can be arranged to have specific voltage and power.
    Can you help with good circuit to weigh less and have simplest but robust technology.

    Reply
    • Swagatam says

      Hi, you can try modifying the above explained concept in the following shown manner:

      pure sine wave inverter full bridge

      This will be a 250 watt model, if it works you can increase the current capacity by prortionately increasing the number of parallel MOSFETs and the battery mAh rating

      Reply
  5. suat kaleli says

    Hi Mr Swagatam;
    To understand the matter I made an simple circuit with 555 and IRF44 and by using 12 V DC 2 Amper input and I gained 220 V AC and 15W bulb was ON. However I am not able to measure output AC voltage since I measure live voltage at both side of output. Whenever I try to gauge AC output voltage then my multimeter shows error and short contact occurs again on the rotary switch terminals by excluding the fuse error. Thanks in advance

    Reply
    • Swagatam says

      Suat, either your meter is faulty, or may be the frequency is too high. Make sure the frequency is 50 Hz, also test the meter in your 220 V home AC socket for verifying its condition.

      Reply
      • suat kaleli says

        Lots of thanks Swagatam for he reply, however when I remove the short contact residue on my meter no problem on meausuring the home 220 AC voltage but after measuring the my circuit output then I am about to face the same problem. And also I have got 2 pencil types of meter one shows light if there is AC and other also shows the AC value. After receiving your reply, I have decreased frequency in the degree of that I can watch (as if blinking mode) I tested and again see the 110 AC at both side by measuring pen type meter. One side seems clear 110 V and other side seems inactive / pale written on the display / screen of the pen type meter. (it seems 110 AC since my input is 5 V DC there is no problem I am sure if I would increase the input DC voltage the output will be higher)

        Reply
      • suat kaleli says

        Hi Dear Swagatam; this is an amendment to my latest report. Please consider the following measurement is correct one.
        My pen meter shows the home AC measurement as:
        live side: 12 36 55 110 220 (AC 220 is active)
        notr side : shows only the value 12
        the meter also shows the inverter outout as:
        at the both side 12 36 55 110 (as I said before the value at one side is pale) The point is being interesting that although there is no output voltage on the meter the bulb 15 watt is ON.

        Reply
        • Swagatam says

          Hi Suat, please use a standard digital multi-meter with red/black probes, for verifying the results correctly, any other form of meter is not recommended for electronic circuit testing and troubleshooting.

          Reply
      • Widiatmono Hersan says

        Dear Mr.Swagatam

        I want to ask and comment on the inverter with the 48V battery that you designed. I have tried to make it and the results are good, my question is, if we are going to increase the power output capacity to 6 kW, our power mosfets are parallel 5 mosfets each. What transistor drivers need to be replaced with BC141 for example so that the driving power is large enough, another thing is that each gate needs to be installed with a resistor of about 5 ohms so that the signal is evenly distributed to the gate. ask for an opinion and explanation and thank you for your attention

        Best regards,
        Widiatmono

        Reply
        • Swagatam says

          Hello Hersan, I am glad you could make it successfully.

          Nothing needs to be changed in the circuit, no matter what output power is selected, except the transformer, MOSFETs and the Battery.

          Gates will not need any resistor for all the parallel MOSFETs in this circuit….you just need to connect their G,S,D pins together in parallel.

          Reply
  6. Desmond says

    Hi Sir,

    For the timer 555 pin 3 will it get square wave form? because I using Simulation only give me constant voltage.

    Reply
    • Swagatam says

      Hi Desmond, it will be in the square wave form!

      Reply
      • Desmond says

        ok got it my mistake enter wrong value. then for 4017 which out measurement should i take?

        Reply
        • Swagatam says

          the output frequency measurement should be taken at the MOSFET gate, or transformer output

          Reply
          • Desmond says

            ok thank. just one last thing . do u have the BOM list for this circuit? if yes can u list it down?

            Reply
            • Swagatam says

              I will try to update it in the article, if possible…

  7. MABANA KABUNA says

    Dear Swagatam,
    Thank you for your response. May you please clarify me about the voltage and current used to calculate the power of the resistor(10k) in transistor BC547. According to the formula you used in that 1500W inverter circuit: R =(1/4)x(W)x(5%).

    Reply
    • Swagatam says

      Dear Mabana, for high impedance (resistance) loads like mOSFeTs the calculation is not critical. For example instead of 10k you can use 22k or 47k or even 100k.

      for other loads you can use the formula which is explained in the following article:

      Transistor Relay Driver Circuit with Formula and Calculations

      Reply
  8. MABANA KABUNA says

    Dear Swagatam,
    I am about to implement the 1500W inverter circuit design. May you please guide me to determine the resistors values of the transistor BC547: 10K and 1K.
    Also I would like to know how to determine the number of Mosfet to be used in that circuit.

    Thanking you in advance for your assistance.
    regards,
    Mabana Kabuna

    Reply
    • Swagatam says

      Hello Mabana, if you are referring to the wattage of the resistors, they are all 1/4 watt 5%

      the number of MOSFETs can be 5 on each side.

      Reply
  9. Desmond says

    Hi Sir, One question for the 48 V and 12 V is it connected together or i just choose one ?
    Sorry this is my first time doing this project.

    Reply
    • Swagatam says

      Hi Desmond, they are supposed to be from different sources, however the 12 V can be derived from the 48 V also, by replacing the 100 ohm resistor with a 1 K 5 watt resistor

      Reply
  10. MABANA KABUNA says

    Dear Swagatam,
    Thank you very much for your response.
    May you please provide me a list of Technical specification of the components used in your design “1500 watt PWM Sinewave Inverter Circuit”. I am thinking to update it to 2000W if possible and combine it with Raspberry-Pi.
    Kind regards,

    Augustin Kabuna

    Reply
    • Swagatam says

      Dear Mabana, everything is standard in the diagram. You can copy the parts from the diagram, and procure them.
      For 2kv you may have to add a couple of more MOSFETs in parallel, and upgrade the transformer accordingly.

      Reply
  11. MABANA KABUNA says

    Dear Swagatam,
    Thanks for sharing your ideas in this field of electronic.
    I would like to build solar inverter using Raspberry-Pi. May you please provide me the details specification for your design: 1500 watt PWM Sinewave Inverter Circuit.
    Please if you have some suggestions for that project of mine, you are welcome for discussion.

    Kind regards,
    Augustin Kabuna

    Reply
    • Swagatam says

      Dear Mabana, I am sorry, Raspberry is not within my field of expertise so it can be difficult foe me to suggest you on this subject.

      Reply
  12. Francisco López says

    Swag you are an excellent professional and a true passionate about electronics, I am an electrician but I am still passionate about electronics, I appreciate that you share your knowledge and your projects. I am from Venezuela today the electrical system is very deteriorated and I want to put together simple projects that can contribute to improving quality of life.

    I will build this wonderful project greetings

    Reply
    • Swagatam says

      Thank you Francisco, I appreciate your kind feedback, and wish you all the best with this project!

      Reply
  13. Hansley says

    Hello what frequency out will I have if I have 4khz input to 4017s

    Reply
    • Swagatam says

      Hi, Divide it with 18

      Reply
  14. Patrick says

    Hello sir,
    Thank you so much for the answer you provided to my earlier question.Please i would like to build the 1500kva sine inverter with a transistorised astable multivibrator with two square wave outputs.How can i do away with the 555 timer on your circuit and incorperate my sq wave circuit and still retaining the two 4017 ic.How many and the values of capacitors to be added at the output to improve the wave form and i would like to know why it has no feedback to avoid output voltage drop at addition of loads.
    Thank you in advance,i am looking forward to your reply.

    Reply
    • Swagatam says

      Hello Patrick, you just have to remove the IC 555 stage and replace it with transistor astable. Use one of the collectors of the astable transistor and connect it to the point where pin#3 of the IC 555 is connected.

      You an add 5uF/400V for the output capacitors. Feedback is avoided for simplicity. voltage will not drop by much as long as the load wattage is within the battery capacity.

      Reply
  15. Josh says

    Hi
    Thanks for such informative information really enjoy it. Just want to know if you have a 1500w, 240vac inverter circuit with the charging circuit.
    Regards

    Reply
    • Swagatam says

      Hi thanks, I have many charger circuits explained in this website, you can select an appropriate one and use it in conjunction with this design

      Reply
  16. Bios says

    Hello sir: if i use 2n3055 transistor will it work as mosfet do?

    Reply
    • Swagatam says

      You will have to use it Darlington form, but still it won’t produce more than 200 watts.

      Reply
    • Haruna says

      sir please i want to build 1000 watt inverter how can i calculate ,
      1. the size of transformer to use
      2.how to calculate the number of mosfets to use
      3.how can i know that both transformer and mosfets will give me 1000 watt

      Reply
      • Swagatam says

        Haruna, you can read the following article for the required details

        https://www.homemade-circuits.com/how-to-calculate-and-match-inverter/

        Reply
  17. Bios says

    Hellow Sir can i use irf 540n mosfet?

    Reply
    • Swagatam says

      Yes you can, but add a few in parallel for better efficiency

      Reply
  18. Graeme says

    Great design. Is it possible to increase the output power by adding additional output output stages (drivers, FETs and transformers) in parallel? I think they do something like that with the commercially available devices for the grid tied systems. How complicated is this to acheive? Thanks.

    Reply
    • Swagatam says

      Thank you, the power can be increased to any limit by modifying the battery, MOSFETs and the transformer, but Grid integration will require accurate synchronization of the frequency and RMS

      Reply
  19. Bios says

    Hellow Sir is fan necessary in this circuit for cooling? if it is how can i connect it?

    Reply
    • Swagatam says

      It will depend on the load, if it’s fully loaded then a fan may be needed….you may apply the last circuit from this post

      https://www.homemade-circuits.com/lm35-circuit/

      Reply
  20. Bios says

    Hello sir: what if i will use 1n5406 diode instead?

    Reply
    • Swagatam says

      The difference is only in the maximum tolerable voltage levels, please compare the two through their datasheets and you will be able to understand the difference.

      Reply
  21. Patrick says

    Dear Swag
    Thank you so much for the wonderful elect. Engineering package from you to the world for free. I am sure many would not like to do it and keep it to themselves.
    I have been regularly visiting your cite for various elect,circuits but the pwm sinwave inverter has taken my whole attention.I was taught on sq wave inverter by friend in polytecnic school and it worked fine ,but i want to build a pure sine wave circuit.
    Please among your two or three spwm circuit descriptions,which one is the best if i want to build like 1500va.
    I would also like to know why you leave some finishing touches on some circuit to the intended hobysts and builders ,like tank circuit you talked at the output .How can one know he achieved a bether result in absence of an oscilloscope to check output wave?
    I did my I.T in Indian acquired firm in Nigeria.I photocopied an inverter booklet from a friend from an indian.One circuit talked about using a tank circuit where inductor and capacitor reactance are equal and connected to the transformer input to achieve a pure sinwave and not at the output.What do you say on this?
    Thank you,

    Reply
    • Swagatam says

      Thank you Patrick, the above circuit is best sine wave inverter you can have in terms of simplicity and accuracy. If you can compromise with light lower sinewave quality, then you can try the following design which is ee simpler than the above:

      As you can see adding a filter at the output side is much easier and can be implemented with some trial and error and with minimum losses. Moreover you can achieve pure sine results even without an inductor, because the secondary winding itself acts like an inductor, therefore this looks a simpler and more effective option.

      Reply
      • Bios says

        Sir I have 2n3055 transistors can i place them instead of TIP 35?

        Reply
        • Swagatam says

          you can after adding a TIP122 in Darlington with the TIP35

          Reply
  22. Bios says

    Sir I want 500watt only can i use 12-0-12 transformer and 12v 100ah battery?

    Reply
    • Swagatam says

      Bios, use a 300 watt transformer for getting 300 watt power

      Reply
  23. Bios says

    Hello Sir: would this inverter power small appliances like televisions, and phone charger

    Reply
    • Swagatam says

      Hi Bios, yes it can be used for powering all types of electronic equipment

      Reply
  24. Gabriel Maffla says

    Regards. 400 W at 60 Hz is enough for me and I only have a 12 V / 60 W solar panel as a source. Can I implement it? What should i change? You help me?

    Reply
    • Swagatam says

      60 w panel will not produce 400 W

      Reply
  25. Jorge Delgado says

    Cordial Greeting, I congratulate you on your excellent page.
    I have proposed to design the inverter that is very interesting but a question arises, adding another power transistor in parallel I can place it completely in parallel or I must place a resistance, and of what value, to the Gate of the transistor, thank you very much for your attention and collaboration.

    Reply
    • Swagatam says

      Thank you jorge,

      You can place the mosfets directly in parallel, no need of any resistor or transistor

      Reply
  26. Hassen says

    ok swag thank you for you respect full replay, i will see you next days if you can.

    Reply
    • Swagatam says

      You are welcome Hassen!

      Reply
  27. Hassen says

    Dear swag, Thanks so much for your useful information and guiding for different persons who are interesting to study and work on this course. , if you have please bring me a document which basically explains the design calculation of “designing inverter using SPWM technique”

    Reply
    • Swagatam says

      Thanks Hassen, I have not yet investigated the calculations of SPWM, but I may surely look into it and present a new article on it, possibly soon!

      Reply
  28. Tolu says

    Please can I use a battery charger to run an inverter. Pros and cons

    Reply
    • Swagatam says

      If its current is high enough then you can use it for testing the inverting

      Reply
      • Tolu says

        Can’t it be used to run small loads

        Reply
        • Swagatam says

          Please explain the purpose so that i can understand the reason behind using a power supply to run an inverter.

          Reply
          • Tolu says

            I have 24v battery bank and 400w panel connected to 2kva inverter. I also have 48v /20amps battery charger. I want to build 48v/2kva inverter to connect with the charger for better efficiency with my loads, because I can’t buy more batteries for now. Please educate me . thanks sir

            Reply
            • Swagatam says

              So you want to charge the battery bank with the solar panel, and then use the charged battery in parallel with a 48V mains converted DC for operating the inverter?? No problem, You can do that!

  29. NISHANT says

    sir,
    I have a luminous sine wave inverter…….
    recently it is
    1.Not giving output with battery(gives output when mains connected).
    2.On connecting battery……all led display lights glow for 2 sec then gets off.
    3.Outer Fuse
    What could be the problem…….which components on the PCB should i check ?

    Reply
    • Swagatam says

      Hi Nishant, connect a load and then connect the battery. Check if the load is also activating for 2 seconds or not.

      If yes in that case the relay changeover circuit could be malfunctioning, the relay may not be holding to keep the battery connected with the inverter.

      If the load does not activate then the problem could be more complicated, in that case you may have to manually bypass the battery line connecting the inverter and do the further checks depending on the results.

      Reply
      • NISHANT says

        thankyou sir for the reply

        Reply
  30. Lins Roberto Pereira, says

    O QUE TENHO QUE FAZER PARA MUDAR PARA 110V NO SECUNDÁRIO? OBRIGADO.

    Reply
    • Swagatam says

      Use um enrolamento secundário de 110V para o transformador, isso é tudo. Nenhuma outra mudança necessária no circuito

      Reply
  31. sinoda says

    sir gud day…I tested the circuit frequency and waveform at the collectors of two bc547 using my DIY soundcard Oscilloscope, the output frequency 52.9 hz and the wave was like this:
    https://www.4shared.com/photo/XSIBuOsKee/1500_watt_PSW_inverter.html
    is that ok sir?I’m a bit confuse becoz ist very distorted square wave…pls help me how to enhance this sir.

    Reply
    • Swag says

      Good day Sinoda, yes that’s OK, you can adjust the upper and the lower waveform uniformly to make it look perfect…it will be distorted slightly, because there will be always some spike and transients and harmonics, but those can be countered by adding a small value capacitor at the secondary side of the trafo.

      Reply
  32. Nkwenti says

    then can i replace the mosfets with IRF540?

    Reply
    • Swag says

      yes you can

      Reply
  33. Nkwenti says

    Sir can you explain a little about the transformer, you said primary 40-40 , where you trying to say secondary? then what about i replace the 1N5408 with 4007?
    then if i use 4 pair of mosfet transistors, will it deliver more power? what is the maximum secondary amperes of the transformer, then sir please do you have a 50AMP battery charge controler schematic for the solar?
    thanks and i will be looking forward to hearing from you.

    Reply
    • Swag says

      NKwenti, The input winding is always referred to as the primary, so here since the 40V side is the input it is the primary.

      The requirement for the mosfet is to have a specification higher than the maximum load wattage, you can satisfy this using 2 or 4 mosfets depending on the the selection…the same goes for the transformer secondary:

      https://www.homemade-circuits.com/how-to-calculate-and-match-inverter/

      there are plenty of battery charger circuits in this website, please use the search box and then you can select the one which suits you the best…

      Reply
  34. Kassim Abba Dandago says

    Hi. Please what are the filter components to use at the output of the iron core transformer?

    Reply
    • Swag says

      Hi, the secondary transformer winding will itself act like an inductive filter, still you can add a 0.22uF or a 0.47uF/400V capacitor across the coil and check the response….check with a load connected.

      Reply
  35. Nkwenti says

    can the mosfets be replaced with IRF540?

    Reply
    • Swag says

      yes, if your requirement is within the mosfet’s rating specs

      Reply
  36. Saeed Mahdavi Asl says

    Dear Swagatam:
    Thanks a lot for your useful info on electronics and guiding us to this course.
    would you please explain more about how to parallel transistors??
    and how to connect them in series ???
    thanx a lot
    Your Sincerely Saeed

    Reply
    • Swag says

      Thanks Saeed, I already have one related article posted in this website which explains the right ways to connect transistors in parallel, you can read it here:

      https://www.homemade-circuits.com/transistor-facts/

      Connecting transistors in series is normally not practiced in electronic circuits and it may not be recommended also.

      Reply
  37. Jojo says

    7808ic is a voltage regulator. So how can it work as AND gate?

    Reply
    • Swag says

      sorry, it is 7408 and not 7808

      Reply
  38. Jojo says

    Thanks sir.I have Google it but I didn’t understand how to use it.pls give me any one with the pins out that you know according to my description of that diagram.

    Reply
    • Swag says

      you can use 7808 IC which has AND gates inside it, just check which pins connect with the those oval shaped designs inside the IC, and replace those pinout with your AND gates shown in your inverter circuit

      Reply
  39. Jojo says

    Sir swag,pls i dont know how to configure this (AND gate) with this microcontroller. Pls give me any circuit relating to AND gate.check the schematic here. 4.bp.blogspot.com/-Llu4f6lzODA/UR-Gya40gGI/AAAAAAAAAbM/nuos2eLOTSs/s1600/pic+config.png

    Reply
    • Swag says

      Please Google for “AND gate IC” and integrate the selected IC pinouts accordingly

      Reply
  40. King says

    Good day Mr. Swag, can the above concept be implemented with 3kva and above? If yes, what specs of transformer and MOSFETs will you recommend.? And how do I go about the filter part. Thank you, awaiting your reply.

    Reply
    • Swag says

      Hi King, that is possible. Divide 3000 with battery voltage this will roughly give you the transformer primary current.
      For the mosfet make sure its continuous current and voltage ratings are much higher than transformer rating.
      Battery Ah should be 5 to 10 times higher than the calculated value of transformers current rating

      https://www.homemade-circuits.com/how-to-calculate-and-match-inverter/

      Reply
  41. Jojo says

    Thanks so much swag.Its a final year project and my certificate depend on it.I will try it again.

    Reply
    • Swag says

      wish you all the best jojo, if you have any further doubts don’t hesitate to ask them.

      Reply
  42. Jojo says

    Swag,most engineer does not have oscilloscope but I think you will have a design that has lc filter,so pls help me with the one that has giving you good result. Thanks

    Reply
    • Swag says

      Jojo, while dealing with a sinewave inverter circuit, an oscilloscope is mandatory, otherwise it won’t make sense.

      Anyway, you can select one of the following designs as per your preference, but all these will again require an oscilloscope for confirmation of waveform and will require an LC filter at the output, I do not have the calculations for the LC filter it will need to be done through manual experimentation.

      https://www.homemade-circuits.com/?s=SPWM

      here’s another good choice

      https://www.homemade-circuits.com/pure-sine-wave-inverter-circuit-using/

      Reply
  43. Jojo says

    I tested it with load like refrigerator and air condition but it did not work fine.pls help me with a better version that is pure sine wave

    Reply
    • Swag says

      sorry that’s not the way to test and fine tune an inverter output, you must do it through an oscilloscope by analyzing the waveform and then tweak it through a LC filter circuit at the output to achieve the required output. If you do not have an oscilloscope then please do not attempt any of the sinewave inverter circuits.

      Reply
  44. Jojo says

    Pls swag,I av tried this circuit but its not pure sinewave.pls I need your best PURE SINEWAVE CIRCUIT for 5kva/36v battery.

    Reply
    • Swag says

      JoJo, how did you check the output waveform?…you will need to check it with an oscilloscope and with a load connected with the transformer. For further improving the results you may try connecting a 105/400V capacitor across the secondary winding output.

      By the way it will not give a best sineave, but much closer to a sinewave

      Reply
  45. Jojo says

    Pls sir I need a 48v/5kva pure sine wave inverter circuit that has an automatic battery shut down and no load sencing.

    Reply
    • Swag says

      Jojo, you can try the above explained concept, the battery shut-off circuit can be easily included later on one the inverter is finalized

      Reply
  46. Giel says

    Hi Swag,

    What is the amp rating on your 40-0-40 transformer

    Reply
    • Swag says

      Hi Giel, just divide the required output wattage with 40, this will roughly give you the required amp capacity of the transformer

      Reply
  47. Fardin says

    Sir

    Witch transformer should i use for 1000w with 12v 200AH battery

    Thank you

    Reply
    • Swag says

      Fardin, with a 12V battery the transformer will need to be around 1000/12 = 83 amps, 7-0-7V

      Reply
      • Fardin says

        Sir

        Do i have to change the mosfets?

        Reply
        • Swag says

          Yes, you can try the following specs:

          https://www.homemade-circuits.com/55v-110a-n-channel-mosfet-irf3205/

          Reply
          • Fardin says

            Sir

            From ic1 i’m getting around 6.6vac gate voltage
            And ic2 i’m getting around 5.1vac from gate
            Why this is happening?
            And my ic2 is getting warm
            My suppy voltage was 12vdc

            Reply
            • Swag says

              Fardin, slight voltage difference at the gates may not be critical, but if your IC is getting warm then that could be an issue. I hope you have connected the reverse diodes across the mosfets, if not please do it and check again.
              Also make sure the IC Vcc is not over 12V.

  48. ainsworth lynch says

    In the working of this circuit you have 40-0-40v transformer to be used with 48v battery supply, shouldn’t that only be used for a square wave inverter?

    with a spwm inverter shouldn’t the transformer be 24-0-24 for a 48v battery supply?

    Reply
    • ainsworth lynch says

      so as an example If I was to use a 12v battery supply transformer would be 6-0-6v, is that correct?

      Reply
      • Swag says

        you will have to identify the average ON time % of the SPWM, multiply this % with the battery voltage to get the transformer primary value

        Reply
    • Swag says

      It will depend on the average value of the SPWM voltage with respect to the battery voltage. The resultant value can be used for determining the transformer secondary voltage value.

      You can the related information below:
      https://www.homemade-circuits.com/inverter-voltage-drop-issue-how-to-solve/

      Reply
  49. LYNCHPOWER ELECTRONICS says

    Good Day,
    Have you tested this design or the arduino spwm design?

    Reply
    • Swag says

      yes those are tested designs

      Reply
  50. olupot says

    hello sir do you have any idea about self running generator thanks

    Reply
    • Swag says

      sorry I do not have any idea regarding this concept

      Reply
  51. bashir says

    Sir can i run the above inverter circuit with 12v battery by changing 48-0-48 transform er with 12-012 transformer

    Reply
    • Swag says

      bashir, it is possible, but the transformer will need to be rated at 9-0-9V

      Reply
      • Swag says

        ..and the mosfets could be replaced with IRF540

        Reply
  52. RAIMUNDO CASTRO SANTOS says

    Olá sou do Brasil e acompanho as suas publicações continui com esse bom trabalho tem ajudado muita gente eu fiquei interessado no projeto do inversor senoidal se possivel poderia me enviar o projeto completo por gentileza obrigado

    Reply
  53. fred says

    sorry youupdated already the diagram but one more questions sir the mosfets where is the gate drain and source canyou please put it on each channel thanks..nd more power sir

    Reply
    • Swag says

      Fred, the pins which are connected with the transformer are the drains, the pins which are connected with the BC547 are the gates, and the ones which are connected to the negative or ground line are the sources of the mosfets.

      Reply
  54. fred says

    sir swatagam do you have the complete diagram and omponetguide and pcb design for this 1500watts inverter can u please send it o my email thank you it much appreciated…

    Reply
    • Swag says

      Fred, I have updated the diagram with more details, please copy the parts list from the diagram, everything has been included according to me….if you have any further doubts, please let me know.
      PCB design is at the moment not there with me, if possible I’ll try to update it soon…

      Reply
  55. saviour says

    Thanks a lot mr swag,for the reply ,there are some design i have put-up to that effect using DPDT relays and low battery cut-off protection circuit ,i will send an attachment to you when i conclude.well done!

    Reply
    • Swag says

      You are most welcome saviour! please keep up the good work

      Reply
  56. saviour says

    dear swagatam i really thank you for great work in helping people like us who are born engineers but could`nt afford to study in a Tertiary institution, to navigate our way around in electronic circuit design.
    I conceive an idea, pls check if such idea is design-able.
    i called it P.P.S.S that is permanent power supply system,this is it.You create two inverter system that works in flip flop manna to power a connected load,one will be working while the other is charging,when its battery reaches a certain discharge level the system flips and the other takes over duty without any interruption to the connected load.to reduce cost one transformer may be use for the two of them.

    secondly how can we partner in Nigeria to enter into production of affordable power supply system for the poor people who are paying with their blood just to light candle.

    Reply
    • Swag says

      Dear Savior, I am glad you liked my website.
      However the idea you have conceived may not work, because the power output from any inverter will be always less than the input battery power consumption, so ultimately the power exchanges between the two inverters will keep reducing until the both the batteries are unable to get charged any longer from the inverter outputs.

      I am really sorry, partnering may not be possible due to the work pressure that I have to handle in the present moment, although I appreciate your offer very much and wish we could partner for this noble cause.

      Reply


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