Thursday, May 24, 2012

Make This 1KVA (1000 watts) Pure Sine Wave Inverter Circuit

A relatively simple 1000 watt pure sine wave inverter circuit is explained here.


As can be seen in the first diagram below, the configuration is a simple mosfet based designed for amplifying current at +/-60 volts such that the connected transformer corresponds to generate the required 1kva output.

Q1, Q2 forms the initial differential amplifier stage which appropriately raises the 1vpp sine signal at its input to a level which becomes suitable for initiating the driver stage made up of Q3, Q4, Q5.

This stage further raises the voltage such that it becomes sufficient for driving the mosfets.

The mosfets are also formed in the push pull format, which effectively shuffles the entire 60 volts across the transformer windings 50 times per second such that the output of the transformer generates the intended 1000 watts AC at the mains level.

Each pair is responsible for handling 100 watts of output, together all the 10 pairs dump 1000 watts into the transformer.
For acquiring the intended pure sine wave output, a suitable sine input is required which is fulfilled with the help of a simple sine wave generator circuit.

It is made up of a couple of opamps and a few other passive parts. It must be operated with voltages between 5 and 12. This voltage should be suitably derived from one of the batteries which are being incorporated for driving the inverter circuit.

The inverter is driven with voltages of +/-60 volts that amounts to 120 V DC.

This huge voltage level is obtained by putting 10 nos. of 12 volt batteries in series.


The below given diagram shows a simple sine wave generator circuit which may be used for driving the above inverter circuit, however since the output from this generator is exponential by nature, might cause a lot of heating of the mosfets.
A better option would be to incorporate a PWM based circuit which would supply the above circuit with appropriately optimized PWM pulses equivalent to a standard sine signal.
The PWM circuit utilizing the IC555 has also been referred in the next diagram, which may be used for triggering the above 1000 watt inverter circuit.






Parts List for the sine generator circuit


All resistors are 1/8 watts, 1%, MFR
R1 = 14K3 (12K1 for 60Hz),
R2, R3, R4, R7, R8 = 1K,
R5, R6 = 2K2 (1K9 for 60Hz),
R9 = 20K
C1, C2 = 1µF, TANT.
C3 = 2µF, TANT (TWO 1µF IN PARALLEL)
C4, C6, C7 = 2µ2/25V,
C5 = 100µ/50v,
C8 = 22µF/25V
A1, A2 = TL 072

Part List for Inverter

Q1, Q2 = BC556

Q3 = BD140

Q4, Q5 = BD139

All N-channel mosfet are = K1058

All P-channel mosfets are = J162

Transformer = 0-60V/1000 watts/output 110/220volts 50Hz/60Hz


The proposed 1 kva inverter discussed in the above sections can be much streamlined and reduced in size as given in the following design:

The diagram also shows the method of connecting the battery, and the supply connections for the sine wave or the PWM oscillator stages.

Here just four mosfets have been used which could be IRF4905 for the p-channel, and IRF2907 for n-channel.



Complete 1 kva inverter circuit design with 50 Hz sine oscillator


168 comments:

  1. hi mr swagatam about the transformer how is it wired to the inverter? im confuse! Regards

    ReplyDelete
    Replies
    1. Hi Roger,

      The circuit operates at +/-60 volts which are derived from 10 nos of 12 batteries. All the 10 batteries are arranged in series, the joint at the 5th/6th battery +/- points becomes the ground, while the end terminals of the series become the positive and the negative of the supply.

      The transformer is connected across the mosfets and the ground derived from the 5th/6th connection battery.

      Regards.

      Delete
    2. ok so the transformer must be a center tapped for this configuration im just concern because on the circuit it doesn't show a center tapped transformer, what is the need for a 60-0-60v primary or both ends meet together? Regards.

      Delete
    3. No, the transformer does not have a center tap, rather the supply has a center tap.

      The center tap of the supply is derived from the 5th/6th battery connection and connected to one of the transformer ends, indicated as earth.

      This earth also becomes the negative point of the sine generator or the PWM circuit.

      Delete
    4. hi sir about charging the batteries how will it be possible?
      Regards.

      Delete
    5. You will have to build a special battery charger unit using a made-to-order 120V sec. transformer, rated at 1/10th of the involved battery AH.

      Delete
  2. does this circuit suitable to run all appliances......or do you build it and it is working successfully...and a another question,does this inverter be used as a full time inverter.....i am very fascinated by your great work, hoping to hear from you soon. D-tech

    ReplyDelete
    Replies
    1. Thank you D-tech,

      I have not tested the design practically but I believe that it will work perfectly and give optimal results with all related applications.
      The mosfets will need to be matched though, for correct functioning.

      Regards.

      Delete
    2. Sir Swagatam,
      (1) I dont understand the last line "The mos.....ing". What is it and how can it be ensured?
      (2) Can a complete ups be made around this circuit? with charging etc etc?
      (3) Im assuming output voltage is 220 ac,

      Regards
      Ali

      Delete
    3. Will a cooling fan help to keep the many transistors cool? Any heat sink available for them?

      Delete
    4. Hi Ali,

      Matching mosfets wouldn't be required here because of the associated 0.2 resistors with each mosfet so you can ignore the message.

      Complete ups can be made after employing the necessary changeover relays and battery charger stage.

      output voltage will depend on the selected transformer specs, can be dimensioned to a 120v or 220V as per requirement.

      Delete
  3. ok thanks......great job man...your work is well appreciated D-tech

    ReplyDelete
  4. hey Mr. Swagatam

    Please give me the detail making of pure sine wave inverter for 12v dc to 230v ac for home use

    which i could make myself
    regards

    ReplyDelete
    Replies
    1. Hi Rajan,
      you may try the one shown in this article, use just 4 mosfets initially and see the results.

      Regards.

      Delete
  5. i like to make a pure sine wave inverter for dc 220 volt to ac 220 volt. can u send a circuit to me.
    regards,
    m.siva subramanian

    ReplyDelete
    Replies
    1. You can try this circuit:

      http://homemadecircuitsandschematics.blogspot.in/2012/05/how-to-make-transformerless-inverter.html

      just feed the input from a sine generator circuit...........

      Delete
  6. Mr. Swagatam

    can this circuit run a PA system with 8 10' speakers? ty

    ReplyDelete
    Replies
    1. According to m, it should be OK to run a PA with this inverter.

      Delete
  7. Hi sir, i am navanithan im studying BE EEE Dept so i have large interest for to make a no of project. First i have a 1000watts inveter and 2000watts sound amplifier using power ic. So i have need to some help from you. So please give the above circuit with description and range then i will start the project. Thanking you sir

    ReplyDelete
    Replies
    1. Hi Navneetha,

      You can try the 1000 watt inverter circuit shown in the above article.

      I provided the necessary explanation in the article.

      Regards.

      Delete
  8. sir i want to exchange panel to other materials what can we use

    ReplyDelete
  9. what is the efficiency of this circuit

    ReplyDelete
  10. Swagatam,

    could this inverter be powered by 24 volt battey (2 12 volt battery) and get 120v a/c out from the transformer. what would i have to change?

    thank you, DEREK

    ReplyDelete
    Replies
    1. Hello Derek,

      You won't have to change anything, just upgrade the transformer rating as per the required output.

      voltage to A1/A2 circuit should be supplied from one of the batteries (12V).

      Delete
  11. haii sirr...i'm very much interested nd fascinated with ur wrks....
    is dis inverter is economical dat using 10 batteries...those many mosfets etc...
    i wanna make this in my home sir...so plss kindly help in dis regard...
    thank u sir..
    and using ic555 u hadd given a circuit on pwm technique...wat is d purpose of dat nd hw cn dat relates to the inverter..i,m unable to understand plss gve me some xplanation sir....nd even the above information...
    thank u sir...awaitng for ur reply sir...

    ReplyDelete
    Replies
    1. using higher voltage makes the design less complicated, compact and allows smaller transformer to be used.

      you can reduce the mosfets numbers by using modern higher rated mosfets.

      555 PWM input will enable to tailor the output RMS as per the standard AC RMS value.

      Delete
  12. Hello sir,

    I am Naresh from Hosur, presently i am working in Ashok leyland ( Dept - Product Development).

    Can u pls advise me how to make a 1KVA inverter using a 12 V car alternator? It's possible to make inverter using alternator?

    Thanks,

    Naresh

    ReplyDelete
    Replies
    1. Hello Naresh,

      A 1 kva inverter would require a 100 to 200 ah current at 12V for satisfactory operations, an alternator won't provide that much of current so the idea isn't feasible.

      Delete
    2. OK sir...

      I have a 12V 75 AH alternator. how much of power can produce using this?

      Thanks
      Naresh

      Delete
    3. Do you mean 75 Amps? because alternators are not rated at AH rather only in amps.

      even at 75ah, you would get 12 x 75 = 900 VA max.

      This would be its extreme limit, and would damage the alternator very soon.

      Delete
    4. Yes sir it is 75 Amps Alt. Thanks for your valuable informatio and swift reply.

      Sir i have a doubt. I want to convert 16 V 75 A AC to 12 V 75A DC. What type of Diode bridge (for rectifying) (eg. 1N4007 or) and resistor (for limiting voltage) should i use?

      Thanks
      Naresh

      Delete
    5. You will have make the circuit which is shown in this article, don't use the diodes which are placed at the ground of the IC.

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

      You'll have to put 4 transistors in parallel including the emitter resistor.

      Delete
  13. HI swagatam sir, this mic. i want to made 500watts inverter from 12v source. what type of transformer i need to be use.how may amps transformer is the best one.i want to learn more about the trsnsformers which is the best one.

    ReplyDelete
    Replies
    1. Hi Mic, please refer to the following links, it has many detailed inverer circuit designs, you can choose any suitable one from them:

      http://homemadecircuitsandschematics.blogspot.in/p/sine-wave-inverters.html

      Delete
  14. Can this inverter run on 12 volts

    ReplyDelete
  15. What would i need to do to make this circuit work off 12 volt with a output of 120 volt

    ReplyDelete
    Replies
    1. with 12v supply the circuit would require a HUGE transformer, rated at around 100amps....so it's not recommended.

      Delete
  16. hello sir,,,
    i want to make 1000watt ups for home to run load of ceiling fans do u have any article or help related to it?

    ReplyDelete
    Replies
    1. To make an UPS you will need to make a inverter first, so you can begin with the above circuit, once you finish this I'll help you to proceed with the further things.

      Delete
  17. yes,i m trying to do,,but the problem is i have 12v 100amp battery and 1000watt transformer and want to use it for inverter,,but above circuit works on more than one 12 v battery which is very costly to me,,,if there is any solution? thnx

    ReplyDelete
    Replies
    1. The above circuit will work with 12V supply also, but with 12V supply a 1000 watt inverter will become too heavy with thick wires and huge heatsinks, that's why higher voltage is recommended.

      Delete
  18. Hi swagatam sir, tis is kabir, i have an enquiry, im doin a project and trying to power up an AC load of 230V from a solar panel rated at 50W 12V DC, can i do so using a power inverter with PWM as input as shown above? if not my mistaken,the circuit above has an output of 120V rite so defnitely my project cant support it as my country AC is 230V and the voltage input is how much DC (is it 12V DC)? any recommendations circuit to solve my problem? tq

    ReplyDelete
    Replies
    1. Hi Kabir,

      50 watt panel is too low to power an inverter directly, you will need at least a 100 watt solar panel for this.

      You can try a simple inverter circuit that's explained in the following article:

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

      Delete
  19. hi,im kabir here again,jus wanna add on for my previous question is that the load is a 1000W 230V and im using a 50W 12V solar panel as a source and a bank of probably rated at 200Ah, possible?

    ReplyDelete
    Replies
    1. That won't be enough, you will need a minimum 200 watt panel for charging a 200 AH battery within 6 hours, please confirm it further with your panel dealer

      Delete
  20. hey, i would like to build an inverter for 3-phase (380V) submersible pumps. The pump is rated 5.5kW and is used in a borehole...Can u help

    ReplyDelete
    Replies
    1. If possible I'll try to design it and post it for you soon

      Delete
  21. hey, please i would like to know the function of the function of c2 in the 555 pwm circuit. I need to connect a comparator to the 555 timer circuit for my switching supply

    ReplyDelete
    Replies
    1. C2 is for keeping pin#5 unresponsive to stray noise and disturbance that may be present in the supply and atmosphere

      Delete
  22. Hi, I'm building a hydro, as a generator I'm using truck alternator 24V 100A, could I use the above design inclusive PWM, and also what would I have to change in order to double its output to 2kV ?
    Thank you for your reply. Ladia

    ReplyDelete
    Replies
    1. Yes you can use it.

      You can increasing the input voltage and the trafo primary voltage appropriately for increasing the output wattage to the desired levels, without increasing mosfets nos.

      Delete
  23. Mr swagatam thank you for the good job sir i want to build this circuit named Make This 1KVA (1000 watts) Pure Sine Wave Inverter Circuit to power my house so please help me build it my 1th question im going for the LM555 where is that point show 3 to 15v dc from pin 4 of the ic lm555 going to connect second question in the TL072 A1,A2 where is the point show plus symbol from pin8 of the A1 connect and A2 pin7.can i use one of this mosfets IRFP250 IRFP260 AND 2N3205 OR 2N3055 please sir kindly help me cos we having a lots of problem in our electricity thank you i am looking forward to hear from you son.

    ReplyDelete
    Replies
    1. Hi Stev,

      you will need two 12V bats connected in series for operating the above inverter. Meaning together the battery will generate 24V

      The series connection will become the ground (earth symbol) of the system.

      For the IC 555, the positive of the battery which generates 24V will become its positive supply while the series link of the batts will become the ground of the circuit, same can be done for the A1/A2 circuit if it's being used in place of the 555.
      This also means that the earth or the ground of all the circuits can be made into a common line.
      pin7 of A2 will connect with the inverter input.

      Delete
  24. than you sir for the respond but sir there is one thing i don't understand in the mosfet you named some of the mosfet Q6,Q7,and Q9,Q9,please which of them are the N-channel mosfet K1058) and P-channel mosfets J162) in the Make This 1KVA (1000 watts) Pure Sine Wave Inverter Circuit,thank you stay bless looking forward to hear from you.

    ReplyDelete
    Replies
    1. I just cut/pasted the first mosfet section across for indicating the following identical moset stages, that's why it's showing a repetition of the same mosfet, please ignore it, and simply repeat all the section identically with 0.22 resistors on each and every mosfet source

      Delete
  25. thank you for the replied but sir i still don't get you right can you please come again or you mean all the 20 mosfets should be the same mosfets? and also the diode (1s207) i never head that kind of that diode before any diode can be use or what is the value of it? thank you looking forward to hear from you stay bless.

    ReplyDelete
    Replies
    1. all the upper n-mosfets are same and all the lower p-mosfets are same.
      you can use 1N4148 diode in place of the shown unknown diode.

      Delete
  26. ok sir thank you very much for the respond sir i build it but it dont work why sir is there anything i did not connected? ok let me tell you how i connect the circuit, in the 555 there is line that from it 7pin show (PWM pulses) i connected it with A1 pin8 that show positive symbol to the Btr positive im i right? and also i connected pin7 of A2 to the sine input sir in the 555 you connect pin4 and 8 together and you show 3 to 15v DC where is that going to? thank you sir for your time on me.i am waiting for you reply before i will continue the circuit Make This 1KVA (1000 watts) Pure Sine Wave Inverter Circuit.

    ReplyDelete
    Replies
    1. There are many things that must be taken care of here. The circuit will require a dual battery supply, example 2nos 24V batts in series. the series connection will become the ground.
      the preset will need to be adjusted correctly or alternatively it can be simply replaced with two series connected 1N4148 diodes, anode up, cathode down.
      try with the 555 circuit first and using just two mosfets

      Delete
  27. sir im very confused why becos in the parts list there is C4,C6,C7,C5,and C8 while its not in the circuit i can only see C1, C2, and C3 in the op am TL072 sir im talking about this circuit Make This 1KVA (1000 watts) Pure Sine Wave Inverter Circuit here are the parts list

    All resistors are 1/8 watts, 1%, MFR
    R1 = 14K3 (12K1 for 60Hz),
    R2, R3, R4, R7, R8 = 1K,
    R5, R6 = 2K2 (1K9 for 60Hz),
    R9 = 20K
    C1, C2 = 1µF, TANT.
    C3 = 2µF, TANT (TWO 1µF IN PARALLEL)
    C4, C6, C7 = 2µ2/25V,
    C5 = 100µ/50v,
    C8 = 22µF/25V
    A1, A2 = TL 072

    Part List for Inverter

    Q1, Q2 = BC556

    Q3 = BD140

    Q4, Q5 = BD139

    All N-channel mosfet are = K1058

    All P-channel mosfets are = J162

    Transformer = 60-0-60V/1000 watts/output 110/220volts 50Hz/60Hz

    ReplyDelete
    Replies
    1. zinnaboy, please follow the diagram only, I might have put the parts list of "simple sine wave inverter" which is quite similar to the above design.

      So please follow the diagram only.

      Delete
  28. sir this circuit Make This 1KVA (1000 watts) Pure Sine Wave Inverter Circuit there is something that confused me a little bits im going for 555 where is that arrow from pin 7 of 555 connect i mean PWM pulses,also where is the pin 8 from A1 connects sir? sir sorry for bordering you cos i really want to build this circuit i have all the parts here its cost me so i don't want to waist it i want to hear from you before i will start thank you.

    ReplyDelete
    Replies
    1. Hi Biannz,

      Please note that the above designs are not tested by me so make it at your own risk and only if have understood the concept perfectly.

      the above inverter will require two batteries connected in series, the positive and the negative connections will go to inverter positive and negative.
      The series connection will go to the line which shows the ground symbol.
      And the positive of the battery will go to the positives lines of the ICs A1/A2 and 555.
      The output of 555 will go to the input of the inverter.

      The grounds of the inverter and the pwm circuit should be made into a common line.

      Delete
  29. thank you sir for the humble replied cos some time we asked questions that almost make you upset but becos of the sacrificed you ignore and answer thank. so if i understand well the out put of 555 and out put of A1/A2 should connect to the inverter in put right?

    ReplyDelete
    Replies
    1. yes that's correct, but make sure you do the connections as instructed in the previous comment.

      Delete
  30. hi sir i build this circuit Make This 1KVA (1000 watts) Pure Sine Wave Inverter Circuit but the fets got hots without load please help me solve the problem thank you sir

    ReplyDelete
    Replies
    1. Hi Bianz, connect small flashlight lamps in series with positive and the negative lines of the circuit...these lamps should be rated at the battery voltage level.
      now without connecting any load switch ON power to the circuit.
      The flashlights will light up brightly, now carefully adjust the preset until the lights just shut off. This setting will ensure that your mosfets stay cool when there's no load.

      Delete
  31. thank sir but one thing is that when i switch on the power to the circuit the 0.22 ohms resister blow i used only 2 fets (K1058),(J162) for trying before i go ahead and build bigger one please i need your help sir.

    ReplyDelete
    Replies
    1. biannz, keep the trafo wire disconnected initially, and connect it after power switch ON, if still it the 0.22 blows off means there's something seriously wrong with your circuit.

      Delete
  32. hi Sawagatam, I am new here but you seem to be in the know. I have some 250volt 250watt solar pannels and some 30 12 volt 240ah batteries, I want to make a transformerless inverter, do you have any sugestions for me? like battery pack voltage. I was thinking of about 216vdc before switching as I know that this will affect the ac voltage.

    ReplyDelete
    Replies
    1. Hi Simon, you will need a full-bridge inverter (without transformer) circuit for implementing the application.

      I'll be publishing one such circuit soon in this blog, in the meantime you can search it online to get a idea about the design.

      The batteries can be connected in series for getting the required 216V.

      Delete
    2. sir thank you sir i did it a exactly as you said but still blowing the fest and the resistor it happening to one side i used 2 most fest N-channel mosfet K1058
      channel mosfets J162 , sir in the inverter i use 18pf in place of 15pf,and the resistors i used 5.6 in place of 5.1 cos it not aveable here im asking sir is it the cost of problem? sir i will be very glad if will be able to build this circuit so please sir help me sir thank you i hope to hear from you son.

      Delete
    3. biannz, the preset needs to set correctly first....alternatively you can replace the shown preset with two 1N4148 diodes back to back in series. anodes will be upwards and cathodes will be downwards.....

      Delete
    4. hi sir i understand but want to ask you a little question where is the 1k resistor which indicate ground connect to is it connect to the positive and negative center of th batt or directly to the negative of the batt which generate 24v? thank you your assistant.

      Delete
    5. hi biannz, pls see the last diagram, i have shown how to connect the batteries and the supply connections for the oscillator circuit

      Delete
    6. ok thank you sir but one thing is how can i post or upload so that you can see pics can you give me your email address if you don't mind? i prefer to chart with you live but i don't think that would be possible thank you sir.

      Delete
    7. you can use Google drive and create a image link through it and provide me with the link.

      Delete
    8. sir please can i use two 12v batt in series for test?

      Delete
    9. yes can be used but it will give 50% less power

      Delete
    10. ok sir please i sent you some pics to this email homemadecircuits@gmail.com please check and correct it if any wrong connection.

      March 24, 2014 at 3:41 PM

      Delete
    11. bianzz, i cannot check your circuit due to lack of time...you will have to do it yourself.
      You should first make it on a general purpose board going for a PCB

      Delete
  33. .....than compared to two 24V batteries

    ReplyDelete
  34. sir please i have sent you a pic of the three circuit i have connect all so please kindly check it out if it correct or not im waiting for your reply sir thank you.homemadecircuits@gmail.com

    ReplyDelete
    Replies
    1. The connections are wrong.
      do it exactly as shown in the last diagram above.
      Use only one pwm circuit out of the two which are shown, either the one which uses the two opamps or the the one with 555 IC.

      Delete
  35. sir so you mean only two circuit should be connect not all the three circuit,i should chose any of them to connect the inverter isn't it sir? i have sapirate them see the connection if not please correct it and send it to this email address(
    danieladusie@gmail.com) this is the email address that i sent to(homemadecircuits@gmail.com)

    ReplyDelete
    Replies
    1. biannz, please see the last design in the above article.

      Delete
  36. thank you sir so can i use the one with ne555 too if want? i mean can i chose one of the two circuit to feed the sine input any of them with the same connection?

    ReplyDelete
    Replies
    1. Yes you can use 555 pwm input also, connect it in the same manner as done for opamp oscillator

      Delete
  37. ok sir thank you for respond,sir please i want to know if this circuit can handle or supply 5 BIRD ROM with one LCD flat-mar TV one refrigerator 5 ceiling fans and two computers? sir i want to use 4 12v solar the bigger and 0-48 Tranf and also good heat sink for the fets,sir if you confirm that this circuit
    Complete 1 kva inverter circuit design with 50 Hz sine oscillator can handle the house then i use solar panall instead of electricity to charge the BTT,thank you sir.

    ReplyDelete
    Replies
    1. Biannz, according to me the above design will be able to handle the specified appliances....however I cannot provide guarantee for anything.
      Better to build a smaller version by using two mosfets, two 12V 7.5 ah batts, if everything goes right as per the expectations, you can proceed by upgrading the stages appropriately.

      Delete
  38. ok sir i understand you very well it a good i dear i will do exactly as you said.

    ReplyDelete
  39. sir please i need your help i finish build this circuit but unfortunately i did not gets 0.2E so i used 0.22E the problem is when i connect the 0.22E and the fets got very hot and it almost burn.

    ReplyDelete
    Replies
    1. biannz, remove the sine oscillator input, and short circuit the inverter input to ground and then check whether the mosfets are getting hot or not.

      If yes, then there could be something not correct with the connections.

      Delete
  40. sir thank you sir please i did as you said but it still got hot sir i build the circuit as the way it is i go over and over i check every the circuit i connect everything where it should connected so sir my observation i didn't miss the connection so please help me

    ReplyDelete
    Replies
    1. without an input signal the fets will never heat up, i have the tested the design and it worked perfectly for me.
      you circuit has some fault for sure get it checked by a expert.

      i had cautioned you before not to try something which you cannot troubleshoot yourself.

      Delete
  41. sir i use Proteus and tell me IRF2907 have no model specified,simulation failed due to partition analysis error(s) sir tha is how it tell me so what does that mean? any help?

    ReplyDelete
    Replies
    1. biannz, for simulation purpose you can use any n-channel and p-channel mosfets in the circuit.

      Delete
  42. sir please in this circuit it Q8 AND Q9 N-channel or P-channel?

    ReplyDelete
  43. Hi Swagatam

    Recently, the transformer of my UPS (purchased from market 3 years ago) is becoming very hot, such that strong smell can be felt in the room.

    What could be the reason?

    ReplyDelete
    Replies
    1. Hi Abu-Hafss,
      May be it incorporates some kind of voltage regulation circuitry which has failed now and as a result excessive voltage and current is being fed to the transformer input winding.

      Delete
  44. Transformer = 60-0-60V/1000 watts/output 110/220volts 50Hz/60Hz
    what do mean 60-0-60?

    ReplyDelete
    Replies
    1. sorry, it should be 0-60V and not 60-0-60

      it's the voltage rating of the primary side winding of the inverter transformer.

      Delete
  45. how to we can 20 volt dc convert into the ac 220 volt please

    ReplyDelete
    Replies
    1. you can try the following circuit:

      http://homemadecircuitsandschematics.blogspot.in/2014/06/simple-high-voltage-generator-circuit.html

      Delete

  46. please lm555 will produce the same sine wave as tlo72 oscillator?

    ReplyDelete
    Replies
    1. 555 will produce pwm modified pure sine wave, A1, A2 will produce exact pure sine wave

      Delete
  47. sir

    i want to try this circuit again but my problem is the 15pf i search every where but i don't get it, it very difficult

    ReplyDelete
    Replies
    1. daniel, you can try any closer value, it's not so critical

      Delete
  48. sir please can i use variable resistor to adjust so that i can get 14k3 or 12k1 cos it difficult to get that value can i?

    ReplyDelete
    Replies
    1. yes you can use presets for adjusting the values

      Delete
  49. in the parts list you have a "2µ2" value for C4, C6, C7 I cannot find such a value was that a typo?

    ReplyDelete
    Replies
    1. yes it's a typo from the previous extraction, just remove the Â

      Delete
  50. ok one more thing the 2uf capacitors which I should put two in parallel are they the big 250v/450v caps found in fans because that's mostly what I see.

    ReplyDelete
    Replies
    1. No, these are small 25V rated, tantalum types are preferred for their low leakage properties and high accuracy.

      Delete
  51. if thats correct which voltage caps should I use.

    ReplyDelete
  52. sir
    please can i use this TL072 oscillator to connect to another circuit you named it simple pure sine wave? that simple pure sine oscillator also use tl072 but i don't want to use that circuit i prefer this the second oscillator, can i use it for that simple sine wave power stage? thank you.

    ReplyDelete
    Replies
    1. daniel, yes you can use the PWM version with that circuit input

      Delete
  53. ok sir thank you im going to try it

    ReplyDelete
  54. sir please i build this oscillator TL072 it work very well i got correct pure sine wave but if i connect it to the inverter the fets and the 0.22 ohm resistor got very hot can you help me with that? i tried to send you the pic but it couldn't go through but i well try again after hearing from you,please don't forget to answer this too,sir please can i use irf540n in place of irf2907? thank you

    ReplyDelete
    Replies
    1. on what situation are the fets heating up? on power switch ON... without input signal and without load...or under what conditions?? please specify.

      Delete
  55. ok sir
    im trying to troubleshot if i couldn't i well inform you so that you can you can help me,but please answer this for me sir please i want to use this TLO72 oscillate for center tap transformer may be one of your cd4017 circuit i think it have one in put or it can be possible?thank you hope to hear from you.

    ReplyDelete
    Replies
    1. i did not understand what you are saying....

      Delete
  56. sir i mean i want to use the tl072 circuit to feed cd4017 circuit so that i can use center tap transformer cos the cd4017 it have one input which is pin 14 the out put is many but we anomaly use pin2 and pin7,you have cd4017 inverter circuit so i want to cut it pmw and use this tl072 sine wave oscillator, can it work? sir please my English is not good so please try to understand what mean thank you.

    ReplyDelete
    Replies
    1. No, that's not possible! It doesn't work that way.

      Delete
  57. sir
    please i have sent you some wave form of TL072 oscillator check it out if it better cos if i connect to the inverter it dont work one side got very hot almost blow my fets any help sir?, thank you.

    ReplyDelete
    Replies
    1. Daniel, is the heating happening with loads connected or without loads?

      and when the input sinewave input is removed are the mosfets returning to normal temperature?

      what rating transformer did you use?

      did you check the quiscent current of the circuit.

      did you connect the two 1N4148 diodes at the collector of Q3?

      Delete
  58. yes sir the diode is connected, it got hot without load ,i use IRF540N in place of IRF2907 cos IRF2907 it difficult to get it,or can you please tell me common N-CHANNEL MOSFETS?

    ReplyDelete
    Replies
    1. daniel, do not connect any input signal, initially keep the input 22k end shorted to ground.

      now power the circuit with small 12V flashlight bulbs in series with the battery supply lines (+) and (-).

      If the bulbs glow brightly would mean something's wrong with your circuit.

      The bulb glow will suggest that the quiescent current is too high for the circuit and it has not been configured correctly.

      in a good circuit the bulbs will stay shut off

      Delete
  59. God day Sir
    I would like to ask for your help if you have a 5kw pure sine wave inverter. with an input/output 24Vdc/250Vac 60 hertz design. I'm very much fascinated with your designs. I would highly appreciate it if you could help me with this.
    Thanks and best regards.
    Radley

    ReplyDelete
    Replies
    1. Hi Radley, you could probably try the following design, you can try replacing the ferrite core trafo with a standard iron core transformer having 5kva rating

      http://homemadecircuitsandschematics.blogspot.in/2014/07/5kva-ferrite-core-inverter-circuit.html

      Delete
  60. I'm very much fascinated with your design. I would like to ask for your help if you also have a design for 5kw pure sine wave inverter and an input/output of 24Vdc/250Vac 60hertz. I would highly appreciate it if you share it with me.
    Thanks and best regards.
    Radley

    ReplyDelete
  61. hi sir long time yes am was very busy,so now am back to the blog th last time i said this circuit got hot you answer me but unfortunately i couldn't do it as you said so now i have a time am going to stat it so i will come for your aid if

    ReplyDelete
  62. sir plse can i use irf540n in place of irf2907? thank you.

    ReplyDelete
  63. the transformer used in this circuit has a 60v primary and 110/220 output at about 10amps where can I get such a transformer?

    ReplyDelete
    Replies
    1. 60v or higher trafo is used for minimizing the current requirement of the inverter, you could as well use a 12V trafo with a 12-0-12V batt for the same results, but that would mean the amp rating going up significantly.........

      Delete
  64. Oops forgot to mention in the tricky challenge.........it would be far better if a swich for sinewave,squarewave,traingle and sawtooth wave. if not at all possible,make it sinewave alongwith PAM/PWM/PPM controller

    ReplyDelete
  65. Could a 12-012 transformer at 10amp be used and does it mean I could only use a single 12 volt battery

    ReplyDelete
    Replies
    1. yes a 12-0-12 trafo can be used with a single 12V battery, in fact the trafo could be a 9-0-9v ideally.

      Delete
  66. In that case look at the connection in the diagram that the positive lead from the battery on the right connected to q7 would that connection still be made using one battery or just the portion with the battery to the left?

    ReplyDelete
    Replies
    1. I am sorry, ignore the previous comments by me...a center tap trafo and a single battery will not work for the above 1000w inverter concept....

      Delete
  67. The transformer i have is 12-0-12 i used on 12v battery and i didnt get any out out, the fets got hot in seconds so can i use 2 12v batteries in series and use that same transformer that i have

    ReplyDelete
    Replies
    1. yes a dual battery is required for the design so use two 12v batts iin series...
      in the transformer, use any of the 0-12 tap

      Delete
  68. I tried but still no volt out from the transformer the fets get hot

    ReplyDelete
    Replies
    1. remove the trafo and the input and then check if the fets are getting hot or not

      Delete
  69. Replies
    1. Dear swagatam r u test this design by ur self or just present your theoretical view on this design because your most viewers complaining about geting hot issue of fets's and 0.22 ohms resistor plz answer sincerely thanks

      Delete
    2. Dear Asim, it's based on theoretical simulation, but if I happen to make it i would be able to achieve 100% results from this design....if others are not able to succeed it's their inability.

      Delete
  70. The fets dont get hot at all when i remove the transformer

    ReplyDelete
    Replies
    1. it means something's wrong in your circuit, because without any input frequency and without any load the fets should not conduct and should not become hot....
      what's the quiescent current that you have measured?

      Delete
  71. sir please can you tell me what is the purpose of the two 1n4148 diode pleas tell cos i got 12v at the collector of Q5 and Q3 it is okay to to get that kind of voltage at these two Q3 and Q5?

    ReplyDelete
    Replies
    1. the two diodes help to get the required variable duty cycles from the IC

      if your batteries are 12-0-12 then the results are OK...

      Delete
    2. sorry if the batts are 24-0-24 then 12V across the fet gates is OK...

      Delete
  72. ok will connect and check if I am getting 12v accross each gate, but if thats the case and I re-connect the transformer and still no output what do you think would be the problem, because I am using a 24-0-24 battery setup and the transformer is 12-0-12 5amp

    ReplyDelete
    Replies
    1. please don't comment with different names...it gets very confusing...are you daniel adusei??

      you have been attempting the circuit since last 6 months and still having problems, i advised to quit this project and I repeat it once again....try some other easier inverter design... there are plenty of them in this blog.

      Delete
  73. I started the circuit last week im ainsworth lynch.... You told me to remove the transformer and test accross the gates of each fet...

    ReplyDelete
    Replies
    1. check the quiescent current by shorting the input of the circuit ground and trafo connected. it should be around 50mA, in the second last circuit

      Delete
  74. I got 12 volts accross gate and grounds of each fet...

    ReplyDelete
  75. probably Ill just try another design, I wanted to complete this but I dont know why I can get any output from the transformer.

    ReplyDelete
    Replies
    1. sure, there are many good designs in this blog, much effective and easier than the above design but will not produce pure sine wave...

      Delete
  76. Ill try the 3kva sine wave inverter that i see you posted

    ReplyDelete
  77. hi sir please i did not sent you a message with different name my name is daniel adusei and my profile pic is sine wave symbol sir i now got out put of transformer and the sine wave but what im facing now is if i power the circuit the out put of transformer raise up and it drop down within a seconds the upper fet got worm any help?

    ReplyDelete
    Replies
    1. daniel, you'll have to use large heatsinks to control the heating issue because since this is not a PWM based circuit, some heating will be take place.

      Delete

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