Thursday, May 24, 2012

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

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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 = 60-0-60V/1000 watts/output 110/220volts 50Hz/60Hz
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30 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

  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

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