This inverter will sufficiently power any of your 115VAC (or 220VAC)small appliances. T1 choice of amperage is yours to make, but if you can salvage a heavy-duty unit from somewhere, use it.
The least expensive method to get a larger transformer would be to remove the old 2000v primary and then re-wind an old microwave transformer. Most of these transformers are rated 1KW or better.
Your local TV or Electronics repair shop may have one or dig one up from the dumpster. Just in case you don’t know, micro-wave transformers can keep their charge (via the connected electronics) for a long time, so be careful! R1 and
R2 are 10 ohm, wire-wound, and at least 5 watts.
Wattage/cooling should be increased accordingly if you decide to beef up the output. For D1 and D2 you can use any power diode like the 1N4002 to 1N4005. If you live in Europe, Australia, or any other country with a 220VAC system, the only different is the transformer. This particular circuit can be constructed to handle up to 1 KiloWatt (1000 watt). If there is enough interest, I can modify this circuit to include a crow-bar circuit, battery backup, or more output in watts, or everything.
The power output is determined by transformer T1, and power transistors Q1 & Q2. Assume a transformer of about 15A and the chosen transistors of 2N3055 (15A) type, the inverter can supply about 300 watts with the parts shown. If you are good with electronics all you have to do is replace the 2N3055’s and T1 accordingly for more output. It is imperative to mount Q1 and Q2 on large coolribs. If you intend to beef everything up with a couple kilowatts a standard (5″) cooling fan will also be required. If this is the case, the 2N3771 power transistor is a good choice at 30Amps.
NTE’s replacement, NTE181, is an improved version of the 2N3771 and carries 90volts instead of the 40 volts and can dissipate 200W instead of 2N3771’s 150W. It is mandatory to include at least one suitable fuse and enclose this project in the correct casing. To be really safe you may want to include a primary and secundary fuse for your own protection. You are dealing with 120VAC or 220VAC at respectible amperage so be careful. The powercord also needs to be secured to prevent accidents.
The 68uF Tantalum capacitors were chosen for their endurance. Normal electrolytic capacitors would overheat and explode. Somesort of cooling fan inside the project case may be a good choice, I myself use a ball-bearing cpu-fan from an old computer. New they don’t cost that much either, about 3 bucks or so.
Since T1, and Q1/Q2 are NOT part of the PCB, these few parts can easily be used on a piece of Vero or experimenters board. Radio Shack and Tandy have these boards also available at a very reasonable price (in Canada $3.50). The receptacle(s) on T1’s output will be part of the case (obviously). I Just a small note about the 12 Volt battery, this circuit and others similar can draw huge amounts of current and will drain your battery in hurry so don’t let your battery go dead! That’s why a wind/solar power combination would be an excellent future addition. For those interested in a PCB, I have included one below with a layout. As soon as I get my digital camera I will include pictures of the finished project
31 Responses
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Excellent design.
Suresh de Fonseka
please, what are the values for R3 andR4?
Can I use this one?: LOW POWER, 117V, 50/60HZ, 24.0VCT@4.000Amp, LEADS
your site very very good.good luck
thanks for your site.mersi
Please , in the 1000w inverter-circuit,what the values for R3 AND R4?
please can i get the complete ciruit of 1000W inverter, pls help me tosend it to my Email box
Please can i get the 1000W inverter circuit diagram.please post
to my mail : kali_dhk@yahoo.com
pleas. i need different circuit diagrams .
Is the wattage of the inverter circuit dependent on the transformer rating?
-ian2_santiago@yahoo.com
IT IS A NICE CIRCUIT, BUT YOU DID NOT INDICATE THE VA LIVES OF R3 AND R4, PLEASE CAN YOU SEND IT VIA MY E-MAIL I WILL BE GRATFULL.
Please send me the 1000W inverter circuit diagram to my mail : gerard11@rediffmail.com
can i get 1000w audio power amplifier circuit diagram i would be grateful thanks send through my email Kalu.Ibiam@yahoo.com
Please send me the 1000W inverter circuit diagram to my mail : den_non_45@hotmail.com
an please include the value of all the components
I like Ur work, its great. pls can i get a complete circuit of 1kw inverter wth battery backup that can stand up to 8hrs after power outage. pls send it to my inbox. I’ll be very grateful. Thank you.
please i need a workable circuit of 1000w power inverter circuit.
i will be very happy if you can send it to my email box: ajaxman79@yahoo.com.
Please can i get the 1000W – 3000w inverter circuit diagram.
please post to my mail : sml_ssnynj@yahoo.com
What a wonderful design, please kindly get me 1000w-2000w 12vdc-220vac power inverter circiut diagram with values of all components. Please post to my email box . Thanks
Pls your work is splendid. But sir do me a favour, i’ll like you to send me a 5000w inverter circuit diagram thanks in anticipation. My mail sanibest95@yahoo.com
Dear
i am intrusted in these type of circuit. so pls send me on my email a 5000watt ac to dc and dc to ac combi inverter circuit diagram, Layout diagram etc. for homely used. And full material detail for assemble of this system. Thanks a lot.
Eu sou do Brasil.
R3, R4 ——– 180 Ohm, 1 Watt Resistor
je vous remercie pour les projets & bon courage
great design..but some parts are luck of values
can some one tell me to run 150watt load with this what should be the ampere value for T1. If some one know then email me on hk200204@gmail.com PLZZzzzzzzzz
its a very good sight
thanks
Its a very good design but kindly give us an additional circuit to regulate the output to 120v or 220v and to maintain the hz 50 or 60 so that we can prolong the discharge of power source (battery).
plz send 500w or 1000w working inverter circuit diagram…… with parts list….
please send me a diagram with parts list to handle 16kW out put to prestedge1955@gmail.com
Dear Friend
Hi
Its an excellent circuit. You the man. Hey my friend we will be highly great full if you please send us parts list OR publish with the same place with the same circuit for the students.
Your positive response will be appreciated.
Thanks and With Best Regards
J.K