Saturday, April 27, 2013

Simple Pure Sine Wave Inverter Circuit - 500 Watt Pure Sine

The post explains how to make a pure sine wave inverter using ordinary components and yet get reasonably outstanding results.


The circuit basically uses a push pull topology through a couple of 24V batteries. The use of two 24V batteries allows lower AH batteries to be incorporated with higher efficiency and wattage.

12V batteries can be also tried however the power output would be reduced to half.

Since a dual supply is used the connected transformer does not need to be a center tapped type, rather a two wire ordinary transformer becomes suitable here.

The couple of designs shown below are all that would be required for implementing this simple pure sine wave inverter circuit.

The first circuit is the basic sine wave generator which  becomes the feeding input to the main sine wave amplifier or the output stage.

The sine wave generator produces a pure sine wave output with the shown components at about 50Hz, for other frequencies the 2.5K resistor may be altered, and tested in a simulator for fixing the desired results.

The sine generator circuit should be supplied with +/-12V, and not directly from the 24V battery supply as that might damage the IC permanently.

The opamps used in this sine generator are from the IC TL072

The next diagram shows the output stage of the proposed simple pure sine wave inverter circuit. As can be seen the design is not at all complicated.

All the involved components are standard, and easily available.

The mosfets are IRF540n and IRF9540n which compliment each other to produce the required push pull effect over the attached transformer.

With a 0-24V/25amp transformer, and a couple of 24V batteries  the circuit would be able to generate as high as 600 watts of pure sine wave output at the relevant voltage.

The output across the right hand side opamp of the sine generator is to be connected across the input of the second circuit for initializing the proposed operations.








Battery Wiring Details for the above Simple Sine Wave Inverter Circuit





139 comments:

  1. Hello Swagatam. Does the output voltage remain stable when several appliances are connected.

    ReplyDelete
    Replies
    1. Hello Hassan,
      No it won't be stable, The output will drop with increasing load....

      Delete
  2. How can we improve it for a stable output voltage

    ReplyDelete
  3. hi sir swagatam can I asked you how to compute the voltage drop of resistor how to compute the base resistor emitter and colector resistor imean I asking the formula because im not a engineering Im only Technology of 2 years I want to explore my knolegde of electronics hoping sir swagatam i believe your the great Engineer thanks advance.

    ReplyDelete
    Replies
    1. Hi Roderel,

      It's can be a huge subject, cannot be explained through comments, you may refer to these article, might provide some help:

      http://homemadecircuitsandschematics.blogspot.in/2012/01/how-to-understand-and-use-transistors.html

      http://homemadecircuitsandschematics.blogspot.in/2012/01/how-to-make-relay-driver-stage-in.html

      Delete
  4. Hi Swagatam

    Can ur earlier given output correction circuit be used here, will it work?

    Regards

    ReplyDelete
  5. hello sir Swagatam this inverter circuit works for all sophisticated devices? ... as pc, lcd tv, laptop, notebooke, etc. thank you very much
    luis from Argentina

    ReplyDelete
    Replies
    1. Hello Luis,

      Yes since it's a pure sine wave it's suitable for everything....

      Delete
  6. thanx sirji i think its very usefull to all coz
    here all ur fans looking for such ckt
    sirji i want knoe that which x'mer used here to obtain max wattage
    is this xmer is 24-0-24 20amp transformer

    ReplyDelete
    Replies
    1. Thanks Girish,

      the transformer here is 0-24V, but you can also use a 24-0-24V to make it a 48V transformer, but the batteries will have to be 48V x 2nos...this will make the inverter 1KVA rated.

      Delete
  7. If someone builds this circuit please commented operation. Thank you.
    Luis.

    ReplyDelete
  8. Hi Swagatam

    There are two questions I would like to ask:

    1. Efficiency of this inverter
    2. If I use salvaged power transformer (heavy iron core type, 50hz) from an APC UPS 650, how it can be used in 12V+0+12V circuits since its windings are 8 to 9 volts each instead of 12V. How am I supposed to use such transformers in schematics mentioned at your site, would u like to suggest any change in schematic etc.?

    Regards

    Sam

    ReplyDelete
    Replies
    1. Hi Sam,

      I am not sure about the efficiency because I haven't tried it yet.

      8 to 9 volts in each half winding is in fact perfect for most of my designs as it would provide a little higher than the rated 220V, so even at lower input voltages the output would stick around 220V.

      Regards.

      Delete
    2. Hi dear sir for testing purpose instead of battey can i use power supply for giving a supply to circuit.
      Please reply me on Email id taht is;-sfe.shiv@gmail.com


      Thanking you

      Delete
  9. i just want to try it.. i will feed you back..thanks for your care

    ReplyDelete
  10. very good sir
    and no charger / automatic changeover section?

    ReplyDelete
    Replies
    1. thanks, will try to to update them also...

      Delete
  11. Hi Swagatam

    Thanks for your quick response. However I have two more question:

    1. if salvaged transformer winding is 8-9 volt then 12-14 volt from a juicy battery is going to damage the winding by overheating it since it was wound for a lower voltage.

    2. Moreover if salvaged transformer is from a sine wave UPS then a modified square wave or square wave inverter may slowly damage it due to extra transients since it was made for a sine wave and not for square wave. I think square wave transformers are made with extra winding (head room for transients) but am not sure what do you say?

    Regards

    Sam

    ReplyDelete
    Replies
    1. Hi Sam,
      A transformer is a solid state device which is made up of metals.

      It would get damaged only under conditions where it gets very hot, otherwise I don't think you can damage an iron-cored transformer through any other means.

      9V is just under 12V so it would make the transformer slightly warm, not much, moreover it's the wattage consumption at the output that may be responsible for heating up the transformer, if it's controlled appropriately, things would be all right.

      You may incorporate my circuits which have a 555 pwm controller attached, this would give you an option of controlling the RMS so that the transformer is not operated under incorrect voltage parameters.

      Delete
  12. hi swagatam

    i have gone through the circuit. i just want to know whether this circuit will be able to charge a normal battery of 1kva. please tell me what are the changes required to be done in the circuit so that i can charge that battery using a solar panel

    regards,

    suneetha

    ReplyDelete
    Replies
    1. Hi Suneetha,

      It is not a battery charger circuit, it's an inverter circuit, if you want to include a charger circuit, you can attach the following circuit with it:

      http://homemadecircuitsandschematics.blogspot.in/2012/11/high-current-transistor-tip36-datasheet.html

      Delete
  13. Hi Sir,

    Your skills building inverters are amazing.
    I've seen inverters that do not rely on the transformer to make the output, instead, they first transform low DCV to high DCV (H-bridge)using FETS and small HF transformers, and then modulate for pure sine AC through another H-Bridge i think.

    Is it possible that you can give us such a design, cause it seems one can get outputs over 2000W using small transformers.

    Hope you take my proposal under consideration

    ReplyDelete
    Replies
    1. Thanks!

      Such inverters are not difficult to design except the output ferrite transformer which requires specific calculations therefore becomes a fairly complex parameter to handle.

      Due to this reason I haven't posted any of these circuits.

      Delete
  14. Dear Sir, Could you post better resolution picture for second circuit, i can't read resistor's values
    Grateful

    ReplyDelete
    Replies
    1. Use the "zoom" feature at the bottom right of the page...you would be able to figure out all the details.

      Delete
    2. Dear sir,

      Sorry to bother you again with this, i've tried to zoom in but still can't figure out some numbers, specifically:
      R9-R10 - i see 1K(something) i assume 1K0 meaning 1K Ohm
      R19-R20-R21-R25- i see (somthing)E22 i assume 0E22 meaning 0,22 Ohm
      R24 i assume 10E meaning 10 Ohms
      Q7-Q8 i assume BD140
      also a assume international notation meaning for example 2k2 = 2,2K Ohm

      Again, sorry to bother you with small details, but i really wanna build this circuit and that means spending money on parts, and dont want to make mistakes.

      Delete
    3. yes everything noted by you is correct to the point.

      however please note that the design has not been verified practically.

      Delete
  15. hello sir im jay i just want to ask about your sine generator first circuit, its about a tree 2uf parts sir is this a tantalums type or electroytec, i need your answer sir please. ive been build your sine wave inverter i just cant finish it the generator sine wave. Hope to your reply,

    ReplyDelete
    Replies
    1. helo jay,

      it could be a tantalum or electrolytic, doesn't matter, but tantalum would be more accurate.

      Delete
  16. thanks sir for an info ive used a electroytic capacitor when i test. its working normarly, but better to use a tantalum type! Now i perfectly use ur sine wave inverter circuit. And i plan for inprove it to 4000wts sir thanks you so much as i read your all article about sine wave generator step by step, and its great all have worked perfectly. Thanks onece again sir..

    ReplyDelete
  17. Hi Mr. Swagatam,

    I find this design very similar to what I am looking to build for my project.

    First, I need to step up 12V DC input to 240V DC output through a Flyback converter. Then, I need to invert that output to an AC form. Can I use this circuit?

    Thanks

    ReplyDelete
    Replies
    1. Hi Mr.Weizhuan,

      This circuit is not what you are looking for. The above circuit makes use of iron-core bulky transformer, so it won't suit your application.

      Delete
    2. I see. I clearly got it wrong here.

      What would you recommend for that application wish I seek to build? I've tried a H-bridge inverter configuration. On circuit (I'm using Proteus) it works but when I implement on hardware, it doesnt.

      Can I send you an email with the simulation attached and perhap you could help me with it?

      Thanks

      Delete
    3. Simulators can be compared with a "blind man with a stick" so I never use them.

      for the converter stage you can try this circuit:

      http://homemadecircuitsandschematics.blogspot.in/2013/06/universal-ic-555-buck-boost-circuit.html

      For processing the above output you can try the following circuit using mosfets rated at 300V:

      http://homemadecircuitsandschematics.blogspot.in/2013/05/full-bridge-1-kva-inverter-circuit.html



      Delete
  18. HI DEAR swagatam i am big fan of your's can you plese provide us circuit digram of 12v DC -230v AC power inverter digram having maximum wattage i am eagerly wating of your reply.

    thanking you in adavnce

    ReplyDelete
  19. HI DEAR swagatam i am big fan of your's can you plese provide us circuit digram of 12v DC -230v AC power inverter digram having maximum wattage i am eagerly wating of your reply.

    thanking you in adavnce

    ReplyDelete
    Replies
    1. Thanks Shiv,

      You must first try a smaller version then upgrade it to higher ratings. You may start with the following circuit:

      http://homemadecircuitsandschematics.blogspot.in/2012/09/mini-50-watt-mosfet-inverter-circuit.html

      Delete
  20. Sir Swagatam,I'm working on the circuit at the moment,but I have a some confusions which I'l be really happy if you can clear me on. First is the use of "couple of 24v batteries". does it mean I cant build the circuit and use single 12v battery?
    secondly, The outputs in the first circuit, are two. Which of them do i connect to the second circuit as input? If its the one on the RHS,where does the second one go?
    Finally,how can i determine the Amperage of my transformer?

    ReplyDelete
    Replies
    1. The above circuit works with two batteries, you can use two 12V batteries but the relative power output will be 50% reduced than two 24V batteries.

      Use the output from the green line, extreme right side.

      for knowing the trafo amp apply 220V at its relevant winding, connect an AC ammeter set at max current range on other side of the trafo for a few seconds until you get the required current reading.

      Delete
    2. Thank U so Much sir.I'v started work on the circuit. just a little problem. I live and work in Nigeria,and I'm having issues finding the TL092. Are there any equivalents that could find ??? Thanks once again.

      Delete
    3. you can try LM324 in place of TL072

      Delete
    4. Thank U so much. God bless U!

      Delete
    5. Dear sir Swagatam,
      On your first diagram where does the other red line output connected to?

      can i used 12-0-12 centertap transformer?

      thank you very much sir for inspiring me of your blog..
      thanks
      Paul

      Delete
    6. dear sir, can you post all parts need please sir.. thanks a lot..

      Delete
  21. Dear sir Swagatam,
    On your first diagram where does the other red line output connected to?

    can i used 12-0-12 centertap transformer?

    thank you very much sir for inspiring me of your blog..
    thanks
    Paul

    ReplyDelete
    Replies
    1. Dear Paul,

      Ignore the red line, it's unused...

      12-0-12 will work but the center should be left open and a 24V batt should be used.

      If I get time i'll surely update the article with the parts list.

      Delete
    2. Dear Sir,

      Is 12-0-12 1.3amp center tap transformer can be use here?

      thanks...

      Delete
    3. Dear Paul,

      You will not get any power from a 1.3amp trafo...use at least a 5 amp rated trafo.

      Delete
  22. Dear mr.swagatam,
    i want to ask you about the transformer,i understand that the rating should be minimum 5 ampere.
    but what i cant understand is what is the step up value of the transformer
    is it 12 volt to 220 volt transformer?
    what is the value of the first winding " voltage "
    thanks in advance
    regards,
    MICHAEL

    ReplyDelete
    Replies
    1. Dear Michael,

      The primary should be equal to the battery voltage, in the above figure it is 24V primary, and 220VV secondary(output)

      Delete
  23. dear mr swagatan,
    what do you mean by 0-24 volt transformer?
    what is the first winding voltage if the second is 220 volt ac
    in a clear way,
    what should i tell the store when i want to buy it?

    ReplyDelete
    Replies
    1. tell the shopkeeper that you want a 0-24V/5amp, 220V transformer, this will be sufficient for him to understand.

      Delete
  24. dear mr swagatam,
    where should we input the + and - 12 volts in the first schematic?i mean at which terminals the + and which terminal the - ? and what should we input 12 volt dc or ac?

    ReplyDelete
    Replies
    1. use opamps from the IC 324, and apply the supply across its pin11 (-) and pin4(+)

      Delete
  25. im sorry for bothering you agian mr swagatam,
    u didnt get what i mean,
    lets say i already got a 12 volts source.
    where in the first picture should i input them? before the 1 k resistance?
    and what should the 12 volts be ac or dc?

    ReplyDelete
    Replies
    1. As mentioned in my previous comment, the supply needs to be applied to the supply pins of the IC, the lines which are marked with ground symbols will go to the series point of the two batteries, because in the above design we have used two batteries in series for getting the required dual supply voltage.

      Delete
  26. Dear mr swagatam,
    thank you for your innovations i really like them all,
    concerning the first schematic of the sinewave generator
    should i feed it with 12 volt ac or 12 volt dc?
    regards,

    ReplyDelete
    Replies
    1. Thanks,

      (+)12 to pin4, (-)12V to pin11 of the IC324.

      All the ground sysmbols are connected with the series wire of the two batteries.

      Delete
  27. Dear sir,

    i have a 220vac primary transformer and secondary output is 18-0-18 vac at 40amps, can i use this on your pure sine wave generator?
    thanks...

    ReplyDelete
  28. Dear mr swagatam, what should the output be in the fisrt schematic(sinewave generator)? if i input 12 volts then what should the output at the second op amp be?
    and why i see alternative simulations? the output is AC or DC?
    thanks in advance

    ReplyDelete
  29. dear swagatam, i dont know if im getting the right output, all grounds are connected together but not with the series point, is this why i am not getting the output in the schematic of the first circuit? im mesuring between output and ground im getting something like 0.09 volts AC

    ReplyDelete
    Replies
    1. You will need a series battery connection as shown in the diagram for getting the required (+)(-) and ground terminals, without this the circuit won't work.

      Delete
  30. Dear Sir Swagatam,

    i have a transformer 18-0-18 and i was wondering how many volts should i feed to it?
    and can i use sla battery series/parallel to this circuit i have a bunch of battery laying around..

    thank you sir

    ReplyDelete
  31. Dear Sir,

    in your first circuit where should i put the input voltage? and what is the voltage rating? thanks in advance..

    ReplyDelete
    Replies
    1. Hi Paul,

      you can use the 0-18V tap and connect it with the above circuit, and use two 24V batts in series as indicated.

      Delete
  32. Please sir,can i use the output from the sinewave oscillator to drive a darlington pair transistor which will in turn switch current into a transformer, instead of using the second diagram you posted,please reply.thanks.

    ReplyDelete
    Replies
    1. if that would be possible, why would i suggest the second circuit? It's not possible.

      Delete
  33. Please sir, can i have a list of parts needed in your 2nd circuit please.. thank you very much sir..

    ReplyDelete
  34. Dear Sir,

    on the sine wave generator circuit only output 1 and 2 is used while the output 3 & 4 not in use? i am using LM324 and 60hz is still gonna work sir? thanks in advance..

    ReplyDelete
    Replies
    1. Dear Paul,
      LM324 has 4 opamps, you can use any two of them and wire them as per the given first diagram above....

      Please click the second diagram and magnify it, you will be able to see all the parts in the diagram.

      Delete
  35. hai sir
    i can using ic 8038 it is working or not since wave genator circuit

    regards

    ReplyDelete
    Replies
    1. Yes it will work, but the chip is obsolete now.

      Delete
  36. Dear Sir,

    in your sine wave generator circuit is 59hz frequency still ok to used for this circuit sir?

    ReplyDelete
    Replies
    1. it will depend on your country specs...if it's 60Hz, then 59Hz will be OK

      Delete
  37. thank you very much sir for the reply.. is 2uf caps on sine wave generator ceramic caps or electrolytic caps? and can i used irf840 sir on Q4 & Q5? thank you in advance sir..

    ReplyDelete
    Replies
    1. it's nonpolar, can be any low leakage type. IRF840 is 600v rated won't be a good match with 24v supplies. use irf540 instead.

      Delete
  38. Please sir i have 2 questions,

    (1) What is the approximate voltage from ur sine wave oscillator.
    (2) And can ic Rc4558 dual operational amplifier be used in place of the lm324?.thanks sir,please reply.
    Jerry from Nigeria.

    ReplyDelete
    Replies
    1. it will almost equal to 24V.

      if RC4558 is rated to handle 24V comfortably then you can use it.

      Delete
  39. Please sir,can you explain in details why it wont be possible to use the output from the sinewave oscillator to drive a pair of mosfet or bipolar transistors which will in turn switch current into a transformer, instead of using the second diagram you posted,please reply.thanks.

    ReplyDelete
    Replies
    1. A simple BJT or mosfet stage won't understand a sine wave, it'll start conducting fully the moment sine voltage exceeds 0.6V or 3V for mosfet.

      Delete
  40. Sir,can 2uf electrolytic caps be used without problem?,because am having issues finding the nonpolar type.

    And if polarized caps are ok,how should the caps polarity be connected in the sinewave oscillator?. thanks

    ReplyDelete
    Replies
    1. you can try polarized types also, the negative lead should go towards ground symbol

      Delete
  41. Dear sir what is the voltage ratings of all the caps in your circuit sir? thank you very much sir.. and can polyester caps be good sir? becoz i can't find 2uf nonpolar caps in electronic shops here.. thanks again sir..

    ReplyDelete
    Replies
    1. Hi Paul,

      all caps are rated at 50V, yes polyester will do.

      Delete
  42. Dear Sir,

    in your 2nd diagram sir.. is it ceramic caps? thank you very much...

    ReplyDelete
  43. Dear Sir,
    sir can i use 12v 20ah battery becoz i have issues finding 24v battery here in my country.. and is there some modification in the circuit to be able to use 12v battery.. thank you very much sir..

    ReplyDelete
    Replies
    1. Dear Paul,

      12V will do, but still you would require two of them...and also the output would become half of what could be achieved using 24+24V batteries.

      Delete
  44. Dear Sir, is it possible to shift the phase so the the output from the first IC TL072 and the second are at 120 degree? Iam thinking of adding a third OP AMP to get three outputs at 120 degrees shift. This will allow me to connect the three sine wave outputs to a power stage and transformer in order to get high power three phase.

    Can it work by varying the capacitors? I can also see that the gains are different at each output so we need to make them equal before feeding them to power stage. Could you please help with such design sir?

    ReplyDelete
    Replies
    1. You will need three separate driver circuits for it, you may refer to the following article:

      http://homemadecircuitsandschematics.blogspot.in/2013/10/three-phase-inverter-circuit.html

      Delete
  45. Dear Sir,

    is there any substitute for the transistor BD140,BD139&BC556 i can't seem to find it here in eletronics shop here in the phillippines

    thank you very much sir..

    ReplyDelete
    Replies
    1. Dear Paul,

      the mentioned components types are the most commonly available and standard, there no easier replacements for these

      Delete
  46. Hi sir i saw this circuit named Simple Pure Sine Wave Inverter Circuit - 500 Watt Pure Sine can this circuit be use for all day? my second question is can i replace 2uf with 2n2 400v ( 2.2nf,) or can use 2.2/50v electrolytic cos 2uf cannot be found here i therefore cherish the hope that my question will meet your kind consideration and approval thank you.

    ReplyDelete
    Replies
    1. Hi Edward, yes the circuit can be used for all day long if appropriate heasinking are provided to the devices.

      2.2nF will not do, 2.2uF could work, but it's better to use a 2uF cap[, you can use two 1uF in parallel for making a 2uF cap.

      Delete
    2. to get 2uf or 1uf non poly,another question the second circuit 82pf also is very ok but sir please i want you to help me in this circuit im not too much good in calculation so please don't turn your back on me,in the first circuit can replace 104,103,102,the green one? or 2.2uf/25v electrolytic cos sir in my country it difficultproblem can you tell me any value,3nd question all the two circuit there is no pot i mean variable resister im just asking sir thank you im looking forward to hear from you son. Simple Pure Sine Wave Inverter Circuit - 500 Watt Pure Sine

      Delete
    3. zinnaboy, you will have to make the circuit exactly as its presented, 2uF should be 2uF only, any other value will not do, use two 1uF caps in parallel. This project is a difficult project and is recommended for experts so please be cautioned.

      Delete
  47. ok sir i understand but one thing is can 473nf or 104 the green cap be replace 82pf?

    ReplyDelete
    Replies
    1. you cannot use other values in place of the recommended values, so please use only what's recommended in the diagram.

      Delete
  48. hai sir.i want to ask two questions
    1)For this circute ,what happens if i connect 12v 50ah singal battery?
    2)can i change step up transformer 12-012 10amps instad of 0-024v.if the center tap is connected to 12v 50 ah battery possitive?

    ReplyDelete
    Replies
    1. Hi Prasad,

      Single battery will not work because the above design uses a single winding push-pull configuration.
      12-0-12v will work, keep the center taps shorted and unused and use 2nos 24v batts.

      The above design is not a center tap type inverter so center tap cannot be used here.

      Delete
  49. sir please sorry for disturbing you ok,sir please can i replace 105/400vpp in place of 2uf,can 18pf be replace 82pf?. sir i want to ask you that where is the red line of the first circuit connect to cos it seem out put of the circuit is 2 out put? sir that is all my problem thank you.

    ReplyDelete
    Replies
    1. NO, you will have to do everything as given in the circuit.

      red line goes nowhere. the green output is to be used for feeding the inverter.

      Delete
  50. ok sir why im asking you is my country don't sell tantalum capacitor, sir plse what bout electrolytic capacitor 1uf/25v can i add 2 in parallel to get 2uf electrolytic it is going to work?thank you,

    ReplyDelete
    Replies
    1. biannz, don't try this circuit it's strictly not recommended for the newcomers, there are other simpler versions you can try them instead

      Delete
  51. ok sir but i have build some of your inverters circuit some of it work very well but it not a pure sine wave so if you said i should not go for this i agree but i need a pure sine wave inverter circuit so please refer me to which is not difficult i mean a pure sine wave ok sir even this circuit is not difficult build but some of the pats is not available here in my country that is why i to confirm from you if i can use this blab-la i guess your understand what i mean,thank you.

    ReplyDelete
    Replies
    1. biannz, pure sine wave circuits are difficult and only recommended for expert hobbyists, if you are confident you can go ahead wit the above circuit.

      all pats should be exactly as given in the schematic, you cannot replace them with other values, it will produce wrong results.

      Delete
  52. thank you sir,please there is resistor connected to emitter of BD140 it 1k resistor? sir im still confident to build it i have all the pats except 82pf that is the only one i don't fine anywhere.

    ReplyDelete
    Replies
    1. biannz, you can use 100pf or any other close value

      Delete
  53. ok sir thank you,my question is in the first circuit TL072 should i connects the positive of the batt to pin 8 of tlo72 and same to negative or it don't need any power from the batt it should build the way it presented?thank you.

    ReplyDelete
    Replies
    1. biannz, please check the datasheet of the IC and find out the Vdd(+) and Vss(-) pins of the IC.

      It will definitely need power from the battery otherwise it will never work.

      Delete
    2. ...pin8 is positive and pin4 is negative.....but apply 12V only.

      Delete
  54. sir can i use only 12v battery with this circuit

    ReplyDelete
    Replies
    1. yes, you can use two 12v batteries and connect them as shown

      Delete
  55. sir thank you sir please my question is in the firs circuit you did not show the positive sign of the capacitor i can see the 1k and the 2uf show negative so what about the tw0 cap 2uf on top of the circuit it the green lines a positive?
    another question can use the firs circuit to feed my four IRF540N in series with 56 ohm resistor to the G will it be work? third question can you please upload the full circuit of the diagram? thank you for spending your time on us we very greateful .

    ReplyDelete
    Replies
    1. biannz, use non-polar capacitors for those. you can put two 1uF non-polar caps in parallel if you are unable to get 2uF.

      Delete
    2. i did not understand your second question.
      I have already shown the full diagram in the 1kva inverter article.

      Delete
  56. ok sir but sir the two IRF540n got hot why sir? can i use only N- channel in the circuit or the 0.22 ohm resistor should change cos i suggest it becos of combination of the fets that why it got hot or my suggest is wrong? second what volt should the output of the TL072 be

    ReplyDelete
    Replies
    1. biannz, the mosfets should not become hot if the cirucit is built correctly.

      take the help of an expert electronic engineer who can schematics well.

      how can a n-channel work for p-channel?? think before you ask.

      0.22 are in fact for safeguarding the devices, so they are definitely not causing the heating issues, it's surely due to some hidden fault in your design.

      dont worry about the TL072 output, first make sure the inveter devices remain cool on switch.

      Delete
  57. OK sir but it IRF9540N a p-channel? if it is p-channel then it should go to the positive connection right,or no? thank you

    ReplyDelete
    Replies
    1. bianzz, everything's correctly configured in the shown inverter circuit according to the layout. follow it as it's shown...

      Any modification would result in fire and smoke.

      Delete
  58. pls sir, am doing a project on modified sine wave 3kva inverter and am using a microcontroller to produce the waveform....pls can you help me with a circuit diagram and the specification of the components to be used

    ReplyDelete
    Replies
    1. Auwal, I won't do the programming, I can try the remaining

      Delete
    2. thank you sir. i will be waiting for your feedback

      Delete
    3. please specify the things that you would need in the circuit

      Delete
  59. i will want it to have a voltage regulator, overload circuit, battery level indicator. if there is anything you could help me with that will make the inverter a little bit unique i will be happy. thank you sir

    ReplyDelete
    Replies
    1. please make the above basic design first, once you complete it successfully, i'll guide you through the subsequent stages as asked by you.

      Delete
  60. here is a diagram i got after a little research and i will like to replace the SG3524 with PIC16F628A or PIC16F628 and was wondering how to removing transformer 1 from the diagram. https://drive.google.com/file/d/0B6eo6OIGHPLkYlNiaXJGenBPOTg/edit?usp=sharing Thank you, will be waiting for your feed back

    ReplyDelete
    Replies
    1. for removing T1 you may incorporate the following circuit:

      http://homemadecircuitsandschematics.blogspot.in/2014/01/automatic-output-voltage-regulator.html

      Delete
  61. what of when replacing the SG3524 with the PIC16F628, will there be any modifications??

    ReplyDelete
    Replies
    1. there will be modifications, but I cannot specify them

      Delete
  62. ok! this diagram is for a 500W inverter, do u think by adding Q7 and Q8 transistors in parallel it can increase the power output. thank you

    ReplyDelete
  63. sir
    please can i use any N-CHANNEL AND P-CHANNEL fets in this circuit? the second circuit it the capacitor 4700uf or 470uf? 68pf can be replace 82pf?thank you.

    ReplyDelete
    Replies
    1. Daniel, the rating of the mosfets should be higher than the battery specs used for the inverter

      Delete
  64. sir
    please you did not answer my question as was expecting from you i ask three questions explain all for me so that the circuit will be so simple to build sir thank you.

    ReplyDelete

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