Inverters

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

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

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

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

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

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

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

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

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

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

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

123 comments:

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

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

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

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

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

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

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    Replies
    1. Upto 30 amps...you can refer to the datasheet here:

      http://homemadecircuitsandschematics.blogspot.in/2013/01/irf540n-mosfet-specifications-datasheet.html

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

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

      Delete
  5. Hi Swagatam

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

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

    https://dl.dropboxusercontent.com/u/20969135/Sine-wave%20oscillator.gif

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    Replies
    1. Hi Abu-Hafss,

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

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

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

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

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

      Delete
  8. Hi Swagatam,I want to know that, in my home there is a pure sine wave inverter with a battery.I know how to convert 12 v DC to 230 v AC but I don't know the reverse or charging process that means 230 v AC to charge the 12 v battery.can you tell me the same MOSFET H-bridge used for charging or separate charger used when battery is drained at rated charging point.can you send me the details about it.
    email- biswajitdas49@gmail.com

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

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

      http://homemadecircuitsandschematics.blogspot.in/p/battery-chargers.html

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

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    3. Hi Biswajit,

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

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

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

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

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

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

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

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


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

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

    thank you for your time,

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

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

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

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

      Delete
  15. Hi Mr. Swagatam,

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

    thank a lot.

    Ariel.

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    Replies
    1. Hi Mr. Ariel,

      You can try the following design:

      http://homemadecircuitsandschematics.blogspot.in/2014/01/simplest-full-bridge-inverter-circuit.html

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    2. Hi Mr. Swagatam,

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

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

      Thank you for your immediate response.

      Thanks a lot

      Ariel

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    3. Hi Mr. Ariel,

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

      http://homemadecircuitsandschematics.blogspot.in/2013/04/h-bridge-inverter-circuit-using-4-n.html

      Delete
    4. Hi Mr. Swagatam,

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

      Thanks a lot Mr. Swagatam,

      Regards

      Ariel

      Delete
    5. Hi Mr. Ariel,

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

      Delete
    6. Hi Mr. Swagatam,

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

      Thanks a lot Mr. Swagatam,

      Regards

      Ariel

      Delete
    7. Hi Ariel,

      the 4049 IC will surely need 12V supply and not 48V....so you must apply the 4049 IC also with 12V from 7812 IC.

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

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

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

      Delete
    8. Hi Mr. Swagatam,

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

      Thanks a lot Mr. Swagatam

      Regards

      Ariel

      Delete
    9. Hi Ariel,

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

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

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

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

      Delete
    2. Helped me a lot,

      thanks,
      with regards.

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

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

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

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

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

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

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

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

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

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

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

    ReplyDelete
    Replies
    1. Dear Sherwin,

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

      Delete
  23. I got the UPS to look at, what I realize is that when plugged in to the ac source it delivers 117v ac to surge protection section and battery backup at 50hz, if i unplug it from the ac source and run it on batteries only I get 81v ac at 100-121hz.... I checked the batteries its 2 12v batteries in series and its giving 25v and the terminals in circuit so thats not why I am getting ow voltage and high frequency, do you know what could be giving the problem with the inverter section of that UPS

    ReplyDelete
    Replies
    1. check the current consumption without any load connected by attaching the meter probe in series with the battery positive....the meter should show negligible consumption, also check the transformer it could have got damaged or burnt internally...lastly check the battery voltage while the inverter is powered without any load, it must not show a drop in its existing voltage reading...

      if all the above are found to be correctly working then surely the issue could be in the circuit board

      Delete
  24. hi Mr. swagatam, will need your help on what component to use to produce a 2kva pure sine wave inverter because it is my final year project on school. So, i will your help on this sir.

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    Replies
    1. Hi Timilehin, you can try the following circuit, just make sure you use the right mosfets and the right transformer in terms of wattage.


      http://www.homemade-circuits.com/2015/05/simplest-pwm-modified-sine-wave.html

      Delete
  25. Hello Swagatam,

    Do you have any technology for DSp based Sine wave inverter with PWM solar charger ?

    ReplyDelete
    Replies
    1. Hello rajath, if you can provide more details regarding what DSP must include specifically then I can do some research on this...

      Delete
  26. hello sir
    i want to ask whether i can use 100AH for a UPS so that it could work for some hours

    ReplyDelete
    Replies
    1. hello timilehin, the AH level can be of any magnitude, it won't affect the inverter, whether it's 100 AH or 1000 AH it can of any value depending upon how much back you may be needing

      Delete
  27. hello sir
    i want to ask how i could use UPS circuit for inverter

    ReplyDelete
    Replies
    1. UPS is an inverter (with a built-in charger), you use it the way it is...

      Delete
  28. Hi. Thank u for an awesome web site it has really enlightened me. Please can u advise - we have two inverters which have failed not sure why. We tried the inverter on our outside lights which are 10 smd led spotlights. I have noticed that some of them have the earth wire lying unconnected. Both inverters worked the entire night then failed. Is it possible that a charge has built up and leaked into the inverters due to no earth connection on the less. Could u also advise on how the inverters should be earthed running from a desperate DB. Thank you. mitchell

    ReplyDelete
    Replies
    1. Hi Thanks, no I don't think so, the earth connection might not be the reason of the failure, it could be simply due to over heating of the inverter power devices or you might have overloaded it above its specified limits. next time make sure to add a fan cooling and see if it helps.

      Delete
  29. Thank U for the prompt reply n Greetings from South Africa. We had 10 10watt smd led spotlight running off a 2500w inverter for 2 hours off grid then remain of night it switched to on grid. It failed in the morning. Having run from 18:00 - 08:00. Think U . Best regards

    ReplyDelete
    Replies
    1. Then may be the inverter quality is not good.

      Delete
    2. Hi. I hope I haven't repeated this having prob with tablet. Does the inverter neutral output have to be bonded to earth if u r having a dedicated DB only for a few circuits? The only link between the main DB and the inverter DB is the earth.
      We r using 220v AC 50hz. Inverter is a pure sine wave. The casing has no connection for earth should we earth i
      I hope I'm making sense. Thank u

      Delete
    3. Hi, As far as I know, the earth of the inverter is just it's chassis, which has nothing to do with the neutral, by the way inverters don't have a neutral normally...both the output wires of an inverter go through an alternate phase and neutral changeovers...so there's no fixed neutral for an inverter.

      Earth is crucial for the house mains AC normally, for inverters this may not be relevant with its output mains

      Delete
    4. Hi. Is it ok for me to be on this forum as I am neither a proffesional a hobbyist? It takes me a while to figure out those stuff which is common knowledge to you guys. i tackle anything but knowledge first is prioritY to me. Thank you. Regards mitch

      Delete
    5. Hi, Anybody who is interested in electronics can join here and discuss, it's the interest and dedication that's important not the level of knowledge one may have at the start.

      Delete
  30. Thank you. So i can tie the inverter casing to the normal house earth even if there is no provision for it on the casing.(manual is 1page and no mention of earthing). Also what happens if i switch a plug off will it still be live as only one is wired to the switch.

    ReplyDelete
    Replies
    1. according to me the earth of the inverter can be connected with the house earth.

      If the plug wire is through the switch then the connection will be cut off and there will be no LIVE on the wire

      Delete
    2. Sorry I should have explained properly. The output of the inverter now goes into a mini DB where the live goes into a breaker. The neutral is tied to the neutral bar. If the inverter is alternating bet the two wires won't the "neutral" still be live even if I switch the breaker off.

      Delete
    3. Hi. Do u have any breakdown of how to intergrate the inverter supply with grid supply(not necessarily to feed into the grid). With respect to safety, wiring n equipment protection. II've done a lot of research on the topic n gained a lot of knowledge n confusion.
      Also Is it advisable to have a system where the inverter is fully powered down only comes on automatically within a time frame to provide backup power and charge the battery n switch off.
      Thank u

      Delete
    4. To prevent this you can just leave the neutral of mains unconnected to the inverter second wire....let only one of the wires of the inverter be connected with the LIVE of the house mains, that means the neutral of the house mains will act as a common neutral for both inverter and the grid mains.

      Delete
    5. .....you may refer to the following set up which shows the implementation details of an automatic grid to inverter changeover system and vice versa:

      http://www.homemade-circuits.com/2012/09/automatic-inverter-supply-and-mains.html

      Delete
    6. Hi. thank u. I need to understand this as I am led to believe that the grid n inverter power should be isolated. From each other.

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    7. Hi n Thank u. I'm a bit confused as I was under the impression that the inverter power should be fully isolated from the grid. Would connecting the neutral this way cause leakage into the surrounding grid.

      Delete
    8. my suggestion was for a GTI, if your application is not a GTI then this method will not be applicable, rather it should be implemented through a changeover relay, as described in the following article:

      http://www.homemade-circuits.com/2012/09/automatic-inverter-supply-and-mains.html

      Delete
  31. did you get the message I sent in the forum section?

    ReplyDelete
    Replies
    1. yes I saw a few pending requests in my "circuit-tutorial" forum, due to my busy schedule I am unable to attend them....please feel free to express your thoughts here...

      Delete
  32. please can i use the design of pure sine wave inverter using 4047 ic to build an inverter rating of 2kva please guide on what to do because i want to build inverter of that rating

    thanks best regards

    ReplyDelete
    Replies
    1. yes you can do it...just use the following explained stage at the output:


      http://www.homemade-circuits.com/2014/10/upgrading-low-power-inverter-to-high.html

      Delete
  33. sir in my circuit i,m having 50.79hz in both pin 10 and 11 and 101hz pin 2 of ne555, 426hz in pin 2 of ic2 and 101hz at pin 5 of ic 2

    pleas sir is 180k rsesis a pot? and which of the is responsible for the 2khz and also i use ne555 for the 3 because 7555 is not avalaible. please what could be wrong with my circuit



    sir if the 180k is a pot where did the third terminal go to?

    ReplyDelete
  34. Dear Swagatam Majumdar:

    In proteus i got two AC voltage sources and intentionally make a shift in the phase and changed the frequency of 2nd one. Now i want to synchronize the second source with the first. so, please what circuitry i use here to synchronize the second one with first. please help me... waiting for reply..
    Many thanks..

    ReplyDelete
    Replies
    1. Dear Fazli, I am sorry, I have no idea about it.

      Delete
  35. Dear Swagatam :
    Have you any other idea about synchronizing circuit for two ac sources. means to match their frequency,voltage and phase. if you have... please share with me .. i need it.

    ReplyDelete
    Replies
    1. Dar Fazli, I a sorry I do not have any idea regarding this at the moment.

      Delete
  36. sir, i designed an inverter of 3kva, but once i apply any small load. the voltages start reducing from 24ov to 50v. what will i do ?

    ReplyDelete
    Replies
    1. chuck, what is your battery and transformer and load specs...??

      Delete
  37. Hello Swagatam,
    Sorry for including the external link in my previous comment.
    I intend to build a sinosoidal PWM inverter and for that i used a simple RC phase shift oscillator producing sine wave of 50hz, then i used a 12.5Khz triangle wave as a carrier signal. Next I used a square wave (50Hz made from the sine wave) and fed both the triangle wave and square wave to a summing amplifier to produce a modified triangular waveform, next I have fed the Sine wave and the modified triangular wave into a comparator to produce a PWM signal.Next I created a HIGH & LOW PWM signal & also a HIGH & LOW Square wave signal which are going to be fed to the driver section of the Inverter.
    I am providing the Google Drive Link of the circuit.
    Kindly go through it and tell me whether the circuit is ok or not.
    I need to design a suitable Driver section of the Inverter, & in doing that I have already used 2 Nos. IR2110 MOSFET Driver and 4 nos. of IRFZ44N N- channel Mosfets, but can't get the simulation of the circuit correctly. I request you to provide me a suitable MOSFET driver circuit for the Inverter.
    Link:https://drive.google.com/open?id=0B5BqfddnRB42aG9qLWxyVEZBekk

    ReplyDelete
    Replies
    1. Hello Santanu, I don't think it needs to be so complicated.

      And I could not understand what you meant by modified triangle wave.

      If you are intending to create sine wave equivalent PWM, you can do it simply by feeding a fast sine wave and a slow sine wave to the inputs of an opamp and get the equivalent PWM at its output.

      you can refer to this article, it has everything according to your needs:

      https://www.wpi.edu/Pubs/E-project/Available/E-project-042507-092653/unrestricted/MQP_D_1_2.pdf

      Delete
  38. Hello Swagatam,
    Thanks for your reply.
    The idea of producing a spwm was taken from the link you gave.They used modified the triangular wave so that it switches between mid to high triangular wave and mid to low triangular wave.
    I specifically need a driver section for switching the pwm and square wave to produce a 3 level pwm at the output.
    One more thing, did you see the pic of the circuit diagram whose link I attached in my previous post?if not, then please see it for once because i need it to be rectified if needed.
    Please reply soon.
    Regards,
    Santanu

    ReplyDelete
    Replies
    1. Hello Santanu,

      I have seen your diagram, but I was having difficulty in simulating the stage in my mind quickly, therefore I couldn't verify it.

      Anyway, for generating a SPWM we just need a fast sine wave and a slow sine wave across an opamp input, actually these could be triangle waves also instead of sine waves, sine wave is not critically necessary. I have explained the concept here

      http://www.homemade-circuits.com/2015/07/how-to-generate-sinewave-pwm.html

      for inverting the PWMs and for creating Hi/low complementary signals you can use NOT gates....opamps are not required.

      these high low SPWM could be then applied to any full bridge driver circuit as explained:

      http://www.homemade-circuits.com/2014/01/simplest-full-bridge-inverter-circuit.html

      Delete
    2. sorry nope...for configuring PWM across the full bridge you will to wire it as indicated in this article:

      http://www.homemade-circuits.com/2016/02/pwm-sinewave-5kva-inverter-circuit.html

      Delete
    3. the hi/lo pulses should be used for driving the full bridge at 50Hz base freq....while the SPWM needs to be applied across the low side mosfets for implementing the required results.

      Delete
  39. Thanks for you reply. I will try it and let you know about the result.
    Regards,
    Santanu

    ReplyDelete
  40. Hi Swagatam,
    I am begineer in inverter design circuit and I need to design the inverter 12V DC to 30V AC (and 50V AC) with 50Hz frequency.(output is sine wave voltage 30V or 40 V or 50V depends applications)
    You have a lot of circuit design and I want to know the best approriate circuit design for me.
    Thank you .

    ReplyDelete
    Replies
    1. Hi Hachem, you can try any IC555 based boost converter design from this site or from any other sire online.....you just have to adjust the number of coil turns and/or the frequency to achieve the desired amount of boost voltage across the specified terminals.

      Delete
    2. Thank you, but I need a sine wave as output (50Khz , 50 W of power) and my question is, IC555 with coil is the best solution ? thank you

      Delete
    3. you can try a boost converter using a phase shift oscillator and then amplify the output with an emitter follower stage:

      you can easily get the above two circuit ideas online

      Delete
    4. I am also a beginner in pv inverter design. I would like to know where I can buy the PV inverter parts and if there is a design book that i can use for beginner. any information will be higly appreciated. Gil Manly, Green Bio-Solar Energy.

      Delete
    5. Please let me know if there is any reference book that i can use on PV inverter design. Also manual for beginner. There is a lot of symbols use to describe a diagram or sketch. Most of them i don't understand. Also, where do you buy the parts of the inverter. Thanks.

      Delete
    6. If you search pdf documents online you will be able to find many good inverter tutorials, however inverter being an electronic device will need a prior thorough knowledge of basic electronics without which it can be impossible to proceed with these tutprilas...the parts can be purchased from any online store, you can find plenty of them through Google search.

      Delete
  41. Hello Swagatam,
    Santanu again. As I discussed with you about the sinosoidal pwm inverter earlier. I have made the necessary modification in the circuit and got the SPWM waveform. Now I need a filter circuit to filter the sine wave from the pwm waveform. Can you guide me to design the filter circuit.
    I am uploading a pic of the PWM Waveform.

    Link : https://drive.google.com/open?id=0B5BqfddnRB42aENfYzN3Z1Rhdmc

    Regards,
    Santanu

    ReplyDelete
    Replies
    1. Hello Santanu, I don't know much about the formula for this...you may take the help of this article, where a capacitor was used for the same successfully with one of the enthusiasts:

      http://www.homemade-circuits.com/2013/10/modified-sine-wave-inverter-circuit.html

      Delete
  42. Hello Swagatam,
    Got the output corrected by adding a LC filter circuit,thanks. Now I need to know that can I use a normal 0-12v transformer for the inverter portion as well as for the battery charger circuit. The transformer I will be using is not a Centre tap one.

    Regards,
    Santanu

    ReplyDelete
    Replies
    1. Hello Santanu, sorry I did not understand your question, you must have already connected the LC filter to your transformer output right? so which inverter transformer are you referring to?

      for the battery charger you can use any transformer that may be rated appropriately as per the battery AH and voltage specifications

      Delete
    2. Hello swagatam,
      Sorry my mistake. As I have used the LC filter at the output of the transformer I cant use the same transformer as a battery charger.
      Regards,
      Santanu

      Delete
    3. OK in that case you will have to use a separate transformer, appropriately rated transformer for charging the battery, and anyway you cannot use the inverter trafo for charging the battery...it's not possible

      Delete
  43. Hello Swagatam,
    I am referring to the transformer to which I have connected the LC filter.

    ReplyDelete
    Replies
    1. Hello Santanu, the transformer rating will depnd on the load specifications, the trafo wattage should match the load specs.

      Delete
  44. Hello Mr. Swagatam,‎
    Please accept all respect.‎
    In my car, I am using loud speakers of 120W each.‎
    But the radio output is still so weak.‎
    I built an audio amplifier circuit following a diagram described on-line based on a TDA7560 IC ‎to get 4-channel 55W output but it never worked properly.‎
    Now I bought a 2-channel 100w amplifier circuit but it needs an 18-24 volt AC power ‎supply.‎
    I thought of making a circuit to invert my car’s 12V DC (60A) to a 24V AC to power this ‎amplifier circuit.‎
    Can this be done?‎
    And if so, could the proposed inverter support this kind of amplifier to generate a sum of 200W power?‎
    Would you please show me how to design a suitable circuit for this purpose?‎
    Much thanks

    ReplyDelete
    Replies
    1. Hello Ashee, you can try the following concept and see if it works correctly or not because it might require some serious modifications as per the current requirement of your application:

      http://www.homemade-circuits.com/2014/11/12v-car-laptop-charger-circuit-using.html

      alternatively you can simply buy another 12V battery and use it in series with the existing one for getting a clean and a powerful 24V output

      Delete
  45. Dear Swagatam,
    Thank you very much for the soon response and you advices and diagrams.
    But I am afraid that my amplifier needs an AC power supply
    and it is not clear to me if this design provides an AC or a DC power.
    In addition, your proposal of adding another 12v battery to have clean 24v output goes the same way of DC that is not usable by this amplifier circuit.
    So, if you think the DC would be OK as well, I will start performing the proposed design
    for the inverter soon.
    Thank you again and forgive my urgency.

    ReplyDelete
    Replies
    1. Hi Ashee,

      do you mean to say 24V AC? that's strange and not possible...it has to be 24VDC input or alternatively a 220V AC.

      I would recommend you to try with two 12V batts in series first and confirm the results

      Delete

Swagatam Majumdar
Swagatam MajumdarHi Friends, Welcome to my site, a place where you will discover a massive collection of electronic circuit ideas, mostly requested by the dedicated readers and exclusively designed by me for their customized application needs. I have posted more than 1100 circuit designs in this site, if you have a personalized circuit requirement you may feel free to request it through the comment box, if it seems feasible to me then surely you may find it published here with your credentials attached in the post, thanks and please keep reading



 
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