simple pure sine wave inverter circuit - 500 watt pure sine.pdf

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Posted by Swagatam Majumdar Simple Pure Sine Wave Inverter Circuit - 500 Watt Pure Sine

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

The circuit basically uses a push pull topology through a couple of 24V batteries. The use of two 24Vbatteries 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 atwo wire ordinary transformer becomes suitable here.

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

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

The sine wave generator produces a pure sine wave output with the shown components at about 50Hz, forother 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 asthat 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 beseen 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 pulleffect over the attached transformer.

With a 0-24V/25amp transformer, and a couple of 24V batteries the circuit would be able to generate ashigh 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 thesecond circuit for initializing the proposed operations.

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at Saturday, April 27, 2013 Labels: Inverter Projects, opampReactions:

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156 comments:

hassan mwachuo April 28, 2013 at 6:39 PM

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

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Swagatam Majumdar April 28, 2013 at 10:02 PM

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

hassan mwachuo April 29, 2013 at 2:24 AM

How can we improve it for a stable output voltage

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roderel masibay April 29, 2013 at 7:22 AM

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

Reply


Hi Roderel,

It's can be a huge subject, cannot be explained through comments, you may refer to thesearticle, 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

Anonymous April 29, 2013 at 11:17 AM

Hi Swagatam

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

Regards

Reply

Swagatam Majumdar

I am an electronic hobbyist,inventor, a freelance electroniccircuit designer, manufacturer. Iam also an avid publisher, I

enjoy posting electronic related articles in mywebsite: http://www.homemade-circuits.com/ where the interested viewers get theopportunity to read many innovativeelectronic circuit ideas, exclusively designedand developed by me.

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yes it can be tried here.

Anonymous April 30, 2013 at 8:55 AM

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

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Hello Luis,

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

girish sonawane May 1, 2013 at 8:13 PM

thanx sirji i think its very usefull to all cozhere all ur fans looking for such cktsirji i want knoe that which x'mer used here to obtain max wattageis this xmer is 24-0-24 20amp transformer

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Swagatam Majumdar May 1, 2013 at 9:55 PM

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.

Anonymous May 2, 2013 at 6:18 AM

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

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Anonymous May 4, 2013 at 7:55 PM

Hi Swagatam

There are two questions I would like to ask:

1. Efficiency of this inverter2. If I use salvaged power transformer (heavy iron core type, 50hz) from an APC UPS 650, how it can beused in 12V+0+12V circuits since its windings are 8 to 9 volts each instead of 12V. How am I supposedto use such transformers in schematics mentioned at your site, would u like to suggest any change inschematic etc.?

Regards

Sam

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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 alittle higher than the rated 220V, so even at lower input voltages the output would stickaround 220V.


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Regards.

SHIV-FOUNTAIN August 3, 2013 at 12:02 PM

Hi dear sir for testing purpose instead of battey can i use power supply for giving a supply tocircuit.Please reply me on Email id taht is;[email protected]

Thanking you

tessy May 4, 2013 at 8:59 PM

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

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very good sirand no charger / automatic changeover section?

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thanks, will try to to update them also...


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 thewinding 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 squarewave inverter may slowly damage it due to extra transients since it was made for a sine wave and notfor square wave. I think square wave transformers are made with extra winding (head room fortransients) but am not sure what do you say?

Regards

Sam

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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 youcan 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'sthe wattage consumption at the output that may be responsible for heating up thetransformer, if it's controlled appropriately, things would be all right.

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

suneetha thanda May 10, 2013 at 9:55 PM

hi swagatam

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


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regards,

suneetha

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Swagatam Majumdar May 11, 2013 at 10:07 AM

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


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 transformlow DCV to high DCV (H-bridge)using FETS and small HF transformers, and then modulate for puresine 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 usingsmall transformers.

Hope you take my proposal under consideration

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Thanks!

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

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


Dear Sir, Could you post better resolution picture for second circuit, i can't read resistor's valuesGrateful

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Use the "zoom" feature at the bottom right of the page...you would be able to figure out all thedetails.


Dear sir,

Sorry to bother you again with this, i've tried to zoom in but still can't figure out somenumbers, specifically:R9-R10 - i see 1K(something) i assume 1K0 meaning 1K OhmR19-R20-R21-R25- i see (somthing)E22 i assume 0E22 meaning 0,22 OhmR24 i assume 10E meaning 10 OhmsQ7-Q8 i assume BD140also 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 thatmeans spending money on parts, and dont want to make mistakes.


yes everything noted by you is correct to the point.


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

Anonymous June 10, 2013 at 8:00 PM

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

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Swagatam Majumdar June 11, 2013 at 9:38 AM

helo jay,

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

Anonymous June 11, 2013 at 7:02 PM

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

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you are welcome!!

WeiZhuan July 22, 2013 at 8:54 PM

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 toinvert that output to an AC form. Can I use this circuit?

Thanks

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Swagatam Majumdar July 23, 2013 at 10:35 AM

Hi Mr.Weizhuan,

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

WeiZhuan July 23, 2013 at 8:53 PM

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-bridgeinverter configuration. On circuit (I'm using Proteus) it works but when I implement onhardware, it doesnt.

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

Thanks


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


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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

SHIV-FOUNTAIN August 3, 2013 at 11:55 AM

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

thanking you in adavnce

Reply

SHIV-FOUNTAIN August 3, 2013 at 11:55 AM

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

thanking you in adavnce

Reply

Swagatam Majumdar August 3, 2013 at 6:35 PM

Thanks Shiv,

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

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

Anonymous August 7, 2013 at 3:37 PM

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

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Swagatam Majumdar August 8, 2013 at 10:26 AM

The above circuit works with two batteries, you can use two 12V batteries but the relativepower 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 atmax current range on other side of the trafo for a few seconds until you get the requiredcurrent reading.

Isaac August 9, 2013 at 3:29 AM

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

Swagatam Majumdar August 9, 2013 at 9:40 AM

you can try LM324 in place of TL072

Isaac August 9, 2013 at 12:47 PM

Thank U so much. God bless U!


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Paul September 15, 2013 at 2:27 PM

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


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


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

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Swagatam Majumdar September 16, 2013 at 7:47 PM

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.


Dear Sir,

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

thanks...


Dear Paul,

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

Anonymous September 25, 2013 at 7:34 PM

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 transformeris it 12 volt to 220 volt transformer?what is the value of the first winding " voltage "thanks in advanceregards,MICHAEL

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Dear Michael,

The primary should be equal to the battery voltage, in the above figure it is 24V primary, and220VV secondary(output)


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

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

Anonymous September 26, 2013 at 12:52 AM

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

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


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?

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


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

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Thanks,

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

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



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Dear sir,

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

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Dear Paul,

yes you can use it.

Anonymous October 2, 2013 at 10:41 PM

Dear mr swagatam, what should the output be in the fisrt schematic(sinewave generator)? if i input 12volts 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

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Anonymous October 2, 2013 at 11:36 PM

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

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Swagatam Majumdar October 3, 2013 at 9:53 AM

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.

Paul October 6, 2013 at 10:13 AM

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

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Paul October 6, 2013 at 11:16 AM

Dear Sir,

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

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Swagatam Majumdar October 6, 2013 at 9:26 PM

Hi Paul,

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

Anonymous October 8, 2013 at 1:23 AM

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

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

Paul October 11, 2013 at 1:35 PM

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

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Dear Sir,

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

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Dear Paul,LM324 has 4 opamps, you can use any two of them and wire them as per the given firstdiagram above....

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

naresh October 11, 2013 at 10:27 PM

hai siri can using ic 8038 it is working or not since wave genator circuit

regards

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


Dear Sir,

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

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


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

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it's nonpolar, can be any low leakage type. IRF840 is 600v rated won't be a good match with24v supplies. use irf540 instead.


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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.

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it will almost equal to 24V.

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


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

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


Sir,can 2uf electrolytic caps be used without problem?,because am having issues finding the nonpolartype.

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

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you can try polarized types also, the negative lead should go towards ground symbol


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

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Hi Paul,

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


Dear Sir,

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


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Dear Paul,

yes ceramic caps will work


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

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Dear Paul,

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

Anonymous November 7, 2013 at 11:30 PM

Dear Sir, is it possible to shift the phase so the the output from the first IC TL072 and the second are at120 degree? Iam thinking of adding a third OP AMP to get three outputs at 120 degrees shift. This willallow me to connect the three sine wave outputs to a power stage and transformer in order to get highpower three phase.

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

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Swagatam Majumdar November 8, 2013 at 10:45 AM

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

Paul November 17, 2013 at 2:22 PM

Dear Sir,

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

thank you very much sir..

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Dear Paul,

the mentioned components types are the most commonly available and standard, there noeasier replacements for these

edward December 19, 2013 at 4:15 AM

Hi sir i saw this circuit named Simple Pure Sine Wave Inverter Circuit - 500 Watt Pure Sine can thiscircuit be use for all day? my second question is can i replace 2uf with 2n2 400v ( 2.2nf,) or can use2.2/50v electrolytic cos 2uf cannot be found here i therefore cherish the hope that my question will meet


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your kind consideration and approval thank you.

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Swagatam Majumdar December 21, 2013 at 11:10 AM

Hi Edward, yes the circuit can be used for all day long if appropriate heasinking are providedto 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 inparallel for making a 2uF cap.

zinnaboy2 January 2, 2014 at 3:57 AM

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

Swagatam Majumdar January 2, 2014 at 8:37 PM

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 andis recommended for experts so please be cautioned.

zinnaboy2 January 3, 2014 at 4:12 AM

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

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you cannot use other values in place of the recommended values, so please use only what'srecommended in the diagram.

Prasad Aithal January 6, 2014 at 8:12 PM

hai sir.i want to ask two questions1)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 to12v 50 ah battery possitive?

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Hi Prasad,

Single battery will not work because the above design uses a single winding push-pullconfiguration.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.

biannz February 17, 2014 at 8:45 PM

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

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Swagatam Majumdar February 18, 2014 at 9:07 AM

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


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

biannz February 19, 2014 at 1:31 AM

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

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Swagatam Majumdar February 19, 2014 at 9:00 PM

biannz, don't try this circuit it's strictly not recommended for the newcomers, there are othersimpler versions you can try them instead


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

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

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

biannz February 20, 2014 at 9:39 PM

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

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biannz, you can use 100pf or any other close value


ok sir thank you,my question is in the first circuit TL072 should i connects the positive of the batt to pin8 of tlo72 and same to negative or it don't need any power from the batt it should build the way itpresented?thank you.

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

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


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


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anshulgarg February 22, 2014 at 1:17 PM

sir can i use only 12v battery with this circuit

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yes, you can use two 12v batteries and connect them as shown

biannz March 27, 2014 at 7:06 AM

sir thank you sir please my question is in the firs circuit you did not show the positive sign of thecapacitor i can see the 1k and the 2uf show negative so what about the tw0 cap 2uf on top of the circuitit 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 Gwill it be work? third question can you please upload the full circuit of the diagram? thank you forspending your time on us we very greateful .

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Swagatam Majumdar March 27, 2014 at 5:39 PM

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

Swagatam Majumdar March 27, 2014 at 5:40 PM

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

biannz March 28, 2014 at 3:33 AM

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

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Swagatam Majumdar March 29, 2014 at 10:27 AM

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 heatingissues, 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.

biannz April 1, 2014 at 6:29 AM

OK sir but it IRF9540N a p-channel? if it is p-channel then it should go to the positive connectionright,or no? thank you

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Swagatam Majumdar April 1, 2014 at 10:49 AM

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.


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Auwal Wali April 11, 2014 at 7:09 PM

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

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Auwal, I won't do the programming, I can try the remaining


thank you sir. i will be waiting for your feedback


please specify the things that you would need in the circuit

Auwal Wali April 17, 2014 at 4:41 AM

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

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

Auwal Wali April 26, 2014 at 12:08 AM

here is a diagram i got after a little research and i will like to replace the SG3524 with PIC16F628A orPIC16F628 and was wondering how to removing transformer 1 from the diagram.https://drive.google.com/file/d/0B6eo6OIGHPLkYlNiaXJGenBPOTg/edit?usp=sharing Thank you, will bewaiting for your feed back

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for removing T1 you may incorporate the following circuit:

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


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

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there will be modifications, but I cannot specify them


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

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yes, that may be possible.

daniel adusei June 22, 2014 at 4:54 AM

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

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Swagatam Majumdar June 22, 2014 at 10:23 PM

Daniel, the rating of the mosfets should be higher than the battery specs used for the inverter

daniel adusei June 23, 2014 at 12:08 AM

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

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which questions??

Mohamed Asrappa November 16, 2014 at 10:53 PM

Hello Sir, Which simulator software are you using. I am using proteus but I could not get sinewave.

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Hello Mohamed, confirm the upper circuit's waveform first.....it will surely show the productionof the sine waves, if correctly configured

mayokun deji July 11, 2015 at 8:52 PM

love to make dis circuit.bt sir, i have two questio1)what is theuse of the second output of d generator.i mean d opamp on the left side.2)can i just make the generator and use it wit another power stage of another inverter tell me how.because i have an inverter of 300watt but is squarewave cos it uses ne555.thank you.mayokun fromnigeria

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the green output is the sine wave output, the red one is square wave.

No, you cannot use the sine output with any inverter's power stage...that will not yieldsinewave output...that's why only the above circuit has been recommended


thanks alot for d reply

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another question is,am i to power the wave generator with a seperate 12volts battery or should i jjusttap from the 24volts and regulate with ic7812?

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no need of a separate power supply, you can extract the voltage from the inverter batteryusing a 7812 IC

mayokun deji July 14, 2015 at 2:39 AM

tnx a bunch

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harishvar akaash September 14, 2015 at 10:48 PM

WHat should be the capacity of the battery?????????does gud capacity give gud output power??

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and also i need to attach the (battery indicator circuit) and the (battery charging circuit with auto cut offfeature) and (Low power shut down) so that the battery's charge could be determined and battery couldbe charged when needed and also the battery is not overcharged.....This would present a perfectinverter with all these.....

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plzz reply faST I AM WAITING FOR YOUR REPLY

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AND ALSO SWAGATAM SIR R U SURE THAT THIS CIRCUIT WORKS?????? BECAUSE AFTERSPENDING IF IT DOESNT WORK I WOULD NOT BE ABLE TO RESIST... AND ALSO THE BATTERIESCOST A LOT..pLZZ TELL WHETHER THE CIRCUIT IS 100% WORKING OR NOT?????

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Harishvar, I am sure this circuit will work, if I were to make it, but I cannot guarantee this forothers, because it might require a thorough knowledge of all the aspects involved with thedesign to achieve success..

Moreover this kind of circuits are not for the newcomers, if you get stuck somewhere youwould be clueless regarding the solution.

for an automatic battery circuit you can prefer the second design from the following post:

http://www.homemade-circuits.com/2011/12/how-to-make-simple-low-battery-voltage.html


sir it means that i cant make this inverter right????? :-(...feeling sad


harishvar, You can begin with a simpler design as shown below, and if you succeed thenproceed step wise to upgrade it further...

http://www.homemade-circuits.com/2012/09/mini-50-watt-mosfet-inverter-circuit.html


sir why cant i make this : ( http://www.homemade-circuits.com/2013/10/pure-sine-wave-inverter-circuit-using.html ) ....... because i think 50 watt would be very less and it wont be that


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Readers are requested not to include external links while commenting. For consulting a diagram, upload it onGoogle Drive and provide the link here.

useful....i am also trying to attach a 12v car battery.....if i were to attach this battery then sirplzz give me a circuit charging car batteries......because charging car batteries would beextremely dangerous if anything wrong happens then the whole battery may explode whichwill cause a very huge damage....so plzz give me a safe circuit for charging the car batteriesand also for the(cd4047 circuit) can you give an another schematic because i cuoldnt findwhere the + and the - terminals of the battery are coming from.......i would really be thankfulto you if u give me another schematic for the cd4047 inverter circuit.....and also plzz tell thatusing a car battery would be safe or not......because i am very scared to use it.....


harishvar, if you are confident with your knowledge and skills then you can definitely goahead and try the circuit...For an automatic battery charger circuit you may build the second circuit from the followingarticle:

http://www.homemade-circuits.com/2011/12/how-to-make-simple-low-battery-voltage.html

Readers are advised to proceed with the construction of the presented circuits only afterunderstanding the concepts from the core. Not adhering to this can lead to failures andfrustrations.

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