Making a power inverter circuit rated above 2000 VA is always difficult, mainly because of the involved transformer dimension which becomes quite huge, unmanageable and difficult to configure correctly.
Introduction
Power inverters in the range of KVA, requires huge current transferring capabilities for implementing the required operations as per the desired specs of the unit.
Transformer being the main power making component of such an inverter, requires high current handling secondary winding if the used battery voltage is at the lower side, for example 12 or 24 volts.
In order to optimize the transformer at lower currents, the voltage needs to be pushed at higher levels which again becomes a problematic issue, because higher voltage means putting batteries in series.
The above problems can definitely demoralize any new electronic hobbyists or anybody who might be planning to make a rather big inverter design, may be for controlling the whole house electrical.
An innovative approach for make things simpler even with huge power inverter designs has been discussed in this article which uses smaller discrete transformers with individual drivers for implementing a 2000 VA inverter circuit.
How it Works
Let's study the circuit diagram and it's operations with the following points:
Basically the idea is to divide the power into many different smaller transformers whose outputs can be fed to individual sockets for operating the relevant electrical appliances.
This method helps us to avoid the need of hefty and complicated transformers, and the proposed design becomes feasible even for an electronic novice to understand and construct.
Four IC4049s have been employed in this design. A single 4049 consists of 6 NOT gates or inverters, so in all 24 of them have been used here.
Two of gates are wired up for generating the basic required square wave pulses and the rest of the gates are simply held as buffers for driving the next relevant stages.
Each transformer utilizes a couple of gates and the respective high current Darlington transistors which function as the driver transistors. The associated gates conduct alternately and drive the transistors in accordance.
The mosfets which are connected to the driver transistors respond to the above high current signals and start pumping the battery voltage directly into the winding of the respective transformers.
Due to this an induced high voltage AC starts flowing through the complementary output winding of all the involved transformers, generating the required AC 220 V or 120 V at the respective outputs.
These voltage become available in small pockets, so only the relevant magnitude of power can be expected from each of the transformers.
The 555 section takes care of the square wave output generated from the oscillator stage such that these are broken into sections and optimized for replicating a modified sine wave output.
All the parts after POINT X should be repeated for acquiring discrete power output sections, the common input of all these stages must be joined to POINT X.
Each of the transformer may be rated at 200 VA, so together, 11 stages (after pointX) would provide roughly outputs up to 2000 VA.
Though using many transformers instead of a single might look like a small drawback, the actual need of deriving 2000 VA using ordinary parts and concepts finally becomes achievable from the above design very easily.
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Chinomso says
I need your help on this sir,. I built a 2000w inverter circuit with 12 irf3502 mosfets, 6 of them on either side, and transistor tip41 as the driver of the irf3502 mosfets and ic sg3524 as the driving ic. Each time I turn on the circuit, it would work for seconds with strong heating effect on the mosfets, and would destroy one of the tip41 transistors. However, I did not connect protective diode. Is there any need for protective diodes on the output of the mosfets as it could be the course of the transistor destruction?
Swag says
Chinomso, first of all TIP41 is not required for driving mofests. You can do it with much smaller transistors, however in your circuit the TIP could have got burnt wrong connections of the TIP, and not because of the reverse diode on the mosfets. Having said that, reverse diode are necessary and you should connect them across the mosfets channels or across the respective trafo winding
Chinomso says
Can a 2000watts voltage regulator (stabilizer) transformer be used as power transformer for the 2000watts inverter circuit?. If yes, please can you suggets the winding procedure, which would include: the wire guages and the number of wire turns for both the primary and secondary side. Thanks
Swag says
sorry I do not know how to modify a stabilizer transformer into an inverter transformer, a professional trafo designer will know that better.
Ed De says
Can the output of all the transformers be connected in paralell?
Swagatam says
No…
Puneet Sharma says
sir it means that 11 transformers will be required and 3 ic 4049 i think repeating your 1 kva is better whats your view
Swagatam says
Puneet, the above circuit could be lengthy but will give no troubles while building and testing
saurabh nimavat says
Please send all part list
Swagatam says
click the diagram, it's given in the diagram itself.
saurabh nimavat says
Please send part list
ABRAHAM ONOSAKPONOME says
sir i have a transformer that was use for 1500w ups, the primary has 4tap and secondary has 2tap will it be aplicable for this circuit, please respond to southern.tech59@gmail.com
Swagatam says
Abraham,
You can try this one instead, it's much simpler and reliable.:
1.bp.blogspot.com/-z9RRPSTi8zs/UbR4uKyuLRI/AAAAAAAAESo/rGu-sAhOqio/s1600/IC%204047%20inverter%20circuit.jpg
Anonymous says
Dear sir
I want a charging lite I have 3w led 30 at 6 v 4.5amp dc with good britnece so if you any circuits schematic so give me I will wait
Swagatam says
30nos 3 watt leds will not work with 6v/4.5ah batt
Abdul Lukman says
hello sir, kindly send me your contact, so that we can talk biz
Swagatam says
Please contact me on my email ID, it's given in "contacts"
Abdul Lukman says
hello sir, am an electrical student. my project is to build a 2000va,24v inverter.
i have searched the internet but couldnt get how to go about it. pls help me sir.
writing a good proposal is another challenge pls. i have not bought any material
Abdul Lukman says
hello sir, am an student. my project is to build a simple inverter. 2000va,24v.
please help me sir. i need to know how to go about it sir.
i want to know d materials (components) to buy. please help me sir. thank u
Swagatam says
Hello Abdul,
Making an inverter rated as high as 2000VA is not easy unless you are an expert in electronics. I have published many designs of smaller versions, you can try any one these ans upgrade it to higher levels step wise:
https://homemade-circuits.com/p/sine-wave-inverters.html
Anonymous says
i want to build the inverter for my home. so how can i do it.pls reply sir
thanks
Swagatam says
are you well versed with electronic basics? otherwise you shouldn't attempt.
avijeet agrawal says
thanks sir.
avijeet agrawal says
hello sir ,
thanks for your quick reply
i had made the changes and now it is better than before. since i had no 9-0-9 so i m not getting the out put near 220v.
–>by the way u had suggested 9-0-9 for step down trafo or it is also suggested for step up trafo for getting high output.
->one more thing can back emf of trafo through +ve rail gives any harm on ic.
thanks for ur great circuits and ur valuable help
Swagatam says
9-0-9 is the mosfet side winding and 220V is the output winding of the transformer, you may use any ordinary 9-0-9/5amp transformer for this.
emf will not have any effect on the IC.
avijeet agrawal says
hello sir,
how r u.thanks for giving us ur valuable time
sir i am trying to make ur above stated circuit but i m not getting the desired output. i had made the circuit exactly u had described.for testing purpose i had used 12-0-12 5v step down (reversed) trafo. but it is giving 180v output with a humming sound and my mosfet are getting extemlly hot within 10sec. battery i had used is 12v 9.4ah.
it has taken the life of one of my 4049ic. the same trafo is giving the good out put with ur suggested 50w simple inverter circuit. please help me to get out of this problem.
thanks for ur kind support
Swagatam says
Helo Avijeet,
connect the mosfet gates directly with the IC gates via 1K resistors, don't use the transistors.
For getting higher voltages use 9-0-9V transformer.
Swagatam says
Not sure why….without seeing the circuit diagram it will be difficult to troubleshoot.
Anonymous says
swagatam,
why is my 2000VA automatic voltage regulator not producing output voltage and why is it burning the 35v 1000uf capacitor.also i noticed humming on the transformer.i need to know the causes and the solutions
thanks.
stintex2001@yahoo.com
Anonymous says
i don't understand the transformer part..pls explain
Anonymous says
what do purple triangle symbolize?